toolkit/components/browser/nsWebBrowserContentPolicy.cpp
author Christoph Kerschbaumer <ckerschb@christophkerschbaumer.com>
Thu, 29 Mar 2018 12:16:23 +0200
changeset 464211 22d7899c79f85237e8590843efd729e69996deb2
parent 374209 58c050e010a596a5cbb419472714d2d68b8906c2
child 471494 a31c1b8a41f81fb564bd86e1c22617595d61a42d
permissions -rw-r--r--
Bug 1439713 - Change nsIContentPolicy shouldLoad to take an <uri, loadInfo> pair instead of the various args. r=bz

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "nsWebBrowserContentPolicy.h"
#include "nsIDocShell.h"
#include "nsCOMPtr.h"
#include "nsContentPolicyUtils.h"
#include "nsIContentViewer.h"

nsWebBrowserContentPolicy::nsWebBrowserContentPolicy()
{
}

nsWebBrowserContentPolicy::~nsWebBrowserContentPolicy()
{
}

NS_IMPL_ISUPPORTS(nsWebBrowserContentPolicy, nsIContentPolicy)

NS_IMETHODIMP
nsWebBrowserContentPolicy::ShouldLoad(nsIURI* aContentLocation,
                                      nsILoadInfo* aLoadInfo,
                                      const nsACString& aMimeGuess,
                                      int16_t* aShouldLoad)
{
  NS_PRECONDITION(aShouldLoad, "Null out param");

  uint32_t aContentType = aLoadInfo->GetExternalContentPolicyType();
  nsCOMPtr<nsISupports> aRequestingContext = aLoadInfo->GetLoadingContext();

  MOZ_ASSERT(aContentType == nsContentUtils::InternalContentPolicyTypeToExternal(aContentType),
             "We should only see external content policy types here.");

  *aShouldLoad = nsIContentPolicy::ACCEPT;

  nsIDocShell* shell = NS_CP_GetDocShellFromContext(aRequestingContext);
  /* We're going to dereference shell, so make sure it isn't null */
  if (!shell) {
    return NS_OK;
  }

  nsresult rv;
  bool allowed = true;

  switch (aContentType) {
    case nsIContentPolicy::TYPE_SCRIPT:
      rv = shell->GetAllowJavascript(&allowed);
      break;
    case nsIContentPolicy::TYPE_SUBDOCUMENT:
      rv = shell->GetAllowSubframes(&allowed);
      break;
#if 0
    /* XXXtw: commented out in old code; add during conpol phase 2 */
    case nsIContentPolicy::TYPE_REFRESH:
      rv = shell->GetAllowMetaRedirects(&allowed); /* meta _refresh_ */
      break;
#endif
    case nsIContentPolicy::TYPE_IMAGE:
    case nsIContentPolicy::TYPE_IMAGESET:
      rv = shell->GetAllowImages(&allowed);
      break;
    default:
      return NS_OK;
  }

  if (NS_SUCCEEDED(rv) && !allowed) {
    *aShouldLoad = nsIContentPolicy::REJECT_TYPE;
  }
  return rv;
}

NS_IMETHODIMP
nsWebBrowserContentPolicy::ShouldProcess(nsIURI* aContentLocation,
                                         nsILoadInfo* aLoadInfo,
                                         const nsACString& aMimeGuess,
                                         int16_t* aShouldProcess)
{
  NS_PRECONDITION(aShouldProcess, "Null out param");

  uint32_t aContentType = aLoadInfo->GetExternalContentPolicyType();
  nsCOMPtr<nsISupports> aRequestingContext = aLoadInfo->GetLoadingContext();

  MOZ_ASSERT(aContentType == nsContentUtils::InternalContentPolicyTypeToExternal(aContentType),
             "We should only see external content policy types here.");

  *aShouldProcess = nsIContentPolicy::ACCEPT;

  // Object tags will always open channels with TYPE_OBJECT, but may end up
  // loading with TYPE_IMAGE or TYPE_DOCUMENT as their final type, so we block
  // actual-plugins at the process stage
  if (aContentType != nsIContentPolicy::TYPE_OBJECT) {
    return NS_OK;
  }

  nsIDocShell* shell = NS_CP_GetDocShellFromContext(aRequestingContext);
  if (shell && (!shell->PluginsAllowedInCurrentDoc())) {
    *aShouldProcess = nsIContentPolicy::REJECT_TYPE;
  }

  return NS_OK;
}