public function postMessage()
{
switch (Request::input('target_type')) {
case 'channel':
$target = Channel::findOrFail(Request::input('channel_id'));
break;
case 'user':
$target = User::findOrFail(Request::input('user_id'));
break;
default:
abort(422);
}
priv_check('ChatMessageSend', $target)->ensureCan();
$target->sendMessage(Auth::user(), Request::input('message'));
return json_encode('ok');
}