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// 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 "remoting/host/client_session.h"
#include "base/task.h"
#include "remoting/host/user_authenticator.h"
#include "remoting/proto/auth.pb.h"
#include "remoting/proto/event.pb.h"
// The number of remote mouse events to record for the purpose of eliminating
// "echoes" detected by the local input detector. The value should be large
// enough to cope with the fact that multiple events might be injected before
// any echoes are detected.
static const unsigned int kNumRemoteMousePositions = 50;
// The number of milliseconds for which to block remote input when local input
// is received.
static const int64 kRemoteBlockTimeoutMillis = 2000;
namespace remoting {
ClientSession::ClientSession(
EventHandler* event_handler,
UserAuthenticator* user_authenticator,
scoped_refptr<protocol::ConnectionToClient> connection,
protocol::InputStub* input_stub)
: event_handler_(event_handler),
user_authenticator_(user_authenticator),
connection_(connection),
input_stub_(input_stub),
authenticated_(false),
awaiting_continue_approval_(false),
remote_mouse_button_state_(0) {
}
ClientSession::~ClientSession() {
}
void ClientSession::BeginSessionRequest(
const protocol::LocalLoginCredentials* credentials, Task* done) {
DCHECK(event_handler_);
base::ScopedTaskRunner done_runner(done);
bool success = false;
switch (credentials->type()) {
case protocol::PASSWORD:
success = user_authenticator_->Authenticate(credentials->username(),
credentials->credential());
break;
default:
LOG(ERROR) << "Invalid credentials type " << credentials->type();
break;
}
OnAuthorizationComplete(success);
}
void ClientSession::OnAuthorizationComplete(bool success) {
if (success) {
authenticated_ = true;
event_handler_->LocalLoginSucceeded(connection_.get());
} else {
LOG(WARNING) << "Login failed";
event_handler_->LocalLoginFailed(connection_.get());
}
}
void ClientSession::InjectKeyEvent(const protocol::KeyEvent* event,
Task* done) {
base::ScopedTaskRunner done_runner(done);
if (authenticated_ && !ShouldIgnoreRemoteKeyboardInput(event)) {
RecordKeyEvent(event);
input_stub_->InjectKeyEvent(event, done_runner.Release());
}
}
void ClientSession::InjectMouseEvent(const protocol::MouseEvent* event,
Task* done) {
base::ScopedTaskRunner done_runner(done);
if (authenticated_ && !ShouldIgnoreRemoteMouseInput(event)) {
if (event->has_button() && event->has_button_down()) {
if (event->button() >= 1 && event->button() < 32) {
uint32 button_change = 1 << (event->button() - 1);
if (event->button_down()) {
remote_mouse_button_state_ |= button_change;
} else {
remote_mouse_button_state_ &= ~button_change;
}
}
}
if (event->has_x() && event->has_y()) {
gfx::Point pos(event->x(), event->y());
recent_remote_mouse_positions_.push_back(pos);
if (recent_remote_mouse_positions_.size() > kNumRemoteMousePositions) {
recent_remote_mouse_positions_.pop_front();
}
}
input_stub_->InjectMouseEvent(event, done_runner.Release());
}
}
void ClientSession::Disconnect() {
connection_->Disconnect();
UnpressKeys();
authenticated_ = false;
}
void ClientSession::LocalMouseMoved(const gfx::Point& mouse_pos) {
// If this is a genuine local input event (rather than an echo of a remote
// input event that we've just injected), then ignore remote inputs for a
// short time.
if (!recent_remote_mouse_positions_.empty() &&
mouse_pos == *recent_remote_mouse_positions_.begin()) {
recent_remote_mouse_positions_.pop_front();
} else {
latest_local_input_time_ = base::Time::Now();
}
}
bool ClientSession::ShouldIgnoreRemoteMouseInput(
const protocol::MouseEvent* event) const {
// If the last remote input event was a click or a drag, then it's not safe
// to block remote mouse events. For example, it might result in the host
// missing the mouse-up event and being stuck with the button pressed.
if (remote_mouse_button_state_ != 0)
return false;
// Otherwise, if the host user has not yet approved the continuation of the
// connection, then ignore remote mouse events.
if (awaiting_continue_approval_)
return true;
// Otherwise, ignore remote mouse events if the local mouse moved recently.
int64 millis = (base::Time::Now() - latest_local_input_time_)
.InMilliseconds();
if (millis < kRemoteBlockTimeoutMillis)
return true;
return false;
}
bool ClientSession::ShouldIgnoreRemoteKeyboardInput(
const protocol::KeyEvent* event) const {
// If the host user has not yet approved the continuation of the connection,
// then all remote keyboard input is ignored, except to release keys that
// were already pressed.
if (awaiting_continue_approval_) {
return event->pressed() ||
(pressed_keys_.find(event->keycode()) == pressed_keys_.end());
}
return false;
}
void ClientSession::RecordKeyEvent(const protocol::KeyEvent* event) {
if (event->pressed()) {
pressed_keys_.insert(event->keycode());
} else {
pressed_keys_.erase(event->keycode());
}
}
void ClientSession::UnpressKeys() {
std::set<int>::iterator i;
for (i = pressed_keys_.begin(); i != pressed_keys_.end(); ++i) {
protocol::KeyEvent key;
key.set_keycode(*i);
key.set_pressed(false);
input_stub_->InjectKeyEvent(&key, NULL);
}
pressed_keys_.clear();
}
} // namespace remoting
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