Add schema chrome-extension-resource:// for extension resources

chrome/browser/extensions/extension_resource_protocols.cc

+// 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.
+
+#include "chrome/browser/extensions/extension_resource_protocols.h"
+
+#include "base/file_path.h"
+#include "base/path_service.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/extensions/extension_file_util.h"
+#include "content/public/browser/browser_thread.h"
+#include "net/url_request/url_request_file_job.h"
+
+namespace {
+
+class ExtensionResourcesJob : public net::URLRequestFileJob {
+ public:
+  explicit ExtensionResourcesJob(net::URLRequest* request)
+    : net::URLRequestFileJob(request, FilePath()) { }
+
+  virtual void Start() OVERRIDE;
+
+ protected:
+  ~ExtensionResourcesJob() { }
+
+  void ResolvePath();
+  void ResolvePathDone();
+
+ private:
+  content::BrowserThread::ID thread_id_;
+};
+
+void ExtensionResourcesJob::Start() {
+  bool result =
+      content::BrowserThread::GetCurrentThreadIdentifier(&thread_id_);
+  CHECK(result) << "Can not get thread id.";
+  content::BrowserThread::PostTask(
+      content::BrowserThread::FILE, FROM_HERE,
+      base::Bind(&ExtensionResourcesJob::ResolvePath, this));
+}
+
+void ExtensionResourcesJob::ResolvePath() {
+  FilePath root_path;
+  PathService::Get(chrome::DIR_RESOURCES_EXTENSION, &root_path);
+  file_path_ = extension_file_util::ExtensionResourceURLToFilePath(
+      request()->url(), root_path);
+  content::BrowserThread::PostTask(
+      thread_id_, FROM_HERE,
+      base::Bind(&ExtensionResourcesJob::ResolvePathDone, this));
+}
+
+void ExtensionResourcesJob::ResolvePathDone() {
+  net::URLRequestFileJob::Start();
+}
+
+class ExtensionResourceProtocolHandler
+    : public net::URLRequestJobFactory::ProtocolHandler {
+ public:
+  ExtensionResourceProtocolHandler() {}
+  virtual ~ExtensionResourceProtocolHandler() {}
+
+  virtual net::URLRequestJob* MaybeCreateJob(
+      net::URLRequest* request) const OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ExtensionResourceProtocolHandler);
+};
+
+// Creates URLRequestJobs for chrome-extension-resource:// URLs.
+net::URLRequestJob*
+ExtensionResourceProtocolHandler::MaybeCreateJob(
+    net::URLRequest* request) const {
+  return new ExtensionResourcesJob(request);
+}
+
+}  // namespace
+
+net::URLRequestJobFactory::ProtocolHandler*
+CreateExtensionResourceProtocolHandler() {
+  return new ExtensionResourceProtocolHandler();
+}