content/browser/accessibility/site_per_process_accessibility_browsertest.cc

// Copyright (c) 2014 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 "base/command_line.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "content/browser/accessibility/browser_accessibility.h"
#include "content/browser/accessibility/browser_accessibility_manager.h"
#include "content/browser/accessibility/browser_accessibility_state_impl.h"
#include "content/browser/frame_host/cross_process_frame_connector.h"
#include "content/browser/frame_host/frame_tree.h"
#include "content/browser/frame_host/render_frame_proxy_host.h"
#include "content/browser/frame_host/render_widget_host_view_child_frame.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/site_per_process_browsertest.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_types.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/common/content_switches.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/content_browser_test_utils.h"
#include "content/public/test/test_utils.h"
#include "content/shell/browser/shell.h"
#include "content/test/accessibility_browser_test_utils.h"
#include "content/test/content_browser_test_utils_internal.h"
#include "net/dns/mock_host_resolver.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "url/gurl.h"
#include "url/url_constants.h"

// These tests time out on Android.
#if defined(OS_ANDROID)
#define MAYBE_SitePerProcessAccessibilityBrowserTest \
    DISABLED_SitePerProcessAccessibilityBrowserTest
#else
#define MAYBE_SitePerProcessAccessibilityBrowserTest \
    SitePerProcessAccessibilityBrowserTest
#endif

namespace content {

namespace {

// Searches recursively and returns true if any node's accessible name
// is equal to the given text.
bool AccessibilityTreeContainsText(BrowserAccessibility* node,
                                   const std::string& text) {
  if (node->GetStringAttribute(ui::AX_ATTR_NAME) == text)
    return true;
  for (unsigned i = 0; i < node->PlatformChildCount(); i++) {
    if (AccessibilityTreeContainsText(node->PlatformGetChild(i), text))
      return true;
  }
  return false;
}

}  // namespace

class MAYBE_SitePerProcessAccessibilityBrowserTest
    : public SitePerProcessBrowserTest {
 public:
  MAYBE_SitePerProcessAccessibilityBrowserTest() {}

  void LoadCrossSitePageIntoFrame(FrameTreeNode* frame_tree_node,
                                  const std::string& relative_url,
                                  const std::string& host) {
    // Load cross-site page into iframe.
    RenderFrameHostImpl* child_rfh =
        frame_tree_node->render_manager()->current_frame_host();
    RenderFrameDeletedObserver deleted_observer(child_rfh);
    GURL cross_site_url(embedded_test_server()->GetURL(host, relative_url));
    NavigateFrameToURL(frame_tree_node, cross_site_url);

    // Ensure that we have created a new process for the subframe.
    SiteInstance* site_instance =
        frame_tree_node->current_frame_host()->GetSiteInstance();
    EXPECT_NE(shell()->web_contents()->GetSiteInstance(), site_instance);

    // Wait until the iframe completes the swap.
    deleted_observer.WaitUntilDeleted();
  }

  // This is intended to be a robust way to assert that the accessibility
  // tree eventually gets into the correct state, without worrying about
  // the exact ordering of events received while getting there.
  //
  // Searches the accessibility tree to see if any node's accessible name
  // is equal to the given text. If not, sets up a notification waiter
  // that listens for any accessibility event in any frame, and checks again
  // after each event. Keeps looping until the text is found (or the
  // test times out).
  void WaitForAccessibilityTreeToContainText(const std::string& text) {
    RenderFrameHostImpl* main_frame = static_cast<RenderFrameHostImpl*>(
        shell()->web_contents()->GetMainFrame());
    BrowserAccessibilityManager* main_frame_manager =
        main_frame->browser_accessibility_manager();
    FrameTree* frame_tree =
        static_cast<WebContentsImpl*>(shell()->web_contents())->GetFrameTree();
    while (!AccessibilityTreeContainsText(
               main_frame_manager->GetRoot(), text)) {
      AccessibilityNotificationWaiter accessibility_waiter(main_frame,
                                                           ui::AX_EVENT_NONE);
      for (FrameTreeNode* node : frame_tree->Nodes())
        accessibility_waiter.ListenToAdditionalFrame(
            node->current_frame_host());

      accessibility_waiter.WaitForNotification();
    }
  }
};

IN_PROC_BROWSER_TEST_F(MAYBE_SitePerProcessAccessibilityBrowserTest,
                       CrossSiteIframeAccessibility) {
  // Enable full accessibility for all current and future WebContents.
  BrowserAccessibilityState::GetInstance()->EnableAccessibility();

  GURL main_url(embedded_test_server()->GetURL("/site_per_process_main.html"));
  NavigateToURL(shell(), main_url);

  // It is safe to obtain the root frame tree node here, as it doesn't change.
  FrameTreeNode* root =
      static_cast<WebContentsImpl*>(shell()->web_contents())->
          GetFrameTree()->root();

  // Load same-site page into iframe.
  FrameTreeNode* child = root->child_at(0);
  GURL http_url(embedded_test_server()->GetURL("/title1.html"));
  NavigateFrameToURL(child, http_url);

  // Load cross-site page into iframe and wait for text from that
  // page to appear in the accessibility tree.
  LoadCrossSitePageIntoFrame(child, "/title2.html", "foo.com");
  WaitForAccessibilityTreeToContainText("Title Of Awesomeness");

  RenderFrameHostImpl* main_frame = static_cast<RenderFrameHostImpl*>(
      shell()->web_contents()->GetMainFrame());
  BrowserAccessibilityManager* main_frame_manager =
      main_frame->browser_accessibility_manager();
  VLOG(1) << "Main frame accessibility tree:\n"
          << main_frame_manager->SnapshotAXTreeForTesting().ToString();

  // Assert that we can walk from the main frame down into the child frame
  // directly, getting correct roles and data along the way.
  BrowserAccessibility* ax_root = main_frame_manager->GetRoot();
  EXPECT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, ax_root->GetRole());
  ASSERT_EQ(1U, ax_root->PlatformChildCount());

  BrowserAccessibility* ax_group = ax_root->PlatformGetChild(0);
  EXPECT_EQ(ui::AX_ROLE_GROUP, ax_group->GetRole());
  ASSERT_EQ(2U, ax_group->PlatformChildCount());

  BrowserAccessibility* ax_iframe = ax_group->PlatformGetChild(0);
  EXPECT_EQ(ui::AX_ROLE_IFRAME, ax_iframe->GetRole());
  ASSERT_EQ(1U, ax_iframe->PlatformChildCount());

  BrowserAccessibility* ax_child_frame_root = ax_iframe->PlatformGetChild(0);
  EXPECT_EQ(ui::AX_ROLE_ROOT_WEB_AREA, ax_child_frame_root->GetRole());
  ASSERT_EQ(1U, ax_child_frame_root->PlatformChildCount());
  EXPECT_EQ("Title Of Awesomeness",
            ax_child_frame_root->GetStringAttribute(ui::AX_ATTR_NAME));

  BrowserAccessibility* ax_child_frame_group =
      ax_child_frame_root->PlatformGetChild(0);
  EXPECT_EQ(ui::AX_ROLE_GROUP, ax_child_frame_group->GetRole());
  ASSERT_EQ(1U, ax_child_frame_group->PlatformChildCount());

  BrowserAccessibility* ax_child_frame_static_text =
      ax_child_frame_group->PlatformGetChild(0);
  EXPECT_EQ(ui::AX_ROLE_STATIC_TEXT, ax_child_frame_static_text->GetRole());
  ASSERT_EQ(0U, ax_child_frame_static_text->PlatformChildCount());

  // Last, check that the parent of the child frame root is correct.
  EXPECT_EQ(ax_child_frame_root->GetParent(), ax_iframe);
}

IN_PROC_BROWSER_TEST_F(MAYBE_SitePerProcessAccessibilityBrowserTest,
                       TwoCrossSiteNavigations) {
  // Enable full accessibility for all current and future WebContents.
  BrowserAccessibilityState::GetInstance()->EnableAccessibility();

  GURL main_url(embedded_test_server()->GetURL("/site_per_process_main.html"));
  NavigateToURL(shell(), main_url);

  // It is safe to obtain the root frame tree node here, as it doesn't change.
  FrameTreeNode* root =
      static_cast<WebContentsImpl*>(shell()->web_contents())->
          GetFrameTree()->root();

  // Load first cross-site page into iframe and wait for text from that
  // page to appear in the accessibility tree.
  FrameTreeNode* child = root->child_at(0);
  LoadCrossSitePageIntoFrame(child, "/title1.html", "foo.com");
  WaitForAccessibilityTreeToContainText("This page has no title.");

  // Load second cross-site page into iframe and wait for text from that
  // page to appear in the accessibility tree. If this succeeds and doesn't
  // time out, the test passes.
  LoadCrossSitePageIntoFrame(child, "/title2.html", "bar.com");
  WaitForAccessibilityTreeToContainText("Title Of Awesomeness");
}

}  // namespace content