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Issue 29338242: Issue 3792 - Fix to support multiprocess firefox (Closed)
Patch Set: add missed space Created April 7, 2016, 8:35 p.m.
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1 /*
2 * This Source Code is subject to the terms of the Mozilla Public License
3 * version 2.0 (the "License"). You can obtain a copy of the License at
4 * http://mozilla.org/MPL/2.0/.
5 */
6 "use strict";
7
8 const {classes: Cc, interfaces: Ci, utils: Cu} = Components;
9
10 /**
11 * @param e exception
12 */
13 function reportException(e)
14 {
15 let stack = "";
16 if (e && typeof e == "object" && "stack" in e)
17 stack = e.stack + "\n";
18
19 Cu.reportError(e);
20 dump(e + "\n" + stack + "\n");
21 }
22
23 let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
24 let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
25
26 /**
27 * Waits for finishing of the page loading, calls `gatherPageInfo` and sends
28 * gahter information using "abpcrawler:pageInfoGathered" message.
29 * https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XPCOM/Reference/Interfa ce/nsIWebProgressListener
30 */
31 let webProgressListener =
32 {
33 onStateChange: function(webProgress, request, flags, status)
34 {
35 // use isTopLevel to filter beacon requests out
36 if (webProgress.isTopLevel &&
37 (flags & Ci.nsIWebProgressListener.STATE_STOP) &&
38 (flags & Ci.nsIWebProgressListener.STATE_IS_WINDOW))
39 {
40 if (request instanceof Ci.nsIHttpChannel)
41 {
42 let pageInfo = {headers: []};
43 try
44 {
45 pageInfo.headers.push("HTTP/x.x " + request.responseStatus + " " + req uest.responseStatusText);
46 request.visitResponseHeaders((header, value) => pageInfo.headers.push( header + ": " + value));
47 }
48 catch (e)
49 {
50 reportException(e);
51 }
52 Object.assign(pageInfo, gatherPageInfo(content));
53 sendAsyncMessage("abpcrawler:pageInfoGathered", pageInfo);
54 }
55 }
56 },
57
58 // definitions of the remaining functions see related documentation
59 onLocationChange: function(webProgress, request, URI, flag) {},
60 onProgressChange: function(aWebProgress, aRequest, curSelf, maxSelf, curTot, m axTot) {},
61 onStatusChange: function(aWebProgress, aRequest, aStatus, aMessage) {},
62 onSecurityChange: function(aWebProgress, aRequest, aState) {},
63
64 QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener, Ci.nsISuppor tsWeakReference])
65 };
66
67 let filter = Cc["@mozilla.org/appshell/component/browser-status-filter;1"]
68 .createInstance(Ci.nsIWebProgress);
69 filter.addProgressListener(webProgressListener, Ci.nsIWebProgress.NOTIFY_ALL);
70
71 let webProgress = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
72 .getInterface(Ci.nsIWebProgress);
73 webProgress.addProgressListener(filter, Ci.nsIWebProgress.NOTIFY_ALL);
74
75 /**
76 * Gathers information about page using DOM window.
77 * Currently
78 * - creates a screenshot of the page
79 * - serializes the page source code
80 * @param {nsIDOMWindow} wnd window to process
81 * @return {Object} the object containing "screenshot" and "source" properties.
82 */
83 function gatherPageInfo(wnd)
84 {
85 let document = wnd.document;
86 let result = {};
87 if (document.documentElement)
88 {
89 try
90 {
91 let canvas = document.createElementNS("http://www.w3.org/1999/xhtml", "can vas");
92 canvas.width = document.documentElement.scrollWidth;
93 canvas.height = document.documentElement.scrollHeight;
94 if (canvas.width > 0 && canvas.height > 0)
95 {
96 let context = canvas.getContext("2d");
97 context.drawWindow(wnd, 0, 0, canvas.width, canvas.height, "rgb(255, 255 , 255)");
98 result.screenshot = canvas.toDataURL("image/jpeg", 0.8);
99 }
100 // TODO: Capture frames as well?
101 let serializer = new wnd.XMLSerializer();
102 result.source = serializer.serializeToString(document.documentElement);
103 }
104 catch (e)
105 {
106 reportException(e);
107 result.error = "Cannot gather page info";
108 }
109 }
110 return result;
111 }
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