Request.php
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Request.php
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	<?php
	/**
	* This file is part of the TelegramBot package.
	*
	* (c) Avtandil Kikabidze aka LONGMAN <akalongman@gmail.com>
	*
	* For the full copyright and license information, please view the LICENSE
	* file that was distributed with this source code.
	*/

	namespace Longman\TelegramBot;

	use GuzzleHttp\Client;
	use GuzzleHttp\Exception\RequestException;
	use Longman\TelegramBot\Entities\File;
	use Longman\TelegramBot\Entities\ServerResponse;
	use Longman\TelegramBot\Exception\TelegramException;

	class Request
	{
	/**
	* Telegram object
	*
	* @var \Longman\TelegramBot\Telegram
	*/
	private static $telegram;

	/**
	* URI of the Telegram API
	*
	* @var string
	*/
	private static $api_base_uri = 'https://api.telegram.org';

	/**
	* Guzzle Client object
	*
	* @var \GuzzleHttp\Client
	*/
	private static $client;

	/**
	* Input value of the request
	*
	* @var string
	*/
	private static $input;

	/**
	* Request limiter
	*
	* @var boolean
	*/
	private static $limiter_enabled;

	/**
	* Request limiter's interval between checks
	*
	* @var boolean
	*/
	private static $limiter_interval;

	/**
	* Available actions to send
	*
	* @var array
	*/
	private static $actions = [
	'getUpdates',
	'setWebhook',
	'deleteWebhook',
	'getMe',
	'sendMessage',
	'forwardMessage',
	'sendPhoto',
	'sendAudio',
	'sendDocument',
	'sendSticker',
	'sendVideo',
	'sendVoice',
	'sendLocation',
	'sendVenue',
	'sendContact',
	'sendChatAction',
	'getUserProfilePhotos',
	'getFile',
	'kickChatMember',
	'leaveChat',
	'unbanChatMember',
	'getChat',
	'getChatAdministrators',
	'getChatMember',
	'getChatMembersCount',
	'answerCallbackQuery',
	'answerInlineQuery',
	'editMessageText',
	'editMessageCaption',
	'editMessageReplyMarkup',
	'getWebhookInfo',
	];

	/**
	* Initialize
	*
	* @param \Longman\TelegramBot\Telegram $telegram
	*
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function initialize(Telegram $telegram)
	{
	if (is_object($telegram)) {
	self::$telegram = $telegram;
	self::$client = new Client(['base_uri' => self::$api_base_uri]);
	} else {
	throw new TelegramException('Telegram pointer is empty!');
	}
	}

	/**
	* Set input from custom input or stdin and return it
	*
	* @return string
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getInput()
	{
	// First check if a custom input has been set, else get the PHP input.
	if (!($input = self::$telegram->getCustomInput())) {
	$input = file_get_contents('php://input');
	}

	// Make sure we have a string to work with.
	if (is_string($input)) {
	self::$input = $input;
	} else {
	throw new TelegramException('Input must be a string!');
	}

	TelegramLog::update(self::$input);

	return self::$input;
	}

	/**
	* Generate general fake server response
	*
	* @param array $data Data to add to fake response
	*
	* @return array Fake response data
	*/
	public static function generateGeneralFakeServerResponse(array $data = [])
	{
	//PARAM BINDED IN PHPUNIT TEST FOR TestServerResponse.php
	//Maybe this is not the best possible implementation

	//No value set in $data ie testing setWebhook
	//Provided $data['chat_id'] ie testing sendMessage

	$fake_response = ['ok' => true]; // :)

	if ($data === []) {
	$fake_response['result'] = true;
	}

	//some data to let iniatilize the class method SendMessage
	if (isset($data['chat_id'])) {
	$data['message_id'] = '1234';
	$data['date'] = '1441378360';
	$data['from'] = [
	'id' => 123456789,
	'first_name' => 'botname',
	'username' => 'namebot',
	];
	$data['chat'] = ['id' => $data['chat_id']];

	$fake_response['result'] = $data;
	}

	return $fake_response;
	}

	/**
	* Properly set up the request params
	*
	* If any item of the array is a resource, reformat it to a multipart request.
	* Else, just return the passed data as form params.
	*
	* @param array $data
	*
	* @return array
	*/
	private static function setUpRequestParams(array $data)
	{
	$has_resource = false;
	$multipart = [];

	// Convert any nested arrays into JSON strings.
	array_walk($data, function (&$item) {
	is_array($item) && $item = json_encode($item);
	});

	//Reformat data array in multipart way if it contains a resource
	foreach ($data as $key => $item) {
	$has_resource \|= is_resource($item);
	$multipart[] = ['name' => $key, 'contents' => $item];
	}
	if ($has_resource) {
	return ['multipart' => $multipart];
	}

	return ['form_params' => $data];
	}

	/**
	* Execute HTTP Request
	*
	* @param string $action Action to execute
	* @param array $data Data to attach to the execution
	*
	* @return string Result of the HTTP Request
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function execute($action, array $data = [])
	{
	//Fix so that the keyboard markup is a string, not an object
	if (isset($data['reply_markup'])) {
	$data['reply_markup'] = json_encode($data['reply_markup']);
	}

	$result = null;
	$request_params = self::setUpRequestParams($data);
	$request_params['debug'] = TelegramLog::getDebugLogTempStream();

	try {
	$response = self::$client->post(
	'/bot' . self::$telegram->getApiKey() . '/' . $action,
	$request_params
	);
	$result = (string) $response->getBody();

	//Logging getUpdates Update
	if ($action === 'getUpdates') {
	TelegramLog::update($result);
	}
	} catch (RequestException $e) {
	$result = ($e->getResponse()) ? (string) $e->getResponse()->getBody() : '';
	} finally {
	//Logging verbose debug output
	TelegramLog::endDebugLogTempStream('Verbose HTTP Request output:' . PHP_EOL . '%s' . PHP_EOL);
	}

	return $result;
	}

	/**
	* Download file
	*
	* @param \Longman\TelegramBot\Entities\File $file
	*
	* @return boolean
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function downloadFile(File $file)
	{
	$tg_file_path = $file->getFilePath();
	$file_path = self::$telegram->getDownloadPath() . '/' . $tg_file_path;

	$file_dir = dirname($file_path);
	//For safety reasons, first try to create the directory, then check that it exists.
	//This is in case some other process has created the folder in the meantime.
	if (!@mkdir($file_dir, 0755, true) && !is_dir($file_dir)) {
	throw new TelegramException('Directory ' . $file_dir . ' can\'t be created');
	}

	$debug_handle = TelegramLog::getDebugLogTempStream();

	try {
	self::$client->get(
	'/file/bot' . self::$telegram->getApiKey() . '/' . $tg_file_path,
	['debug' => $debug_handle, 'sink' => $file_path]
	);

	return filesize($file_path) > 0;
	} catch (RequestException $e) {
	return ($e->getResponse()) ? (string) $e->getResponse()->getBody() : '';
	} finally {
	//Logging verbose debug output
	TelegramLog::endDebugLogTempStream('Verbose HTTP File Download Request output:' . PHP_EOL . '%s' . PHP_EOL);
	}
	}

	/**
	* Encode file
	*
	* @param string $file
	*
	* @return resource
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	protected static function encodeFile($file)
	{
	$fp = fopen($file, 'r');
	if ($fp === false) {
	throw new TelegramException('Cannot open "' . $file . '" for reading');
	}

	return $fp;
	}

	/**
	* Send command
	*
	* @todo Fake response doesn't need json encoding?
	*
	* @param string $action
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function send($action, array $data = [])
	{
	self::ensureValidAction($action);

	$bot_username = self::$telegram->getBotUsername();

	if (defined('PHPUNIT_TESTSUITE')) {
	$fake_response = self::generateGeneralFakeServerResponse($data);

	return new ServerResponse($fake_response, $bot_username);
	}

	self::ensureNonEmptyData($data);

	self::limitTelegramRequests($action, $data);

	$response = json_decode(self::execute($action, $data), true);

	if (null === $response) {
	throw new TelegramException('Telegram returned an invalid response! Please review your bot name and API key.');
	}

	return new ServerResponse($response, $bot_username);
	}

	/**
	* Make sure the data isn't empty, else throw an exception
	*
	* @param array $data
	*
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	private static function ensureNonEmptyData(array $data)
	{
	if (count($data) === 0) {
	throw new TelegramException('Data is empty!');
	}
	}

	/**
	* Make sure the action is valid, else throw an exception
	*
	* @param string $action
	*
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	private static function ensureValidAction($action)
	{
	if (!in_array($action, self::$actions, true)) {
	throw new TelegramException('The action "' . $action . '" doesn\'t exist!');
	}
	}

	/**
	* Assign an encoded file to a data array
	*
	* @param array $data
	* @param string $field
	* @param string $file
	*
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	private static function assignEncodedFile(&$data, $field, $file)
	{
	if ($file !== null && $file !== '') {
	$data[$field] = self::encodeFile($file);
	}
	}

	/**
	* Returns basic information about the bot in form of a User object
	*
	* @link https://core.telegram.org/bots/api#getme
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getMe()
	{
	// Added fake parameter, because of some cURL version failed POST request without parameters
	// see https://github.com/php-telegram-bot/core/pull/228
	return self::send('getMe', ['whoami']);
	}

	/**
	* Use this method to send text messages. On success, the sent Message is returned
	*
	* @link https://core.telegram.org/bots/api#sendmessage
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendMessage(array $data)
	{
	$text = $data['text'];

	do {
	//Chop off and send the first message
	$data['text'] = mb_substr($text, 0, 4096);
	$response = self::send('sendMessage', $data);

	//Prepare the next message
	$text = mb_substr($text, 4096);
	} while (mb_strlen($text, 'UTF-8') > 0);

	return $response;
	}

	/**
	* Use this method to forward messages of any kind. On success, the sent Message is returned
	*
	* @link https://core.telegram.org/bots/api#forwardmessage
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function forwardMessage(array $data)
	{
	return self::send('forwardMessage', $data);
	}

	/**
	* Use this method to send photos. On success, the sent Message is returned
	*
	* @link https://core.telegram.org/bots/api#sendphoto
	*
	* @param array $data
	* @param string $file
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendPhoto(array $data, $file = null)
	{
	self::assignEncodedFile($data, 'photo', $file);

	return self::send('sendPhoto', $data);
	}

	/**
	* Use this method to send audio files
	*
	* Your audio must be in the .mp3 format. On success, the sent Message is returned.
	* Bots can currently send audio files of up to 50 MB in size, this limit may be changed in the future.
	* For sending voice messages, use the sendVoice method instead.
	*
	* @link https://core.telegram.org/bots/api#sendaudio
	*
	* @param array $data
	* @param string $file
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendAudio(array $data, $file = null)
	{
	self::assignEncodedFile($data, 'audio', $file);

	return self::send('sendAudio', $data);
	}

	/**
	* Use this method to send general files. On success, the sent Message is returned.
	*
	* Bots can currently send files of any type of up to 50 MB in size, this limit may be changed in the future.
	*
	* @link https://core.telegram.org/bots/api#senddocument
	*
	* @param array $data
	* @param string $file
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendDocument(array $data, $file = null)
	{
	self::assignEncodedFile($data, 'document', $file);

	return self::send('sendDocument', $data);
	}

	/**
	* Use this method to send .webp stickers. On success, the sent Message is returned.
	*
	* @link https://core.telegram.org/bots/api#sendsticker
	*
	* @param array $data
	* @param string $file
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendSticker(array $data, $file = null)
	{
	self::assignEncodedFile($data, 'sticker', $file);

	return self::send('sendSticker', $data);
	}

	/**
	* Use this method to send video files. On success, the sent Message is returned.
	*
	* Telegram clients support mp4 videos (other formats may be sent as Document).
	* Bots can currently send video files of up to 50 MB in size, this limit may be changed in the future.
	*
	* @link https://core.telegram.org/bots/api#sendvideo
	*
	* @param array $data
	* @param string $file
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendVideo(array $data, $file = null)
	{
	self::assignEncodedFile($data, 'video', $file);

	return self::send('sendVideo', $data);
	}

	/**
	* Use this method to send audio files. On success, the sent Message is returned.
	*
	* Telegram clients will display the file as a playable voice message.
	* For this to work, your audio must be in an .ogg file encoded with OPUS (other formats may be sent as Audio or Document).
	* Bots can currently send voice messages of up to 50 MB in size, this limit may be changed in the future.
	*
	* @link https://core.telegram.org/bots/api#sendvoice
	*
	* @param array $data
	* @param string $file
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendVoice(array $data, $file = null)
	{
	self::assignEncodedFile($data, 'voice', $file);

	return self::send('sendVoice', $data);
	}

	/**
	* Use this method to send point on the map. On success, the sent Message is returned.
	*
	* @link https://core.telegram.org/bots/api#sendlocation
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendLocation(array $data)
	{
	return self::send('sendLocation', $data);
	}

	/**
	* Use this method to send information about a venue. On success, the sent Message is returned.
	*
	* @link https://core.telegram.org/bots/api#sendvenue
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendVenue(array $data)
	{
	return self::send('sendVenue', $data);
	}

	/**
	* Use this method to send phone contacts. On success, the sent Message is returned.
	*
	* @link https://core.telegram.org/bots/api#sendcontact
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendContact(array $data)
	{
	return self::send('sendContact', $data);
	}

	/**
	* Use this method when you need to tell the user that something is happening on the bot's side.
	*
	* The status is set for 5 seconds or less.
	* (when a message arrives from your bot, Telegram clients clear its typing status)
	*
	* @link https://core.telegram.org/bots/api#sendchataction
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendChatAction(array $data)
	{
	return self::send('sendChatAction', $data);
	}

	/**
	* Use this method to get a list of profile pictures for a user. Returns a UserProfilePhotos object.
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getUserProfilePhotos(array $data)
	{
	return self::send('getUserProfilePhotos', $data);
	}

	/**
	* Use this method to get basic info about a file and prepare it for downloading. On success, a File object is returned.
	*
	* For the moment, bots can download files of up to 20MB in size.
	* The file can then be downloaded via the link https://api.telegram.org/file/bot<token>/<file_path>,
	* where <file_path> is taken from the response.
	* It is guaranteed that the link will be valid for at least 1 hour.
	* When the link expires, a new one can be requested by calling getFile again.
	*
	* @link https://core.telegram.org/bots/api#getfile
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getFile(array $data)
	{
	return self::send('getFile', $data);
	}

	/**
	* Use this method to kick a user from a group or a supergroup. Returns True on success.
	*
	* In the case of supergroups, the user will not be able to return to the group on their own using invite links, etc., unless unbanned first.
	* The bot must be an administrator in the group for this to work.
	*
	* @link https://core.telegram.org/bots/api#kickchatmember
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function kickChatMember(array $data)
	{
	return self::send('kickChatMember', $data);
	}

	/**
	* Use this method for your bot to leave a group, supergroup or channel. Returns True on success.
	*
	* @link https://core.telegram.org/bots/api#leavechat
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function leaveChat(array $data)
	{
	return self::send('leaveChat', $data);
	}

	/**
	* Use this method to unban a previously kicked user in a supergroup. Returns True on success.
	*
	* The user will not return to the group automatically, but will be able to join via link, etc.
	* The bot must be an administrator in the group for this to work.
	*
	* @link https://core.telegram.org/bots/api#unbanchatmember
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function unbanChatMember(array $data)
	{
	return self::send('unbanChatMember', $data);
	}

	/**
	* Use this method to get up to date information about the chat (current name of the user for one-on-one conversations, current username of a user, group or channel, etc.). Returns a Chat object on success.
	*
	* @todo add get response in ServerResponse.php?
	*
	* @link https://core.telegram.org/bots/api#getchat
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getChat(array $data)
	{
	return self::send('getChat', $data);
	}

	/**
	* Use this method to get a list of administrators in a chat.
	*
	* On success, returns an Array of ChatMember objects that contains information about all chat administrators except other bots.
	* If the chat is a group or a supergroup and no administrators were appointed, only the creator will be returned.
	*
	* @todo add get response in ServerResponse.php?
	*
	* @link https://core.telegram.org/bots/api#getchatadministrators
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getChatAdministrators(array $data)
	{
	return self::send('getChatAdministrators', $data);
	}

	/**
	* Use this method to get the number of members in a chat. Returns Int on success.
	*
	* @todo add get response in ServerResponse.php?
	*
	* @link https://core.telegram.org/bots/api#getchatmemberscount
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getChatMembersCount(array $data)
	{
	return self::send('getChatMembersCount', $data);
	}

	/**
	* Use this method to get information about a member of a chat. Returns a ChatMember object on success.
	*
	* @todo add get response in ServerResponse.php?
	*
	* @link https://core.telegram.org/bots/api#getchatmember
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getChatMember(array $data)
	{
	return self::send('getChatMember', $data);
	}

	/**
	* Use this method to send answers to callback queries sent from inline keyboards. On success, True is returned.
	*
	* The answer will be displayed to the user as a notification at the top of the chat screen or as an alert.
	*
	* @link https://core.telegram.org/bots/api#answercallbackquery
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function answerCallbackQuery(array $data)
	{
	return self::send('answerCallbackQuery', $data);
	}

	/**
	* Get updates
	*
	* @link https://core.telegram.org/bots/api#getupdates
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getUpdates(array $data)
	{
	return self::send('getUpdates', $data);
	}

	/**
	* Set webhook
	*
	* @link https://core.telegram.org/bots/api#setwebhook
	*
	* @param string $url
	* @param array $data Optional parameters.
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function setWebhook($url = '', array $data = [])
	{
	$data = array_intersect_key($data, array_flip([
	'certificate',
	'max_connections',
	'allowed_updates',
	]));
	$data['url'] = $url;

	if (isset($data['certificate'])) {
	self::assignEncodedFile($data, 'certificate', $data['certificate']);
	}

	return self::send('setWebhook', $data);
	}

	/**
	* Delete webhook
	*
	* @link https://core.telegram.org/bots/api#deletewebhook
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function deleteWebhook()
	{
	// Must send some arbitrary data for this to work for now...
	return self::send('deleteWebhook', ['delete']);
	}

	/**
	* Use this method to edit text and game messages sent by the bot or via the bot (for inline bots).
	*
	* On success, if edited message is sent by the bot, the edited Message is returned, otherwise True is returned.
	*
	* @link https://core.telegram.org/bots/api#editmessagetext
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function editMessageText(array $data)
	{
	return self::send('editMessageText', $data);
	}

	/**
	* Use this method to edit captions of messages sent by the bot or via the bot (for inline bots).
	*
	* On success, if edited message is sent by the bot, the edited Message is returned, otherwise True is returned.
	*
	* @link https://core.telegram.org/bots/api#editmessagecaption
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function editMessageCaption(array $data)
	{
	return self::send('editMessageCaption', $data);
	}

	/**
	* Use this method to edit only the reply markup of messages sent by the bot or via the bot (for inline bots).
	*
	* On success, if edited message is sent by the bot, the edited Message is returned, otherwise True is returned.
	*
	* @link https://core.telegram.org/bots/api#editmessagereplymarkup
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function editMessageReplyMarkup(array $data)
	{
	return self::send('editMessageReplyMarkup', $data);
	}

	/**
	* Use this method to send answers to an inline query. On success, True is returned.
	*
	* No more than 50 results per query are allowed.
	*
	* @link https://core.telegram.org/bots/api#answerinlinequery
	*
	* @param array $data
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function answerInlineQuery(array $data)
	{
	return self::send('answerInlineQuery', $data);
	}

	/**
	* Return an empty Server Response
	*
	* No request to telegram are sent, this function is used in commands that
	* don't need to fire a message after execution
	*
	* @return \Longman\TelegramBot\Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function emptyResponse()
	{
	return new ServerResponse(['ok' => true, 'result' => true], null);
	}

	/**
	* Send message to all active chats
	*
	* @param string $callback_function
	* @param array $data
	* @param boolean $send_groups
	* @param boolean $send_super_groups
	* @param boolean $send_users
	* @param string $date_from
	* @param string $date_to
	*
	* @return array
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function sendToActiveChats(
	$callback_function,
	array $data,
	$send_groups = true,
	$send_super_groups = true,
	$send_users = true,
	$date_from = null,
	$date_to = null
	) {
	$callback_path = __NAMESPACE__ . '\Request';
	if (!method_exists($callback_path, $callback_function)) {
	throw new TelegramException('Method "' . $callback_function . '" not found in class Request.');
	}

	$chats = DB::selectChats($send_groups, $send_super_groups, $send_users, $date_from, $date_to);

	$results = [];
	if (is_array($chats)) {
	foreach ($chats as $row) {
	$data['chat_id'] = $row['chat_id'];
	$results[] = call_user_func_array($callback_path . '::' . $callback_function, [$data]);
	}
	}

	return $results;
	}

	/**
	* Use this method to get current webhook status.
	*
	* @link https://core.telegram.org/bots/api#getwebhookinfo
	*
	* @return Entities\ServerResponse
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function getWebhookInfo()
	{
	// Must send some arbitrary data for this to work for now...
	return self::send('getWebhookInfo', ['info']);
	}

	/**
	* Enable request limiter
	*
	* @param boolean $value
	* @param array $options
	*
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	public static function setLimiter($value = true, array $options = [])
	{
	if (DB::isDbConnected()) {
	$options_default = [
	'interval' => 1,
	];

	$options = array_merge($options_default, $options);

	if (!is_numeric($options['interval']) \|\| $options['interval'] <= 0) {
	throw new TelegramException('Interval must be a number and must be greater than zero!');
	}

	self::$limiter_interval = $options['interval'];
	self::$limiter_enabled = $value;
	}
	}

	/**
	* This functions delays API requests to prevent reaching Telegram API limits
	* Can be disabled while in execution by 'Request::setLimiter(false)'
	*
	* @link https://core.telegram.org/bots/faq#my-bot-is-hitting-limits-how-do-i-avoid-this
	*
	* @param string $action
	* @param array $data
	*
	* @throws \Longman\TelegramBot\Exception\TelegramException
	*/
	private static function limitTelegramRequests($action, array $data = [])
	{
	if (self::$limiter_enabled) {
	$limited_methods = [
	'sendMessage',
	'forwardMessage',
	'sendPhoto',
	'sendAudio',
	'sendDocument',
	'sendSticker',
	'sendVideo',
	'sendVoice',
	'sendLocation',
	'sendVenue',
	'sendContact',
	'editMessageText',
	'editMessageCaption',
	'editMessageReplyMarkup',
	];

	$chat_id = isset($data['chat_id']) ? $data['chat_id'] : null;
	$inline_message_id = isset($data['inline_message_id']) ? $data['inline_message_id'] : null;

	if (($chat_id \|\| $inline_message_id) && in_array($action, $limited_methods)) {
	$timeout = 60;

	while (true) {
	if ($timeout <= 0) {
	throw new TelegramException('Timed out while waiting for a request spot!');
	}

	$requests = DB::getTelegramRequestCount($chat_id, $inline_message_id);

	if ($requests['LIMIT_PER_SEC'] == 0 // No more than one message per second inside a particular chat
	&& ((($chat_id > 0 \|\| $inline_message_id) && $requests['LIMIT_PER_SEC_ALL'] < 30) // No more than 30 messages per second globally
	\|\| ($chat_id < 0 && $requests['LIMIT_PER_MINUTE'] < 20)) // No more than 20 messages per minute in groups and channels
	) {
	break;
	}

	$timeout--;
	usleep(self::$limiter_interval * 1000000);
	}

	DB::insertTelegramRequest($action, $data);
	}
	}
	}
	}

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