ServiceWorker: Support longest-prefix-match for registration scope

content/browser/service_worker/service_worker_utils.h

 // Copyright 2014 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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_UTILS_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_UTILS_H_
 
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "webkit/common/resource_type.h"
 
+class GURL;
+
 namespace content {
 
 class ServiceWorkerUtils {
  public:
   static bool IsMainResourceType(ResourceType::Type type) {
     return ResourceType::IsFrame(type) ||
            ResourceType::IsSharedWorker(type);
   }
 
   static bool IsServiceWorkerResourceType(ResourceType::Type type) {
     return ResourceType::IsServiceWorker(type);
   }
 
   // Returns true if the feature is enabled (or not disabled) by command-line
   // flag.
   static bool IsFeatureEnabled();
 
   // A helper for creating a do-nothing status callback.
   static void NoOpStatusCallback(ServiceWorkerStatusCode status) {}
 
   // Returns true if |scope| matches |url|.
   CONTENT_EXPORT static bool ScopeMatches(const GURL& scope, const GURL& url);
 };
 
+class CONTENT_EXPORT LongestScopeMatcher {
+ public:
+  explicit LongestScopeMatcher(const GURL& url) : url_(url) {}
+  virtual ~LongestScopeMatcher() {}
+
+  // Returns true if |scope| matches |url_| longer than |match_|.
+  bool MatchLongest(const GURL& scope);
+
+ private:
+  const GURL url_;
+  GURL match_;
+
+  DISALLOW_COPY_AND_ASSIGN(LongestScopeMatcher);
+};
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_UTILS_H_