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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1
*
* 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 the Open in Browser extension.
*
* The Initial Developer of the Original Code is
* Sylvain Pasche <sylvain.pasche@gmail.com>.
* Portions created by the Initial Developer are Copyright (C) 2009
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* ***** END LICENSE BLOCK ***** */
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const MAX_INTERCEPT_TIME = 10000;
const EXAMINE_TOPIC = "http-on-examine-response";
const EXAMINE_MERGED_TOPIC = "http-on-examine-merged-response";
const DEBUG = false;
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
/**
* This object stores information which will be used for intercepting URL's
*/
function InterceptedInfo(url, mime) {
this.url = url;
this.mime = mime;
}
function debug(msg) {
if (DEBUG)
dump(msg + "\n");
}
/**
* The service
*/
function OpenInBrowser() {
this.wrappedJSObject = this;
this._interceptedInfos = [];
};
OpenInBrowser.prototype = {
classDescription: "Open in browser Javascript XPCOM Component",
classID: Components.ID("{14aa9340-c449-4956-a5f9-a52fb32f933d}"),
contractID: "@spasche.net/openinbrowser;1",
_clearCacheEntry: function OIB_clearCacheEntry(url) {
const cacheService = Cc["@mozilla.org/network/cache-service;1"].
getService(Ci.nsICacheService);
var httpCacheSession = cacheService.createSession("HTTP", 0, true);
httpCacheSession.doomEntriesIfExpired = false;
try {
var cacheKey = url.replace(/#.*$/, "");
var entry = httpCacheSession.openCacheEntry(cacheKey, Ci.nsICache.ACCESS_READ_WRITE, false);
entry.doom();
entry.close();
} catch (e) {
debug("Exception during cache clearing: " + e);
}
},
addInterceptInfo: function OIB_addInterceptInfo(url, mime) {
debug("Added intercept info " + url);
this._clearCacheEntry(url);
this._interceptedInfos.push(new InterceptedInfo(url, mime));
if (this._interceptedInfos.length == 1) {
this._startCapture();
}
// remove intercepted url's after a while in case the observer is not triggered
var timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
var self = this;
var callback = {
notify: function notifyCallback(timer) {
self._removeInterceptedInfo(url);
}
}
timer.initWithCallback(callback, MAX_INTERCEPT_TIME, Ci.nsITimer.TYPE_ONE_SHOT);
},
_startCapture: function OIB_startCapture() {
debug("Start capture");
var observerService = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
observerService.addObserver(this, EXAMINE_TOPIC, false);
observerService.addObserver(this, EXAMINE_MERGED_TOPIC, false);
},
_stopCapture: function OIB_stopCapture() {
var observerService = Cc["@mozilla.org/observer-service;1"].
getService(Ci.nsIObserverService);
observerService.removeObserver(this, EXAMINE_TOPIC);
observerService.removeObserver(this, EXAMINE_MERGED_TOPIC);
debug("capture stopped");
},
_getInterceptedInfo: function OIB_getInterceptedInfo(url) {
for (var i = 0; i < this._interceptedInfos.length; i++) {
if (this._interceptedInfos[i].url == url)
return this._interceptedInfos[i];
}
return null;
},
_removeInterceptedInfo: function OIB_removeInterceptedInfo(url) {
var index = -1;
for (var i = 0; i < this._interceptedInfos.length; i++) {
if (this._interceptedInfos[i].url == url) {
index = i;
break;
}
}
if (index == -1) {
return;
}
this._interceptedInfos.splice(index, 1);
if (this._interceptedInfos.length == 0) {
this._stopCapture();
}
},
observe: function OIB_observe(aSubject, aTopic, aData) {
if (aTopic != EXAMINE_TOPIC && aTopic != EXAMINE_MERGED_TOPIC)
return;
var channel = aSubject.QueryInterface(Ci.nsIHttpChannel);
var url = channel.originalURI.spec;
debug("Observer inspecting: " + url);
var interceptedInfo = this._getInterceptedInfo(url);
if (!interceptedInfo)
return;
debug("Got a match " + url);
channel.contentType = interceptedInfo.mime;
// Disable content sniffers that could override the new mime type
channel.loadFlags &= ~Ci.nsIChannel.LOAD_CALL_CONTENT_SNIFFERS;
// drop content-disposition header
channel.setResponseHeader("Content-Disposition", "", false);
this._removeInterceptedInfo(url);
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver])
};
if (XPCOMUtils.generateNSGetFactory)
var NSGetFactory = XPCOMUtils.generateNSGetFactory([OpenInBrowser]);
else
var NSGetModule = XPCOMUtils.generateNSGetModule([OpenInBrowser]);
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