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nsDataDocumentContentPolicy.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The contents of this file are subject to the Mozilla Public License Version
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 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Boris Zbarsky <bzbarsky@mit.edu>.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
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/*
 * Content policy implementation that prevents all loads of images,
 * subframes, etc from documents loaded as data (eg documents loaded
 * via XMLHttpRequest).
 */

#include "nsDataDocumentContentPolicy.h"
#include "nsIDocument.h"
#include "nsINode.h"
#include "nsIDOMWindow.h"
#include "nsIDOMDocument.h"

NS_IMPL_ISUPPORTS1(nsDataDocumentContentPolicy, nsIContentPolicy)

NS_IMETHODIMP
nsDataDocumentContentPolicy::ShouldLoad(PRUint32 aContentType,
                                        nsIURI *aContentLocation,
                                        nsIURI *aRequestingLocation,
                                        nsISupports *aRequestingContext,
                                        const nsACString &aMimeGuess,
                                        nsISupports *aExtra,
                                        PRInt16 *aDecision)
{
  *aDecision = nsIContentPolicy::ACCEPT;
  // Look for the document.  In most cases, aRequestingContext is a node.
  nsCOMPtr<nsIDocument> doc;
  nsCOMPtr<nsINode> node = do_QueryInterface(aRequestingContext);
  if (node) {
    doc = node->GetOwnerDoc();
  } else {
    nsCOMPtr<nsIDOMWindow> window = do_QueryInterface(aRequestingContext);
    if (window) {
      nsCOMPtr<nsIDOMDocument> domDoc;
      window->GetDocument(getter_AddRefs(domDoc));
      doc = do_QueryInterface(domDoc);
    }
  }
  if (aContentType != nsIContentPolicy::TYPE_DTD && doc && doc->IsLoadedAsData()) {
    *aDecision = nsIContentPolicy::REJECT_TYPE;
  }

  return NS_OK;
}

NS_IMETHODIMP
nsDataDocumentContentPolicy::ShouldProcess(PRUint32 aContentType,
                                           nsIURI *aContentLocation,
                                           nsIURI *aRequestingLocation,
                                           nsISupports *aRequestingContext,
                                           const nsACString &aMimeGuess,
                                           nsISupports *aExtra,
                                           PRInt16 *aDecision)
{
  return ShouldLoad(aContentType, aContentLocation, aRequestingLocation,
                    aRequestingContext, aMimeGuess, aExtra, aDecision);
}

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