652 lines
18 KiB
JavaScript
652 lines
18 KiB
JavaScript
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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 fs = require('fs');
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var Url = require('url');
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var spawn = require('child_process').spawn;
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/**
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* Module exports.
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*/
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module.exports = XMLHttpRequest;
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// backwards-compat
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XMLHttpRequest.XMLHttpRequest = XMLHttpRequest;
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/**
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* `XMLHttpRequest` constructor.
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*
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* Supported options for the `opts` object are:
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*
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* - `agent`: An http.Agent instance; http.globalAgent may be used; if 'undefined', agent usage is disabled
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*
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* @param {Object} opts optional "options" object
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*/
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function XMLHttpRequest(opts) {
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"use strict";
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opts = opts || {};
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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 = Object.assign({}, defaultHeaders);
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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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/**
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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 "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.
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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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* @return boolean Header added
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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 "INVALID_STATE_ERR: setRequestHeader can only be called when state is OPEN";
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return false;
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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 false;
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}
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if (sendFlag) {
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throw "INVALID_STATE_ERR: send flag is true";
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return false;
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}
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headers[header] = value;
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return true;
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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.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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// @TODO Make this case insensitive
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if (typeof name === "string" && headers[name]) {
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return headers[name];
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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 "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 "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 '':
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host = "localhost";
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break;
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default:
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throw "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 "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 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 agent = opts.agent || false;
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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: agent
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};
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if (ssl) {
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options.pfx = opts.pfx;
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options.key = opts.key;
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options.passphrase = opts.passphrase;
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options.cert = opts.cert;
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options.ca = opts.ca;
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options.ciphers = opts.ciphers;
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options.rejectUnauthorized = opts.rejectUnauthorized;
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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(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;
|
||
|
|
// 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) {
|
||
|
|
newOptions.pfx = opts.pfx;
|
||
|
|
newOptions.key = opts.key;
|
||
|
|
newOptions.passphrase = opts.passphrase;
|
||
|
|
newOptions.cert = opts.cert;
|
||
|
|
newOptions.ca = opts.ca;
|
||
|
|
newOptions.ciphers = opts.ciphers;
|
||
|
|
newOptions.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;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (response && response.setEncoding) {
|
||
|
|
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) {
|
||
|
|
// The sendFlag needs to be set before setState is called. Otherwise if we are chaining callbacks
|
||
|
|
// there can be a timing issue (the callback is called and a new call is made before the flag is reset).
|
||
|
|
sendFlag = false;
|
||
|
|
// Discard the 'end' event if the connection has been aborted
|
||
|
|
setState(self.DONE);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
response.on('error', function(error) {
|
||
|
|
self.handleError(error);
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
// Error handler for the request
|
||
|
|
var errorHandler = function(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 = Object.assign({}, 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");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|