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lightning-sunbird  0.9+nobinonly
nsNoDataProtocolContentPolicy.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is Mozilla Corporation.
00018  * Portions created by the Initial Developer are Copyright (C) 2006
00019  * the Initial Developer. All Rights Reserved.
00020  *
00021  * Contributor(s):
00022  *         Jonas Sicking <jonas@sicking.cc> (Original Author)
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
00026  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
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00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /*
00039  * Content policy implementation that prevents all loads of images,
00040  * subframes, etc from protocols that don't return data but rather open
00041  * applications (such as mailto).
00042  */
00043 
00044 #include "nsNoDataProtocolContentPolicy.h"
00045 #include "nsString.h"
00046 #include "nsContentUtils.h"
00047 #include "nsIProtocolHandler.h"
00048 #include "nsIIOService.h"
00049 #include "nsIExternalProtocolHandler.h"
00050 #include "nsIURI.h"
00051 
00052 NS_IMPL_ISUPPORTS1(nsNoDataProtocolContentPolicy, nsIContentPolicy)
00053 
00054 NS_IMETHODIMP
00055 nsNoDataProtocolContentPolicy::ShouldLoad(PRUint32 aContentType,
00056                                           nsIURI *aContentLocation,
00057                                           nsIURI *aRequestingLocation,
00058                                           nsISupports *aRequestingContext,
00059                                           const nsACString &aMimeGuess,
00060                                           nsISupports *aExtra,
00061                                           PRInt16 *aDecision)
00062 {
00063   *aDecision = nsIContentPolicy::ACCEPT;
00064 
00065   if (aContentType == TYPE_OTHER ||
00066       aContentType == TYPE_SCRIPT ||
00067       aContentType == TYPE_IMAGE ||
00068       aContentType == TYPE_STYLESHEET) {
00069     nsCAutoString scheme;
00070     aContentLocation->GetScheme(scheme);
00071     // Fast-track for the common cases
00072     if (scheme.EqualsLiteral("http") ||
00073         scheme.EqualsLiteral("https") ||
00074         scheme.EqualsLiteral("ftp") ||
00075         scheme.EqualsLiteral("file") ||
00076         scheme.EqualsLiteral("chrome")) {
00077       return NS_OK;
00078     }
00079 
00080     nsIIOService* ios = nsContentUtils::GetIOServiceWeakRef();
00081     if (!ios) {
00082       // default to accept, just in case
00083       return NS_OK;
00084     }
00085 
00086     nsCOMPtr<nsIProtocolHandler> handler;
00087     ios->GetProtocolHandler(scheme.get(), getter_AddRefs(handler));
00088 
00089     nsCOMPtr<nsIExternalProtocolHandler> extHandler =
00090       do_QueryInterface(handler);
00091 
00092     if (extHandler) {
00093       *aDecision = nsIContentPolicy::REJECT_REQUEST;
00094     }
00095   }
00096 
00097   return NS_OK;
00098 }
00099 
00100 NS_IMETHODIMP
00101 nsNoDataProtocolContentPolicy::ShouldProcess(PRUint32 aContentType,
00102                                              nsIURI *aContentLocation,
00103                                              nsIURI *aRequestingLocation,
00104                                              nsISupports *aRequestingContext,
00105                                              const nsACString &aMimeGuess,
00106                                              nsISupports *aExtra,
00107                                              PRInt16 *aDecision)
00108 {
00109   return ShouldLoad(aContentType, aContentLocation, aRequestingLocation,
00110                     aRequestingContext, aMimeGuess, aExtra, aDecision);
00111 }