Add device policies to control accessibility settings on the login screen

chrome/browser/chromeos/policy/login_screen_default_policy_browsertest.cc

+// Copyright (c) 2013 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 <string>
+
+#include "ash/magnifier/magnifier_constants.h"
+#include "base/basictypes.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/command_line.h"
+#include "base/compiler_specific.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/location.h"
+#include "base/message_loop.h"
+#include "base/prefs/pref_change_registrar.h"
+#include "base/prefs/pref_service.h"
+#include "base/run_loop.h"
+#include "base/values.h"
+#include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
+#include "chrome/browser/chromeos/accessibility/magnification_manager.h"
+#include "chrome/browser/chromeos/policy/device_policy_builder.h"
+#include "chrome/browser/chromeos/policy/device_policy_cros_browser_test.h"
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "chrome/browser/chromeos/settings/device_settings_service.h"
+#include "chrome/browser/lifetime/application_lifetime.h"
+#include "chrome/browser/policy/proto/chromeos/chrome_device_policy.pb.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/pref_names.h"
+#include "chromeos/chromeos_switches.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace em = enterprise_management;
+
+namespace policy {
+
+namespace {
+
+const em::AccessibilitySettingsProto_ScreenMagnifierType kFullScreenMagnifier =
+    em::AccessibilitySettingsProto_ScreenMagnifierType_SCREEN_MAGNIFIER_TYPE_FULL;
+
+// Spins the loop until a notification is received from |prefs| that the value
+// of |pref_name| has changed. If the notification is received before Wait()
+// has been called, Wait() returns immediately and no loop is spun.
+class PrefChangeWatcher {
+ public:
+  PrefChangeWatcher(const char* pref_name, PrefService* prefs);
+
+  void Wait();
+
+  void OnPrefChange();
+
+ private:
+  bool pref_changed_;
+
+  base::RunLoop run_loop_;
+  PrefChangeRegistrar registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefChangeWatcher);
+};
+
+PrefChangeWatcher::PrefChangeWatcher(const char* pref_name,
+                                     PrefService* prefs)
+    : pref_changed_(false) {
+  registrar_.Init(prefs);
+  registrar_.Add(pref_name, base::Bind(&PrefChangeWatcher::OnPrefChange,
+                                       base::Unretained(this)));
+}
+
+void PrefChangeWatcher::Wait() {
+  if (!pref_changed_)
+    run_loop_.Run();
+}
+
+void PrefChangeWatcher::OnPrefChange() {
+  pref_changed_ = true;
+  run_loop_.Quit();
+}
+
+}  // namespace
+
+class LoginScreenDefaultPolicyBrowsertestBase
+    : public DevicePolicyCrosBrowserTest {
+ protected:
+  LoginScreenDefaultPolicyBrowsertestBase();
+  virtual ~LoginScreenDefaultPolicyBrowsertestBase();
+
+  // DevicePolicyCrosBrowserTest:
+  virtual void SetUpInProcessBrowserTestFixture() OVERRIDE;
+  virtual void SetUpOnMainThread() OVERRIDE;
+
+  void RefreshDevicePolicyAndWaitForPrefChange(const char* pref_name);
+
+  Profile* login_profile_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LoginScreenDefaultPolicyBrowsertestBase);
+};
+
+class LoginScreenDefaultPolicyLoginScreenBrowsertest
+    : public LoginScreenDefaultPolicyBrowsertestBase {
+ protected:
+  LoginScreenDefaultPolicyLoginScreenBrowsertest();
+  virtual ~LoginScreenDefaultPolicyLoginScreenBrowsertest();
+
+  // LoginScreenDefaultPolicyBrowsertestBase:
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
+  virtual void SetUpOnMainThread() OVERRIDE;
+  virtual void CleanUpOnMainThread() OVERRIDE;
+
+  void VerifyPrefFollowsRecommendation(const char* pref_name,
+                                       const base::Value& recommended_value);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LoginScreenDefaultPolicyLoginScreenBrowsertest);
+};
+
+class LoginScreenDefaultPolicyInSessionBrowsertest
+    : public LoginScreenDefaultPolicyBrowsertestBase {
+ protected:
+  LoginScreenDefaultPolicyInSessionBrowsertest();
+  virtual ~LoginScreenDefaultPolicyInSessionBrowsertest();
+
+  // LoginScreenDefaultPolicyBrowsertestBase:
+  virtual void SetUpOnMainThread() OVERRIDE;
+
+  void VerifyPrefFollowsDefault(const char* pref_name);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(LoginScreenDefaultPolicyInSessionBrowsertest);
+};
+
+LoginScreenDefaultPolicyBrowsertestBase::
+    LoginScreenDefaultPolicyBrowsertestBase() : login_profile_(NULL) {
+}
+
+LoginScreenDefaultPolicyBrowsertestBase::
+    ~LoginScreenDefaultPolicyBrowsertestBase() {
+}
+
+void LoginScreenDefaultPolicyBrowsertestBase::
+    SetUpInProcessBrowserTestFixture() {
+  InstallOwnerKey();
+  MarkAsEnterpriseOwned(&temp_dir_);
+  DevicePolicyCrosBrowserTest::SetUpInProcessBrowserTestFixture();
+}
+
+void LoginScreenDefaultPolicyBrowsertestBase::SetUpOnMainThread() {
+  DevicePolicyCrosBrowserTest::SetUpOnMainThread();
+  login_profile_ = chromeos::ProfileHelper::GetSigninProfile();
+  ASSERT_TRUE(login_profile_);
+}
+
+void LoginScreenDefaultPolicyBrowsertestBase::
+    RefreshDevicePolicyAndWaitForPrefChange(const char* pref_name) {
+  PrefChangeWatcher watcher(pref_name, login_profile_->GetPrefs());
+  RefreshDevicePolicy();
+  watcher.Wait();
+}
+
+LoginScreenDefaultPolicyLoginScreenBrowsertest::
+    LoginScreenDefaultPolicyLoginScreenBrowsertest() {
+}
+
+LoginScreenDefaultPolicyLoginScreenBrowsertest::
+    ~LoginScreenDefaultPolicyLoginScreenBrowsertest() {
+}
+
+void LoginScreenDefaultPolicyLoginScreenBrowsertest::SetUpCommandLine(
+    CommandLine* command_line) {
+  LoginScreenDefaultPolicyBrowsertestBase::SetUpCommandLine(command_line);
+  command_line->AppendSwitch(chromeos::switches::kLoginManager);
+  command_line->AppendSwitch(chromeos::switches::kForceLoginManagerInTests);
+}
+
+void LoginScreenDefaultPolicyLoginScreenBrowsertest::SetUpOnMainThread() {
+  LoginScreenDefaultPolicyBrowsertestBase::SetUpOnMainThread();
+
+  // Set the login screen profile.
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  ASSERT_TRUE(accessibility_manager);
+  accessibility_manager->SetProfileForTest(
+      chromeos::ProfileHelper::GetSigninProfile());
+
+  chromeos::MagnificationManager* magnification_manager =
+      chromeos::MagnificationManager::Get();
+  ASSERT_TRUE(magnification_manager);
+  magnification_manager->SetProfileForTest(
+      chromeos::ProfileHelper::GetSigninProfile());
+}
+
+void LoginScreenDefaultPolicyLoginScreenBrowsertest::CleanUpOnMainThread() {
+  base::MessageLoop::current()->PostTask(FROM_HERE,
+                                         base::Bind(&chrome::AttemptExit));
+  base::RunLoop().RunUntilIdle();
+  LoginScreenDefaultPolicyBrowsertestBase::CleanUpOnMainThread();
+}
+
+void LoginScreenDefaultPolicyLoginScreenBrowsertest::
+    VerifyPrefFollowsRecommendation(const char* pref_name,
+                                    const base::Value& recommended_value) {
+  const PrefService::Preference* pref =
+      login_profile_->GetPrefs()->FindPreference(pref_name);
+  ASSERT_TRUE(pref);
+  EXPECT_FALSE(pref->IsManaged());
+  EXPECT_FALSE(pref->IsDefaultValue());
+  EXPECT_TRUE(base::Value::Equals(&recommended_value, pref->GetValue()));
+  EXPECT_TRUE(base::Value::Equals(&recommended_value,
+                                  pref->GetRecommendedValue()));
+}
+
+LoginScreenDefaultPolicyInSessionBrowsertest::
+    LoginScreenDefaultPolicyInSessionBrowsertest() {
+}
+
+LoginScreenDefaultPolicyInSessionBrowsertest::
+    ~LoginScreenDefaultPolicyInSessionBrowsertest() {
+}
+
+void LoginScreenDefaultPolicyInSessionBrowsertest::SetUpOnMainThread() {
+  LoginScreenDefaultPolicyBrowsertestBase::SetUpOnMainThread();
+
+  // Tell the DeviceSettingsService that there is no local owner.
+  chromeos::DeviceSettingsService::Get()->SetUsername(std::string());
+}
+
+void LoginScreenDefaultPolicyInSessionBrowsertest::VerifyPrefFollowsDefault(
+    const char* pref_name) {
+  Profile* profile = ProfileManager::GetDefaultProfile();
+  ASSERT_TRUE(profile);
+  const PrefService::Preference* pref =
+      profile->GetPrefs()->FindPreference(pref_name);
+  ASSERT_TRUE(pref);
+  EXPECT_FALSE(pref->IsManaged());
+  EXPECT_TRUE(pref->IsDefaultValue());
+  EXPECT_FALSE(pref->GetRecommendedValue());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
+                       DeviceLoginScreenDefaultLargeCursorEnabled) {
+  // Verifies that the default state of the large cursor accessibility feature
+  // on the login screen can be controlled through device policy.
+
+  // Enable the large cursor through device policy and wait for the change to
+  // take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_large_cursor_enabled(true);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kLargeCursorEnabled);
+
+  // Verify that the pref which controls the large cursor in the login profile
+  // has changed to the policy-supplied default.
+  VerifyPrefFollowsRecommendation(prefs::kLargeCursorEnabled,
+                                  base::FundamentalValue(true));
+
+  // Verify that the large cursor is enabled.
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  ASSERT_TRUE(accessibility_manager);
+  EXPECT_TRUE(accessibility_manager->IsLargeCursorEnabled());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
+                       DeviceLoginScreenDefaultSpokenFeedbackEnabled) {
+  // Verifies that the default state of the spoken feedback accessibility
+  // feature on the login screen can be controlled through device policy.
+
+  // Enable spoken feedback through device policy and wait for the change to
+  // take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_spoken_feedback_enabled(true);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kSpokenFeedbackEnabled);
+
+  // Verify that the pref which controls spoken feedback in the login profile
+  // has changed to the policy-supplied default.
+  VerifyPrefFollowsRecommendation(prefs::kSpokenFeedbackEnabled,
+                                  base::FundamentalValue(true));
+
+  // Verify that spoken feedback is enabled.
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  ASSERT_TRUE(accessibility_manager);
+  EXPECT_TRUE(accessibility_manager->IsSpokenFeedbackEnabled());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
+                       DeviceLoginScreenDefaultHighContrastEnabled) {
+  // Verifies that the default state of the high contrast mode accessibility
+  // feature on the login screen can be controlled through device policy.
+
+  // Enable high contrast mode through device policy and wait for the change to
+  // take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_high_contrast_enabled(true);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kHighContrastEnabled);
+
+  // Verify that the pref which controls high contrast mode in the login profile
+  // has changed to the policy-supplied default.
+  VerifyPrefFollowsRecommendation(prefs::kHighContrastEnabled,
+                                  base::FundamentalValue(true));
+
+  // Verify that high contrast mode is enabled.
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  ASSERT_TRUE(accessibility_manager);
+  EXPECT_TRUE(accessibility_manager->IsHighContrastEnabled());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyLoginScreenBrowsertest,
+                       DeviceLoginScreenDefaultScreenMagnifierType) {
+  // Verifies that the default screen magnifier type enabled on the login screen
+  // can be controlled through device policy.
+
+  // Set the screen magnifier type through device policy and wait for the change
+  // to take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_screen_magnifier_type(kFullScreenMagnifier);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kScreenMagnifierType);
+
+  // Verify that the prefs which control the screen magnifier type have changed
+  // to the policy-supplied default.
+  VerifyPrefFollowsRecommendation(prefs::kScreenMagnifierEnabled,
+                                  base::FundamentalValue(true));
+  VerifyPrefFollowsRecommendation(prefs::kScreenMagnifierType,
+                                  base::FundamentalValue(ash::MAGNIFIER_FULL));
+
+  // Verify that the full-screen magnifier is enabled.
+  chromeos::MagnificationManager* magnification_manager =
+      chromeos::MagnificationManager::Get();
+  ASSERT_TRUE(magnification_manager);
+  EXPECT_TRUE(magnification_manager->IsMagnifierEnabled());
+  EXPECT_EQ(ash::MAGNIFIER_FULL, magnification_manager->GetMagnifierType());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
+                       DeviceLoginScreenDefaultLargeCursorEnabled) {
+  // Verifies that changing the default state of the large cursor accessibility
+  // feature on the login screen through policy does not affect its state in a
+  // session.
+
+  // Enable the large cursor through device policy and wait for the change to
+  // take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_large_cursor_enabled(true);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kLargeCursorEnabled);
+
+  // Verify that the pref which controls the large cursor in the session is
+  // unchanged.
+  VerifyPrefFollowsDefault(prefs::kLargeCursorEnabled);
+
+  // Verify that the large cursor is disabled.
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  ASSERT_TRUE(accessibility_manager);
+  EXPECT_FALSE(accessibility_manager->IsLargeCursorEnabled());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
+                       DeviceLoginScreenDefaultSpokenFeedbackEnabled) {
+  // Verifies that changing the default state of the spoken feedback
+  // accessibility feature on the login screen through policy does not affect
+  // its state in a session.
+
+  // Enable spoken feedback through device policy and wait for the change to
+  // take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_spoken_feedback_enabled(true);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kSpokenFeedbackEnabled);
+
+  // Verify that the pref which controls the spoken feedback in the session is
+  // unchanged.
+  VerifyPrefFollowsDefault(prefs::kSpokenFeedbackEnabled);
+
+  // Verify that spoken feedback is disabled.
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  ASSERT_TRUE(accessibility_manager);
+  EXPECT_FALSE(accessibility_manager->IsSpokenFeedbackEnabled());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
+                       DeviceLoginScreenDefaultHighContrastEnabled) {
+  // Verifies that changing the default state of the high contrast mode
+  // accessibility feature on the login screen through policy does not affect
+  // its state in a session.
+
+  // Enable high contrast mode through device policy and wait for the change to
+  // take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_high_contrast_enabled(true);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kHighContrastEnabled);
+
+  // Verify that the pref which controls high contrast mode in the session is
+  // unchanged.
+  VerifyPrefFollowsDefault(prefs::kHighContrastEnabled);
+
+  // Verify that high contrast mode is disabled.
+  chromeos::AccessibilityManager* accessibility_manager =
+      chromeos::AccessibilityManager::Get();
+  ASSERT_TRUE(accessibility_manager);
+  EXPECT_FALSE(accessibility_manager->IsHighContrastEnabled());
+}
+
+IN_PROC_BROWSER_TEST_F(LoginScreenDefaultPolicyInSessionBrowsertest,
+                       DeviceLoginScreenDefaultScreenMagnifierType) {
+  // Verifies that changing the default screen magnifier type enabled on the
+  // login screen through policy does not affect its state in a session.
+
+  // Set the screen magnifier type through device policy and wait for the change
+  // to take effect.
+  em::ChromeDeviceSettingsProto& proto(device_policy()->payload());
+  proto.mutable_accessibility_settings()->
+      set_login_screen_default_screen_magnifier_type(kFullScreenMagnifier);
+  RefreshDevicePolicyAndWaitForPrefChange(prefs::kScreenMagnifierType);
+
+  // Verify that the prefs which control the screen magnifier in the session are
+  // unchanged.
+  VerifyPrefFollowsDefault(prefs::kScreenMagnifierEnabled);
+  VerifyPrefFollowsDefault(prefs::kScreenMagnifierType);
+
+  // Verify that the screen magnifier is disabled.
+  chromeos::MagnificationManager* magnification_manager =
+      chromeos::MagnificationManager::Get();
+  ASSERT_TRUE(magnification_manager);
+  EXPECT_FALSE(magnification_manager->IsMagnifierEnabled());
+  EXPECT_EQ(ash::kDefaultMagnifierType,
+            magnification_manager->GetMagnifierType());
+}
+
+} // namespace policy