content/renderer/fetchers/multi_resolution_image_resource_fetcher.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/renderer/fetchers/multi_resolution_image_resource_fetcher.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "content/child/image_decoder.h"
  10 #include "content/public/renderer/resource_fetcher.h"
  11 #include "third_party/WebKit/public/platform/WebURLResponse.h"
  12 #include "third_party/WebKit/public/web/WebFrame.h"
  13 #include "third_party/WebKit/public/web/WebURLLoaderOptions.h"
  14 #include "third_party/skia/include/core/SkBitmap.h"
  15 #include "ui/gfx/geometry/size.h"
  16
  17 using blink::WebFrame;
  18 using blink::WebURLLoaderOptions;
  19 using blink::WebURLRequest;
  20 using blink::WebURLResponse;
  21
  22 namespace content {
  23
  24 MultiResolutionImageResourceFetcher::MultiResolutionImageResourceFetcher(
  25     const GURL& image_url,
  26     WebFrame* frame,
  27     int id,
  28     WebURLRequest::RequestContext request_context,
  29     blink::WebURLRequest::CachePolicy cache_policy,
  30     const Callback& callback)
  31     : callback_(callback),
  32       id_(id),
  33       http_status_code_(0),
  34       image_url_(image_url) {
  35   fetcher_.reset(ResourceFetcher::Create(image_url));
  36
  37   WebURLLoaderOptions options;
  38   options.allowCredentials = true;
  39   options.crossOriginRequestPolicy =
  40       WebURLLoaderOptions::CrossOriginRequestPolicyAllow;
  41   fetcher_->SetLoaderOptions(options);
  42
  43   // To prevent cache tainting, the favicon requests have to by-pass the service
  44   // workers. This should ideally not happen or at least not all the time.
  45   // See https://crbug.com/448427
  46   if (request_context == WebURLRequest::RequestContextFavicon)
  47     fetcher_->SetSkipServiceWorker(true);
  48
  49   fetcher_->SetCachePolicy(cache_policy);
  50
  51   fetcher_->Start(
  52       frame,
  53       request_context,
  54       WebURLRequest::FrameTypeNone,
  55       ResourceFetcher::FRAME_ASSOCIATED_LOADER,
  56       base::Bind(&MultiResolutionImageResourceFetcher::OnURLFetchComplete,
  57                  base::Unretained(this)));
  58 }
  59
  60 MultiResolutionImageResourceFetcher::~MultiResolutionImageResourceFetcher() {
  61 }
  62
  63 void MultiResolutionImageResourceFetcher::OnURLFetchComplete(
  64     const WebURLResponse& response,
  65     const std::string& data) {
  66   std::vector<SkBitmap> bitmaps;
  67   if (!response.isNull()) {
  68     http_status_code_ = response.httpStatusCode();
  69     GURL url(response.url());
  70     if (http_status_code_ == 200 || url.SchemeIsFile()) {
  71       // Request succeeded, try to convert it to an image.
  72       bitmaps = ImageDecoder::DecodeAll(
  73           reinterpret_cast<const unsigned char*>(data.data()), data.size());
  74     }
  75   } // else case:
  76     // If we get here, it means no image from server or couldn't decode the
  77     // response as an image. The delegate will see an empty vector.
  78
  79   // Take a reference to the callback as running the callback may lead to our
  80   // destruction.
  81   Callback callback = callback_;
  82   callback.Run(this, bitmaps);
  83 }
  84
  85 }  // namespace content