ServiceWorker: Support longest-prefix-match for registration scope

content/browser/service_worker/service_worker_utils.cc

 // 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.
 
 #include "content/browser/service_worker/service_worker_utils.h"
 
+#include <string>
+
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/public/common/content_switches.h"
+#include "url/gurl.h"
 
 namespace content {
 
 // static
 bool ServiceWorkerUtils::IsFeatureEnabled() {
   static bool enabled = CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableServiceWorker);
   return enabled;
 }
 
 // static
 bool ServiceWorkerUtils::ScopeMatches(const GURL& scope, const GURL& url) {
   DCHECK(!scope.has_ref());
   DCHECK(!url.has_ref());
   const std::string& scope_spec = scope.spec();
   const std::string& url_spec = url.spec();
 
   size_t len = scope_spec.size();
   if (len > 0 && scope_spec[len - 1] == '*')
     return scope_spec.compare(0, len - 1, url_spec, 0, len - 1) == 0;
   return scope_spec == url_spec;
 }
 
+bool LongestScopeMatcher::MatchLongest(const GURL& scope) {
+  if (!ServiceWorkerUtils::ScopeMatches(scope, url_))
+    return false;
+  // TODO(nhiroki): How should we prioritize scopes "/fo*" and "/foo"
+  // for a document "/foo"?

[jsbell, 2014/06/03 18:48:30]

Add link to github spec issue?

[nhiroki, 2014/06/05 11:00:35]

Done.

+  if (match_.is_empty() ||
+      match_.spec().size() < scope.spec().size()) {
+    match_ = scope;
+    return true;
+  }
+  return false;
+}
+
 }  // namespace content