chrome/browser/ui/webui/large_icon_source.cc

   1 // Copyright 2015 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/ui/webui/large_icon_source.h"
   6
   7 #include <vector>
   8
   9 #include "base/memory/ref_counted_memory.h"
  10 #include "chrome/browser/search/instant_io_context.h"
  11 #include "chrome/common/url_constants.h"
  12 #include "components/favicon/core/fallback_icon_service.h"
  13 #include "components/favicon/core/large_icon_service.h"
  14 #include "components/favicon_base/fallback_icon_style.h"
  15 #include "components/favicon_base/favicon_types.h"
  16 #include "components/favicon_base/large_icon_url_parser.h"
  17 #include "net/url_request/url_request.h"
  18
  19 namespace {
  20
  21 const int kMaxLargeIconSize = 192;  // Arbitrary bound to safeguard endpoint.
  22
  23 }  // namespace
  24
  25 LargeIconSource::LargeIconSource(
  26     favicon::FallbackIconService* fallback_icon_service,
  27     favicon::LargeIconService* large_icon_service)
  28     : fallback_icon_service_(fallback_icon_service),
  29       large_icon_service_(large_icon_service) {
  30 }
  31
  32 LargeIconSource::~LargeIconSource() {
  33 }
  34
  35 std::string LargeIconSource::GetSource() const {
  36   return chrome::kChromeUILargeIconHost;
  37 }
  38
  39 void LargeIconSource::StartDataRequest(
  40     const std::string& path,
  41     int render_process_id,
  42     int render_frame_id,
  43     const content::URLDataSource::GotDataCallback& callback) {
  44   if (!large_icon_service_) {
  45     SendNotFoundResponse(callback);
  46     return;
  47   }
  48
  49   LargeIconUrlParser parser;
  50   bool success = parser.Parse(path);
  51   if (!success ||
  52       parser.size_in_pixels() <= 0 ||
  53       parser.size_in_pixels() > kMaxLargeIconSize) {
  54     SendNotFoundResponse(callback);
  55     return;
  56   }
  57
  58   GURL url(parser.url_string());
  59   if (!url.is_valid()) {
  60     SendNotFoundResponse(callback);
  61     return;
  62   }
  63
  64   // TODO(beaudoin): Potentially allow icon to be scaled up.
  65   large_icon_service_->GetLargeIconOrFallbackStyle(
  66       url,
  67       parser.size_in_pixels(),  // Reducing this will enable scale up.
  68       parser.size_in_pixels(),
  69       base::Bind(&LargeIconSource::OnLargeIconDataAvailable,
  70                  base::Unretained(this), callback, url,
  71                  parser.size_in_pixels()),
  72       &cancelable_task_tracker_);
  73 }
  74
  75 std::string LargeIconSource::GetMimeType(const std::string&) const {
  76   // We need to explicitly return a mime type, otherwise if the user tries to
  77   // drag the image they get no extension.
  78   return "image/png";
  79 }
  80
  81 bool LargeIconSource::ShouldReplaceExistingSource() const {
  82   // Leave the existing DataSource in place, otherwise we'll drop any pending
  83   // requests on the floor.
  84   return false;
  85 }
  86
  87 bool LargeIconSource::ShouldServiceRequest(
  88     const net::URLRequest* request) const {
  89   if (request->url().SchemeIs(chrome::kChromeSearchScheme))
  90     return InstantIOContext::ShouldServiceRequest(request);
  91   return URLDataSource::ShouldServiceRequest(request);
  92 }
  93
  94 void LargeIconSource::OnLargeIconDataAvailable(
  95     const content::URLDataSource::GotDataCallback& callback,
  96     const GURL& url,
  97     int size,
  98     const favicon_base::LargeIconResult& result) {
  99   if (result.bitmap.is_valid()) {
 100     callback.Run(result.bitmap.bitmap_data.get());
 101     return;
 102   }
 103
 104   // Bitmap is invalid, use the fallback if service is available.
 105   if (!fallback_icon_service_ || !result.fallback_icon_style) {
 106     SendNotFoundResponse(callback);
 107     return;
 108   }
 109   std::vector<unsigned char> bitmap_data =
 110       fallback_icon_service_->RenderFallbackIconBitmap(
 111           url, size, *result.fallback_icon_style);
 112   callback.Run(base::RefCountedBytes::TakeVector(&bitmap_data));
 113 }
 114
 115 void LargeIconSource::SendNotFoundResponse(
 116     const content::URLDataSource::GotDataCallback& callback) {
 117   callback.Run(nullptr);
 118 }