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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | // Copyright 2010-2012 Mikeal Rogers // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // This is a heavily lobotomized version of request@2.88.2, with no // external dependencies and keeping only the functionality we use. 'use strict' var http = require('http') var https = require('https') var stream = require('stream') var url = require('url') var util = require('util') function Request ({ uri, headers }) { var self = this stream.Stream.call(self) self.uri = uri self.headers = headers self.readable = true self.maxRedirects = 10 self.redirectsFollowed = 0 self.init() } util.inherits(Request, stream.Stream) Request.prototype.init = function () { // init() contains all the code to setup the request object. // the actual outgoing request is not started until start() is called // this function is called from both the constructor and on redirect. var self = this self.headers = Object.assign({}, self.headers) if (self.uri.path) { self.path = self.uri.path } else { self.path = self.uri.pathname + (self.uri.search || '') } var protocol = self.uri.protocol var defaultModules = {'http:': http, 'https:': https} self.httpModule = defaultModules[protocol] if (!self.httpModule) { return self.emit('error', new Error('Invalid protocol: ' + protocol)) } setImmediate(function () { self.start() }) } Request.prototype.start = function () { // start() is called once we are ready to send the outgoing HTTP request. // this is usually called on the first write(), end() or on nextTick() var self = this if (self._started) { return } self._started = true var reqOptions = { headers: self.headers, host: self.uri.hostname, port: self.uri.port, path: self.path, } try { self.req = self.httpModule.request(reqOptions) } catch (err) { self.emit('error', err) return } self.req.on('response', self.onRequestResponse.bind(self)) self.req.on('error', function (error) { self.emit('error', error) }) self.req.on('drain', function () { self.emit('drain') }) self.req.on('socket', function (socket) { self.emit('socket', socket) }) self.req.end() } Request.prototype.onRequestResponse = function (response) { var self = this self.response = response if (self.tryRedirect(response)) { return // Ignore the rest of the response } else { // Be a good stream and emit end when the response is finished. // Hack to emit end on close because of a core bug that never fires end response.on('close', function () { if (!self._ended) { self.response.emit('end') } }) response.once('end', function () { self._ended = true }) if (self._paused) { response.pause() } self.responseContent = response response.on('data', function (chunk) { self.emit('data', chunk) }) response.once('end', function (chunk) { self.emit('end', chunk) }) response.on('error', function (error) { self.emit('error', error) }) response.on('close', function () { self.emit('close') }) } } Request.prototype.tryRedirect = function (response) { var self = this if (response.statusCode < 300 || response.statusCode >= 400 || !('location' in response.headers)) { return false } var redirectTo = response.headers.location // ignore any potential response body. it cannot possibly be useful // to us at this point. // response.resume should be defined, but check anyway before calling. Workaround for browserify. if (response.resume) { response.resume() } if (self.redirectsFollowed >= self.maxRedirects) { self.emit('error', new Error('Exceeded maxRedirects. Probably stuck in a redirect loop ' + self.uri.href)) return false } self.redirectsFollowed += 1 if (!isUrl.test(redirectTo)) { redirectTo = url.resolve(self.uri.href, redirectTo) } self.headers.referer = self.uri.href self.uri = url.parse(redirectTo) delete self.req delete self._started self.init() return true } // Stream API Request.prototype.pause = function () { var self = this if (!self.responseContent) { self._paused = true } else { self.responseContent.pause() } } Request.prototype.resume = function () { var self = this if (!self.responseContent) { self._paused = false } else { self.responseContent.resume() } } Request.prototype.destroy = function () { var self = this if (self.response) { self.response.destroy() } } var isUrl = /^https?:/ function request (params) { return new Request(params) } // Exports module.exports = request |