chrome/renderer/extensions/extension_process_policy.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/renderer/extensions/extension_process_policy.h"

#include "base/strings/string_util.h"
#include "chrome/common/extensions/extension_constants.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_set.h"
#include "extensions/common/manifest_handlers/app_isolation_info.h"
#include "extensions/common/switches.h"

namespace extensions {

const extensions::Extension* GetNonBookmarkAppExtension(
    const ExtensionSet& extensions,
    const GURL& url) {
  // Exclude bookmark apps, which do not use the app process model.
  const extensions::Extension* extension =
      extensions.GetExtensionOrAppByURL(url);
  if (extension && extension->from_bookmark())
    extension = NULL;
  return extension;
}

bool CrossesExtensionProcessBoundary(const ExtensionSet& extensions,
                                     const GURL& old_url,
                                     const GURL& new_url) {
  const extensions::Extension* old_url_extension =
      GetNonBookmarkAppExtension(extensions, old_url);
  const extensions::Extension* new_url_extension =
      GetNonBookmarkAppExtension(extensions, new_url);

  // If there are no extensions associated with either url, we check if the new
  // url points to an extension origin. If it does, fork - extension
  // installation should not be a factor.
  if (!old_url_extension && !new_url_extension) {
    // Hypothetically, we could also do an origin check here to make sure that
    // the two urls point two different extensions, but it's not really
    // necessary since we know there wasn't an associated extension with the old
    // url.
    return new_url.SchemeIs(kExtensionScheme);
  }

  return old_url_extension != new_url_extension;
}

}  // namespace extensions