chrome/browser/ui/webui/fallback_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/fallback_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/favicon/fallback_icon_url_parser.h"
  12 #include "chrome/common/url_constants.h"
  13 #include "components/favicon/core/fallback_icon_service.h"
  14 #include "components/keyed_service/core/service_access_type.h"
  15 #include "net/url_request/url_request.h"
  16 #include "ui/gfx/favicon_size.h"
  17 #include "url/gurl.h"
  18
  19 FallbackIconSource::FallbackIconSource(
  20     favicon::FallbackIconService* fallback_icon_service)
  21     : fallback_icon_service_(fallback_icon_service) {
  22 }
  23
  24 FallbackIconSource::~FallbackIconSource() {
  25 }
  26
  27 std::string FallbackIconSource::GetSource() const {
  28   return chrome::kChromeUIFallbackIconHost;
  29 }
  30
  31 void FallbackIconSource::StartDataRequest(
  32     const std::string& path,
  33     int render_process_id,
  34     int render_frame_id,
  35     const content::URLDataSource::GotDataCallback& callback) {
  36   chrome::ParsedFallbackIconPath parsed;
  37   bool success = parsed.Parse(path);
  38   if (!success) {
  39     SendDefaultResponse(callback);
  40     return;
  41   }
  42
  43   GURL url(parsed.url_string());
  44   if (url.is_empty() || !url.is_valid()) {
  45     SendDefaultResponse(callback);
  46     return;
  47   }
  48
  49   SendFallbackIconHelper(
  50       url, parsed.size_in_pixels(), parsed.style(), callback);
  51 }
  52
  53 std::string FallbackIconSource::GetMimeType(const std::string&) const {
  54   // We need to explicitly return a mime type, otherwise if the user tries to
  55   // drag the image they get no extension.
  56   return "image/png";
  57 }
  58
  59 bool FallbackIconSource::ShouldReplaceExistingSource() const {
  60   // Leave the existing DataSource in place, otherwise we'll drop any pending
  61   // requests on the floor.
  62   return false;
  63 }
  64
  65 bool FallbackIconSource::ShouldServiceRequest(
  66     const net::URLRequest* request) const {
  67   if (request->url().SchemeIs(chrome::kChromeSearchScheme))
  68     return InstantIOContext::ShouldServiceRequest(request);
  69   return URLDataSource::ShouldServiceRequest(request);
  70 }
  71
  72 void FallbackIconSource::SendFallbackIconHelper(
  73     const GURL& url,
  74     int size_in_pixels,
  75     const favicon_base::FallbackIconStyle& style,
  76     const content::URLDataSource::GotDataCallback& callback) {
  77   if (!fallback_icon_service_) {  // Can be null for tests.
  78     callback.Run(nullptr);  // Trigger "Not Found" response.
  79     return;
  80   }
  81   std::vector<unsigned char> bitmap_data =
  82       fallback_icon_service_->RenderFallbackIconBitmap(
  83           url, size_in_pixels, style);
  84   callback.Run(base::RefCountedBytes::TakeVector(&bitmap_data));
  85 }
  86
  87 void FallbackIconSource::SendDefaultResponse(
  88     const content::URLDataSource::GotDataCallback& callback) {
  89   favicon_base::FallbackIconStyle default_style;
  90   SendFallbackIconHelper(GURL(), gfx::kFaviconSize, default_style, callback);
  91 }