Allow platform apps to respond to Web Intents

chrome/browser/extensions/web_intent_callbacks.h

+// 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_WEB_INTENT_CALLBACKS_H_
+#define CHROME_BROWSER_EXTENSIONS_WEB_INTENT_CALLBACKS_H_
+
+#include <set>
+
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "base/observer_list.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+#include "ui/gfx/native_widget_types.h"
+
+class Profile;
+
+namespace content {
+class WebIntentsDispatcher;
+}
+
+// The WebIntentCallbacks class tracks the pending callbacks for web intents
+// that have been delivered to platform apps, for a particular profile.
+class WebIntentCallbacks : public ProfileKeyedService {

[Mihai Parparita -not on Chrome, 2012/08/09 04:38:33]

This should either be in the extensions namespace (preferable), or have
"Extension" somewhere in the class name, since otherwise it sounds very generic,
even though the use is extensions/apps-specific.

[thorogood, 2012/08/09 09:56:51]

I mostly inspired this class from ShellWindowRegistry (in the same folder as
this), which has no namespace. I can add the extension namespace though -- done.

+ public:
+  typedef std::map<std::string, content::WebIntentsDispatcher*> CallbackMap;

[Mihai Parparita -not on Chrome, 2012/08/09 04:38:33]

This doesn't seem to need to be public.

[thorogood, 2012/08/09 09:56:51]

I mostly inspired this class from ShellWindowRegistry (in the same folder as
this), which has no namespace. I can add the extension namespace though, done.

+
+  WebIntentCallbacks();
+  virtual ~WebIntentCallbacks();
+
+  // Returns the instance for the given profile. This is a convenience wrapper
+  // around WebIntentCallbacks::Factory::GetForProfile.
+  static WebIntentCallbacks* Get(Profile* profile);
+
+  // Registers the callback for the Web Intent we're about to dispatch to a
+  // platform app. Returns an opaque string identifier that should later be
+  // dispatched to RetrieveCallback in order to invoke the callback registered
+  // here.
+  std::string RegisterCallback(content::WebIntentsDispatcher* dispatcher);
+
+  // Retrieves the callback for the given opaque string identifier. This will
+  // clear the callback. If there is no callback registered under this
+  // identifier, then this will return NULL.
+  content::WebIntentsDispatcher* RetrieveCallback(std::string key);
+
+ private:
+  class Factory : public ProfileKeyedServiceFactory {
+   public:
+    static WebIntentCallbacks* GetForProfile(Profile* profile);
+
+    static Factory* GetInstance();
+   private:
+    friend struct DefaultSingletonTraits<Factory>;
+
+    Factory();
+    virtual ~Factory();
+
+    // ProfileKeyedServiceFactory
+    virtual ProfileKeyedService* BuildServiceInstanceFor(
+        Profile* profile) const OVERRIDE;
+  };
+
+  int last_id_;
+
+  CallbackMap pending_;
+};
+
+#endif  // CHROME_BROWSER_EXTENSIONS_WEB_INTENT_CALLBACKS_H_