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<?php
namespace LINE\LINEBot\Event\Parser;
use LINE\LINEBot\Event\MessageEvent;
use LINE\LINEBot\Event\MessageEvent\UnknownMessage;
use LINE\LINEBot\Event\UnknownEvent;
use LINE\LINEBot\Exception\InvalidEventRequestException;
use LINE\LINEBot\Exception\InvalidSignatureException;
use LINE\LINEBot\SignatureValidator;
class EventRequestParser
{
private static $eventType2class = [
'message' => 'LINE\LINEBot\Event\MessageEvent',
'follow' => 'LINE\LINEBot\Event\FollowEvent',
'unfollow' => 'LINE\LINEBot\Event\UnfollowEvent',
'join' => 'LINE\LINEBot\Event\JoinEvent',
'leave' => 'LINE\LINEBot\Event\LeaveEvent',
'postback' => 'LINE\LINEBot\Event\PostbackEvent',
'beacon' => 'LINE\LINEBot\Event\BeaconDetectionEvent',
];
private static $messageType2class = [
'text' => 'LINE\LINEBot\Event\MessageEvent\TextMessage',
'image' => 'LINE\LINEBot\Event\MessageEvent\ImageMessage',
'video' => 'LINE\LINEBot\Event\MessageEvent\VideoMessage',
'audio' => 'LINE\LINEBot\Event\MessageEvent\AudioMessage',
'file' => 'LINE\LINEBot\Event\MessageEvent\FileMessage',
'location' => 'LINE\LINEBot\Event\MessageEvent\LocationMessage',
'sticker' => 'LINE\LINEBot\Event\MessageEvent\StickerMessage',
];
public static function parseEventRequest($body, $channelSecret, $signature)
{
if (!isset($signature)) {
throw new InvalidSignatureException('Request does not contain signature');
}
if (!SignatureValidator::validateSignature($body, $channelSecret, $signature)) {
throw new InvalidSignatureException('Invalid signature has given');
}
$events = [];
$parsedReq = json_decode($body, true);
if (!array_key_exists('events', $parsedReq)) {
throw new InvalidEventRequestException();
}
foreach ($parsedReq['events'] as $eventData) {
$eventType = $eventData['type'];
if (!array_key_exists($eventType, self::$eventType2class)) {
$events[] = new UnknownEvent($eventData);
continue;
}
$eventClass = self::$eventType2class[$eventType];
if ($eventType === 'message') {
$events[] = self::parseMessageEvent($eventData);
continue;
}
$events[] = new $eventClass($eventData);
}
return $events;
}
private static function parseMessageEvent($eventData)
{
$messageType = $eventData['message']['type'];
if (!array_key_exists($messageType, self::$messageType2class)) {
return new UnknownMessage($eventData);
}
$messageClass = self::$messageType2class[$messageType];
return new $messageClass($eventData);
}
}