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shrine-medco/shrine-webclient/src/main/html/node_modules/xmlhttprequest-ssl/lib/XMLHttpRequest.js
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XMLHttpRequest.js
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			/**
			* Wrapper for built-in http.js to emulate the browser XMLHttpRequest object.
			*
			* This can be used with JS designed for browsers to improve reuse of code and
			* allow the use of existing libraries.
			*
			* Usage: include("XMLHttpRequest.js") and use XMLHttpRequest per W3C specs.
			*
			* @author Dan DeFelippi <dan@driverdan.com>
			* @contributor David Ellis <d.f.ellis@ieee.org>
			* @license MIT
			*/

			var fs = require('fs');
			var Url = require('url');
			var spawn = require('child_process').spawn;

			/**
			* Module exports.
			*/

			module.exports = XMLHttpRequest;

			// backwards-compat
			XMLHttpRequest.XMLHttpRequest = XMLHttpRequest;

			/**
			* `XMLHttpRequest` constructor.
			*
			* Supported options for the `opts` object are:
			*
			* - `agent`: An http.Agent instance; http.globalAgent may be used; if 'undefined', agent usage is disabled
			*
			* @param {Object} opts optional "options" object
			*/

			function XMLHttpRequest(opts) {
			/**
			* Private variables
			*/
			var self = this;
			var http = require('http');
			var https = require('https');

			// Holds http.js objects
			var request;
			var response;

			// Request settings
			var settings = {};

			// Disable header blacklist.
			// Not part of XHR specs.
			var disableHeaderCheck = false;

			// Set some default headers
			var defaultHeaders = {
			"User-Agent": "node-XMLHttpRequest",
			"Accept": "/"
			};

			var headers = defaultHeaders;

			// These headers are not user setable.
			// The following are allowed but banned in the spec:
			// * user-agent
			var forbiddenRequestHeaders = [
			"accept-charset",
			"accept-encoding",
			"access-control-request-headers",
			"access-control-request-method",
			"connection",
			"content-length",
			"content-transfer-encoding",
			"cookie",
			"cookie2",
			"date",
			"expect",
			"host",
			"keep-alive",
			"origin",
			"referer",
			"te",
			"trailer",
			"transfer-encoding",
			"upgrade",
			"via"
			];

			// These request methods are not allowed
			var forbiddenRequestMethods = [
			"TRACE",
			"TRACK",
			"CONNECT"
			];

			// Send flag
			var sendFlag = false;
			// Error flag, used when errors occur or abort is called
			var errorFlag = false;

			// Event listeners
			var listeners = {};

			/**
			* Constants
			*/

			this.UNSENT = 0;
			this.OPENED = 1;
			this.HEADERS_RECEIVED = 2;
			this.LOADING = 3;
			this.DONE = 4;

			/**
			* Public vars
			*/

			// Current state
			this.readyState = this.UNSENT;

			// default ready state change handler in case one is not set or is set late
			this.onreadystatechange = null;

			// Result & response
			this.responseText = "";
			this.responseXML = "";
			this.status = null;
			this.statusText = null;

			/**
			* Private methods
			*/

			/**
			* Check if the specified header is allowed.
			*
			* @param string header Header to validate
			* @return boolean False if not allowed, otherwise true
			*/
			var isAllowedHttpHeader = function(header) {
			return disableHeaderCheck \|\| (header && forbiddenRequestHeaders.indexOf(header.toLowerCase()) === -1);
			};

			/**
			* Check if the specified method is allowed.
			*
			* @param string method Request method to validate
			* @return boolean False if not allowed, otherwise true
			*/
			var isAllowedHttpMethod = function(method) {
			return (method && forbiddenRequestMethods.indexOf(method) === -1);
			};

			/**
			* Public methods
			*/

			/**
			* Open the connection. Currently supports local server requests.
			*
			* @param string method Connection method (eg GET, POST)
			* @param string url URL for the connection.
			* @param boolean async Asynchronous connection. Default is true.
			* @param string user Username for basic authentication (optional)
			* @param string password Password for basic authentication (optional)
			*/
			this.open = function(method, url, async, user, password) {
			this.abort();
			errorFlag = false;

			// Check for valid request method
			if (!isAllowedHttpMethod(method)) {
			throw "SecurityError: Request method not allowed";
			}

			settings = {
			"method": method,
			"url": url.toString(),
			"async": (typeof async !== "boolean" ? true : async),
			"user": user \|\| null,
			"password": password \|\| null
			};

			setState(this.OPENED);
			};

			/**
			* Disables or enables isAllowedHttpHeader() check the request. Enabled by default.
			* This does not conform to the W3C spec.
			*
			* @param boolean state Enable or disable header checking.
			*/
			this.setDisableHeaderCheck = function(state) {
			disableHeaderCheck = state;
			};

			/**
			* Sets a header for the request.
			*
			* @param string header Header name
			* @param string value Header value
			* @return boolean Header added
			*/
			this.setRequestHeader = function(header, value) {
			if (this.readyState != this.OPENED) {
			throw "INVALID_STATE_ERR: setRequestHeader can only be called when state is OPEN";
			return false;
			}
			if (!isAllowedHttpHeader(header)) {
			console.warn('Refused to set unsafe header "' + header + '"');
			return false;
			}
			if (sendFlag) {
			throw "INVALID_STATE_ERR: send flag is true";
			return false;
			}
			headers[header] = value;
			return true;
			};

			/**
			* Gets a header from the server response.
			*
			* @param string header Name of header to get.
			* @return string Text of the header or null if it doesn't exist.
			*/
			this.getResponseHeader = function(header) {
			if (typeof header === "string"
			&& this.readyState > this.OPENED
			&& response.headers[header.toLowerCase()]
			&& !errorFlag
			) {
			return response.headers[header.toLowerCase()];
			}

			return null;
			};

			/**
			* Gets all the response headers.
			*
			* @return string A string with all response headers separated by CR+LF
			*/
			this.getAllResponseHeaders = function() {
			if (this.readyState < this.HEADERS_RECEIVED \|\| errorFlag) {
			return "";
			}
			var result = "";

			for (var i in response.headers) {
			// Cookie headers are excluded
			if (i !== "set-cookie" && i !== "set-cookie2") {
			result += i + ": " + response.headers[i] + "\r\n";
			}
			}
			return result.substr(0, result.length - 2);
			};

			/**
			* Gets a request header
			*
			* @param string name Name of header to get
			* @return string Returns the request header or empty string if not set
			*/
			this.getRequestHeader = function(name) {
			// @TODO Make this case insensitive
			if (typeof name === "string" && headers[name]) {
			return headers[name];
			}

			return "";
			};

			/**
			* Sends the request to the server.
			*
			* @param string data Optional data to send as request body.
			*/
			this.send = function(data) {
			if (this.readyState != this.OPENED) {
			throw "INVALID_STATE_ERR: connection must be opened before send() is called";
			}

			if (sendFlag) {
			throw "INVALID_STATE_ERR: send has already been called";
			}

			var ssl = false, local = false;
			var url = Url.parse(settings.url);
			var host;
			// Determine the server
			switch (url.protocol) {
			case 'https:':
			ssl = true;
			// SSL & non-SSL both need host, no break here.
			case 'http:':
			host = url.hostname;
			break;

			case 'file:':
			local = true;
			break;

			case undefined:
			case '':
			host = "localhost";
			break;

			default:
			throw "Protocol not supported.";
			}

			// Load files off the local filesystem (file://)
			if (local) {
			if (settings.method !== "GET") {
			throw "XMLHttpRequest: Only GET method is supported";
			}

			if (settings.async) {
			fs.readFile(url.pathname, 'utf8', function(error, data) {
			if (error) {
			self.handleError(error);
			} else {
			self.status = 200;
			self.responseText = data;
			setState(self.DONE);
			}
			});
			} else {
			try {
			this.responseText = fs.readFileSync(url.pathname, 'utf8');
			this.status = 200;
			setState(self.DONE);
			} catch(e) {
			this.handleError(e);
			}
			}

			return;
			}

			// Default to port 80. If accessing localhost on another port be sure
			// to use http://localhost:port/path
			var port = url.port \|\| (ssl ? 443 : 80);
			// Add query string if one is used
			var uri = url.pathname + (url.search ? url.search : '');

			// Set the Host header or the server may reject the request
			headers["Host"] = host;
			if (!((ssl && port === 443) \|\| port === 80)) {
			headers["Host"] += ':' + url.port;
			}

			// Set Basic Auth if necessary
			if (settings.user) {
			if (typeof settings.password == "undefined") {
			settings.password = "";
			}
			var authBuf = new Buffer(settings.user + ":" + settings.password);
			headers["Authorization"] = "Basic " + authBuf.toString("base64");
			}

			// Set content length header
			if (settings.method === "GET" \|\| settings.method === "HEAD") {
			data = null;
			} else if (data) {
			headers["Content-Length"] = Buffer.isBuffer(data) ? data.length : Buffer.byteLength(data);

			if (!headers["Content-Type"]) {
			headers["Content-Type"] = "text/plain;charset=UTF-8";
			}
			} else if (settings.method === "POST") {
			// For a post with no data set Content-Length: 0.
			// This is required by buggy servers that don't meet the specs.
			headers["Content-Length"] = 0;
			}

			var agent = false;
			if (opts && opts.agent) {
			agent = opts.agent;
			}
			var options = {
			host: host,
			port: port,
			path: uri,
			method: settings.method,
			headers: headers,
			agent: agent
			};

			if (ssl) {
			options.pfx = opts.pfx;
			options.key = opts.key;
			options.passphrase = opts.passphrase;
			options.cert = opts.cert;
			options.ca = opts.ca;
			options.ciphers = opts.ciphers;
			options.rejectUnauthorized = opts.rejectUnauthorized;
			}

			// Reset error flag
			errorFlag = false;

			// Handle async requests
			if (settings.async) {
			// Use the proper protocol
			var doRequest = ssl ? https.request : http.request;

			// Request is being sent, set send flag
			sendFlag = true;

			// As per spec, this is called here for historical reasons.
			self.dispatchEvent("readystatechange");

			// Handler for the response
			function responseHandler(resp) {
			// Set response var to the response we got back
			// This is so it remains accessable outside this scope
			response = resp;
			// Check for redirect
			// @TODO Prevent looped redirects
			if (response.statusCode === 302 \|\| response.statusCode === 303 \|\| response.statusCode === 307) {
			// Change URL to the redirect location
			settings.url = response.headers.location;
			var url = Url.parse(settings.url);
			// Set host var in case it's used later
			host = url.hostname;
			// Options for the new request
			var newOptions = {
			hostname: url.hostname,
			port: url.port,
			path: url.path,
			method: response.statusCode === 303 ? 'GET' : settings.method,
			headers: headers
			};

			if (ssl) {
			options.pfx = opts.pfx;
			options.key = opts.key;
			options.passphrase = opts.passphrase;
			options.cert = opts.cert;
			options.ca = opts.ca;
			options.ciphers = opts.ciphers;
			options.rejectUnauthorized = opts.rejectUnauthorized;
			}

			// Issue the new request
			request = doRequest(newOptions, responseHandler).on('error', errorHandler);
			request.end();
			// @TODO Check if an XHR event needs to be fired here
			return;
			}

			response.setEncoding("utf8");

			setState(self.HEADERS_RECEIVED);
			self.status = response.statusCode;

			response.on('data', function(chunk) {
			// Make sure there's some data
			if (chunk) {
			self.responseText += chunk;
			}
			// Don't emit state changes if the connection has been aborted.
			if (sendFlag) {
			setState(self.LOADING);
			}
			});

			response.on('end', function() {
			if (sendFlag) {
			// Discard the 'end' event if the connection has been aborted
			setState(self.DONE);
			sendFlag = false;
			}
			});

			response.on('error', function(error) {
			self.handleError(error);
			});
			}

			// Error handler for the request
			function errorHandler(error) {
			self.handleError(error);
			}

			// Create the request
			request = doRequest(options, responseHandler).on('error', errorHandler);

			// Node 0.4 and later won't accept empty data. Make sure it's needed.
			if (data) {
			request.write(data);
			}

			request.end();

			self.dispatchEvent("loadstart");
			} else { // Synchronous
			// Create a temporary file for communication with the other Node process
			var contentFile = ".node-xmlhttprequest-content-" + process.pid;
			var syncFile = ".node-xmlhttprequest-sync-" + process.pid;
			fs.writeFileSync(syncFile, "", "utf8");
			// The async request the other Node process executes
			var execString = "var http = require('http'), https = require('https'), fs = require('fs');"
			+ "var doRequest = http" + (ssl ? "s" : "") + ".request;"
			+ "var options = " + JSON.stringify(options) + ";"
			+ "var responseText = '';"
			+ "var req = doRequest(options, function(response) {"
			+ "response.setEncoding('utf8');"
			+ "response.on('data', function(chunk) {"
			+ " responseText += chunk;"
			+ "});"
			+ "response.on('end', function() {"
			+ "fs.writeFileSync('" + contentFile + "', 'NODE-XMLHTTPREQUEST-STATUS:' + response.statusCode + ',' + responseText, 'utf8');"
			+ "fs.unlinkSync('" + syncFile + "');"
			+ "});"
			+ "response.on('error', function(error) {"
			+ "fs.writeFileSync('" + contentFile + "', 'NODE-XMLHTTPREQUEST-ERROR:' + JSON.stringify(error), 'utf8');"
			+ "fs.unlinkSync('" + syncFile + "');"
			+ "});"
			+ "}).on('error', function(error) {"
			+ "fs.writeFileSync('" + contentFile + "', 'NODE-XMLHTTPREQUEST-ERROR:' + JSON.stringify(error), 'utf8');"
			+ "fs.unlinkSync('" + syncFile + "');"
			+ "});"
			+ (data ? "req.write('" + data.replace(/'/g, "\\'") + "');":"")
			+ "req.end();";
			// Start the other Node Process, executing this string
			var syncProc = spawn(process.argv[0], ["-e", execString]);
			var statusText;
			while(fs.existsSync(syncFile)) {
			// Wait while the sync file is empty
			}
			self.responseText = fs.readFileSync(contentFile, 'utf8');
			// Kill the child process once the file has data
			syncProc.stdin.end();
			// Remove the temporary file
			fs.unlinkSync(contentFile);
			if (self.responseText.match(/^NODE-XMLHTTPREQUEST-ERROR:/)) {
			// If the file returned an error, handle it
			var errorObj = self.responseText.replace(/^NODE-XMLHTTPREQUEST-ERROR:/, "");
			self.handleError(errorObj);
			} else {
			// If the file returned okay, parse its data and move to the DONE state
			self.status = self.responseText.replace(/^NODE-XMLHTTPREQUEST-STATUS:([0-9]),./, "$1");
			self.responseText = self.responseText.replace(/^NODE-XMLHTTPREQUEST-STATUS:[0-9],(.)/, "$1");
			setState(self.DONE);
			}
			}
			};

			/**
			* Called when an error is encountered to deal with it.
			*/
			this.handleError = function(error) {
			this.status = 503;
			this.statusText = error;
			this.responseText = error.stack;
			errorFlag = true;
			setState(this.DONE);
			};

			/**
			* Aborts a request.
			*/
			this.abort = function() {
			if (request) {
			request.abort();
			request = null;
			}

			headers = defaultHeaders;
			this.responseText = "";
			this.responseXML = "";

			errorFlag = true;

			if (this.readyState !== this.UNSENT
			&& (this.readyState !== this.OPENED \|\| sendFlag)
			&& this.readyState !== this.DONE) {
			sendFlag = false;
			setState(this.DONE);
			}
			this.readyState = this.UNSENT;
			};

			/**
			* Adds an event listener. Preferred method of binding to events.
			*/
			this.addEventListener = function(event, callback) {
			if (!(event in listeners)) {
			listeners[event] = [];
			}
			// Currently allows duplicate callbacks. Should it?
			listeners[event].push(callback);
			};

			/**
			* Remove an event callback that has already been bound.
			* Only works on the matching funciton, cannot be a copy.
			*/
			this.removeEventListener = function(event, callback) {
			if (event in listeners) {
			// Filter will return a new array with the callback removed
			listeners[event] = listeners[event].filter(function(ev) {
			return ev !== callback;
			});
			}
			};

			/**
			* Dispatch any events, including both "on" methods and events attached using addEventListener.
			*/
			this.dispatchEvent = function(event) {
			if (typeof self["on" + event] === "function") {
			self["on" + event]();
			}
			if (event in listeners) {
			for (var i = 0, len = listeners[event].length; i < len; i++) {
			listeners[event][i].call(self);
			}
			}
			};

			/**
			* Changes readyState and calls onreadystatechange.
			*
			* @param int state New state
			*/
			var setState = function(state) {
			if (self.readyState !== state) {
			self.readyState = state;

			if (settings.async \|\| self.readyState < self.OPENED \|\| self.readyState === self.DONE) {
			self.dispatchEvent("readystatechange");
			}

			if (self.readyState === self.DONE && !errorFlag) {
			self.dispatchEvent("load");
			// @TODO figure out InspectorInstrumentation::didLoadXHR(cookie)
			self.dispatchEvent("loadend");
			}
			}
			};
			};