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[EDIT] FILE: proxy-from-env.zip

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S[&T�������	��README.mdnu�ȯ����������# proxy-from-env

[![Build Status](https://travis-ci.org/Rob--W/proxy-from-env.svg?branch=master)](https://travis-ci.org/Rob--W/proxy-from-env)
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`proxy-from-env` is a Node.js package that exports a function (`getProxyForUrl`)
that takes an input URL (a string or
[`url.parse`](https://nodejs.org/docs/latest/api/url.html#url_url_parsing)'s
return value) and returns the desired proxy URL (also a string) based on
standard proxy environment variables. If no proxy is set, an empty string is
returned.

It is your responsibility to actually proxy the request using the given URL.

Installation:

```sh
npm install proxy-from-env
```

## Example
This example shows how the data for a URL can be fetched via the
[`http` module](https://nodejs.org/api/http.html), in a proxy-aware way.

```javascript
var http = require('http');
var parseUrl = require('url').parse;
var getProxyForUrl = require('proxy-from-env').getProxyForUrl;

var some_url = 'http://example.com/something';

// // Example, if there is a proxy server at 10.0.0.1:1234, then setting the
// // http_proxy environment variable causes the request to go through a proxy.
// process.env.http_proxy = 'http://10.0.0.1:1234';
// 
// // But if the host to be proxied is listed in NO_PROXY, then the request is
// // not proxied (but a direct request is made).
// process.env.no_proxy = 'example.com';

```

## Environment variables
The environment variables can be specified in lowercase or uppercase, with the
lowercase name having precedence over the uppercase variant. A variable that is
not set has the same meaning as a variable that is set but has no value.

### NO\_PROXY

`NO_PROXY` is a list of host names (optionally with a port). If the input URL
matches any of the entries in `NO_PROXY`, then the input URL should be fetched
by a direct request (i.e. without a proxy).

Matching follows the following rules:

- `NO_PROXY=*` disables all proxies.
- Space and commas may be used to separate the entries in the `NO_PROXY` list.
- If `NO_PROXY` does not contain any entries, then proxies are never disabled.
- If a port is added after the host name, then the ports must match. If the URL
  does not have an explicit port name, the protocol's default port is used.
- Generally, the proxy is only disabled if the host name is an exact match for
  an entry in the `NO_PROXY` list. The only exceptions are entries that start
  with a dot or with a wildcard; then the proxy is disabled if the host name
  ends with the entry.

See `test.js` for examples of what should match and what does not.

### \*\_PROXY

The environment variable used for the proxy depends on the protocol of the URL.
For example, `https://example.com` uses the "https" protocol, and therefore the
proxy to be used is `HTTPS_PROXY` (_NOT_ `HTTP_PROXY`, which is _only_ used for
http:-URLs).

The library is not limited to http(s), other schemes such as
`FTP_PROXY` (ftp:),
`WSS_PROXY` (wss:),
`WS_PROXY` (ws:)
are also supported.

If present, `ALL_PROXY` is used as fallback if there is no other match.

## External resources
The exact way of parsing the environment variables is not codified in any
standard. This library is designed to be compatible with formats as expected by
existing software.
The following resources were used to determine the desired behavior:

- cURL:
  https://curl.haxx.se/docs/manpage.html#ENVIRONMENT  
  https://github.com/curl/curl/blob/4af40b3646d3b09f68e419f7ca866ff395d1f897/lib/url.c#L4446-L4514  
  https://github.com/curl/curl/blob/4af40b3646d3b09f68e419f7ca866ff395d1f897/lib/url.c#L4608-L4638

- wget: 
  https://www.gnu.org/software/wget/manual/wget.html#Proxies  
  http://git.savannah.gnu.org/cgit/wget.git/tree/src/init.c?id=636a5f9a1c508aa39e35a3a8e9e54520a284d93d#n383  
  http://git.savannah.gnu.org/cgit/wget.git/tree/src/retr.c?id=93c1517c4071c4288ba5a4b038e7634e4c6b5482#n1278

- W3:
  https://www.w3.org/Daemon/User/Proxies/ProxyClients.html

- Python's urllib:
  https://github.com/python/cpython/blob/936135bb97fe04223aa30ca6e98eac8f3ed6b349/Lib/urllib/request.py#L755-L782  
  https://github.com/python/cpython/blob/936135bb97fe04223aa30ca6e98eac8f3ed6b349/Lib/urllib/request.py#L2444-L2479
PK�����
S[~b0?��?����LICENSEnu�ȯ����������The MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
PK�����
S[~'���������package.jsonnu�ȯ����������{
  "name": "proxy-from-env",
  "version": "1.1.0",
  "description": "Offers getProxyForUrl to get the proxy URL for a URL, respecting the *_PROXY (e.g. HTTP_PROXY) and NO_PROXY environment variables.",
  "main": "index.js",
  "scripts": {
    "lint": "eslint *.js",
    "test": "mocha ./test.js --reporter spec",
    "test-coverage": "istanbul cover ./node_modules/.bin/_mocha -- --reporter spec"
  },
  "repository": {
    "type": "git",
    "url": "https://github.com/Rob--W/proxy-from-env.git"
  },
  "keywords": [
    "proxy",
    "http_proxy",
    "https_proxy",
    "no_proxy",
    "environment"
  ],
  "author": "Rob Wu <rob@robwu.nl> (https://robwu.nl/)",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/Rob--W/proxy-from-env/issues"
  },
  "homepage": "https://github.com/Rob--W/proxy-from-env#readme",
  "devDependencies": {
    "coveralls": "^3.0.9",
    "eslint": "^6.8.0",
    "istanbul": "^0.4.5",
    "mocha": "^7.1.0"
  }
}
PK�����
S[��m������	��.eslintrcnu�ȯ����������{
  "env": {
    "node": true
  },
  "rules": {
    "array-bracket-spacing": [2, "never"],
    "block-scoped-var": 2,
    "brace-style": [2, "1tbs"],
    "camelcase": 1,
    "computed-property-spacing": [2, "never"],
    "curly": 2,
    "eol-last": 2,
    "eqeqeq": [2, "smart"],
    "max-depth": [1, 3],
    "max-len": [1, 80],
    "max-statements": [1, 15],
    "new-cap": 1,
    "no-extend-native": 2,
    "no-mixed-spaces-and-tabs": 2,
    "no-trailing-spaces": 2,
    "no-unused-vars": 1,
    "no-use-before-define": [2, "nofunc"],
    "object-curly-spacing": [2, "never"],
    "quotes": [2, "single", "avoid-escape"],
    "semi": [2, "always"],
    "keyword-spacing": [2, {"before": true, "after": true}],
    "space-unary-ops": 2
  }
}
PK�����
S[H�H��H����.travis.ymlnu�ȯ����������language: node_js
node_js:
  - node
  - lts/*
script:
  - npm run lint
  # test-coverage will also run the tests, but does not print helpful output upon test failure.
  # So we also run the tests separately.
  - npm run test
  - npm run test-coverage && cat coverage/lcov.info | ./node_modules/.bin/coveralls && rm -rf coverage
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S[
�ݘ8E��8E����test.jsnu�ȯ����������/* eslint max-statements:0 */
'use strict';

var assert = require('assert');
var parseUrl = require('url').parse;

var getProxyForUrl = require('./').getProxyForUrl;

// Runs the callback with process.env temporarily set to env.
function runWithEnv(env, callback) {
  var originalEnv = process.env;
  process.env = env;
  try {
    callback();
  } finally {
    process.env = originalEnv;
  }
}

// Defines a test case that checks whether getProxyForUrl(input) === expected.
function testProxyUrl(env, expected, input) {
  assert(typeof env === 'object' && env !== null);
  // Copy object to make sure that the in param does not get modified between
  // the call of this function and the use of it below.
  env = JSON.parse(JSON.stringify(env));

var title = 'getProxyForUrl(' + JSON.stringify(input) + ')' +
     ' === ' + JSON.stringify(expected);

// Save call stack for later use.
  var stack = {};
  Error.captureStackTrace(stack, testProxyUrl);
  // Only use the last stack frame because that shows where this function is
  // called, and that is sufficient for our purpose. No need to flood the logs
  // with an uninteresting stack trace.
  stack = stack.stack.split('\n', 2)[1];

it(title, function() {
    var actual;
    runWithEnv(env, function() {
      actual = getProxyForUrl(input);
    });
    if (expected === actual) {
      return;  // Good!
    }
    try {
      assert.strictEqual(expected, actual); // Create a formatted error message.
      // Should not happen because previously we determined expected !== actual.
      throw new Error('assert.strictEqual passed. This is impossible!');
    } catch (e) {
      // Use the original stack trace, so we can see a helpful line number.
      e.stack = e.message + stack;
      throw e;
    }
  });
}

describe('getProxyForUrl', function() {
  describe('No proxy variables', function() {
    var env = {};
    testProxyUrl(env, '', 'http://example.com');
    testProxyUrl(env, '', 'https://example.com');
    testProxyUrl(env, '', 'ftp://example.com');
  });

describe('Invalid URLs', function() {
    var env = {};
    env.ALL_PROXY = 'http://unexpected.proxy';
    testProxyUrl(env, '', 'bogus');
    testProxyUrl(env, '', '//example.com');
    testProxyUrl(env, '', '://example.com');
    testProxyUrl(env, '', '://');
    testProxyUrl(env, '', '/path');
    testProxyUrl(env, '', '');
    testProxyUrl(env, '', 'http:');
    testProxyUrl(env, '', 'http:/');
    testProxyUrl(env, '', 'http://');
    testProxyUrl(env, '', 'prototype://');
    testProxyUrl(env, '', 'hasOwnProperty://');
    testProxyUrl(env, '', '__proto__://');
    testProxyUrl(env, '', undefined);
    testProxyUrl(env, '', null);
    testProxyUrl(env, '', {});
    testProxyUrl(env, '', {host: 'x', protocol: 1});
    testProxyUrl(env, '', {host: 1, protocol: 'x'});
  });

describe('http_proxy and HTTP_PROXY', function() {
    var env = {};
    env.HTTP_PROXY = 'http://http-proxy';

testProxyUrl(env, '', 'https://example');
    testProxyUrl(env, 'http://http-proxy', 'http://example');
    testProxyUrl(env, 'http://http-proxy', parseUrl('http://example'));

// eslint-disable-next-line camelcase
    env.http_proxy = 'http://priority';
    testProxyUrl(env, 'http://priority', 'http://example');
  });

describe('http_proxy with non-sensical value', function() {
    var env = {};
    // Crazy values should be passed as-is. It is the responsibility of the
    // one who launches the application that the value makes sense.
    // TODO: Should we be stricter and perform validation?
    env.HTTP_PROXY = 'Crazy \n!() { ::// }';
    testProxyUrl(env, 'Crazy \n!() { ::// }', 'http://wow');

// The implementation assumes that the HTTP_PROXY environment variable is
    // somewhat reasonable, and if the scheme is missing, it is added.
    // Garbage in, garbage out some would say...
    env.HTTP_PROXY = 'crazy without colon slash slash';
    testProxyUrl(env, 'http://crazy without colon slash slash', 'http://wow');
  });

describe('https_proxy and HTTPS_PROXY', function() {
    var env = {};
    // Assert that there is no fall back to http_proxy
    env.HTTP_PROXY = 'http://unexpected.proxy';
    testProxyUrl(env, '', 'https://example');

env.HTTPS_PROXY = 'http://https-proxy';
    testProxyUrl(env, 'http://https-proxy', 'https://example');

// eslint-disable-next-line camelcase
    env.https_proxy = 'http://priority';
    testProxyUrl(env, 'http://priority', 'https://example');
  });

describe('ftp_proxy', function() {
    var env = {};
    // Something else than http_proxy / https, as a sanity check.
    env.FTP_PROXY = 'http://ftp-proxy';

testProxyUrl(env, 'http://ftp-proxy', 'ftp://example');
    testProxyUrl(env, '', 'ftps://example');
  });

describe('all_proxy', function() {
    var env = {};
    env.ALL_PROXY = 'http://catch-all';
    testProxyUrl(env, 'http://catch-all', 'https://example');

// eslint-disable-next-line camelcase
    env.all_proxy = 'http://priority';
    testProxyUrl(env, 'http://priority', 'https://example');
  });

describe('all_proxy without scheme', function() {
    var env = {};
    env.ALL_PROXY = 'noscheme';
    testProxyUrl(env, 'http://noscheme', 'http://example');
    testProxyUrl(env, 'https://noscheme', 'https://example');

// The module does not impose restrictions on the scheme.
    testProxyUrl(env, 'bogus-scheme://noscheme', 'bogus-scheme://example');

// But the URL should still be valid.
    testProxyUrl(env, '', 'bogus');
  });

describe('no_proxy empty', function() {
    var env = {};
    env.HTTPS_PROXY = 'http://proxy';

// NO_PROXY set but empty.
    env.NO_PROXY = '';
    testProxyUrl(env, 'http://proxy', 'https://example');

// No entries in NO_PROXY (comma).
    env.NO_PROXY = ',';
    testProxyUrl(env, 'http://proxy', 'https://example');

// No entries in NO_PROXY (whitespace).
    env.NO_PROXY = ' ';
    testProxyUrl(env, 'http://proxy', 'https://example');

// No entries in NO_PROXY (multiple whitespace / commas).
    env.NO_PROXY = ',\t,,,\n,  ,\r';
    testProxyUrl(env, 'http://proxy', 'https://example');
  });

describe('no_proxy=example (single host)', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = 'example';
    testProxyUrl(env, '', 'http://example');
    testProxyUrl(env, '', 'http://example:80');
    testProxyUrl(env, '', 'http://example:0');
    testProxyUrl(env, '', 'http://example:1337');
    testProxyUrl(env, 'http://proxy', 'http://sub.example');
    testProxyUrl(env, 'http://proxy', 'http://prefexample');
    testProxyUrl(env, 'http://proxy', 'http://example.no');
    testProxyUrl(env, 'http://proxy', 'http://a.b.example');
    testProxyUrl(env, 'http://proxy', 'http://host/example');
  });

describe('no_proxy=sub.example (subdomain)', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = 'sub.example';
    testProxyUrl(env, 'http://proxy', 'http://example');
    testProxyUrl(env, 'http://proxy', 'http://example:80');
    testProxyUrl(env, 'http://proxy', 'http://example:0');
    testProxyUrl(env, 'http://proxy', 'http://example:1337');
    testProxyUrl(env, '', 'http://sub.example');
    testProxyUrl(env, 'http://proxy', 'http://no.sub.example');
    testProxyUrl(env, 'http://proxy', 'http://sub-example');
    testProxyUrl(env, 'http://proxy', 'http://example.sub');
  });

describe('no_proxy=example:80 (host + port)', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = 'example:80';
    testProxyUrl(env, '', 'http://example');
    testProxyUrl(env, '', 'http://example:80');
    testProxyUrl(env, '', 'http://example:0');
    testProxyUrl(env, 'http://proxy', 'http://example:1337');
    testProxyUrl(env, 'http://proxy', 'http://sub.example');
    testProxyUrl(env, 'http://proxy', 'http://prefexample');
    testProxyUrl(env, 'http://proxy', 'http://example.no');
    testProxyUrl(env, 'http://proxy', 'http://a.b.example');
  });

describe('no_proxy=.example (host suffix)', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = '.example';
    testProxyUrl(env, 'http://proxy', 'http://example');
    testProxyUrl(env, 'http://proxy', 'http://example:80');
    testProxyUrl(env, 'http://proxy', 'http://example:1337');
    testProxyUrl(env, '', 'http://sub.example');
    testProxyUrl(env, '', 'http://sub.example:80');
    testProxyUrl(env, '', 'http://sub.example:1337');
    testProxyUrl(env, 'http://proxy', 'http://prefexample');
    testProxyUrl(env, 'http://proxy', 'http://example.no');
    testProxyUrl(env, '', 'http://a.b.example');
  });

describe('no_proxy=*', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';
    env.NO_PROXY = '*';
    testProxyUrl(env, '', 'http://example.com');
  });

describe('no_proxy=*.example (host suffix with *.)', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = '*.example';
    testProxyUrl(env, 'http://proxy', 'http://example');
    testProxyUrl(env, 'http://proxy', 'http://example:80');
    testProxyUrl(env, 'http://proxy', 'http://example:1337');
    testProxyUrl(env, '', 'http://sub.example');
    testProxyUrl(env, '', 'http://sub.example:80');
    testProxyUrl(env, '', 'http://sub.example:1337');
    testProxyUrl(env, 'http://proxy', 'http://prefexample');
    testProxyUrl(env, 'http://proxy', 'http://example.no');
    testProxyUrl(env, '', 'http://a.b.example');
  });

describe('no_proxy=*example (substring suffix)', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = '*example';
    testProxyUrl(env, '', 'http://example');
    testProxyUrl(env, '', 'http://example:80');
    testProxyUrl(env, '', 'http://example:1337');
    testProxyUrl(env, '', 'http://sub.example');
    testProxyUrl(env, '', 'http://sub.example:80');
    testProxyUrl(env, '', 'http://sub.example:1337');
    testProxyUrl(env, '', 'http://prefexample');
    testProxyUrl(env, '', 'http://a.b.example');
    testProxyUrl(env, 'http://proxy', 'http://example.no');
    testProxyUrl(env, 'http://proxy', 'http://host/example');
  });

describe('no_proxy=.*example (arbitrary wildcards are NOT supported)',
      function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = '.*example';
    testProxyUrl(env, 'http://proxy', 'http://example');
    testProxyUrl(env, 'http://proxy', 'http://sub.example');
    testProxyUrl(env, 'http://proxy', 'http://sub.example');
    testProxyUrl(env, 'http://proxy', 'http://prefexample');
    testProxyUrl(env, 'http://proxy', 'http://x.prefexample');
    testProxyUrl(env, 'http://proxy', 'http://a.b.example');
  });

describe('no_proxy=[::1],[::2]:80,10.0.0.1,10.0.0.2:80 (IP addresses)',
      function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = '[::1],[::2]:80,10.0.0.1,10.0.0.2:80';
    testProxyUrl(env, '', 'http://[::1]/');
    testProxyUrl(env, '', 'http://[::1]:80/');
    testProxyUrl(env, '', 'http://[::1]:1337/');

testProxyUrl(env, '', 'http://[::2]/');
    testProxyUrl(env, '', 'http://[::2]:80/');
    testProxyUrl(env, 'http://proxy', 'http://[::2]:1337/');

testProxyUrl(env, '', 'http://10.0.0.1/');
    testProxyUrl(env, '', 'http://10.0.0.1:80/');
    testProxyUrl(env, '', 'http://10.0.0.1:1337/');

testProxyUrl(env, '', 'http://10.0.0.2/');
    testProxyUrl(env, '', 'http://10.0.0.2:80/');
    testProxyUrl(env, 'http://proxy', 'http://10.0.0.2:1337/');
  });

describe('no_proxy=127.0.0.1/32 (CIDR is NOT supported)', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = '127.0.0.1/32';
    testProxyUrl(env, 'http://proxy', 'http://127.0.0.1');
    testProxyUrl(env, 'http://proxy', 'http://127.0.0.1/32');
  });

describe('no_proxy=127.0.0.1 does NOT match localhost', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';

env.NO_PROXY = '127.0.0.1';
    testProxyUrl(env, '', 'http://127.0.0.1');
    // We're not performing DNS queries, so this shouldn't match.
    testProxyUrl(env, 'http://proxy', 'http://localhost');
  });

describe('no_proxy with protocols that have a default port', function() {
    var env = {};
    env.WS_PROXY = 'http://ws';
    env.WSS_PROXY = 'http://wss';
    env.HTTP_PROXY = 'http://http';
    env.HTTPS_PROXY = 'http://https';
    env.GOPHER_PROXY = 'http://gopher';
    env.FTP_PROXY = 'http://ftp';
    env.ALL_PROXY = 'http://all';

env.NO_PROXY = 'xxx:21,xxx:70,xxx:80,xxx:443';

testProxyUrl(env, '', 'http://xxx');
    testProxyUrl(env, '', 'http://xxx:80');
    testProxyUrl(env, 'http://http', 'http://xxx:1337');

testProxyUrl(env, '', 'ws://xxx');
    testProxyUrl(env, '', 'ws://xxx:80');
    testProxyUrl(env, 'http://ws', 'ws://xxx:1337');

testProxyUrl(env, '', 'https://xxx');
    testProxyUrl(env, '', 'https://xxx:443');
    testProxyUrl(env, 'http://https', 'https://xxx:1337');

testProxyUrl(env, '', 'wss://xxx');
    testProxyUrl(env, '', 'wss://xxx:443');
    testProxyUrl(env, 'http://wss', 'wss://xxx:1337');

testProxyUrl(env, '', 'gopher://xxx');
    testProxyUrl(env, '', 'gopher://xxx:70');
    testProxyUrl(env, 'http://gopher', 'gopher://xxx:1337');

testProxyUrl(env, '', 'ftp://xxx');
    testProxyUrl(env, '', 'ftp://xxx:21');
    testProxyUrl(env, 'http://ftp', 'ftp://xxx:1337');
  });

describe('no_proxy should not be case-sensitive', function() {
    var env = {};
    env.HTTP_PROXY = 'http://proxy';
    env.NO_PROXY = 'XXX,YYY,ZzZ';

testProxyUrl(env, '', 'http://xxx');
    testProxyUrl(env, '', 'http://XXX');
    testProxyUrl(env, '', 'http://yyy');
    testProxyUrl(env, '', 'http://YYY');
    testProxyUrl(env, '', 'http://ZzZ');
    testProxyUrl(env, '', 'http://zZz');
  });

describe('NPM proxy configuration', function() {
    describe('npm_config_http_proxy should work', function() {
      var env = {};
      // eslint-disable-next-line camelcase
      env.npm_config_http_proxy = 'http://http-proxy';

testProxyUrl(env, '', 'https://example');
      testProxyUrl(env, 'http://http-proxy', 'http://example');

// eslint-disable-next-line camelcase
      env.npm_config_http_proxy = 'http://priority';
      testProxyUrl(env, 'http://priority', 'http://example');
    });
    // eslint-disable-next-line max-len
    describe('npm_config_http_proxy should take precedence over HTTP_PROXY and npm_config_proxy', function() {
      var env = {};
      // eslint-disable-next-line camelcase
      env.npm_config_http_proxy = 'http://http-proxy';
      // eslint-disable-next-line camelcase
      env.npm_config_proxy = 'http://unexpected-proxy';
      env.HTTP_PROXY = 'http://unexpected-proxy';

testProxyUrl(env, 'http://http-proxy', 'http://example');
    });
    describe('npm_config_https_proxy should work', function() {
      var env = {};
      // eslint-disable-next-line camelcase
      env.npm_config_http_proxy = 'http://unexpected.proxy';
      testProxyUrl(env, '', 'https://example');

// eslint-disable-next-line camelcase
      env.npm_config_https_proxy = 'http://https-proxy';
      testProxyUrl(env, 'http://https-proxy', 'https://example');

// eslint-disable-next-line camelcase
      env.npm_config_https_proxy = 'http://priority';
      testProxyUrl(env, 'http://priority', 'https://example');
    });
    // eslint-disable-next-line max-len
    describe('npm_config_https_proxy should take precedence over HTTPS_PROXY and npm_config_proxy', function() {
      var env = {};
      // eslint-disable-next-line camelcase
      env.npm_config_https_proxy = 'http://https-proxy';
      // eslint-disable-next-line camelcase
      env.npm_config_proxy = 'http://unexpected-proxy';
      env.HTTPS_PROXY = 'http://unexpected-proxy';

testProxyUrl(env, 'http://https-proxy', 'https://example');
    });
    describe('npm_config_proxy should work', function() {
      var env = {};
      // eslint-disable-next-line camelcase
      env.npm_config_proxy = 'http://http-proxy';
      testProxyUrl(env, 'http://http-proxy', 'http://example');
      testProxyUrl(env, 'http://http-proxy', 'https://example');

// eslint-disable-next-line camelcase
      env.npm_config_proxy = 'http://priority';
      testProxyUrl(env, 'http://priority', 'http://example');
      testProxyUrl(env, 'http://priority', 'https://example');
    });
    // eslint-disable-next-line max-len
    describe('HTTP_PROXY and HTTPS_PROXY should take precedence over npm_config_proxy', function() {
      var env = {};
      env.HTTP_PROXY = 'http://http-proxy';
      env.HTTPS_PROXY = 'http://https-proxy';
      // eslint-disable-next-line camelcase
      env.npm_config_proxy = 'http://unexpected-proxy';
      testProxyUrl(env, 'http://http-proxy', 'http://example');
      testProxyUrl(env, 'http://https-proxy', 'https://example');
    });
    describe('npm_config_no_proxy should work', function() {
      var env = {};
      env.HTTP_PROXY = 'http://proxy';
      // eslint-disable-next-line camelcase
      env.npm_config_no_proxy = 'example';

testProxyUrl(env, '', 'http://example');
      testProxyUrl(env, 'http://proxy', 'http://otherwebsite');
    });
    // eslint-disable-next-line max-len
    describe('npm_config_no_proxy should take precedence over NO_PROXY', function() {
      var env = {};
      env.HTTP_PROXY = 'http://proxy';
      env.NO_PROXY = 'otherwebsite';
      // eslint-disable-next-line camelcase
      env.npm_config_no_proxy = 'example';

testProxyUrl(env, '', 'http://example');
      testProxyUrl(env, 'http://proxy', 'http://otherwebsite');
    });
  });
});
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var parseUrl = require('url').parse;

var DEFAULT_PORTS = {
  ftp: 21,
  gopher: 70,
  http: 80,
  https: 443,
  ws: 80,
  wss: 443,
};

var stringEndsWith = String.prototype.endsWith || function(s) {
  return s.length <= this.length &&
    this.indexOf(s, this.length - s.length) !== -1;
};

/**
 * @param {string|object} url - The URL, or the result from url.parse.
 * @return {string} The URL of the proxy that should handle the request to the
 *  given URL. If no proxy is set, this will be an empty string.
 */
function getProxyForUrl(url) {
  var parsedUrl = typeof url === 'string' ? parseUrl(url) : url || {};
  var proto = parsedUrl.protocol;
  var hostname = parsedUrl.host;
  var port = parsedUrl.port;
  if (typeof hostname !== 'string' || !hostname || typeof proto !== 'string') {
    return '';  // Don't proxy URLs without a valid scheme or host.
  }

proto = proto.split(':', 1)[0];
  // Stripping ports in this way instead of using parsedUrl.hostname to make
  // sure that the brackets around IPv6 addresses are kept.
  hostname = hostname.replace(/:\d*$/, '');
  port = parseInt(port) || DEFAULT_PORTS[proto] || 0;
  if (!shouldProxy(hostname, port)) {
    return '';  // Don't proxy URLs that match NO_PROXY.
  }

var proxy =
    getEnv('npm_config_' + proto + '_proxy') ||
    getEnv(proto + '_proxy') ||
    getEnv('npm_config_proxy') ||
    getEnv('all_proxy');
  if (proxy && proxy.indexOf('://') === -1) {
    // Missing scheme in proxy, default to the requested URL's scheme.
    proxy = proto + '://' + proxy;
  }
  return proxy;
}

/**
 * Determines whether a given URL should be proxied.
 *
 * @param {string} hostname - The host name of the URL.
 * @param {number} port - The effective port of the URL.
 * @returns {boolean} Whether the given URL should be proxied.
 * @private
 */
function shouldProxy(hostname, port) {
  var NO_PROXY =
    (getEnv('npm_config_no_proxy') || getEnv('no_proxy')).toLowerCase();
  if (!NO_PROXY) {
    return true;  // Always proxy if NO_PROXY is not set.
  }
  if (NO_PROXY === '*') {
    return false;  // Never proxy if wildcard is set.
  }

return NO_PROXY.split(/[,\s]/).every(function(proxy) {
    if (!proxy) {
      return true;  // Skip zero-length hosts.
    }
    var parsedProxy = proxy.match(/^(.+):(\d+)$/);
    var parsedProxyHostname = parsedProxy ? parsedProxy[1] : proxy;
    var parsedProxyPort = parsedProxy ? parseInt(parsedProxy[2]) : 0;
    if (parsedProxyPort && parsedProxyPort !== port) {
      return true;  // Skip if ports don't match.
    }

if (!/^[.*]/.test(parsedProxyHostname)) {
      // No wildcards, so stop proxying if there is an exact match.
      return hostname !== parsedProxyHostname;
    }

if (parsedProxyHostname.charAt(0) === '*') {
      // Remove leading wildcard.
      parsedProxyHostname = parsedProxyHostname.slice(1);
    }
    // Stop proxying if the hostname ends with the no_proxy host.
    return !stringEndsWith.call(hostname, parsedProxyHostname);
  });
}

/**
 * Get the value for an environment variable.
 *
 * @param {string} key - The name of the environment variable.
 * @return {string} The value of the environment variable.
 * @private
 */
function getEnv(key) {
  return process.env[key.toLowerCase()] || process.env[key.toUpperCase()] || '';
}

exports.getProxyForUrl = getProxyForUrl;
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