"Redirecting URLs to Packaged Apps" implementation: revised

apps/url_redirector.h

+// Copyright 2013 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 APPS_URL_REDIRECTOR_H_
+#define APPS_URL_REDIRECTOR_H_
+
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+class ExtensionSet;
+class GURL;
+class Profile;
+
+namespace apps {
+
+// This class observes a WebContent and handles IPCs related to redirecting URLs
+// to apps (in particular related to the 'url_handlers' manifest key), launching
+// a handling app for the requested URL.
+//
+// Also provides a static convenience wrapper to maybe find and launch
+// a handler app for a given URL, if any.
+class UrlRedirector : public content::WebContentsObserver,
+                      public content::WebContentsUserData<UrlRedirector> {
+ public:
+  virtual ~UrlRedirector();
+
+  // Looks for an app that's registered itself for handling a URL pattern
+  // that matches |url|. If found, launches the app by issuing an onLaunched
+  // event with |url| and |referrer_url| available through the launch data,
+  // and returns true. Otherwise, returns false.
+  static bool MaybeLaunchAppWithUrl(Profile* profile,
+                                    const GURL& url,
+                                    const GURL& referrer_url);
+
+ private:
+  explicit UrlRedirector(content::WebContents* web_contents);
+  friend class content::WebContentsUserData<UrlRedirector>;
+
+  // content::WebContentsObserver
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void LaunchAppWithUrl(const GURL& url, const GURL& referrer_url) const;
+
+  // The normal profile associated with this ExtensionService.
+  Profile* profile_;
+};
+
+}  // namespace apps
+
+#endif  // APPS_URL_REDIRECTOR_H_