Cleanup extension permissions module.

chrome/browser/extensions/permissions_updater.cc

Index: chrome/browser/extensions/permissions_updater.cc
diff --git a/chrome/browser/extensions/permissions_updater.cc b/chrome/browser/extensions/permissions_updater.cc
new file mode 100644
index 0000000000000000000000000000000000000000..eb79b70e4a6551d20f0e0d6dd1879a41874b6bb2
--- /dev/null
+++ b/chrome/browser/extensions/permissions_updater.cc
@@ -0,0 +1,155 @@
+// 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/browser/extensions/permissions_updater.h"
+
+#include "base/json/json_writer.h"
+#include "base/memory/ref_counted.h"
+#include "base/values.h"
+#include "chrome/browser/extensions/extension_event_router.h"
+#include "chrome/browser/extensions/extension_permissions_api_helpers.h"
+#include "chrome/browser/extensions/extension_prefs.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/extension_messages.h"
+#include "chrome/common/extensions/extension_permission_set.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/render_process_host.h"
+
+using content::RenderProcessHost;
+using extensions::permissions_api::PackPermissionsToValue;
+
+namespace extensions {
+
+namespace {
+
+const char kOnAdded[] = "permissions.onAdded";
+const char kOnRemoved[] = "permissions.onRemoved";
+
+}
+
+PermissionsUpdater::PermissionsUpdater(Profile* profile)
+    : profile_(profile) {}
+
+PermissionsUpdater::~PermissionsUpdater() {}
+
+void PermissionsUpdater::AddPermissions(
+    const Extension* extension, const ExtensionPermissionSet* permissions) {
+  scoped_refptr<const ExtensionPermissionSet> existing(
+      extension->GetActivePermissions());
+  scoped_refptr<ExtensionPermissionSet> total(
+      ExtensionPermissionSet::CreateUnion(existing, permissions));
+  scoped_refptr<ExtensionPermissionSet> added(
+      ExtensionPermissionSet::CreateDifference(total.get(), existing));
+
+  UpdateActivePermissions(extension, total.get());
+
+  // Update the granted permissions so we don't auto-disable the extension.
+  GrantActivePermissions(extension);
+
+  NotifyPermissionsUpdated(ADDED, extension, added.get());
+}
+
+void PermissionsUpdater::RemovePermissions(
+    const Extension* extension, const ExtensionPermissionSet* permissions) {
+  scoped_refptr<const ExtensionPermissionSet> existing(
+      extension->GetActivePermissions());
+  scoped_refptr<ExtensionPermissionSet> total(
+      ExtensionPermissionSet::CreateDifference(existing, permissions));
+  scoped_refptr<ExtensionPermissionSet> removed(
+      ExtensionPermissionSet::CreateDifference(existing, total.get()));
+
+  // We update the active permissions, and not the granted permissions, because
+  // the extension, not the user, removed the permissions. This allows the
+  // extension to add them again without prompting the user.
+  UpdateActivePermissions(extension, total.get());
+
+  NotifyPermissionsUpdated(REMOVED, extension, removed.get());
+}
+
+void PermissionsUpdater::GrantActivePermissions(const Extension* extension) {
+  CHECK(extension);
+
+  // We only maintain the granted permissions prefs for extensions that can't
+  // silently increase their permissions.
+  if (extension->CanSilentlyIncreasePermissions())
+    return;
+
+  GetExtensionPrefs()->AddGrantedPermissions(
+      extension->id(), extension->GetActivePermissions());
+}
+
+void PermissionsUpdater::UpdateActivePermissions(
+    const Extension* extension, const ExtensionPermissionSet* permissions) {
+  GetExtensionPrefs()->SetActivePermissions(extension->id(), permissions);
+  extension->SetActivePermissions(permissions);
+}
+
+void PermissionsUpdater::DispatchEvent(
+    const std::string& extension_id,
+    const char* event_name,
+    const ExtensionPermissionSet* changed_permissions) {
+  if (!profile_ || !profile_->GetExtensionEventRouter())
+    return;
+
+  ListValue value;
+  value.Append(PackPermissionsToValue(changed_permissions));
+  std::string json_value;
+  base::JSONWriter::Write(&value, false, &json_value);
+  profile_->GetExtensionEventRouter()->DispatchEventToExtension(
+      extension_id, event_name, json_value, profile_, GURL());
+}
+
+void PermissionsUpdater::NotifyPermissionsUpdated(
+    EventType event_type,
+    const Extension* extension,
+    const ExtensionPermissionSet* changed) {
+  if (!changed || changed->IsEmpty())
+    return;
+
+  UpdatedExtensionPermissionsInfo::Reason reason;
+  const char* event_name = NULL;
+
+  if (event_type == REMOVED) {
+    reason = UpdatedExtensionPermissionsInfo::REMOVED;
+    event_name = kOnRemoved;
+  } else {
+    CHECK_EQ(ADDED, event_type);
+    reason = UpdatedExtensionPermissionsInfo::ADDED;
+    event_name = kOnAdded;
+  }
+
+  // Notify other APIs or interested parties.
+  UpdatedExtensionPermissionsInfo info = UpdatedExtensionPermissionsInfo(
+      extension, changed, reason);
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_EXTENSION_PERMISSIONS_UPDATED,
+      content::Source<Profile>(profile_),
+      content::Details<UpdatedExtensionPermissionsInfo>(&info));
+
+  // Send the new permissions to the renderers.
+  for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
+       !i.IsAtEnd(); i.Advance()) {
+    RenderProcessHost* host = i.GetCurrentValue();
+    Profile* profile = Profile::FromBrowserContext(host->GetBrowserContext());
+    if (profile_->IsSameProfile(profile))
+      host->Send(new ExtensionMsg_UpdatePermissions(
+          static_cast<int>(reason),
+          extension->id(),
+          changed->apis(),
+          changed->explicit_hosts(),
+          changed->scriptable_hosts()));
+  }
+
+  // Trigger the onAdded and onRemoved events in the extension.
+  DispatchEvent(extension->id(), event_name, changed);
+}
+
+ExtensionPrefs* PermissionsUpdater::GetExtensionPrefs() {
+  return profile_->GetExtensionService()->extension_prefs();
+}
+
+}  // namespace extensions