[
{
"path": ".gitignore",
"content": ".DS_Store\n*.swp\n"
},
{
"path": "CHANGELOG.md",
"content": "# 2022-09-14 (v1.0.0)\n\n* Create Go module.\n\n# 2016-05-03\n\n* Add the PNG/JPEG thumbnail methods to *Image.\n"
},
{
"path": "LICENSE",
"content": "Copyright (c) 2022. All rights reserved.\n\nRedistribution and use in source and binary forms, with or without\nmodification, are permitted provided that the following conditions are met:\n\n Redistributions of source code must retain the above copyright notice, this\n list of conditions and the following disclaimer.\n\n Redistributions in binary form must reproduce the above copyright notice,\n this list of conditions and the following disclaimer in the documentation\n and/or other materials provided with the distribution.\n\nTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND\nANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\nWARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\nDISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE\nFOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\nDAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR\nSERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER\nCAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\nOR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\nOF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n"
},
{
"path": "README.md",
"content": "# go-imageupload\n\n[](https://godoc.org/github.com/olahol/go-imageupload)\n\n> :white_square_button: Gracefully handle image uploading and thumbnail creation.\n\n## Install\n\n```bash\ngo get github.com/olahol/go-imageupload\n```\n\n## [Example](https://github.com/olahol/go-imageupload/tree/master/examples)\n\nThumbnail creator.\n\n```go\npackage main\n\nimport (\n\t\"net/http\"\n\n\t\"github.com/olahol/go-imageupload\"\n)\n\nfunc main() {\n\thttp.HandleFunc(\"/\", func(w http.ResponseWriter, r *http.Request) {\n\t\thttp.ServeFile(w, r, \"index.html\")\n\t})\n\n\thttp.HandleFunc(\"/upload\", func(w http.ResponseWriter, r *http.Request) {\n\t\tif r.Method != \"POST\" {\n\t\t\thttp.NotFound(w, r)\n\t\t\treturn\n\t\t}\n\n\t\timg, err := imageupload.Process(r, \"file\")\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tthumb, err := imageupload.ThumbnailPNG(img, 300, 300)\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tthumb.Write(w)\n\t})\n\n\thttp.ListenAndServe(\":5000\", nil)\n}\n```\n\n```html\n\n\n \n\n\n```\n\n## Contributors\n\n* Ola Holmström (@olahol)\n* Shintaro Kaneko (@kaneshin)\n\n\n## [Documentation](https://godoc.org/github.com/olahol/go-imageupload)\n"
},
{
"path": "examples/save/index.html",
"content": "\n\n\n \n\n\n"
},
{
"path": "examples/save/main.go",
"content": "package main\n\nimport (\n\t\"fmt\"\n\t\"net/http\"\n\t\"time\"\n\n\t\"github.com/olahol/go-imageupload\"\n)\n\nfunc main() {\n\thttp.HandleFunc(\"/\", func(w http.ResponseWriter, r *http.Request) {\n\t\thttp.ServeFile(w, r, \"index.html\")\n\t})\n\n\thttp.HandleFunc(\"/upload\", func(w http.ResponseWriter, r *http.Request) {\n\t\tif r.Method != \"POST\" {\n\t\t\thttp.NotFound(w, r)\n\t\t\treturn\n\t\t}\n\n\t\timg, err := imageupload.Process(r, \"file\")\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tthumb, err := imageupload.ThumbnailPNG(img, 300, 300)\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tthumb.Save(fmt.Sprintf(\"%d.png\", time.Now().Unix()))\n\n\t\thttp.Redirect(w, r, \"/\", http.StatusMovedPermanently)\n\t})\n\n\thttp.ListenAndServe(\":5000\", nil)\n}\n"
},
{
"path": "examples/simple/index.html",
"content": "\n\n\n \n\n ![](\"/thumbnail\")
\n\n\n"
},
{
"path": "examples/simple/main.go",
"content": "package main\n\nimport (\n\t\"net/http\"\n\n\t\"github.com/olahol/go-imageupload\"\n)\n\nvar currentImage *imageupload.Image\n\nfunc main() {\n\thttp.HandleFunc(\"/\", func(w http.ResponseWriter, r *http.Request) {\n\t\thttp.ServeFile(w, r, \"index.html\")\n\t})\n\n\thttp.HandleFunc(\"/image\", func(w http.ResponseWriter, r *http.Request) {\n\t\tif currentImage == nil {\n\t\t\thttp.NotFound(w, r)\n\t\t\treturn\n\t\t}\n\n\t\tcurrentImage.Write(w)\n\t})\n\n\thttp.HandleFunc(\"/thumbnail\", func(w http.ResponseWriter, r *http.Request) {\n\t\tif currentImage == nil {\n\t\t\thttp.NotFound(w, r)\n\t\t\treturn\n\t\t}\n\n\t\tt, err := imageupload.ThumbnailJPEG(currentImage, 300, 300, 80)\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tt.Write(w)\n\t})\n\n\thttp.HandleFunc(\"/upload\", func(w http.ResponseWriter, r *http.Request) {\n\t\tif r.Method != \"POST\" {\n\t\t\thttp.NotFound(w, r)\n\t\t\treturn\n\t\t}\n\n\t\timg, err := imageupload.Process(r, \"file\")\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tcurrentImage = img\n\n\t\thttp.Redirect(w, r, \"/\", http.StatusMovedPermanently)\n\t})\n\n\thttp.ListenAndServe(\":5000\", nil)\n}\n"
},
{
"path": "examples/thumbnailer/index.html",
"content": "\n\n \n\n\n"
},
{
"path": "examples/thumbnailer/main.go",
"content": "package main\n\nimport (\n\t\"net/http\"\n\n\t\"github.com/olahol/go-imageupload\"\n)\n\nfunc main() {\n\thttp.HandleFunc(\"/\", func(w http.ResponseWriter, r *http.Request) {\n\t\thttp.ServeFile(w, r, \"index.html\")\n\t})\n\n\thttp.HandleFunc(\"/upload\", func(w http.ResponseWriter, r *http.Request) {\n\t\tif r.Method != \"POST\" {\n\t\t\thttp.NotFound(w, r)\n\t\t\treturn\n\t\t}\n\n\t\timg, err := imageupload.Process(r, \"file\")\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tthumb, err := imageupload.ThumbnailPNG(img, 300, 300)\n\n\t\tif err != nil {\n\t\t\tpanic(err)\n\t\t}\n\n\t\tthumb.Write(w)\n\t})\n\n\thttp.ListenAndServe(\":5000\", nil)\n}\n"
},
{
"path": "go.mod",
"content": "module github.com/olahol/go-imageupload\n\ngo 1.19\n\nrequire github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646\n"
},
{
"path": "go.sum",
"content": "github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=\ngithub.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=\n"
},
{
"path": "imageupload.go",
"content": "// Gracefully handle image uploading and thumbnail creation.\npackage imageupload\n\nimport (\n\t\"bytes\"\n\t\"encoding/base64\"\n\t\"errors\"\n\t\"fmt\"\n\t\"github.com/nfnt/resize\"\n\t\"image\"\n\t_ \"image/gif\"\n\t\"image/jpeg\"\n\t\"image/png\"\n\t\"io/ioutil\"\n\t\"net/http\"\n\t\"strconv\"\n)\n\ntype Image struct {\n\tFilename string\n\tContentType string\n\tData []byte\n\tSize int\n}\n\n// Save image to file.\nfunc (i *Image) Save(filename string) error {\n\treturn ioutil.WriteFile(filename, i.Data, 0600)\n}\n\n// Convert image to base64 data uri.\nfunc (i *Image) DataURI() string {\n\treturn fmt.Sprintf(\"data:%s;base64,%s\", i.ContentType, base64.StdEncoding.EncodeToString(i.Data))\n}\n\n// Write image to HTTP response.\nfunc (i *Image) Write(w http.ResponseWriter) {\n\tw.Header().Set(\"Content-Type\", i.ContentType)\n\tw.Header().Set(\"Content-Length\", strconv.Itoa(i.Size))\n\tw.Write(i.Data)\n}\n\n// Create JPEG thumbnail from image.\nfunc (i *Image) ThumbnailJPEG(width int, height int, quality int) (*Image, error) {\n\treturn ThumbnailJPEG(i, width, height, quality)\n}\n\n// Create PNG thumbnail from image.\nfunc (i *Image) ThumbnailPNG(width int, height int) (*Image, error) {\n\treturn ThumbnailPNG(i, width, height)\n}\n\n// Limit the size of uploaded files, put this before imageupload.Process.\nfunc LimitFileSize(maxSize int64, w http.ResponseWriter, r *http.Request) {\n\tr.Body = http.MaxBytesReader(w, r.Body, maxSize)\n}\n\nfunc okContentType(contentType string) bool {\n\treturn contentType == \"image/png\" || contentType == \"image/jpeg\" || contentType == \"image/gif\"\n}\n\n// Process uploaded file into an image.\nfunc Process(r *http.Request, field string) (*Image, error) {\n\tfile, info, err := r.FormFile(field)\n\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\tcontentType := info.Header.Get(\"Content-Type\")\n\n\tif !okContentType(contentType) {\n\t\treturn nil, errors.New(fmt.Sprintf(\"Wrong content type: %s\", contentType))\n\t}\n\n\tbs, err := ioutil.ReadAll(file)\n\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\t_, _, err = image.Decode(bytes.NewReader(bs))\n\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\ti := &Image{\n\t\tFilename: info.Filename,\n\t\tContentType: contentType,\n\t\tData: bs,\n\t\tSize: len(bs),\n\t}\n\n\treturn i, nil\n}\n\n// Create JPEG thumbnail.\nfunc ThumbnailJPEG(i *Image, width int, height int, quality int) (*Image, error) {\n\timg, _, err := image.Decode(bytes.NewReader(i.Data))\n\n\tthumbnail := resize.Thumbnail(uint(width), uint(height), img, resize.Lanczos3)\n\n\tdata := new(bytes.Buffer)\n\terr = jpeg.Encode(data, thumbnail, &jpeg.Options{\n\t\tQuality: quality,\n\t})\n\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\tbs := data.Bytes()\n\n\tt := &Image{\n\t\tFilename: \"thumbnail.jpg\",\n\t\tContentType: \"image/jpeg\",\n\t\tData: bs,\n\t\tSize: len(bs),\n\t}\n\n\treturn t, nil\n}\n\n// Create PNG thumbnail.\nfunc ThumbnailPNG(i *Image, width int, height int) (*Image, error) {\n\timg, _, err := image.Decode(bytes.NewReader(i.Data))\n\n\tthumbnail := resize.Thumbnail(uint(width), uint(height), img, resize.Lanczos3)\n\n\tdata := new(bytes.Buffer)\n\terr = png.Encode(data, thumbnail)\n\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\n\tbs := data.Bytes()\n\n\tt := &Image{\n\t\tFilename: \"thumbnail.png\",\n\t\tContentType: \"image/png\",\n\t\tData: bs,\n\t\tSize: len(bs),\n\t}\n\n\treturn t, nil\n}\n"
}
]