1
    2
    3
    4
    5
    6
    7
    8
    9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
  100
  101
  102
  103
  104
  105
  106
  107


content / browser / screenlock_monitor / screenlock_monitor_device_source_win.cc [blame]

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/screenlock_monitor/screenlock_monitor_device_source.h"

#include <memory>

#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/task/thread_pool.h"
#include "ui/gfx/win/singleton_hwnd.h"
#include "ui/gfx/win/singleton_hwnd_observer.h"

namespace content {
namespace {
bool RegisterForSessionNotifications(HWND hwnd, DWORD flag) {
  base::OnceClosure wts_register = base::BindOnce(
      base::IgnoreResult(&::WTSRegisterSessionNotification), hwnd, flag);

  base::ThreadPool::CreateCOMSTATaskRunner({})->PostTask(
      FROM_HERE, std::move(wts_register));

  return true;
}

bool UnregisterFromSessionNotifications(HWND hwnd) {
  return ::WTSUnRegisterSessionNotification(hwnd);
}
}  // namespace

// Set static member function pointers with default (non-fake) APIs.
ScreenlockMonitorDeviceSource::WTSRegisterSessionNotificationFunction
    ScreenlockMonitorDeviceSource::SessionMessageWindow::
        register_session_notification_function_ =
            &RegisterForSessionNotifications;

ScreenlockMonitorDeviceSource::WTSUnRegisterSessionNotificationFunction
    ScreenlockMonitorDeviceSource::SessionMessageWindow::
        unregister_session_notification_function_ =
            &UnregisterFromSessionNotifications;

// static
void ScreenlockMonitorDeviceSource::SetFakeNotificationAPIsForTesting(
    WTSRegisterSessionNotificationFunction register_function,
    WTSUnRegisterSessionNotificationFunction unregister_function) {
  SessionMessageWindow::SetFakeNotificationAPIsForTesting(register_function,
                                                          unregister_function);
}

// static
void ScreenlockMonitorDeviceSource::SessionMessageWindow::
    SetFakeNotificationAPIsForTesting(
        WTSRegisterSessionNotificationFunction register_function,
        WTSUnRegisterSessionNotificationFunction unregister_function) {
  register_session_notification_function_ = register_function;
  unregister_session_notification_function_ = unregister_function;
}

ScreenlockMonitorDeviceSource::SessionMessageWindow::SessionMessageWindow() {
  // Create a singleton observer for receiving session change notifications.
  // base:Unretained() is safe because the observer handles the correct
  // cleanup if either the SingletonHwnd or forwarded object is destroyed
  // first.
  singleton_hwnd_observer_ =
      std::make_unique<gfx::SingletonHwndObserver>(base::BindRepeating(
          &ScreenlockMonitorDeviceSource::SessionMessageWindow::OnWndProc,
          base::Unretained(this)));

  // Use NOTIFY_FOR_THIS_SESSION so we only receive events from the current
  // session, and not from other users connected to the same session host.
  bool registered = register_session_notification_function_(
      gfx::SingletonHwnd::GetInstance()->hwnd(), NOTIFY_FOR_THIS_SESSION);
  DCHECK(registered);
}

ScreenlockMonitorDeviceSource::SessionMessageWindow::~SessionMessageWindow() {}

void ScreenlockMonitorDeviceSource::SessionMessageWindow::OnWndProc(
    HWND hwnd,
    UINT message,
    WPARAM wparam,
    LPARAM lparam) {
  if (message == WM_WTSSESSION_CHANGE) {
    ProcessWTSSessionLockMessage(wparam);
  }
}

void ScreenlockMonitorDeviceSource::SessionMessageWindow::
    ProcessWTSSessionLockMessage(WPARAM event_id) {
  ScreenlockEvent screenlock_event;
  switch (event_id) {
    case WTS_SESSION_LOCK:
      screenlock_event = SCREEN_LOCK_EVENT;
      break;
    case WTS_SESSION_UNLOCK:
      screenlock_event = SCREEN_UNLOCK_EVENT;
      break;
    default:
      return;
  }

  ProcessScreenlockEvent(screenlock_event);
}

}  // namespace content