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 "content/browser/webui/shared_resources_data_source.h"
6
7#include "base/logging.h"
8#include "base/memory/ref_counted_memory.h"
9#include "base/strings/string_util.h"
10#include "base/threading/thread_restrictions.h"
11#include "content/public/common/content_client.h"
12#include "content/public/common/url_constants.h"
13#include "net/base/mime_util.h"
14#include "ui/resources/grit/webui_resources_map.h"
15
16namespace {
17
18const char kAppImagesPath[] = "images/apps/";
19const char kAppImagesPath2x[] = "images/2x/apps/";
20
21const char kReplacement[] = "../../resources/default_100_percent/common/";
22const char kReplacement2x[] = "../../resources/default_200_percent/common/";
23
24// This entire method is a hack introduced to be able to handle apps images
25// that exist in the ui/resources directory. From JS/CSS, we still load the
26// image as if it were chrome://resources/images/apps/myappimage.png, if that
27// path doesn't exist, we check to see if it that image exists in the relative
28// path to ui/resources instead.
29// TODO(rkc): Once we have a separate source for apps, remove this code.
30bool AppsRelativePathMatch(const std::string& path,
31                           const std::string& compareto) {
32  if (StartsWithASCII(path, kAppImagesPath, false)) {
33    if (compareto ==
34        (kReplacement + path.substr(arraysize(kAppImagesPath) - 1)))
35      return true;
36  } else if (StartsWithASCII(path, kAppImagesPath2x, false)) {
37    if (compareto ==
38        (kReplacement2x + path.substr(arraysize(kAppImagesPath2x) - 1)))
39      return true;
40  }
41  return false;
42}
43
44int PathToIDR(const std::string& path) {
45  int idr = -1;
46  for (size_t i = 0; i < kWebuiResourcesSize; ++i) {
47    if ((path == kWebuiResources[i].name) ||
48        AppsRelativePathMatch(path, kWebuiResources[i].name)) {
49      idr = kWebuiResources[i].value;
50      break;
51    }
52  }
53
54  return idr;
55}
56
57}  // namespace
58
59SharedResourcesDataSource::SharedResourcesDataSource() {
60}
61
62SharedResourcesDataSource::~SharedResourcesDataSource() {
63}
64
65std::string SharedResourcesDataSource::GetSource() const {
66  return content::kChromeUIResourcesHost;
67}
68
69void SharedResourcesDataSource::StartDataRequest(
70    const std::string& path,
71    int render_process_id,
72    int render_frame_id,
73    const content::URLDataSource::GotDataCallback& callback) {
74  int idr = PathToIDR(path);
75  DCHECK_NE(-1, idr) << " path: " << path;
76  scoped_refptr<base::RefCountedStaticMemory> bytes(
77      content::GetContentClient()->GetDataResourceBytes(idr));
78
79  callback.Run(bytes.get());
80}
81
82std::string SharedResourcesDataSource::GetMimeType(
83    const std::string& path) const {
84  // Requests should not block on the disk!  On POSIX this goes to disk.
85  // http://code.google.com/p/chromium/issues/detail?id=59849
86
87  base::ThreadRestrictions::ScopedAllowIO allow_io;
88  std::string mime_type;
89  net::GetMimeTypeFromFile(base::FilePath().AppendASCII(path), &mime_type);
90  return mime_type;
91}
92