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@@ -1,620 +0,0 @@ |
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/** |
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* Wrapper for built-in http.js to emulate the browser XMLHttpRequest object. |
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* |
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* This can be used with JS designed for browsers to improve reuse of code and |
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* allow the use of existing libraries. |
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* |
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* Usage: include("XMLHttpRequest.js") and use XMLHttpRequest per W3C specs. |
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* |
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* @author Dan DeFelippi <dan@driverdan.com> |
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* @contributor David Ellis <d.f.ellis@ieee.org> |
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* @license MIT |
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*/ |
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var Url = require("url"); |
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var spawn = require("child_process").spawn; |
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var fs = require("fs"); |
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exports.XMLHttpRequest = function() { |
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"use strict"; |
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/** |
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* Private variables |
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*/ |
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var self = this; |
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var http = require("http"); |
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var https = require("https"); |
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// Holds http.js objects |
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var request; |
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var response; |
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// Request settings |
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var settings = {}; |
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// Disable header blacklist. |
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// Not part of XHR specs. |
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var disableHeaderCheck = false; |
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// Set some default headers |
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var defaultHeaders = { |
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"User-Agent": "node-XMLHttpRequest", |
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"Accept": "*/*", |
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}; |
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var headers = {}; |
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var headersCase = {}; |
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// These headers are not user setable. |
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// The following are allowed but banned in the spec: |
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// * user-agent |
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var forbiddenRequestHeaders = [ |
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"accept-charset", |
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"accept-encoding", |
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"access-control-request-headers", |
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"access-control-request-method", |
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"connection", |
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"content-length", |
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"content-transfer-encoding", |
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"cookie", |
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"cookie2", |
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"date", |
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"expect", |
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"host", |
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"keep-alive", |
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"origin", |
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"referer", |
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"te", |
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"trailer", |
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"transfer-encoding", |
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"upgrade", |
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"via" |
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]; |
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// These request methods are not allowed |
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var forbiddenRequestMethods = [ |
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"TRACE", |
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"TRACK", |
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"CONNECT" |
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]; |
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// Send flag |
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var sendFlag = false; |
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// Error flag, used when errors occur or abort is called |
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var errorFlag = false; |
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// Event listeners |
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var listeners = {}; |
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/** |
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* Constants |
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*/ |
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this.UNSENT = 0; |
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this.OPENED = 1; |
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this.HEADERS_RECEIVED = 2; |
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this.LOADING = 3; |
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this.DONE = 4; |
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/** |
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* Public vars |
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*/ |
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// Current state |
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this.readyState = this.UNSENT; |
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// default ready state change handler in case one is not set or is set late |
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this.onreadystatechange = null; |
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// Result & response |
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this.responseText = ""; |
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this.responseXML = ""; |
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this.status = null; |
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this.statusText = null; |
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// Whether cross-site Access-Control requests should be made using |
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// credentials such as cookies or authorization headers |
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this.withCredentials = false; |
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/** |
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* Private methods |
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*/ |
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/** |
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* Check if the specified header is allowed. |
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* |
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* @param string header Header to validate |
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* @return boolean False if not allowed, otherwise true |
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*/ |
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var isAllowedHttpHeader = function(header) { |
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return disableHeaderCheck || (header && forbiddenRequestHeaders.indexOf(header.toLowerCase()) === -1); |
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}; |
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/** |
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* Check if the specified method is allowed. |
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* |
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* @param string method Request method to validate |
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* @return boolean False if not allowed, otherwise true |
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*/ |
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var isAllowedHttpMethod = function(method) { |
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return (method && forbiddenRequestMethods.indexOf(method) === -1); |
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}; |
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/** |
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* Public methods |
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*/ |
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/** |
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* Open the connection. Currently supports local server requests. |
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* |
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* @param string method Connection method (eg GET, POST) |
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* @param string url URL for the connection. |
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* @param boolean async Asynchronous connection. Default is true. |
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* @param string user Username for basic authentication (optional) |
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* @param string password Password for basic authentication (optional) |
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*/ |
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this.open = function(method, url, async, user, password) { |
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this.abort(); |
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errorFlag = false; |
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// Check for valid request method |
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if (!isAllowedHttpMethod(method)) { |
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throw new Error("SecurityError: Request method not allowed"); |
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} |
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settings = { |
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"method": method, |
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"url": url.toString(), |
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"async": (typeof async !== "boolean" ? true : async), |
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"user": user || null, |
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"password": password || null |
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}; |
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setState(this.OPENED); |
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}; |
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/** |
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* Disables or enables isAllowedHttpHeader() check the request. Enabled by default. |
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* This does not conform to the W3C spec. |
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* |
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* @param boolean state Enable or disable header checking. |
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*/ |
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this.setDisableHeaderCheck = function(state) { |
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disableHeaderCheck = state; |
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}; |
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/** |
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* Sets a header for the request or appends the value if one is already set. |
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* |
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* @param string header Header name |
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* @param string value Header value |
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*/ |
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this.setRequestHeader = function(header, value) { |
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if (this.readyState !== this.OPENED) { |
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throw new Error("INVALID_STATE_ERR: setRequestHeader can only be called when state is OPEN"); |
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} |
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if (!isAllowedHttpHeader(header)) { |
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console.warn("Refused to set unsafe header \"" + header + "\""); |
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return; |
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} |
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if (sendFlag) { |
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throw new Error("INVALID_STATE_ERR: send flag is true"); |
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} |
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header = headersCase[header.toLowerCase()] || header; |
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headersCase[header.toLowerCase()] = header; |
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headers[header] = headers[header] ? headers[header] + ', ' + value : value; |
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}; |
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/** |
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* Gets a header from the server response. |
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* |
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* @param string header Name of header to get. |
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* @return string Text of the header or null if it doesn't exist. |
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*/ |
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this.getResponseHeader = function(header) { |
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if (typeof header === "string" |
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&& this.readyState > this.OPENED |
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&& response |
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&& response.headers |
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&& response.headers[header.toLowerCase()] |
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&& !errorFlag |
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) { |
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return response.headers[header.toLowerCase()]; |
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} |
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return null; |
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}; |
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/** |
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* Gets all the response headers. |
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* |
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* @return string A string with all response headers separated by CR+LF |
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*/ |
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this.getAllResponseHeaders = function() { |
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if (this.readyState < this.HEADERS_RECEIVED || errorFlag) { |
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return ""; |
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} |
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var result = ""; |
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for (var i in response.headers) { |
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// Cookie headers are excluded |
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if (i !== "set-cookie" && i !== "set-cookie2") { |
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result += i + ": " + response.headers[i] + "\r\n"; |
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} |
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} |
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return result.substr(0, result.length - 2); |
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}; |
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/** |
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* Gets a request header |
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* |
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* @param string name Name of header to get |
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* @return string Returns the request header or empty string if not set |
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*/ |
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this.getRequestHeader = function(name) { |
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if (typeof name === "string" && headersCase[name.toLowerCase()]) { |
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return headers[headersCase[name.toLowerCase()]]; |
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} |
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return ""; |
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}; |
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/** |
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* Sends the request to the server. |
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* |
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* @param string data Optional data to send as request body. |
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*/ |
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this.send = function(data) { |
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if (this.readyState !== this.OPENED) { |
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throw new Error("INVALID_STATE_ERR: connection must be opened before send() is called"); |
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} |
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if (sendFlag) { |
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throw new Error("INVALID_STATE_ERR: send has already been called"); |
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} |
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var ssl = false, local = false; |
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var url = Url.parse(settings.url); |
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var host; |
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// Determine the server |
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switch (url.protocol) { |
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case "https:": |
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ssl = true; |
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// SSL & non-SSL both need host, no break here. |
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case "http:": |
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host = url.hostname; |
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break; |
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case "file:": |
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local = true; |
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break; |
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case undefined: |
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case null: |
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case "": |
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host = "localhost"; |
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break; |
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default: |
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throw new Error("Protocol not supported."); |
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} |
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// Load files off the local filesystem (file://) |
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if (local) { |
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if (settings.method !== "GET") { |
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throw new Error("XMLHttpRequest: Only GET method is supported"); |
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} |
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if (settings.async) { |
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fs.readFile(url.pathname, "utf8", function(error, data) { |
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if (error) { |
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self.handleError(error); |
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} else { |
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self.status = 200; |
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self.responseText = data; |
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setState(self.DONE); |
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} |
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}); |
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} else { |
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try { |
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this.responseText = fs.readFileSync(url.pathname, "utf8"); |
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this.status = 200; |
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setState(self.DONE); |
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} catch(e) { |
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this.handleError(e); |
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} |
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} |
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return; |
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} |
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// Default to port 80. If accessing localhost on another port be sure |
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// to use http://localhost:port/path |
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var port = url.port || (ssl ? 443 : 80); |
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// Add query string if one is used |
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var uri = url.pathname + (url.search ? url.search : ""); |
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// Set the defaults if they haven't been set |
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for (var name in defaultHeaders) { |
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if (!headersCase[name.toLowerCase()]) { |
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headers[name] = defaultHeaders[name]; |
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} |
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} |
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// Set the Host header or the server may reject the request |
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headers.Host = host; |
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if (!((ssl && port === 443) || port === 80)) { |
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headers.Host += ":" + url.port; |
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} |
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// Set Basic Auth if necessary |
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if (settings.user) { |
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if (typeof settings.password === "undefined") { |
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settings.password = ""; |
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} |
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var authBuf = new Buffer(settings.user + ":" + settings.password); |
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headers.Authorization = "Basic " + authBuf.toString("base64"); |
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} |
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// Set content length header |
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if (settings.method === "GET" || settings.method === "HEAD") { |
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data = null; |
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} else if (data) { |
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headers["Content-Length"] = Buffer.isBuffer(data) ? data.length : Buffer.byteLength(data); |
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if (!headers["Content-Type"]) { |
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headers["Content-Type"] = "text/plain;charset=UTF-8"; |
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} |
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} else if (settings.method === "POST") { |
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// For a post with no data set Content-Length: 0. |
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// This is required by buggy servers that don't meet the specs. |
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headers["Content-Length"] = 0; |
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} |
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var options = { |
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host: host, |
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port: port, |
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path: uri, |
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method: settings.method, |
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headers: headers, |
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agent: false, |
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withCredentials: self.withCredentials |
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}; |
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// Reset error flag |
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errorFlag = false; |
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// Handle async requests |
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if (settings.async) { |
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// Use the proper protocol |
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var doRequest = ssl ? https.request : http.request; |
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// Request is being sent, set send flag |
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sendFlag = true; |
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// As per spec, this is called here for historical reasons. |
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self.dispatchEvent("readystatechange"); |
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// Handler for the response |
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var responseHandler = function responseHandler(resp) { |
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// Set response var to the response we got back |
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// This is so it remains accessable outside this scope |
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response = resp; |
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// Check for redirect |
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// @TODO Prevent looped redirects |
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if (response.statusCode === 301 || response.statusCode === 302 || response.statusCode === 303 || response.statusCode === 307) { |
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// Change URL to the redirect location |
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settings.url = response.headers.location; |
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var url = Url.parse(settings.url); |
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// Set host var in case it's used later |
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host = url.hostname; |
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// Options for the new request |
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var newOptions = { |
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hostname: url.hostname, |
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port: url.port, |
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path: url.path, |
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method: response.statusCode === 303 ? "GET" : settings.method, |
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headers: headers, |
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withCredentials: self.withCredentials |
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}; |
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// Issue the new request |
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request = doRequest(newOptions, responseHandler).on("error", errorHandler); |
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request.end(); |
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// @TODO Check if an XHR event needs to be fired here |
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return; |
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} |
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response.setEncoding("utf8"); |
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setState(self.HEADERS_RECEIVED); |
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self.status = response.statusCode; |
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response.on("data", function(chunk) { |
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// Make sure there's some data |
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if (chunk) { |
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self.responseText += chunk; |
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} |
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// Don't emit state changes if the connection has been aborted. |
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if (sendFlag) { |
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setState(self.LOADING); |
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} |
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}); |
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response.on("end", function() { |
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if (sendFlag) { |
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// Discard the end event if the connection has been aborted |
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setState(self.DONE); |
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sendFlag = false; |
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} |
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}); |
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response.on("error", function(error) { |
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self.handleError(error); |
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}); |
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|
}; |
|
|
|
|
|
|
|
// Error handler for the request |
|
|
|
var errorHandler = 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 + "', JSON.stringify({err: null, data: {statusCode: response.statusCode, headers: response.headers, text: responseText}}), 'utf8');" |
|
|
|
+ "fs.unlinkSync('" + syncFile + "');" |
|
|
|
+ "});" |
|
|
|
+ "response.on('error', function(error) {" |
|
|
|
+ "fs.writeFileSync('" + contentFile + "', JSON.stringify({err: error}), 'utf8');" |
|
|
|
+ "fs.unlinkSync('" + syncFile + "');" |
|
|
|
+ "});" |
|
|
|
+ "}).on('error', function(error) {" |
|
|
|
+ "fs.writeFileSync('" + contentFile + "', JSON.stringify({err: error}), 'utf8');" |
|
|
|
+ "fs.unlinkSync('" + syncFile + "');" |
|
|
|
+ "});" |
|
|
|
+ (data ? "req.write('" + JSON.stringify(data).slice(1,-1).replace(/'/g, "\\'") + "');":"") |
|
|
|
+ "req.end();"; |
|
|
|
// Start the other Node Process, executing this string |
|
|
|
var syncProc = spawn(process.argv[0], ["-e", execString]); |
|
|
|
while(fs.existsSync(syncFile)) { |
|
|
|
// Wait while the sync file is empty |
|
|
|
} |
|
|
|
var resp = JSON.parse(fs.readFileSync(contentFile, 'utf8')); |
|
|
|
// Kill the child process once the file has data |
|
|
|
syncProc.stdin.end(); |
|
|
|
// Remove the temporary file |
|
|
|
fs.unlinkSync(contentFile); |
|
|
|
|
|
|
|
if (resp.err) { |
|
|
|
self.handleError(resp.err); |
|
|
|
} else { |
|
|
|
response = resp.data; |
|
|
|
self.status = resp.data.statusCode; |
|
|
|
self.responseText = resp.data.text; |
|
|
|
setState(self.DONE); |
|
|
|
} |
|
|
|
} |
|
|
|
}; |
|
|
|
|
|
|
|
/** |
|
|
|
* Called when an error is encountered to deal with it. |
|
|
|
*/ |
|
|
|
this.handleError = function(error) { |
|
|
|
this.status = 0; |
|
|
|
this.statusText = error; |
|
|
|
this.responseText = error.stack; |
|
|
|
errorFlag = true; |
|
|
|
setState(this.DONE); |
|
|
|
this.dispatchEvent('error'); |
|
|
|
}; |
|
|
|
|
|
|
|
/** |
|
|
|
* Aborts a request. |
|
|
|
*/ |
|
|
|
this.abort = function() { |
|
|
|
if (request) { |
|
|
|
request.abort(); |
|
|
|
request = null; |
|
|
|
} |
|
|
|
|
|
|
|
headers = defaultHeaders; |
|
|
|
this.status = 0; |
|
|
|
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; |
|
|
|
this.dispatchEvent('abort'); |
|
|
|
}; |
|
|
|
|
|
|
|
/** |
|
|
|
* 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 (state == self.LOADING || 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"); |
|
|
|
} |
|
|
|
} |
|
|
|
}; |
|
|
|
}; |