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      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 
     16 namespace {
     17 
     18 const char kAppImagesPath[] = "images/apps/";
     19 const char kAppImagesPath2x[] = "images/2x/apps/";
     20 
     21 const char kReplacement[] = "../../resources/default_100_percent/common/";
     22 const 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.
     30 bool 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 
     44 int 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 
     59 SharedResourcesDataSource::SharedResourcesDataSource() {
     60 }
     61 
     62 SharedResourcesDataSource::~SharedResourcesDataSource() {
     63 }
     64 
     65 std::string SharedResourcesDataSource::GetSource() const {
     66   return content::kChromeUIResourcesHost;
     67 }
     68 
     69 void 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 
     82 std::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