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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
const Cc = Components.classes;
const Ci = Components.interfaces;
// This component is used for handling dragover and drop of urls.
//
// It checks to see whether a drop of a url is allowed. For instance, a url
// cannot be dropped if it is not a valid uri or the source of the drag cannot
// access the uri. This prevents, for example, a source document from tricking
// the user into dragging a chrome url.
function ContentAreaDropListener() { };
ContentAreaDropListener.prototype =
{
classID: Components.ID("{1f34bc80-1bc7-11d6-a384-d705dd0746fc}"),
QueryInterface: XPCOMUtils.generateQI([Ci.nsIDroppedLinkHandler, Ci.nsISupports]),
_getDropURL : function (dt)
{
let types = dt.types;
for (let t = 0; t < types.length; t++) {
let type = types[t];
switch (type) {
case "text/uri-list":
var url = dt.getData("URL").replace(/^\s+|\s+$/g, "");
return [url, url];
case "text/plain":
case "text/x-moz-text-internal":
var url = dt.getData(type).replace(/^\s+|\s+$/g, "");
return [url, url];
case "text/x-moz-url":
return dt.getData(type).split("\n");
}
}
// For shortcuts, we want to check for the file type last, so that the
// url pointed to in one of the url types is found first before the file
// type, which points to the actual file.
let file = dt.mozGetDataAt("application/x-moz-file", 0);
if (file instanceof Ci.nsIFile) {
let ioService = Cc["@mozilla.org/network/io-service;1"].
getService(Ci.nsIIOService);
let fileHandler = ioService.getProtocolHandler("file")
.QueryInterface(Ci.nsIFileProtocolHandler);
return [fileHandler.getURLSpecFromFile(file), file.leafName];
}
return [ ];
},
_validateURI: function(dataTransfer, uriString, disallowInherit)
{
if (!uriString)
return "";
// Strip leading and trailing whitespace, then try to create a
// URI from the dropped string. If that succeeds, we're
// dropping a URI and we need to do a security check to make
// sure the source document can load the dropped URI.
uriString = uriString.replace(/^\s*|\s*$/g, '');
let uri;
let ioService = Cc["@mozilla.org/network/io-service;1"]
.getService(Components.interfaces.nsIIOService);
try {
// Check that the uri is valid first and return an empty string if not.
// It may just be plain text and should be ignored here
uri = ioService.newURI(uriString, null, null);
} catch (ex) { }
if (!uri)
return uriString;
// uriString is a valid URI, so do the security check.
let secMan = Cc["@mozilla.org/scriptsecuritymanager;1"].
getService(Ci.nsIScriptSecurityManager);
let sourceNode = dataTransfer.mozSourceNode;
let flags = secMan.STANDARD;
if (disallowInherit)
flags |= secMan.DISALLOW_INHERIT_PRINCIPAL;
// Use file:/// as the default uri so that drops of file URIs are always allowed
let principal = sourceNode ? sourceNode.nodePrincipal
: secMan.getSimpleCodebasePrincipal(ioService.newURI("file:///", null, null));
secMan.checkLoadURIStrWithPrincipal(principal, uriString, flags);
return uriString;
},
canDropLink: function(aEvent, aAllowSameDocument)
{
if (this._eventTargetIsDisabled(aEvent))
return false;
let dataTransfer = aEvent.dataTransfer;
let types = dataTransfer.types;
if (!types.contains("application/x-moz-file") &&
!types.contains("text/x-moz-url") &&
!types.contains("text/uri-list") &&
!types.contains("text/x-moz-text-internal") &&
!types.contains("text/plain"))
return false;
if (aAllowSameDocument)
return true;
let sourceNode = dataTransfer.mozSourceNode;
if (!sourceNode)
return true;
// don't allow a drop of a node from the same document onto this one
let sourceDocument = sourceNode.ownerDocument;
let eventDocument = aEvent.originalTarget.ownerDocument;
if (sourceDocument == eventDocument)
return false;
// also check for nodes in other child or sibling frames by checking
// if both have the same top window.
if (sourceDocument && eventDocument) {
let sourceRoot = sourceDocument.defaultView.top;
if (sourceRoot && sourceRoot == eventDocument.defaultView.top)
return false;
}
return true;
},
dropLink: function(aEvent, aName, aDisallowInherit)
{
aName.value = "";
if (this._eventTargetIsDisabled(aEvent))
return "";
let dataTransfer = aEvent.dataTransfer;
let [url, name] = this._getDropURL(dataTransfer);
try {
url = this._validateURI(dataTransfer, url, aDisallowInherit);
} catch (ex) {
aEvent.stopPropagation();
aEvent.preventDefault();
throw ex;
}
if (name)
aName.value = name;
return url;
},
_eventTargetIsDisabled: function(aEvent)
{
let ownerDoc = aEvent.originalTarget.ownerDocument;
if (!ownerDoc || !ownerDoc.defaultView)
return false;
return ownerDoc.defaultView
.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
.getInterface(Components.interfaces.nsIDOMWindowUtils)
.isNodeDisabledForEvents(aEvent.originalTarget);
}
};
var components = [ContentAreaDropListener];
this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
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