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   {"../../resources/default_100_percent/common/", "images/apps/"},
  30   {"../../resources/default_200_percent/common/", "images/2x/apps/"},
  31   {"../../../third_party/polymer/components-chromium/", "polymer/"}
  32 };
  33
  34 void AddResource(const std::string& path,
  35                  int resource_id,
  36                  ResourcesMap* resources_map) {
  37   if (!resources_map->insert(std::make_pair(path, resource_id)).second)
  38     NOTREACHED() << "Redefinition of '" << path << "'";
  39 }
  40
  41 const ResourcesMap* CreateResourcesMap() {
  42   ResourcesMap* result = new ResourcesMap();
  43   for (size_t i = 0; i < kWebuiResourcesSize; ++i) {
  44     const std::string resource_name = kWebuiResources[i].name;
  45     const int resource_id = kWebuiResources[i].value;
  46     AddResource(resource_name, resource_id, result);
  47     for (const char* (&alias)[2]: kPathAliases) {
  48       if (StartsWithASCII(resource_name, alias[0], true)) {
  49         AddResource(alias[1] + resource_name.substr(strlen(alias[0])),
  50                     resource_id, result);
  51       }
  52     }
  53   }
  54
  55   return result;
  56 }
  57
  58 const ResourcesMap& GetResourcesMap() {
  59   // This pointer will be intentionally leaked on shutdown.
  60   static const ResourcesMap* resources_map = CreateResourcesMap();
  61   return *resources_map;
  62 }
  63
  64 }  // namespace
  65
  66 SharedResourcesDataSource::SharedResourcesDataSource() {
  67 }
  68
  69 SharedResourcesDataSource::~SharedResourcesDataSource() {
  70 }
  71
  72 std::string SharedResourcesDataSource::GetSource() const {
  73   return kChromeUIResourcesHost;
  74 }
  75
  76 void SharedResourcesDataSource::StartDataRequest(
  77     const std::string& path,
  78     int render_process_id,
  79     int render_frame_id,
  80     const URLDataSource::GotDataCallback& callback) {
  81   const ResourcesMap& resources_map = GetResourcesMap();
  82   auto it = resources_map.find(path);
  83   int idr = (it != resources_map.end()) ? it->second : -1;
  84   DCHECK_NE(-1, idr) << " path: " << path;
  85   scoped_refptr<base::RefCountedMemory> bytes;
  86
  87   if (idr == IDR_WEBUI_CSS_TEXT_DEFAULTS) {
  88     std::vector<std::string> placeholders;
  89     placeholders.push_back(webui::GetTextDirection());  // $1
  90     placeholders.push_back(webui::GetFontFamily());  // $2
  91     placeholders.push_back(webui::GetFontSize());  // $3
  92
  93     ContentClient* content_client = GetContentClient();
  94     const std::string& chrome_shared =
  95         content_client->GetDataResource(idr, ui::SCALE_FACTOR_NONE).as_string();
  96     std::string replaced =
  97         ReplaceStringPlaceholders(chrome_shared, placeholders, nullptr);
  98     bytes = base::RefCountedString::TakeString(&replaced);
  99   } else {
 100     bytes = GetContentClient()->GetDataResourceBytes(idr);
 101   }
 102
 103   callback.Run(bytes.get());
 104 }
 105
 106 std::string SharedResourcesDataSource::GetMimeType(
 107     const std::string& path) const {
 108   // Requests should not block on the disk!  On POSIX this goes to disk.
 109   // http://code.google.com/p/chromium/issues/detail?id=59849
 110
 111   base::ThreadRestrictions::ScopedAllowIO allow_io;
 112   std::string mime_type;
 113   net::GetMimeTypeFromFile(base::FilePath().AppendASCII(path), &mime_type);
 114   return mime_type;
 115 }
 116
 117 std::string
 118 SharedResourcesDataSource::GetAccessControlAllowOriginForOrigin(
 119     const std::string& origin) const {
 120   // For now we give access only for "chrome://*" origins.
 121   // According to CORS spec, Access-Control-Allow-Origin header doesn't support
 122   // wildcards, so we need to set its value explicitly by passing the |origin|
 123   // back.
 124   std::string allowed_origin_prefix = kChromeUIScheme;
 125   allowed_origin_prefix += "://";
 126   if (origin.find(allowed_origin_prefix) != 0)
 127     return "none";
 128   return origin;
 129 }
 130
 131 }  // namespace content