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Side by Side Diff: content/renderer/fetchers/manifest_fetcher.h

Issue 532773002: Implement ManifestFetcher, helper to fetch Web Manifests. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: typo Created 6 years, 3 months ago
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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 "third_party/WebKit/public/platform/WebURLLoaderClient.h"
14 #include "third_party/WebKit/public/platform/WebURLRequest.h"
15 #include "third_party/WebKit/public/platform/WebURLResponse.h"
16
17 class GURL;
18
19 namespace blink {
20 class WebFrame;
21 class WebURLLoader;
22 struct WebURLError;
23 }
24
25 namespace content {
26
27 // Helper class to download a Web Manifest. When an instance is created, the
28 // caller need to call Start() and wait for the passed callback to be executed.
29 // If the fetch fails, the callback will be called with two empty objects.
30 //
31 // This class is not using ResourceFetcher because ResourceFetcherImpl is using
32 // Platform::createURLLoader() instead of createAssociatedURLLoader(). The
33 // former is too permissive with regards to CORS and mixed content.
34 class ManifestFetcher : public blink::WebURLLoaderClient {
35 public:
36 // This will be called asynchronously after the URL has been fetched,
37 // successfully or not. If there is a failure, response and data will both be
38 // empty. |response| and |data| are both valid until the URLFetcher instance
39 // is destroyed.
40 typedef base::Callback<void(const blink::WebURLResponse& response,
41 const std::string& data)> Callback;
42
43 explicit ManifestFetcher(const GURL& url);
44 virtual ~ManifestFetcher();
45
46 void Start(blink::WebFrame* frame, const Callback& callback);
47 void Cancel();
48
49 private:
50 void RunCallback(const blink::WebURLResponse& response,
51 const std::string& data);
52
53 // WebURLLoaderClient implementation.
54 virtual void didReceiveResponse(
55 blink::WebURLLoader* loader, const blink::WebURLResponse& response);
56 virtual void didReceiveData(
57 blink::WebURLLoader* loader, const char* data, int data_length,
58 int encoded_data_length);
59 virtual void didFinishLoading(
60 blink::WebURLLoader* loader, double finishTime,
61 int64_t total_encoded_data_length);
62 virtual void didFail(
63 blink::WebURLLoader* loader, const blink::WebURLError& error);
64
65 scoped_ptr<blink::WebURLLoader> loader_;
66
67 // Request to send. Released once Start() is called.
68 blink::WebURLRequest request_;
69
70 // Set to true once the request is complete.
71 bool completed_;
72
73 // Buffer to hold the content from the server.
74 std::string data_;
75
76 // A copy of the original resource response.
77 blink::WebURLResponse response_;
78
79 // Callback when we're done.
80 Callback callback_;
81
82 DISALLOW_COPY_AND_ASSIGN(ManifestFetcher);
83 };
84
85 } // namespace content
86
87 #endif // CONTENT_RENDERER_FETCHERS_MANIFEST_FETCHER_H_
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