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// Copyright (c) 2008-2009 Kris Maglione <maglione.k at Gmail>
//
// This work is licensed for reuse under an MIT license. Details are
// given in the LICENSE.txt file included with this file.
/* Adds support for data: URIs with chrome privileges
* and fragment identifiers.
*
* "chrome-data:" <content-type> [; <flag>]* "," [<data>]
*
* By Kris Maglione, ideas from Ed Anuff's nsChromeExtensionHandler.
*/
const Ci = Components.interfaces, Cc = Components.classes;
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
const NS_BINDING_ABORTED = 0x804b0002;
const nsIProtocolHandler = Components.interfaces.nsIProtocolHandler;
const ioService = Cc["@mozilla.org/network/io-service;1"].getService(Ci.nsIIOService);
let channel = Components.classesByID["{61ba33c0-3031-11d3-8cd0-0060b0fc14a3}"]
.getService(Ci.nsIProtocolHandler)
.newChannel(ioService.newURI("chrome://liberator/content/data", null, null))
.QueryInterface(Ci.nsIRequest);
const systemPrincipal = channel.owner;
channel.cancel(NS_BINDING_ABORTED);
delete channel;
function makeChannel(url, orig)
{
let uri = ioService.newURI(url, null, null);
let channel = ioService.newChannelFromURI(uri);
channel.owner = systemPrincipal;
channel.originalURI = orig;
return channel;
}
function fakeChannel(orig)
makeChannel("chrome://liberator/content/does/not/exist", orig);
function redirect(to, orig)
{
let html = <html><head><meta http-equiv="Refresh" content={"0;" + to}/></head></html>.toXMLString();
return makeChannel('data:text/html,' + escape(html), orig);
}
function ChromeData() {}
ChromeData.prototype = {
contractID: "@mozilla.org/network/protocol;1?name=chrome-data",
classID: Components.ID("{c1b67a07-18f7-4e13-b361-2edcc35a5a0d}"),
classDescription: "Data URIs with chrome privileges",
QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsIProtocolHandler]),
_xpcom_factory: {
createInstance: function (outer, iid)
{
if (!ChromeData.instance)
ChromeData.instance = new ChromeData();
if (outer != null)
throw Components.results.NS_ERROR_NO_AGGREGATION;
return ChromeData.instance.QueryInterface(iid);
}
},
scheme: "chrome-data",
defaultPort: -1,
allowPort: function (port, scheme) false,
protocolFlags: nsIProtocolHandler.URI_NORELATIVE
| nsIProtocolHandler.URI_NOAUTH
| nsIProtocolHandler.URI_IS_UI_RESOURCE,
newURI: function (spec, charset, baseURI)
{
var uri = Components.classes["@mozilla.org/network/standard-url;1"]
.createInstance(Components.interfaces.nsIStandardURL)
.QueryInterface(Components.interfaces.nsIURI);
uri.init(uri.URLTYPE_STANDARD, this.defaultPort, spec, charset, null);
return uri;
},
newChannel: function (uri)
{
try
{
if (uri.scheme == this.scheme)
return makeChannel(uri.spec.replace(/^.*?:\/*(.*)(?:#.*)?/, "data:$1"), uri);
}
catch (e) {}
return fakeChannel();
}
};
function Liberator()
{
this.wrappedJSObject = this;
const self = this;
this.HELP_TAGS = {};
this.FILE_MAP = {};
this.OVERLAY_MAP = {};
this.NAMESPACES = [];
}
Liberator.prototype = {
contractID: "@mozilla.org/network/protocol;1?name=liberator",
classID: Components.ID("{9c8f2530-51c8-4d41-b356-319e0b155c44}"),
classDescription: "Liberator utility protocol",
QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsIProtocolHandler]),
_xpcom_factory: {
createInstance: function (outer, iid)
{
if (!Liberator.instance)
Liberator.instance = new Liberator();
if (outer != null)
throw Components.results.NS_ERROR_NO_AGGREGATION;
return Liberator.instance.QueryInterface(iid);
}
},
init: function (obj)
{
for each (let prop in ["HELP_TAGS", "FILE_MAP", "OVERLAY_MAP", "NAMESPACES"])
for (let [k, v] in Iterator(obj[prop]))
this[prop][k] = v
},
scheme: "liberator",
defaultPort: -1,
allowPort: function (port, scheme) false,
protocolFlags: 0
| nsIProtocolHandler.URI_IS_UI_RESOURCE
| nsIProtocolHandler.URI_IS_LOCAL_RESOURCE,
newURI: function (spec, charset, baseURI)
{
var uri = Components.classes["@mozilla.org/network/standard-url;1"]
.createInstance(Components.interfaces.nsIStandardURL)
.QueryInterface(Components.interfaces.nsIURI);
uri.init(uri.URLTYPE_STANDARD, this.defaultPort, spec, charset, baseURI);
return uri;
},
newChannel: function (uri)
{
try
{
switch(uri.host)
{
case "help":
let url = this.FILE_MAP[uri.path.replace(/^\/|#.*/g, "")];
return makeChannel(url, uri);
case "help-overlay":
url = this.OVERLAY_MAP[uri.path.replace(/^\/|#.*/g, "")];
return makeChannel(url, uri);
case "help-tag":
let tag = uri.path.substr(1);
if (tag in this.HELP_TAGS)
return redirect("liberator://help/" + this.HELP_TAGS[tag] + "#" + tag, uri);
}
}
catch (e) {}
return fakeChannel(uri);
}
};
var components = [ChromeData, Liberator];
function NSGetModule(compMgr, fileSpec)
{
return XPCOMUtils.generateModule(components);
}
// vim: set fdm=marker sw=4 ts=4 et:
|
