gecko/browser/components/tabview/content.js

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is content.js.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Tim Taubert <ttaubert@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
"use strict";
let Cu = Components.utils;
Cu.import("resource:///modules/tabview/utils.jsm");
// Bug 671101 - directly using webProgress in this context
// causes docShells to leak
__defineGetter__("webProgress", function () {
let ifaceReq = docShell.QueryInterface(Ci.nsIInterfaceRequestor);
return ifaceReq.getInterface(Ci.nsIWebProgress);
});
// ----------
// WindowEventHandler
//
// Handles events dispatched by the content window.
let WindowEventHandler = {
// ----------
// Function: onDOMContentLoaded
// Sends an asynchronous message when the "onDOMContentLoaded" event for the
// current page is fired.
onDOMContentLoaded: function WEH_onDOMContentLoaded(event) {
sendAsyncMessage("Panorama:DOMContentLoaded");
},
// ----------
// Function: onDOMWillOpenModalDialog
// Sends a synchronous message when the "onDOMWillOpenModalDialog" event
// is fired right before a modal dialog will be opened by the current page.
onDOMWillOpenModalDialog: function WEH_onDOMWillOpenModalDialog(event) {
// (event.isTrusted == true) when the event is generated by a user action
// and does not originate from a script.
if (!event.isTrusted)
return;
// we're intentionally sending a synchronous message to handle this event
// as quick as possible, switch the selected tab and hide the tabview
// before the modal dialog is shown
sendSyncMessage("Panorama:DOMWillOpenModalDialog");
}
};
// add event listeners
addEventListener("DOMContentLoaded", WindowEventHandler.onDOMContentLoaded, false);
addEventListener("DOMWillOpenModalDialog", WindowEventHandler.onDOMWillOpenModalDialog, false);
// ----------
// WindowMessageHandler
//
// Handles messages sent by the chrome process.
let WindowMessageHandler = {
// ----------
// Function: isDocumentLoaded
// Checks if the currently active document is loaded.
isDocumentLoaded: function WMH_isDocumentLoaded(cx) {
let isLoaded = (content.document.readyState == "complete" &&
!webProgress.isLoadingDocument);
sendAsyncMessage(cx.name, {isLoaded: isLoaded});
}
};
// add message listeners
addMessageListener("Panorama:isDocumentLoaded", WindowMessageHandler.isDocumentLoaded);
// ----------
// WebProgressListener
//
// Observe the web progress of content pages loaded into this browser. When the
// state of a page changes we check if we're still allowed to store page
// information permanently.
let WebProgressListener = {
// ----------
// Function: onStateChange
// Called by the webProgress when its state changes.
onStateChange: function WPL_onStateChange(webProgress, request, flag, status) {
// The browser just started loading (again). Explicitly grant storage
// because the browser might have been blocked before (e.g. when navigating
// from a https-page to a http-page).
if (flag & Ci.nsIWebProgressListener.STATE_START) {
// ensure the dom window is the top one
if (this._isTopWindow(webProgress))
sendAsyncMessage("Panorama:StoragePolicy:granted");
}
// The browser finished loading - check the cache control headers. Send
// a message if we're not allowed to store information about this page.
if (flag & Ci.nsIWebProgressListener.STATE_STOP) {
// ensure the dom window is the top one
if (this._isTopWindow(webProgress) &&
request && request instanceof Ci.nsIHttpChannel) {
request.QueryInterface(Ci.nsIHttpChannel);
let exclude = false;
let reason = "";
// Check if the "Cache-Control" header is "no-store". In this case we're
// not allowed to store information about the current page.
if (this._isNoStoreResponse(request)) {
exclude = true;
reason = "no-store";
}
// Otherwise we'll deny storage if we're currently viewing a https
// page without a "Cache-Control: public" header.
else if (request.URI.schemeIs("https")) {
let cacheControlHeader = this._getCacheControlHeader(request);
if (cacheControlHeader && !(/public/i).test(cacheControlHeader)) {
exclude = true;
reason = "https";
}
}
if (exclude)
sendAsyncMessage("Panorama:StoragePolicy:denied", {reason: reason});
}
}
},
// ----------
// Function: _isTopWindow
// Returns whether the DOMWindow associated with the webProgress is the
// top content window (and not an iframe or similar).
_isTopWindow: function WPL__isTopWindow(webProgress) {
// can throw if there's no associated DOMWindow
return !!Utils.attempt(function () webProgress.DOMWindow == content);
},
// ----------
// Function: _isNoStoreResponse
// Checks if the "Cache-Control" header is "no-store".
_isNoStoreResponse: function WPL__isNoStoreResponse(req) {
// can throw if called before the response has been received
return !!Utils.attempt(function () req.isNoStoreResponse());
},
// ----------
// Function: _getCacheControlHeader
// Returns the value of the "Cache-Control" header.
_getCacheControlHeader: function WPL__getCacheControlHeader(req) {
// can throw when the "Cache-Control" header doesn't exist
return Utils.attempt(function () req.getResponseHeader("Cache-Control"));
},
// ----------
// Implements progress listener interface.
QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
Ci.nsISupportsWeakReference,
Ci.nsISupports])
};
// add web progress listener
webProgress.addProgressListener(WebProgressListener, Ci.nsIWebProgress.NOTIFY_STATE_WINDOW);