Repository: wardviaene/golang-for-devops-course Branch: main Commit: 848688cc05bd Files: 194 Total size: 415.0 KB Directory structure: gitextract_4f9vk1pn/ ├── .github/ │ └── workflows/ │ └── verify-build.yml ├── .gitignore ├── README.md ├── aws-ec2/ │ ├── .gitignore │ ├── go.mod │ ├── go.sum │ └── main.go ├── aws-s3/ │ ├── go.mod │ ├── go.sum │ └── main.go ├── aws-s3-testing/ │ ├── go.mod │ ├── go.sum │ ├── main.go │ ├── main_test.go │ └── testdata/ │ └── test.txt ├── azure-instance/ │ ├── .gitignore │ ├── go.mod │ ├── go.sum │ └── main.go ├── dns-demo/ │ ├── cmd/ │ │ └── dns-resolver/ │ │ └── main.go │ ├── go.mod │ ├── go.sum │ └── pkg/ │ └── dns/ │ ├── resolver.go │ └── resolver_test.go ├── dns-start/ │ ├── cmd/ │ │ └── dns-resolver/ │ │ └── main.go │ ├── go.mod │ ├── go.sum │ └── pkg/ │ └── dns/ │ ├── resolver.go │ └── resolver_test.go ├── go.work ├── go.work.sum ├── hello-world/ │ ├── go.mod │ └── main.go ├── hello-world-arguments/ │ ├── go.mod │ └── main.go ├── http-get/ │ ├── go.mod │ └── main.go ├── http-get-errorhandling/ │ ├── error.go │ ├── go.mod │ └── main.go ├── http-get-flags/ │ ├── error.go │ ├── go.mod │ └── main.go ├── http-get-functions/ │ ├── go.mod │ └── main.go ├── http-get-json/ │ ├── go.mod │ └── main.go ├── http-get-json-map/ │ ├── go.mod │ └── main.go ├── http-login/ │ ├── error.go │ ├── go.mod │ ├── login.go │ ├── main.go │ └── transport.go ├── http-login-packaged/ │ ├── cmd/ │ │ └── http-login/ │ │ └── main.go │ ├── go.mod │ └── pkg/ │ └── api/ │ ├── error.go │ ├── get.go │ ├── init.go │ ├── login.go │ └── transport.go ├── http-login-tests/ │ ├── cmd/ │ │ └── http-login/ │ │ └── main.go │ ├── go.mod │ └── pkg/ │ └── api/ │ ├── error.go │ ├── get.go │ ├── get_test.go │ ├── init.go │ ├── login.go │ ├── transport.go │ └── transport_test.go ├── kubernetes-deploy/ │ ├── app.yaml │ ├── go.mod │ ├── go.sum │ └── main.go ├── kubernetes-deploy-github/ │ ├── .dockerignore │ ├── Dockerfile │ ├── README.md │ ├── deploy.yaml │ ├── go.mod │ ├── go.sum │ ├── main.go │ ├── server.go │ └── server_test.go ├── mutex-demo/ │ ├── go.mod │ └── main.go ├── oidc-demo/ │ ├── .gitignore │ ├── Dockerfile │ ├── cmd/ │ │ ├── appserver/ │ │ │ ├── jwt.go │ │ │ ├── jwt_test.go │ │ │ └── main.go │ │ └── server/ │ │ └── main.go │ ├── config.yaml │ ├── go.mod │ ├── go.sum │ └── pkg/ │ ├── oidc/ │ │ ├── discovery.go │ │ ├── rand.go │ │ └── types.go │ ├── server/ │ │ ├── authorization.go │ │ ├── authorization_test.go │ │ ├── config.go │ │ ├── discovery.go │ │ ├── http.go │ │ ├── http_test.go │ │ ├── jwks.go │ │ ├── login.go │ │ ├── login_test.go │ │ ├── templates/ │ │ │ └── login.html │ │ ├── token.go │ │ ├── token_test.go │ │ ├── types.go │ │ ├── userinfo.go │ │ └── userinfo_test.go │ └── users/ │ └── auth.go ├── oidc-start/ │ ├── .gitignore │ ├── cmd/ │ │ ├── appserver/ │ │ │ ├── jwt.go │ │ │ ├── jwt_test.go │ │ │ └── main.go │ │ └── server/ │ │ └── main.go │ ├── go.mod │ ├── go.sum │ └── pkg/ │ ├── oidc/ │ │ ├── discovery.go │ │ ├── rand.go │ │ └── types.go │ ├── server/ │ │ ├── authorization.go │ │ ├── authorization_test.go │ │ ├── config.go │ │ ├── config_test.go │ │ ├── discovery.go │ │ ├── http.go │ │ ├── http_test.go │ │ ├── jwks.go │ │ ├── login.go │ │ ├── login_test.go │ │ ├── templates/ │ │ │ └── login.html │ │ ├── token.go │ │ ├── token_test.go │ │ ├── types.go │ │ ├── userinfo.go │ │ └── userinfo_test.go │ └── users/ │ └── auth.go ├── reader-example/ │ ├── go.mod │ └── main.go ├── slices-demo/ │ ├── cmd/ │ │ └── array-and-slice/ │ │ └── main.go │ └── go.mod ├── ssh-demo/ │ ├── .gitignore │ ├── cmd/ │ │ ├── client/ │ │ │ └── main.go │ │ ├── keygen/ │ │ │ └── main.go │ │ └── server/ │ │ └── main.go │ ├── go.mod │ ├── go.sum │ ├── keygen.go │ └── server.go ├── test-server/ │ ├── Dockerfile │ ├── Dockerfile.scratch │ ├── README.md │ ├── assignment1.go │ ├── go.mod │ ├── go.sum │ ├── main.go │ ├── ratelimit.go │ └── start-test-server.sh ├── tls-demo/ │ ├── .gitignore │ ├── cmd/ │ │ ├── letsencrypt-server/ │ │ │ └── main.go │ │ ├── mtls-client/ │ │ │ └── main.go │ │ ├── mtls-server/ │ │ │ └── main.go │ │ ├── test-server/ │ │ │ └── main.go │ │ └── tls/ │ │ └── main.go │ ├── go.mod │ ├── go.sum │ ├── pkg/ │ │ ├── cert/ │ │ │ ├── pem.go │ │ │ ├── types.go │ │ │ └── x509.go │ │ ├── cmd/ │ │ │ ├── ca.go │ │ │ ├── cert.go │ │ │ ├── create.go │ │ │ ├── key.go │ │ │ └── root.go │ │ └── key/ │ │ └── rsa.go │ └── tls.yaml ├── tls-start/ │ ├── .gitignore │ ├── cmd/ │ │ ├── test-server/ │ │ │ └── main.go │ │ └── tls/ │ │ └── main.go │ ├── go.mod │ ├── go.sum │ ├── pkg/ │ │ ├── cert/ │ │ │ ├── pem.go │ │ │ ├── types.go │ │ │ └── x509.go │ │ ├── cmd/ │ │ │ └── root.go │ │ └── key/ │ │ └── rsa.go │ └── tls.yaml └── types-demo/ ├── cmd/ │ ├── generics/ │ │ └── main.go │ ├── json-parsing/ │ │ └── main.go │ └── type-switch/ │ └── main.go └── go.mod ================================================ FILE CONTENTS ================================================ ================================================ FILE: .github/workflows/verify-build.yml ================================================ name: Verify Go Modules Build permissions: contents: read on: push: pull_request: workflow_dispatch: jobs: build: runs-on: ubuntu-latest steps: - name: Checkout code uses: actions/checkout@v4 - name: Set up Go uses: actions/setup-go@v5 with: go-version-file: 'go.work' # uses version from go.work cache: true - name: Verify each module compiles run: | set -e # Extract module directories (lines starting with ./) MODULES=$(grep '^\s*\./' go.work | tr -d '()') echo "Found modules:" echo "$MODULES" # Loop through each and run `go test ./...` for dir in $MODULES; do echo "module: $dir" cd "$dir" go vet ./... cd - >/dev/null done ================================================ FILE: .gitignore ================================================ .DS_Store ================================================ FILE: README.md ================================================ # golang-for-devops-course Course material for [Golang For DevOps And Cloud Engineers](https://www.udemy.com/course/golang-for-devops-and-cloud-engineers/?referralCode=5A05F011338E0C54EAE7) ================================================ FILE: aws-ec2/.gitignore ================================================ go-aws-ec2.pem ================================================ FILE: aws-ec2/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/aws-ec2 go 1.25.4 require github.com/aws/aws-sdk-go-v2/config v1.15.8 require ( github.com/aws/aws-sdk-go-v2 v1.16.4 // indirect github.com/aws/aws-sdk-go-v2/credentials v1.12.3 // indirect github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5 // indirect github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11 // indirect github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5 // indirect github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12 // indirect github.com/aws/aws-sdk-go-v2/service/ec2 v1.44.0 // indirect github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5 // indirect github.com/aws/aws-sdk-go-v2/service/sso v1.11.6 // indirect github.com/aws/aws-sdk-go-v2/service/sts v1.16.6 // indirect github.com/aws/smithy-go v1.11.2 // indirect github.com/jmespath/go-jmespath v0.4.0 // indirect ) ================================================ FILE: aws-ec2/go.sum ================================================ github.com/aws/aws-sdk-go-v2 v1.16.4 h1:swQTEQUyJF/UkEA94/Ga55miiKFoXmm/Zd67XHgmjSg= github.com/aws/aws-sdk-go-v2 v1.16.4/go.mod h1:ytwTPBG6fXTZLxxeeCCWj2/EMYp/xDUgX+OET6TLNNU= github.com/aws/aws-sdk-go-v2/config v1.15.8 h1:Mk9aPT1JiPkhZO9PIP1w2ramuRw95d9w5YNOM3poTKk= github.com/aws/aws-sdk-go-v2/config v1.15.8/go.mod h1:Z/guryqWzLw1T3pJbFA0/V3aVXw0sX5oH4lXXiD67aY= github.com/aws/aws-sdk-go-v2/credentials v1.12.3 h1:1kPx2lGjvopx7IMqKFmqmhqcuDZQ7pvq9xNXPP5c6qo= github.com/aws/aws-sdk-go-v2/credentials v1.12.3/go.mod h1:p6/NGiaGKKM3ihOt/W08Ikz7/F95WhvgjA4x6MWKdS8= github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5 h1:YPxclBeE07HsLQE8vtjC8T2emcTjM9nzqsnDi2fv5UM= github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5/go.mod h1:WAPnuhG5IQ/i6DETFl5NmX3kKqCzw7aau9NHAGcm4QE= github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11 h1:gsqHplNh1DaQunEKZISK56wlpbCg0yKxNVvGWCFuF1k= github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11/go.mod h1:tmUB6jakq5DFNcXsXOA/ZQ7/C8VnSKYkx58OI7Fh79g= github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5 h1:PLFj+M2PgIDHG//hw3T0O0KLI4itVtAjtxrZx4AHPLg= github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5/go.mod h1:fV1AaS2gFc1tM0RCb015FJ0pvWVUfJZANzjwoO4YakM= github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12 h1:j0VqrjtgsY1Bx27tD0ysay36/K4kFMWRp9K3ieO9nLU= github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12/go.mod h1:00c7+ALdPh4YeEUPXJzyU0Yy01nPGOq2+9rUaz05z9g= github.com/aws/aws-sdk-go-v2/service/ec2 v1.44.0 h1:ZuDiiY51GwGqYZ3NVMhRxqyolRy2JN4RGE1ERZ+GdyU= github.com/aws/aws-sdk-go-v2/service/ec2 v1.44.0/go.mod h1:b2SVOmsP7A9VlTpfkJAVbU3d+TQfD76x9IUNbvynAbM= github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5 h1:gRW1ZisKc93EWEORNJRvy/ZydF3o6xLSveJHdi1Oa0U= github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5/go.mod h1:ZbkttHXaVn3bBo/wpJbQGiiIWR90eTBUVBrEHUEQlho= github.com/aws/aws-sdk-go-v2/service/sso v1.11.6 h1:AnTIdD439WgYNyVldYlpccGWY2EIXoUNmVzTDbFqCsg= github.com/aws/aws-sdk-go-v2/service/sso v1.11.6/go.mod h1:TFVe6Rr2joVLsYQ1ABACXgOC6lXip/qpX2x5jWg/A9w= github.com/aws/aws-sdk-go-v2/service/sts v1.16.6 h1:aYToU0/iazkMY67/BYLt3r6/LT/mUtarLAF5mGof1Kg= github.com/aws/aws-sdk-go-v2/service/sts v1.16.6/go.mod h1:rP1rEOKAGZoXp4iGDxSXFvODAtXpm34Egf0lL0eshaQ= github.com/aws/smithy-go v1.11.2 h1:eG/N+CcUMAvsdffgMvjMKwfyDzIkjM6pfxMJ8Mzc6mE= github.com/aws/smithy-go v1.11.2/go.mod h1:3xHYmszWVx2c0kIwQeEVf9uSm4fYZt67FBJnwub1bgM= github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o= github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE= github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg= github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo= github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8= github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4= golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10= gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= ================================================ FILE: aws-ec2/main.go ================================================ package main import ( "context" "fmt" "os" "strings" "github.com/aws/aws-sdk-go-v2/aws" "github.com/aws/aws-sdk-go-v2/config" "github.com/aws/aws-sdk-go-v2/service/ec2" "github.com/aws/aws-sdk-go-v2/service/ec2/types" ) func main() { var ( instanceId string err error ) if instanceId, err = createEC2(context.Background(), "us-east-1"); err != nil { fmt.Printf("Error: %s", err) os.Exit(1) } fmt.Printf("instance id: %s\n", instanceId) } func createEC2(ctx context.Context, region string) (string, error) { cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion(region)) if err != nil { return "", fmt.Errorf("LoadDefaultConfig error: %s", err) } ec2Client := ec2.NewFromConfig(cfg) existingKeyPairs, err := ec2Client.DescribeKeyPairs(ctx, &ec2.DescribeKeyPairsInput{ KeyNames: []string{"go-aws-ec2"}, // or: //Filters: []types.Filter{ // { // Name: aws.String("key-name"), // Values: []string{"go-aws-ec2"}, // }, //}, }) if err != nil && !strings.Contains(err.Error(), "InvalidKeyPair.NotFound") { return "", fmt.Errorf("DescribeKeyPairs error: %s", err) } if existingKeyPairs == nil || len(existingKeyPairs.KeyPairs) == 0 { keyPair, err := ec2Client.CreateKeyPair(ctx, &ec2.CreateKeyPairInput{ KeyName: aws.String("go-aws-ec2"), }) if err != nil { return "", fmt.Errorf("CreateKeyPair error: %s", err) } err = os.WriteFile("go-aws-ec2.pem", []byte(*keyPair.KeyMaterial), 0600) if err != nil { return "", fmt.Errorf("WriteFile (keypair) error: %s", err) } } describeImages, err := ec2Client.DescribeImages(ctx, &ec2.DescribeImagesInput{ Filters: []types.Filter{ { Name: aws.String("name"), Values: []string{"ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-*"}, }, { Name: aws.String("virtualization-type"), Values: []string{"hvm"}, }, }, Owners: []string{"099720109477"}, // see https://ubuntu.com/server/docs/cloud-images/amazon-ec2 }) if err != nil { return "", fmt.Errorf("DescribeImages error: %s", err) } if len(describeImages.Images) == 0 { return "", fmt.Errorf("describeImages has empty length (%d)", len(describeImages.Images)) } runInstance, err := ec2Client.RunInstances(ctx, &ec2.RunInstancesInput{ ImageId: describeImages.Images[0].ImageId, InstanceType: types.InstanceTypeT3Micro, KeyName: aws.String("go-aws-ec2"), MinCount: aws.Int32(1), MaxCount: aws.Int32(1), }) if err != nil { return "", fmt.Errorf("RunInstance error: %s", err) } if len(runInstance.Instances) == 0 { return "", fmt.Errorf("RunInstance has empty length (%d)", len(runInstance.Instances)) } return *runInstance.Instances[0].InstanceId, nil } ================================================ FILE: aws-s3/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/aws-s3 go 1.25.4 require ( github.com/aws/aws-sdk-go-v2 v1.16.4 github.com/aws/aws-sdk-go-v2/config v1.15.8 github.com/aws/aws-sdk-go-v2/service/s3 v1.26.10 ) require github.com/jmespath/go-jmespath v0.4.0 // indirect require ( github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.1 // indirect github.com/aws/aws-sdk-go-v2/credentials v1.12.3 // indirect github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5 // indirect github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.13 github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11 // indirect github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5 // indirect github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12 // indirect github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.2 // indirect github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.1 // indirect github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.6 // indirect github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5 // indirect github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.5 // indirect github.com/aws/aws-sdk-go-v2/service/sso v1.11.6 // indirect github.com/aws/aws-sdk-go-v2/service/sts v1.16.6 // indirect github.com/aws/smithy-go v1.11.2 // indirect ) ================================================ FILE: aws-s3/go.sum ================================================ github.com/aws/aws-sdk-go-v2 v1.16.4 h1:swQTEQUyJF/UkEA94/Ga55miiKFoXmm/Zd67XHgmjSg= github.com/aws/aws-sdk-go-v2 v1.16.4/go.mod h1:ytwTPBG6fXTZLxxeeCCWj2/EMYp/xDUgX+OET6TLNNU= github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.1 h1:SdK4Ppk5IzLs64ZMvr6MrSficMtjY2oS0WOORXTlxwU= github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.1/go.mod h1:n8Bs1ElDD2wJ9kCRTczA83gYbBmjSwZp3umc6zF4EeM= github.com/aws/aws-sdk-go-v2/config v1.15.8 h1:Mk9aPT1JiPkhZO9PIP1w2ramuRw95d9w5YNOM3poTKk= github.com/aws/aws-sdk-go-v2/config v1.15.8/go.mod h1:Z/guryqWzLw1T3pJbFA0/V3aVXw0sX5oH4lXXiD67aY= github.com/aws/aws-sdk-go-v2/credentials v1.12.3 h1:1kPx2lGjvopx7IMqKFmqmhqcuDZQ7pvq9xNXPP5c6qo= github.com/aws/aws-sdk-go-v2/credentials v1.12.3/go.mod h1:p6/NGiaGKKM3ihOt/W08Ikz7/F95WhvgjA4x6MWKdS8= github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5 h1:YPxclBeE07HsLQE8vtjC8T2emcTjM9nzqsnDi2fv5UM= github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5/go.mod h1:WAPnuhG5IQ/i6DETFl5NmX3kKqCzw7aau9NHAGcm4QE= github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.13 h1:bDtJV1rjBZNU3YWTptrUxBvl9URGXadCeYXb1uA166M= github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.13/go.mod h1:Dzx6Ckq2RPPa8VgvmxZyszhRVXXHeskGRBdr5myunJ0= github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11 h1:gsqHplNh1DaQunEKZISK56wlpbCg0yKxNVvGWCFuF1k= github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11/go.mod h1:tmUB6jakq5DFNcXsXOA/ZQ7/C8VnSKYkx58OI7Fh79g= github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5 h1:PLFj+M2PgIDHG//hw3T0O0KLI4itVtAjtxrZx4AHPLg= github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5/go.mod h1:fV1AaS2gFc1tM0RCb015FJ0pvWVUfJZANzjwoO4YakM= github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12 h1:j0VqrjtgsY1Bx27tD0ysay36/K4kFMWRp9K3ieO9nLU= github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12/go.mod h1:00c7+ALdPh4YeEUPXJzyU0Yy01nPGOq2+9rUaz05z9g= github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.2 h1:1fs9WkbFcMawQjxEI0B5L0SqvBhJZebxWM6Z3x/qHWY= github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.2/go.mod h1:0jDVeWUFPbI3sOfsXXAsIdiawXcn7VBLx/IlFVTRP64= github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.1 h1:T4pFel53bkHjL2mMo+4DKE6r6AuoZnM0fg7k1/ratr4= github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.1/go.mod h1:GeUru+8VzrTXV/83XyMJ80KpH8xO89VPoUileyNQ+tc= github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.6 h1:9mvDAsMiN+07wcfGM+hJ1J3dOKZ2YOpDiPZ6ufRJcgw= github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.6/go.mod h1:Eus+Z2iBIEfhOvhSdMTcscNOMy6n3X9/BJV0Zgax98w= github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5 h1:gRW1ZisKc93EWEORNJRvy/ZydF3o6xLSveJHdi1Oa0U= github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5/go.mod h1:ZbkttHXaVn3bBo/wpJbQGiiIWR90eTBUVBrEHUEQlho= github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.5 h1:DyPYkrH4R2zn+Pdu6hM3VTuPsQYAE6x2WB24X85Sgw0= github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.5/go.mod h1:XtL92YWo0Yq80iN3AgYRERJqohg4TozrqRlxYhHGJ7g= github.com/aws/aws-sdk-go-v2/service/s3 v1.26.10 h1:GWdLZK0r1AK5sKb8rhB9bEXqXCK8WNuyv4TBAD6ZviQ= github.com/aws/aws-sdk-go-v2/service/s3 v1.26.10/go.mod h1:+O7qJxF8nLorAhuIVhYTHse6okjHJJm4EwhhzvpnkT0= github.com/aws/aws-sdk-go-v2/service/sso v1.11.6 h1:AnTIdD439WgYNyVldYlpccGWY2EIXoUNmVzTDbFqCsg= github.com/aws/aws-sdk-go-v2/service/sso v1.11.6/go.mod h1:TFVe6Rr2joVLsYQ1ABACXgOC6lXip/qpX2x5jWg/A9w= github.com/aws/aws-sdk-go-v2/service/sts v1.16.6 h1:aYToU0/iazkMY67/BYLt3r6/LT/mUtarLAF5mGof1Kg= github.com/aws/aws-sdk-go-v2/service/sts v1.16.6/go.mod h1:rP1rEOKAGZoXp4iGDxSXFvODAtXpm34Egf0lL0eshaQ= github.com/aws/smithy-go v1.11.2 h1:eG/N+CcUMAvsdffgMvjMKwfyDzIkjM6pfxMJ8Mzc6mE= github.com/aws/smithy-go v1.11.2/go.mod h1:3xHYmszWVx2c0kIwQeEVf9uSm4fYZt67FBJnwub1bgM= github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o= github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE= github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg= github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo= github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8= github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4= golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10= gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= ================================================ FILE: aws-s3/main.go ================================================ package main import ( "context" "fmt" "os" "strings" "github.com/aws/aws-sdk-go-v2/aws" "github.com/aws/aws-sdk-go-v2/config" "github.com/aws/aws-sdk-go-v2/feature/s3/manager" "github.com/aws/aws-sdk-go-v2/service/s3" ) const s3BucketName = "go-aws-test-xz9" func main() { var ( s3Client *s3.Client err error out []byte ) if s3Client, err = initS3Client(context.Background(), "us-east-1"); err != nil { fmt.Printf("initConfig error: %s", err) os.Exit(1) } if err = createS3Bucket(context.Background(), s3Client); err != nil { fmt.Printf("createS3Bucket error: %s", err) os.Exit(1) } if err = uploadFileToS3(context.Background(), s3Client); err != nil { fmt.Printf("uploadFileToS3 error: %s", err) os.Exit(1) } fmt.Printf("Uploaded file.\n") if out, err = downloadFileFromS3(context.Background(), s3Client); err != nil { fmt.Printf("uploadFileToS3 error: %s", err) os.Exit(1) } fmt.Printf("Downloaded file with contents: %s", out) } func initS3Client(ctx context.Context, region string) (*s3.Client, error) { cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion(region)) if err != nil { return nil, fmt.Errorf("Config error: %s", err) } return s3.NewFromConfig(cfg), nil } func createS3Bucket(ctx context.Context, s3Client *s3.Client) error { _, err := s3Client.CreateBucket(ctx, &s3.CreateBucketInput{ Bucket: aws.String(s3BucketName), }) if err != nil { return fmt.Errorf("CreateBucket error: %s", err) } return nil } func uploadFileToS3(ctx context.Context, s3Client *s3.Client) error { uploader := manager.NewUploader(s3Client) _, err := uploader.Upload(ctx, &s3.PutObjectInput{ Bucket: aws.String(s3BucketName), Key: aws.String("test.txt"), Body: strings.NewReader("this is a test"), }) if err != nil { return fmt.Errorf("Upload error: %s", err) } return nil } func downloadFileFromS3(ctx context.Context, s3Client *s3.Client) ([]byte, error) { buffer := manager.NewWriteAtBuffer([]byte{}) downloader := manager.NewDownloader(s3Client) numBytes, err := downloader.Download(ctx, buffer, &s3.GetObjectInput{ Bucket: aws.String(s3BucketName), Key: aws.String("test.txt"), }) if err != nil { return buffer.Bytes(), fmt.Errorf("Upload error: %s", err) } if bytesReceived := int64(len(buffer.Bytes())); numBytes != bytesReceived { return buffer.Bytes(), fmt.Errorf("Incorrect number of bytes returned. Got %d, but expected %d", numBytes, bytesReceived) } return buffer.Bytes(), nil } ================================================ FILE: aws-s3-testing/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/aws-s3-testing go 1.25.4 require ( github.com/aws/aws-sdk-go-v2 v1.16.4 github.com/aws/aws-sdk-go-v2/config v1.15.8 github.com/aws/aws-sdk-go-v2/service/s3 v1.26.10 ) require github.com/jmespath/go-jmespath v0.4.0 // indirect require ( github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.1 // indirect github.com/aws/aws-sdk-go-v2/credentials v1.12.3 // indirect github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5 // indirect github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.13 github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11 // indirect github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5 // indirect github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12 // indirect github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.2 // indirect github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.1 // indirect github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.6 // indirect github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5 // indirect github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.5 // indirect github.com/aws/aws-sdk-go-v2/service/sso v1.11.6 // indirect github.com/aws/aws-sdk-go-v2/service/sts v1.16.6 // indirect github.com/aws/smithy-go v1.11.2 // indirect ) ================================================ FILE: aws-s3-testing/go.sum ================================================ github.com/aws/aws-sdk-go-v2 v1.16.4 h1:swQTEQUyJF/UkEA94/Ga55miiKFoXmm/Zd67XHgmjSg= github.com/aws/aws-sdk-go-v2 v1.16.4/go.mod h1:ytwTPBG6fXTZLxxeeCCWj2/EMYp/xDUgX+OET6TLNNU= github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.1 h1:SdK4Ppk5IzLs64ZMvr6MrSficMtjY2oS0WOORXTlxwU= github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.1/go.mod h1:n8Bs1ElDD2wJ9kCRTczA83gYbBmjSwZp3umc6zF4EeM= github.com/aws/aws-sdk-go-v2/config v1.15.8 h1:Mk9aPT1JiPkhZO9PIP1w2ramuRw95d9w5YNOM3poTKk= github.com/aws/aws-sdk-go-v2/config v1.15.8/go.mod h1:Z/guryqWzLw1T3pJbFA0/V3aVXw0sX5oH4lXXiD67aY= github.com/aws/aws-sdk-go-v2/credentials v1.12.3 h1:1kPx2lGjvopx7IMqKFmqmhqcuDZQ7pvq9xNXPP5c6qo= github.com/aws/aws-sdk-go-v2/credentials v1.12.3/go.mod h1:p6/NGiaGKKM3ihOt/W08Ikz7/F95WhvgjA4x6MWKdS8= github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5 h1:YPxclBeE07HsLQE8vtjC8T2emcTjM9nzqsnDi2fv5UM= github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.5/go.mod h1:WAPnuhG5IQ/i6DETFl5NmX3kKqCzw7aau9NHAGcm4QE= github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.13 h1:bDtJV1rjBZNU3YWTptrUxBvl9URGXadCeYXb1uA166M= github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.13/go.mod h1:Dzx6Ckq2RPPa8VgvmxZyszhRVXXHeskGRBdr5myunJ0= github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11 h1:gsqHplNh1DaQunEKZISK56wlpbCg0yKxNVvGWCFuF1k= github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.11/go.mod h1:tmUB6jakq5DFNcXsXOA/ZQ7/C8VnSKYkx58OI7Fh79g= github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5 h1:PLFj+M2PgIDHG//hw3T0O0KLI4itVtAjtxrZx4AHPLg= github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.5/go.mod h1:fV1AaS2gFc1tM0RCb015FJ0pvWVUfJZANzjwoO4YakM= github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12 h1:j0VqrjtgsY1Bx27tD0ysay36/K4kFMWRp9K3ieO9nLU= github.com/aws/aws-sdk-go-v2/internal/ini v1.3.12/go.mod h1:00c7+ALdPh4YeEUPXJzyU0Yy01nPGOq2+9rUaz05z9g= github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.2 h1:1fs9WkbFcMawQjxEI0B5L0SqvBhJZebxWM6Z3x/qHWY= github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.2/go.mod h1:0jDVeWUFPbI3sOfsXXAsIdiawXcn7VBLx/IlFVTRP64= github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.1 h1:T4pFel53bkHjL2mMo+4DKE6r6AuoZnM0fg7k1/ratr4= github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.1/go.mod h1:GeUru+8VzrTXV/83XyMJ80KpH8xO89VPoUileyNQ+tc= github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.6 h1:9mvDAsMiN+07wcfGM+hJ1J3dOKZ2YOpDiPZ6ufRJcgw= github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.6/go.mod h1:Eus+Z2iBIEfhOvhSdMTcscNOMy6n3X9/BJV0Zgax98w= github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5 h1:gRW1ZisKc93EWEORNJRvy/ZydF3o6xLSveJHdi1Oa0U= github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.5/go.mod h1:ZbkttHXaVn3bBo/wpJbQGiiIWR90eTBUVBrEHUEQlho= github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.5 h1:DyPYkrH4R2zn+Pdu6hM3VTuPsQYAE6x2WB24X85Sgw0= github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.5/go.mod h1:XtL92YWo0Yq80iN3AgYRERJqohg4TozrqRlxYhHGJ7g= github.com/aws/aws-sdk-go-v2/service/s3 v1.26.10 h1:GWdLZK0r1AK5sKb8rhB9bEXqXCK8WNuyv4TBAD6ZviQ= github.com/aws/aws-sdk-go-v2/service/s3 v1.26.10/go.mod h1:+O7qJxF8nLorAhuIVhYTHse6okjHJJm4EwhhzvpnkT0= github.com/aws/aws-sdk-go-v2/service/sso v1.11.6 h1:AnTIdD439WgYNyVldYlpccGWY2EIXoUNmVzTDbFqCsg= github.com/aws/aws-sdk-go-v2/service/sso v1.11.6/go.mod h1:TFVe6Rr2joVLsYQ1ABACXgOC6lXip/qpX2x5jWg/A9w= github.com/aws/aws-sdk-go-v2/service/sts v1.16.6 h1:aYToU0/iazkMY67/BYLt3r6/LT/mUtarLAF5mGof1Kg= github.com/aws/aws-sdk-go-v2/service/sts v1.16.6/go.mod h1:rP1rEOKAGZoXp4iGDxSXFvODAtXpm34Egf0lL0eshaQ= github.com/aws/smithy-go v1.11.2 h1:eG/N+CcUMAvsdffgMvjMKwfyDzIkjM6pfxMJ8Mzc6mE= github.com/aws/smithy-go v1.11.2/go.mod h1:3xHYmszWVx2c0kIwQeEVf9uSm4fYZt67FBJnwub1bgM= github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o= github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE= github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg= github.com/jmespath/go-jmespath v0.4.0/go.mod h1:T8mJZnbsbmF+m6zOOFylbeCJqk5+pHWvzYPziyZiYoo= github.com/jmespath/go-jmespath/internal/testify v1.5.1 h1:shLQSRRSCCPj3f2gpwzGwWFoC7ycTf1rcQZHOlsJ6N8= github.com/jmespath/go-jmespath/internal/testify v1.5.1/go.mod h1:L3OGu8Wl2/fWfCI6z80xFu9LTZmf1ZRjMHUOPmWr69U= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4= golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10= gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= ================================================ FILE: aws-s3-testing/main.go ================================================ package main import ( "bytes" "context" "fmt" "io" "io/ioutil" "os" "github.com/aws/aws-sdk-go-v2/aws" "github.com/aws/aws-sdk-go-v2/config" "github.com/aws/aws-sdk-go-v2/feature/s3/manager" "github.com/aws/aws-sdk-go-v2/service/s3" "github.com/aws/aws-sdk-go-v2/service/s3/types" ) const bucketName = "aws-demo-test-bucket-95fd1" const regionName = "us-east-1" type S3Client interface { ListBuckets(ctx context.Context, params *s3.ListBucketsInput, optFns ...func(*s3.Options)) (*s3.ListBucketsOutput, error) CreateBucket(ctx context.Context, params *s3.CreateBucketInput, optFns ...func(*s3.Options)) (*s3.CreateBucketOutput, error) } type S3Uploader interface { Upload(ctx context.Context, input *s3.PutObjectInput, opts ...func(*manager.Uploader)) (*manager.UploadOutput, error) } type S3Downloader interface { Download(ctx context.Context, w io.WriterAt, input *s3.GetObjectInput, options ...func(*manager.Downloader)) (n int64, err error) } func main() { var ( s3Client *s3.Client err error out []byte ) ctx := context.Background() if s3Client, err = initS3Client(ctx); err != nil { fmt.Printf("initS3Client error: %s", err) os.Exit(1) } if err = createS3Bucket(ctx, s3Client); err != nil { fmt.Printf("initS3Client error: %s", err) os.Exit(1) } if err = uploadToS3Bucket(ctx, manager.NewUploader(s3Client), "test.txt"); err != nil { fmt.Printf("uploadToS3Bucket error: %s", err) os.Exit(1) } fmt.Printf("Upload complete.\n") if out, err = downloadFromS3(ctx, manager.NewDownloader(s3Client)); err != nil { fmt.Printf("uploadToS3Bucket error: %s", err) os.Exit(1) } fmt.Printf("Download complete: %s\n", out) } func initS3Client(ctx context.Context) (*s3.Client, error) { cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion(regionName)) if err != nil { return nil, fmt.Errorf("unable to load SDK config, %s", err) } return s3.NewFromConfig(cfg), nil } func createS3Bucket(ctx context.Context, s3Client S3Client) error { allBuckets, err := s3Client.ListBuckets(ctx, &s3.ListBucketsInput{}) if err != nil { return fmt.Errorf("ListBuckets error: %s", err) } found := false for _, bucket := range allBuckets.Buckets { if *bucket.Name == bucketName { found = true } } if !found { _, err := s3Client.CreateBucket(ctx, &s3.CreateBucketInput{ Bucket: aws.String(bucketName), CreateBucketConfiguration: &types.CreateBucketConfiguration{ LocationConstraint: regionName, }, }) if err != nil { return fmt.Errorf("CreateBucket error: %s", err) } } return nil } func uploadToS3Bucket(ctx context.Context, uploader S3Uploader, filename string) error { testFile, err := ioutil.ReadFile(filename) if err != nil { return fmt.Errorf("ReadFile error: %s", err) } _, err = uploader.Upload(ctx, &s3.PutObjectInput{ Bucket: aws.String(bucketName), Key: aws.String(filename), Body: bytes.NewReader(testFile), }) if err != nil { return fmt.Errorf("Upload error: %s", err) } return nil } func downloadFromS3(ctx context.Context, downloader S3Downloader) ([]byte, error) { buffer := manager.NewWriteAtBuffer([]byte{}) numBytes, err := downloader.Download(ctx, buffer, &s3.GetObjectInput{ Bucket: aws.String(bucketName), Key: aws.String("test.txt"), }) if err != nil { return nil, fmt.Errorf("Download error: %s", err) } if numBytesReceived := len(buffer.Bytes()); numBytes != int64(numBytesReceived) { return nil, fmt.Errorf("Numbytes received doesn't match: %d vs %d", numBytes, numBytesReceived) } return buffer.Bytes(), nil } ================================================ FILE: aws-s3-testing/main_test.go ================================================ package main import ( "context" "testing" "github.com/aws/aws-sdk-go-v2/aws" "github.com/aws/aws-sdk-go-v2/feature/s3/manager" "github.com/aws/aws-sdk-go-v2/service/s3" "github.com/aws/aws-sdk-go-v2/service/s3/types" ) type MockS3Client struct { ListBucketsOutput *s3.ListBucketsOutput CreateBucketOutput *s3.CreateBucketOutput } func (m MockS3Client) ListBuckets(ctx context.Context, params *s3.ListBucketsInput, optFns ...func(*s3.Options)) (*s3.ListBucketsOutput, error) { return m.ListBucketsOutput, nil } func (m MockS3Client) CreateBucket(ctx context.Context, params *s3.CreateBucketInput, optFns ...func(*s3.Options)) (*s3.CreateBucketOutput, error) { return m.CreateBucketOutput, nil } type MockS3Uploader struct { UploadOutput *manager.UploadOutput } func (m MockS3Uploader) Upload(ctx context.Context, input *s3.PutObjectInput, opts ...func(*manager.Uploader)) (*manager.UploadOutput, error) { return m.UploadOutput, nil } func TestCreateS3Bucket(t *testing.T) { ctx := context.Background() err := createS3Bucket(ctx, MockS3Client{ ListBucketsOutput: &s3.ListBucketsOutput{ Buckets: []types.Bucket{ { Name: aws.String("test-bucket"), }, { Name: aws.String("test-bucket-2"), }, }, }, CreateBucketOutput: &s3.CreateBucketOutput{}, }) if err != nil { t.Fatalf("createS3Bucket error: %s", err) } } func TestUploadToS3Bucket(t *testing.T) { mockUploader := MockS3Uploader{ UploadOutput: &manager.UploadOutput{}, } err := uploadToS3Bucket(context.Background(), mockUploader, "testdata/test.txt") if err != nil { t.Fatalf("UploadToS3Bucket error: %s", err) } } ================================================ FILE: aws-s3-testing/testdata/test.txt ================================================ this is a test file ================================================ FILE: azure-instance/.gitignore ================================================ mykey.* ================================================ FILE: azure-instance/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/azure-instance go 1.25.4 require ( github.com/Azure/azure-sdk-for-go/sdk/azcore v1.11.1 github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.6.0 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute v1.0.0 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork v1.0.0 github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armresources v1.0.0 github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220613154127-4d821abdce2f ) require ( github.com/Azure/azure-sdk-for-go/sdk/internal v1.8.0 // indirect github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2 // indirect github.com/golang-jwt/jwt/v5 v5.2.2 // indirect github.com/google/uuid v1.6.0 // indirect github.com/kylelemons/godebug v1.1.0 // indirect github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect golang.org/x/crypto v0.45.0 // indirect golang.org/x/net v0.47.0 // indirect golang.org/x/sys v0.38.0 // indirect golang.org/x/term v0.37.0 // indirect golang.org/x/text v0.31.0 // indirect ) ================================================ FILE: azure-instance/go.sum ================================================ github.com/Azure/azure-sdk-for-go/sdk/azcore v1.11.1 h1:E+OJmp2tPvt1W+amx48v1eqbjDYsgN+RzP4q16yV5eM= github.com/Azure/azure-sdk-for-go/sdk/azcore v1.11.1/go.mod h1:a6xsAQUZg+VsS3TJ05SRp524Hs4pZ/AeFSr5ENf0Yjo= github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.6.0 h1:U2rTu3Ef+7w9FHKIAXM6ZyqF3UOWJZ12zIm8zECAFfg= github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.6.0/go.mod h1:9kIvujWAA58nmPmWB1m23fyWic1kYZMxD9CxaWn4Qpg= github.com/Azure/azure-sdk-for-go/sdk/internal v1.8.0 h1:jBQA3cKT4L2rWMpgE7Yt3Hwh2aUj8KXjIGLxjHeYNNo= github.com/Azure/azure-sdk-for-go/sdk/internal v1.8.0/go.mod h1:4OG6tQ9EOP/MT0NMjDlRzWoVFxfu9rN9B2X+tlSVktg= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute v1.0.0 h1:/Di3vB4sNeQ+7A8efjUVENvyB945Wruvstucqp7ZArg= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute v1.0.0/go.mod h1:gM3K25LQlsET3QR+4V74zxCsFAy0r6xMNN9n80SZn+4= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/internal v1.0.0 h1:lMW1lD/17LUA5z1XTURo7LcVG2ICBPlyMHjIUrcFZNQ= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/internal v1.0.0/go.mod h1:ceIuwmxDWptoW3eCqSXlnPsZFKh4X+R38dWPv7GS9Vs= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork v1.0.0 h1:nBy98uKOIfun5z6wx6jwWLrULcM0+cjBalBFZlEZ7CA= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork v1.0.0/go.mod h1:243D9iHbcQXoFUtgHJwL7gl2zx1aDuDMjvBZVGr2uW0= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armresources v1.0.0 h1:ECsQtyERDVz3NP3kvDOTLvbQhqWp/x9EsGKtb4ogUr8= github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armresources v1.0.0/go.mod h1:s1tW/At+xHqjNFvWU4G0c0Qv33KOhvbGNj0RCTQDV8s= github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2 h1:XHOnouVk1mxXfQidrMEnLlPk9UMeRtyBTnEFtxkV0kU= github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2/go.mod h1:wP83P5OoQ5p6ip3ScPr0BAq0BvuPAvacpEuSzyouqAI= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/golang-jwt/jwt/v5 v5.2.2 h1:Rl4B7itRWVtYIHFrSNd7vhTiz9UpLdi6gZhZ3wEeDy8= github.com/golang-jwt/jwt/v5 v5.2.2/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk= github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0= github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo= github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc= github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw= github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ= github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg= github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY= github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220613154127-4d821abdce2f h1:04DZtFhIucQxargJpUClZvIQ1FNSJHCOnbOhBOVTzos= github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220613154127-4d821abdce2f/go.mod h1:nMRrSdJ6buN2/nVCX4zAr1VTIzeZNqK7SgTepO1zRdA= golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q= golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4= golang.org/x/net v0.47.0 h1:Mx+4dIFzqraBXUugkia1OOvlD6LemFo1ALMHjrXDOhY= golang.org/x/net v0.47.0/go.mod h1:/jNxtkgq5yWUGYkaZGqo27cfGZ1c5Nen03aYrrKpVRU= golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc= golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks= golang.org/x/term v0.37.0 h1:8EGAD0qCmHYZg6J17DvsMy9/wJ7/D/4pV/wfnld5lTU= golang.org/x/term v0.37.0/go.mod h1:5pB4lxRNYYVZuTLmy8oR2BH8dflOR+IbTYFD8fi3254= golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM= golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM= gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= ================================================ FILE: azure-instance/main.go ================================================ package main import ( "context" "errors" "fmt" "os" "github.com/Azure/azure-sdk-for-go/sdk/azcore" "github.com/Azure/azure-sdk-for-go/sdk/azcore/to" "github.com/Azure/azure-sdk-for-go/sdk/azidentity" "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/compute/armcompute" "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/network/armnetwork" "github.com/Azure/azure-sdk-for-go/sdk/resourcemanager/resources/armresources" "github.com/wardviaene/golang-for-devops-course/ssh-demo" ) const location = "westus" func main() { var ( token azcore.TokenCredential pubKey string err error ) ctx := context.Background() subscriptionID := os.Getenv("SUBSCRIPTION_ID") if len(subscriptionID) == 0 { fmt.Printf("No subscription ID was provided") os.Exit(1) } if pubKey, err = generateKeys(); err != nil { fmt.Printf("generatekeys error: %s\n", err) os.Exit(1) } if token, err = getToken(); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } if err = launchInstance(ctx, subscriptionID, token, &pubKey); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } } func generateKeys() (string, error) { var ( privateKey []byte publicKey []byte err error ) if privateKey, publicKey, err = ssh.GenerateKeys(); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } if err = os.WriteFile("mykey.pem", privateKey, 0600); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } if err = os.WriteFile("mykey.pub", publicKey, 0644); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } return string(publicKey), nil } func getToken() (azcore.TokenCredential, error) { token, err := azidentity.NewAzureCLICredential(nil) if err != nil { return token, err } return token, nil } func launchInstance(ctx context.Context, subscriptionID string, cred azcore.TokenCredential, pubKey *string) error { // create resource client resourceGroupClient, err := armresources.NewResourceGroupsClient(subscriptionID, cred, nil) if err != nil { return err } resourceGroupParams := armresources.ResourceGroup{ Location: to.Ptr(location), } resourcegroupResponse, err := resourceGroupClient.CreateOrUpdate(ctx, "go-azure-demo", resourceGroupParams, nil) if err != nil { return err } // create vnet virtualNetworkClient, err := armnetwork.NewVirtualNetworksClient(subscriptionID, cred, nil) if err != nil { return err } vnet, found, err := findVnet(ctx, *resourcegroupResponse.Name, "go-demo", virtualNetworkClient) if err != nil { return err } if !found { vnetPollerResp, err := virtualNetworkClient.BeginCreateOrUpdate( ctx, *resourcegroupResponse.Name, "go-demo", armnetwork.VirtualNetwork{ Location: to.Ptr(location), Properties: &armnetwork.VirtualNetworkPropertiesFormat{ AddressSpace: &armnetwork.AddressSpace{ AddressPrefixes: []*string{ to.Ptr("10.1.0.0/16"), }, }, }, }, nil) if err != nil { return err } vnetResponse, err := vnetPollerResp.PollUntilDone(ctx, nil) if err != nil { return err } vnet = vnetResponse.VirtualNetwork } // subnet subnetsClient, err := armnetwork.NewSubnetsClient(subscriptionID, cred, nil) if err != nil { return err } subnetsPollerResp, err := subnetsClient.BeginCreateOrUpdate( ctx, *resourcegroupResponse.Name, *vnet.Name, "go-demo", armnetwork.Subnet{ Properties: &armnetwork.SubnetPropertiesFormat{ AddressPrefix: to.Ptr("10.1.0.0/24"), }, }, nil, ) if err != nil { return err } subnetResponse, err := subnetsPollerResp.PollUntilDone(ctx, nil) if err != nil { return err } // Public IP publicIPAddressClient, err := armnetwork.NewPublicIPAddressesClient(subscriptionID, cred, nil) if err != nil { return err } publicIPPollerResponse, err := publicIPAddressClient.BeginCreateOrUpdate( ctx, *resourcegroupResponse.Name, "go-demo", armnetwork.PublicIPAddress{ Location: to.Ptr(location), Properties: &armnetwork.PublicIPAddressPropertiesFormat{ PublicIPAllocationMethod: to.Ptr(armnetwork.IPAllocationMethodStatic), }, }, nil, ) if err != nil { return err } publicIPAddressResponse, err := publicIPPollerResponse.PollUntilDone(ctx, nil) if err != nil { return err } // Network Security Group NewSecurityGroupsClient, err := armnetwork.NewSecurityGroupsClient(subscriptionID, cred, nil) if err != nil { return err } networkSecurityGroupPollerResponse, err := NewSecurityGroupsClient.BeginCreateOrUpdate( ctx, *resourcegroupResponse.Name, "go-demo", armnetwork.SecurityGroup{ Location: to.Ptr(location), Properties: &armnetwork.SecurityGroupPropertiesFormat{ SecurityRules: []*armnetwork.SecurityRule{ { Name: to.Ptr("allow-ssh"), Properties: &armnetwork.SecurityRulePropertiesFormat{ SourceAddressPrefix: to.Ptr("0.0.0.0/0"), SourcePortRange: to.Ptr("*"), DestinationAddressPrefix: to.Ptr("0.0.0.0/0"), DestinationPortRange: to.Ptr("22"), Protocol: to.Ptr(armnetwork.SecurityRuleProtocolTCP), Access: to.Ptr(armnetwork.SecurityRuleAccessAllow), Description: to.Ptr("allow ssh on port 22"), Direction: to.Ptr(armnetwork.SecurityRuleDirectionInbound), Priority: to.Ptr(int32(1001)), }, }, }, }, }, nil, ) if err != nil { return err } networkSecurityGroupResponse, err := networkSecurityGroupPollerResponse.PollUntilDone(ctx, nil) if err != nil { return err } interfaceClient, err := armnetwork.NewInterfacesClient(subscriptionID, cred, nil) if err != nil { return err } nicPollerResponse, err := interfaceClient.BeginCreateOrUpdate( ctx, *resourcegroupResponse.Name, "go-demo", armnetwork.Interface{ Location: to.Ptr(location), Properties: &armnetwork.InterfacePropertiesFormat{ NetworkSecurityGroup: &armnetwork.SecurityGroup{ ID: networkSecurityGroupResponse.ID, }, IPConfigurations: []*armnetwork.InterfaceIPConfiguration{ { Name: to.Ptr("go-demo"), Properties: &armnetwork.InterfaceIPConfigurationPropertiesFormat{ PrivateIPAllocationMethod: to.Ptr(armnetwork.IPAllocationMethodDynamic), Subnet: &armnetwork.Subnet{ ID: subnetResponse.ID, }, PublicIPAddress: &armnetwork.PublicIPAddress{ ID: publicIPAddressResponse.ID, }, }, }, }, }, }, nil, ) if err != nil { return err } nicResponse, err := nicPollerResponse.PollUntilDone(ctx, nil) if err != nil { return err } // Create VM fmt.Printf("Creating VM:\n") vmClient, err := armcompute.NewVirtualMachinesClient(subscriptionID, cred, nil) if err != nil { return err } parameters := armcompute.VirtualMachine{ Location: to.Ptr(location), Identity: &armcompute.VirtualMachineIdentity{ Type: to.Ptr(armcompute.ResourceIdentityTypeNone), }, Properties: &armcompute.VirtualMachineProperties{ StorageProfile: &armcompute.StorageProfile{ ImageReference: &armcompute.ImageReference{ Offer: to.Ptr("0001-com-ubuntu-server-focal"), Publisher: to.Ptr("canonical"), SKU: to.Ptr("20_04-lts-gen2"), Version: to.Ptr("latest"), }, OSDisk: &armcompute.OSDisk{ Name: to.Ptr("go-demo"), CreateOption: to.Ptr(armcompute.DiskCreateOptionTypesFromImage), Caching: to.Ptr(armcompute.CachingTypesReadWrite), ManagedDisk: &armcompute.ManagedDiskParameters{ StorageAccountType: to.Ptr(armcompute.StorageAccountTypesStandardLRS), // OSDisk type Standard/Premium HDD/SSD }, DiskSizeGB: to.Ptr[int32](50), // default 127G }, }, HardwareProfile: &armcompute.HardwareProfile{ VMSize: to.Ptr(armcompute.VirtualMachineSizeTypes("Standard_B1s")), // VM size include vCPUs,RAM,Data Disks,Temp storage. }, OSProfile: &armcompute.OSProfile{ // ComputerName: to.Ptr("go-demo"), AdminUsername: to.Ptr("demo"), LinuxConfiguration: &armcompute.LinuxConfiguration{ DisablePasswordAuthentication: to.Ptr(true), SSH: &armcompute.SSHConfiguration{ PublicKeys: []*armcompute.SSHPublicKey{ { Path: to.Ptr(fmt.Sprintf("/home/%s/.ssh/authorized_keys", "demo")), KeyData: pubKey, }, }, }, }, }, NetworkProfile: &armcompute.NetworkProfile{ NetworkInterfaces: []*armcompute.NetworkInterfaceReference{ { ID: nicResponse.ID, }, }, }, }, } pollerResponse, err := vmClient.BeginCreateOrUpdate(ctx, *resourcegroupResponse.Name, "go-demo", parameters, nil) if err != nil { return err } vmResponse, err := pollerResponse.PollUntilDone(ctx, nil) if err != nil { return err } fmt.Printf("VM Created: %s\n", *vmResponse.ID) return nil } func findVnet(ctx context.Context, resourceGroupName, vnetName string, vnetClient *armnetwork.VirtualNetworksClient) (armnetwork.VirtualNetwork, bool, error) { vnet, err := vnetClient.Get(ctx, resourceGroupName, vnetName, nil) if err != nil { var errResponse *azcore.ResponseError if errors.As(err, &errResponse) && errResponse.ErrorCode == "ResourceNotFound" { return vnet.VirtualNetwork, false, nil } return vnet.VirtualNetwork, false, err } return vnet.VirtualNetwork, true, nil } ================================================ FILE: dns-demo/cmd/dns-resolver/main.go ================================================ package main import ( "fmt" "log" "net" "github.com/wardviaene/golang-for-devops-course/dns-demo/pkg/dns" ) func main() { p, err := net.ListenPacket("udp", ":53") if err != nil { log.Fatal(err) } defer p.Close() for { buf := make([]byte, 512) n, addr, err := p.ReadFrom(buf) if err != nil { fmt.Printf("Connection error [%s]: %s\n", addr.String(), err) continue } go dns.HandlePacket(p, addr, buf[:n]) } } ================================================ FILE: dns-demo/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/dns-demo go 1.23.0 require golang.org/x/net v0.38.0 ================================================ FILE: dns-demo/go.sum ================================================ golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8= golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8= ================================================ FILE: dns-demo/pkg/dns/resolver.go ================================================ package dns import ( "bufio" "crypto/rand" "fmt" "math/big" "net" "strings" "golang.org/x/net/dns/dnsmessage" ) const ROOT_SERVERS = "198.41.0.4,199.9.14.201,192.33.4.12,199.7.91.13,192.203.230.10,192.5.5.241,192.112.36.4,198.97.190.53" func HandlePacket(pc net.PacketConn, addr net.Addr, buf []byte) { if err := handlePacket(pc, addr, buf); err != nil { fmt.Printf("handlePacket error [%s]: %s\n", addr.String(), err) } } func handlePacket(pc net.PacketConn, addr net.Addr, buf []byte) error { p := dnsmessage.Parser{} header, err := p.Start(buf) if err != nil { return err } question, err := p.Question() if err != nil { return err } response, err := dnsQuery(getRootServers(), question) if err != nil { return err } response.Header.ID = header.ID responseBuffer, err := response.Pack() if err != nil { return err } _, err = pc.WriteTo(responseBuffer, addr) if err != nil { return err } return nil } func dnsQuery(servers []net.IP, question dnsmessage.Question) (*dnsmessage.Message, error) { fmt.Printf("Question: %+v\n", question) for i := 0; i < 3; i++ { dnsAnswer, header, err := outgoingDnsQuery(servers, question) if err != nil { return nil, err } parsedAnswers, err := dnsAnswer.AllAnswers() if err != nil { return nil, err } if header.Authoritative { return &dnsmessage.Message{ Header: dnsmessage.Header{Response: true}, Answers: parsedAnswers, }, nil } authorities, err := dnsAnswer.AllAuthorities() if err != nil { return nil, err } if len(authorities) == 0 { return &dnsmessage.Message{ Header: dnsmessage.Header{RCode: dnsmessage.RCodeNameError}, }, nil } nameservers := make([]string, len(authorities)) for k, authority := range authorities { if authority.Header.Type == dnsmessage.TypeNS { nameservers[k] = authority.Body.(*dnsmessage.NSResource).NS.String() } } additionals, err := dnsAnswer.AllAdditionals() if err != nil { return nil, err } newResolverServersFound := false servers = []net.IP{} for _, additional := range additionals { if additional.Header.Type == dnsmessage.TypeA { for _, nameserver := range nameservers { if additional.Header.Name.String() == nameserver { newResolverServersFound = true servers = append(servers, additional.Body.(*dnsmessage.AResource).A[:]) } } } } if !newResolverServersFound { for _, nameserver := range nameservers { if !newResolverServersFound { response, err := dnsQuery(getRootServers(), dnsmessage.Question{Name: dnsmessage.MustNewName(nameserver), Type: dnsmessage.TypeA, Class: dnsmessage.ClassINET}) if err != nil { fmt.Printf("warning: lookup of nameserver %s failed: %err\n", nameserver, err) } else { newResolverServersFound = true for _, answer := range response.Answers { if answer.Header.Type == dnsmessage.TypeA { servers = append(servers, answer.Body.(*dnsmessage.AResource).A[:]) } } } } } } } return &dnsmessage.Message{ Header: dnsmessage.Header{RCode: dnsmessage.RCodeServerFailure}, }, nil } func outgoingDnsQuery(servers []net.IP, question dnsmessage.Question) (*dnsmessage.Parser, *dnsmessage.Header, error) { fmt.Printf("New outgoing dns query for %s, servers: %+v\n", question.Name.String(), servers) max := ^uint16(0) randomNumber, err := rand.Int(rand.Reader, big.NewInt(int64(max))) if err != nil { return nil, nil, err } message := dnsmessage.Message{ Header: dnsmessage.Header{ ID: uint16(randomNumber.Int64()), Response: false, OpCode: dnsmessage.OpCode(0), }, Questions: []dnsmessage.Question{question}, } buf, err := message.Pack() if err != nil { return nil, nil, err } var conn net.Conn for _, server := range servers { conn, err = net.Dial("udp", server.String()+":53") if err == nil { break } } if conn == nil { return nil, nil, fmt.Errorf("failed to make connection to servers: %s", err) } _, err = conn.Write(buf) if err != nil { return nil, nil, err } answer := make([]byte, 512) n, err := bufio.NewReader(conn).Read(answer) if err != nil { return nil, nil, err } conn.Close() var p dnsmessage.Parser header, err := p.Start(answer[:n]) if err != nil { return nil, nil, fmt.Errorf("parser start error: %s", err) } questions, err := p.AllQuestions() if err != nil { return nil, nil, err } if len(questions) != len(message.Questions) { return nil, nil, fmt.Errorf("answer packet doesn't have the same amount of questions") } err = p.SkipAllQuestions() if err != nil { return nil, nil, err } return &p, &header, nil } func getRootServers() []net.IP { rootServers := []net.IP{} for _, rootServer := range strings.Split(ROOT_SERVERS, ",") { rootServers = append(rootServers, net.ParseIP(rootServer)) } return rootServers } ================================================ FILE: dns-demo/pkg/dns/resolver_test.go ================================================ package dns import ( "crypto/rand" "math/big" "net" "strings" "testing" "time" "golang.org/x/net/dns/dnsmessage" ) type MockPacketConn struct{} func (m *MockPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) { return 0, nil } func (m *MockPacketConn) Close() error { return nil } func (m *MockPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) { return 0, nil, nil } func (m *MockPacketConn) LocalAddr() net.Addr { return nil } func (m *MockPacketConn) SetDeadline(t time.Time) error { return nil } func (m *MockPacketConn) SetReadDeadline(t time.Time) error { return nil } func (m *MockPacketConn) SetWriteDeadline(t time.Time) error { return nil } func TestHandlePacket(t *testing.T) { names := []string{"www.google.com.", "www.amazon.com."} for _, name := range names { max := ^uint16(0) randomNumber, err := rand.Int(rand.Reader, big.NewInt(int64(max))) if err != nil { t.Fatalf("rand error: %s", err) } message := dnsmessage.Message{ Header: dnsmessage.Header{ RCode: dnsmessage.RCode(0), ID: uint16(randomNumber.Int64()), OpCode: dnsmessage.OpCode(0), Response: false, AuthenticData: false, RecursionDesired: false, }, Questions: []dnsmessage.Question{ { Name: dnsmessage.MustNewName(name), Type: dnsmessage.TypeA, Class: dnsmessage.ClassINET, }, }, } buf, err := message.Pack() if err != nil { t.Fatalf("Pack error: %s", err) } err = handlePacket(&MockPacketConn{}, &net.IPAddr{IP: net.ParseIP("127.0.0.1")}, buf) if err != nil { t.Fatalf("serve error: %s", err) } } } func TestOutgoingDnsQuery(t *testing.T) { question := dnsmessage.Question{ Name: dnsmessage.MustNewName("com."), Type: dnsmessage.TypeNS, Class: dnsmessage.ClassINET, } rootServers := strings.Split(ROOT_SERVERS, ",") if len(rootServers) == 0 { t.Fatalf("No root servers found") } servers := []net.IP{net.ParseIP(rootServers[0])} dnsAnswer, header, err := outgoingDnsQuery(servers, question) if err != nil { t.Fatalf("outgoingDnsQuery error: %s", err) } if header == nil { t.Fatalf("No header found") } if dnsAnswer == nil { t.Fatalf("no answer found") } if header.RCode != dnsmessage.RCodeSuccess { t.Fatalf("response was not succesful (maybe the DNS server has changed?)") } err = dnsAnswer.SkipAllAnswers() if err != nil { t.Fatalf("SkipAllAnswers error: %s", err) } parsedAuthorities, err := dnsAnswer.AllAuthorities() if err != nil { t.Fatalf("Error getting answers") } if len(parsedAuthorities) == 0 { t.Fatalf("No answers received") } } ================================================ FILE: dns-start/cmd/dns-resolver/main.go ================================================ package main import "fmt" func main() { fmt.Printf("Starting DNS Server...\n") } ================================================ FILE: dns-start/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/dns-start go 1.23.0 require golang.org/x/net v0.38.0 ================================================ FILE: dns-start/go.sum ================================================ golang.org/x/net v0.38.0 h1:vRMAPTMaeGqVhG5QyLJHqNDwecKTomGeqbnfZyKlBI8= golang.org/x/net v0.38.0/go.mod h1:ivrbrMbzFq5J41QOQh0siUuly180yBYtLp+CKbEaFx8= ================================================ FILE: dns-start/pkg/dns/resolver.go ================================================ package dns import ( "fmt" "net" "golang.org/x/net/dns/dnsmessage" ) const ROOT_SERVERS = "198.41.0.4,199.9.14.201,192.33.4.12,199.7.91.13,192.203.230.10,192.5.5.241,192.112.36.4,198.97.190.53" func handlePacket(pc net.PacketConn, addr net.Addr, buf []byte) error { return fmt.Errorf("not implemented yet") } func outgoingDnsQuery(servers []net.IP, question dnsmessage.Question) (*dnsmessage.Parser, *dnsmessage.Header, error) { return nil, nil, nil } ================================================ FILE: dns-start/pkg/dns/resolver_test.go ================================================ package dns import ( "crypto/rand" "math/big" "net" "strings" "testing" "time" "golang.org/x/net/dns/dnsmessage" ) type MockPacketConn struct{} func (m *MockPacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) { return 0, nil } func (m *MockPacketConn) Close() error { return nil } func (m *MockPacketConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) { return 0, nil, nil } func (m *MockPacketConn) LocalAddr() net.Addr { return nil } func (m *MockPacketConn) SetDeadline(t time.Time) error { return nil } func (m *MockPacketConn) SetReadDeadline(t time.Time) error { return nil } func (m *MockPacketConn) SetWriteDeadline(t time.Time) error { return nil } func TestHandlePacket(t *testing.T) { names := []string{"www.google.com.", "www.amazon.com."} for _, name := range names { max := ^uint16(0) randomNumber, err := rand.Int(rand.Reader, big.NewInt(int64(max))) if err != nil { t.Fatalf("rand error: %s", err) } message := dnsmessage.Message{ Header: dnsmessage.Header{ RCode: dnsmessage.RCode(0), ID: uint16(randomNumber.Int64()), OpCode: dnsmessage.OpCode(0), Response: false, AuthenticData: false, RecursionDesired: false, }, Questions: []dnsmessage.Question{ { Name: dnsmessage.MustNewName(name), Type: dnsmessage.TypeA, Class: dnsmessage.ClassINET, }, }, } buf, err := message.Pack() if err != nil { t.Fatalf("Pack error: %s", err) } err = handlePacket(&MockPacketConn{}, &net.IPAddr{IP: net.ParseIP("127.0.0.1")}, buf) if err != nil { t.Fatalf("serve error: %s", err) } } } func TestOutgoingDnsQuery(t *testing.T) { question := dnsmessage.Question{ Name: dnsmessage.MustNewName("com."), Type: dnsmessage.TypeNS, Class: dnsmessage.ClassINET, } if len(ROOT_SERVERS) == 0 { t.Fatalf("No root servers found") } rootServers := strings.Split(ROOT_SERVERS, ",") servers := []net.IP{net.ParseIP(rootServers[0])} dnsAnswer, header, err := outgoingDnsQuery(servers, question) if err != nil { t.Fatalf("outgoingDnsQuery error: %s", err) } if header == nil { t.Fatalf("No header found") } if dnsAnswer == nil { t.Fatalf("no answer found") } if header.RCode != dnsmessage.RCodeSuccess { t.Fatalf("response was not succesful (maybe the DNS server has changed?)") } err = dnsAnswer.SkipAllAnswers() if err != nil { t.Fatalf("SkipAllAnswers error: %s", err) } parsedAuthorities, err := dnsAnswer.AllAuthorities() if err != nil { t.Fatalf("Error getting answers") } if len(parsedAuthorities) == 0 { t.Fatalf("No answers received") } } ================================================ FILE: go.work ================================================ go 1.25.4 use ( ./aws-ec2 ./aws-s3 ./aws-s3-testing ./azure-instance ./dns-demo ./dns-start ./hello-world ./hello-world-arguments ./http-get ./http-get-errorhandling ./http-get-flags ./http-get-functions ./http-get-json ./http-get-json-map ./http-login ./http-login-packaged ./http-login-tests ./kubernetes-deploy ./kubernetes-deploy-github ./mutex-demo ./oidc-demo ./oidc-start ./reader-example ./slices-demo ./ssh-demo ./test-server ./tls-demo ./tls-start ./types-demo ) ================================================ FILE: go.work.sum ================================================ cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k= github.com/golang-jwt/jwt v3.2.1+incompatible h1:73Z+4BJcrTC+KczS6WvTPvRGOp1WmfEP4Q1lOd9Z/+c= github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY= github.com/google/uuid v1.1.2 h1:EVhdT+1Kseyi1/pUmXKaFxYsDNy9RQYkMWRH68J/W7Y= github.com/hashicorp/consul/api v1.12.0/go.mod h1:6pVBMo0ebnYdt2S3H87XhekM/HHrUoTD2XXb/VrZVy0= github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI= github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk= github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA= github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs= github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4= github.com/sagikazarmark/crypt v0.4.0/go.mod h1:ALv2SRj7GxYV4HO9elxH9nS6M9gW+xDNxqmyJ6RfDFM= github.com/spf13/cobra-cli v1.3.0/go.mod h1:zq1KeHo/9SQm1tNdbJhwVDd9bVpokbQwuG6MR0TFCdE= github.com/spf13/viper v1.10.1/go.mod h1:IGlFPqhNAPKRxohIzWpI5QEy4kuI7tcl5WvR+8qy1rU= github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY= golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDfU= golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8= golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4= golang.org/x/mod v0.9.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs= golang.org/x/mod v0.17.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c= golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c= golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44= golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac= golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM= golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk= golang.org/x/sync v0.11.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk= golang.org/x/sys v0.0.0-20211210111614-af8b64212486/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.2.0 h1:ljd4t30dBnAvMZaQCevtY0xLLD0A+bRZXbgLMLU1F/A= golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA= golang.org/x/telemetry v0.0.0-20240228155512-f48c80bd79b2/go.mod h1:TeRTkGYfJXctD9OcfyVLyj2J3IxLnKwHJR8f4D8a3YE= golang.org/x/term v0.2.0 h1:z85xZCsEl7bi/KwbNADeBYoOP0++7W1ipu+aGnpwzRM= golang.org/x/term v0.2.0/go.mod h1:TVmDHMZPmdnySmBfhjOoOdhjzdE1h4u1VwSiw2l1Nuc= golang.org/x/term v0.17.0/go.mod h1:lLRBjIVuehSbZlaOtGMbcMncT+aqLLLmKrsjNrUguwk= golang.org/x/term v0.20.0/go.mod h1:8UkIAJTvZgivsXaD6/pH6U9ecQzZ45awqEOzuCvwpFY= golang.org/x/text v0.4.0 h1:BrVqGRd7+k1DiOgtnFvAkoQEWQvBc25ouMJM6429SFg= golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8= golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU= golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU= golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM= golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY= golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc= golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58= golang.org/x/tools v0.21.1-0.20240508182429-e35e4ccd0d2d/go.mod h1:aiJjzUbINMkxbQROHiO6hDPo2LHcIPhhQsa9DLh0yGk= google.golang.org/api v0.63.0/go.mod h1:gs4ij2ffTRXwuzzgJl/56BdwJaA194ijkfn++9tDuPo= google.golang.org/grpc v1.43.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU= gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q= ================================================ FILE: hello-world/go.mod ================================================ module github.com/wardviaene/go-for-devops-course/hello-world go 1.25.4 ================================================ FILE: hello-world/main.go ================================================ package main import "fmt" func main() { fmt.Printf("hello world!") } ================================================ FILE: hello-world-arguments/go.mod ================================================ module github.com/wardviaene/go-for-devops-course/hello-world-arguments go 1.25.4 ================================================ FILE: hello-world-arguments/main.go ================================================ package main import ( "fmt" "os" ) func main() { args := os.Args if len(args) < 2 { fmt.Printf("Usage: ./hello-world-arguments \n") os.Exit(1) } fmt.Printf("hello world!\nos.Args: %v\nArguments: %v\n", args, args[1:]) } ================================================ FILE: http-get/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/http-get go 1.25.4 ================================================ FILE: http-get/main.go ================================================ package main import ( "fmt" "io" "log" "net/http" "net/url" "os" ) func main() { args := os.Args if len(args) < 2 { fmt.Printf("Usage: ./http-get \n") os.Exit(1) } if _, err := url.ParseRequestURI(args[1]); err != nil { fmt.Printf("Usage: ./http-get \n\nURL is not valid URL: %s\n", args[1]) os.Exit(1) } response, err := http.Get(args[1]) if err != nil { log.Fatal(err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { log.Fatal(err) } fmt.Printf("HTTP Status Code: %d\nBody: %s\n", response.StatusCode, string(body)) } ================================================ FILE: http-get-errorhandling/error.go ================================================ package main type RequestError struct { Body string HTTPCode int Err string } func (r RequestError) Error() string { return r.Err } ================================================ FILE: http-get-errorhandling/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/http-get-errorhandling go 1.25.4 ================================================ FILE: http-get-errorhandling/main.go ================================================ package main import ( "encoding/json" "fmt" "io" "net/http" "net/url" "os" "strings" ) type Page struct { Name string `json:"page"` } type Response interface { GetResponse() string } type Words struct { Input string `json:"input"` Words []string `json:"words"` } func (w Words) GetResponse() string { return fmt.Sprintf("Words: %s", strings.Join(w.Words, ", ")) } type Occurrence struct { Words map[string]int `json:"words"` } func (o Occurrence) GetResponse() string { words := []string{} for word, occurrence := range o.Words { words = append(words, fmt.Sprintf("%s (%d)", word, occurrence)) } return fmt.Sprintf("Words: %s", strings.Join(words, ", ")) } func main() { args := os.Args if len(args) < 2 { fmt.Printf("Usage: ./http-get \n") os.Exit(1) } res, err := doRequest(args[1]) if err != nil { if requestErr, ok := err.(RequestError); ok { fmt.Printf("Error occurred: %s (HTTP Error: %d, Body: %s)\n", requestErr.Error(), requestErr.HTTPCode, requestErr.Body) os.Exit(1) } fmt.Printf("Error occurred: %s\n", err) os.Exit(1) } if res == nil { fmt.Printf("No response\n") os.Exit(1) } fmt.Printf("Response: %s\n", res.GetResponse()) } func doRequest(requestURL string) (Response, error) { if _, err := url.ParseRequestURI(requestURL); err != nil { fmt.Printf("Usage: ./http-get \n\nURL is not valid URL: %s\n", requestURL) os.Exit(1) } response, err := http.Get(requestURL) if err != nil { return nil, fmt.Errorf("Get error: %s", err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { return nil, fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return nil, fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) } var page Page if !json.Valid(body) { return nil, RequestError{ Err: fmt.Sprintf("Response is not a json"), HTTPCode: response.StatusCode, Body: string(body), } } err = json.Unmarshal(body, &page) if err != nil { return nil, RequestError{ Err: fmt.Sprintf("Page unmarshal error: %s", err), HTTPCode: response.StatusCode, Body: string(body), } } switch page.Name { case "words": var words Words err = json.Unmarshal(body, &words) if err != nil { return nil, fmt.Errorf("Words unmarshal error: %s", err) } return words, nil case "occurrence": var occurrence Occurrence err = json.Unmarshal(body, &occurrence) if err != nil { return nil, fmt.Errorf("Occurrence unmarshal error: %s", err) } return occurrence, nil } return nil, nil } ================================================ FILE: http-get-flags/error.go ================================================ package main type RequestError struct { Body string HTTPCode int Err string } func (r RequestError) Error() string { return r.Err } ================================================ FILE: http-get-flags/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/http-get-flags go 1.25.4 ================================================ FILE: http-get-flags/main.go ================================================ package main import ( "encoding/json" "flag" "fmt" "io" "net/http" "net/url" "os" "strings" ) type Page struct { Name string `json:"page"` } type Response interface { GetResponse() string } type Words struct { Input string `json:"input"` Words []string `json:"words"` } func (w Words) GetResponse() string { return fmt.Sprintf("Words: %s", strings.Join(w.Words, ", ")) } type Occurrence struct { Words map[string]int `json:"words"` } func (o Occurrence) GetResponse() string { words := []string{} for word, occurrence := range o.Words { words = append(words, fmt.Sprintf("%s (%d)", word, occurrence)) } return fmt.Sprintf("Words: %s", strings.Join(words, ", ")) } func main() { var ( requestURL string password string parsedURL *url.URL err error ) flag.StringVar(&requestURL, "url", "", "url to access") flag.StringVar(&password, "password", "", "use a password to access our api") flag.Parse() if parsedURL, err = url.ParseRequestURI(requestURL); err != nil { fmt.Printf("Help: ./http-get -h\nURL is not valid URL: %s\n", requestURL) os.Exit(1) } res, err := doRequest(parsedURL.String()) if err != nil { if requestErr, ok := err.(RequestError); ok { fmt.Printf("Error occurred: %s (HTTP Error: %d, Body: %s)\n", requestErr.Error(), requestErr.HTTPCode, requestErr.Body) os.Exit(1) } fmt.Printf("Error occurred: %s\n", err) os.Exit(1) } if res == nil { fmt.Printf("No response\n") os.Exit(1) } fmt.Printf("Response: %s\n", res.GetResponse()) } func doRequest(requestURL string) (Response, error) { response, err := http.Get(requestURL) if err != nil { return nil, fmt.Errorf("Get error: %s", err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { return nil, fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return nil, fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) } var page Page if !json.Valid(body) { return nil, RequestError{ Err: fmt.Sprintf("Response is not a json"), HTTPCode: response.StatusCode, Body: string(body), } } err = json.Unmarshal(body, &page) if err != nil { return nil, RequestError{ Err: fmt.Sprintf("Page unmarshal error: %s", err), HTTPCode: response.StatusCode, Body: string(body), } } switch page.Name { case "words": var words Words err = json.Unmarshal(body, &words) if err != nil { return nil, fmt.Errorf("Words unmarshal error: %s", err) } return words, nil case "occurrence": var occurrence Occurrence err = json.Unmarshal(body, &occurrence) if err != nil { return nil, fmt.Errorf("Occurrence unmarshal error: %s", err) } return occurrence, nil } return nil, nil } ================================================ FILE: http-get-functions/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/http-get-functions go 1.25.4 ================================================ FILE: http-get-functions/main.go ================================================ package main import ( "encoding/json" "fmt" "io" "net/http" "net/url" "os" "strings" ) type Page struct { Name string `json:"page"` } type Response interface { GetResponse() string } type Words struct { Input string `json:"input"` Words []string `json:"words"` } func (w Words) GetResponse() string { return fmt.Sprintf("Words: %s", strings.Join(w.Words, ", ")) } type Occurrence struct { Words map[string]int `json:"words"` } func (o Occurrence) GetResponse() string { words := []string{} for word, occurrence := range o.Words { words = append(words, fmt.Sprintf("%s (%d)", word, occurrence)) } return fmt.Sprintf("Words: %s", strings.Join(words, ", ")) } func main() { args := os.Args if len(args) < 2 { fmt.Printf("Usage: ./http-get \n") os.Exit(1) } res, err := doRequest(args[1]) if err != nil { fmt.Printf("Error occurred: %s\n", err) os.Exit(1) } if res == nil { fmt.Printf("No response\n") os.Exit(1) } fmt.Printf("Response: %s\n", res.GetResponse()) } func doRequest(requestURL string) (Response, error) { if _, err := url.ParseRequestURI(requestURL); err != nil { fmt.Printf("Usage: ./http-get \n\nURL is not valid URL: %s\n", requestURL) os.Exit(1) } response, err := http.Get(requestURL) if err != nil { return nil, fmt.Errorf("Get error: %s", err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { return nil, fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return nil, fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) } var page Page err = json.Unmarshal(body, &page) if err != nil { return nil, fmt.Errorf("unmarshal error: %s", err) } switch page.Name { case "words": var words Words err = json.Unmarshal(body, &words) if err != nil { return nil, fmt.Errorf("unmarshal error: %s", err) } return words, nil case "occurrence": var occurrence Occurrence err = json.Unmarshal(body, &occurrence) if err != nil { return nil, fmt.Errorf("unmarshal error: %s", err) } return occurrence, nil } return nil, nil } ================================================ FILE: http-get-json/go.mod ================================================ module github.com/wardviaene/go-for-devops-course/http-get-json go 1.25.4 ================================================ FILE: http-get-json/main.go ================================================ package main import ( "encoding/json" "fmt" "io" "log" "net/http" "net/url" "os" "strings" ) type Words struct { Page string `json:"page"` Input string `json:"input"` Words []string `json:"words"` } func main() { args := os.Args if len(args) < 2 { fmt.Printf("Usage: ./http-get \n") os.Exit(1) } if _, err := url.ParseRequestURI(args[1]); err != nil { fmt.Printf("Usage: ./http-get \n\nURL is not valid URL: %s\n", args[1]) os.Exit(1) } response, err := http.Get(args[1]) if err != nil { log.Fatal(err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { log.Fatal(err) } if response.StatusCode != 200 { fmt.Printf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) os.Exit(1) } var words Words err = json.Unmarshal(body, &words) if err != nil { log.Fatal(err) } fmt.Printf("JSON: Parsed:\nPage: %s\nWords: %s\n", words.Page, strings.Join(words.Words, ", ")) } ================================================ FILE: http-get-json-map/go.mod ================================================ module github.com/wardviaene/go-for-devops-course/http-get-json-map go 1.25.4 ================================================ FILE: http-get-json-map/main.go ================================================ package main import ( "encoding/json" "fmt" "io" "log" "net/http" "net/url" "os" "strings" ) type Page struct { Name string `json:"page"` } type Words struct { Input string `json:"input"` Words []string `json:"words"` } type Occurrence struct { Words map[string]int `json:"words"` } func main() { args := os.Args if len(args) < 2 { fmt.Printf("Usage: ./http-get \n") os.Exit(1) } if _, err := url.ParseRequestURI(args[1]); err != nil { fmt.Printf("Usage: ./http-get \n\nURL is not valid URL: %s\n", args[1]) os.Exit(1) } response, err := http.Get(args[1]) if err != nil { log.Fatal(err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { log.Fatal(err) } if response.StatusCode != 200 { fmt.Printf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) os.Exit(1) } var page Page err = json.Unmarshal(body, &page) if err != nil { log.Fatal(err) } switch page.Name { case "words": var words Words err = json.Unmarshal(body, &words) if err != nil { log.Fatal(err) } fmt.Printf("JSON: Parsed:\nPage: %s\nWords: %s\n", page.Name, strings.Join(words.Words, ", ")) case "occurrence": var occurrence Occurrence err = json.Unmarshal(body, &occurrence) if err != nil { log.Fatal(err) } if val, ok := occurrence.Words["word5"]; ok { fmt.Printf("Found word1: %d\n", val) } for word, occurrence := range occurrence.Words { fmt.Printf("%s: %d\n", word, occurrence) } default: fmt.Printf("Page not found\n") } } ================================================ FILE: http-login/error.go ================================================ package main type RequestError struct { Body string HTTPCode int Err string } func (r RequestError) Error() string { return r.Err } ================================================ FILE: http-login/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/http-login go 1.25.4 ================================================ FILE: http-login/login.go ================================================ package main import ( "bytes" "encoding/json" "fmt" "io" "net/http" ) type LoginRequest struct { Password string `json:"password"` } type LoginResponse struct { Token string `json:"token"` } func doLoginRequest(client http.Client, requestURL, password string) (string, error) { loginRequest := LoginRequest{ Password: password, } body, err := json.Marshal(loginRequest) if err != nil { return "", fmt.Errorf("Marshal error: %s", err) } response, err := client.Post(requestURL, "application/json", bytes.NewBuffer(body)) if err != nil { return "", fmt.Errorf("http Post error: %s", err) } defer response.Body.Close() resBody, err := io.ReadAll(response.Body) if err != nil { return "", fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return "", fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(resBody)) } if !json.Valid(resBody) { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: fmt.Sprintf("No valid JSON returned"), } } var loginResponse LoginResponse err = json.Unmarshal(resBody, &loginResponse) if err != nil { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: fmt.Sprintf("Page unmarshal error: %s", err), } } if loginResponse.Token == "" { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: "Empty token replied", } } return loginResponse.Token, nil } ================================================ FILE: http-login/main.go ================================================ package main import ( "encoding/json" "flag" "fmt" "io" "net/http" "net/url" "os" "strings" ) type Page struct { Name string `json:"page"` } type Response interface { GetResponse() string } type Words struct { Input string `json:"input"` Words []string `json:"words"` } func (w Words) GetResponse() string { return fmt.Sprintf("Words: %s", strings.Join(w.Words, ", ")) } type Occurrence struct { Words map[string]int `json:"words"` } func (o Occurrence) GetResponse() string { words := []string{} for word, occurrence := range o.Words { words = append(words, fmt.Sprintf("%s (%d)", word, occurrence)) } return fmt.Sprintf("Words: %s", strings.Join(words, ", ")) } func main() { var ( requestURL string password string parsedURL *url.URL err error ) flag.StringVar(&requestURL, "url", "", "url to access") flag.StringVar(&password, "password", "", "use a password to access our api") flag.Parse() if parsedURL, err = url.ParseRequestURI(requestURL); err != nil { fmt.Printf("Help: ./http-get -h\nURL is not valid URL: %s\n", requestURL) os.Exit(1) } client := http.Client{} if password != "" { token, err := doLoginRequest(client, parsedURL.Scheme+"://"+parsedURL.Host+"/login", password) if err != nil { if requestErr, ok := err.(RequestError); ok { fmt.Printf("Login failed: %s (HTTP Error: %d, Body: %s)\n", requestErr.Error(), requestErr.HTTPCode, requestErr.Body) os.Exit(1) } fmt.Printf("Login failed: %s\n", err) os.Exit(1) } client.Transport = MyJWTTransport{ transport: http.DefaultTransport, token: token, } } res, err := doRequest(client, parsedURL.String()) if err != nil { if requestErr, ok := err.(RequestError); ok { fmt.Printf("Error occurred: %s (HTTP Error: %d, Body: %s)\n", requestErr.Error(), requestErr.HTTPCode, requestErr.Body) os.Exit(1) } fmt.Printf("Error occurred: %s\n", err) os.Exit(1) } if res == nil { fmt.Printf("No response\n") os.Exit(1) } fmt.Printf("Response: %s\n", res.GetResponse()) } func doRequest(client http.Client, requestURL string) (Response, error) { response, err := client.Get(requestURL) if err != nil { return nil, fmt.Errorf("Get error: %s", err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { return nil, fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return nil, fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) } var page Page if !json.Valid(body) { return nil, RequestError{ Err: fmt.Sprintf("Response is not a json"), HTTPCode: response.StatusCode, Body: string(body), } } err = json.Unmarshal(body, &page) if err != nil { return nil, RequestError{ Err: fmt.Sprintf("Page unmarshal error: %s", err), HTTPCode: response.StatusCode, Body: string(body), } } switch page.Name { case "words": var words Words err = json.Unmarshal(body, &words) if err != nil { return nil, fmt.Errorf("Words unmarshal error: %s", err) } return words, nil case "occurrence": var occurrence Occurrence err = json.Unmarshal(body, &occurrence) if err != nil { return nil, fmt.Errorf("Occurrence unmarshal error: %s", err) } return occurrence, nil } return nil, nil } ================================================ FILE: http-login/transport.go ================================================ package main import "net/http" type MyJWTTransport struct { transport http.RoundTripper token string } func (m MyJWTTransport) RoundTrip(req *http.Request) (*http.Response, error) { if m.token != "" { req.Header.Add("Authorization", "Bearer "+m.token) } return m.transport.RoundTrip(req) } ================================================ FILE: http-login-packaged/cmd/http-login/main.go ================================================ package main import ( "flag" "fmt" "net/url" "os" "github.com/wardviaene/golang-for-devops-course/http-login-packaged/pkg/api" ) func main() { var ( requestURL string password string parsedURL *url.URL err error ) flag.StringVar(&requestURL, "url", "", "url to access") flag.StringVar(&password, "password", "", "use a password to access our api") flag.Parse() if parsedURL, err = url.ParseRequestURI(requestURL); err != nil { fmt.Printf("Help: ./http-get -h\nURL is not valid URL: %s\n", requestURL) os.Exit(1) } apiInstance := api.New(api.Options{ Password: password, LoginURL: parsedURL.Scheme + "://" + parsedURL.Host + "/login", }) res, err := apiInstance.DoGetRequest(parsedURL.String()) if err != nil { if requestErr, ok := err.(api.RequestError); ok { fmt.Printf("Error occurred: %s (HTTP Error: %d, Body: %s)\n", requestErr.Error(), requestErr.HTTPCode, requestErr.Body) os.Exit(1) } fmt.Printf("Error occurred: %s\n", err) os.Exit(1) } if res == nil { fmt.Printf("No response\n") os.Exit(1) } fmt.Printf("Response: %s\n", res.GetResponse()) } ================================================ FILE: http-login-packaged/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/http-login-packaged go 1.25.4 ================================================ FILE: http-login-packaged/pkg/api/error.go ================================================ package api type RequestError struct { Body string HTTPCode int Err string } func (r RequestError) Error() string { return r.Err } ================================================ FILE: http-login-packaged/pkg/api/get.go ================================================ package api import ( "encoding/json" "fmt" "io" "strings" ) type Page struct { Name string `json:"page"` } type Response interface { GetResponse() string } type Words struct { Input string `json:"input"` Words []string `json:"words"` } func (w Words) GetResponse() string { return fmt.Sprintf("Words: %s", strings.Join(w.Words, ", ")) } type Occurrence struct { Words map[string]int `json:"words"` } func (o Occurrence) GetResponse() string { words := []string{} for word, occurrence := range o.Words { words = append(words, fmt.Sprintf("%s (%d)", word, occurrence)) } return fmt.Sprintf("Words: %s", strings.Join(words, ", ")) } func (a api) DoGetRequest(requestURL string) (Response, error) { response, err := a.Client.Get(requestURL) if err != nil { return nil, fmt.Errorf("Get error: %s", err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { return nil, fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return nil, fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) } var page Page if !json.Valid(body) { return nil, RequestError{ Err: fmt.Sprintf("Response is not a json"), HTTPCode: response.StatusCode, Body: string(body), } } err = json.Unmarshal(body, &page) if err != nil { return nil, RequestError{ Err: fmt.Sprintf("Page unmarshal error: %s", err), HTTPCode: response.StatusCode, Body: string(body), } } switch page.Name { case "words": var words Words err = json.Unmarshal(body, &words) if err != nil { return nil, fmt.Errorf("Words unmarshal error: %s", err) } return words, nil case "occurrence": var occurrence Occurrence err = json.Unmarshal(body, &occurrence) if err != nil { return nil, fmt.Errorf("Occurrence unmarshal error: %s", err) } return occurrence, nil } return nil, nil } ================================================ FILE: http-login-packaged/pkg/api/init.go ================================================ package api import "net/http" type Options struct { Password string LoginURL string } type APIIface interface { DoGetRequest(requestURL string) (Response, error) } type api struct { Options Options Client http.Client } func New(options Options) APIIface { return api{ Options: options, Client: http.Client{ Transport: &MyJWTTransport{ transport: http.DefaultTransport, password: options.Password, loginURL: options.LoginURL, }, }, } } ================================================ FILE: http-login-packaged/pkg/api/login.go ================================================ package api import ( "bytes" "encoding/json" "fmt" "io" "net/http" ) type LoginRequest struct { Password string `json:"password"` } type LoginResponse struct { Token string `json:"token"` } func doLoginRequest(client http.Client, requestURL, password string) (string, error) { loginRequest := LoginRequest{ Password: password, } body, err := json.Marshal(loginRequest) if err != nil { return "", fmt.Errorf("Marshal error: %s", err) } response, err := client.Post(requestURL, "application/json", bytes.NewBuffer(body)) if err != nil { return "", fmt.Errorf("http Post error: %s", err) } defer response.Body.Close() resBody, err := io.ReadAll(response.Body) if err != nil { return "", fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return "", fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(resBody)) } if !json.Valid(resBody) { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: fmt.Sprintf("No valid JSON returned"), } } var loginResponse LoginResponse err = json.Unmarshal(resBody, &loginResponse) if err != nil { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: fmt.Sprintf("Page unmarshal error: %s", err), } } if loginResponse.Token == "" { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: "Empty token replied", } } return loginResponse.Token, nil } ================================================ FILE: http-login-packaged/pkg/api/transport.go ================================================ package api import ( "net/http" ) type MyJWTTransport struct { transport http.RoundTripper token string password string loginURL string } func (m *MyJWTTransport) RoundTrip(req *http.Request) (*http.Response, error) { if m.token == "" { if m.password != "" { token, err := doLoginRequest(http.Client{}, m.loginURL, m.password) if err != nil { return nil, err } m.token = token } } if m.token != "" { req.Header.Add("Authorization", "Bearer "+m.token) } return m.transport.RoundTrip(req) } ================================================ FILE: http-login-tests/cmd/http-login/main.go ================================================ package main import ( "flag" "fmt" "net/url" "os" "github.com/wardviaene/golang-for-devops-course/http-login-tests/pkg/api" ) func main() { var ( requestURL string password string parsedURL *url.URL err error ) flag.StringVar(&requestURL, "url", "", "url to access") flag.StringVar(&password, "password", "", "use a password to access our api") flag.Parse() if parsedURL, err = url.ParseRequestURI(requestURL); err != nil { fmt.Printf("Help: ./http-get -h\nURL is not valid URL: %s\n", requestURL) os.Exit(1) } apiInstance := api.New(api.Options{ Password: password, LoginURL: parsedURL.Scheme + "://" + parsedURL.Host + "/login", }) res, err := apiInstance.DoGetRequest(parsedURL.String()) if err != nil { if requestErr, ok := err.(api.RequestError); ok { fmt.Printf("Error occurred: %s (HTTP Error: %d, Body: %s)\n", requestErr.Error(), requestErr.HTTPCode, requestErr.Body) os.Exit(1) } fmt.Printf("Error occurred: %s\n", err) os.Exit(1) } if res == nil { fmt.Printf("No response\n") os.Exit(1) } fmt.Printf("Response: %s\n", res.GetResponse()) } ================================================ FILE: http-login-tests/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/http-login-tests go 1.25.4 ================================================ FILE: http-login-tests/pkg/api/error.go ================================================ package api type RequestError struct { Body string HTTPCode int Err string } func (r RequestError) Error() string { return r.Err } ================================================ FILE: http-login-tests/pkg/api/get.go ================================================ package api import ( "encoding/json" "fmt" "io" "strings" ) type Page struct { Name string `json:"page"` } type Response interface { GetResponse() string } type Words struct { Input string `json:"input"` Words []string `json:"words"` } type WordsPage struct { Page Words } func (w Words) GetResponse() string { return fmt.Sprintf("Words: %s", strings.Join(w.Words, ", ")) } type Occurrence struct { Words map[string]int `json:"words"` } func (o Occurrence) GetResponse() string { words := []string{} for word, occurrence := range o.Words { words = append(words, fmt.Sprintf("%s (%d)", word, occurrence)) } return fmt.Sprintf("Words: %s", strings.Join(words, ", ")) } func (a api) DoGetRequest(requestURL string) (Response, error) { response, err := a.Client.Get(requestURL) if err != nil { return nil, fmt.Errorf("Get error: %s", err) } defer response.Body.Close() body, err := io.ReadAll(response.Body) if err != nil { return nil, fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return nil, fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(body)) } var page Page if !json.Valid(body) { return nil, RequestError{ Err: fmt.Sprintf("Response is not a json"), HTTPCode: response.StatusCode, Body: string(body), } } err = json.Unmarshal(body, &page) if err != nil { return nil, RequestError{ Err: fmt.Sprintf("Page unmarshal error: %s", err), HTTPCode: response.StatusCode, Body: string(body), } } switch page.Name { case "words": var words Words err = json.Unmarshal(body, &words) if err != nil { return nil, fmt.Errorf("Words unmarshal error: %s", err) } return words, nil case "occurrence": var occurrence Occurrence err = json.Unmarshal(body, &occurrence) if err != nil { return nil, fmt.Errorf("Occurrence unmarshal error: %s", err) } return occurrence, nil } return nil, nil } ================================================ FILE: http-login-tests/pkg/api/get_test.go ================================================ package api import ( "bytes" "encoding/json" "fmt" "io" "net/http" "testing" ) type MockClient struct { GetResponse *http.Response PostResponse *http.Response } func (m MockClient) Get(url string) (resp *http.Response, err error) { if url == "http://localhost/login" { fmt.Printf("Login endpoint") } return m.GetResponse, nil } func (m MockClient) Post(url string, contentType string, body io.Reader) (resp *http.Response, err error) { return m.PostResponse, nil } func TestDoGetRequest(t *testing.T) { words := WordsPage{ Page: Page{"words"}, Words: Words{ Input: "abc", Words: []string{"a", "b"}, }, } wordsBytes, err := json.Marshal(words) if err != nil { t.Errorf("marshal error: %s", err) } apiInstance := api{ Options: Options{}, Client: MockClient{ GetResponse: &http.Response{ StatusCode: 200, Body: io.NopCloser(bytes.NewReader(wordsBytes)), }, }, } response, err := apiInstance.DoGetRequest("http://localhost/words") if err != nil { t.Errorf("DoGetRequest error: %s", err) } if response == nil { t.Errorf("Response is nil") } if response.GetResponse() != `Words: a, b` { t.Errorf("Got wrong output: %s", response.GetResponse()) } } ================================================ FILE: http-login-tests/pkg/api/init.go ================================================ package api import ( "io" "net/http" ) type Options struct { Password string LoginURL string } type ClientIface interface { Get(url string) (resp *http.Response, err error) Post(url string, contentType string, body io.Reader) (resp *http.Response, err error) } type APIIface interface { DoGetRequest(requestURL string) (Response, error) } type api struct { Options Options Client ClientIface } func New(options Options) APIIface { return api{ Options: options, Client: &http.Client{ Transport: MyJWTTransport{ transport: http.DefaultTransport, password: options.Password, loginURL: options.LoginURL, HTTPClient: &http.Client{}, }, }, } } ================================================ FILE: http-login-tests/pkg/api/login.go ================================================ package api import ( "bytes" "encoding/json" "fmt" "io" ) type LoginRequest struct { Password string `json:"password"` } type LoginResponse struct { Token string `json:"token"` } func doLoginRequest(client ClientIface, requestURL, password string) (string, error) { loginRequest := LoginRequest{ Password: password, } body, err := json.Marshal(loginRequest) if err != nil { return "", fmt.Errorf("Marshal error: %s", err) } response, err := client.Post(requestURL, "application/json", bytes.NewBuffer(body)) if err != nil { return "", fmt.Errorf("http Post error: %s", err) } defer response.Body.Close() resBody, err := io.ReadAll(response.Body) if err != nil { return "", fmt.Errorf("ReadAll error: %s", err) } if response.StatusCode != 200 { return "", fmt.Errorf("Invalid output (HTTP Code %d): %s\n", response.StatusCode, string(resBody)) } if !json.Valid(resBody) { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: fmt.Sprintf("No valid JSON returned"), } } var loginResponse LoginResponse err = json.Unmarshal(resBody, &loginResponse) if err != nil { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: fmt.Sprintf("Page unmarshal error: %s", err), } } if loginResponse.Token == "" { return "", RequestError{ HTTPCode: response.StatusCode, Body: string(resBody), Err: "Empty token replied", } } return loginResponse.Token, nil } ================================================ FILE: http-login-tests/pkg/api/transport.go ================================================ package api import ( "net/http" ) type MyJWTTransport struct { transport http.RoundTripper token string password string loginURL string HTTPClient ClientIface } func (m MyJWTTransport) RoundTrip(req *http.Request) (*http.Response, error) { if m.token == "" { if m.password != "" { token, err := doLoginRequest(m.HTTPClient, m.loginURL, m.password) if err != nil { return nil, err } m.token = token } } if m.token != "" { req.Header.Add("Authorization", "Bearer "+m.token) } return m.transport.RoundTrip(req) } ================================================ FILE: http-login-tests/pkg/api/transport_test.go ================================================ package api import ( "bytes" "encoding/json" "fmt" "io" "net/http" "testing" ) type MockRoundTripper struct { RoundTripOutput *http.Response } func (m MockRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) { if req.Header.Get("Authorization") != "Bearer 123" { return nil, fmt.Errorf("wrong Authorization header: %s", req.Header.Get("Authorization")) } return m.RoundTripOutput, nil } func TestRoundtrip(t *testing.T) { loginResponse := LoginResponse{ Token: "123", } loginResponseBytes, err := json.Marshal(loginResponse) if err != nil { t.Errorf("marshal error: %s", err) } jwtTransport := MyJWTTransport{ HTTPClient: MockClient{ PostResponse: &http.Response{ StatusCode: 200, Body: io.NopCloser(bytes.NewReader(loginResponseBytes)), }, }, transport: MockRoundTripper{ RoundTripOutput: &http.Response{ StatusCode: 200, }, }, password: "xyz", } req := &http.Request{ Header: make(http.Header), } res, err := jwtTransport.RoundTrip(req) if err != nil { t.Errorf("got error: %s", err) t.FailNow() } if res.StatusCode != 200 { t.Errorf("expected status code 200, got %d", res.StatusCode) } } ================================================ FILE: kubernetes-deploy/app.yaml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: helloworld-deployment spec: replicas: 1 selector: matchLabels: app: helloworld template: metadata: labels: app: helloworld spec: containers: - name: k8s-demo image: wardviaene/k8s-demo ports: - name: nodejs-port containerPort: 3000 ================================================ FILE: kubernetes-deploy/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/kubernetes-deploy go 1.25.4 replace github.com/golang/mock => github.com/golang/mock v1.4.4 require ( k8s.io/api v0.24.1 k8s.io/apimachinery v0.24.1 k8s.io/client-go v0.24.1 ) require ( github.com/PuerkitoBio/purell v1.1.1 // indirect github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect github.com/davecgh/go-spew v1.1.1 // indirect github.com/emicklei/go-restful v2.16.0+incompatible // indirect github.com/go-logr/logr v1.2.0 // indirect github.com/go-openapi/jsonpointer v0.19.5 // indirect github.com/go-openapi/jsonreference v0.19.5 // indirect github.com/go-openapi/swag v0.19.14 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang/protobuf v1.5.2 // indirect github.com/google/gnostic v0.5.7-v3refs // indirect github.com/google/gofuzz v1.1.0 // indirect github.com/imdario/mergo v0.3.5 // indirect github.com/josharian/intern v1.0.0 // indirect github.com/json-iterator/go v1.1.12 // indirect github.com/mailru/easyjson v0.7.6 // indirect github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect github.com/modern-go/reflect2 v1.0.2 // indirect github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect github.com/spf13/pflag v1.0.5 // indirect golang.org/x/net v0.38.0 // indirect golang.org/x/oauth2 v0.33.0 // indirect golang.org/x/sys v0.31.0 // indirect golang.org/x/term v0.30.0 // indirect golang.org/x/text v0.23.0 // indirect golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect google.golang.org/protobuf v1.33.0 // indirect gopkg.in/inf.v0 v0.9.1 // indirect gopkg.in/yaml.v2 v2.4.0 // indirect gopkg.in/yaml.v3 v3.0.1 // indirect k8s.io/klog/v2 v2.60.1 // indirect k8s.io/kube-openapi v0.0.0-20220328201542-3ee0da9b0b42 // indirect k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 // indirect sigs.k8s.io/json v0.0.0-20211208200746-9f7c6b3444d2 // indirect sigs.k8s.io/structured-merge-diff/v4 v4.2.1 // indirect sigs.k8s.io/yaml v1.2.0 // indirect ) ================================================ FILE: kubernetes-deploy/go.sum ================================================ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0= cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To= cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4= cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M= cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc= cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk= cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs= cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc= cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY= cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI= cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk= cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg= cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8= cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0= cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o= cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE= cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc= cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg= cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc= cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ= cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE= cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk= cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I= cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw= cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA= cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU= cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw= cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos= cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk= cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs= cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0= dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU= github.com/Azure/go-autorest v14.2.0+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24= github.com/Azure/go-autorest/autorest v0.11.18/go.mod h1:dSiJPy22c3u0OtOKDNttNgqpNFY/GeWa7GH/Pz56QRA= github.com/Azure/go-autorest/autorest/adal v0.9.13/go.mod h1:W/MM4U6nLxnIskrw4UwWzlHfGjwUS50aOsc/I3yuU8M= github.com/Azure/go-autorest/autorest/date v0.3.0/go.mod h1:BI0uouVdmngYNUzGWeSYnokU+TrmwEsOqdt8Y6sso74= github.com/Azure/go-autorest/autorest/mocks v0.4.1/go.mod h1:LTp+uSrOhSkaKrUy935gNZuuIPPVsHlr9DSOxSayd+k= github.com/Azure/go-autorest/logger v0.2.1/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8= 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h1:JhoOvNiLXKTPQ60zh2g0ewpA+bnEYf5q44Flhquh4vQ= k8s.io/apimachinery v0.24.1 h1:ShD4aDxTQKN5zNf8K1RQ2u98ELLdIW7jEnlO9uAMX/I= k8s.io/apimachinery v0.24.1/go.mod h1:82Bi4sCzVBdpYjyI4jY6aHX+YCUchUIrZrXKedjd2UM= k8s.io/client-go v0.24.1 h1:w1hNdI9PFrzu3OlovVeTnf4oHDt+FJLd9Ndluvnb42E= k8s.io/client-go v0.24.1/go.mod h1:f1kIDqcEYmwXS/vTbbhopMUbhKp2JhOeVTfxgaCIlF8= k8s.io/gengo v0.0.0-20210813121822-485abfe95c7c/go.mod h1:FiNAH4ZV3gBg2Kwh89tzAEV2be7d5xI0vBa/VySYy3E= k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE= k8s.io/klog/v2 v2.2.0/go.mod h1:Od+F08eJP+W3HUb4pSrPpgp9DGU4GzlpG/TmITuYh/Y= k8s.io/klog/v2 v2.60.1 h1:VW25q3bZx9uE3vvdL6M8ezOX79vA2Aq1nEWLqNQclHc= k8s.io/klog/v2 v2.60.1/go.mod h1:y1WjHnz7Dj687irZUWR/WLkLc5N1YHtjLdmgWjndZn0= k8s.io/kube-openapi v0.0.0-20220328201542-3ee0da9b0b42 h1:Gii5eqf+GmIEwGNKQYQClCayuJCe2/4fZUvF7VG99sU= k8s.io/kube-openapi v0.0.0-20220328201542-3ee0da9b0b42/go.mod h1:Z/45zLw8lUo4wdiUkI+v/ImEGAvu3WatcZl3lPMR4Rk= k8s.io/utils v0.0.0-20210802155522-efc7438f0176/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA= k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 h1:HNSDgDCrr/6Ly3WEGKZftiE7IY19Vz2GdbOCyI4qqhc= k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA= rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= sigs.k8s.io/json v0.0.0-20211208200746-9f7c6b3444d2 h1:kDi4JBNAsJWfz1aEXhO8Jg87JJaPNLh5tIzYHgStQ9Y= sigs.k8s.io/json v0.0.0-20211208200746-9f7c6b3444d2/go.mod h1:B+TnT182UBxE84DiCz4CVE26eOSDAeYCpfDnC2kdKMY= sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw= sigs.k8s.io/structured-merge-diff/v4 v4.2.1 h1:bKCqE9GvQ5tiVHn5rfn1r+yao3aLQEaLzkkmAkf+A6Y= sigs.k8s.io/structured-merge-diff/v4 v4.2.1/go.mod h1:j/nl6xW8vLS49O8YvXW1ocPhZawJtm+Yrr7PPRQ0Vg4= sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q= sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= ================================================ FILE: kubernetes-deploy/main.go ================================================ package main import ( "context" "fmt" "io/ioutil" "os" "path/filepath" "time" v1 "k8s.io/api/apps/v1" "k8s.io/apimachinery/pkg/api/errors" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/labels" "k8s.io/client-go/kubernetes" "k8s.io/client-go/kubernetes/scheme" "k8s.io/client-go/tools/clientcmd" "k8s.io/client-go/util/homedir" ) func main() { var ( client *kubernetes.Clientset deploymentLabels map[string]string err error expectedPods int32 ) ctx := context.Background() if client, err = getClient(); err != nil { fmt.Printf("Error: %s", err) os.Exit(1) } if deploymentLabels, expectedPods, err = deploy(ctx, client); err != nil { fmt.Printf("Error: %s", err) os.Exit(1) } if err = waitForPods(ctx, client, deploymentLabels, expectedPods); err != nil { fmt.Printf("Error: %s", err) os.Exit(1) } fmt.Printf("deploy finished. Did a deploy with labels: %+v\n", deploymentLabels) } func getClient() (*kubernetes.Clientset, error) { // use the current context in kubeconfig config, err := clientcmd.BuildConfigFromFlags("", filepath.Join(homedir.HomeDir(), ".kube", "config")) if err != nil { return nil, err } // create the clientset clientset, err := kubernetes.NewForConfig(config) if err != nil { return nil, err } return clientset, nil } func deploy(ctx context.Context, client *kubernetes.Clientset) (map[string]string, int32, error) { var deployment *v1.Deployment appFile, err := ioutil.ReadFile("app.yaml") if err != nil { return nil, 0, fmt.Errorf("readfile error: %s", err) } obj, groupVersionKind, err := scheme.Codecs.UniversalDeserializer().Decode(appFile, nil, nil) if err != nil { return nil, 0, fmt.Errorf("Decode error: %s", err) } switch obj.(type) { case *v1.Deployment: deployment = obj.(*v1.Deployment) default: return nil, 0, fmt.Errorf("Unrecognized type: %s\n", groupVersionKind) } _, err = client.AppsV1().Deployments("default").Get(ctx, deployment.Name, metav1.GetOptions{}) if err != nil && errors.IsNotFound(err) { deploymentResponse, err := client.AppsV1().Deployments("default").Create(ctx, deployment, metav1.CreateOptions{}) if err != nil { return nil, 0, fmt.Errorf("deployment error: %s", err) } return deploymentResponse.Spec.Template.Labels, *deploymentResponse.Spec.Replicas, nil } else if err != nil && !errors.IsNotFound(err) { return nil, 0, fmt.Errorf("deployment get error: %s", err) } deploymentResponse, err := client.AppsV1().Deployments("default").Update(ctx, deployment, metav1.UpdateOptions{}) if err != nil { return nil, 0, fmt.Errorf("deployment error: %s", err) } return deploymentResponse.Spec.Template.Labels, *deploymentResponse.Spec.Replicas, nil } func waitForPods(ctx context.Context, client *kubernetes.Clientset, deploymentLabels map[string]string, expectedPods int32) error { for { validatedLabels, err := labels.ValidatedSelectorFromSet(deploymentLabels) if err != nil { return fmt.Errorf("ValidatedSelectorFromSet error: %s", err) } podList, err := client.CoreV1().Pods("default").List(ctx, metav1.ListOptions{ LabelSelector: validatedLabels.String(), }) if err != nil { return fmt.Errorf("pod list error: %s", err) } podsRunning := 0 for _, pod := range podList.Items { if pod.Status.Phase == "Running" { podsRunning++ } } fmt.Printf("Waiting for pods to become ready (running %d / %d)\n", podsRunning, len(podList.Items)) if podsRunning > 0 && podsRunning == len(podList.Items) && podsRunning == int(expectedPods) { break } time.Sleep(5 * time.Second) } return nil } ================================================ FILE: kubernetes-deploy-github/.dockerignore ================================================ .git *.yaml ================================================ FILE: kubernetes-deploy-github/Dockerfile ================================================ # # Build go project # FROM golang:1.18-alpine as go-builder WORKDIR /github-deploy COPY . . RUN apk add -u -t build-tools curl git && \ CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o github-deploy . && \ apk del build-tools && \ rm -rf /var/cache/apk/* # # Runtime container # FROM alpine:latest WORKDIR /app RUN apk --no-cache add ca-certificates bash curl COPY --from=go-builder /github-deploy/github-deploy /github-deploy ENTRYPOINT ["/github-deploy"] ================================================ FILE: kubernetes-deploy-github/README.md ================================================ # GitHub Deploy ## Create secret ``` kubectl create secret generic github-deploy --from-literal=webhook-secret=mysecret --from-literal=github-token=token ``` ================================================ FILE: kubernetes-deploy-github/deploy.yaml ================================================ apiVersion: apps/v1 kind: Deployment metadata: name: github-deploy spec: replicas: 1 selector: matchLabels: app: github-deploy template: metadata: labels: app: github-deploy spec: serviceAccountName: github-deploy containers: - name: github-deploy image: wardviaene/github-deploy ports: - name: http-port containerPort: 8080 env: - name: GITHUB_TOKEN valueFrom: secretKeyRef: name: github-deploy key: github-token optional: false - name: WEBHOOK_SECRET valueFrom: secretKeyRef: name: github-deploy key: webhook-secret optional: false --- apiVersion: v1 kind: Service metadata: name: github-deploy spec: ports: - port: 8080 protocol: TCP selector: app: github-deploy type: LoadBalancer --- apiVersion: v1 kind: ServiceAccount metadata: name: github-deploy --- apiVersion: rbac.authorization.k8s.io/v1 kind: Role metadata: namespace: default name: github-deploy rules: - apiGroups: ["apps"] resources: ["deployments"] verbs: ["get", "list", "watch", "create", "update", "patch", "delete"] --- apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: github-deploy namespace: default subjects: - kind: ServiceAccount name: github-deploy namespace: default roleRef: kind: Role name: github-deploy apiGroup: rbac.authorization.k8s.io ================================================ FILE: kubernetes-deploy-github/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/kubernetes-deploy-github go 1.25.4 replace github.com/golang/mock => github.com/golang/mock v1.4.4 require ( github.com/google/go-github/v45 v45.0.0 golang.org/x/oauth2 v0.27.0 k8s.io/api v0.24.1 k8s.io/apimachinery v0.24.1 k8s.io/client-go v0.24.1 ) require ( github.com/PuerkitoBio/purell v1.1.1 // indirect github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 // indirect github.com/davecgh/go-spew v1.1.1 // indirect github.com/emicklei/go-restful v2.16.0+incompatible // indirect github.com/go-logr/logr v1.2.0 // indirect github.com/go-openapi/jsonpointer v0.19.5 // indirect github.com/go-openapi/jsonreference v0.19.5 // indirect github.com/go-openapi/swag v0.19.14 // indirect github.com/gogo/protobuf v1.3.2 // indirect github.com/golang/protobuf v1.5.2 // indirect github.com/google/gnostic v0.5.7-v3refs // indirect github.com/google/go-querystring v1.1.0 // indirect github.com/google/gofuzz v1.1.0 // indirect github.com/imdario/mergo v0.3.5 // indirect github.com/josharian/intern v1.0.0 // indirect github.com/json-iterator/go v1.1.12 // indirect github.com/mailru/easyjson v0.7.6 // indirect github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect github.com/modern-go/reflect2 v1.0.2 // indirect github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect github.com/spf13/pflag v1.0.5 // indirect golang.org/x/crypto v0.45.0 // indirect golang.org/x/net v0.47.0 // indirect golang.org/x/sys v0.38.0 // indirect golang.org/x/term v0.37.0 // indirect golang.org/x/text v0.31.0 // indirect golang.org/x/time v0.0.0-20220210224613-90d013bbcef8 // indirect google.golang.org/protobuf v1.33.0 // indirect gopkg.in/inf.v0 v0.9.1 // indirect gopkg.in/yaml.v2 v2.4.0 // indirect gopkg.in/yaml.v3 v3.0.1 // indirect k8s.io/klog/v2 v2.60.1 // indirect k8s.io/kube-openapi v0.0.0-20220328201542-3ee0da9b0b42 // indirect k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 // indirect sigs.k8s.io/json v0.0.0-20211208200746-9f7c6b3444d2 // indirect sigs.k8s.io/structured-merge-diff/v4 v4.2.1 // indirect sigs.k8s.io/yaml v1.2.0 // indirect ) ================================================ FILE: kubernetes-deploy-github/go.sum ================================================ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU= cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU= cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY= cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc= 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h1:j/nl6xW8vLS49O8YvXW1ocPhZawJtm+Yrr7PPRQ0Vg4= sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q= sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc= ================================================ FILE: kubernetes-deploy-github/main.go ================================================ package main import ( "context" "fmt" "net/http" "os" "path/filepath" "time" "github.com/google/go-github/v45/github" "golang.org/x/oauth2" v1 "k8s.io/api/apps/v1" "k8s.io/apimachinery/pkg/api/errors" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/labels" "k8s.io/client-go/kubernetes" "k8s.io/client-go/kubernetes/scheme" "k8s.io/client-go/rest" "k8s.io/client-go/tools/clientcmd" "k8s.io/client-go/util/homedir" ) func main() { var ( client *kubernetes.Clientset err error ) ctx := context.Background() if client, err = getClient(ctx, false); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } serverInstance := server{ client: client, webhookSecretKey: os.Getenv("WEBHOOK_SECRET"), githubClient: getGitHubClient(ctx, os.Getenv("GITHUB_TOKEN")), } http.HandleFunc("/webhook", serverInstance.webhook) err = http.ListenAndServe(":8080", nil) fmt.Printf("Exited: %s\n", err) } func getClient(ctx context.Context, inCluster bool) (*kubernetes.Clientset, error) { var ( config *rest.Config err error ) if inCluster { config, err = rest.InClusterConfig() if err != nil { return nil, err } } else { kubeConfigPath := filepath.Join(homedir.HomeDir(), ".kube", "config") config, err = clientcmd.BuildConfigFromFlags("", kubeConfigPath) if err != nil { return nil, err } } client, err := kubernetes.NewForConfig(config) if err != nil { return nil, err } return client, nil } func getGitHubClient(ctx context.Context, token string) *github.Client { if token == "" { return github.NewClient(nil) } ts := oauth2.StaticTokenSource( &oauth2.Token{AccessToken: token}, ) tc := oauth2.NewClient(ctx, ts) return github.NewClient(tc) } func deploy(ctx context.Context, client *kubernetes.Clientset, appFile []byte) (map[string]string, int32, error) { var deployment *v1.Deployment obj, groupVersionKind, err := scheme.Codecs.UniversalDeserializer().Decode(appFile, nil, nil) if err != nil { return nil, 0, fmt.Errorf("Decode error: %s", err) } switch obj.(type) { case *v1.Deployment: deployment = obj.(*v1.Deployment) default: return nil, 0, fmt.Errorf("Unrecognized type: %s\n", groupVersionKind) } _, err = client.AppsV1().Deployments("default").Get(ctx, deployment.Name, metav1.GetOptions{}) if err != nil && errors.IsNotFound(err) { deploymentResponse, err := client.AppsV1().Deployments("default").Create(ctx, deployment, metav1.CreateOptions{}) if err != nil { return nil, 0, fmt.Errorf("deployment error: %s", err) } return deploymentResponse.Spec.Template.Labels, *deploymentResponse.Spec.Replicas, nil } else if err != nil && !errors.IsNotFound(err) { return nil, 0, fmt.Errorf("deployment get error: %s", err) } deploymentResponse, err := client.AppsV1().Deployments("default").Update(ctx, deployment, metav1.UpdateOptions{}) if err != nil { return nil, 0, fmt.Errorf("deployment error: %s", err) } return deploymentResponse.Spec.Template.Labels, *deploymentResponse.Spec.Replicas, nil } func waitForPods(ctx context.Context, client *kubernetes.Clientset, deploymentLabels map[string]string, expectedPods int32) error { for { validatedLabels, err := labels.ValidatedSelectorFromSet(deploymentLabels) if err != nil { return fmt.Errorf("ValidatedSelectorFromSet error: %s", err) } podList, err := client.CoreV1().Pods("default").List(ctx, metav1.ListOptions{ LabelSelector: validatedLabels.String(), }) if err != nil { return fmt.Errorf("pod list error: %s", err) } podsRunning := 0 for _, pod := range podList.Items { if pod.Status.Phase == "Running" { podsRunning++ } } fmt.Printf("Waiting for pods to become ready (running %d / %d)\n", podsRunning, len(podList.Items)) if podsRunning > 0 && podsRunning == len(podList.Items) && podsRunning == int(expectedPods) { break } time.Sleep(5 * time.Second) } return nil } ================================================ FILE: kubernetes-deploy-github/server.go ================================================ package main import ( "context" "fmt" "io" "net/http" "strings" "github.com/google/go-github/v45/github" "k8s.io/client-go/kubernetes" ) type server struct { client *kubernetes.Clientset githubClient *github.Client webhookSecretKey string } func (s server) webhook(w http.ResponseWriter, req *http.Request) { ctx := context.Background() payload, err := github.ValidatePayload(req, []byte(s.webhookSecretKey)) if err != nil { w.WriteHeader(500) fmt.Printf("ValidatePayload error: %s", err) return } event, err := github.ParseWebHook(github.WebHookType(req), payload) if err != nil { w.WriteHeader(500) fmt.Printf("ValidatePayload error: %s", err) return } switch event := event.(type) { case *github.Hook: fmt.Printf("Hook is created\n") case *github.PushEvent: files := getFiles(event.Commits) fmt.Printf("Found files: %s\n", strings.Join(files, ", ")) for _, filename := range files { downloadedFile, _, err := s.githubClient.Repositories.DownloadContents(ctx, *event.Repo.Owner.Name, *event.Repo.Name, filename, &github.RepositoryContentGetOptions{}) if err != nil { w.WriteHeader(500) fmt.Printf("DownloadContents error: %s", err) return } defer downloadedFile.Close() fileBody, err := io.ReadAll(downloadedFile) if err != nil { w.WriteHeader(500) fmt.Printf("ReadAll error: %s", err) return } _, _, err = deploy(ctx, s.client, fileBody) if err != nil { w.WriteHeader(500) fmt.Printf("deploy error: %s", err) return } fmt.Printf("Deploy of %s finished\n", filename) } default: w.WriteHeader(500) fmt.Printf("Event not found: %s", event) return } } func getFiles(commits []*github.HeadCommit) []string { allFiles := []string{} for _, commit := range commits { allFiles = append(allFiles, commit.Added...) allFiles = append(allFiles, commit.Modified...) } allUniqueFiles := make(map[string]bool) for _, filename := range allFiles { allUniqueFiles[filename] = true } allUniqueFilesSlice := []string{} for filename := range allUniqueFiles { allUniqueFilesSlice = append(allUniqueFilesSlice, filename) } return allUniqueFilesSlice } ================================================ FILE: kubernetes-deploy-github/server_test.go ================================================ package main import ( "strings" "testing" "github.com/google/go-github/v45/github" ) func TestGetFiles(t *testing.T) { files := getFiles([]*github.HeadCommit{ { Added: []string{"test.txt"}, }, }) if len(files) != 1 { t.Fatalf("len files is not 1. Got: %v", strings.Join(files, ",")) } if files[0] != "test.txt" { t.Fatalf("first element is not test.txt. Got: %s", files[0]) } } ================================================ FILE: mutex-demo/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/mutex-demo go 1.25.4 ================================================ FILE: mutex-demo/main.go ================================================ package main import ( "fmt" "math/rand" "sync" "time" ) type mytype struct { counter int mu sync.Mutex } func main() { mytypeInstance := mytype{} finished := make(chan bool) for i := 0; i < 10; i++ { go func(mytypeInstance *mytype) { mytypeInstance.mu.Lock() fmt.Printf("input counter: %d\n", mytypeInstance.counter) mytypeInstance.counter++ time.Sleep(time.Duration(rand.Intn(5)) * time.Second) if mytypeInstance.counter == 5 { fmt.Printf("Found counter == 5\n") } fmt.Printf("output counter: %d\n", mytypeInstance.counter) finished <- true mytypeInstance.mu.Unlock() }(&mytypeInstance) } for i := 0; i < 10; i++ { <-finished } fmt.Printf("Counter: %d\n", mytypeInstance.counter) } ================================================ FILE: oidc-demo/.gitignore ================================================ *.pem ================================================ FILE: oidc-demo/Dockerfile ================================================ # # Build go project # FROM golang:1.18-alpine as go-builder WORKDIR /oidc-demo COPY . . RUN apk add -u -t build-tools curl git && \ CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o server cmd/server/*.go && \ apk del build-tools && \ rm -rf /var/cache/apk/* # # Runtime container # FROM alpine:latest WORKDIR /app RUN apk --no-cache add ca-certificates bash curl COPY --from=go-builder /oidc-demo/server /app/oidc-demo-server COPY config.yaml /app/config.yaml ENTRYPOINT ["/app/oidc-demo-server"] ================================================ FILE: oidc-demo/cmd/appserver/jwt.go ================================================ package main import ( "crypto/rsa" "encoding/base64" "encoding/json" "fmt" "io" "math/big" "net/http" "net/url" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) // gets token from tokenUrl validating token with jwksUrl and returning token & claims func getTokenFromCode(tokenUrl, jwksUrl, redirectUri, clientID, clientSecret, code string) ([]*jwt.Token, *jwt.RegisteredClaims, error) { values := url.Values{} values.Add("grant_type", "authorization_code") values.Add("client_id", clientID) values.Add("client_secret", clientSecret) values.Add("redirect_uri", redirectUri) values.Add("code", code) res, err := http.PostForm(tokenUrl, values) if err != nil { return nil, nil, err } defer res.Body.Close() body, err := io.ReadAll(res.Body) if err != nil { return nil, nil, err } if res.StatusCode != 200 { return nil, nil, fmt.Errorf("Statuscode was not 200.") } var token oidc.Token err = json.Unmarshal(body, &token) if err != nil { return nil, nil, fmt.Errorf("Unmarshal token error: %s", err) } claims := &jwt.RegisteredClaims{} parsedIDToken, err := jwt.ParseWithClaims(token.IDToken, claims, func(token *jwt.Token) (interface{}, error) { kid, ok := token.Header["kid"] if !ok { return nil, fmt.Errorf("kid not found") } publicKey, err := getPublicKeyFromJwks(jwksUrl, kid.(string)) if err != nil { return nil, fmt.Errorf("getPublicKeyFromJwks error: %s", err) } return publicKey, nil }) if err != nil { return nil, nil, fmt.Errorf("Token parsing failed: %s", err) } AccessTokenClaims := &jwt.RegisteredClaims{} parsedAccessToken, err := jwt.ParseWithClaims(token.AccessToken, AccessTokenClaims, func(token *jwt.Token) (interface{}, error) { kid, ok := token.Header["kid"] if !ok { return nil, fmt.Errorf("kid not found") } publicKey, err := getPublicKeyFromJwks(jwksUrl, kid.(string)) if err != nil { return nil, fmt.Errorf("getPublicKeyFromJwks error: %s", err) } return publicKey, nil }) if err != nil { return nil, nil, fmt.Errorf("Token parsing failed: %s", err) } return []*jwt.Token{parsedIDToken, parsedAccessToken}, claims, nil } func getPublicKeyFromJwks(jwksUrl string, kid string) (*rsa.PublicKey, error) { res, err := http.Get(jwksUrl) if err != nil { return nil, err } defer res.Body.Close() body, err := io.ReadAll(res.Body) if err != nil { return nil, err } if res.StatusCode != 200 { return nil, fmt.Errorf("invalid statusCode: %d", res.StatusCode) } // parse jwks var jwks oidc.Jwks err = json.Unmarshal(body, &jwks) if err != nil { return nil, err } for _, jwksKeyEntry := range jwks.Keys { if jwksKeyEntry.Kid == kid { nBytes, err := base64.StdEncoding.DecodeString(jwksKeyEntry.N) if err != nil { return nil, fmt.Errorf("decodestring error: %s", err) } n := big.NewInt(0) n.SetBytes(nBytes) return &rsa.PublicKey{ N: n, E: 65537, }, nil } } return nil, fmt.Errorf("No public key found with kid %s", kid) } ================================================ FILE: oidc-demo/cmd/appserver/jwt_test.go ================================================ package main import ( "crypto/rand" "crypto/rsa" "encoding/base64" "encoding/json" "fmt" "net/http" "net/http/httptest" "testing" "time" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) func TestGetTokenFromCode(t *testing.T) { // generate private key privateKey, err := rsa.GenerateKey(rand.Reader, 4096) if err != nil { t.Fatalf("Couldn't generate rsa key") } ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { // generate jwt and return if r.URL.Path == "/token" { claims := jwt.MapClaims{ "iss": "http://example.com", "sub": "1-2-3-5", "aud": "1-2-3-4", "exp": time.Now().Add(1 * time.Hour).Unix(), "iat": time.Now().Unix(), } token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims) token.Header["kid"] = "0-0-0-1" idTokenString, err := token.SignedString(privateKey) if err != nil { t.Fatalf("SignedString: %s", err) } // generate Access Token claims = jwt.MapClaims{ "iss": "http://example.com", "sub": "1-2-3-4", "aud": []string{ "http://example.com/userinfo", }, "exp": time.Now().Add(1 * time.Hour).Unix(), "iat": time.Now().Unix(), } token = jwt.NewWithClaims(jwt.SigningMethodRS256, claims) token.Header["kid"] = "0-0-0-1" accessTokenString, err := token.SignedString(privateKey) if err != nil { t.Fatalf("SignedString: %s", err) } refreshToken, err := oidc.GetRandomString(64) if err != nil { t.Fatalf("random string error: %s", err) } responseToken := oidc.Token{ IDToken: idTokenString, AccessToken: accessTokenString, ExpiresIn: 60, TokenType: "bearer", RefreshToken: refreshToken, } out, err := json.Marshal(responseToken) if err != nil { t.Fatalf("json marshal error: %s", err) return } w.Write(out) } else if r.URL.Path == "/jwks.json" { jwks := oidc.Jwks{ Keys: []oidc.JwksKey{ { N: base64.StdEncoding.EncodeToString(privateKey.PublicKey.N.Bytes()), E: "AQAB", Alg: "RS256", Use: "sig", Kid: "0-0-0-1", Kty: "RSA", }, }, } out, err := json.Marshal(jwks) if err != nil { t.Fatalf("jwks marshall error: %s", err) return } w.Write(out) } })) defer ts.Close() _, claims, err := getTokenFromCode(ts.URL+"/token", ts.URL+"/jwks.json", "http://localhost:8081", "1-2-3-4", "secret", "mycode") if err != nil { t.Fatalf("getTokenFromCode error: %s", err) } if claims == nil { t.Fatalf("claims is nil") } fmt.Printf("Exchanged code into token. Subject: %s\n", claims.Subject) } ================================================ FILE: oidc-demo/cmd/appserver/main.go ================================================ package main import ( "fmt" "io" "net/http" "os" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) const redirectUri = "http://localhost:8081/callback" type app struct { states map[string]bool } func main() { a := app{ states: make(map[string]bool), } http.HandleFunc("/", a.index) http.HandleFunc("/callback", a.callback) err := http.ListenAndServe(":8081", nil) if err != nil { fmt.Printf("ListenAndServe error: %s\n", err) } } func (a *app) index(w http.ResponseWriter, r *http.Request) { oidcEndpoint := os.Getenv("OIDC_ENDPOINT") discovery, err := oidc.ParseDiscovery(oidcEndpoint + "/.well-known/openid-configuration") if err != nil { returnError(w, fmt.Errorf("ParseDiscovery error: %s", err)) return } state, err := oidc.GetRandomString(64) if err != nil { returnError(w, fmt.Errorf("GetRandomString error: %s", err)) return } a.states[state] = true authorizationURL := fmt.Sprintf("%s?client_id=%s&redirect_uri=%s&scope=openid&response_type=code&state=%s", discovery.AuthorizationEndpoint, os.Getenv("CLIENT_ID"), redirectUri, state) w.Write([]byte(` `)) } func (a *app) callback(w http.ResponseWriter, r *http.Request) { oidcEndpoint := os.Getenv("OIDC_ENDPOINT") discovery, err := oidc.ParseDiscovery(oidcEndpoint + "/.well-known/openid-configuration") if err != nil { returnError(w, fmt.Errorf("ParseDiscovery error: %s", err)) return } if _, ok := a.states[r.URL.Query().Get("state")]; !ok { returnError(w, fmt.Errorf("state mismatch error")) return } delete(a.states, r.URL.Query().Get("state")) tokens, _, err := getTokenFromCode(discovery.TokenEndpoint, discovery.JwksURI, redirectUri, os.Getenv("CLIENT_ID"), os.Getenv("CLIENT_SECRET"), r.URL.Query().Get("code")) if err != nil { returnError(w, fmt.Errorf("getTokenFromCode error: %s", err)) return } req, err := http.NewRequest("GET", discovery.UserinfoEndpoint, nil) if err != nil { returnError(w, fmt.Errorf("newRequest error: %s", err)) return } req.Header.Add("Authorization", "Bearer "+tokens[1].Raw) client := &http.Client{} res, err := client.Do(req) if err != nil { returnError(w, fmt.Errorf("do request error: %s", err)) return } defer res.Body.Close() body, err := io.ReadAll(res.Body) if err != nil { returnError(w, fmt.Errorf("ReadAll error: %s", err)) return } fmt.Printf("IDToken: %s\n", tokens[0].Raw) w.Write([]byte(fmt.Sprintf("Token received. Userinfo: %s", body))) } func returnError(w http.ResponseWriter, err error) { w.WriteHeader(http.StatusInternalServerError) w.Write([]byte(err.Error())) fmt.Printf("Error: %s\n", err) } ================================================ FILE: oidc-demo/cmd/server/main.go ================================================ package main import ( "errors" "fmt" "io/ioutil" "log" "net/http" "os" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/server" "github.com/wardviaene/golang-for-devops-course/ssh-demo" ) const configFile = "config.yaml" func main() { var ( privateKey []byte err error ) // read config if _, err = os.Stat(configFile); errors.Is(err, os.ErrNotExist) { fmt.Printf("Error: %s doesn't exist\n", configFile) os.Exit(1) } config, err := ioutil.ReadFile(configFile) if err != nil { log.Fatalf("Failed to load %s, err: %v", configFile, err) } // read encryption key if _, err = os.Stat("enckey.pem"); errors.Is(err, os.ErrNotExist) { if privateKey, _, err = ssh.GenerateKeys(); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } if err = os.WriteFile("enckey.pem", privateKey, 0600); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } } else { privateKey, err = ioutil.ReadFile("enckey.pem") if err != nil { log.Fatalf("Failed to load authorized_keys, err: %v", err) } } fmt.Printf("Server stopped: %s", server.Start(&http.Server{Addr: ":8080"}, privateKey, server.ReadConfig(config))) } ================================================ FILE: oidc-demo/config.yaml ================================================ url: "http://localhost:8080" apps: app1: clientID: "1-2-3-4" clientSecret: "secret" issuer: "http://localhost:8080" redirectURIs: ["http://localhost:8081/callback"] ================================================ FILE: oidc-demo/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/oidc-demo go 1.25.4 require ( github.com/golang-jwt/jwt/v4 v4.5.2 github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220616215025-d61a2b0cee5f gopkg.in/yaml.v3 v3.0.1 ) require ( golang.org/x/crypto v0.45.0 // indirect golang.org/x/sys v0.38.0 // indirect golang.org/x/term v0.37.0 // indirect ) ================================================ FILE: oidc-demo/go.sum ================================================ github.com/golang-jwt/jwt/v4 v4.5.2 h1:YtQM7lnr8iZ+j5q71MGKkNw9Mn7AjHM68uc9g5fXeUI= github.com/golang-jwt/jwt/v4 v4.5.2/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0= github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220616215025-d61a2b0cee5f h1:hsbzhLUNJIwe7Kj45QVOvvVvqqMZM42NQVBtiQVWVe8= github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220616215025-d61a2b0cee5f/go.mod h1:nMRrSdJ6buN2/nVCX4zAr1VTIzeZNqK7SgTepO1zRdA= golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q= golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4= golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc= golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks= golang.org/x/term v0.37.0 h1:8EGAD0qCmHYZg6J17DvsMy9/wJ7/D/4pV/wfnld5lTU= golang.org/x/term v0.37.0/go.mod h1:5pB4lxRNYYVZuTLmy8oR2BH8dflOR+IbTYFD8fi3254= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM= gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= ================================================ FILE: oidc-demo/pkg/oidc/discovery.go ================================================ package oidc import ( "encoding/json" "io" "net/http" ) func ParseDiscovery(url string) (Discovery, error) { var discovery Discovery res, err := http.Get(url) if err != nil { return discovery, err } defer res.Body.Close() body, err := io.ReadAll(res.Body) if err = json.Unmarshal(body, &discovery); err != nil { return discovery, err } return discovery, nil } ================================================ FILE: oidc-demo/pkg/oidc/rand.go ================================================ package oidc import ( "crypto/rand" "encoding/base64" "fmt" "io" "strings" ) func GetRandomString(n int) (string, error) { buf := make([]byte, n) _, err := io.ReadFull(rand.Reader, buf) if err != nil { return "", fmt.Errorf("crypto/rand Reader error: %s", err) } randomStr := base64.URLEncoding.EncodeToString(buf) randomStr = strings.Replace(randomStr, "=", "", -1) return randomStr, nil } ================================================ FILE: oidc-demo/pkg/oidc/types.go ================================================ package oidc type Discovery struct { Issuer string `json:"issuer"` AuthorizationEndpoint string `json:"authorization_endpoint"` TokenEndpoint string `json:"token_endpoint"` UserinfoEndpoint string `json:"userinfo_endpoint"` JwksURI string `json:"jwks_uri"` ScopesSupported []string `json:"scopes_supported"` ResponseTypesSupported []string `json:"response_types_supported"` TokenEndpointAuthMethodsSupported []string `json:"token_endpoint_auth_methods_supported"` IDTokenSigningAlgValuesSupported []string `json:"id_token_signing_alg_values_supported"` ClaimsSupported []string `json:"claims_supported"` SubjectTypesSupported []string `json:"subject_types_supported"` } type Token struct { AccessToken string `json:"access_token"` TokenType string `json:"token_type"` RefreshToken string `json:"refresh_token"` ExpiresIn int `json:"expires_in"` IDToken string `json:"id_token"` } // jwks type Jwks struct { Keys []JwksKey `json:"keys"` } type JwksKey struct { N string `json:"n"` E string `json:"e"` Alg string `json:"alg"` Use string `json:"use"` Kid string `json:"kid"` Kty string `json:"kty"` } ================================================ FILE: oidc-demo/pkg/server/authorization.go ================================================ package server import ( "fmt" "net/http" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) func (s *server) authorization(w http.ResponseWriter, r *http.Request) { var ( clientID string redirectURI string scope string responseType string state string ) if clientID = r.URL.Query().Get("client_id"); clientID == "" { returnError(w, fmt.Errorf("client_id is empty")) return } if redirectURI = r.URL.Query().Get("redirect_uri"); redirectURI == "" { returnError(w, fmt.Errorf("redirectURI is empty")) return } if scope = r.URL.Query().Get("scope"); scope == "" { returnError(w, fmt.Errorf("scope is empty")) return } if responseType = r.URL.Query().Get("response_type"); responseType != "code" { returnError(w, fmt.Errorf("response_type is empty")) return } if state = r.URL.Query().Get("state"); state == "" { returnError(w, fmt.Errorf("state is empty")) return } appConfig := AppConfig{} for _, app := range s.Config.Apps { if app.ClientID == clientID { appConfig = app } } if appConfig.ClientID == "" { returnError(w, fmt.Errorf("client_id not found")) return } found := false for _, redirectURIConfig := range appConfig.RedirectURIs { if redirectURIConfig == redirectURI { found = true } } if !found { returnError(w, fmt.Errorf("redirect_uri not whitelisted")) return } sessionID, err := oidc.GetRandomString(128) if err != nil { returnError(w, fmt.Errorf("GetRandomString error: %s", err)) return } s.LoginRequest[sessionID] = LoginRequest{ ClientID: clientID, RedirectURI: redirectURI, Scope: scope, ResponseType: responseType, State: state, AppConfig: appConfig, } w.Header().Add("location", fmt.Sprintf("/login?sessionID=%s", sessionID)) w.WriteHeader(http.StatusFound) } ================================================ FILE: oidc-demo/pkg/server/authorization_test.go ================================================ package server import ( "fmt" "io" "net/http" "net/http/httptest" "testing" ) func TestAuthorization(t *testing.T) { s := newServer(privkeyPem, testConfig) // testConfig is defined in http_test.go and defines a static config endpoint := fmt.Sprintf("/authorization?client_id=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, // app1 is defined in testConfig s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } if res.StatusCode != http.StatusFound { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusFound) } fmt.Printf("Got location: %s\n", res.Header.Get("location")) } ================================================ FILE: oidc-demo/pkg/server/config.go ================================================ package server import "gopkg.in/yaml.v3" func ReadConfig(bytes []byte) Config { var config Config // config parsing err := yaml.Unmarshal(bytes, &config) if err != nil { config.LoadError = err } return config } ================================================ FILE: oidc-demo/pkg/server/discovery.go ================================================ package server import ( "encoding/json" "net/http" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) func (s *server) discovery(w http.ResponseWriter, r *http.Request) { discovery := oidc.Discovery{ Issuer: s.Config.Url, AuthorizationEndpoint: s.Config.Url + "/authorization", TokenEndpoint: s.Config.Url + "/token", UserinfoEndpoint: s.Config.Url + "/userinfo", JwksURI: s.Config.Url + "/jwks.json", ScopesSupported: []string{"openid"}, // was oidc in lecture, but should be openid ResponseTypesSupported: []string{"code"}, TokenEndpointAuthMethodsSupported: []string{"none"}, IDTokenSigningAlgValuesSupported: []string{"RS256"}, ClaimsSupported: []string{"iss", "sub", "aud", "exp", "nbf", "iat"}, SubjectTypesSupported: []string{"public"}, } out, err := json.Marshal(discovery) if err != nil { returnError(w, err) return } w.Write(out) } ================================================ FILE: oidc-demo/pkg/server/http.go ================================================ package server import ( "fmt" "net/http" ) type server struct { PrivateKey []byte Config Config LoginRequest map[string]LoginRequest Codes map[string]LoginRequest } func newServer(privateKey []byte, config Config) *server { return &server{ PrivateKey: privateKey, Config: config, LoginRequest: make(map[string]LoginRequest), Codes: make(map[string]LoginRequest), } } func Start(httpServer *http.Server, privateKey []byte, config Config) error { s := newServer(privateKey, config) http.HandleFunc("/authorization", s.authorization) http.HandleFunc("/token", s.token) http.HandleFunc("/login", s.login) http.HandleFunc("/jwks.json", s.jwks) http.HandleFunc("/.well-known/openid-configuration", s.discovery) http.HandleFunc("/userinfo", s.userinfo) return httpServer.ListenAndServe() } func returnError(w http.ResponseWriter, err error) { w.WriteHeader(http.StatusBadRequest) w.Write([]byte(err.Error())) fmt.Printf("Error: %s\n", err) } ================================================ FILE: oidc-demo/pkg/server/http_test.go ================================================ package server import ( "context" "crypto/rand" "crypto/rsa" "crypto/x509" "encoding/pem" "log" "net/http" "os" "strings" "testing" "time" ) /* Global code for all tests */ var privkeyPem []byte var testConfig Config func TestMain(m *testing.M) { err := testSetup() if err != nil { log.Fatalf("test setup failed: %s", err) } code := m.Run() os.Exit(code) } func testSetup() error { privKey, err := rsa.GenerateKey(rand.Reader, 4096) if err != nil { return err } privkeyBytes := x509.MarshalPKCS1PrivateKey(privKey) privkeyPem = pem.EncodeToMemory( &pem.Block{ Type: "RSA PRIVATE KEY", Bytes: privkeyBytes, }, ) // populate testConfig testConfig = Config{ Apps: map[string]AppConfig{ "app1": { ClientID: "1-2-3-4", ClientSecret: "secret", Issuer: "http://localhost:8080", RedirectURIs: []string{"http://localhost:8081/callback"}, }, }, } return nil } func TestStart(t *testing.T) { httpServer := &http.Server{Addr: ":8080"} go func() { err := Start(httpServer, privkeyPem, testConfig) if err != nil && err.Error() != "http: Server closed" { t.Errorf("Start error: %s\n", err) } }() time.Sleep(1 * time.Second) // give time for the http server to start endpoints := []string{"/authorization", "token", "login", "jwks.json", "/.well-known/openid-configuration", "userinfo"} for _, endpoint := range endpoints { addr := httpServer.Addr if strings.HasPrefix(addr, ":") { addr = "http://localhost" + addr } else { addr = "http://" + addr } res, err := http.Get(addr + "/" + endpoint) if err != nil { t.Fatalf("http get error: %s", err) } if res.StatusCode == 404 || res.StatusCode >= 500 { t.Errorf("Endpoint %s not available. Statuscode: %d", endpoint, res.StatusCode) } } ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) defer cancel() if err := httpServer.Shutdown(ctx); err != nil { t.Fatalf("Could not shut down http server") } } ================================================ FILE: oidc-demo/pkg/server/jwks.go ================================================ package server import ( "encoding/base64" "encoding/json" "fmt" "net/http" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) func (s *server) jwks(w http.ResponseWriter, r *http.Request) { privateKey, err := jwt.ParseRSAPrivateKeyFromPEM(s.PrivateKey) if err != nil { returnError(w, fmt.Errorf("private key parsing error: %s", err)) return } publicKey := privateKey.PublicKey jwks := oidc.Jwks{ Keys: []oidc.JwksKey{ { Kid: "0-0-0-1", Alg: "RS256", Kty: "RSA", Use: "sig", N: base64.StdEncoding.EncodeToString(publicKey.N.Bytes()), E: "AQAB", }, }, } out, err := json.Marshal(jwks) if err != nil { returnError(w, fmt.Errorf("jwks marshal error: %s", err)) return } w.Write(out) } ================================================ FILE: oidc-demo/pkg/server/login.go ================================================ package server import ( "embed" "fmt" "io" "net/http" "strings" "time" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/users" ) //go:embed templates/* var templateFs embed.FS func (s *server) login(w http.ResponseWriter, r *http.Request) { if r.Method == "POST" { err := r.ParseForm() if err != nil { returnError(w, fmt.Errorf("Parseform error: %s", err)) return } sessionID := r.PostForm.Get("sessionID") loginRequest, ok := s.LoginRequest[sessionID] if !ok { returnError(w, fmt.Errorf("Session not found")) return } auth, user, err := users.Auth(r.PostForm.Get("login"), r.PostForm.Get("password"), "") if err != nil { returnError(w, fmt.Errorf("Authentication error: %s", err)) return } if auth { code, err := oidc.GetRandomString(64) if err != nil { returnError(w, fmt.Errorf("GetRandomString error: %s", err)) return } loginRequest.CodeIssuedAt = time.Now() loginRequest.User = user s.Codes[code] = loginRequest delete(s.LoginRequest, sessionID) w.Header().Add("location", fmt.Sprintf("%s?code=%s&state=%s", loginRequest.RedirectURI, code, loginRequest.State)) w.WriteHeader(http.StatusFound) } else { w.WriteHeader(http.StatusUnauthorized) w.Write([]byte("Authentication failed")) } return } var ( sessionID string ) if sessionID = r.URL.Query().Get("sessionID"); sessionID == "" { returnError(w, fmt.Errorf("sessionID is empty")) return } templateFile, err := templateFs.Open("templates/login.html") if err != nil { returnError(w, fmt.Errorf("templateFS open error: %s", err)) return } templateFileBytes, err := io.ReadAll(templateFile) if err != nil { returnError(w, fmt.Errorf("ReadAll error: %s", err)) return } templateFileStr := strings.Replace(string(templateFileBytes), "$SESSIONID", sessionID, -1) w.Write([]byte(templateFileStr)) } ================================================ FILE: oidc-demo/pkg/server/login_test.go ================================================ package server import ( "bytes" "fmt" "io" "net/http" "net/http/httptest" "net/url" "strings" "testing" ) func TestLoginGet(t *testing.T) { s := newServer(privkeyPem, testConfig) // 1. authorization flow endpoint := fmt.Sprintf("/authorization?client_id=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } // 2. login flow req = httptest.NewRequest(http.MethodGet, res.Header.Get("location"), nil) w = httptest.NewRecorder() s.login(w, req) loginRes := w.Result() defer loginRes.Body.Close() body, err := io.ReadAll(loginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if loginRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusAccepted) } if !strings.Contains(strings.ToLower(string(body)), " Login example

Login form

Login form example from templates/login.html

================================================ FILE: oidc-demo/pkg/server/token.go ================================================ package server import ( "encoding/json" "fmt" "net/http" "time" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) func (s *server) token(w http.ResponseWriter, r *http.Request) { if r.Method != "POST" { returnError(w, fmt.Errorf("Not a POST request")) return } if err := r.ParseForm(); err != nil { returnError(w, fmt.Errorf("ParseForm error: %s", err)) return } if r.PostForm.Get("grant_type") != "authorization_code" { returnError(w, fmt.Errorf("invalid grant type: %s", r.PostForm.Get("grant_type"))) return } loginRequest, ok := s.Codes[r.PostForm.Get("code")] if !ok { returnError(w, fmt.Errorf("invalid code")) return } if time.Now().After(loginRequest.CodeIssuedAt.Add(10 * time.Minute)) { returnError(w, fmt.Errorf("code expired")) return } if loginRequest.ClientID != r.PostForm.Get("client_id") { returnError(w, fmt.Errorf("client_id mismatch")) return } if loginRequest.AppConfig.ClientSecret != r.PostForm.Get("client_secret") { returnError(w, fmt.Errorf("invalid client_secret")) return } if loginRequest.RedirectURI != r.PostForm.Get("redirect_uri") { returnError(w, fmt.Errorf("invalid redirect_uri")) return } privateKey, err := jwt.ParseRSAPrivateKeyFromPEM(s.PrivateKey) if err != nil { returnError(w, fmt.Errorf("private key parsing error: %s", err)) return } claims := jwt.MapClaims{ "iss": s.Config.Url, "sub": loginRequest.User.Sub, "aud": loginRequest.ClientID, "exp": time.Now().Add(1 * time.Hour).Unix(), "nbf": time.Now().Unix(), "iat": time.Now().Unix(), } token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims) token.Header["kid"] = "0-0-0-1" signedIDToken, err := token.SignedString(privateKey) if err != nil { returnError(w, fmt.Errorf("signedString error: %s", err)) return } // access token claims = jwt.MapClaims{ "iss": s.Config.Url, "sub": loginRequest.User.Sub, "aud": []string{ s.Config.Url + "/userinfo", }, "exp": time.Now().Add(1 * time.Hour).Unix(), "nbf": time.Now().Unix(), "iat": time.Now().Unix(), } token = jwt.NewWithClaims(jwt.SigningMethodRS256, claims) token.Header["kid"] = "0-0-0-1" signedAccessToken, err := token.SignedString(privateKey) if err != nil { returnError(w, fmt.Errorf("signedString error: %s", err)) return } tokenOutput := oidc.Token{ AccessToken: signedAccessToken, IDToken: signedIDToken, TokenType: "bearer", ExpiresIn: 60, } delete(s.Codes, r.PostForm.Get("code")) out, err := json.Marshal(tokenOutput) if err != nil { returnError(w, fmt.Errorf("token marshal error: %s", err)) return } w.Write(out) } ================================================ FILE: oidc-demo/pkg/server/token_test.go ================================================ package server import ( "bytes" "encoding/json" "fmt" "io" "net/http" "net/http/httptest" "net/url" "testing" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) func TestToken(t *testing.T) { loginField := "login" passwordField := "password" loginValue := "edward" passwordValue := "password" s := newServer(privkeyPem, testConfig) // 1. authorization flow endpoint := fmt.Sprintf("/authorization?client_id=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } // 2. login get flow req = httptest.NewRequest(http.MethodGet, res.Header.Get("location"), nil) w = httptest.NewRecorder() s.login(w, req) loginRes := w.Result() defer loginRes.Body.Close() _, err = io.ReadAll(loginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if loginRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusOK) } // 3. Login post flow (we're also adding any values that were passed to the login page - in case a sessionID or state was added) loginUrl, err := url.Parse(res.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } form := url.Values{} form.Add(loginField, loginValue) form.Add(passwordField, passwordValue) for key, values := range loginUrl.Query() { for _, value := range values { form.Add(key, value) } } req = httptest.NewRequest(http.MethodPost, "/login", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.login(w, req) postLoginRes := w.Result() defer postLoginRes.Body.Close() _, err = io.ReadAll(postLoginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if postLoginRes.StatusCode != http.StatusFound { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusFound) } if postLoginRes.Header.Get("location") == "" { t.Fatalf("Location header not set") } postLoginUrl, err := url.Parse(postLoginRes.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } if postLoginUrl.Query().Get("code") == "" { t.Fatalf("No code received in login redirect") } // 4. exchange code into token form = url.Values{} form.Add("grant_type", "authorization_code") form.Add("client_id", s.Config.Apps["app1"].ClientID) form.Add("client_secret", s.Config.Apps["app1"].ClientSecret) form.Add("redirect_uri", s.Config.Apps["app1"].RedirectURIs[0]) form.Add("code", postLoginUrl.Query().Get("code")) req = httptest.NewRequest(http.MethodPost, "/token", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.token(w, req) tokenRes := w.Result() defer tokenRes.Body.Close() body, err := io.ReadAll(tokenRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if tokenRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d). Body: %s", tokenRes.StatusCode, http.StatusOK, body) } var tokenResponse oidc.Token err = json.Unmarshal(body, &tokenResponse) if err != nil { t.Errorf("Token Unmarshal error: %s", err) } if tokenResponse.IDToken == "" { fmt.Printf("IDToken is empty") } claims := jwt.StandardClaims{} _, err = jwt.ParseWithClaims(tokenResponse.IDToken, &claims, func(token *jwt.Token) (interface{}, error) { privateKeyParsed, err := jwt.ParseRSAPrivateKeyFromPEM(s.PrivateKey) if err != nil { return nil, err } return &privateKeyParsed.PublicKey, nil }) if err != nil { t.Fatalf("invalid token error: %s", err) } fmt.Printf("Got valid token from token endpoint\n") } ================================================ FILE: oidc-demo/pkg/server/types.go ================================================ package server import ( "time" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/users" ) type Config struct { Apps map[string]AppConfig `yaml:"apps"` Url string `yaml:"url"` LoadError error } type AppConfig struct { ClientID string `yaml:"clientID"` ClientSecret string `yaml:"clientSecret"` Issuer string `yaml:"issuer"` RedirectURIs []string `yaml:"redirectURIs"` } type LoginRequest struct { ClientID string RedirectURI string Scope string ResponseType string State string CodeIssuedAt time.Time User users.User AppConfig AppConfig } ================================================ FILE: oidc-demo/pkg/server/userinfo.go ================================================ package server import ( "encoding/json" "fmt" "net/http" "strings" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/users" ) func (s *server) userinfo(w http.ResponseWriter, r *http.Request) { authorizationHeader := r.Header.Get("Authorization") if authorizationHeader == "" { returnError(w, fmt.Errorf("Authorization header empty")) return } authorizationHeader = strings.Replace(authorizationHeader, "Bearer ", "", -1) claims := &jwt.RegisteredClaims{} _, err := jwt.ParseWithClaims(authorizationHeader, claims, func(token *jwt.Token) (interface{}, error) { privateKey, err := jwt.ParseRSAPrivateKeyFromPEM(s.PrivateKey) if err != nil { return nil, fmt.Errorf("Parse private key error: %s", err) } return &privateKey.PublicKey, nil }) if err != nil { returnError(w, fmt.Errorf("parse token error: %s", err)) return } found := false for _, aud := range claims.Audience { if aud == s.Config.Url+"/userinfo" { found = true } } if !found { returnError(w, fmt.Errorf("token has incorrect audience: %s", strings.Join(claims.Audience, ", "))) return } if claims.Subject == "" { returnError(w, fmt.Errorf("subject is empty")) return } for _, user := range users.GetAllUsers() { if user.Sub == claims.Subject { out, err := json.Marshal(user) if err != nil { returnError(w, fmt.Errorf("json marshal error: %s", err)) return } w.Write(out) return } } returnError(w, fmt.Errorf("user not found")) return } ================================================ FILE: oidc-demo/pkg/server/userinfo_test.go ================================================ package server import ( "bytes" "encoding/json" "fmt" "io" "net/http" "net/http/httptest" "net/url" "testing" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-demo/pkg/oidc" ) func TestUserInfo(t *testing.T) { loginField := "login" passwordField := "password" loginValue := "edward" passwordValue := "password" s := newServer(privkeyPem, testConfig) // 1. authorization flow endpoint := fmt.Sprintf("/authorization?client_id=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } // 2. login get flow req = httptest.NewRequest(http.MethodGet, res.Header.Get("location"), nil) w = httptest.NewRecorder() s.login(w, req) loginRes := w.Result() defer loginRes.Body.Close() _, err = io.ReadAll(loginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if loginRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusOK) } // 3. Login post flow (we're also adding any values that were passed to the login page - in case a sessionID or state was added) loginUrl, err := url.Parse(res.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } form := url.Values{} form.Add(loginField, loginValue) form.Add(passwordField, passwordValue) for key, values := range loginUrl.Query() { for _, value := range values { form.Add(key, value) } } req = httptest.NewRequest(http.MethodPost, "/login", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.login(w, req) postLoginRes := w.Result() defer postLoginRes.Body.Close() _, err = io.ReadAll(postLoginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if postLoginRes.StatusCode != http.StatusFound { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusFound) } if postLoginRes.Header.Get("location") == "" { t.Fatalf("Location header not set") } postLoginUrl, err := url.Parse(postLoginRes.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } if postLoginUrl.Query().Get("code") == "" { t.Fatalf("No code received in login redirect") } // 4. exchange code into token form = url.Values{} form.Add("grant_type", "authorization_code") form.Add("client_id", s.Config.Apps["app1"].ClientID) form.Add("client_secret", s.Config.Apps["app1"].ClientSecret) form.Add("redirect_uri", s.Config.Apps["app1"].RedirectURIs[0]) form.Add("code", postLoginUrl.Query().Get("code")) req = httptest.NewRequest(http.MethodPost, "/token", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.token(w, req) tokenRes := w.Result() defer tokenRes.Body.Close() body, err := io.ReadAll(tokenRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if tokenRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d). Body: %s", tokenRes.StatusCode, http.StatusOK, body) } var tokenResponse oidc.Token err = json.Unmarshal(body, &tokenResponse) if err != nil { t.Errorf("Token Unmarshal error: %s", err) } if tokenResponse.IDToken == "" { fmt.Printf("IDToken is empty") } claims := jwt.RegisteredClaims{} _, err = jwt.ParseWithClaims(tokenResponse.AccessToken, &claims, func(token *jwt.Token) (interface{}, error) { privateKeyParsed, err := jwt.ParseRSAPrivateKeyFromPEM(s.PrivateKey) if err != nil { return nil, err } return &privateKeyParsed.PublicKey, nil }) if err != nil { t.Fatalf("invalid token error: %s", err) } // 5. Use token for userinfo endpoint req = httptest.NewRequest(http.MethodPost, "/userinfo", bytes.NewBufferString(form.Encode())) req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", tokenResponse.AccessToken)) w = httptest.NewRecorder() s.userinfo(w, req) userinfoRes := w.Result() defer userinfoRes.Body.Close() body, err = io.ReadAll(userinfoRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if userinfoRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d). Body: %s", userinfoRes.StatusCode, http.StatusOK, body) } fmt.Printf("Got userinfo JSON: %s\n", body) } ================================================ FILE: oidc-demo/pkg/users/auth.go ================================================ package users import "fmt" type User struct { Sub string `json:"sub"` Name string `json:"name"` GivenName string `json:"given_name"` FamilyName string `json:"family_name"` PreferredUsername string `json:"preferred_username"` Email string `json:"email"` Picture string `json:"picture"` } func Auth(login, password, mfa string) (bool, User, error) { if login == "edward" && password == "password" { return true, GetAllUsers()[0], nil } return false, User{}, fmt.Errorf("Invalid login or password") } func GetAllUsers() []User { return []User{ { Sub: "9-9-9-9", Name: "Edward Viaene", GivenName: "Edward", FamilyName: "Viaene", PreferredUsername: "edward", Email: "edward@domain.inv", }, } } ================================================ FILE: oidc-start/.gitignore ================================================ *.pem ================================================ FILE: oidc-start/cmd/appserver/jwt.go ================================================ package main import "github.com/golang-jwt/jwt/v4" // gets token from tokenUrl validating token with jwksUrl and returning token & claims func getTokenFromCode(tokenUrl, jwksUrl, redirectUri, clientID, clientSecret, code string) (*jwt.Token, *jwt.StandardClaims, error) { return nil, nil, nil } ================================================ FILE: oidc-start/cmd/appserver/jwt_test.go ================================================ package main import ( "crypto/rand" "crypto/rsa" "encoding/base64" "encoding/json" "fmt" "net/http" "net/http/httptest" "testing" "time" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-start/pkg/oidc" ) func TestGetTokenFromCode(t *testing.T) { // generate private key privateKey, err := rsa.GenerateKey(rand.Reader, 4096) if err != nil { t.Fatalf("Couldn't generate rsa key") } ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { // generate jwt and return if r.URL.Path == "/token" { claims := jwt.MapClaims{ "iss": "http://example.com", "sub": "1-2-3-5", "aud": "1-2-3-4", "exp": time.Now().Add(1 * time.Hour).Unix(), "iat": time.Now().Unix(), } token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims) token.Header["kid"] = "0-0-0-1" idTokenString, err := token.SignedString(privateKey) if err != nil { t.Fatalf("SignedString: %s", err) } // generate Access Token claims = jwt.MapClaims{ "iss": "http://example.com", "sub": "1-2-3-4", "aud": []string{ "http://example.com/userinfo", }, "exp": time.Now().Add(1 * time.Hour).Unix(), "iat": time.Now().Unix(), } token = jwt.NewWithClaims(jwt.SigningMethodRS256, claims) token.Header["kid"] = "0-0-0-1" accessTokenString, err := token.SignedString(privateKey) if err != nil { t.Fatalf("SignedString: %s", err) } refreshToken, err := oidc.GetRandomString(64) if err != nil { t.Fatalf("random string error: %s", err) } responseToken := oidc.Token{ IDToken: idTokenString, AccessToken: accessTokenString, ExpiresIn: 60, TokenType: "bearer", RefreshToken: refreshToken, } out, err := json.Marshal(responseToken) if err != nil { t.Fatalf("json marshal error: %s", err) return } w.Write(out) } else if r.URL.Path == "/jwks.json" { jwks := oidc.Jwks{ Keys: []oidc.JwksKey{ { N: base64.StdEncoding.EncodeToString(privateKey.PublicKey.N.Bytes()), E: "AQAB", Alg: "RS256", Use: "sig", Kid: "0-0-0-1", Kty: "RSA", }, }, } out, err := json.Marshal(jwks) if err != nil { t.Fatalf("jwks marshall error: %s", err) return } w.Write(out) } })) defer ts.Close() _, claims, err := getTokenFromCode(ts.URL+"/token", ts.URL+"/jwks.json", "http://localhost:8081", "1-2-3-4", "secret", "mycode") if err != nil { t.Fatalf("getTokenFromCode error: %s", err) } if claims == nil { t.Fatalf("claims is nil") } fmt.Printf("Exchanged code into token. Subject: %s\n", claims.Subject) } ================================================ FILE: oidc-start/cmd/appserver/main.go ================================================ package main import ( "fmt" "net/http" ) const redirectUri = "http://localhost:8081/callback" type app struct { } func main() { a := app{} http.HandleFunc("/", a.index) http.HandleFunc("/callback", a.callback) err := http.ListenAndServe(":8081", nil) if err != nil { fmt.Printf("ListenAndServe error: %s\n", err) } } func (a *app) index(w http.ResponseWriter, r *http.Request) { } func (a *app) callback(w http.ResponseWriter, r *http.Request) { } ================================================ FILE: oidc-start/cmd/server/main.go ================================================ package main import ( "errors" "fmt" "io/ioutil" "log" "net/http" "os" "github.com/wardviaene/golang-for-devops-course/oidc-start/pkg/server" "github.com/wardviaene/golang-for-devops-course/ssh-demo" ) const configFile = "" func main() { var ( privateKey []byte err error ) // read config if _, err = os.Stat(configFile); errors.Is(err, os.ErrNotExist) { fmt.Printf("Error: %s doesn't exist\n", configFile) os.Exit(1) } config, err := ioutil.ReadFile(configFile) if err != nil { log.Fatalf("Failed to load %s, err: %v", configFile, err) } // read encryption key if _, err = os.Stat("enckey.pem"); errors.Is(err, os.ErrNotExist) { if privateKey, _, err = ssh.GenerateKeys(); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } if err = os.WriteFile("enckey.pem", privateKey, 0600); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } } else { privateKey, err = ioutil.ReadFile("enckey.pem") if err != nil { log.Fatalf("Failed to load authorized_keys, err: %v", err) } } fmt.Printf("Server stopped: %s", server.Start(&http.Server{Addr: ":8080"}, privateKey, server.ReadConfig(config))) } ================================================ FILE: oidc-start/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/oidc-start go 1.25.4 require ( github.com/golang-jwt/jwt/v4 v4.5.2 github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220616215025-d61a2b0cee5f ) require ( golang.org/x/crypto v0.45.0 // indirect golang.org/x/sys v0.38.0 // indirect golang.org/x/term v0.37.0 // indirect ) ================================================ FILE: oidc-start/go.sum ================================================ github.com/golang-jwt/jwt/v4 v4.5.2 h1:YtQM7lnr8iZ+j5q71MGKkNw9Mn7AjHM68uc9g5fXeUI= github.com/golang-jwt/jwt/v4 v4.5.2/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0= github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220616215025-d61a2b0cee5f h1:hsbzhLUNJIwe7Kj45QVOvvVvqqMZM42NQVBtiQVWVe8= github.com/wardviaene/golang-for-devops-course/ssh-demo v0.0.0-20220616215025-d61a2b0cee5f/go.mod h1:nMRrSdJ6buN2/nVCX4zAr1VTIzeZNqK7SgTepO1zRdA= golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q= golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4= golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc= golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks= golang.org/x/term v0.37.0 h1:8EGAD0qCmHYZg6J17DvsMy9/wJ7/D/4pV/wfnld5lTU= golang.org/x/term v0.37.0/go.mod h1:5pB4lxRNYYVZuTLmy8oR2BH8dflOR+IbTYFD8fi3254= ================================================ FILE: oidc-start/pkg/oidc/discovery.go ================================================ package oidc import ( "encoding/json" "io" "net/http" ) func ParseDiscovery(url string) (Discovery, error) { var discovery Discovery res, err := http.Get(url) if err != nil { return discovery, err } defer res.Body.Close() body, err := io.ReadAll(res.Body) if err = json.Unmarshal(body, &discovery); err != nil { return discovery, err } return discovery, nil } ================================================ FILE: oidc-start/pkg/oidc/rand.go ================================================ package oidc import ( "crypto/rand" "encoding/base64" "fmt" "io" "strings" ) func GetRandomString(n int) (string, error) { buf := make([]byte, n) _, err := io.ReadFull(rand.Reader, buf) if err != nil { return "", fmt.Errorf("crypto/rand is unavailable: Read() failed with %#v", err) } randomStr := base64.URLEncoding.EncodeToString(buf) randomStr = strings.Replace(randomStr, "=", "", -1) return randomStr, nil } ================================================ FILE: oidc-start/pkg/oidc/types.go ================================================ package oidc // discovery type Discovery struct { Issuer string `json:"issuer"` AuthorizationEndpoint string `json:"authorization_endpoint"` TokenEndpoint string `json:"token_endpoint"` UserinfoEndpoint string `json:"userinfo_endpoint"` JwksURI string `json:"jwks_uri"` ScopesSupported []string `json:"scopes_supported"` ResponseTypesSupported []string `json:"response_types_supported"` TokenEndpointAuthMethodsSupported []string `json:"token_endpoint_auth_methods_supported"` } // token type Token struct { AccessToken string `json:"access_token"` TokenType string `json:"token_type"` RefreshToken string `json:"refresh_token"` ExpiresIn int `json:"expires_in"` IDToken string `json:"id_token"` } // jwks type Jwks struct { Keys []JwksKey `json:"keys"` } type JwksKey struct { N string `json:"n"` E string `json:"e"` Alg string `json:"alg"` Use string `json:"use"` Kid string `json:"kid"` Kty string `json:"kty"` } ================================================ FILE: oidc-start/pkg/server/authorization.go ================================================ package server import ( "net/http" ) func (s *server) authorization(w http.ResponseWriter, r *http.Request) { } ================================================ FILE: oidc-start/pkg/server/authorization_test.go ================================================ package server import ( "fmt" "io" "net/http" "net/http/httptest" "testing" ) func TestAuthorization(t *testing.T) { s := newServer(privkeyPem, testConfig) endpoint := fmt.Sprintf("/authorization?client_id=%s&client_secret=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, s.Config.Apps["app1"].ClientSecret, s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } if res.StatusCode != http.StatusFound { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusAccepted) } fmt.Printf("Got location: %s\n", res.Header.Get("location")) } ================================================ FILE: oidc-start/pkg/server/config.go ================================================ package server func ReadConfig(bytes []byte) Config { var config Config // config parsing return config } ================================================ FILE: oidc-start/pkg/server/config_test.go ================================================ package server ================================================ FILE: oidc-start/pkg/server/discovery.go ================================================ package server import ( "net/http" ) func (s *server) discovery(w http.ResponseWriter, r *http.Request) { } ================================================ FILE: oidc-start/pkg/server/http.go ================================================ package server import ( "net/http" ) type server struct { PrivateKey []byte Config Config } func newServer(privateKey []byte, config Config) *server { return &server{ PrivateKey: privateKey, Config: config, } } func Start(httpServer *http.Server, privateKey []byte, config Config) error { s := newServer(privateKey, config) http.HandleFunc("/authorization", s.authorization) http.HandleFunc("/token", s.token) http.HandleFunc("/login", s.login) http.HandleFunc("/jwks.json", s.jwks) http.HandleFunc("/.well-known/openid-configuration", s.discovery) http.HandleFunc("/userinfo", s.userinfo) return httpServer.ListenAndServe() } ================================================ FILE: oidc-start/pkg/server/http_test.go ================================================ package server import ( "context" "crypto/rand" "crypto/rsa" "crypto/x509" "encoding/pem" "log" "net/http" "os" "strings" "testing" "time" ) /* Global code for all tests */ var privkeyPem []byte var testConfig Config func TestMain(m *testing.M) { err := testSetup() if err != nil { log.Fatalf("test setup failed: %s", err) } code := m.Run() os.Exit(code) } func testSetup() error { privKey, err := rsa.GenerateKey(rand.Reader, 4096) if err != nil { return err } privkeyBytes := x509.MarshalPKCS1PrivateKey(privKey) privkeyPem = pem.EncodeToMemory( &pem.Block{ Type: "RSA PRIVATE KEY", Bytes: privkeyBytes, }, ) // populate testConfig testConfig = Config{ Apps: map[string]AppConfig{ "app1": { ClientID: "1-2-3-4", ClientSecret: "secret", Issuer: "http://localhost:8080", RedirectURIs: []string{"http://localhost:8082/callback"}, }, }, } return nil } func TestStart(t *testing.T) { httpServer := &http.Server{Addr: ":8080"} go func() { err := Start(httpServer, privkeyPem, testConfig) if err != nil && err.Error() != "http: Server closed" { t.Errorf("Start error: %s\n", err) } }() time.Sleep(1 * time.Second) // give time for the http server to start endpoints := []string{"/authorization", "token", "login", "jwks.json", "/.well-known/openid-configuration", "userinfo"} for _, endpoint := range endpoints { addr := httpServer.Addr if strings.HasPrefix(addr, ":") { addr = "http://localhost" + addr } else { addr = "http://" + addr } res, err := http.Get(addr + "/" + endpoint) if err != nil { t.Fatalf("http get error: %s", err) } if res.StatusCode == 404 || res.StatusCode >= 500 { t.Errorf("Endpoint %s not available. Statuscode: %d", endpoint, res.StatusCode) } } ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) defer cancel() if err := httpServer.Shutdown(ctx); err != nil { t.Fatalf("Could not shut down http server") } } ================================================ FILE: oidc-start/pkg/server/jwks.go ================================================ package server import ( "net/http" ) func (s *server) jwks(w http.ResponseWriter, r *http.Request) { } ================================================ FILE: oidc-start/pkg/server/login.go ================================================ package server import ( "embed" "net/http" ) //go:embed templates/* var templateFs embed.FS func (s *server) login(w http.ResponseWriter, r *http.Request) { // to access the login template: // templateFile, err := templateFs.Open("templates/login.html") } ================================================ FILE: oidc-start/pkg/server/login_test.go ================================================ package server import ( "bytes" "fmt" "io" "net/http" "net/http/httptest" "net/url" "strings" "testing" ) func TestLoginGet(t *testing.T) { s := newServer(privkeyPem, testConfig) // 1. authorization flow endpoint := fmt.Sprintf("/authorization?client_id=%s&client_secret=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, s.Config.Apps["app1"].ClientSecret, s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } // 2. login flow req = httptest.NewRequest(http.MethodGet, res.Header.Get("location"), nil) w = httptest.NewRecorder() s.login(w, req) loginRes := w.Result() defer loginRes.Body.Close() body, err := io.ReadAll(loginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if loginRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusAccepted) } if !strings.Contains(strings.ToLower(string(body)), " Login example

Login form

Login form example from templates/login.html

================================================ FILE: oidc-start/pkg/server/token.go ================================================ package server import ( "net/http" ) func (s *server) token(w http.ResponseWriter, r *http.Request) { } ================================================ FILE: oidc-start/pkg/server/token_test.go ================================================ package server import ( "bytes" "encoding/json" "fmt" "io" "net/http" "net/http/httptest" "net/url" "testing" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-start/pkg/oidc" ) func TestToken(t *testing.T) { loginField := "login" passwordField := "password" loginValue := "edward" passwordValue := "password" s := newServer(privkeyPem, testConfig) // 1. authorization flow endpoint := fmt.Sprintf("/authorization?client_id=%s&client_secret=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, s.Config.Apps["app1"].ClientSecret, s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } // 2. login get flow req = httptest.NewRequest(http.MethodGet, res.Header.Get("location"), nil) w = httptest.NewRecorder() s.login(w, req) loginRes := w.Result() defer loginRes.Body.Close() _, err = io.ReadAll(loginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if loginRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusOK) } // 3. Login post flow (we're also adding any values that were passed to the login page - in case a sessionID or state was added) loginUrl, err := url.Parse(res.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } form := url.Values{} form.Add(loginField, loginValue) form.Add(passwordField, passwordValue) for key, values := range loginUrl.Query() { for _, value := range values { form.Add(key, value) } } req = httptest.NewRequest(http.MethodPost, "/login", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.login(w, req) postLoginRes := w.Result() defer postLoginRes.Body.Close() _, err = io.ReadAll(postLoginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if postLoginRes.StatusCode != http.StatusFound { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusFound) } if postLoginRes.Header.Get("location") == "" { t.Fatalf("Location header not set") } postLoginUrl, err := url.Parse(postLoginRes.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } if postLoginUrl.Query().Get("code") == "" { t.Fatalf("No code received in login redirect") } // 4. exchange code into token form = url.Values{} form.Add("grant_type", "authorization_code") form.Add("client_id", s.Config.Apps["app1"].ClientID) form.Add("client_secret", s.Config.Apps["app1"].ClientSecret) form.Add("redirect_uri", s.Config.Apps["app1"].RedirectURIs[0]) form.Add("code", postLoginUrl.Query().Get("code")) req = httptest.NewRequest(http.MethodPost, "/token", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.token(w, req) tokenRes := w.Result() defer tokenRes.Body.Close() body, err := io.ReadAll(tokenRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if tokenRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d). Body: %s", tokenRes.StatusCode, http.StatusOK, body) } var tokenResponse oidc.Token err = json.Unmarshal(body, &tokenResponse) if err != nil { t.Errorf("Token Unmarshal error: %s", err) } if tokenResponse.IDToken == "" { fmt.Printf("IDToken is empty") } claims := jwt.StandardClaims{} _, err = jwt.ParseWithClaims(tokenResponse.IDToken, &claims, func(token *jwt.Token) (interface{}, error) { privateKeyParsed, err := jwt.ParseRSAPrivateKeyFromPEM(s.PrivateKey) if err != nil { return nil, err } return &privateKeyParsed.PublicKey, nil }) if err != nil { t.Fatalf("invalid token error: %s", err) } fmt.Printf("Got valid token from token endpoint\n") } ================================================ FILE: oidc-start/pkg/server/types.go ================================================ package server type Config struct { Apps map[string]AppConfig Url string LoadError error } type AppConfig struct { ClientID string ClientSecret string Issuer string RedirectURIs []string } ================================================ FILE: oidc-start/pkg/server/userinfo.go ================================================ package server import ( "net/http" ) func (s *server) userinfo(w http.ResponseWriter, r *http.Request) { } ================================================ FILE: oidc-start/pkg/server/userinfo_test.go ================================================ package server import ( "bytes" "encoding/json" "fmt" "io" "net/http" "net/http/httptest" "net/url" "testing" "github.com/golang-jwt/jwt/v4" "github.com/wardviaene/golang-for-devops-course/oidc-start/pkg/oidc" ) func TestUserInfo(t *testing.T) { loginField := "login" passwordField := "password" loginValue := "edward" passwordValue := "password" s := newServer(privkeyPem, testConfig) // 1. authorization flow endpoint := fmt.Sprintf("/authorization?client_id=%s&client_secret=%s&redirect_uri=%s&scope=openid&response_type=code&state=randomstring", s.Config.Apps["app1"].ClientID, s.Config.Apps["app1"].ClientSecret, s.Config.Apps["app1"].RedirectURIs[0], ) req := httptest.NewRequest(http.MethodGet, endpoint, nil) w := httptest.NewRecorder() s.authorization(w, req) res := w.Result() defer res.Body.Close() _, err := io.ReadAll(res.Body) if err != nil { t.Errorf("Readall error: %s", err) } if res.Header.Get("location") == "" { t.Fatalf("Location header not set") } // 2. login get flow req = httptest.NewRequest(http.MethodGet, res.Header.Get("location"), nil) w = httptest.NewRecorder() s.login(w, req) loginRes := w.Result() defer loginRes.Body.Close() _, err = io.ReadAll(loginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if loginRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusOK) } // 3. Login post flow (we're also adding any values that were passed to the login page - in case a sessionID or state was added) loginUrl, err := url.Parse(res.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } form := url.Values{} form.Add(loginField, loginValue) form.Add(passwordField, passwordValue) for key, values := range loginUrl.Query() { for _, value := range values { form.Add(key, value) } } req = httptest.NewRequest(http.MethodPost, "/login", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.login(w, req) postLoginRes := w.Result() defer postLoginRes.Body.Close() _, err = io.ReadAll(postLoginRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if postLoginRes.StatusCode != http.StatusFound { t.Fatalf("HTTP StatusCode: %d (expected %d)", res.StatusCode, http.StatusFound) } if postLoginRes.Header.Get("location") == "" { t.Fatalf("Location header not set") } postLoginUrl, err := url.Parse(postLoginRes.Header.Get("location")) if err != nil { t.Fatalf("Couldn't parse loginUrl: %s", err) } if postLoginUrl.Query().Get("code") == "" { t.Fatalf("No code received in login redirect") } // 4. exchange code into token form = url.Values{} form.Add("grant_type", "authorization_code") form.Add("client_id", s.Config.Apps["app1"].ClientID) form.Add("client_secret", s.Config.Apps["app1"].ClientSecret) form.Add("redirect_uri", s.Config.Apps["app1"].RedirectURIs[0]) form.Add("code", postLoginUrl.Query().Get("code")) req = httptest.NewRequest(http.MethodPost, "/token", bytes.NewBufferString(form.Encode())) req.Header.Add("Content-Type", "application/x-www-form-urlencoded") w = httptest.NewRecorder() s.token(w, req) tokenRes := w.Result() defer tokenRes.Body.Close() body, err := io.ReadAll(tokenRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if tokenRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d). Body: %s", tokenRes.StatusCode, http.StatusOK, body) } var tokenResponse oidc.Token err = json.Unmarshal(body, &tokenResponse) if err != nil { t.Errorf("Token Unmarshal error: %s", err) } if tokenResponse.IDToken == "" { fmt.Printf("IDToken is empty") } claims := jwt.StandardClaims{} _, err = jwt.ParseWithClaims(tokenResponse.IDToken, &claims, func(token *jwt.Token) (interface{}, error) { privateKeyParsed, err := jwt.ParseRSAPrivateKeyFromPEM(s.PrivateKey) if err != nil { return nil, err } return &privateKeyParsed.PublicKey, nil }) if err != nil { t.Fatalf("invalid token error: %s", err) } // 5. Use token for userinfo endpoint req = httptest.NewRequest(http.MethodPost, "/userinfo", bytes.NewBufferString(form.Encode())) req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", tokenResponse.AccessToken)) w = httptest.NewRecorder() s.userinfo(w, req) userinfoRes := w.Result() defer userinfoRes.Body.Close() body, err = io.ReadAll(userinfoRes.Body) if err != nil { t.Errorf("Readall error: %s", err) } if userinfoRes.StatusCode != http.StatusOK { t.Fatalf("HTTP StatusCode: %d (expected %d). Body: %s", userinfoRes.StatusCode, http.StatusOK, body) } fmt.Printf("Got userinfo JSON: %s\n", body) } ================================================ FILE: oidc-start/pkg/users/auth.go ================================================ package users import "fmt" type User struct { Sub string `json:"sub"` Name string `json:"name"` GivenName string `json:"given_name"` FamilyName string `json:"family_name"` PreferredUsername string `json:"preferred_username"` Email string `json:"email"` Picture string `json:"picture"` } func Auth(login, password, mfa string) (bool, User, error) { if login == "edward" && password == "password" { return true, GetAllUsers()[0], nil } return false, User{}, fmt.Errorf("Invalid login or password") } func GetAllUsers() []User { return []User{ { Sub: "9-9-9-9", Name: "edward", GivenName: "Edward", FamilyName: "Viaene", PreferredUsername: "edward", Email: "edward@domain.inv", }, } } ================================================ FILE: reader-example/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/reader-example go 1.25.4 ================================================ FILE: reader-example/main.go ================================================ package main import ( "fmt" "io" "log" ) type MySlowReader struct { contents string pos int } func (m *MySlowReader) Read(p []byte) (int, error) { if m.pos+1 <= len(m.contents) { n := copy(p, m.contents[m.pos:m.pos+1]) m.pos++ return n, nil } return 0, io.EOF } func main() { myReaderInstance := &MySlowReader{ contents: "a", } out, err := io.ReadAll(myReaderInstance) if err != nil { log.Fatal(err) } fmt.Printf("output: %s", out) } ================================================ FILE: slices-demo/cmd/array-and-slice/main.go ================================================ package main import "fmt" func main() { var arr1 [7]int = [7]int{7, 3, 6, 0, 4, 9, 10} fmt.Println(arr1) fmt.Printf("%d %d\n", len(arr1), cap(arr1)) var arr2 []int = arr1[1:3] fmt.Println(arr2) fmt.Printf("%d %d\n", len(arr2), cap(arr2)) arr2 = arr2[0 : len(arr2)+2] fmt.Println(arr2) fmt.Printf("%d %d\n", len(arr2), cap(arr2)) for k := range arr2 { arr2[k] += 1 } fmt.Println(arr2) fmt.Printf("%d %d\n", len(arr2), cap(arr2)) fmt.Println(arr1) var arr3 []int = []int{1, 2, 3} fmt.Println(arr3) fmt.Printf("%d %d\n", len(arr3), cap(arr3)) arr3 = append(arr3, 4) fmt.Println(arr3) fmt.Printf("%d %d\n", len(arr3), cap(arr3)) arr3 = append(arr3, 5) fmt.Println(arr3) fmt.Printf("%d %d\n", len(arr3), cap(arr3)) arr4 := make([]int, 3, 9) fmt.Println(arr4) fmt.Printf("%d %d\n", len(arr4), cap(arr4)) } ================================================ FILE: slices-demo/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/slices-demo go 1.19 ================================================ FILE: ssh-demo/.gitignore ================================================ *.pem *.pub ================================================ FILE: ssh-demo/cmd/client/main.go ================================================ package main import ( "fmt" "io/ioutil" "log" "golang.org/x/crypto/ssh" ) func main() { var ( err error ) privateKey, err := ioutil.ReadFile("mykey.pem") if err != nil { log.Fatalf("Failed to load mykey.pem, err: %v", err) } publicKey, err := ioutil.ReadFile("server.pub") if err != nil { log.Fatalf("Failed to load server.pub, err: %v", err) } privateKeyParsed, err := ssh.ParsePrivateKey(privateKey) if err != nil { log.Fatalf("Failed to parse mykey.pem, err: %v", err) } publicKeyParsed, _, _, _, err := ssh.ParseAuthorizedKey(publicKey) if err != nil { log.Fatalf("Failed to parse server.pub, err: %v", err) } config := &ssh.ClientConfig{ User: "username", Auth: []ssh.AuthMethod{ ssh.PublicKeys(privateKeyParsed), }, HostKeyCallback: ssh.FixedHostKey(publicKeyParsed), } client, err := ssh.Dial("tcp", "localhost:2022", config) if err != nil { log.Fatal("Failed to dial: ", err) } defer client.Close() session, err := client.NewSession() if err != nil { log.Fatal("NewSession error: ", err) } defer session.Close() out, err := session.Output("whoami") if err != nil { log.Fatal("Session output error: ", err) } fmt.Printf("Output is: %s\n", out) } ================================================ FILE: ssh-demo/cmd/keygen/main.go ================================================ package main import ( "fmt" "os" "github.com/wardviaene/golang-for-devops-course/ssh-demo" ) func main() { var ( privateKey []byte publicKey []byte err error ) if privateKey, publicKey, err = ssh.GenerateKeys(); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } if err = os.WriteFile("mykey.pem", privateKey, 0600); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } if err = os.WriteFile("mykey.pub", publicKey, 0644); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } } ================================================ FILE: ssh-demo/cmd/server/main.go ================================================ package main import ( "fmt" "io/ioutil" "log" "os" "github.com/wardviaene/golang-for-devops-course/ssh-demo" ) func main() { var ( err error ) serverKeyBytes, err := ioutil.ReadFile("server.pem") if err != nil { log.Fatalf("Failed to load authorized_keys, err: %v", err) } authorizedKeysBytes, err := ioutil.ReadFile("mykey.pub") if err != nil { log.Fatalf("Failed to load authorized_keys, err: %v", err) } if err = ssh.StartServer(serverKeyBytes, authorizedKeysBytes); err != nil { fmt.Printf("Error: %s\n", err) os.Exit(1) } } ================================================ FILE: ssh-demo/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/ssh-demo go 1.25.4 require ( golang.org/x/crypto v0.45.0 golang.org/x/term v0.37.0 ) require golang.org/x/sys v0.38.0 // indirect ================================================ FILE: ssh-demo/go.sum ================================================ golang.org/x/crypto v0.45.0 h1:jMBrvKuj23MTlT0bQEOBcAE0mjg8mK9RXFhRH6nyF3Q= golang.org/x/crypto v0.45.0/go.mod h1:XTGrrkGJve7CYK7J8PEww4aY7gM3qMCElcJQ8n8JdX4= golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc= golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks= golang.org/x/term v0.37.0 h1:8EGAD0qCmHYZg6J17DvsMy9/wJ7/D/4pV/wfnld5lTU= golang.org/x/term v0.37.0/go.mod h1:5pB4lxRNYYVZuTLmy8oR2BH8dflOR+IbTYFD8fi3254= ================================================ FILE: ssh-demo/keygen.go ================================================ package ssh import ( "crypto/rand" "crypto/rsa" "crypto/x509" "encoding/pem" "golang.org/x/crypto/ssh" ) func GenerateKeys() ([]byte, []byte, error) { privateKey, err := rsa.GenerateKey(rand.Reader, 4096) if err != nil { return nil, nil, err } privateKeyPEM := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)} pubKey, err := ssh.NewPublicKey(&privateKey.PublicKey) if err != nil { return nil, nil, err } return pem.EncodeToMemory(privateKeyPEM), ssh.MarshalAuthorizedKey(pubKey), nil } ================================================ FILE: ssh-demo/server.go ================================================ package ssh import ( "bytes" "fmt" "log" "net" "golang.org/x/crypto/ssh" "golang.org/x/term" ) func StartServer(privateKey []byte, authorizedKeys []byte) error { authorizedKeysMap := map[string]bool{} for len(authorizedKeys) > 0 { pubKey, _, _, rest, err := ssh.ParseAuthorizedKey(authorizedKeys) if err != nil { return fmt.Errorf("Parse Authorized keys error: %s", err) } authorizedKeysMap[string(pubKey.Marshal())] = true authorizedKeys = rest } config := &ssh.ServerConfig{ PublicKeyCallback: func(c ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) { if authorizedKeysMap[string(pubKey.Marshal())] { return &ssh.Permissions{ // Record the public key used for authentication. Extensions: map[string]string{ "pubkey-fp": ssh.FingerprintSHA256(pubKey), }, }, nil } return nil, fmt.Errorf("unknown public key for %q", c.User()) }, } private, err := ssh.ParsePrivateKey(privateKey) if err != nil { return fmt.Errorf("ParsePrivateKey error: %s", err) } config.AddHostKey(private) // Once a ServerConfig has been configured, connections can be // accepted. listener, err := net.Listen("tcp", "0.0.0.0:2022") if err != nil { return fmt.Errorf("Listen error: %s", err) } for { nConn, err := listener.Accept() if err != nil { fmt.Printf("Listener accept error: %s\n", err) } // Before use, a handshake must be performed on the incoming // net.Conn. conn, chans, reqs, err := ssh.NewServerConn(nConn, config) if err != nil { fmt.Printf("NewServerConn error: %s\n", err) } if conn != nil && conn.Permissions != nil { log.Printf("logged in with key %s", conn.Permissions.Extensions["pubkey-fp"]) } // The incoming Request channel must be serviced. go ssh.DiscardRequests(reqs) go handleConnection(conn, chans) } } func handleConnection(conn *ssh.ServerConn, chans <-chan ssh.NewChannel) { // Service the incoming Channel channel. for newChannel := range chans { // Channels have a type, depending on the application level // protocol intended. In the case of a shell, the type is // "session" and ServerShell may be used to present a simple // terminal interface. if newChannel.ChannelType() != "session" { newChannel.Reject(ssh.UnknownChannelType, "unknown channel type") continue } channel, requests, err := newChannel.Accept() if err != nil { fmt.Printf("Could not accept channel: %v\n", err) continue // not shown in demo lecture, but we can skip this loop iteration when there's an error } // Sessions have out-of-band requests such as "shell", // "pty-req" and "env". Here we handle only the // "shell" request. go func(in <-chan *ssh.Request) { for req := range in { fmt.Printf("Request Type made by client: %s\n", req.Type) switch req.Type { case "exec": payload := bytes.TrimPrefix(req.Payload, []byte{0, 0, 0, 6}) channel.Write([]byte(execSomething(conn, payload))) channel.SendRequest("exit-status", false, []byte{0, 0, 0, 0}) req.Reply(true, nil) channel.Close() case "shell": req.Reply(true, nil) case "pty-req": createTerminal(conn, channel) default: req.Reply(false, nil) } } }(requests) } } func createTerminal(conn *ssh.ServerConn, channel ssh.Channel) { termInstance := term.NewTerminal(channel, "> ") go func() { defer channel.Close() for { line, err := termInstance.ReadLine() if err != nil { fmt.Printf("ReadLine error: %s", err) break } switch line { case "whoami": termInstance.Write([]byte(execSomething(conn, []byte("whoami")))) case "": case "quit": termInstance.Write([]byte("Goodbye!\n")) channel.Close() default: termInstance.Write([]byte("Command not found\n")) } } }() } func execSomething(conn *ssh.ServerConn, payload []byte) string { switch string(payload) { case "whoami": return fmt.Sprintf("You are: %s\n", conn.Conn.User()) default: return fmt.Sprintf("Command Not Found: %s\n", string(payload)) } } ================================================ FILE: test-server/Dockerfile ================================================ # # Build go project # FROM golang:1.18-alpine as go-builder WORKDIR /app COPY . . RUN apk add -u -t build-tools curl git && \ go build -o server *.go && \ apk del build-tools && \ rm -rf /var/cache/apk/* # # Runtime container # FROM alpine:latest WORKDIR /app RUN apk --no-cache add ca-certificates COPY --from=go-builder /app/server /app/server EXPOSE 8080 ENTRYPOINT ["/app/server"] ================================================ FILE: test-server/Dockerfile.scratch ================================================ # # Build go project # FROM golang:1.18-alpine as go-builder WORKDIR /app COPY . . RUN apk add -u -t build-tools curl git && \ CGO_ENABLED=0 go build -o server *.go && \ apk del build-tools && \ rm -rf /var/cache/apk/* # # Runtime container # FROM scratch COPY --from=go-builder /app/server /server EXPOSE 8080 ENTRYPOINT ["/server"] ================================================ FILE: test-server/README.md ================================================ # test-server The test server is used in multiple lectures. You can use the following command to start the test-server: ``` ./start-test-server.sh ``` # Notes If you're using zsh, make sure to use quotes around the URL when testing. ================================================ FILE: test-server/assignment1.go ================================================ package main import ( "encoding/json" "fmt" "math/rand" "net/http" "time" ) type assignment1 struct { Page string `json:"page"` Words []string `json:"words"` Percentages map[string]float64 `json:"percentages"` Special []*string `json:"special"` ExtraSpecial []any `json:"extraSpecial"` } func (ct *WordsHandler) assignment1(w http.ResponseWriter, r *http.Request) { one := "one" two := "two" words := []string{"one", "two", "three", "four", "five", "six", "seven", "eigth", "nine", "ten"} numbers := []float64{0.33, 0.66, 0.1, 0, 1, 0.99, 0.88, 0.5, 0.1, 0.2} rand.Seed(time.Now().UnixNano()) percentages := make(map[string]float64) wordsRand := make([]string, 5) for i := 0; i < 5; i++ { randomInt := rand.Intn(9) wordsRand[i] = words[randomInt] percentages[words[randomInt]] = numbers[randomInt] } wordsOutput := assignment1{ Page: "assignment1", Words: wordsRand, Percentages: percentages, Special: []*string{&one, &two, nil}, ExtraSpecial: []any{1, 2, "3"}, } out, err := json.Marshal(wordsOutput) if err != nil { fmt.Fprintf(w, "marshal error") return } fmt.Fprint(w, string(out)) } ================================================ FILE: test-server/go.mod ================================================ module github.com/wardviaene/go-for-devops-course/test-server go 1.25.4 require github.com/golang-jwt/jwt/v4 v4.5.2 ================================================ FILE: test-server/go.sum ================================================ github.com/golang-jwt/jwt/v4 v4.5.2 h1:YtQM7lnr8iZ+j5q71MGKkNw9Mn7AjHM68uc9g5fXeUI= github.com/golang-jwt/jwt/v4 v4.5.2/go.mod h1:m21LjoU+eqJr34lmDMbreY2eSTRJ1cv77w39/MY0Ch0= ================================================ FILE: test-server/main.go ================================================ package main import ( "crypto/rand" "encoding/json" "flag" "fmt" "io" "log" "net" "net/http" "os" "strings" "time" "github.com/golang-jwt/jwt/v4" ) type WordsOutput struct { Page string `json:"page"` Input string `json:"input"` Words []string `json:"words"` } type OccurrenceOutput struct { Page string `json:"page"` Words map[string]int `json:"words"` } type LoginRequest struct { Password string `json:"password"` } type LoginResponse struct { Token string `json:"token"` } type WordsHandler struct { words []string password string tokenSecret []byte } func (ct *WordsHandler) wordsHandler(w http.ResponseWriter, r *http.Request) { input := r.URL.Query().Get("input") if input != "" { ct.words = append(ct.words, input) } wordsOutput := WordsOutput{ Page: "words", Input: input, Words: ct.words, } out, err := json.Marshal(wordsOutput) if err != nil { fmt.Fprintf(w, "marshal error") return } fmt.Fprint(w, string(out)) } func (ct *WordsHandler) indexHandler(w http.ResponseWriter, r *http.Request) { if r.URL.Path != "/" { w.WriteHeader(http.StatusNotFound) fmt.Fprint(w, "404 Not Found") return } fmt.Fprintf(w, "The server is running!") return } func (ct *WordsHandler) occurrenceHandler(w http.ResponseWriter, r *http.Request) { words := make(map[string]int) for _, v := range ct.words { if _, ok := words[v]; ok { words[v]++ } else { words[v] = 1 } } occurrenceOutput := OccurrenceOutput{ Page: "occurrence", Words: words, } out, err := json.Marshal(occurrenceOutput) if err != nil { fmt.Fprintf(w, "marshal error") return } fmt.Fprint(w, string(out)) } func (ct *WordsHandler) login(w http.ResponseWriter, r *http.Request) { if r.Method != "POST" { w.WriteHeader(http.StatusBadRequest) fmt.Fprintf(w, "Not a POST request") return } body, err := io.ReadAll(r.Body) if err != nil { fmt.Fprintf(w, "Readall error") return } var loginRequest LoginRequest err = json.Unmarshal(body, &loginRequest) if err != nil { w.WriteHeader(http.StatusBadRequest) fmt.Fprintf(w, "Unmarshal error") return } if ct.password == "" { w.WriteHeader(http.StatusBadRequest) fmt.Fprintf(w, "start the test-server with a password first") fmt.Printf("Returned HTTP 400 error to client: server has no password set\n") return } if loginRequest.Password != ct.password { w.WriteHeader(http.StatusBadRequest) fmt.Fprintf(w, "Password doesn't match") return } token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{ "nbf": time.Now().Unix(), "exp": time.Now().Add(1 * time.Hour).Unix(), }) tokenString, err := token.SignedString(ct.tokenSecret) if err != nil { w.WriteHeader(http.StatusBadRequest) fmt.Fprintf(w, "Token signing error") return } if err := json.NewEncoder(w).Encode(LoginResponse{Token: tokenString}); err != nil { w.WriteHeader(http.StatusBadRequest) fmt.Fprintf(w, "Token encoding error") return } } func (ct *WordsHandler) authMiddleware(next http.HandlerFunc) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if ct.password != "" { if r.Header.Get("Authorization") == "" { w.WriteHeader(http.StatusForbidden) fmt.Fprintf(w, "Authorization header not set") return } tokenString := strings.Replace(r.Header.Get("Authorization"), "Bearer ", "", -1) _, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) { if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok { return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"]) } return ct.tokenSecret, nil }) if err != nil { w.WriteHeader(http.StatusForbidden) fmt.Fprintf(w, "Authorization token invalid: %s", err) return } } next(w, r) }) } func (wh *WordsHandler) loggingHandler(h http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { if wh.password == "" { log.Println(r.Method, r.URL.Path) } else { log.Println(r.Method, r.URL.Path, "Auth:"+r.Header.Get("Authorization")) } h.ServeHTTP(w, r) }) } func getRandomSecret() []byte { b := make([]byte, 30) _, err := rand.Read(b) if err != nil { log.Fatal(err) } return b } func main() { port := "8080" testListener, err := net.Listen("tcp", ":"+port) if err != nil { fmt.Fprintf(os.Stderr, "Can't start server on port %q: %s\n", port, err) os.Exit(1) } testListener.Close() password := flag.String("password", "", "password protect our API") flag.Parse() wh := &WordsHandler{ words: []string{}, password: *password, tokenSecret: getRandomSecret(), } rl := &RateLimit{ hits: make(map[string]uint64), } mux := http.NewServeMux() mux.Handle("/words", wh.authMiddleware(wh.wordsHandler)) mux.Handle("/occurrence", wh.authMiddleware(wh.occurrenceHandler)) mux.HandleFunc("/assignment1", wh.assignment1) mux.HandleFunc("/ratelimit", rl.ratelimit) mux.HandleFunc("/", wh.indexHandler) mux.HandleFunc("/login", wh.login) fmt.Printf("Starting server on port %v...\n", port) http.ListenAndServe(":"+port, wh.loggingHandler(mux)) } ================================================ FILE: test-server/ratelimit.go ================================================ package main import ( "fmt" "net/http" "sync" "time" ) const DATE_FORMAT = "2006-01-02T15:04:05" type RateLimit struct { mu sync.Mutex hits map[string]uint64 limitExceeded bool limitLifted time.Time } func (rl *RateLimit) ratelimit(w http.ResponseWriter, r *http.Request) { if rl.limitExceeded && time.Now().Before(rl.limitLifted) { w.WriteHeader(429) w.Write([]byte("Rate Limited")) return } if rl.limitExceeded && time.Now().After(rl.limitLifted) { rl.limitExceeded = false } rl.mu.Lock() timestamp := time.Now() strTimestamp := timestamp.Format(DATE_FORMAT) if val, ok := rl.hits[strTimestamp]; ok { if val == 5 { rl.limitExceeded = true rl.limitLifted = time.Now().Add(time.Second * 10) } else { rl.hits[strTimestamp] = val + 1 } } else { rl.hits[strTimestamp] = 1 } rl.mu.Unlock() timestampOneSecondEarlier := time.Now().Add(time.Duration(-1) * time.Second) if rl.hits[timestampOneSecondEarlier.Format(DATE_FORMAT)] == 5 { w.Write([]byte(fmt.Sprintf("DONE! You did it! Hitting API at %d requests in a given second\n", rl.hits[timestampOneSecondEarlier.Format(DATE_FORMAT)]))) } else { w.Write([]byte(fmt.Sprintf("Hitting API at %d requests in a given second\n", rl.hits[timestampOneSecondEarlier.Format(DATE_FORMAT)]))) } if len(rl.hits) > 100000 { rl.mu.Lock() fmt.Printf("Map is getting big, resetting...\n") oldVal := rl.hits[strTimestamp] rl.hits = make(map[string]uint64) rl.hits[strTimestamp] = oldVal time.Sleep(1 * time.Second) rl.mu.Unlock() } } ================================================ FILE: test-server/start-test-server.sh ================================================ #!/bin/sh # ./start-test-server.sh # You can use this script to start the server go get "github.com/golang-jwt/jwt/v4" go run assignment1.go main.go ratelimit.go ================================================ FILE: tls-demo/.gitignore ================================================ /*.pem /*.crt /*.key ================================================ FILE: tls-demo/cmd/letsencrypt-server/main.go ================================================ package main import ( "fmt" "log" "net/http" "golang.org/x/crypto/acme/autocert" ) func index(w http.ResponseWriter, req *http.Request) { fmt.Fprintf(w, "it's working") } func main() { http.HandleFunc("/", index) err := http.Serve(autocert.NewListener("go-demo-test.newtech.academy"), nil) if err != nil { log.Fatal("ListenAndServeTLS error: ", err) } } ================================================ FILE: tls-demo/cmd/mtls-client/main.go ================================================ package main import ( "crypto/tls" "crypto/x509" "fmt" "io" "io/ioutil" "log" "net/http" "time" ) func main() { caBytes, err := ioutil.ReadFile("ca.crt") if err != nil { log.Fatal(err) } ca := x509.NewCertPool() if !ca.AppendCertsFromPEM(caBytes) { log.Fatal("ca.cert not valid") } cert, err := tls.LoadX509KeyPair("client.crt", "client.key") if err != nil { log.Fatal(err) } client := http.Client{ Timeout: 60 * time.Second, Transport: &http.Transport{ TLSClientConfig: &tls.Config{ RootCAs: ca, Certificates: []tls.Certificate{cert}, }, }, } resp, err := client.Get("https://go-demo.localtest.me/common-name") if err != nil { log.Fatal(err) } defer resp.Body.Close() body, err := io.ReadAll(resp.Body) fmt.Printf("Body (status %d): %s\n", resp.StatusCode, body) } ================================================ FILE: tls-demo/cmd/mtls-server/main.go ================================================ package main import ( "crypto/tls" "crypto/x509" "fmt" "io/ioutil" "log" "net/http" ) func index(w http.ResponseWriter, req *http.Request) { fmt.Fprintf(w, "it's working") } func showCommonName(w http.ResponseWriter, req *http.Request) { var commonName string if req.TLS != nil && len(req.TLS.VerifiedChains) > 0 && len(req.TLS.VerifiedChains[0]) > 0 { commonName = req.TLS.VerifiedChains[0][0].Subject.CommonName } fmt.Fprintf(w, "Your common name: %s", commonName) } func main() { caBytes, err := ioutil.ReadFile("ca.crt") if err != nil { log.Fatal(err) } ca := x509.NewCertPool() if !ca.AppendCertsFromPEM(caBytes) { log.Fatal("ca.cert not valid") } http.HandleFunc("/", index) http.HandleFunc("/common-name", showCommonName) server := http.Server{ Addr: ":443", TLSConfig: &tls.Config{ ClientAuth: tls.RequireAndVerifyClientCert, ClientCAs: ca, MinVersion: tls.VersionTLS13, }, } err = server.ListenAndServeTLS("server.crt", "server.key") if err != nil { log.Fatal("ListenAndServeTLS error: ", err) } } ================================================ FILE: tls-demo/cmd/test-server/main.go ================================================ package main import ( "fmt" "log" "net/http" ) func index(w http.ResponseWriter, req *http.Request) { fmt.Fprintf(w, "it's working") } func main() { http.HandleFunc("/", index) err := http.ListenAndServeTLS(":443", "server.crt", "server.key", nil) if err != nil { log.Fatal("ListenAndServeTLS error: ", err) } } ================================================ FILE: tls-demo/cmd/tls/main.go ================================================ package main import ( "github.com/wardviaene/golang-for-devops-course/tls-demo/pkg/cmd" ) func main() { cmd.Execute() } ================================================ FILE: tls-demo/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/tls-demo replace github.com/golang/mock v1.4.3 => github.com/golang/mock v1.4.4 go 1.25.4 require ( github.com/spf13/cobra v1.3.0 golang.org/x/crypto v0.45.0 gopkg.in/yaml.v2 v2.4.0 ) require ( github.com/inconshreveable/mousetrap v1.0.0 // indirect github.com/spf13/pflag v1.0.5 // indirect golang.org/x/net v0.47.0 // indirect golang.org/x/text v0.31.0 // indirect ) ================================================ FILE: tls-demo/go.sum ================================================ cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 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h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI= gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k= gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY= gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg= honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k= rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8= rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= ================================================ FILE: tls-demo/pkg/cert/pem.go ================================================ package cert import ( "crypto/x509" "encoding/pem" "fmt" ) func PemToX509(input []byte) (*x509.Certificate, error) { block, _ := pem.Decode(input) if block == nil { return nil, fmt.Errorf("failed to parse certificate PEM") } return x509.ParseCertificate(block.Bytes) } ================================================ FILE: tls-demo/pkg/cert/types.go ================================================ package cert import "math/big" type CACert struct { Serial *big.Int `yaml:"serial"` ValidForYears int `yaml:"validForYears"` Subject CertSubject `yaml:"subject"` } type Cert struct { Serial *big.Int `yaml:"serial"` ValidForYears int `yaml:"validForYears"` Subject CertSubject `yaml:"subject"` DNSNames []string `yaml:"dnsNames"` } type CertSubject struct { Country string `yaml:"country"` Organization string `yaml:"organization"` OrganizationalUnit string `yaml:"organizationalUnit"` Locality string `yaml:"locality"` Province string `yaml:"province"` StreetAddress string `yaml:"streetAddress"` PostalCode string `yaml:"postalCode"` SerialNumber string `yaml:"serialNumber"` CommonName string `yaml:"commonName"` } ================================================ FILE: tls-demo/pkg/cert/x509.go ================================================ package cert import ( "bytes" "crypto/rand" "crypto/rsa" "crypto/x509" "crypto/x509/pkix" "encoding/pem" "io/ioutil" "time" "github.com/wardviaene/golang-for-devops-course/tls-demo/pkg/key" ) func CreateCACert(ca *CACert, keyFilePath, caCertFilePath string) error { template := &x509.Certificate{ SerialNumber: ca.Serial, Subject: pkix.Name{ Country: removeEmptyString([]string{ca.Subject.Country}), Organization: removeEmptyString([]string{ca.Subject.Organization}), OrganizationalUnit: removeEmptyString([]string{ca.Subject.OrganizationalUnit}), Locality: removeEmptyString([]string{ca.Subject.Locality}), Province: removeEmptyString([]string{ca.Subject.Province}), StreetAddress: removeEmptyString([]string{ca.Subject.StreetAddress}), PostalCode: removeEmptyString([]string{ca.Subject.PostalCode}), CommonName: ca.Subject.CommonName, }, NotBefore: time.Now(), NotAfter: time.Now().AddDate(ca.ValidForYears, 0, 0), IsCA: true, ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign, BasicConstraintsValid: true, } keyBytes, certBytes, err := createCert(template, nil, nil) if err != nil { return err } if err := ioutil.WriteFile(keyFilePath, keyBytes, 0600); err != nil { return err } if err := ioutil.WriteFile(caCertFilePath, certBytes, 0644); err != nil { return err } return nil } func CreateCert(cert *Cert, caKey []byte, caCert []byte, keyFilePath, certFilePath string) error { template := &x509.Certificate{ SerialNumber: cert.Serial, Subject: pkix.Name{ Country: removeEmptyString([]string{cert.Subject.Country}), Organization: removeEmptyString([]string{cert.Subject.Organization}), OrganizationalUnit: removeEmptyString([]string{cert.Subject.OrganizationalUnit}), Locality: removeEmptyString([]string{cert.Subject.Locality}), Province: removeEmptyString([]string{cert.Subject.Province}), StreetAddress: removeEmptyString([]string{cert.Subject.StreetAddress}), PostalCode: removeEmptyString([]string{cert.Subject.PostalCode}), CommonName: cert.Subject.CommonName, }, NotBefore: time.Now(), NotAfter: time.Now().AddDate(cert.ValidForYears, 0, 0), ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageServerAuth}, KeyUsage: x509.KeyUsageDigitalSignature, DNSNames: removeEmptyString(cert.DNSNames), } caKeyParsed, err := key.PrivateKeyPemToRSA(caKey) if err != nil { return err } caCertParsed, err := PemToX509(caCert) if err != nil { return err } keyBytes, certBytes, err := createCert(template, caKeyParsed, caCertParsed) if err != nil { return err } if err := ioutil.WriteFile(keyFilePath, keyBytes, 0600); err != nil { return err } if err := ioutil.WriteFile(certFilePath, certBytes, 0644); err != nil { return err } return nil } func createCert(template *x509.Certificate, caKey *rsa.PrivateKey, caCert *x509.Certificate) ([]byte, []byte, error) { var ( derBytes []byte certOut bytes.Buffer keyOut bytes.Buffer ) privateKey, err := key.CreateRSAPrivateKey(4096) if err != nil { return nil, nil, err } if template.IsCA { derBytes, err = x509.CreateCertificate(rand.Reader, template, template, &privateKey.PublicKey, privateKey) if err != nil { return nil, nil, err } } else { derBytes, err = x509.CreateCertificate(rand.Reader, template, caCert, &privateKey.PublicKey, caKey) if err != nil { return nil, nil, err } } if err = pem.Encode(&certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil { return nil, nil, err } if err = pem.Encode(&keyOut, key.RSAPrivateKeyToPEM(privateKey)); err != nil { return nil, nil, err } return keyOut.Bytes(), certOut.Bytes(), nil } func removeEmptyString(input []string) []string { if len(input) == 1 && input[0] == "" { return []string{} } return input } ================================================ FILE: tls-demo/pkg/cmd/ca.go ================================================ package cmd import ( "fmt" "github.com/spf13/cobra" "github.com/wardviaene/golang-for-devops-course/tls-demo/pkg/cert" ) var caKey string var caCert string func init() { createCmd.AddCommand(caCreateCmd) caCreateCmd.Flags().StringVarP(&caKey, "key-out", "k", "ca.key", "destination path for ca key") caCreateCmd.Flags().StringVarP(&caCert, "cert-out", "o", "ca.crt", "destination path for ca cert") } var caCreateCmd = &cobra.Command{ Use: "ca", Short: "ca commands", Long: `commands to create the CA`, Run: func(cmd *cobra.Command, args []string) { err := cert.CreateCACert(config.CACert, caKey, caCert) if err != nil { fmt.Printf("Create CA error: %s\n", err) return } fmt.Printf("CA created. Key: %s, cert: %s\n", caKey, caCert) }, } ================================================ FILE: tls-demo/pkg/cmd/cert.go ================================================ package cmd import ( "fmt" "io/ioutil" "github.com/spf13/cobra" "github.com/wardviaene/golang-for-devops-course/tls-demo/pkg/cert" ) var certKeyPath string var certPath string var certName string func init() { createCmd.AddCommand(certCreateCmd) certCreateCmd.Flags().StringVarP(&certKeyPath, "key-out", "k", "server.key", "destination path for cert key") certCreateCmd.Flags().StringVarP(&certPath, "cert-out", "o", "server.crt", "destination path for cert cert") certCreateCmd.Flags().StringVarP(&certName, "name", "n", "", "name of the certificate in the config file") certCreateCmd.Flags().StringVar(&caKey, "ca-key", "ca.key", "ca key to sign certificate") certCreateCmd.Flags().StringVar(&caCert, "ca-cert", "ca.crt", "ca cert for certificate") certCreateCmd.MarkFlagRequired("ca-key") certCreateCmd.MarkFlagRequired("ca-cert") certCreateCmd.MarkFlagRequired("name") } var certCreateCmd = &cobra.Command{ Use: "cert", Short: "cert commands", Long: `commands to create the certificates`, Run: func(cmd *cobra.Command, args []string) { caKeyBytes, err := ioutil.ReadFile(caKey) if err != nil { fmt.Printf("CA key read error: %s\n", err) return } caCertBytes, err := ioutil.ReadFile(caCert) if err != nil { fmt.Printf("CA cert read error: %s\n", err) return } certConfig, ok := config.Cert[certName] if !ok { fmt.Printf("Could not find certificate name in config\n") return } err = cert.CreateCert(certConfig, caKeyBytes, caCertBytes, certKeyPath, certPath) if err != nil { fmt.Printf("Create cert error: %s\n", err) return } fmt.Printf("Cert created. Key: %s, cert: %s\n", certKeyPath, certPath) }, } ================================================ FILE: tls-demo/pkg/cmd/create.go ================================================ package cmd import "github.com/spf13/cobra" func init() { rootCmd.AddCommand(createCmd) } var createCmd = &cobra.Command{ Use: "create", Short: "create CA, certs, or keys", Long: `commands to create resources (ca, certs, keys)`, } ================================================ FILE: tls-demo/pkg/cmd/key.go ================================================ package cmd import ( "fmt" "github.com/spf13/cobra" "github.com/wardviaene/golang-for-devops-course/tls-demo/pkg/key" ) var keyOut string var keyLength int func init() { createCmd.AddCommand(keyCreateCmd) keyCreateCmd.Flags().StringVarP(&keyOut, "key-out", "k", "key.pem", "destination path for key") keyCreateCmd.Flags().IntVarP(&keyLength, "key-length", "l", 4096, "key length") } var keyCreateCmd = &cobra.Command{ Use: "key", Short: "key commands", Long: `commands to create keys`, Run: func(cmd *cobra.Command, args []string) { err := key.CreateRSAPrivateKeyAndSave(keyOut, keyLength) if err != nil { fmt.Printf("Create key error: %s\n", err) return } fmt.Printf("Key created %s with length %d\n", keyOut, keyLength) }, } ================================================ FILE: tls-demo/pkg/cmd/root.go ================================================ package cmd import ( "fmt" "io/ioutil" "os" "github.com/spf13/cobra" "github.com/wardviaene/golang-for-devops-course/tls-demo/pkg/cert" "gopkg.in/yaml.v2" ) type Config struct { CACert *cert.CACert `yaml:"caCert"` Cert map[string]*cert.Cert `yaml:"certs"` } var cfgFilePath string var config Config var rootCmd = &cobra.Command{ Use: "tls", Short: "tls is a command line tool for TLS.", Long: `tls is a command line tool for TLS. Mainly used for generation of X.509 certificates, but can be extended`, } func Execute() { if err := rootCmd.Execute(); err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(1) } } func init() { cobra.OnInitialize(initConfig) rootCmd.PersistentFlags().StringVarP(&cfgFilePath, "config", "c", "", "config file (default is tls.yaml)") } func initConfig() { if cfgFilePath == "" { cfgFilePath = "tls.yaml" } cfgFileBytes, err := ioutil.ReadFile(cfgFilePath) if err != nil { fmt.Printf("Error while reading config file: %s\n", err) return } err = yaml.Unmarshal(cfgFileBytes, &config) if err != nil { fmt.Printf("Error while parsing config file: %s\n", err) return } } ================================================ FILE: tls-demo/pkg/key/rsa.go ================================================ package key import ( "crypto/rand" "crypto/rsa" "crypto/x509" "encoding/pem" "fmt" "os" ) func CreateRSAPrivateKey(n int) (*rsa.PrivateKey, error) { if n < 2048 { return nil, fmt.Errorf("RSA key length too small: %d bits. Minimum is 2048 bits", n) } return rsa.GenerateKey(rand.Reader, n) } func RSAPrivateKeyToPEM(privateKey *rsa.PrivateKey) *pem.Block { return &pem.Block{ Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey), } } func CreateRSAPrivateKeyAndSave(path string, n int) error { if n < 2048 { return fmt.Errorf("RSA key length too small: %d bits. Minimum is 2048 bits", n) } privateKey, err := CreateRSAPrivateKey(n) if err != nil { return err } f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0600) if err != nil { return err } if err := pem.Encode(f, RSAPrivateKeyToPEM(privateKey)); err != nil { return err } if err := f.Close(); err != nil { return err } return nil } func PrivateKeyPemToRSA(input []byte) (*rsa.PrivateKey, error) { var parsedKey *rsa.PrivateKey var err error privPem, _ := pem.Decode(input) if privPem.Type != "RSA PRIVATE KEY" { return nil, fmt.Errorf("RSA private key is of the wrong type: %s", privPem.Type) } if parsedKey, err = x509.ParsePKCS1PrivateKey(privPem.Bytes); err != nil { return nil, fmt.Errorf("Unable to parse RSA private key: %v", err) } return parsedKey, nil } ================================================ FILE: tls-demo/tls.yaml ================================================ caCert: serial: 1 validForYears: 10 subject: country: US organization: Golang Demo Org organizationalUnit: Certificate Management locality: NY commonName: CA Certificate certs: go-demo.localtest.me: serial: 1 validForYears: 1 dnsNames: ["go-demo.localtest.me", "go-demo-2.localtest.me"] subject: country: US organization: Golang Demo Org organizationalUnit: go-demo department locality: NY commonName: go-demo.localtest.me go-demo-client.localtest.me: serial: 1 validForYears: 1 subject: country: US organization: Golang Demo Org organizationalUnit: go-demo department locality: NY commonName: go-demo-client.localtest.me ================================================ FILE: tls-start/.gitignore ================================================ /*.pem /*.crt /*.key ================================================ FILE: tls-start/cmd/test-server/main.go ================================================ package main import ( "fmt" "log" "net/http" ) func index(w http.ResponseWriter, req *http.Request) { fmt.Fprintf(w, "it's working") } func main() { http.HandleFunc("/", index) err := http.ListenAndServeTLS(":443", "server.crt", "server.key", nil) if err != nil { log.Fatal("ListenAndServeTLS error: ", err) } } ================================================ FILE: tls-start/cmd/tls/main.go ================================================ package main import ( "github.com/wardviaene/golang-for-devops-course/tls-start/pkg/cmd" ) func main() { cmd.Execute() } ================================================ FILE: tls-start/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/tls-start replace github.com/golang/mock v1.4.3 => github.com/golang/mock v1.4.4 go 1.25.4 ================================================ FILE: tls-start/go.sum ================================================ ================================================ FILE: tls-start/pkg/cert/pem.go ================================================ package cert import ( "crypto/x509" "encoding/pem" "fmt" ) func PemToX509(input []byte) (*x509.Certificate, error) { block, _ := pem.Decode(input) if block == nil { return nil, fmt.Errorf("failed to parse certificate PEM") } return x509.ParseCertificate(block.Bytes) } ================================================ FILE: tls-start/pkg/cert/types.go ================================================ package cert import "math/big" type CACert struct { Serial *big.Int `yaml:"serial"` ValidForYears int `yaml:"validForYears"` Subject CertSubject `yaml:"subject"` } type Cert struct { Serial *big.Int `yaml:"serial"` ValidForYears int `yaml:"validForYears"` Subject CertSubject `yaml:"subject"` DNSNames []string `yaml:"dnsNames"` } type CertSubject struct { Country string `yaml:"country"` Organization string `yaml:"organization"` OrganizationalUnit string `yaml:"organizationalUnit"` Locality string `yaml:"locality"` Province string `yaml:"province"` StreetAddress string `yaml:"streetAddress"` PostalCode string `yaml:"postalCode"` SerialNumber string `yaml:"serialNumber"` CommonName string `yaml:"commonName"` } ================================================ FILE: tls-start/pkg/cert/x509.go ================================================ package cert func CreateCACert(ca *CACert, keyFilePath, caCertFilePath string) error { return nil } func CreateCert(cert *Cert, caKey []byte, caCert []byte, keyFilePath, certFilePath string) error { return nil } ================================================ FILE: tls-start/pkg/cmd/root.go ================================================ package cmd func Execute() { } ================================================ FILE: tls-start/pkg/key/rsa.go ================================================ package key import ( "crypto/rand" "crypto/rsa" "crypto/x509" "encoding/pem" "fmt" "os" ) func CreateRSAPrivateKey(n int) (*rsa.PrivateKey, error) { return rsa.GenerateKey(rand.Reader, n) } func RSAPrivateKeyToPEM(privateKey *rsa.PrivateKey) *pem.Block { return &pem.Block{ Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey), } } func CreateRSAPrivateKeyAndSave(path string, n int) error { privateKey, err := CreateRSAPrivateKey(n) if err != nil { return err } f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, 0600) if err != nil { return err } if err := pem.Encode(f, RSAPrivateKeyToPEM(privateKey)); err != nil { return err } if err := f.Close(); err != nil { return err } return nil } func PrivateKeyPemToRSA(input []byte) (*rsa.PrivateKey, error) { var parsedKey *rsa.PrivateKey var err error privPem, _ := pem.Decode(input) if privPem.Type != "RSA PRIVATE KEY" { return nil, fmt.Errorf("RSA private key is of the wrong type: %s", privPem.Type) } if parsedKey, err = x509.ParsePKCS1PrivateKey(privPem.Bytes); err != nil { return nil, fmt.Errorf("Unable to parse RSA private key: %v", err) } return parsedKey, nil } ================================================ FILE: tls-start/tls.yaml ================================================ caCert: serial: 1 validForYears: 10 subject: country: US organization: Golang Demo Org organizationalUnit: Certificate Management locality: NY commonName: CA Certificate certs: go-demo.localtest.me: serial: 1 validForYears: 1 dnsNames: ["go-demo.localtest.me", "go-demo-2.localtest.me"] subject: country: US organization: Golang Demo Org organizationalUnit: go-demo department locality: NY commonName: go-demo.localtest.me ================================================ FILE: types-demo/cmd/generics/main.go ================================================ package main import ( "fmt" "reflect" ) func main() { var t1 int = 123 fmt.Printf("plusOne: %v (type: %s)\n", plusOne(t1), reflect.TypeOf(plusOne(t1))) var t2 float64 = 123.12 fmt.Printf("plusOne: %v (type: %s)\n", plusOne(t2), reflect.TypeOf(plusOne(t2))) fmt.Printf("sum: %v (type: %s)\n", sum(t1, t1), reflect.TypeOf(sum(t1, t1))) fmt.Printf("sum: %v (type: %s)\n", sum(t2, t2), reflect.TypeOf(sum(t2, t2))) //fmt.Printf("sum: %v (type: %s)\n", sum(t1, t2), reflect.TypeOf(sum(t1, t2))) } func plusOne[V int | float64 | int64 | float32 | int32](t V) V { return t + 1 } func sum[V int | float64 | int64 | float32 | int32](t1 V, t2 V) V { return t1 + t2 } ================================================ FILE: types-demo/cmd/json-parsing/main.go ================================================ package main import ( "encoding/json" "fmt" "log" "reflect" ) type MyJson struct { Test any `json:"test"` Test3 string `json:"test3"` } func main() { var jsonParsed MyJson err := json.Unmarshal([]byte(`{"test": { "test2": [1,2,3] }, "test3": "..." }`), &jsonParsed) if err != nil { log.Fatal(err) } switch v := jsonParsed.Test.(type) { case map[string]any: fmt.Printf("Map found: %v\n", v) field1, ok := v["test2"] if ok { switch v2 := field1.(type) { case []any: fmt.Printf("I found a []any\n") for _, v2Element := range v2 { fmt.Printf("Type: %s\n", reflect.TypeOf(v2Element)) if reflect.TypeOf(v2Element).String() == "float64" { fmt.Printf("Int: %d\n", int(v2Element.(float64))) } else { fmt.Printf("Didn't recognize v2Element\n") } } default: fmt.Printf("Type not found: %s\n", reflect.TypeOf(v2)) } } default: fmt.Printf("Type not found: %s\n", reflect.TypeOf(jsonParsed)) } } ================================================ FILE: types-demo/cmd/type-switch/main.go ================================================ package main import ( "fmt" "reflect" ) func main() { var t1 string = "this is a string" var t2 *string = &t1 discoverType(t2) var t3 int = 123 discoverType(t3) discoverType(nil) } func discoverType(t any) { switch v := t.(type) { case string: t2 := v + "..." fmt.Printf("String found: %s\n", t2) case *string: fmt.Printf("Pointer string found: %s\n", *v) case int: fmt.Printf("We have an integer: %d\n", v) default: myType := reflect.TypeOf(t) if myType == nil { fmt.Printf("type is nil\n") } else { fmt.Printf("Type not found: %s\n", myType) } } } ================================================ FILE: types-demo/go.mod ================================================ module github.com/wardviaene/golang-for-devops-course/types-demo go 1.19