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Better way to listen to events and verify them.

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This commit is contained in:
Brendan Dahl 2012-01-27 10:53:07 -08:00
parent 0d839c1c59
commit e7a0a2e129
2 changed files with 68 additions and 150 deletions
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70
extensions/firefox/components/pdfContentHandler.js
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@ -7,8 +7,10 @@ const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;
const PDFJS_EVENT_ID = 'pdf.js.message';
const PDF_CONTENT_TYPE = 'application/pdf';
const NS_ERROR_NOT_IMPLEMENTED = 0x80004001;
const EXT_PREFIX = 'extensions.uriloader@pdf.js';
Cu.import('resource://gre/modules/XPCOMUtils.jsm');
Cu.import('resource://gre/modules/Services.jsm');
@ -19,8 +21,50 @@ function log(aMsg) {
.logStringMessage(msg);
dump(msg + '\n');
}
let application = Cc['@mozilla.org/fuel/application;1']
.getService(Ci.fuelIApplication);
let privateBrowsing = Cc['@mozilla.org/privatebrowsing;1']
.getService(Ci.nsIPrivateBrowsingService);
let inPrivateBrowswing = privateBrowsing.privateBrowsingEnabled;
// All the priviledged actions.
function ChromeActions() {
this.inPrivateBrowswing = privateBrowsing.privateBrowsingEnabled;
}
ChromeActions.prototype = {
download: function(data) {
Services.wm.getMostRecentWindow('navigator:browser').saveURL(data);
},
setDatabase: function() {
if (this.inPrivateBrowswing)
return;
application.prefs.setValue(EXT_PREFIX + '.database', data);
},
getDatabase: function() {
if (this.inPrivateBrowswing)
return '{}';
return application.prefs.getValue(EXT_PREFIX + '.database', '{}');
}
};
// Event listener to trigger chrome privedged code.
function RequestListener(actions) {
this.actions = actions;
}
// Recieves an event and synchronously responds.
RequestListener.prototype.recieve = function(event) {
var message = event.target;
var action = message.getUserData('action');
var data = message.getUserData('data');
var actions = this.actions;
if (!(action in actions)) {
log('Unknown action: ' + action);
return;
}
var response = actions[action].call(this.actions, data);
message.setUserData('response', response, null);
};
const NS_ERROR_NOT_IMPLEMENTED = 0x80004001;
function pdfContentHandler() {
}
@ -70,6 +114,7 @@ pdfContentHandler.prototype = {
// nsIRequestObserver::onStartRequest
onStartRequest: function(aRequest, aContext) {
// Setup the request so we can use it below.
aRequest.QueryInterface(Ci.nsIChannel);
// Cancel the request so the viewer can handle it.
@ -80,15 +125,34 @@ pdfContentHandler.prototype = {
.getService(Ci.nsIIOService);
var channel = ioService.newChannel(
'resource://pdf.js/web/viewer.html', null, null);
// Keep the URL the same so the browser sees it as the same.
channel.originalURI = aRequest.originalURI;
channel.asyncOpen(this.listener, aContext);
// Setup a global listener waiting for the next DOM to be created and verfiy
// that its the one we want by its URL. When the correct DOM is found create
// an event listener on that window for the pdf.js events that require
// chrome priviledges.
var url = aRequest.originalURI.spec;
var gb = Services.wm.getMostRecentWindow('navigator:browser');
var domListener = function domListener(event) {
var doc = event.originalTarget;
var win = doc.defaultView;
if (doc.location.href === url) {
gb.removeEventListener('DOMContentLoaded', domListener);
var requestListener = new RequestListener(new ChromeActions());
win.addEventListener(PDFJS_EVENT_ID, function(event) {
requestListener.recieve(event);
}, false, true);
}
};
gb.addEventListener('DOMContentLoaded', domListener, false);
},
// nsIRequestObserver::onStopRequest
onStopRequest: function(aRequest, aContext, aStatusCode) {
// Do nothing.
return;
}
};