Feeds.jsm
/* 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/. */
"use strict";
this.EXPORTED_SYMBOLS = [ "Feeds" ];
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
Components.utils.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
"resource://gre/modules/BrowserUtils.jsm");
const Ci = Components.interfaces;
this.Feeds = {
/**
* isValidFeed: checks whether the given data represents a valid feed.
*
* @param aLink
* An object representing a feed with title, href and type.
* @param aPrincipal
* The principal of the document, used for security check.
* @param aIsFeed
* Whether this is already a known feed or not, if true only a security
* check will be performed.
*/
isValidFeed: function(aLink, aPrincipal, aIsFeed) {
if (!aLink || !aPrincipal)
return false;
var type = aLink.type.toLowerCase().replace(/^\s+|\s*(?:;.*)?$/g, "");
if (!aIsFeed) {
aIsFeed = (type == "application/rss+xml" ||
type == "application/atom+xml");
}
if (aIsFeed) {
// re-create the principal as it may be a CPOW.
let principalURI = BrowserUtils.makeURIFromCPOW(aPrincipal.URI);
let principalToCheck = Services.scriptSecurityManager.getNoAppCodebasePrincipal(principalURI);
try {
BrowserUtils.urlSecurityCheck(aLink.href, principalToCheck,
Ci.nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL);
return type || "application/rss+xml";
}
catch(ex) {
}
}
return null;
},
};