Introduce lock screen app manager

chrome/browser/chromeos/lock_screen_apps/app_manager_impl.cc

Index: chrome/browser/chromeos/lock_screen_apps/app_manager_impl.cc
diff --git a/chrome/browser/chromeos/lock_screen_apps/app_manager_impl.cc b/chrome/browser/chromeos/lock_screen_apps/app_manager_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e68e588c22420588951f1d46cd7ebeeda257a78d
--- /dev/null
+++ b/chrome/browser/chromeos/lock_screen_apps/app_manager_impl.cc
@@ -0,0 +1,230 @@
+// Copyright 2017 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/browser/chromeos/lock_screen_apps/app_manager_impl.h"
+
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "apps/launcher.h"
+#include "base/bind.h"
+#include "base/files/file_path.h"
+#include "base/memory/ptr_util.h"
+#include "base/memory/ref_counted.h"
+#include "base/strings/string16.h"
+#include "chrome/browser/chromeos/note_taking_helper.h"
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/common/pref_names.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/common/api/app_runtime.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/extension_set.h"
+
+namespace lock_screen_apps {
+
+AppManagerImpl::AppManagerImpl() : extensions_observer_(this) {}
+
+AppManagerImpl::~AppManagerImpl() = default;
+
+void AppManagerImpl::Initialize(Profile* primary_profile,
+                                Profile* lock_screen_profile) {
+  DCHECK_EQ(State::kNotInitialized, state_);
+  DCHECK(primary_profile);
+  DCHECK(lock_screen_profile);
+  DCHECK_NE(primary_profile, lock_screen_profile);
+
+  CHECK(!chromeos::ProfileHelper::Get()->GetUserByProfile(lock_screen_profile))
+      << "Lock screen profile should not be associated with any users.";
+
+  primary_profile_ = primary_profile;
+  lock_screen_profile_ = lock_screen_profile;
+  state_ = State::kInactive;
+
+  pref_change_registrar_.Init(primary_profile->GetPrefs());
+  pref_change_registrar_.Add(
+      prefs::kNoteTakingAppId,
+      base::Bind(&AppManagerImpl::OnNoteTakingExtensionChanged,
+                 base::Unretained(this)));
+  pref_change_registrar_.Add(
+      prefs::kNoteTakingAppEnabledOnLockScreen,
+      base::Bind(&AppManagerImpl::OnNoteTakingExtensionChanged,
+                 base::Unretained(this)));
+}
+
+void AppManagerImpl::Start(AppManager::Observer* observer) {
+  DCHECK_NE(State::kNotInitialized, state_);
+
+  observer_ = observer;
+  extensions_observer_.Add(
+      extensions::ExtensionRegistry::Get(primary_profile_));
+
+  if (state_ == State::kActive)
+    return;
+
+  lock_screen_app_id_.clear();
+  std::string app_id = FindLockScreenNoteTakingApp();
+  if (!app_id.empty() && AddAppToLockScreenProfile(app_id))
+    lock_screen_app_id_ = app_id;
+
+  state_ = State::kActive;
+}
+
+void AppManagerImpl::Stop() {
+  DCHECK_NE(State::kNotInitialized, state_);
+
+  observer_ = nullptr;
+  extensions_observer_.RemoveAll();
+
+  if (state_ == State::kInactive)
+    return;
+
+  UnloadLockApp(lock_screen_app_id_);
+  lock_screen_app_id_.clear();
+  state_ = State::kInactive;
+}
+
+bool AppManagerImpl::IsNoteTakingAppAvailable() const {
+  return state_ == State::kActive && !lock_screen_app_id_.empty();
+}
+
+std::string AppManagerImpl::GetNoteTakingAppId() const {
+  if (!IsNoteTakingAppAvailable())
+    return std::string();
+  return lock_screen_app_id_;
+}
+
+bool AppManagerImpl::LaunchNoteTaking() {
+  if (!IsNoteTakingAppAvailable())
+    return false;
+
+  Profile* target_profile = lock_screen_profile_->GetOriginalProfile();
+  const extensions::ExtensionRegistry* extension_registry =
+      extensions::ExtensionRegistry::Get(target_profile);
+  const extensions::Extension* app = extension_registry->GetExtensionById(
+      lock_screen_app_id_, extensions::ExtensionRegistry::ENABLED);
+  if (!app)
+    return false;
+
+  auto action_data =
+      base::MakeUnique<extensions::api::app_runtime::ActionData>();
+  action_data->action_type =
+      extensions::api::app_runtime::ActionType::ACTION_TYPE_NEW_NOTE;
+  apps::LaunchPlatformAppWithAction(target_profile, app, std::move(action_data),
+                                    base::FilePath());
+  return true;
+}
+
+void AppManagerImpl::OnExtensionLoaded(content::BrowserContext* browser_context,
+                                       const extensions::Extension* extension) {
+  if (extension->id() ==
+      primary_profile_->GetPrefs()->GetString(prefs::kNoteTakingAppId)) {
+    OnNoteTakingExtensionChanged();
+  }
+}
+
+void AppManagerImpl::OnExtensionUnloaded(
+    content::BrowserContext* browser_context,
+    const extensions::Extension* extension,
+    extensions::UnloadedExtensionReason reason) {
+  if (extension->id() == lock_screen_app_id_)
+    OnNoteTakingExtensionChanged();
+}
+
+void AppManagerImpl::OnNoteTakingExtensionChanged() {
+  if (state_ != State::kActive)
+    return;
+  std::string app_id = FindLockScreenNoteTakingApp();
+  if (app_id == lock_screen_app_id_)
+    return;
+
+  UnloadLockApp(lock_screen_app_id_);
+  lock_screen_app_id_.clear();
+
+  if (AddAppToLockScreenProfile(app_id))
+    lock_screen_app_id_ = app_id;
+
+  observer_->OnNoteTakingAvailabilityChanged();
+}
+
+std::string AppManagerImpl::FindLockScreenNoteTakingApp() const {
+  // Note that lock screen does not currently support Android apps, so
+  // it's enough to only check the state of the preferred Chrome app.
+  std::unique_ptr<chromeos::NoteTakingAppInfo> note_taking_app =
+      chromeos::NoteTakingHelper::Get()->GetPreferredChromeAppInfo(
+          primary_profile_);
+
+  if (!note_taking_app ||
+      note_taking_app->lock_screen_support !=
+          chromeos::NoteTakingLockScreenSupport::kSelected) {
+    return std::string();
+  }
+
+  return note_taking_app->app_id;
+}
+
+bool AppManagerImpl::AddAppToLockScreenProfile(const std::string& app_id) {
+  extensions::ExtensionRegistry* primary_registry =
+      extensions::ExtensionRegistry::Get(primary_profile_);
+  const extensions::Extension* app =
+      primary_registry->enabled_extensions().GetByID(app_id);
+  if (!app)
+    return false;
+
+  extensions::ExtensionRegistry* lock_screen_registry =
+      extensions::ExtensionRegistry::Get(lock_screen_profile_);
+  const extensions::Extension* lock_app =
+      lock_screen_registry->GetExtensionById(
+          app_id, extensions::ExtensionRegistry::EVERYTHING);
+  if (lock_app && !lock_app->runs_on_lock_screen()) {
+    LOG(ERROR) << "Non lock screen enabled app already installed in profile.";
+    return false;
+  }
+
+  ExtensionService* lock_screen_service =
+      extensions::ExtensionSystem::Get(lock_screen_profile_)
+          ->extension_service();
+  if (lock_app) {
+    lock_screen_service->UnloadExtension(
+        app_id, extensions::UnloadedExtensionReason::UNINSTALL);
+  }
+
+  // TODO(tbarzic): Instead of loading the app from user profile path, consider
+  // copying and installing the app to the target profile.
+  std::string error;
+  scoped_refptr<extensions::Extension> lock_profile_app =
+      extensions::Extension::Create(
+          app->path(), app->location(),
+          *app->manifest()->value()->CreateDeepCopy(),
+          app->creation_flags() | extensions::Extension::RUNS_ON_LOCK_SCREEN,
+          app->id(), &error);
+
+  if (!lock_profile_app)
+    return false;
+
+  lock_screen_service->AddExtension(lock_profile_app.get());
+  lock_screen_service->EnableExtension(lock_profile_app->id());
+  return true;
+}
+
+void AppManagerImpl::UnloadLockApp(const std::string& app_id) {
+  if (app_id.empty())
+    return;
+
+  extensions::ExtensionRegistry* lock_screen_registry =
+      extensions::ExtensionRegistry::Get(lock_screen_profile_);
+  const extensions::Extension* lock_app =
+      lock_screen_registry->GetExtensionById(
+          app_id, extensions::ExtensionRegistry::EVERYTHING);
+  if (!lock_app)
+    return;
+
+  extensions::ExtensionSystem::Get(lock_screen_profile_)
+      ->extension_service()
+      ->UnloadExtension(app_id, extensions::UnloadedExtensionReason::UNINSTALL);
+}
+
+}  // namespace lock_screen_apps