Full Code of yvele/azure-function-express for AI

Repository: yvele/azure-function-express
Branch: master
Commit: 349ae0b07035
Files: 30
Total size: 49.0 KB

Directory structure:
gitextract_in6ieqkr/

├── .babelrc.js
├── .editorconfig
├── .eslintrc.js
├── .gitattributes
├── .gitignore
├── .nvmrc
├── .travis.yml
├── CHANGELOG.md
├── CONTRIBUTING.md
├── LICENSE
├── README.md
├── docs/
│   └── azure-function.md
├── examples/
│   ├── all-routes/
│   │   ├── function.json
│   │   └── index.js
│   ├── basic/
│   │   ├── function.json
│   │   └── index.js
│   └── basic-module/
│       ├── function.json
│       └── index.js
├── package.json
├── src/
│   ├── ExpressAdapter.js
│   ├── IncomingMessage.js
│   ├── OutgoingMessage.js
│   ├── createAzureFunctionHandler.js
│   ├── index.js
│   └── statusCodes.js
└── test/
    ├── ExpressAdapter.test.js
    ├── IncomingMessage.test.js
    ├── OutgoingMessage.test.js
    ├── expressIntegration.test.js
    └── main.test.js

================================================
FILE CONTENTS
================================================

================================================
FILE: .babelrc.js
================================================
module.exports = {
  presets : [[
    "@babel/preset-env", {
      loose : true,
      useBuiltIns : "entry",
      targets : {
        node : "6.11" // Minimum supported version
      }
    }
  ]],
  plugins : [
    ["@babel/plugin-proposal-export-default-from", { loose: true }],
    ["@babel/plugin-proposal-export-namespace-from", { loose: true }],
    ["@babel/plugin-proposal-object-rest-spread", { loose: true }],
    ["add-module-exports", { loose: true }]
  ]
};


================================================
FILE: .editorconfig
================================================
root = true

[*]
charset = utf-8
indent_style = space
indent_size = 2
end_of_line = lf
insert_final_newline = true
trim_trailing_whitespace = true
max_line_length=80

[*.md]
insert_final_newline = false
trim_trailing_whitespace = false


================================================
FILE: .eslintrc.js
================================================
module.exports = {
  parser  : "babel-eslint",
  extends : "airbnb-base",
  rules   : {

    // Enforce the consistent use of double quotes
    quotes : ["error", "double", { avoidEscape: true }],

    // Allow bitwise operators
    "no-bitwise"  : "off",

    // Allow the unary operators ++ and --
    "no-plusplus" : "off",

    // Require or disallow trailing commas
    "comma-dangle": ["error", "only-multiline"],

    // Disallow Reassignment of Function Parameters
    "no-param-reassign" : ["error", { props: false }],

    // Enforce consistent spacing between keys and values in object literal properties
    "key-spacing" : ["error", {
      singleLine : {
        beforeColon : false,
        afterColon  : true
      },
      multiLine : {
        beforeColon : true,
        afterColon  : true,
        mode        : "minimum"
      }
    }],

    // Disallow multiple spaces
    "no-multi-spaces" : ["error", { ignoreEOLComments: true }],

    // Require or disallow padding within blocks
    "padded-blocks": ["error", { classes: "always" }]
  }
};


================================================
FILE: .gitattributes
================================================
# Auto detect text files and perform LF normalization
* text=auto


================================================
FILE: .gitignore
================================================
# Logs
*.log
npm-debug.log*

# Dependencies
node_modules
yarn.lock

# Coverage
/coverage

# Build
/lib

# OS - OSX
.DS_Store

# OS - Windows
Thumbs.db
ehthumbs.db


================================================
FILE: .nvmrc
================================================
v6.11.2


================================================
FILE: .travis.yml
================================================
language: node_js
sudo: false

node_js:
  - "6"
  - "8"
  - "10"

before_install:
  - if [[ `npm -v` != 6* ]]; then npm i -g npm@6; fi

install:
  - npm install -g codecov
  - npm run bootstrap

script:
  - npm run style
  - npm run coverage

after_success:
  - codecov


================================================
FILE: CHANGELOG.md
================================================
# Changelog

See https://github.com/yvele/azure-function-express/releases


================================================
FILE: CONTRIBUTING.md
================================================
# Contributing

[Setup](#setup) |
[Commands](#command) |
[Unit Testing](#test) |
[Git Commit Guidelines](#commit)

## <a name="setup"></a> Setup

```sh
$ npm run bootstrap
```

## <a name="test"></a> Unit Testing

### Running tests

```sh
$ npm run test
```

with coverage:

```sh
$ npm run coverage
```

### Writing tests

Test can be asserted with [Should.js](https://shouldjs.github.io) :

```js
test().should.be.type("string");

test().should.eql({ foo: "foo", bar: "bar" });

test().should.be.equal("foobar");
```

```js
import should from "should";

should.throws(() => {
  throw new ArgumentError();
}, /ArgumentError/);
```

```js
it("Should fail", () => {
  return testAsync().should.be.rejectedWith("Error message");
});
```

```js
import should from "should";

should.equal(test(), null);

should("foobar" == "foobar").be.ok;
```

## <a name="command"></a> Commands

All commands should be run at the root path of the project.

| Command                      | Description       |
|------------------------------|-------------------|
| `$ npm run bootstrap`        | Setup the project for development
| `$ npm run build`            | Build (with babel)
| `$ npm run clean`            | Delete all temporary files (NPM, build, etc.)
| `$ npm run clean:build`      | Delete build files (babel, etc.)
| `$ npm run clean:npm`        | Delete NPM generated files (node_modules, logs, etc.)
| `$ npm run coverage`         | Run unit tests with code coverage
| `$ npm run style`            | Check code style
| `$ npm run test`             | Run tests
| `$ npm run validate`         | Check the code is valid by checking code style and running tests

## <a name="commit"></a> Git Commit Guidelines

Write meaningful and straightforward commit summaries.

```sh
# Bad
git commit assets -m 'change something' # ORLY? What change?

# Good
git commit assets -m 'style(css): Switch `reset.css` to `normalize.css`'
```

Avoid long commit summaries by limiting the maximum characters to `50`.

> Detailed descriptions should go on the commit message.

```sh
# Bad
git commit assets/javascripts -m 'Add `FIXME` note to dropdown module because it wasnt working on IE8'

# Good
git commit assets/javascripts -m 'style(dropdown): Add `FIXME` note to dropdown module'
```

Write commit summaries in the imperative, present tense.

```sh
# Bad
git commit scripts -m 'Fixed CI integration'

# Bad
git commit scripts -m 'Fixes CI integration'

# Bad
git commit scripts -m 'Fixing CI integration'

# Good
git commit scripts -m 'fix(ci): Fix CI integration'
```

Use proper english writing on commits.

> Because SCM is also code documentation.

```sh
# Bad (Everything in lower case, no proper punctuation and "whatever" really?)
git commit assets/stylesheets -m 'update clearfix or whatever'

# Bad (Why are you screaming?)
git commit assets/stylesheets -m 'UPDATE CLEARFIX'

# Good (Meaningful commit summary with proper orthography)
git commit assets/stylesheets -m 'fix(clearfix): Update clearfix implementation to use a more modern approach'
```

### Type

Must be one of the following:

| Prefix      | Description   |
|-------------|---------------|
| `feat`      | A new feature
| `fix`       | A bug fix
| `docs`      | Documentation only changes
| `style`     | Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
| `refactor ` | A code change that neither fixes a bug or adds a feature
| `test`      | Adding missing tests
| `chore`     | Changes to the build process or auxiliary tools and libraries such as documentation generation

### Scope
The scope could be anything specifying place of the commit change. For example `readme`,
`package.json`, `OptionManager`, `docs/Components`, etc...

### Subject
The subject contains succinct description of the change:

* Use the imperative, present tense: "change" not "changed" nor "changes"
* Capitalize first letter
* No dot (.) at the end

### Body
Just as in the **subject**, use the imperative, present tense: "change" not "changed" nor "changes".
The body should include the motivation for the change and contrast this with previous behavior.

### About

Those rules have been inspired by AngularJS [contributing page](https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md) and Netshoes [styleguide](https://github.com/netshoes/styleguide).


================================================
FILE: LICENSE
================================================

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================================================
FILE: README.md
================================================
# azure-function-express

<a href="https://azure.microsoft.com/en-us/services/functions/">
  <img align="right" alt="Function logo" src="docs/media/function.png" title="Function" width="150"/>
</a>

> Allows Express usage with Azure Function

[![npm version](https://img.shields.io/npm/v/azure-function-express.svg)](https://www.npmjs.com/package/azure-function-express)
[![Node](https://img.shields.io/badge/node-v6-blue.svg)](https://github.com/Azure/azure-webjobs-sdk-script/issues/2036#issuecomment-336942961)
![Node](https://img.shields.io/badge/node-v8-blue.svg)
![Node](https://img.shields.io/badge/node-v10-blue.svg)
[![Travis Status](https://img.shields.io/travis/yvele/azure-function-express/master.svg?label=travis)](https://travis-ci.org/yvele/azure-function-express)
[![Coverage Status](https://img.shields.io/codecov/c/github/yvele/azure-function-express/master.svg)](https://codecov.io/github/yvele/azure-function-express)
[![MIT licensed](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)


## Description

[Connect](https://github.com/senchalabs/connect) your [Express](https://expressjs.com) application to an [Azure Function handler](https://docs.microsoft.com/en-us/azure/azure-functions/functions-reference-node), and make seamless usage of [all middlewares](http://expressjs.com/en/guide/using-middleware.html) you are already familiar with.


## Usage

In your `index.js`:

```js
const createHandler = require("azure-function-express").createHandler;
const express = require("express");

// Create express app as usual
const app = express();
app.get("/api/:foo/:bar", (req, res) => {
  res.json({
    foo  : req.params.foo,
    bar  : req.params.bar
  });
});

// Binds the express app to an Azure Function handler
module.exports = createHandler(app);
```

Make sure you are binding `req` and `res` in your `function.json`:

```json
{
  "bindings": [{
    "authLevel" : "anonymous",
    "type"      : "httpTrigger",
    "direction" : "in",
    "name"      : "req",
    "route"     : "foo/{bar}/{id}"
  }, {
    "type"      : "http",
    "direction" : "out",
    "name"      : "res"
  }]
}
```

To allow Express handles all HTTP routes itself you may set a glob star route in a single root `function.json`:

```json
{
  "bindings": [{
    "authLevel" : "anonymous",
    "type"      : "httpTrigger",
    "direction" : "in",
    "name"      : "req",
    "route"     : "{*segments}"
  }, {
    "type"      : "http",
    "direction" : "out",
    "name"      : "res"
  }]
}
```

Note that `segments` is not used and could be anything. See [Azure Function documentation](https://github.com/Azure/azure-webjobs-sdk-script/wiki/Http-Functions).

All examples [here](/examples/).


## Context

All native Azure Functions [context](https://docs.microsoft.com/en-us/azure/azure-functions/functions-reference-node#context-object) properties, except `done`, are exposed through `req.context`.

As en example, you can [log](https://docs.microsoft.com/en-us/azure/azure-functions/functions-reference-node#writing-trace-output-to-the-console) using:

```js
app.get("/api/hello-world", (req, res) => {
  req.context.log({ hello: "world" });
  ...
});
```


## Runtime compatibility

Supported Node version are:
 - Node 6.11.2 ([first node version supported by Azure Functions](https://github.com/Azure/azure-webjobs-sdk-script/issues/2036#issuecomment-336942961))
 - Node 8 (LTS)
 - Node 10

Azure Functions runtime v1 and v2 beta are both supported.


## License

[Apache 2.0](LICENSE) © Yves Merlicco


================================================
FILE: docs/azure-function.md
================================================
# Azure Function

## Documentation

- Documentation
  - [Node Documentation](https://azure.microsoft.com/en-us/documentation/articles/functions-reference-node/)
  - [WebJobs SDK Wiki](https://github.com/Azure/azure-webjobs-sdk-script/wiki)
- Changelog
  - [Azure WebJobs SDK Releases](https://github.com/Azure/azure-webjobs-sdk-script/releases)
  - [Azure WebJobs SDK Changelog](https://github.com/Azure/azure-webjobs-sdk/wiki/Release-Notes) (outdated!)
- [Data binding](https://azure.microsoft.com/en-us/documentation/articles/functions-bindings-http-webhook/)

## Response example

```js
context.res = { status: 202, body: "You successfully ordered more coffee!" };
```

## Context example

```js
context = {
  invocationId  : 'f0f6e586-0b79-4407-aa53-97919f45eba6',
  log           : [Function],
  bindings: {
    req: {
      originalUrl: 'https://my-deployment-id.azurewebsites.net/api/get',
      method: 'POST',
      query: {},
      headers: {
        "connection"            : "Keep-Alive",
        "authorization"         : "Bearer eyJhbGciOiJIUzI1NiIsIn...",
        "host"                  : "my-deployment-id.azurewebsites.net",
        "max-forwards"          : "10",
        "x-liveupgrade"         : "1",
        "x-arr-log-id"          : "fe0ba896-00d0-4ce7-a790-c8978fcaa1fd",
        "disguised-host"        : "my-deployment-id.azurewebsites.net",
        "x-site-deployment-id"  : "my-deployment-id",
        "was-default-hostname"  : "my-deployment-id.azurewebsites.net",
        "x-original-url"        : "/api/get",
        "x-forwarded-for"       : "92.103.167.115:57996",
        "x-arr-ssl"             : "2048|256|C=US, S=Washington, L=Redmond, O=Microsoft Corporation, OU=Microsoft IT, CN=Microsoft IT SSL SHA2|CN=*.azurewebsites.net",
      },

      // form-data
      body: "------WebKitFormBoundaryUPAtNZMGi7yHMoIX\r\nContent-Disposition: form-data; name=\"a\"\r\n\r\nb\r\n------WebKitFormBoundaryUPAtNZMGi7yHMoIX\r\nContent-Disposition: form-data; name=\"aa\"\r\n\r\nbb\r\n------WebKitFormBoundaryUPAtNZMGi7yHMoIX--\r\n",
      rawBody: "------WebKitFormBoundaryUPAtNZMGi7yHMoIX\r\nContent-Disposition: form-data; name=\"a\"\r\n\r\nb\r\n------WebKitFormBoundaryUPAtNZMGi7yHMoIX\r\nContent-Disposition: form-data; name=\"aa\"\r\n\r\nbb\r\n------WebKitFormBoundaryUPAtNZMGi7yHMoIX--\r\n",

      // x-www-form-urlencoded
      body: "foo=bar&fou=barre",
      rawBody: "foo=bar&fou=barre",

      // raw --> application/json
      "body": {
        "foo": "bar",
        "fou": "barre"
      },
      "rawBody": "{\n    \"foo\": \"bar\",\n    \"fou\": \"barre\"\n    \n}",
    }
  },
  bind: [Function],
  bindingData: {
    req: 'Method: POST, RequestUri: \'https://my-deployment-id.azurewebsites.net/api/get\', Version: 1.1, Content: System.Web.Http.WebHost.HttpControllerHandler+LazyStreamContent, Headers:\r\n{\r\n  Connection: Keep-Alive\r\n  Accept: application/json\r\n  Accept: */*\r\n  Accept-Encoding: gzip\r\n  Accept-Encoding: deflate\r\n  Accept-Encoding: br\r\n  Accept-Language: fr\r\n  Accept-Language: en-US; q=0.8\r\n  Accept-Language: en; q=0.6\r\n  Host: my-deployment-id.azurewebsites.net\r\n  Max-Forwards: 10\r\n  Referer: https://functions.azure.com/?trustedAuthority=https://portal.azure.com/\r\n  User-Agent: Mozilla/5.0\r\n  User-Agent: (Macintosh; Intel Mac OS X 10_11_6)\r\n  User-Agent: AppleWebKit/537.36\r\n  User-Agent: (KHTML, like Gecko)\r\n  User-Agent: Chrome/52.0.2743.116\r\n  User-Agent: Safari/537.36\r\n  x-functions-key: G/6oEOahmJgI5Y1jfstIEpd1ygWwvERuylzEOnvUTUapJUsCYoEAyQ==\r\n  Origin: https://functions.azure.com\r\n  X-LiveUpgrade: 1\r\n  X-ARR-LOG-ID: 865e04b5-923e-496a-a759-b0b36ab5b99b\r\n  DISGUISED-HOST: my-deployment-id.azurewebsites.net\r\n  X-SITE-DEPLOYMENT-ID: my-deployment-id\r\n  WAS-DEFAULT-HOSTNAME: my-deployment-id.azurewebsites.net\r\n  X-Original-URL: /api/get\r\n  X-Forwarded-For: 92.103.167.115:58342\r\n  X-ARR-SSL: 2048|256|C=US, S=Washington, L=Redmond, O=Microsoft Corporation, OU=Microsoft IT, CN=Microsoft IT SSL SHA2|CN=*.azurewebsites.net\r\n  Content-Length: 0\r\n  Content-Type: plain/text\r\n}',
    InvocationId: 'f0f6e586-0b79-4407-aa53-97919f45eba6'
  },
  done  : [Function],
  res   : {}
}
```


================================================
FILE: examples/all-routes/function.json
================================================
{
  "disabled" : false,
  "bindings" : [{
    "authLevel" : "anonymous",
    "type"      : "httpTrigger",
    "direction" : "in",
    "name"      : "req",
    "route"     : "{*segments}"
  }, {
    "type"      : "http",
    "direction" : "out",
    "name"      : "res"
  }]
}


================================================
FILE: examples/all-routes/index.js
================================================
const createAzureFunctionHandler = require("azure-function-express").createAzureFunctionHandler;
const express = require("express");

// Create express app as usual
const app = express();
app.get("/api/:foo", (req, res) => res.json({ foo: req.params.foo }));
app.get("/api/:foo/:bar", (req, res) => res.json({ foo: req.params.foo, bar: req.params.bar }));

// Binds the express app to an Azure Function handler
module.exports = createAzureFunctionHandler(app);


================================================
FILE: examples/basic/function.json
================================================
{
  "bindings": [{
    "authLevel" : "anonymous",
    "type"      : "httpTrigger",
    "direction" : "in",
    "name"      : "req",
    "route"     : "foo/{bar}/{id}"
  }, {
    "type"      : "http",
    "direction" : "out",
    "name"      : "res"
  }]
}


================================================
FILE: examples/basic/index.js
================================================
const createAzureFunctionHandler = require("azure-function-express").createAzureFunctionHandler;
const express = require("express");

// Create express app as usual
const app = express();
app.get("/api/:foo/:bar", (req, res) => {
  res.json({
    foo  : req.params.foo,
    bar  : req.params.bar
  });
});

// Binds the express app to an Azure Function handler
module.exports = createAzureFunctionHandler(app);


================================================
FILE: examples/basic-module/function.json
================================================
{
  "bindings": [{
    "authLevel" : "anonymous",
    "type"      : "httpTrigger",
    "direction" : "in",
    "name"      : "req",
    "route"     : "foo/{bar}/{id}"
  }, {
    "type"      : "http",
    "direction" : "out",
    "name"      : "res"
  }]
}


================================================
FILE: examples/basic-module/index.js
================================================
import { createAzureFunctionHandler } from "azure-function-express";
import express from "express";

// Create express app as usual
const app = express();
app.get("/api/:foo/:bar", (req, res) => {
  res.json({
    foo  : req.params.foo,
    bar  : req.params.bar
  });
});

// Binds the express app to an Azure Function handler
export default createAzureFunctionHandler(app);


================================================
FILE: package.json
================================================
{
  "name": "azure-function-express",
  "version": "2.0.0",
  "sideEffects": false,
  "description": "Allows Express usage with Azure Function",
  "keywords": [
    "azure function",
    "express",
    "connect",
    "azure",
    "koa"
  ],
  "homepage": "https://github.com/yvele/azure-function-express",
  "bugs": {
    "url": "https://github.com/yvele/azure-function-express/issues"
  },
  "license": "Apache-2.0",
  "repository": {
    "type": "git",
    "url": "https://github.com/yvele/azure-function-express"
  },
  "files": [
    "lib/"
  ],
  "main": "lib/index.js",
  "author": {
    "name": "Merlicco Yves",
    "email": "merlicco@gmail.com"
  },
  "contributors": [
    "Yves Merlicco <merlicco@gmail.com>"
  ],
  "scripts": {
    "bootstrap": "npm install",
    "build": "rm -rf lib && babel src --out-dir lib",
    "clean": "rm -rf lib coverage node_modules",
    "clean:build": "rm -rf lib",
    "clean:npm": "rm -rf node_modules",
    "coverage": "jest --coverage",
    "publish": "npm run validate && npm run build && npm publish",
    "style": "eslint src/**",
    "test": "jest",
    "validate": "npm run style && npm run coverage"
  },
  "engines": {
    "node": ">=6.11.2 <11",
    "npm": ">=6"
  },
  "devDependencies": {
    "@babel/cli": "^7.0.0",
    "@babel/core": "^7.0.0",
    "@babel/plugin-proposal-export-default-from": "^7.0.0",
    "@babel/plugin-proposal-export-namespace-from": "^7.0.0",
    "@babel/plugin-proposal-object-rest-spread": "^7.0.0",
    "@babel/preset-env": "^7.0.0",
    "@babel/register": "^7.0.0",
    "babel-core": "^7.0.0-bridge.0",
    "babel-eslint": "^9.0.0",
    "babel-plugin-add-module-exports": "^0.2.1",
    "eslint": "^5.5.0",
    "eslint-config-airbnb-base": "^13.1.0",
    "eslint-plugin-import": "^2.14.0",
    "express": "^4.16.3",
    "jest": "^23.5.0"
  }
}


================================================
FILE: src/ExpressAdapter.js
================================================
import EventEmitter from "events";
import OutgoingMessage from "./OutgoingMessage";
import IncomingMessage from "./IncomingMessage";

/**
 * @param {Object} context Azure Function native context object
 * @throws {Error}
 * @private
 */
function assertContext(context) {
  if (!context) {
    throw new Error("context is null or undefined");
  }

  if (!context.bindings) {
    throw new Error("context.bindings is null or undefined");
  }

  if (!context.bindings.req) {
    throw new Error("context.bindings.req is null or undefined");
  }

  if (!context.bindings.req.originalUrl) {
    throw new Error("context.bindings.req.originalUrl is null or undefined");
  }
}

/**
 * Express adapter allowing to handle Azure Function requests by wrapping in request events.
 *
 * @class
 * @fires request
 */
export default class ExpressAdapter extends EventEmitter {

  /**
   * @param {Object=} requestListener Request listener (typically an express/connect instance)
   */
  constructor(requestListener) {
    super();

    if (requestListener !== undefined) {
      this.addRequestListener(requestListener);
    }
  }

  /**
   * Adds a request listener (typically an express/connect instance).
   *
   * @param {Object} requestListener Request listener (typically an express/connect instance)
   */
  addRequestListener(requestListener) {
    this.addListener("request", requestListener);
  }

  /**
   * Handles Azure Function requests.
   *
   * @param {Object} context Azure context object for a single request
   */
  handleAzureFunctionRequest(context) {
    assertContext(context);

    // 1. Context basic initialization
    context.res = context.res || {};

    // 2. Wrapping
    const req = new IncomingMessage(context);
    const res = new OutgoingMessage(context);

    // 3. Synchronously calls each of the listeners registered for the event
    this.emit("request", req, res);
  }

  /**
   * Create function ready to be exposed to Azure Function for request handling.
   *
   * @returns {function(context: Object)} Azure Function handle
   */
  createAzureFunctionHandler() {
    return this.handleAzureFunctionRequest.bind(this);
  }

}


================================================
FILE: src/IncomingMessage.js
================================================
/* eslint-disable no-underscore-dangle */
import EventEmitter from "events";

const NOOP = () => {};

function removePortFromAddress(address) {
  return address
    ? address.replace(/:[0-9]*$/, "")
    : address;
}

/**
 * Create a fake connection object
 *
 * @param {Object} context Raw Azure context object for a single HTTP request
 * @returns {object} Connection object
 */
function createConnectionObject(context) {
  const { req } = context.bindings;
  const xForwardedFor = req.headers ? req.headers["x-forwarded-for"] : undefined;

  return {
    encrypted     : req.originalUrl && req.originalUrl.toLowerCase().startsWith("https"),
    remoteAddress : removePortFromAddress(xForwardedFor)
  };
}

/**
 * Copy usefull context properties from the native context provided by the Azure Function engine
 *
 * See:
 * - https://docs.microsoft.com/en-us/azure/azure-functions/functions-reference-node#context-object
 * - https://github.com/christopheranderson/azure-functions-typescript/blob/master/src/context.d.ts
 *
 * @param {Object} context Raw Azure context object for a single HTTP request
 * @returns {Object} Filtered context
 */
function sanitizeContext(context) {
  const sanitizedContext = {
    ...context,
    log : context.log.bind(context)
  };

  // We don't want the developper to mess up express flow
  // See https://github.com/yvele/azure-function-express/pull/12#issuecomment-336733540
  delete sanitizedContext.done;

  return sanitizedContext;
}

/**
 * Request object wrapper
 *
 * @private
 */
export default class IncomingMessage extends EventEmitter {

  /**
   * Note: IncomingMessage assumes that all HTTP in is binded to "req" property
   *
   * @param {Object} context Sanitized Azure context object for a single HTTP request
   */
  constructor(context) {
    super();

    Object.assign(this, context.bindings.req); // Inherit

    this.url = this.originalUrl;
    this.headers = this.headers || {}; // Should always have a headers object

    this._readableState = { pipesCount: 0 }; // To make unpipe happy
    this.resume = NOOP;
    this.socket = { destroy: NOOP };
    this.connection = createConnectionObject(context);

    this.context = sanitizeContext(context); // Specific to Azure Function
  }

}


================================================
FILE: src/OutgoingMessage.js
================================================
/* eslint-disable no-magic-numbers, no-underscore-dangle */
import { OutgoingMessage as NativeOutgoingMessage } from "http";
import statusCodes from "./statusCodes";

/**
 * @param {Object|string|Buffer} body Express/connect body object
 * @param {string} encoding
 * @returns {Object|string} Azure Function body
 */
function convertToBody(body, encoding) {
  // This may be removed on Azure Function native support for Buffer
  // https://github.com/Azure/azure-webjobs-sdk-script/issues/814
  // https://github.com/Azure/azure-webjobs-sdk-script/pull/781
  return Buffer.isBuffer(body)
    ? body.toString(encoding)
    : body;
}

/**
 * @param {Object} context Azure Function context
 * @param {string|Buffer} data
 * @param {string} encoding
 * @this {OutgoingMessage}
 */
function end(context, data, encoding) {
  // 1. Write head
  this.writeHead(this.statusCode); // Make jshttp/on-headers able to trigger

  // 2. Return raw body to Azure Function runtime
  context.res.body = convertToBody(data, encoding);
  context.res.isRaw = true;
  context.done();
}

/**
 * https://nodejs.org/api/http.html#http_response_writehead_statuscode_statusmessage_headers
 * Original implementation: https://github.com/nodejs/node/blob/v6.x/lib/_http_server.js#L160
 *
 * @param {Object} context Azure Function context
 * @param {number} statusCode
 * @param {string} statusMessage
 * @param {Object} headers
 * @this {OutgoingMessage}
 */
function writeHead(context, statusCode, statusMessage, headers) {
  // 1. Status code
  statusCode |= 0; // eslint-disable-line no-param-reassign
  if (statusCode < 100 || statusCode > 999) {
    throw new RangeError(`Invalid status code: ${statusCode}`);
  }

  // 2. Status message
  if (typeof statusMessage === "string") {
    this.statusMessage = statusMessage;
  } else {
    this.statusMessage = statusCodes[statusCode] || "unknown";
  }

  // 3. Headers
  if (typeof statusMessage === "object" && typeof headers === "undefined") {
    headers = statusMessage; // eslint-disable-line no-param-reassign
  }
  if (this._headers) {
    // Slow-case: when progressive API and header fields are passed.
    if (headers) {
      const keys = Object.keys(headers);
      for (let i = 0; i < keys.length; i++) {
        const k = keys[i];
        if (k) {
          this.setHeader(k, headers[k]);
        }
      }
    }
    // only progressive api is used
    headers = this._renderHeaders(); // eslint-disable-line no-param-reassign
  }

  // 4. Sets everything
  context.res.status = statusCode;
  // In order to uniformize node 6 behaviour with node 8 and 10,
  // we want to never have undefined headers, but instead empty object
  context.res.headers = headers || {};
}

/**
 * OutgoingMessage mock based on https://github.com/nodejs/node/blob/v6.x
 *
 * Note: This implementation is only meant to be working with Node.js v6.x
 *
 * @private
 */
export default class OutgoingMessage extends NativeOutgoingMessage {

  /**
   * Original implementation: https://github.com/nodejs/node/blob/v6.x/lib/_http_outgoing.js#L48
   */
  constructor(context) {
    super();
    this._headers = null;
    this._headerNames = {};
    this._removedHeader = {};
    this._hasBody = true;

    // Those methods cannot be prototyped because express explicitelly overrides __proto__
    // See https://github.com/expressjs/express/blob/master/lib/middleware/init.js#L29
    this.writeHead = writeHead.bind(this, context);
    this.end = end.bind(this, context);
  }

}


================================================
FILE: src/createAzureFunctionHandler.js
================================================
import ExpressAdapter from "./ExpressAdapter";

/**
 * Creates a function ready to be exposed to Azure Function for request handling.
 *
 * @param {Object} requestListener Request listener (typically an express/connect instance)
 * @returns {function(context: Object)} Azure Function handle
 */
export default function createAzureFunctionHandler(requestListener) {
  const adapter = new ExpressAdapter(requestListener);
  return adapter.createAzureFunctionHandler();
}


================================================
FILE: src/index.js
================================================
import createAzureFunctionHandler from "./createAzureFunctionHandler";

export ExpressAdapter from "./ExpressAdapter";
export { createAzureFunctionHandler, createAzureFunctionHandler as createHandler };


================================================
FILE: src/statusCodes.js
================================================
export default {
  100 : "Continue",
  101 : "Switching Protocols",
  102 : "Processing",                 // RFC 2518, obsoleted by RFC 4918
  200 : "OK",
  201 : "Created",
  202 : "Accepted",
  203 : "Non-Authoritative Information",
  204 : "No Content",
  205 : "Reset Content",
  206 : "Partial Content",
  207 : "Multi-Status",               // RFC 4918
  208 : "Already Reported",
  226 : "IM Used",
  300 : "Multiple Choices",
  301 : "Moved Permanently",
  302 : "Found",
  303 : "See Other",
  304 : "Not Modified",
  305 : "Use Proxy",
  307 : "Temporary Redirect",
  308 : "Permanent Redirect",         // RFC 7238
  400 : "Bad Request",
  401 : "Unauthorized",
  402 : "Payment Required",
  403 : "Forbidden",
  404 : "Not Found",
  405 : "Method Not Allowed",
  406 : "Not Acceptable",
  407 : "Proxy Authentication Required",
  408 : "Request Timeout",
  409 : "Conflict",
  410 : "Gone",
  411 : "Length Required",
  412 : "Precondition Failed",
  413 : "Payload Too Large",
  414 : "URI Too Long",
  415 : "Unsupported Media Type",
  416 : "Range Not Satisfiable",
  417 : "Expectation Failed",
  418 : "I\"m a teapot",              // RFC 2324
  421 : "Misdirected Request",
  422 : "Unprocessable Entity",       // RFC 4918
  423 : "Locked",                     // RFC 4918
  424 : "Failed Dependency",          // RFC 4918
  425 : "Unordered Collection",       // RFC 4918
  426 : "Upgrade Required",           // RFC 2817
  428 : "Precondition Required",      // RFC 6585
  429 : "Too Many Requests",          // RFC 6585
  431 : "Request Header Fields Too Large", // RFC 6585
  451 : "Unavailable For Legal Reasons",
  500 : "Internal Server Error",
  501 : "Not Implemented",
  502 : "Bad Gateway",
  503 : "Service Unavailable",
  504 : "Gateway Timeout",
  505 : "HTTP Version Not Supported",
  506 : "Variant Also Negotiates",    // RFC 2295
  507 : "Insufficient Storage",       // RFC 4918
  508 : "Loop Detected",
  509 : "Bandwidth Limit Exceeded",
  510 : "Not Extended",               // RFC 2774
  511 : "Network Authentication Required" // RFC 6585
};


================================================
FILE: test/ExpressAdapter.test.js
================================================
import { ExpressAdapter } from "../src";

const NOOP = () => {};

describe("ExpressAdapter", () => {

  it("Should work", done => {

    let listenerCalled = false;

    const adapter = new ExpressAdapter((req, res) => {
      listenerCalled = true;
      expect(req.url).toBe("http://foo.com/bar");
      res.statusCode = 200;
      res.end("body", "utf8");
    });

    const context = {
      log       : NOOP,
      bindings  : { req: { originalUrl: "http://foo.com/bar" } },
      done      : () => {
        expect(listenerCalled).toBe(true);

        // Response that will be sent to Azure Function runtime
        expect(context.res).toEqual({
          body    : "body",
          headers : {},
          isRaw   : true,
          status  : 200
        });
        done();
      }
    };

    const handler = adapter.createAzureFunctionHandler();
    handler(context);
  });

  it("Should work with a buffer", done => {

    let listenerCalled = false;

    const adapter = new ExpressAdapter((req, res) => {
      listenerCalled = true;
      expect(req.url).toBe("http://foo.com/bar");
      res.statusCode = 200;
      res.end(Buffer.from("body", "utf8"), "utf8");
    });

    const context = {
      log       : NOOP,
      bindings  : { req: { originalUrl: "http://foo.com/bar" } },
      done      : () => {
        expect(listenerCalled).toBe(true);

        // Response that will be sent to Azure Function runtime
        expect(context.res).toEqual({
          body    : "body",
          headers : {},
          isRaw   : true,
          status  : 200
        });
        done();
      }
    };

    const handler = adapter.createAzureFunctionHandler();
    handler(context);
  });

  describe("handleAzureFunctionRequest", () => {

    it("Should throws with no context", () => {
      const adapter = new ExpressAdapter();
      expect(() => {
        adapter.handleAzureFunctionRequest();
      }).toThrowError(/^context is null or undefined/);
    });

    it("Should throws with a context with no bindings", () => {
      const adapter = new ExpressAdapter();
      expect(() => {
        adapter.handleAzureFunctionRequest({});
      }).toThrowError(/^context.bindings is null or undefined/);
    });

    it("Should throws with a context with no req binding", () => {
      const adapter = new ExpressAdapter();
      expect(() => {
        adapter.handleAzureFunctionRequest({ bindings: {} });
      }).toThrowError(/^context.bindings.req is null or undefined/);
    });

    it("Should throws with a context with a req binding having no originalUrl", () => {
      const adapter = new ExpressAdapter();
      expect(() => {
        adapter.handleAzureFunctionRequest({ bindings: { req: {} } });
      }).toThrowError(/^context.bindings.req.originalUrl is null or undefined/);
    });

  });

});


================================================
FILE: test/IncomingMessage.test.js
================================================
import IncomingMessage from "../src/IncomingMessage";

describe("IncomingMessage", () => {

  it("Should work", () => {

    const context = {
      bindings : {
        req : {
          originalUrl : "https://foo.com/bar",
          headers     : { "x-forwarded-for": "192.168.0.1:57996" }
        }
      },
      log : () => {}
    };

    const req = new IncomingMessage(context);
    req.resume();
    req.socket.destroy();

    expect(req).toMatchObject({
      url         : "https://foo.com/bar",
      connection  : {
        encrypted     : true,
        remoteAddress : "192.168.0.1"
      }
    });
  });

  it("Should work with no headers", () => {

    const context = {
      bindings : {
        req : {
          originalUrl : "http://foo.com/bar"
        }
      },
      log : () => {}
    };

    const req = new IncomingMessage(context);
    req.resume();
    req.socket.destroy();

    expect(req).toMatchObject({
      url         : "http://foo.com/bar",
      connection  : {
        encrypted     : false,
        remoteAddress : undefined
      }
    });
  });

  it("Should work with a full native context object", () => {

    const context = {
      invocationId : "f0f6e586-0b79-4407-aa53-97919f45eba5",
      bindingData : { foo: "bar" },
      bindings : {
        req : {
          originalUrl : "http://foo.com/bar"
        }
      },
      log   : () => {},
      done  : () => {}
    };

    const req = new IncomingMessage(context);
    req.resume();
    req.socket.destroy();

    expect(req).toMatchObject({
      url         : "http://foo.com/bar",
      connection  : {
        encrypted     : false,
        remoteAddress : undefined
      }
    });

    expect(req.context).toBeDefined();
    expect(req.context).not.toBe(context);
    expect(req.context.invocationId).toBe(context.invocationId);
    expect(req.context.bindingData).toBe(context.bindingData);
    expect(req.context.bindings).toBe(context.bindings);
    expect(req.context.log).not.toBe(context.log);
    expect(req.context.log).toBeInstanceOf(Function);
    expect(req.context.done).toBeUndefined(); // We don't want to pass done

  });

});


================================================
FILE: test/OutgoingMessage.test.js
================================================
import OutgoingMessage from "../src/OutgoingMessage";

describe("OutgoingMessage", () => {

  describe("writeHead", () => {

    it("Should throws with an invalid status code", () => {
      const res = new OutgoingMessage();
      expect(() => {
        res.writeHead(1);
      }).toThrow(/^Invalid status code: 1/);
    });

    it("Should handle unknown status codes", () => {
      const context = { res: {} };
      const res = new OutgoingMessage(context);

      res.writeHead(998);

      expect(res.statusMessage).toBe("unknown");
      expect(context.res.status).toBe(998);
    });

    it("Should work with headers", () => {
      const context = { res: {} };
      const res = new OutgoingMessage(context);

      res.writeHead(200, null, { foo: "bar" });

      expect(res.statusMessage).toBe("OK");
      expect(context.res.status).toBe(200);
      expect(context.res.headers).toEqual({ foo: "bar" });
    });

    it("Should work with headers with previous headers", () => {
      const context = { res: {} };
      const res = new OutgoingMessage(context);
      res._headers = { previous: "previous" };
      res._renderHeaders = () => res._headers;

      res.writeHead(200, null, { foo: "bar" });

      expect(res.statusMessage).toBe("OK");
      expect(context.res.status).toBe(200);
      expect(context.res.headers).toEqual({ foo: "bar", previous: "previous" });
    });

    it("Should work with a status message", () => {
      const context = { res: {} };
      const res = new OutgoingMessage(context);

      res.writeHead(200, "baz", { foo: "bar" });

      expect(res.statusMessage).toBe("baz");
      expect(context.res.status).toBe(200);
      expect(context.res.headers).toEqual({ foo: "bar" });
    });

    it("Should work with a headers as second parameter if no status message is given", () => {
      const context = { res: {} };
      const res = new OutgoingMessage(context);

      res.writeHead(200, { foo: "bar" });

      expect(res.statusMessage).toBe("OK");
      expect(context.res.status).toBe(200);
      expect(context.res.headers).toEqual({ foo: "bar" });
    });

  });

});


================================================
FILE: test/expressIntegration.test.js
================================================
import express from "express";
import { createAzureFunctionHandler } from "../src";

describe("express integration", () => {

  it("should work with x-powered-by", done => {

    // 1. Create express app
    const app = express();

    app.get("/api/:foo/:bar", (req, res) => {
      res.set("Cache-Control", "max-age=600");
      res.json({ foo: req.params.foo, bar: req.params.bar });
    });

    // 2. Create handle
    const handle = createAzureFunctionHandler(app);

    // 3. Mock Azure Function context
    var context = {
      bindings  : { req: { method: "GET", originalUrl: "https://lol.com/api/foo/bar" } },
      log       : () => { throw new Error("Log should not be called"); },
      done : (error) => {
        expect(error).toBeUndefined();
        expect(context.res.status).toBe(200);
        expect(context.res.body).toBe('{"foo":"foo","bar":"bar"}');
        expect(context.res.headers).toEqual({
          "X-Powered-By"    : "Express",
          "Cache-Control"   : "max-age=600",
          "Content-Type"    : "application/json; charset=utf-8",
          "Content-Length"  : "25",
          ETag              : 'W/"19-0CKEGOfZ5AYCM4LPaa4gzWL6olU"'
        });

        done();
      }
    };

    // 4. Call the handle with the mockup
    handle(context, context.req);
  });

  it("should work without x-powered-by", done => {

    // 1. Create express app
    const app = express();
    app.disable("x-powered-by");

    app.get("/api/:foo/:bar", (req, res) => {
      res.json({ foo: req.params.foo, bar: req.params.bar });
    });

    // 2. Create handle
    const handle = createAzureFunctionHandler(app);

    // 3. Mock Azure Function context
    var context = {
      bindings  : { req: { method: "GET", originalUrl: "https://lol.com/api/foo/bar" } },
      log       : () => { throw new Error("Log should not be called"); },
      done : (error) => {
        expect(error).toBeUndefined();
        expect(context.res.status).toBe(200);
        expect(context.res.body).toBe('{"foo":"foo","bar":"bar"}');
        expect(context.res.headers).toEqual({
          "Content-Type"    : "application/json; charset=utf-8",
          "Content-Length"  : "25",
          ETag              : 'W/"19-0CKEGOfZ5AYCM4LPaa4gzWL6olU"'
        });

        done();
      }
    };

    // 4. Call the handle with the mockup
    handle(context, context.req);
  });

});


================================================
FILE: test/main.test.js
================================================
import { createAzureFunctionHandler, createHandler } from "../src";

const NOOP = () => {};

describe("main", () => {

  it("createAzureFunctionHandler should work", () => {
    expect(createAzureFunctionHandler(NOOP)).toBeInstanceOf(Function);
  });

  it("createHandler should work", () => {
    expect(createHandler(NOOP)).toBeInstanceOf(Function);
  });

});