content/browser/webui/shared_resources_data_source.cc

   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/containers/hash_tables.h"
   8 #include "base/logging.h"
   9 #include "base/memory/ref_counted_memory.h"
  10 #include "base/strings/string_piece.h"
  11 #include "base/strings/string_util.h"
  12 #include "base/threading/thread_restrictions.h"
  13 #include "content/public/common/content_client.h"
  14 #include "content/public/common/url_constants.h"
  15 #include "net/base/mime_util.h"
  16 #include "ui/base/layout.h"
  17 #include "ui/base/webui/web_ui_util.h"
  18 #include "ui/resources/grit/webui_resources.h"
  19 #include "ui/resources/grit/webui_resources_map.h"
  20
  21 namespace content {
  22
  23 namespace {
  24
  25 using ResourcesMap = base::hash_map<std::string, int>;
  26
  27 // TODO(rkc): Once we have a separate source for apps, remove '*/apps/' aliases.
  28 const char* kPathAliases[][2] = {
  29     {"../../../third_party/polymer/components-chromium/", "polymer/"},
  30     {"../../../third_party/web-animations-js/sources/",
  31      "polymer/web-animations-js/"},
  32     {"../../resources/default_100_percent/common/", "images/apps/"},
  33     {"../../resources/default_200_percent/common/", "images/2x/apps/"},
  34     {"../../webui/resources/cr_elements/", "cr_elements/"}};
  35
  36 void AddResource(const std::string& path,
  37                  int resource_id,
  38                  ResourcesMap* resources_map) {
  39   if (!resources_map->insert(std::make_pair(path, resource_id)).second)
  40     NOTREACHED() << "Redefinition of '" << path << "'";
  41 }
  42
  43 const ResourcesMap* CreateResourcesMap() {
  44   ResourcesMap* result = new ResourcesMap();
  45   for (size_t i = 0; i < kWebuiResourcesSize; ++i) {
  46     const std::string resource_name = kWebuiResources[i].name;
  47     const int resource_id = kWebuiResources[i].value;
  48     AddResource(resource_name, resource_id, result);
  49     for (const char* (&alias)[2]: kPathAliases) {
  50       if (StartsWithASCII(resource_name, alias[0], true)) {
  51         AddResource(alias[1] + resource_name.substr(strlen(alias[0])),
  52                     resource_id, result);
  53       }
  54     }
  55   }
  56
  57   return result;
  58 }
  59
  60 const ResourcesMap& GetResourcesMap() {
  61   // This pointer will be intentionally leaked on shutdown.
  62   static const ResourcesMap* resources_map = CreateResourcesMap();
  63   return *resources_map;
  64 }
  65
  66 }  // namespace
  67
  68 SharedResourcesDataSource::SharedResourcesDataSource() {
  69 }
  70
  71 SharedResourcesDataSource::~SharedResourcesDataSource() {
  72 }
  73
  74 std::string SharedResourcesDataSource::GetSource() const {
  75   return kChromeUIResourcesHost;
  76 }
  77
  78 void SharedResourcesDataSource::StartDataRequest(
  79     const std::string& path,
  80     int render_process_id,
  81     int render_frame_id,
  82     const URLDataSource::GotDataCallback& callback) {
  83   const ResourcesMap& resources_map = GetResourcesMap();
  84   auto it = resources_map.find(path);
  85   int idr = (it != resources_map.end()) ? it->second : -1;
  86   DCHECK_NE(-1, idr) << " path: " << path;
  87   scoped_refptr<base::RefCountedMemory> bytes;
  88
  89   if (idr == IDR_WEBUI_CSS_TEXT_DEFAULTS) {
  90     std::string css = webui::GetWebUiCssTextDefaults();
  91     bytes = base::RefCountedString::TakeString(&css);
  92   } else {
  93     bytes = GetContentClient()->GetDataResourceBytes(idr);
  94   }
  95
  96   callback.Run(bytes.get());
  97 }
  98
  99 std::string SharedResourcesDataSource::GetMimeType(
 100     const std::string& path) const {
 101   // Requests should not block on the disk!  On POSIX this goes to disk.
 102   // http://code.google.com/p/chromium/issues/detail?id=59849
 103
 104   base::ThreadRestrictions::ScopedAllowIO allow_io;
 105   std::string mime_type;
 106   net::GetMimeTypeFromFile(base::FilePath().AppendASCII(path), &mime_type);
 107   return mime_type;
 108 }
 109
 110 std::string
 111 SharedResourcesDataSource::GetAccessControlAllowOriginForOrigin(
 112     const std::string& origin) const {
 113   // For now we give access only for "chrome://*" origins.
 114   // According to CORS spec, Access-Control-Allow-Origin header doesn't support
 115   // wildcards, so we need to set its value explicitly by passing the |origin|
 116   // back.
 117   std::string allowed_origin_prefix = kChromeUIScheme;
 118   allowed_origin_prefix += "://";
 119   if (origin.find(allowed_origin_prefix) != 0)
 120     return "null";
 121   return origin;
 122 }
 123
 124 }  // namespace content