Mercurial > powerbox

annotate extension/modules/content-injector.js @ 4:1c02976d8809

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Changed to Firebug's progress listener, which allows us to inject our code before any scripts are executed on target pages.
author Atul Varma <varmaa@toolness.com>
date Thu, 06 Aug 2009 17:18:45 -0700
parents 413435fc6202
children c01a64fefbf5
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2
889c2fd4c9cf window.powerbox.request() is now available on every content window.
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1 var EXPORTED_SYMBOLS = ["init"];
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2
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3 const Cc = Components.classes;
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4 const Ci = Components.interfaces;
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5 const Cu = Components.utils;
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6
3
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7 const REQUEST_BOX_NAME = "powerbox_superpower_request";
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8 const REQUEST_BOX_TEXT = "This web page wants superpowers.";
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9 const REQUEST_BOX_BUTTON_TEXT = "Huh?";
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10
2
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11 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
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12
3
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13 function getParentChromeWindow(window) {
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14 var mainWindow = window.QueryInterface(Ci.nsIInterfaceRequestor)
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15 .getInterface(Ci.nsIWebNavigation)
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16 .QueryInterface(Ci.nsIDocShellTreeItem)
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17 .rootTreeItem
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18 .QueryInterface(Ci.nsIInterfaceRequestor)
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19 .getInterface(Ci.nsIDOMWindow);
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20 return mainWindow.wrappedJSObject;
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21 }
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22
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23 function showRequestNotificationBox(window, caps, callback) {
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24 var tabbrowser = getParentChromeWindow(window).getBrowser();
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25 var browser = tabbrowser.getBrowserForDocument(window.document);
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26
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27 if (browser) {
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28 var nBox = tabbrowser.getNotificationBox(browser);
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29
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30 var oldNotification = nBox.getNotificationWithValue(REQUEST_BOX_NAME);
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31 if (oldNotification)
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32 nBox.removeNotification(oldNotification);
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33
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34 nBox.appendNotification(REQUEST_BOX_TEXT,
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35 REQUEST_BOX_NAME,
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36 null,
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37 nBox.PRIORITY_INFO_MEDIUM,
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38 [{accessKey: null,
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39 // TODO: Implement a real callback.
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40 callback: function() {},
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41 label: REQUEST_BOX_BUTTON_TEXT,
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42 popup: null}]);
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43 }
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44 }
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45
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46 function buildRequestor(window) {
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47 return function request(caps, callback) {
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48 if (!(typeof(caps) == "object" ||
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49 typeof(caps) == "string"))
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50 throw new Error("Must provide capabilities as first parameter.");
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51
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52 if (typeof(callback) != "function")
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53 throw new Error("Must provide callback as second parameter");
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54
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55 if (typeof(caps) == "object")
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56 caps = new XPCSafeJSObjectWrapper(caps);
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57 callback = new XPCSafeJSObjectWrapper(callback);
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58
3
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59 showRequestNotificationBox(window, caps, callback);
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60 };
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61 }
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62
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63 // Taken from Firebug's content/firebug/tabWatcher.js.
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64 function safeGetName(request) {
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65 try {
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66 return request.name;
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67 } catch (exc) {
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68 return null;
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69 }
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70 }
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71
2
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72 var listener = {
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73 QueryInterface : XPCOMUtils.generateQI([Ci.nsIWebProgressListener,
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74 Ci.nsISupportsWeakReference]),
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75
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76 // Much of this is taken from Firebug's content/firebug/tabWatcher.js,
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77 // specifically the FrameProgressListener object.
2
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78 onStateChange : function (aWebProgress, aRequest,
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79 aStateFlags, aStatus) {
4
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80 if (aStateFlags & Ci.nsIWebProgressListener.STATE_IS_REQUEST &&
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81 aStateFlags & Ci.nsIWebProgressListener.STATE_START) {
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82 // We need to get the hook in as soon as the new DOMWindow is
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83 // created, but before it starts executing any scripts in the
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84 // page. After lengthy analysis, it seems that the start of
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85 // these "dummy" requests is the only state that works.
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86
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87 // TODO: Firebug's code mentions that XHTML doesn't dispatch
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88 // any of these dummy requests, so we should probably use the
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89 // Firebug's XHTML workaround here.
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90 var safeName = safeGetName(aRequest);
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91 var window = aWebProgress.DOMWindow;
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92 if (window && window.wrappedJSObject &&
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93 (safeName == "about:layout-dummy-request" ||
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94 safeName == "about:document-onload-blocker")) {
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95 // TODO: Firebug's code mentions that about:blank causes strange
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96 // behavior here; I don't think it should apply to our use case,
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97 // though.
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98 var sandbox = Cu.Sandbox(window);
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99 sandbox.importFunction(buildRequestor(window));
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100 sandbox.window = window.wrappedJSObject;
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101
4
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102 function setupPowerbox() {
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103 window.powerbox = {request: request};
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104 }
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105
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106 Cu.evalInSandbox("(" + setupPowerbox.toString() + ")();", sandbox);
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107 }
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108 }
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109 },
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110
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111 // Stubs for the nsIWebProgressListener interfaces which we don't use.
2
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112 onProgressChange : function() { },
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113 onLocationChange : function() { },
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114 onStatusChange : function() { },
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115 onSecurityChange : function() { }
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116 };
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117
4
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118 function init(window) {
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119 var tabbrowser = window.getBrowser();
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120
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121 function addListener(browser) {
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122 browser.addProgressListener(listener,
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123 Ci.nsIWebProgress.NOTIFY_STATE_DOCUMENT);
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124 }
2
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125
4
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126 tabbrowser.tabContainer.addEventListener(
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127 "TabOpen",
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128 function onTabOpen(event) { addListener(event.target.linkedBrowser); },
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129 false
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130 );
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131
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132 tabbrowser.browsers.forEach(function(browser) { addListener(browser); });
2
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133 }