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
16class GURL;
17
18namespace blink {
19class WebFrame;
20}
21
22namespace content {
23
24class 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.
29class 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_
58