content/public/renderer/resource_fetcher.h

   1 // Copyright 2013 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_PUBLIC_RENDERER_RESOURCE_FETCHER_H_
   6 #define CONTENT_PUBLIC_RENDERER_RESOURCE_FETCHER_H_
   7
   8 #include <string>
   9
  10 #include "base/callback.h"
  11 #include "content/common/content_export.h"
  12 #include "third_party/WebKit/public/platform/WebURLRequest.h"
  13
  14 class GURL;
  15
  16 namespace base {
  17 class TimeDelta;
  18 }
  19
  20 namespace blink {
  21 class WebFrame;
  22 class WebURLResponse;
  23 }
  24
  25 namespace content {
  26
  27 // Interface to download resources asynchronously.
  28 class CONTENT_EXPORT ResourceFetcher {
  29  public:
  30   enum LoaderType {
  31     PLATFORM_LOADER,         // uses Platform::createURLLoader
  32     FRAME_ASSOCIATED_LOADER, // uses WebFrame::createAssociatedURLLoader
  33   };
  34
  35   virtual ~ResourceFetcher() {}
  36
  37   // This will be called asynchronously after the URL has been fetched,
  38   // successfully or not.  If there is a failure, response and data will both be
  39   // empty.  |response| and |data| are both valid until the URLFetcher instance
  40   // is destroyed.
  41   typedef base::Callback<void(const blink::WebURLResponse& response,
  42                               const std::string& data)> Callback;
  43
  44   // Creates a ResourceFetcher for the specified resource.  Caller takes
  45   // ownership of the returned object.  Deleting the ResourceFetcher will cancel
  46   // the request, and the callback will never be run.
  47   static ResourceFetcher* Create(const GURL& url);
  48
  49   // Set the corresponding parameters of the request.  Must be called before
  50   // Start.  By default, requests are GETs with no body.
  51   virtual void SetMethod(const std::string& method) = 0;
  52   virtual void SetBody(const std::string& body) = 0;
  53   virtual void SetHeader(const std::string& header,
  54                          const std::string& value) = 0;
  55
  56   // Starts the request using the specified frame.  Calls |callback| when
  57   // done.
  58   virtual void Start(blink::WebFrame* frame,
  59                      blink::WebURLRequest::RequestContext request_context,
  60                      blink::WebURLRequest::FrameType frame_type,
  61                      LoaderType loader_type,
  62                      const Callback& callback) = 0;
  63
  64   // Sets how long to wait for the server to reply.  By default, there is no
  65   // timeout.  Must be called after a request is started.
  66   virtual void SetTimeout(const base::TimeDelta& timeout) = 0;
  67
  68   // Manually cancel the request.
  69   virtual void Cancel() = 0;
  70 };
  71
  72 }  // namespace content
  73
  74 #endif  // CONTENT_PUBLIC_RENDERER_RESOURCE_FETCHER_H_