Add ash::VPNDelegate and Chrome OS implementation

chrome/browser/ui/ash/vpn_delegate_chromeos.cc

Index: chrome/browser/ui/ash/vpn_delegate_chromeos.cc
diff --git a/chrome/browser/ui/ash/vpn_delegate_chromeos.cc b/chrome/browser/ui/ash/vpn_delegate_chromeos.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1f29f746e0888d9ac83bbe88b70f3ebaf1b66a05
--- /dev/null
+++ b/chrome/browser/ui/ash/vpn_delegate_chromeos.cc
@@ -0,0 +1,164 @@
+// Copyright 2015 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/ui/ash/vpn_delegate_chromeos.h"
+
+#include <vector>
+
+#include "ash/shell.h"
+#include "ash/system/tray/system_tray_delegate.h"
+#include "base/logging.h"
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#include "chrome/browser/profiles/profile.h"
+#include "components/user_manager/user.h"
+#include "components/user_manager/user_manager.h"
+#include "content/public/browser/notification_service.h"
+#include "extensions/browser/api/vpn_provider/vpn_service.h"
+#include "extensions/browser/api/vpn_provider/vpn_service_factory.h"
+#include "extensions/browser/extension_registry.h"
+#include "extensions/common/extension.h"
+#include "extensions/common/extension_set.h"
+#include "extensions/common/permissions/api_permission.h"
+#include "extensions/common/permissions/permissions_data.h"
+#include "third_party/cros_system_api/dbus/service_constants.h"
+
+namespace {
+
+bool IsVPNProvider(const extensions::Extension* extension) {
+  return extension->permissions_data()->HasAPIPermission(
+             extensions::APIPermission::kVpnProvider);
+}
+
+Profile* GetProfileForPrimaryUser() {
+  const user_manager::User* const primary_user =
+      user_manager::UserManager::Get()->GetPrimaryUser();
+  if (!primary_user)
+    return nullptr;
+
+  return chromeos::ProfileHelper::Get()->GetProfileByUser(primary_user);
+}
+
+const extensions::ExtensionSet* GetExtensionsForPrimaryUser() {
+  Profile* const profile = GetProfileForPrimaryUser();
+  if (!profile)
+    return nullptr;
+
+  const extensions::ExtensionRegistry* const extension_registry =
+      extensions::ExtensionRegistry::Get(profile);
+  if (!extension_registry)
+    return nullptr;
+
+  return &extension_registry->enabled_extensions();
+}
+
+}  // namespace
+
+VPNDelegateChromeOS::VPNDelegateChromeOS() {
+  if (user_manager::UserManager::Get()->GetPrimaryUser()) {
+    // If a user is logged in, start observing the primary user's extension
+    // registry immediately.
+    AttachToPrimaryUserExtensionRegistry();
+  } else {
+    // If no user is logged in, wait for the first user to log in and become the
+    // primary user.
+    registrar_.Add(this,
+                   chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED,
+                   content::NotificationService::AllSources());
+  }
+}
+
+VPNDelegateChromeOS::~VPNDelegateChromeOS() {
+  if (extension_registry_)
+    extension_registry_->RemoveObserver(this);
+}
+
+bool VPNDelegateChromeOS::HaveThirdPartyVPNProviders() const {
+  const extensions::ExtensionSet* const extensions =
+      GetExtensionsForPrimaryUser();
+  if (!extensions)
+    return false;
+
+  for (const auto& extension : *extensions) {
+    if (IsVPNProvider(extension.get()))
+      return true;
+  }
+
+  return false;
+}
+
+std::vector<ash::VPNProvider>
+VPNDelegateChromeOS::GetThirdPartyVPNProviders() const {
+  const extensions::ExtensionSet* const extensions =
+      GetExtensionsForPrimaryUser();
+  if (!extensions)
+    return std::vector<ash::VPNProvider>();
+
+  std::vector<ash::VPNProvider> third_party_vpn_providers;
+  for (const auto& extension : *extensions) {
+    if (IsVPNProvider(extension.get())) {
+      third_party_vpn_providers.push_back(ash::VPNProvider(extension->name(),
+                                                           extension->id()));
+    }
+  }
+
+  return third_party_vpn_providers;
+}
+
+void VPNDelegateChromeOS::ShowAddPage(const std::string& id) {
+  if (id.empty()) {
+    // If |id| is an empty string, show the built-in dialog for adding an
+    // OpenVPN or L2TP VPN.
+    ash::Shell::GetInstance()->system_tray_delegate()->ShowOtherNetworkDialog(
+        shill::kTypeVPN);
+    return;
+  }
+
+  Profile* const profile = GetProfileForPrimaryUser();
+  if (!profile)
+    return;
+
+  // Request that the third-party VPN provider identified by |id| show its "add
+  // network" dialog.
+  chromeos::VpnServiceFactory::GetForBrowserContext(profile)->TriggerAdd(id);
+}
+
+void VPNDelegateChromeOS::OnExtensionLoaded(
+    content::BrowserContext* browser_context,
+    const extensions::Extension* extension) {
+  NotifyObservers();

[Daniel Erat, 2015/03/09 19:46:19]

do you want to call IsVPNProvider() here to avoid notifying observers
unnecessarily?

[bartfab (slow), 2015/03/09 21:04:23]

Excellent idea. Done.

+}
+
+void VPNDelegateChromeOS::OnExtensionUnloaded(
+    content::BrowserContext* browser_context,
+    const extensions::Extension* extension,
+    extensions::UnloadedExtensionInfo::Reason reason) {
+  NotifyObservers();

[Daniel Erat, 2015/03/09 19:46:19]

same here

[bartfab (slow), 2015/03/09 21:04:23]

Done.

+}
+
+void VPNDelegateChromeOS::OnShutdown(extensions::ExtensionRegistry* registry) {
+  DCHECK(extension_registry_);
+  extension_registry_->RemoveObserver(this);
+  extension_registry_ = nullptr;
+}
+
+void VPNDelegateChromeOS::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  // A user has logged in and become the primary user. Stop watching user logins
+  // and start observing the primary user's extension registry.
+  DCHECK_EQ(chrome::NOTIFICATION_LOGIN_USER_PROFILE_PREPARED, type);
+  registrar_.RemoveAll();
+  AttachToPrimaryUserExtensionRegistry();
+
+}
+
+void VPNDelegateChromeOS::AttachToPrimaryUserExtensionRegistry() {
+  DCHECK(!extension_registry_);
+  extension_registry_ = extensions::ExtensionRegistry::Get(
+      chromeos::ProfileHelper::Get()->GetProfileByUser(
+          user_manager::UserManager::Get()->GetPrimaryUser()));
+  extension_registry_->AddObserver(this);
+}