WebSocket Pepper API: in process API implementation (reland)

webkit/plugins/ppapi/ppb_websocket_impl.cc

 // Copyright (c) 2011 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.
 
 #include "webkit/plugins/ppapi/ppb_websocket_impl.h"
 
+#include <string>
+
+#include "base/logging.h"
+#include "googleurl/src/gurl.h"
+#include "net/base/net_util.h"
+#include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/pp_var.h"
+#include "ppapi/c/ppb_var.h"
+#include "ppapi/shared_impl/var.h"
+#include "ppapi/shared_impl/var_tracker.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebData.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebElement.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPluginContainer.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebSocket.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebURL.h"
+#include "webkit/plugins/ppapi/host_globals.h"
+#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
+#include "webkit/plugins/ppapi/resource_helper.h"
 
+using ppapi::PpapiGlobals;
+using ppapi::StringVar;
 using ppapi::thunk::PPB_WebSocket_API;
+using ppapi::VarTracker;
+using WebKit::WebData;
+using WebKit::WebDocument;
+using WebKit::WebString;
+using WebKit::WebSocket;
+using WebKit::WebSocketClient;
+using WebKit::WebURL;
+
+static const uint32_t kMaxReasonSizeInBytes = 123;
 
 namespace webkit {
 namespace ppapi {
 
 PPB_WebSocket_Impl::PPB_WebSocket_Impl(PP_Instance instance)
-    : Resource(instance) {
+    : Resource(instance),
+      state_(PP_WEBSOCKETREADYSTATE_INVALID_DEV),
+      receive_callback_var_(NULL),
+      wait_for_receive_(false),
+      close_code_(0),
+      close_was_clean_(PP_FALSE) {
+  empty_string_ = new StringVar(
+      PpapiGlobals::Get()->GetModuleForInstance(instance), "", 0);
 }
 
 PPB_WebSocket_Impl::~PPB_WebSocket_Impl() {
+  if (websocket_.get())
+    websocket_->disconnect();
+
+  // Clean up received and unread messages
+  VarTracker* var_tracker = PpapiGlobals::Get()->GetVarTracker();
+  while (!received_messages_.empty()) {
+    PP_Var var = received_messages_.front();
+    received_messages_.pop();
+    var_tracker->ReleaseVar(var);
+  }
 }
 
 // static
 PP_Resource PPB_WebSocket_Impl::Create(PP_Instance instance) {
   scoped_refptr<PPB_WebSocket_Impl> ws(new PPB_WebSocket_Impl(instance));
   return ws->GetReference();
 }
 
 PPB_WebSocket_API* PPB_WebSocket_Impl::AsPPB_WebSocket_API() {
   return this;
 }
 
 int32_t PPB_WebSocket_Impl::Connect(PP_Var url,
                                     const PP_Var protocols[],
                                     uint32_t protocol_count,
                                     PP_CompletionCallback callback) {
-  // TODO(toyoshim): Implement it.
-  return PP_ERROR_NOTSUPPORTED;
+  // Check mandatory interfaces.
+  PluginInstance* plugin_instance = ResourceHelper::GetPluginInstance(this);
+  DCHECK(plugin_instance);
+  if (!plugin_instance)
+    return PP_ERROR_FAILED;
+
+  // Connect() can be called at most once.
+  if (websocket_.get())
+    return PP_ERROR_INPROGRESS;
+  if (state_ != PP_WEBSOCKETREADYSTATE_INVALID_DEV)
+    return PP_ERROR_INPROGRESS;
+  state_ = PP_WEBSOCKETREADYSTATE_CLOSED_DEV;
+
+  // Validate |callback| (Doesn't support blocking callback)
+  if (!callback.func)
+    return PP_ERROR_BLOCKS_MAIN_THREAD;
+
+  // Validate url and convert it to WebURL.
+  scoped_refptr<StringVar> url_string = StringVar::FromPPVar(url);
+  if (!url_string)
+    return PP_ERROR_BADARGUMENT;
+  GURL gurl(url_string->value());
+  if (!gurl.is_valid())
+    return PP_ERROR_BADARGUMENT;
+  if (!gurl.SchemeIs("ws") && !gurl.SchemeIs("wss"))
+    return PP_ERROR_BADARGUMENT;
+  if (gurl.has_ref())
+    return PP_ERROR_BADARGUMENT;
+  // TODO(toyoshim): Must check if the port is allowed by default.
+  // We could not just use net::IsPortAllowedByDefault() because it doesn't
+  // be exported over the shared library.
+  WebURL web_url(gurl);
+
+  // Validate protocols and convert it to WebString.
+  // TODO(toyoshim): Detect duplicated protocols as error.
+  std::string protocol_string;
+  for (uint32_t i = 0; i < protocol_count; i++) {
+    // TODO(toyoshim): Similar function exist in WebKit::WebSocket.
+    // We must rearrange them into WebKit::WebChannel and share its protocol
+    // related implementation via WebKit API.
+    scoped_refptr<StringVar> string_var;
+    string_var = StringVar::FromPPVar(protocols[i]);
+    if (!string_var || !string_var->value().length())
+      return PP_ERROR_BADARGUMENT;
+    for (std::string::const_iterator it = string_var->value().begin();
+        it != string_var->value().end();
+        ++it) {
+      uint8_t character = static_cast<uint8_t>(*it);
+      // WebSocket specification says "(Subprotocol string must consist of)
+      // characters in the range U+0021 to U+007E not including separator
+      // characters as defined in [RFC2616]."
+      const uint8_t minimumProtocolCharacter = '!';  // U+0021.
+      const uint8_t maximumProtocolCharacter = '~';  // U+007E.
+      if (character < minimumProtocolCharacter ||
+          character > maximumProtocolCharacter ||
+          character == '"' || character == '(' || character == ')' ||
+          character == ',' || character == '/' ||
+          (character >= ':' && character <= '@') ||  // U+003A - U+0040
+          (character >= '[' && character <= ']') ||  // U+005B - u+005D
+          character == '{' || character == '}')
+        return PP_ERROR_BADARGUMENT;
+    }
+    if (i != 0)
+      protocol_string.append(",");
+    protocol_string.append(string_var->value());
+  }
+  WebString web_protocols = WebString::fromUTF8(protocol_string);
+
+  // Create WebKit::WebSocket object.
+  WebDocument document = plugin_instance->container()->element().document();
+  websocket_.reset(WebSocket::create(document, this));
+  DCHECK(websocket_.get());
+  if (!websocket_.get())
+    return PP_ERROR_NOTSUPPORTED;
+
+  websocket_->connect(web_url, web_protocols);
+  state_ = PP_WEBSOCKETREADYSTATE_CONNECTING_DEV;
+
+  // Install callback.
+  connect_callback_ = callback;
+
+  return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t PPB_WebSocket_Impl::Close(uint16_t code,
                                   PP_Var reason,
                                   PP_CompletionCallback callback) {
-  // TODO(toyoshim): Implement it.
-  return PP_ERROR_NOTSUPPORTED;
+  // Check mandarory interfaces.
+  if (!websocket_.get())
+    return PP_ERROR_FAILED;
+
+  // Validate |callback| (Doesn't support blocking callback)
+  if (!callback.func)
+    return PP_ERROR_BLOCKS_MAIN_THREAD;
+
+  // Validate |code|.
+  if (code != WebSocket::CloseEventCodeNotSpecified) {
+    if (!(code == WebSocket::CloseEventCodeNormalClosure ||
+        (WebSocket::CloseEventCodeMinimumUserDefined <= code &&
+        code <= WebSocket::CloseEventCodeMaximumUserDefined)))
+    return PP_ERROR_NOACCESS;
+  }
+  // Validate |reason|.
+  // TODO(toyoshim): Returns PP_ERROR_BADARGUMENT if |reason| contains any
+  // surrogates.
+  scoped_refptr<StringVar> reason_string = StringVar::FromPPVar(reason);
+  if (!reason_string || reason_string->value().size() > kMaxReasonSizeInBytes)
+    return PP_ERROR_BADARGUMENT;
+
+  // Check state.
+  if (state_ == PP_WEBSOCKETREADYSTATE_CLOSING_DEV ||
+      state_ == PP_WEBSOCKETREADYSTATE_CLOSED_DEV)
+    return PP_ERROR_INPROGRESS;
+
+  // Install |callback|.
+  close_callback_ = callback;
+
+  if (state_ == PP_WEBSOCKETREADYSTATE_CONNECTING_DEV) {
+    state_ = PP_WEBSOCKETREADYSTATE_CLOSING_DEV;
+    PP_RunAndClearCompletionCallback(&connect_callback_, PP_ERROR_ABORTED);
+    websocket_->fail(
+        "WebSocket was closed before the connection was established.");
+    return PP_OK_COMPLETIONPENDING;
+  }
+
+  // TODO(toyoshim): Handle bufferedAmount here.
+
+  state_ = PP_WEBSOCKETREADYSTATE_CLOSING_DEV;
+  WebString web_reason = WebString::fromUTF8(reason_string->value());
+  websocket_->close(code, web_reason);
+
+  return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t PPB_WebSocket_Impl::ReceiveMessage(PP_Var* message,
                                            PP_CompletionCallback callback) {
-  // TODO(toyoshim): Implement it.
-  return PP_ERROR_NOTSUPPORTED;
+  // Check state.
+  if (state_ == PP_WEBSOCKETREADYSTATE_INVALID_DEV ||
+      state_ == PP_WEBSOCKETREADYSTATE_CONNECTING_DEV)
+    return PP_ERROR_BADARGUMENT;
+
+  // Just return received message if any received message is queued.
+  if (!received_messages_.empty())
+    return DoReceive();
+
+  // Or retain |message| as buffer to store and install |callback|.
+  wait_for_receive_ = true;
+  receive_callback_var_ = message;
+  receive_callback_ = callback;
+
+  return PP_OK_COMPLETIONPENDING;
 }
 
 int32_t PPB_WebSocket_Impl::SendMessage(PP_Var message) {
-  // TODO(toyoshim): Implement it.
-  return PP_ERROR_NOTSUPPORTED;
+  // Check mandatory interfaces.
+  if (!websocket_.get())
+    return PP_ERROR_FAILED;
+
+  // Check state.
+  if (state_ == PP_WEBSOCKETREADYSTATE_INVALID_DEV ||
+      state_ == PP_WEBSOCKETREADYSTATE_CONNECTING_DEV)
+    return PP_ERROR_BADARGUMENT;
+
+  if (state_ == PP_WEBSOCKETREADYSTATE_CLOSING_DEV ||
+      state_ == PP_WEBSOCKETREADYSTATE_CLOSED_DEV) {
+    // TODO(toyoshim): Handle bufferedAmount here.
+  }
+
+  if (message.type != PP_VARTYPE_STRING) {
+    // TODO(toyoshim): Support binary data.
+    return PP_ERROR_NOTSUPPORTED;
+  }
+
+  // Convert message to WebString.
+  scoped_refptr<StringVar> message_string = StringVar::FromPPVar(message);
+  if (!message_string)
+    return PP_ERROR_BADARGUMENT;
+  WebString web_message = WebString::fromUTF8(message_string->value());
+  if (!websocket_->sendText(web_message))
+    return PP_ERROR_BADARGUMENT;
+
+  return PP_OK;
 }
 
 uint64_t PPB_WebSocket_Impl::GetBufferedAmount() {
-  // TODO(toyoshim): Implement it.
+  // TODO(toyoshim): Implement.
   return 0;
 }
 
 uint16_t PPB_WebSocket_Impl::GetCloseCode() {
-  // TODO(toyoshim): Implement it.
-  return 0;
+  return close_code_;
 }
 
 PP_Var PPB_WebSocket_Impl::GetCloseReason() {
-  // TODO(toyoshim): Implement it.
-  return PP_MakeUndefined();
+  if (!close_reason_)
+    return empty_string_->GetPPVar();
+  return close_reason_->GetPPVar();
 }
 
 PP_Bool PPB_WebSocket_Impl::GetCloseWasClean() {
-  // TODO(toyoshim): Implement it.
-  return PP_FALSE;
+  return close_was_clean_;
 }
 
 PP_Var PPB_WebSocket_Impl::GetExtensions() {
-  // TODO(toyoshim): Implement it.
-  return PP_MakeUndefined();
+  // TODO(toyoshim): For now, always returns empty string.
+  if (!extensions_)
+    return empty_string_->GetPPVar();
+  return extensions_->GetPPVar();
 }
 
 PP_Var PPB_WebSocket_Impl::GetProtocol() {
-  // TODO(toyoshim): Implement it.
-  return PP_MakeUndefined();
+  // TODO(toyoshim): Implement.
+  if (!protocol_)
+    return empty_string_->GetPPVar();
+  return protocol_->GetPPVar();
 }
 
 PP_WebSocketReadyState_Dev PPB_WebSocket_Impl::GetReadyState() {
-  // TODO(toyoshim): Implement it.
-  return PP_WEBSOCKETREADYSTATE_INVALID_DEV;
+  return state_;
 }
 
 PP_Var PPB_WebSocket_Impl::GetURL() {
-  // TODO(toyoshim): Implement it.
-  return PP_MakeUndefined();
+  // TODO(toyoshim): For now, always returns empty string.
+  if (!url_)
+    return empty_string_->GetPPVar();
+  return url_->GetPPVar();
+}
+
+void PPB_WebSocket_Impl::didConnect() {
+  DCHECK_EQ(PP_WEBSOCKETREADYSTATE_CONNECTING_DEV, state_);
+  state_ = PP_WEBSOCKETREADYSTATE_OPEN_DEV;
+  PP_RunAndClearCompletionCallback(&connect_callback_, PP_OK);
+}
+
+void PPB_WebSocket_Impl::didReceiveMessage(const WebString& message) {
+  // Append received data to queue.
+  std::string string = message.utf8();
+  PP_Var var = StringVar::StringToPPVar(
+      PpapiGlobals::Get()->GetModuleForInstance(pp_instance()), string);
+  received_messages_.push(var);
+
+  if (!wait_for_receive_)
+    return;
+
+  PP_RunAndClearCompletionCallback(&receive_callback_, DoReceive());
+}
+
+void PPB_WebSocket_Impl::didReceiveBinaryData(const WebData& binaryData) {
+  DLOG(INFO) << "didReceiveBinaryData is not implemented yet.";
+  // TODO(toyoshim): Support to receive binary data.
+}
+
+void PPB_WebSocket_Impl::didReceiveMessageError() {
+  // TODO(toyoshim): Must implement.
+  DLOG(INFO) << "didReceiveMessageError is not implemented yet.";
+}
+
+void PPB_WebSocket_Impl::didStartClosingHandshake() {
+  // TODO(toyoshim): Must implement.
+  DLOG(INFO) << "didStartClosingHandshake is not implemented yet.";
+}
+
+void PPB_WebSocket_Impl::didClose(unsigned long bufferedAmount,
+                                  ClosingHandshakeCompletionStatus status,
+                                  unsigned short code,
+                                  const WebString& reason) {
+  // Store code and reason.
+  close_code_ = code;
+  std::string reason_string = reason.utf8();
+  close_reason_ = new StringVar(
+      PpapiGlobals::Get()->GetModuleForInstance(pp_instance()), reason_string);
+
+  // TODO(toyoshim): Set close_was_clean_.
+
+  // Handle state transition and invoking callback.
+  DCHECK_NE(PP_WEBSOCKETREADYSTATE_CLOSED_DEV, state_);
+  PP_WebSocketReadyState_Dev state = state_;
+  state_ = PP_WEBSOCKETREADYSTATE_CLOSED_DEV;
+
+  if (state == PP_WEBSOCKETREADYSTATE_CONNECTING_DEV)
+    PP_RunAndClearCompletionCallback(&connect_callback_, PP_OK);
+
+  if (state == PP_WEBSOCKETREADYSTATE_CLOSING_DEV)
+    PP_RunAndClearCompletionCallback(&close_callback_, PP_OK);
+}
+
+int32_t PPB_WebSocket_Impl::DoReceive() {
+  // TODO(toyoshim): Check state.
+
+  if (!receive_callback_var_)
+    return PP_OK;
+
+  *receive_callback_var_ = received_messages_.front();
+  received_messages_.pop();
+  receive_callback_var_ = NULL;
+  wait_for_receive_ = false;
+  return PP_OK;
 }
 
 }  // namespace ppapi
 }  // namespace webkit