dom/base/nsNoDataProtocolContentPolicy.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /*
   8  * Content policy implementation that prevents all loads of images,
   9  * subframes, etc from protocols that don't return data but rather open
  10  * applications (such as mailto).
  11  */
  12
  13 #include "nsNoDataProtocolContentPolicy.h"
  14 #include "nsString.h"
  15 #include "nsIProtocolHandler.h"
  16 #include "nsIURI.h"
  17 #include "nsNetUtil.h"
  18 #include "nsContentUtils.h"
  19
  20 NS_IMPL_ISUPPORTS(nsNoDataProtocolContentPolicy, nsIContentPolicy)
  21
  22 NS_IMETHODIMP
  23 nsNoDataProtocolContentPolicy::ShouldLoad(nsIURI* aContentLocation,
  24                                           nsILoadInfo* aLoadInfo,
  25                                           const nsACString& aMimeGuess,
  26                                           int16_t* aDecision) {
  27   ExtContentPolicyType contentType = aLoadInfo->GetExternalContentPolicyType();
  28
  29   *aDecision = nsIContentPolicy::ACCEPT;
  30
  31   // Don't block for TYPE_OBJECT since such URIs are sometimes loaded by the
  32   // plugin, so they don't necessarily open external apps
  33   // TYPE_WEBSOCKET loads can only go to ws:// or wss://, so we don't need to
  34   // concern ourselves with them.
  35   if (contentType != ExtContentPolicy::TYPE_DOCUMENT &&
  36       contentType != ExtContentPolicy::TYPE_SUBDOCUMENT &&
  37       contentType != ExtContentPolicy::TYPE_OBJECT &&
  38       contentType != ExtContentPolicy::TYPE_WEBSOCKET) {
  39     // The following are just quick-escapes for the most common cases
  40     // where we would allow the content to be loaded anyway.
  41     nsAutoCString scheme;
  42     aContentLocation->GetScheme(scheme);
  43     if (scheme.EqualsLiteral("http") || scheme.EqualsLiteral("https") ||
  44         scheme.EqualsLiteral("ftp") || scheme.EqualsLiteral("file") ||
  45         scheme.EqualsLiteral("chrome")) {
  46       return NS_OK;
  47     }
  48
  49     if (nsContentUtils::IsExternalProtocol(aContentLocation)) {
  50       NS_SetRequestBlockingReason(
  51           aLoadInfo,
  52           nsILoadInfo::BLOCKING_REASON_CONTENT_POLICY_NO_DATA_PROTOCOL);
  53       *aDecision = nsIContentPolicy::REJECT_REQUEST;
  54     }
  55   }
  56
  57   return NS_OK;
  58 }
  59
  60 NS_IMETHODIMP
  61 nsNoDataProtocolContentPolicy::ShouldProcess(nsIURI* aContentLocation,
  62                                              nsILoadInfo* aLoadInfo,
  63                                              const nsACString& aMimeGuess,
  64                                              int16_t* aDecision) {
  65   return ShouldLoad(aContentLocation, aLoadInfo, aMimeGuess, aDecision);
  66 }