1 | var url = require("url");
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2 | var URL = url.URL;
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3 | var http = require("http");
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4 | var https = require("https");
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5 | var Writable = require("stream").Writable;
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6 | var assert = require("assert");
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7 | var debug = require("./debug");
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8 |
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9 | // Create handlers that pass events from native requests
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10 | var events = ["abort", "aborted", "connect", "error", "socket", "timeout"];
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11 | var eventHandlers = Object.create(null);
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12 | events.forEach(function (event) {
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13 | eventHandlers[event] = function (arg1, arg2, arg3) {
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14 | this._redirectable.emit(event, arg1, arg2, arg3);
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15 | };
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16 | });
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17 |
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18 | // Error types with codes
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19 | var RedirectionError = createErrorType(
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20 | "ERR_FR_REDIRECTION_FAILURE",
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21 | "Redirected request failed"
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22 | );
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23 | var TooManyRedirectsError = createErrorType(
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24 | "ERR_FR_TOO_MANY_REDIRECTS",
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25 | "Maximum number of redirects exceeded"
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26 | );
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27 | var MaxBodyLengthExceededError = createErrorType(
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28 | "ERR_FR_MAX_BODY_LENGTH_EXCEEDED",
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29 | "Request body larger than maxBodyLength limit"
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30 | );
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31 | var WriteAfterEndError = createErrorType(
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32 | "ERR_STREAM_WRITE_AFTER_END",
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33 | "write after end"
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34 | );
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35 |
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36 | // An HTTP(S) request that can be redirected
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37 | function RedirectableRequest(options, responseCallback) {
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38 | // Initialize the request
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39 | Writable.call(this);
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40 | this._sanitizeOptions(options);
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41 | this._options = options;
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42 | this._ended = false;
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43 | this._ending = false;
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44 | this._redirectCount = 0;
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45 | this._redirects = [];
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46 | this._requestBodyLength = 0;
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47 | this._requestBodyBuffers = [];
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48 |
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49 | // Attach a callback if passed
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50 | if (responseCallback) {
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51 | this.on("response", responseCallback);
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52 | }
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53 |
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54 | // React to responses of native requests
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55 | var self = this;
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56 | this._onNativeResponse = function (response) {
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57 | self._processResponse(response);
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58 | };
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59 |
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60 | // Perform the first request
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61 | this._performRequest();
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62 | }
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63 | RedirectableRequest.prototype = Object.create(Writable.prototype);
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64 |
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65 | RedirectableRequest.prototype.abort = function () {
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66 | abortRequest(this._currentRequest);
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67 | this.emit("abort");
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68 | };
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69 |
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70 | // Writes buffered data to the current native request
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71 | RedirectableRequest.prototype.write = function (data, encoding, callback) {
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72 | // Writing is not allowed if end has been called
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73 | if (this._ending) {
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74 | throw new WriteAfterEndError();
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75 | }
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76 |
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77 | // Validate input and shift parameters if necessary
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78 | if (!(typeof data === "string" || typeof data === "object" && ("length" in data))) {
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79 | throw new TypeError("data should be a string, Buffer or Uint8Array");
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80 | }
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81 | if (typeof encoding === "function") {
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82 | callback = encoding;
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83 | encoding = null;
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84 | }
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85 |
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86 | // Ignore empty buffers, since writing them doesn't invoke the callback
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87 | // https://github.com/nodejs/node/issues/22066
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88 | if (data.length === 0) {
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89 | if (callback) {
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90 | callback();
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91 | }
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92 | return;
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93 | }
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94 | // Only write when we don't exceed the maximum body length
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95 | if (this._requestBodyLength + data.length <= this._options.maxBodyLength) {
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96 | this._requestBodyLength += data.length;
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97 | this._requestBodyBuffers.push({ data: data, encoding: encoding });
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98 | this._currentRequest.write(data, encoding, callback);
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99 | }
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100 | // Error when we exceed the maximum body length
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101 | else {
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102 | this.emit("error", new MaxBodyLengthExceededError());
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103 | this.abort();
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104 | }
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105 | };
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106 |
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107 | // Ends the current native request
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108 | RedirectableRequest.prototype.end = function (data, encoding, callback) {
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109 | // Shift parameters if necessary
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110 | if (typeof data === "function") {
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111 | callback = data;
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112 | data = encoding = null;
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113 | }
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114 | else if (typeof encoding === "function") {
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115 | callback = encoding;
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116 | encoding = null;
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117 | }
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118 |
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119 | // Write data if needed and end
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120 | if (!data) {
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121 | this._ended = this._ending = true;
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122 | this._currentRequest.end(null, null, callback);
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123 | }
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124 | else {
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125 | var self = this;
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126 | var currentRequest = this._currentRequest;
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127 | this.write(data, encoding, function () {
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128 | self._ended = true;
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129 | currentRequest.end(null, null, callback);
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130 | });
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131 | this._ending = true;
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132 | }
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133 | };
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134 |
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135 | // Sets a header value on the current native request
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136 | RedirectableRequest.prototype.setHeader = function (name, value) {
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137 | this._options.headers[name] = value;
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138 | this._currentRequest.setHeader(name, value);
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139 | };
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140 |
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141 | // Clears a header value on the current native request
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142 | RedirectableRequest.prototype.removeHeader = function (name) {
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143 | delete this._options.headers[name];
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144 | this._currentRequest.removeHeader(name);
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145 | };
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146 |
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147 | // Global timeout for all underlying requests
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148 | RedirectableRequest.prototype.setTimeout = function (msecs, callback) {
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149 | var self = this;
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150 |
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151 | // Destroys the socket on timeout
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152 | function destroyOnTimeout(socket) {
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153 | socket.setTimeout(msecs);
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154 | socket.removeListener("timeout", socket.destroy);
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155 | socket.addListener("timeout", socket.destroy);
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156 | }
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157 |
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158 | // Sets up a timer to trigger a timeout event
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159 | function startTimer(socket) {
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160 | if (self._timeout) {
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161 | clearTimeout(self._timeout);
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162 | }
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163 | self._timeout = setTimeout(function () {
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164 | self.emit("timeout");
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165 | clearTimer();
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166 | }, msecs);
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167 | destroyOnTimeout(socket);
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168 | }
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169 |
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170 | // Stops a timeout from triggering
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171 | function clearTimer() {
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172 | // Clear the timeout
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173 | if (self._timeout) {
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174 | clearTimeout(self._timeout);
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175 | self._timeout = null;
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176 | }
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177 |
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178 | // Clean up all attached listeners
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179 | self.removeListener("abort", clearTimer);
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180 | self.removeListener("error", clearTimer);
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181 | self.removeListener("response", clearTimer);
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182 | if (callback) {
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183 | self.removeListener("timeout", callback);
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184 | }
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185 | if (!self.socket) {
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186 | self._currentRequest.removeListener("socket", startTimer);
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187 | }
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188 | }
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189 |
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190 | // Attach callback if passed
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191 | if (callback) {
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192 | this.on("timeout", callback);
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193 | }
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194 |
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195 | // Start the timer if or when the socket is opened
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196 | if (this.socket) {
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197 | startTimer(this.socket);
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198 | }
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199 | else {
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200 | this._currentRequest.once("socket", startTimer);
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201 | }
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202 |
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203 | // Clean up on events
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204 | this.on("socket", destroyOnTimeout);
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205 | this.on("abort", clearTimer);
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206 | this.on("error", clearTimer);
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207 | this.on("response", clearTimer);
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208 |
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209 | return this;
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210 | };
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211 |
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212 | // Proxy all other public ClientRequest methods
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213 | [
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214 | "flushHeaders", "getHeader",
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215 | "setNoDelay", "setSocketKeepAlive",
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216 | ].forEach(function (method) {
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217 | RedirectableRequest.prototype[method] = function (a, b) {
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218 | return this._currentRequest[method](a, b);
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219 | };
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220 | });
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221 |
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222 | // Proxy all public ClientRequest properties
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223 | ["aborted", "connection", "socket"].forEach(function (property) {
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224 | Object.defineProperty(RedirectableRequest.prototype, property, {
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225 | get: function () { return this._currentRequest[property]; },
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226 | });
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227 | });
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228 |
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229 | RedirectableRequest.prototype._sanitizeOptions = function (options) {
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230 | // Ensure headers are always present
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231 | if (!options.headers) {
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232 | options.headers = {};
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233 | }
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234 |
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235 | // Since http.request treats host as an alias of hostname,
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236 | // but the url module interprets host as hostname plus port,
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237 | // eliminate the host property to avoid confusion.
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238 | if (options.host) {
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239 | // Use hostname if set, because it has precedence
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240 | if (!options.hostname) {
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241 | options.hostname = options.host;
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242 | }
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243 | delete options.host;
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244 | }
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245 |
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246 | // Complete the URL object when necessary
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247 | if (!options.pathname && options.path) {
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248 | var searchPos = options.path.indexOf("?");
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249 | if (searchPos < 0) {
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250 | options.pathname = options.path;
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251 | }
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252 | else {
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253 | options.pathname = options.path.substring(0, searchPos);
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254 | options.search = options.path.substring(searchPos);
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255 | }
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256 | }
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257 | };
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258 |
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259 |
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260 | // Executes the next native request (initial or redirect)
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261 | RedirectableRequest.prototype._performRequest = function () {
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262 | // Load the native protocol
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263 | var protocol = this._options.protocol;
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264 | var nativeProtocol = this._options.nativeProtocols[protocol];
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265 | if (!nativeProtocol) {
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266 | this.emit("error", new TypeError("Unsupported protocol " + protocol));
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267 | return;
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268 | }
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269 |
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270 | // If specified, use the agent corresponding to the protocol
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271 | // (HTTP and HTTPS use different types of agents)
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272 | if (this._options.agents) {
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273 | var scheme = protocol.substr(0, protocol.length - 1);
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274 | this._options.agent = this._options.agents[scheme];
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275 | }
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276 |
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277 | // Create the native request
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278 | var request = this._currentRequest =
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279 | nativeProtocol.request(this._options, this._onNativeResponse);
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280 | this._currentUrl = url.format(this._options);
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281 |
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282 | // Set up event handlers
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283 | request._redirectable = this;
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284 | for (var e = 0; e < events.length; e++) {
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285 | request.on(events[e], eventHandlers[events[e]]);
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286 | }
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287 |
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288 | // End a redirected request
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289 | // (The first request must be ended explicitly with RedirectableRequest#end)
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290 | if (this._isRedirect) {
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291 | // Write the request entity and end.
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292 | var i = 0;
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293 | var self = this;
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294 | var buffers = this._requestBodyBuffers;
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295 | (function writeNext(error) {
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296 | // Only write if this request has not been redirected yet
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297 | /* istanbul ignore else */
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298 | if (request === self._currentRequest) {
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299 | // Report any write errors
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300 | /* istanbul ignore if */
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301 | if (error) {
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302 | self.emit("error", error);
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303 | }
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304 | // Write the next buffer if there are still left
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305 | else if (i < buffers.length) {
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306 | var buffer = buffers[i++];
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307 | /* istanbul ignore else */
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308 | if (!request.finished) {
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309 | request.write(buffer.data, buffer.encoding, writeNext);
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310 | }
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311 | }
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312 | // End the request if `end` has been called on us
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313 | else if (self._ended) {
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314 | request.end();
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315 | }
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316 | }
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317 | }());
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318 | }
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319 | };
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320 |
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321 | // Processes a response from the current native request
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322 | RedirectableRequest.prototype._processResponse = function (response) {
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323 | // Store the redirected response
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324 | var statusCode = response.statusCode;
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325 | if (this._options.trackRedirects) {
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326 | this._redirects.push({
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327 | url: this._currentUrl,
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328 | headers: response.headers,
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329 | statusCode: statusCode,
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330 | });
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331 | }
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332 |
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333 | // RFC7231§6.4: The 3xx (Redirection) class of status code indicates
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334 | // that further action needs to be taken by the user agent in order to
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335 | // fulfill the request. If a Location header field is provided,
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336 | // the user agent MAY automatically redirect its request to the URI
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337 | // referenced by the Location field value,
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338 | // even if the specific status code is not understood.
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339 | var location = response.headers.location;
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340 | if (location && this._options.followRedirects !== false &&
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341 | statusCode >= 300 && statusCode < 400) {
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342 | // Abort the current request
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343 | abortRequest(this._currentRequest);
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344 | // Discard the remainder of the response to avoid waiting for data
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345 | response.destroy();
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346 |
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347 | // RFC7231§6.4: A client SHOULD detect and intervene
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348 | // in cyclical redirections (i.e., "infinite" redirection loops).
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349 | if (++this._redirectCount > this._options.maxRedirects) {
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350 | this.emit("error", new TooManyRedirectsError());
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351 | return;
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352 | }
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353 |
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354 | // RFC7231§6.4: Automatic redirection needs to done with
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355 | // care for methods not known to be safe, […]
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356 | // RFC7231§6.4.2–3: For historical reasons, a user agent MAY change
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357 | // the request method from POST to GET for the subsequent request.
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358 | if ((statusCode === 301 || statusCode === 302) && this._options.method === "POST" ||
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359 | // RFC7231§6.4.4: The 303 (See Other) status code indicates that
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360 | // the server is redirecting the user agent to a different resource […]
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361 | // A user agent can perform a retrieval request targeting that URI
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362 | // (a GET or HEAD request if using HTTP) […]
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363 | (statusCode === 303) && !/^(?:GET|HEAD)$/.test(this._options.method)) {
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364 | this._options.method = "GET";
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365 | // Drop a possible entity and headers related to it
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366 | this._requestBodyBuffers = [];
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367 | removeMatchingHeaders(/^content-/i, this._options.headers);
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368 | }
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369 |
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370 | // Drop the Host header, as the redirect might lead to a different host
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371 | var currentHostHeader = removeMatchingHeaders(/^host$/i, this._options.headers);
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372 |
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373 | // If the redirect is relative, carry over the host of the last request
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374 | var currentUrlParts = url.parse(this._currentUrl);
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375 | var currentHost = currentHostHeader || currentUrlParts.host;
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376 | var currentUrl = /^\w+:/.test(location) ? this._currentUrl :
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377 | url.format(Object.assign(currentUrlParts, { host: currentHost }));
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378 |
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379 | // Determine the URL of the redirection
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380 | var redirectUrl;
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381 | try {
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382 | redirectUrl = url.resolve(currentUrl, location);
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383 | }
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384 | catch (cause) {
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385 | this.emit("error", new RedirectionError(cause));
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386 | return;
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387 | }
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388 |
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389 | // Create the redirected request
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390 | debug("redirecting to", redirectUrl);
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391 | this._isRedirect = true;
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392 | var redirectUrlParts = url.parse(redirectUrl);
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393 | Object.assign(this._options, redirectUrlParts);
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394 |
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395 | // Drop the Authorization header if redirecting to another domain
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396 | if (!(redirectUrlParts.host === currentHost || isSubdomainOf(redirectUrlParts.host, currentHost))) {
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397 | removeMatchingHeaders(/^authorization$/i, this._options.headers);
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398 | }
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399 |
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400 | // Evaluate the beforeRedirect callback
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401 | if (typeof this._options.beforeRedirect === "function") {
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402 | var responseDetails = { headers: response.headers };
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403 | try {
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404 | this._options.beforeRedirect.call(null, this._options, responseDetails);
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405 | }
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406 | catch (err) {
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407 | this.emit("error", err);
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408 | return;
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409 | }
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410 | this._sanitizeOptions(this._options);
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411 | }
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412 |
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413 | // Perform the redirected request
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414 | try {
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415 | this._performRequest();
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416 | }
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417 | catch (cause) {
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418 | this.emit("error", new RedirectionError(cause));
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419 | }
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420 | }
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421 | else {
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422 | // The response is not a redirect; return it as-is
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423 | response.responseUrl = this._currentUrl;
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424 | response.redirects = this._redirects;
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425 | this.emit("response", response);
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426 |
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427 | // Clean up
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428 | this._requestBodyBuffers = [];
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429 | }
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430 | };
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431 |
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432 | // Wraps the key/value object of protocols with redirect functionality
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433 | function wrap(protocols) {
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434 | // Default settings
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435 | var exports = {
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436 | maxRedirects: 21,
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437 | maxBodyLength: 10 * 1024 * 1024,
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438 | };
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439 |
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440 | // Wrap each protocol
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441 | var nativeProtocols = {};
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442 | Object.keys(protocols).forEach(function (scheme) {
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443 | var protocol = scheme + ":";
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444 | var nativeProtocol = nativeProtocols[protocol] = protocols[scheme];
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445 | var wrappedProtocol = exports[scheme] = Object.create(nativeProtocol);
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446 |
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447 | // Executes a request, following redirects
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448 | function request(input, options, callback) {
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449 | // Parse parameters
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450 | if (typeof input === "string") {
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451 | var urlStr = input;
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452 | try {
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453 | input = urlToOptions(new URL(urlStr));
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454 | }
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455 | catch (err) {
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456 | /* istanbul ignore next */
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457 | input = url.parse(urlStr);
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458 | }
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459 | }
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460 | else if (URL && (input instanceof URL)) {
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461 | input = urlToOptions(input);
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462 | }
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463 | else {
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464 | callback = options;
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465 | options = input;
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466 | input = { protocol: protocol };
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467 | }
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468 | if (typeof options === "function") {
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469 | callback = options;
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470 | options = null;
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471 | }
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472 |
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473 | // Set defaults
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474 | options = Object.assign({
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475 | maxRedirects: exports.maxRedirects,
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476 | maxBodyLength: exports.maxBodyLength,
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477 | }, input, options);
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478 | options.nativeProtocols = nativeProtocols;
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479 |
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480 | assert.equal(options.protocol, protocol, "protocol mismatch");
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481 | debug("options", options);
|
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482 | return new RedirectableRequest(options, callback);
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483 | }
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484 |
|
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485 | // Executes a GET request, following redirects
|
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486 | function get(input, options, callback) {
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487 | var wrappedRequest = wrappedProtocol.request(input, options, callback);
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488 | wrappedRequest.end();
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489 | return wrappedRequest;
|
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490 | }
|
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491 |
|
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492 | // Expose the properties on the wrapped protocol
|
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493 | Object.defineProperties(wrappedProtocol, {
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494 | request: { value: request, configurable: true, enumerable: true, writable: true },
|
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495 | get: { value: get, configurable: true, enumerable: true, writable: true },
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496 | });
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497 | });
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498 | return exports;
|
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499 | }
|
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500 |
|
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501 | /* istanbul ignore next */
|
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502 | function noop() { /* empty */ }
|
---|
503 |
|
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504 | // from https://github.com/nodejs/node/blob/master/lib/internal/url.js
|
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505 | function urlToOptions(urlObject) {
|
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506 | var options = {
|
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507 | protocol: urlObject.protocol,
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508 | hostname: urlObject.hostname.startsWith("[") ?
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509 | /* istanbul ignore next */
|
---|
510 | urlObject.hostname.slice(1, -1) :
|
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511 | urlObject.hostname,
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512 | hash: urlObject.hash,
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513 | search: urlObject.search,
|
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514 | pathname: urlObject.pathname,
|
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515 | path: urlObject.pathname + urlObject.search,
|
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516 | href: urlObject.href,
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517 | };
|
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518 | if (urlObject.port !== "") {
|
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519 | options.port = Number(urlObject.port);
|
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520 | }
|
---|
521 | return options;
|
---|
522 | }
|
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523 |
|
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524 | function removeMatchingHeaders(regex, headers) {
|
---|
525 | var lastValue;
|
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526 | for (var header in headers) {
|
---|
527 | if (regex.test(header)) {
|
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528 | lastValue = headers[header].toString().trim();
|
---|
529 | delete headers[header];
|
---|
530 | }
|
---|
531 | }
|
---|
532 | return lastValue;
|
---|
533 | }
|
---|
534 |
|
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535 | function createErrorType(code, defaultMessage) {
|
---|
536 | function CustomError(cause) {
|
---|
537 | Error.captureStackTrace(this, this.constructor);
|
---|
538 | if (!cause) {
|
---|
539 | this.message = defaultMessage;
|
---|
540 | }
|
---|
541 | else {
|
---|
542 | this.message = defaultMessage + ": " + cause.message;
|
---|
543 | this.cause = cause;
|
---|
544 | }
|
---|
545 | }
|
---|
546 | CustomError.prototype = new Error();
|
---|
547 | CustomError.prototype.constructor = CustomError;
|
---|
548 | CustomError.prototype.name = "Error [" + code + "]";
|
---|
549 | CustomError.prototype.code = code;
|
---|
550 | return CustomError;
|
---|
551 | }
|
---|
552 |
|
---|
553 | function abortRequest(request) {
|
---|
554 | for (var e = 0; e < events.length; e++) {
|
---|
555 | request.removeListener(events[e], eventHandlers[events[e]]);
|
---|
556 | }
|
---|
557 | request.on("error", noop);
|
---|
558 | request.abort();
|
---|
559 | }
|
---|
560 |
|
---|
561 | function isSubdomainOf(subdomain, domain) {
|
---|
562 | const dot = subdomain.length - domain.length - 1;
|
---|
563 | return dot > 0 && subdomain[dot] === "." && subdomain.endsWith(domain);
|
---|
564 | }
|
---|
565 |
|
---|
566 | // Exports
|
---|
567 | module.exports = wrap({ http: http, https: https });
|
---|
568 | module.exports.wrap = wrap;
|
---|