Implementation of beginning of Declarative Web Request API backend

chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h

Index: chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h
diff --git a/chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h b/chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h
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+// 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_ACTION_H_
+#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_ACTION_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/memory/linked_ptr.h"
+#include "tools/json_schema_compiler/any.h"
+
+namespace base {
+class Value;
+}
+
+namespace extensions {
+namespace declarative_webrequest {
+
+// Base class for all WebRequestActions of the declarative Web Request API.
+class WebRequestAction {
+ public:
+  enum Types {
+    ACTION_CANCEL_REQUEST
+  };
+
+  WebRequestAction();
+  virtual ~WebRequestAction();
+
+  // Returns a bit vector representing extensions::RequestStages. The bit vector
+  // contains a 1 for each request stage during which the condition can be
+  // tested.
+  virtual int GetStages() const = 0;
+
+  virtual Types type() const = 0;
+
+  // TODO(battre): Add method that corresponds to executing the action.
+};
+
+// Immutable container for multiple actions.
+class WebRequestActionCollection {
+ public:
+  // TODO(battre): As WebRequestActionCollection can become the single
+  // owner of all actions, we can optimize here by making some of them
+  // singletons (e.g. Cancel actions).
+  typedef std::vector<linked_ptr<WebRequestAction> > Actions;
+
+  explicit WebRequestActionCollection(const Actions& actions);
+  virtual ~WebRequestActionCollection();
+
+  const Actions& actions() const { return actions_; }
+
+  // TODO(battre): Add method that corresponds to executing the action.
+
+ private:
+  Actions actions_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRequestActionCollection);
+};
+
+// Factory for easy instantiation of various WebRequestAction types.
+class WebRequestActionFactory {
+ public:
+  typedef std::vector<linked_ptr<json_schema_compiler::any::Any> > AnyVector;
+
+  static bool IsHandledByThisFactory(const std::string& action_name);
+
+  static scoped_ptr<WebRequestAction> CreateAction(
+      const base::Value& json_action,
+      std::string* error);
+  static scoped_ptr<WebRequestActionCollection> CreateActionCollection(
+      const AnyVector& actions,
+      std::string* error);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(WebRequestActionFactory);
+};
+
+// Action that instructs to cancel a network request.
+class WebRequestCancelAction : public WebRequestAction {
+ public:
+  WebRequestCancelAction();
+  virtual ~WebRequestCancelAction();
+
+  // Implementation of WebRequestAction:
+  virtual int GetStages() const OVERRIDE;
+  virtual Types type() const OVERRIDE {
+    return WebRequestAction::ACTION_CANCEL_REQUEST;
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WebRequestCancelAction);
+};
+
+// TODO(battre) Implement further actions:
+// Redirect to constant url, Redirect by RegEx, Set header, Remove header, ...
+
+}  // namespace declarative_webrequest
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_ACTION_H_