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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");
Components.utils.import("resource://gre/modules/osfile.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]),
_addLink : function(links, url, name, type)
{
links.push({ url, name, type });
},
_addLinksFromItem: function(links, dt, i)
{
let types = dt.mozTypesAt(i);
let type, data;
type = "text/uri-list";
if (types.contains(type)) {
data = dt.mozGetDataAt(type, i);
if (data) {
let urls = data.split("\n");
for (let url of urls) {
// lines beginning with # are comments
if (url.startsWith("#"))
continue;
url = url.replace(/^\s+|\s+$/g, "");
this._addLink(links, url, url, type);
}
return;
}
}
type = "text/x-moz-url";
if (types.contains(type)) {
data = dt.mozGetDataAt(type, i);
if (data) {
let lines = data.split("\n");
for (let i = 0, length = lines.length; i < length; i += 2) {
this._addLink(links, lines[i], lines[i + 1], type);
}
return;
}
}
for (let type of ["text/plain", "text/x-moz-text-internal"]) {
if (types.contains(type)) {
data = dt.mozGetDataAt(type, i);
if (data) {
let lines = data.replace(/^\s+|\s+$/mg, "").split("\n");
for (let line of lines) {
this._addLink(links, line, line, type);
}
return;
}
}
}
// 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 files = dt.files;
if (files && i < files.length) {
this._addLink(links, OS.Path.toFileURI(files[i].mozFullPath),
files[i].name, "application/x-moz-file");
}
},
_getDropLinks : function (dt)
{
let links = [];
for (let i = 0; i < dt.mozItemCount; i++) {
this._addLinksFromItem(links, dt, i);
}
return links;
},
_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.createCodebasePrincipal(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.includes("application/x-moz-file") &&
!types.includes("text/x-moz-url") &&
!types.includes("text/uri-list") &&
!types.includes("text/x-moz-text-internal") &&
!types.includes("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) {
if (sourceDocument.defaultView == null)
return true;
let sourceRoot = sourceDocument.defaultView.top;
if (sourceRoot && sourceRoot == eventDocument.defaultView.top)
return false;
}
return true;
},
dropLink: function(aEvent, aName, aDisallowInherit)
{
aName.value = "";
let links = this.dropLinks(aEvent, aDisallowInherit);
let url = "";
if (links.length > 0) {
url = links[0].url;
let name = links[0].name;
if (name)
aName.value = name;
}
return url;
},
dropLinks: function(aEvent, aDisallowInherit, aCount)
{
if (aEvent && this._eventTargetIsDisabled(aEvent))
return [];
let dataTransfer = aEvent.dataTransfer;
let links = this._getDropLinks(dataTransfer);
for (let link of links) {
try {
link.url = this._validateURI(dataTransfer, link.url, aDisallowInherit);
} catch (ex) {
// Prevent the drop entirely if any of the links are invalid even if
// one of them is valid.
aEvent.stopPropagation();
aEvent.preventDefault();
throw ex;
}
}
if (aCount)
aCount.value = links.length;
return links;
},
_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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