Chromoting: Implemented security attention sequence (SAS) emulation on Windows.

remoting/host/session_event_executor_win.cc

+// 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.
+
+#include "remoting/host/session_event_executor_win.h"
+
+#include <string>
+
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "base/compiler_specific.h"
+#include "base/message_loop.h"
+#include "ipc/ipc_channel.h"
+#include "ipc/ipc_channel_proxy.h"
+#include "remoting/proto/event.pb.h"
+#include "ui/base/keycodes/keyboard_codes.h"
+
+#include "remoting/host/chromoting_messages.h"
+
+namespace {
+
+// The command line switch specifying the name of the session IPC channel.
+const char kProcessChannelId[] = "channel";
+
+} // namespace
+
+namespace remoting {
+
+using protocol::MouseEvent;
+using protocol::KeyEvent;
+
+SessionEventExecutorWin::SessionEventExecutorWin(
+    MessageLoop* message_loop,
+    base::MessageLoopProxy* io_message_loop,
+    scoped_ptr<protocol::InputStub> nested_executor)
+    : nested_executor_(nested_executor.Pass()),
+      message_loop_(message_loop),
+      scroll_pressed_(false) {
+  std::string channel_name =
+      CommandLine::ForCurrentProcess()->GetSwitchValueASCII(kProcessChannelId);
+
+  // Connect to the Chromoting IPC channel if the name was passed in the command
+  // line.
+  if (!channel_name.empty()) {
+    chromoting_channel_.reset(new IPC::ChannelProxy(
+                                      channel_name,
+                                      IPC::Channel::MODE_CLIENT,
+                                      this,
+                                      io_message_loop));
+  }
+}
+
+SessionEventExecutorWin::~SessionEventExecutorWin() {
+}
+
+void SessionEventExecutorWin::InjectKeyEvent(const KeyEvent& event) {
+  if (MessageLoop::current() != message_loop_) {
+    message_loop_->PostTask(
+        FROM_HERE,
+        base::Bind(&SessionEventExecutorWin::InjectKeyEvent,
+                   base::Unretained(this), event));
+    return;
+  }
+
+  // Poor man's Ctrl+Alt+Delete emulation: a double Scroll Lock is converted to
+  // the Secure Attention Sequence.
+  // TODO(alexeypa): replace this with proper SAS handling.
+  if (chromoting_channel_.get() != NULL && event.keycode() == VK_SCROLL) {
+    if (event.pressed()) {
+      if (scroll_pressed_) {
+        chromoting_channel_->Send(new ChromotingHostMsg_SendSasToConsole());
+        scroll_pressed_ = false;
+      } else {
+        scroll_pressed_ = true;
+      }
+    }
+  } else {
+    scroll_pressed_ = false;
+  }
+
+  nested_executor_->InjectKeyEvent(event);
+}
+
+void SessionEventExecutorWin::InjectMouseEvent(const MouseEvent& event) {
+  if (MessageLoop::current() != message_loop_) {
+    message_loop_->PostTask(
+        FROM_HERE,
+        base::Bind(&SessionEventExecutorWin::InjectMouseEvent,
+                   base::Unretained(this), event));
+    return;
+  }
+
+  nested_executor_->InjectMouseEvent(event);
+}
+
+bool SessionEventExecutorWin::OnMessageReceived(const IPC::Message& message) {
+  return false;
+}
+
+}  // namespace remoting