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PC World 2008 September
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greasemonkey-0.8.20080609.0-fx.xpi
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xmlhttprequester.js
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2008-06-09
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119 lines
function GM_xmlhttpRequester(unsafeContentWin, chromeWindow) {
this.unsafeContentWin = unsafeContentWin;
this.chromeWindow = chromeWindow;
}
// this function gets called by user scripts in content security scope to
// start a cross-domain xmlhttp request.
//
// details should look like:
// {method,url,onload,onerror,onreadystatechange,headers,data}
// headers should be in the form {name:value,name:value,etc}
// can't support mimetype because i think it's only used for forcing
// text/xml and we can't support that
GM_xmlhttpRequester.prototype.contentStartRequest = function(details) {
if (!GM_apiLeakCheck("GM_xmlhttpRequest")) {
return;
}
// don't actually need the timer functionality, but this pops it
// out into chromeWindow's thread so that we get that security
// context.
GM_log("> GM_xmlhttpRequest.contentStartRequest");
// important to store this locally so that content cannot trick us up with
// a fancy getter that checks the number of times it has been accessed,
// returning a dangerous URL the time that we actually use it.
var url = details.url;
// make sure that we have an actual string so that we can't be fooled with
// tricky toString() implementations.
if (typeof url != "string") {
throw new Error("Invalid url: url must be of type string");
}
var ioService = Components.classes["@mozilla.org/network/io-service;1"]
.getService(Components.interfaces.nsIIOService);
var scheme = ioService.extractScheme(url);
// This is important - without it, GM_xmlhttpRequest can be used to get
// access to things like files and chrome. Careful.
switch (scheme) {
case "http":
case "https":
case "ftp":
this.chromeWindow.setTimeout(
GM_hitch(this, "chromeStartRequest", url, details), 0);
break;
default:
throw new Error("Invalid url: " + url);
}
GM_log("< GM_xmlhttpRequest.contentStartRequest");
};
// this function is intended to be called in chrome's security context, so
// that it can access other domains without security warning
GM_xmlhttpRequester.prototype.chromeStartRequest = function(safeUrl, details) {
GM_log("> GM_xmlhttpRequest.chromeStartRequest");
var req = new this.chromeWindow.XMLHttpRequest();
this.setupRequestEvent(this.unsafeContentWin, req, "onload", details);
this.setupRequestEvent(this.unsafeContentWin, req, "onerror", details);
this.setupRequestEvent(this.unsafeContentWin, req, "onreadystatechange",
details);
req.open(details.method, safeUrl);
if (details.overrideMimeType) {
req.overrideMimeType(details.overrideMimeType);
}
if (details.headers) {
for (var prop in details.headers) {
req.setRequestHeader(prop, details.headers[prop]);
}
}
req.send((details.data) ? details.data : null);
GM_log("< GM_xmlhttpRequest.chromeStartRequest");
}
// arranges for the specified 'event' on xmlhttprequest 'req' to call the
// method by the same name which is a property of 'details' in the content
// window's security context.
GM_xmlhttpRequester.prototype.setupRequestEvent =
function(unsafeContentWin, req, event, details) {
GM_log("> GM_xmlhttpRequester.setupRequestEvent");
if (details[event]) {
req[event] = function() {
GM_log("> GM_xmlhttpRequester -- callback for " + event);
var responseState = {
// can't support responseXML because security won't
// let the browser call properties on it
responseText:req.responseText,
readyState:req.readyState,
responseHeaders:(req.readyState == 4 ?
req.getAllResponseHeaders() :
""),
status:(req.readyState == 4 ? req.status : 0),
statusText:(req.readyState == 4 ? req.statusText : ""),
finalUrl:(req.readyState == 4 ? req.channel.URI.spec : "")
}
// Pop back onto browser thread and call event handler.
// Have to use nested function here instead of GM_hitch because
// otherwise details[event].apply can point to window.setTimeout, which
// can be abused to get increased priveledges.
new XPCNativeWrapper(unsafeContentWin, "setTimeout()")
.setTimeout(function(){details[event](responseState);}, 0);
GM_log("< GM_xmlhttpRequester -- callback for " + event);
}
}
GM_log("< GM_xmlhttpRequester.setupRequestEvent");
};