Pepper WebSocket API: Implement new design Chrome IPC

ppapi/proxy/websocket_resource.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 PPAPI_PROXY_WEBSOCKET_RESOURCE_H_
+#define PPAPI_PROXY_WEBSOCKET_RESOURCE_H_
+
+#include <queue>
+
+#include "ppapi/c/ppb_websocket.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/shared_impl/tracked_callback.h"
+#include "ppapi/thunk/ppb_websocket_api.h"
+
+namespace ppapi {
+
+class StringVar;
+class Var;
+
+namespace proxy {
+
+// This class contains protocol checks which doesn't affect security when it
+// run with untrusted code.
+class PPAPI_PROXY_EXPORT WebSocketResource
+    : public PluginResource,
+      public NON_EXPORTED_BASE(thunk::PPB_WebSocket_API) {
+ public:
+  WebSocketResource(Connection connection, PP_Instance instance);
+  virtual ~WebSocketResource();
+
+  // PluginResource implementation.
+  virtual thunk::PPB_WebSocket_API* AsPPB_WebSocket_API() OVERRIDE;
+
+  // PPB_WebSocket_API implementation.
+  virtual int32_t Connect(const PP_Var& url,
+                          const PP_Var protocols[],
+                          uint32_t protocol_count,
+                          scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t Close(uint16_t code,
+                        const PP_Var& reason,
+                        scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t ReceiveMessage(
+      PP_Var* message,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t SendMessage(const PP_Var& message) OVERRIDE;
+  virtual uint64_t GetBufferedAmount() OVERRIDE;
+  virtual uint16_t GetCloseCode() OVERRIDE;
+  virtual PP_Var GetCloseReason() OVERRIDE;
+  virtual PP_Bool GetCloseWasClean() OVERRIDE;
+  virtual PP_Var GetExtensions() OVERRIDE;
+  virtual PP_Var GetProtocol() OVERRIDE;
+  virtual PP_WebSocketReadyState GetReadyState() OVERRIDE;
+  virtual PP_Var GetURL() OVERRIDE;
+
+ private:
+  // PluginResource override.
+  virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
+                               const IPC::Message& msg) OVERRIDE;
+
+  // IPC message handlers.
+  void OnPluginMsgConnectReply(const ResourceMessageReplyParams& params,
+                               const std::string& url,
+                               const std::string& protocol);
+  void OnPluginMsgCloseReply(const ResourceMessageReplyParams& params,
+                             unsigned long buffered_amount,
+                             bool was_clean,
+                             unsigned short code,
+                             const std::string& reason);
+  void OnPluginMsgReceiveTextReply(const ResourceMessageReplyParams& params,
+                                   const std::string& message);
+  void OnPluginMsgReceiveBinaryReply(const ResourceMessageReplyParams& params,
+                                     const std::vector<uint8_t>& message);
+  void OnPluginMsgErrorReply(const ResourceMessageReplyParams& params);
+  void OnPluginMsgBufferedAmountReply(const ResourceMessageReplyParams& params,
+                                      unsigned long buffered_amount);
+  void OnPluginMsgStateReply(const ResourceMessageReplyParams& params,
+                             int32_t state);
+  void OnPluginMsgClosedReply(const ResourceMessageReplyParams& params,
+                              unsigned long buffered_amount,
+                              bool was_clean,
+                              unsigned short code,
+                              const std::string& reason);
+
+  // Picks up a received message and moves it to user receiving buffer. This
+  // function is used in both ReceiveMessage for fast returning path, and
+  // OnPluginMsgReceiveTextReply and OnPluginMsgReceiveBinaryReply for delayed
+  // callback invocations.
+  int32_t DoReceive();
+
+  // Holds user callbacks to invoke later.
+  scoped_refptr<TrackedCallback> connect_callback_;
+  scoped_refptr<TrackedCallback> close_callback_;
+  scoped_refptr<TrackedCallback> receive_callback_;
+
+  // Represents readyState described in the WebSocket API specification. It can
+  // be read via GetReadyState().
+  PP_WebSocketReadyState state_;
+
+  // Becomes true if any error is detected. Incoming data will be disposed
+  // if this variable is true, then ReceiveMessage() returns PP_ERROR_FAILED
+  // after returning all received data.
+  bool error_was_received_;
+
+  // Keeps a pointer to PP_Var which is provided via ReceiveMessage().
+  // Received data will be copied to this PP_Var on ready.
+  PP_Var* receive_callback_var_;
+
+  // Keeps received data until ReceiveMessage() requests.
+  std::queue<scoped_refptr<Var> > received_messages_;
+
+  // Keeps empty string for functions to return empty string.
+  scoped_refptr<StringVar> empty_string_;
+
+  // Keeps the status code field of closing handshake. It can be read via
+  // GetCloseCode().
+  uint16_t close_code_;
+
+  // Keeps the reason field of closing handshake. It can be read via
+  // GetCloseReason().
+  scoped_refptr<StringVar> close_reason_;
+
+  // Becomes true when closing handshake is performed successfully. It can be
+  // read via GetCloseWasClean().
+  PP_Bool close_was_clean_;
+
+  // Represents extensions described in the WebSocket API specification. It can
+  // be read via GetExtensions().
+  scoped_refptr<StringVar> extensions_;
+
+  // Represents protocol described in the WebSocket API specification. It can be
+  // read via GetProtocol().
+  scoped_refptr<StringVar> protocol_;
+
+  // Represents url described in the WebSocket API specification. It can be
+  // read via GetURL().
+  scoped_refptr<StringVar> url_;
+
+  // Keeps the number of bytes of application data that have been queued using
+  // SendMessage(). WebKit side implementation calculates the actual amount.
+  // This is a cached value which is notified through a WebKit callback.
+  // This value is used to calculate bufferedAmount in the WebSocket API
+  // specification. The calculated value can be read via GetBufferedAmount().
+  uint64_t buffered_amount_;
+
+  // Keeps the number of bytes of application data that have been ignored
+  // because the connection was already closed.
+  // This value is used to calculate bufferedAmount in the WebSocket API
+  // specification. The calculated value can be read via GetBufferedAmount().
+  uint64_t buffered_amount_after_close_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebSocketResource);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_WEBSOCKET_RESOURCE_H_