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123 lines
3.9 KiB
JavaScript
123 lines
3.9 KiB
JavaScript
# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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// A simple class that encapsulates a request. You'll notice the
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// style here is different from the rest of the extension; that's
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// because this was re-used from really old code we had. At some
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// point it might be nice to replace this with something better
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// (e.g., something that has explicit onerror handler, ability
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// to set headers, and so on).
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/**
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* Because we might be in a component, we can't just assume that
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* XMLHttpRequest exists. So we use this tiny factory function to wrap the
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* XPCOM version.
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*
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* @return XMLHttpRequest object
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*/
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function PROT_NewXMLHttpRequest() {
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var Cc = Components.classes;
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var Ci = Components.interfaces;
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var request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"]
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.createInstance(Ci.nsIXMLHttpRequest);
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// Need the following so we get onerror/load/progresschange
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request.QueryInterface(Ci.nsIJSXMLHttpRequest);
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return request;
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}
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/**
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* A helper class that does HTTP GETs and calls back a function with
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* the content it receives. Asynchronous, so uses a closure for the
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* callback.
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*
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* Note, that XMLFetcher is only used for SafeBrowsing, therefore
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* we inherit from nsILoadContext, so we can use the callbacks on the
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* channel to separate the safebrowsing cookie based on a reserved
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* appId.
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* @constructor
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*/
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function PROT_XMLFetcher() {
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this.debugZone = "xmlfetcher";
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this._request = PROT_NewXMLHttpRequest();
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// implements nsILoadContext
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this.appId = Ci.nsIScriptSecurityManager.SAFEBROWSING_APP_ID;
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this.isInBrowserElement = false;
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this.usePrivateBrowsing = false;
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this.isContent = false;
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}
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PROT_XMLFetcher.prototype = {
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/**
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* Function that will be called back upon fetch completion.
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*/
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_callback: null,
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/**
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* Fetches some content.
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*
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* @param page URL to fetch
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* @param callback Function to call back when complete.
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*/
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get: function(page, callback) {
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this._request.abort(); // abort() is asynchronous, so
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this._request = PROT_NewXMLHttpRequest();
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this._callback = callback;
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var asynchronous = true;
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this._request.open("GET", page, asynchronous);
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this._request.channel.notificationCallbacks = this;
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// Create a closure
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var self = this;
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this._request.addEventListener("readystatechange", function() {
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self.readyStateChange(self);
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}, false);
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this._request.send(null);
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},
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cancel: function() {
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this._request.abort();
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this._request = null;
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},
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/**
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* Called periodically by the request to indicate some state change. 4
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* means content has been received.
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*/
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readyStateChange: function(fetcher) {
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if (fetcher._request.readyState != 4)
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return;
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// If the request fails, on trunk we get status set to
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// NS_ERROR_NOT_AVAILABLE. On 1.8.1 branch we get an exception
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// forwarded from nsIHttpChannel::GetResponseStatus. To be consistent
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// between branch and trunk, we send back NS_ERROR_NOT_AVAILABLE for
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// http failures.
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var responseText = null;
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var status = Components.results.NS_ERROR_NOT_AVAILABLE;
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try {
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G_Debug(this, "xml fetch status code: \"" +
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fetcher._request.status + "\"");
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status = fetcher._request.status;
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responseText = fetcher._request.responseText;
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} catch(e) {
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G_Debug(this, "Caught exception trying to read xmlhttprequest " +
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"status/response.");
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G_Debug(this, e);
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}
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if (fetcher._callback)
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fetcher._callback(responseText, status);
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},
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// nsIInterfaceRequestor
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getInterface: function(iid) {
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return this.QueryInterface(iid);
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},
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIInterfaceRequestor,
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Ci.nsISupports,
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Ci.nsILoadContext])
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};
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