Implementation of URLLoader using PluginResource/ResourceHost.

content/renderer/pepper/pepper_url_loader_host.h

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_RENDERER_PEPPER_PEPPER_URL_LOADER_HOST_H_
+#define CONTENT_RENDERER_PEPPER_PEPPER_URL_LOADER_HOST_H_
+
+#include <vector>
+
+#include "content/common/content_export.h"
+#include "ppapi/host/resource_host.h"
+#include "ppapi/proxy/resource_message_params.h"
+#include "ppapi/shared_impl/url_request_info_data.h"
+#include "ppapi/shared_impl/url_response_info_data.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebURLLoaderClient.h"
+
+namespace WebKit {
+class WebFrame;
+class WebURLLoader;
+}
+
+namespace content {
+
+class RendererPpapiHost;
+
+class PepperURLLoaderHost
+    : public ppapi::host::ResourceHost,
+      public WebKit::WebURLLoaderClient {
+ public:
+  // If main_document_loader is true, PP_Resource must be 0 since it will be
+  // pending until the plugin resource attaches to it.
+  PepperURLLoaderHost(RendererPpapiHost* host,
+                      bool main_document_loader,
+                      PP_Instance instance,
+                      PP_Resource resource);
+  virtual ~PepperURLLoaderHost();
+
+  // ResourceHost implementation.
+  virtual int32_t OnResourceMessageReceived(
+      const IPC::Message& msg,
+      ppapi::host::HostMessageContext* context) OVERRIDE;
+
+  // WebKit::WebURLLoaderClient implementation.
+  virtual void willSendRequest(WebKit::WebURLLoader* loader,
+                               WebKit::WebURLRequest& new_request,
+                               const WebKit::WebURLResponse& redir_response);
+  virtual void didSendData(WebKit::WebURLLoader* loader,
+                           unsigned long long bytes_sent,
+                           unsigned long long total_bytes_to_be_sent);
+  virtual void didReceiveResponse(WebKit::WebURLLoader* loader,
+                                  const WebKit::WebURLResponse& response);
+  virtual void didDownloadData(WebKit::WebURLLoader* loader,
+                               int data_length);
+  virtual void didReceiveData(WebKit::WebURLLoader* loader,
+                               const char* data,
+                               int data_length,
+                               int encoded_data_length);
+  virtual void didFinishLoading(WebKit::WebURLLoader* loader,
+                                double finish_time);
+  virtual void didFail(WebKit::WebURLLoader* loader,
+                       const WebKit::WebURLError& error);
+
+ private:
+  // ResourceHost protected overrides.
+  virtual void DidConnectPendingHostToResource() OVERRIDE;
+
+  // IPC messages
+  int32_t OnHostMsgOpen(ppapi::host::HostMessageContext* context,
+                        const ppapi::URLRequestInfoData& request_data);
+  int32_t InternalOnHostMsgOpen(ppapi::host::HostMessageContext* context,
+                                const ppapi::URLRequestInfoData& request_data);
+  int32_t OnHostMsgSetDeferLoading(ppapi::host::HostMessageContext* context,
+                                   bool defers_loading);
+  int32_t OnHostMsgClose(ppapi::host::HostMessageContext* context);
+  int32_t OnHostMsgGrantUniversalAccess(
+      ppapi::host::HostMessageContext* context);
+
+  // Sends or queues an unsolicited message to the plugin resource. This
+  // handles the case where we have created a pending host resource and the
+  // plugin has not connected to us yet. Such messages will be queued until the
+  // plugin resource connects.
+  //
+  // Takes ownership of the given pointer.
+  void SendUpdateToPlugin(IPC::Message* msg);
+
+  void Close();
+
+  // Returns the frame for the current request.
+  WebKit::WebFrame* GetFrame();
+
+  // Calls SetDefersLoading on the current load. This encapsulates the logic
+  // differences between document loads and regular ones.
+  void SetDefersLoading(bool defers_loading);
+
+  // Converts a WebURLResponse to a URLResponseInfo and saves it.
+  void SaveResponse(const WebKit::WebURLResponse& response);
+
+  // Sends the UpdateProgress message (if necessary) to the plugin.
+  void UpdateProgress();
+
+  // Non-owning pointer.
+  RendererPpapiHost* renderer_ppapi_host_;
+
+  // If true, then the plugin instance is a full-frame plugin and we're just
+  // wrapping the main document's loader (i.e. loader_ is null).
+  bool main_document_loader_;
+
+  // The data that generated the request.
+  ppapi::URLRequestInfoData request_data_;
+
+  // Set to true when this loader can ignore same originl policy.
+  bool has_universal_access_;
+
+  // The loader associated with this request. MAY BE NULL.
+  //
+  // This will be NULL if the load hasn't been opened yet, or if this is a main
+  // document loader (when registered as a mime type). Therefore, you should
+  // always NULL check this value before using it. In the case of a main
+  // document load, you would call the functions on the document to cancel the
+  // load, etc. since there is no loader.
+  scoped_ptr<WebKit::WebURLLoader> loader_;
+
+  int64_t bytes_sent_;
+  int64_t total_bytes_to_be_sent_;
+  int64_t bytes_received_;
+  int64_t total_bytes_to_be_received_;
+
+  // Messages sent while the resource host is pending. These will be forwarded
+  // to the plugin when the plugin side connects. The pointers are owned by
+  // this object and must be deleted.
+  std::vector<IPC::Message*> pending_replies_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperURLLoaderHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_PEPPER_PEPPER_URL_LOADER_HOST_H_