extension_resource_protocols.cc revision 7d4cd473f85ac64c3747c96c277f9e506a0d2246 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/extensions/extension_resource_protocols.h"
6
7#include "base/files/file_path.h"
8#include "base/memory/weak_ptr.h"
9#include "base/path_service.h"
10#include "base/threading/thread_checker.h"
11#include "chrome/common/chrome_paths.h"
12#include "chrome/common/extensions/extension_file_util.h"
13#include "content/public/browser/browser_thread.h"
14#include "net/url_request/url_request_file_job.h"
15
16namespace {
17
18base::FilePath ResolvePath(const GURL& url) {
19  base::FilePath root_path;
20  PathService::Get(chrome::DIR_RESOURCES_EXTENSION, &root_path);
21  return extension_file_util::ExtensionResourceURLToFilePath(url, root_path);
22}
23
24class ExtensionResourcesJob : public net::URLRequestFileJob {
25 public:
26  ExtensionResourcesJob(net::URLRequest* request,
27                        net::NetworkDelegate* network_delegate)
28    : net::URLRequestFileJob(request, network_delegate, base::FilePath()),
29      weak_ptr_factory_(this) {
30  }
31
32  virtual void Start() OVERRIDE;
33
34 protected:
35  virtual ~ExtensionResourcesJob() {}
36
37  void ResolvePathDone(const base::FilePath& resolved_path);
38
39 private:
40  base::WeakPtrFactory<ExtensionResourcesJob> weak_ptr_factory_;
41
42  base::ThreadChecker thread_checker_;
43
44  DISALLOW_COPY_AND_ASSIGN(ExtensionResourcesJob);
45};
46
47void ExtensionResourcesJob::Start() {
48  DCHECK(thread_checker_.CalledOnValidThread());
49  content::BrowserThread::PostTaskAndReplyWithResult(
50      content::BrowserThread::FILE, FROM_HERE,
51      base::Bind(&ResolvePath, request()->url()),
52      base::Bind(&ExtensionResourcesJob::ResolvePathDone,
53          weak_ptr_factory_.GetWeakPtr()));
54}
55
56void ExtensionResourcesJob::ResolvePathDone(
57    const base::FilePath& resolved_path) {
58  DCHECK(thread_checker_.CalledOnValidThread());
59  file_path_ = resolved_path;
60  net::URLRequestFileJob::Start();
61}
62
63class ExtensionResourceProtocolHandler
64    : public net::URLRequestJobFactory::ProtocolHandler {
65 public:
66  ExtensionResourceProtocolHandler() {}
67  virtual ~ExtensionResourceProtocolHandler() {}
68
69  virtual net::URLRequestJob* MaybeCreateJob(
70      net::URLRequest* request,
71      net::NetworkDelegate* network_delegate) const OVERRIDE;
72
73 private:
74  DISALLOW_COPY_AND_ASSIGN(ExtensionResourceProtocolHandler);
75};
76
77// Creates URLRequestJobs for chrome-extension-resource:// URLs.
78net::URLRequestJob*
79ExtensionResourceProtocolHandler::MaybeCreateJob(
80    net::URLRequest* request, net::NetworkDelegate* network_delegate) const {
81  return new ExtensionResourcesJob(request, network_delegate);
82}
83
84}  // namespace
85
86net::URLRequestJobFactory::ProtocolHandler*
87CreateExtensionResourceProtocolHandler() {
88  return new ExtensionResourceProtocolHandler();
89}
90