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