Implement declarativeContent API.

chrome/browser/extensions/api/declarative_content/content_action.cc

+// 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/api/declarative_content/content_action.h"
+
+#include <map>
+
+#include "base/lazy_instance.h"
+#include "base/stringprintf.h"
+#include "base/values.h"
+#include "chrome/browser/extensions/api/declarative_content/content_constants.h"
+#include "chrome/browser/extensions/extension_action.h"
+#include "chrome/browser/extensions/extension_action_manager.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/extensions/extension_tab_util.h"
+#include "chrome/common/extensions/extension.h"
+#include "content/public/browser/invalidate_type.h"
+#include "content/public/browser/web_contents.h"
+
+namespace extensions {
+
+namespace keys = declarative_content_constants;
+
+namespace {
+// Error messages.
+const char kInvalidInstanceTypeError[] =
+    "An action has an invalid instanceType: %s";
+
+#define INPUT_FORMAT_VALIDATE(test) do { \
+    if (!(test)) { \
+      *bad_message = true; \
+      return scoped_ptr<ContentAction>(NULL); \
+    } \
+  } while (0)
+
+//
+// The following are concrete actions.
+//
+
+// Action that instructs to show an extension's page action.
+class ShowPageAction : public ContentAction {
+ public:
+  ShowPageAction() {}
+  virtual ~ShowPageAction() {}
+
+  // Implementation of ContentAction:
+  virtual Type GetType() const OVERRIDE { return ACTION_SHOW_PAGE_ACTION; }
+  virtual void Apply(const std::string& extension_id,
+                     const base::Time& extension_install_time,
+                     ApplyInfo* apply_info) const OVERRIDE {
+    GetPageAction(apply_info->profile, extension_id)->DeclarativeShow(
+        ExtensionTabUtil::GetTabId(apply_info->tab));
+    apply_info->tab->NotifyNavigationStateChanged(
+        content::INVALIDATE_TYPE_PAGE_ACTIONS);
+  }
+  virtual void Revert(const std::string& extension_id,
+                      const base::Time& extension_install_time,
+                      ApplyInfo* apply_info) const OVERRIDE {
+    GetPageAction(apply_info->profile, extension_id)->
+        UndoDeclarativeShow(ExtensionTabUtil::GetTabId(apply_info->tab));
+    apply_info->tab->NotifyNavigationStateChanged(
+        content::INVALIDATE_TYPE_PAGE_ACTIONS);
+  }
+
+ private:
+  static ExtensionAction* GetPageAction(Profile* profile,
+                                        const std::string& extension_id) {
+    ExtensionService* service =
+        ExtensionSystem::Get(profile)->extension_service();
+    const Extension* extension = service->GetInstalledExtension(extension_id);
+    DCHECK(extension);
+    return ExtensionActionManager::Get(profile)->GetPageAction(*extension);
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(ShowPageAction);
+};
+
+// Helper function for ContentActions that can be instantiated by just
+// calling the constructor.
+template <class T>
+scoped_ptr<ContentAction> CallConstructorFactoryMethod(
+    const base::DictionaryValue* dict,
+    std::string* error,
+    bool* bad_message) {
+  return scoped_ptr<ContentAction>(new T);
+}
+
+struct ContentActionFactory {
+  // Factory methods for ContentAction instances. |dict| contains the json
+  // dictionary that describes the action. |error| is used to return error
+  // messages in case the extension passed an action that was syntactically
+  // correct but semantically incorrect. |bad_message| is set to true in case
+  // |dict| does not confirm to the validated JSON specification.
+  typedef scoped_ptr<ContentAction>
+      (* FactoryMethod)(const base::DictionaryValue* /* dict */ ,

[battre, 2013/01/18 10:37:29]

nit: additional space after */

[Jeffrey Yasskin, 2013/01/22 08:01:22]

Done.

+                        std::string* /* error */,
+                        bool* /* bad_message */);
+  std::map<std::string, FactoryMethod> factory_methods;

[battre, 2013/01/18 10:37:29]

comment the std::string in the key represents?

[Jeffrey Yasskin, 2013/01/22 08:01:22]

Done. Remember to do the same in webrequest_action.cc.

[battre, 2013/01/22 12:54:52]

Done.

+
+  ContentActionFactory() {
+    factory_methods[keys::kShowPageAction] =
+        &CallConstructorFactoryMethod<ShowPageAction>;
+  }
+};
+
+base::LazyInstance<ContentActionFactory>::Leaky
+    g_content_action_factory = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+//
+// ContentAction
+//
+
+ContentAction::ContentAction() {}
+
+ContentAction::~ContentAction() {}
+
+// static
+scoped_ptr<ContentAction> ContentAction::Create(
+    const base::Value& json_action,
+    std::string* error,
+    bool* bad_message) {
+  *error = "";
+  *bad_message = false;
+
+  const base::DictionaryValue* action_dict = NULL;
+  INPUT_FORMAT_VALIDATE(json_action.GetAsDictionary(&action_dict));
+
+  std::string instance_type;
+  INPUT_FORMAT_VALIDATE(
+      action_dict->GetString(keys::kInstanceType, &instance_type));
+
+  ContentActionFactory& factory = g_content_action_factory.Get();
+  std::map<std::string, ContentActionFactory::FactoryMethod>::iterator
+      factory_method_iter = factory.factory_methods.find(instance_type);
+  if (factory_method_iter != factory.factory_methods.end())
+    return (*factory_method_iter->second)(action_dict, error, bad_message);
+
+  *error = base::StringPrintf(kInvalidInstanceTypeError, instance_type.c_str());
+  return scoped_ptr<ContentAction>();
+}
+
+}  // namespace extensions