Initial implementation; copy of express logic

.gitignore

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+node_modules/

.npmignore

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+test/
+.travis.yml

.travis.yml

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+language: node_js
+node_js:
+  - "0.8"
+  - "0.10"
+  - "0.11"
+matrix:
+  allow_failures:
+    - node_js: "0.11"
+  fast_finish: true

History.md

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+HEAD
+====
+
+  * Initial release

LICENSE

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+(The MIT License)
+
+Copyright (c) 2014 Douglas Christopher Wilson
+
+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.

README.md

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+# proxy-addr [![Build Status](https://travis-ci.org/expressjs/proxy-addr.svg?branch=master)](https://travis-ci.org/expressjs/proxy-addr) [![NPM version](https://badge.fury.io/js/proxy-addr.svg)](http://badge.fury.io/js/proxy-addr)
+
+Determine address of proxied request
+
+## Install
+
+    npm install proxy-addr
+
+## API
+
+    var proxyaddr = require('proxy-addr');
+
+### proxyaddr(req)
+
+Return the address of the request. This returns the furthest-away
+address.
+
+### proxyaddr.all(req)
+
+Return all the addresses of the request. This array is ordered from
+closest to furthest (i.e. `arr[0] === req.connection.remoteAddress`).
+
+## License
+
+[MIT](LICENSE)

index.js

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+/*!
+ * proxy-addr
+ * Copyright(c) 2014 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+/**
+ * Module exports.
+ */
+
+module.exports = proxyaddr;
+module.exports.all = proxyaddrs;
+
+/**
+ * Determine IP of proxied request.
+ *
+ * @param {Object} request
+ * @api public
+ */
+
+function proxyaddr(req) {
+  var addrs = proxyaddrs(req);
+
+  return addrs[addrs.length - 1];
+}
+
+/**
+ * Get all addresses in the request.
+ *
+ * @param {Object} request
+ * @api public
+ */
+
+function proxyaddrs(req) {
+  if (!req) throw new TypeError('req argument is required');
+
+  var proxyAddrs = (req.headers['x-forwarded-for'] || '')
+    .split(/ *, */)
+    .filter(isTruthy)
+    .reverse();
+  var socketAddr = req.connection.remoteAddress;
+
+  return [socketAddr].concat(proxyAddrs);
+}
+
+function isTruthy(val) {
+  return Boolean(val);
+}

package.json

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+{
+  "name": "proxy-addr",
+  "description": "Determine address of proxied request",
+  "version": "0.0.0",
+  "author": "Douglas Christopher Wilson <doug@somethingdoug.com>",
+  "license": "MIT",
+  "keywords": [
+    "ip",
+    "proxy",
+    "x-forwarded-for"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/expressjs/proxy-ip.git"
+  },
+  "bugs": {
+    "url": "https://github.com/expressjs/proxy-ip/issues"
+  },
+  "dependencies": {},
+  "devDependencies": {
+    "mocha": "~1.18.2",
+    "should": "~3.3.1"
+  },
+  "engines": {
+    "node": ">= 0.8.0"
+  },
+  "scripts": {
+    "test": "mocha --reporter spec test/"
+  }
+}

test/test.js

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+
+var proxyaddr = require('..');
+var should = require('should');
+
+describe('proxyaddr(req)', function () {
+  describe('arguments', function () {
+    describe('req', function () {
+      it('should be required', function () {
+        proxyaddr.bind().should.throw(/req.*required/);
+      });
+    });
+  });
+
+  describe('with no headers', function () {
+    it('should return socket address', function () {
+      var req = createReq('127.0.0.1');
+      proxyaddr(req).should.equal('127.0.0.1');
+    });
+  });
+
+  describe('with x-forwarded-for header', function () {
+    describe('single', function () {
+      it('should return x-forwarded-for', function () {
+        var req = createReq('127.0.0.1', {
+          'x-forwarded-for': '10.0.0.1'
+        });
+        proxyaddr(req).should.equal('10.0.0.1');
+      });
+    });
+
+    describe('multiple', function () {
+      it('should return left-most', function () {
+        var req = createReq('127.0.0.1', {
+          'x-forwarded-for': '10.0.0.1, 10.0.0.2'
+        });
+        proxyaddr(req).should.equal('10.0.0.1');
+      });
+    });
+  });
+});
+
+describe('proxyaddr.all(req)', function () {
+  describe('arguments', function () {
+    describe('req', function () {
+      it('should be required', function () {
+        proxyaddr.all.bind().should.throw(/req.*required/);
+      });
+    });
+  });
+
+  describe('with no headers', function () {
+    it('should return socket address', function () {
+      var req = createReq('127.0.0.1');
+      proxyaddr.all(req).should.eql(['127.0.0.1']);
+    });
+  });
+
+  describe('with x-forwarded-for header', function () {
+    describe('single', function () {
+      it('should include x-forwarded-for', function () {
+        var req = createReq('127.0.0.1', {
+          'x-forwarded-for': '10.0.0.1'
+        });
+        proxyaddr.all(req).should.eql(['127.0.0.1', '10.0.0.1']);
+      });
+    });
+
+    describe('multiple', function () {
+      it('should include x-forwarded-for', function () {
+        var req = createReq('127.0.0.1', {
+          'x-forwarded-for': '10.0.0.1, 10.0.0.2'
+        });
+        proxyaddr.all(req).should.eql(['127.0.0.1', '10.0.0.2', '10.0.0.1']);
+      });
+    });
+  });
+});
+
+function createReq(socketAddr, headers) {
+  return {
+    connection: {
+      remoteAddress: socketAddr
+    },
+    headers: headers || {}
+  };
+}