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ChannelReplacement.js
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ChannelReplacement.js
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Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
function CtxCapturingListener(tracingChannel, captureObserver) {
this.originalListener = tracingChannel.setNewListener(this);
this.captureObserver = captureObserver;
}
CtxCapturingListener.prototype = {
originalListener: null,
originalCtx: null,
onStartRequest: function(request, ctx) {
this.originalCtx = ctx;
if (this.captureObserver) {
this.captureObserver.observeCapture(request, this);
}
},
onDataAvailable: function(request, ctx, inputStream, offset, count) {},
onStopRequest: function(request, ctx, statusCode) {},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIStreamListener])
};
function ChannelReplacement(chan, newURI, newMethod) {
return this._init(chan, newURI, newMethod);
}
ChannelReplacement.supported = "nsITraceableChannel" in Ci;
ChannelReplacement.runWhenPending = function(channel, callback) {
if (channel.isPending()) {
callback();
return false;
} else {
new LoadGroupWrapper(channel, callback);
return true;
}
};
ChannelReplacement.prototype = {
listener: null,
context: null,
oldChannel: null,
channel: null,
window: null,
suspended: false,
get _unsupportedError() {
return new Error("Can't replace channels without nsITraceableChannel!");
},
get _classifierClass() {
delete this.__proto__._classifierClass;
return this.__proto__._classifierClass = Cc["@mozilla.org/channelclassifier"];
},
_autoHeadersRx: /^(?:Host|Cookie|Authorization)$|Cache|^If-/,
visitHeader: function(key, val) {
try {
// we skip authorization and cache-related fields which should be automatically set
if (!this._autoHeadersRx.test(key)) this.channel.setRequestHeader(key, val, false);
} catch (e) {
dump(e + "\n");
}
},
_init: function(chan, newURI, newMethod) {
if (!(ChannelReplacement.supported && chan instanceof Ci.nsITraceableChannel))
throw this._unsupportedError;
newURI = newURI || chan.URI;
var newChan = IOS.newChannelFromURI(newURI);
this.oldChannel = chan;
this.channel = newChan;
// porting of http://mxr.mozilla.org/mozilla-central/source/netwerk/protocol/http/src/nsHttpChannel.cpp#2750
var loadFlags = chan.loadFlags;
if (chan.URI.schemeIs("https"))
loadFlags &= ~chan.INHIBIT_PERSISTENT_CACHING;
newChan.loadGroup = chan.loadGroup;
newChan.notificationCallbacks = chan.notificationCallbacks;
newChan.loadFlags = loadFlags | newChan.LOAD_REPLACE;
if (!(newChan instanceof Ci.nsIHttpChannel))
return this;
// copy headers
chan.visitRequestHeaders(this);
if (!newMethod || newMethod === chan.requestMethod) {
if (newChan instanceof Ci.nsIUploadChannel && chan instanceof Ci.nsIUploadChannel && chan.uploadStream ) {
var stream = chan.uploadStream;
if (stream instanceof Ci.nsISeekableStream) {
stream.seek(stream.NS_SEEK_SET, 0);
}
try {
let ctype = chan.getRequestHeader("Content-type");
let clen = chan.getRequestHeader("Content-length");
if (ctype && clen) {
newChan.setUploadStream(stream, ctype, parseInt(clen, 10));
}
} catch(e) {
newChan.setUploadStream(stream, '', -1);
}
newChan.requestMethod = chan.requestMethod;
}
} else {
newChan.requestMethod = newMethod;
}
if (chan.referrer) newChan.referrer = chan.referrer;
newChan.allowPipelining = chan.allowPipelining;
newChan.redirectionLimit = chan.redirectionLimit - 1;
if (chan instanceof Ci.nsIHttpChannelInternal && newChan instanceof Ci.nsIHttpChannelInternal) {
if (chan.URI == chan.documentURI) {
newChan.documentURI = newURI;
} else {
newChan.documentURI = chan.documentURI;
}
}
if (chan instanceof Ci.nsIEncodedChannel && newChan instanceof Ci.nsIEncodedChannel) {
newChan.applyConversion = chan.applyConversion;
}
// we can't transfer resume information because we can't access mStartPos and mEntityID :(
// http://mxr.mozilla.org/mozilla-central/source/netwerk/protocol/http/src/nsHttpChannel.cpp#2826
if ("nsIApplicationCacheChannel" in Ci &&
chan instanceof Ci.nsIApplicationCacheChannel && newChan instanceof Ci.nsIApplicationCacheChannel) {
newChan.applicationCache = chan.applicationCache;
newChan.inheritApplicationCache = chan.inheritApplicationCache;
}
if (chan instanceof Ci.nsIPropertyBag && newChan instanceof Ci.nsIWritablePropertyBag)
for (var properties = chan.enumerator, p; properties.hasMoreElements();)
if ((p = properties.getNext()) instanceof Ci.nsIProperty)
newChan.setProperty(p.name, p.value);
if (chan.loadFlags & chan.LOAD_DOCUMENT_URI) {
this.window = IOUtil.findWindow(chan);
if (this.window) this.window._replacedChannel = chan;
}
return this;
},
_onChannelRedirect: function() {
var oldChan = this.oldChannel;
var newChan = this.channel;
if (this.realRedirect) {
if (oldChan.redirectionLimit === 0) {
oldChan.cancel(NS_ERROR_REDIRECT_LOOP);
throw NS_ERROR_REDIRECT_LOOP;
}
} else newChan.redirectionLimit += 1;
// nsHttpHandler::OnChannelRedirect()
const CES = Ci.nsIChannelEventSink;
const flags = CES.REDIRECT_INTERNAL;
this._callSink(
Cc["@mozilla.org/netwerk/global-channel-event-sink;1"].getService(CES),
oldChan, newChan, flags);
var sink;
for (let cess = Cc['@mozilla.org/categorymanager;1'].getService(CI.nsICategoryManager)
.enumerateCategory("net-channel-event-sinks");
cess.hasMoreElements();
) {
sink = cess.getNext();
if (sink instanceof CES)
this._callSink(sink, oldChan, newChan, flags);
}
sink = IOUtil.queryNotificationCallbacks(oldChan, CES);
if (sink) this._callSink(sink, oldChan, newChan, flags);
// ----------------------------------
newChan.originalURI = oldChan.originalURI;
sink = IOUtil.queryNotificationCallbacks(oldChan, Ci.nsIHttpEventSink);
if (sink) sink.onRedirect(oldChan, newChan);
},
_callSink: function(sink, oldChan, newChan, flags) {
try {
if ("onChannelRedirect" in sink) sink.onChannelRedirect(oldChan, newChan, flags);
else sink.asyncOnChannelRedirect(oldChan, newChan, flags, this._redirectCallback);
} catch(e) {
if (e.toString().indexOf("(NS_ERROR_DOM_BAD_URI)") !== -1 && oldChan.URI.spec !== newChan.URI.spec) {
let oldURL = oldChan.URI.spec;
try {
oldChan.URI.spec = newChan.URI.spec;
this._callSink(sink, oldChan, newChan, flags);
} catch(e1) {
throw e;
} finally {
oldChan.URI.spec = oldURL;
}
} else if (e.message.indexOf("(NS_ERROR_NOT_AVAILABLE)") === -1) throw e;
}
},
_redirectCallback: ("nsIAsyncVerifyRedirectCallback" in Ci)
? {
QueryInterface: XPCOMUtils.generateQI([Ci.nsIAsyncVerifyRedirectCallback]),
onRedirectVerifyCallback: function(result) {}
}
: null
,
replace: function(realRedirect, callback) {
let self = this;
let oldChan = this.oldChannel;
this.realRedirect = !!realRedirect;
if (typeof(callback) !== "function") {
callback = this._defaultCallback;
}
ChannelReplacement.runWhenPending(oldChan, function() {
if (oldChan.status) return; // channel's doom had been already defined
let ccl = new CtxCapturingListener(oldChan, self);
self.loadGroup = oldChan.loadGroup;
oldChan.loadGroup = null; // prevents the wheel from stopping spinning
if (self._redirectCallback) { // Gecko >= 2
// this calls asyncAbort, which calls onStartRequest on our listener
oldChan.cancel(NS_BINDING_REDIRECTED);
self.suspend(); // believe it or not, this will defer asyncAbort() notifications until resume()
callback(self);
} else {
// legacy (Gecko < 2)
self.observeCapture = function(req, ccl) {
self.open = function() { self._redirect(ccl); };
callback(self);
};
oldChan.cancel(NS_BINDING_REDIRECTED);
}
});
},
observeCapture: function(req, ccl) {
this._redirect(ccl);
},
_defaultCallback: function(replacement) {
replacement.open();
},
open: function() {
this.resume(); // this triggers asyncAbort and the listeners in cascade
},
_redirect: function(ccl) {
let oldChan = this.oldChannel,
newChan = this.channel,
overlap;
if (!(this.window && (overlap = this.window._replacedChannel) !== oldChan)) {
try {
if (ABE.consoleDump && this.window) {
ABE.log("Opening delayed channel: " + oldChan.name + " - (current loading channel for this window " + (overlap && overlap.name) + ")");
}
oldChan.loadGroup = this.loadGroup;
this._onChannelRedirect();
newChan.asyncOpen(ccl.originalListener, ccl.originalCtx);
if (this.window && this.window != IOUtil.findWindow(newChan)) {
// late diverted load, unwanted artifact, abort
IOUtil.abort(newChan);
} else {
// safe browsing hook
if (this._classifierClass)
this._classifierClass.createInstance(Ci.nsIChannelClassifier).start(newChan, true);
}
} catch (e) {
ABE.log(e);
}
} else {
if (ABE.consoleDump) {
ABE.log("Detected double load on the same window: " + oldChan.name + " - " + (overlap && overlap.name));
}
}
this.dispose();
},
suspend: function() {
if (!this.suspended) {
this.oldChannel.suspend();
this.suspended = true;
}
},
resume: function() {
if (this.suspended) {
this.suspended = false;
try {
this.oldChannel.resume();
} catch (e) {}
}
},
dispose: function() {
this.resume();
if (this.loadGroup) {
try {
this.loadGroup.removeRequest(this.oldChannel, null, NS_BINDING_REDIRECTED);
} catch (e) {}
this.loadGroup = null;
}
}
};
function LoadGroupWrapper(channel, callback) {
this._channel = channel;
this._inner = channel.loadGroup;
this._callback = callback;
channel.loadGroup = this;
}
LoadGroupWrapper.prototype = {
QueryInterface: XPCOMUtils.generateQI([Ci.nsILoadGroup]),
get activeCount() {
return this._inner ? this._inner.activeCount : 0;
},
set defaultLoadRequest(v) {
return this._inner ? this._inner.defaultLoadRequest = v : v;
},
get defaultLoadRequest() {
return this._inner ? this._inner.defaultLoadRequest : null;
},
set groupObserver(v) {
return this._inner ? this._inner.groupObserver = v : v;
},
get groupObserver() {
return this._inner ? this._inner.groupObserver : null;
},
set notificationCallbacks(v) {
return this._inner ? this._inner.notificationCallbacks = v : v;
},
get notificationCallbacks() {
return this._inner ? this._inner.notificationCallbacks : null;
},
get requests() {
return this._inner ? this._inner.requests : this._emptyEnum;
},
addRequest: function(r, ctx) {
this.detach();
if (this._inner) try {
this._inner.addRequest(r, ctx);
} catch(e) {
// addRequest may have not been implemented
}
if (r === this._channel)
try {
this._callback(r, ctx);
} catch (e) {}
},
removeRequest: function(r, ctx, status) {
this.detach();
if (this._inner) this._inner.removeRequest(r, ctx, status);
},
detach: function() {
if (this._channel.loadGroup) this._channel.loadGroup = this._inner;
},
_emptyEnum: {
QueryInterface: XPCOMUtils.generateQI([Ci.nsISimpleEnumerator]),
getNext: function() { return null; },
hasMoreElements: function() { return false; }
}
};