content/renderer/fetchers/manifest_fetcher.h

   1 // Copyright 2014 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 #ifndef CONTENT_RENDERER_FETCHERS_MANIFEST_FETCHER_H_
   6 #define CONTENT_RENDERER_FETCHERS_MANIFEST_FETCHER_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/memory/scoped_ptr.h"
  13 #include "content/common/content_export.h"
  14 #include "third_party/WebKit/public/platform/WebURLResponse.h"
  15
  16 class GURL;
  17
  18 namespace blink {
  19 class WebFrame;
  20 }
  21
  22 namespace content {
  23
  24 class ResourceFetcher;
  25
  26 // Helper class to download a Web Manifest. When an instance is created, the
  27 // caller need to call Start() and wait for the passed callback to be executed.
  28 // If the fetch fails, the callback will be called with two empty objects.
  29 class CONTENT_EXPORT ManifestFetcher {
  30  public:
  31   // This will be called asynchronously after the URL has been fetched,
  32   // successfully or not.  If there is a failure, response and data will both be
  33   // empty.  |response| and |data| are both valid until the URLFetcher instance
  34   // is destroyed.
  35   typedef base::Callback<void(const blink::WebURLResponse& response,
  36                               const std::string& data)> Callback;
  37
  38   explicit ManifestFetcher(const GURL& url);
  39   virtual ~ManifestFetcher();
  40
  41   void Start(blink::WebFrame* frame, const Callback& callback);
  42   void Cancel();
  43
  44  private:
  45   void OnLoadComplete(const blink::WebURLResponse& response,
  46                       const std::string& data);
  47
  48   bool completed_;
  49   Callback callback_;
  50   scoped_ptr<ResourceFetcher> fetcher_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(ManifestFetcher);
  53 };
  54
  55 } // namespace content
  56
  57 #endif  // CONTENT_RENDERER_FETCHERS_MANIFEST_FETCHER_H_