<?php namespace App\Servers\Encrypts;

use Firebase\JWT\JWT;
use Firebase\JWT\Key;

/**
 * 登录令牌
 *
 * @author    刘相欣
 */
class AccessToken
{
	protected			$config;

	public function __construct()
	{
		// 过期时间
		$expire				= (int) config('login_expire_day',7);
		// 默认时间
		$expire				= $expire ? $expire : 7;
		// 配置
		$this->config		= [
								// 'iss'            	 => '',
								'alg'             	=> 'HS256',
								'key'             	=> config('PWD_KEY','123456789@abcdedfghlk'),
								'expire_interval' 	=> $expire * 24 * 60 * 60,
								'login_expire_day' 	=> $expire,
							];
	}

	/**
	 * 加密数据
	 * 
	 */
	public function encode( array $data )
	{
		return JWT::encode( $data, $this->config['key'], $this->config['alg'] );
	}

	/**
	 * 解密数据
	 * 
	 */
	public function decode( string $access_token )
	{
		try{
			$access_token_data = (array) JWT::decode( $access_token, new Key($this->config['key'],$this->config['alg']));
		} catch( \Firebase\JWT\ExpiredException $e ){
			return ['error'=>$e->getMessage()];
		} catch( \Firebase\JWT\SignatureInvalidException $e ){
			return ['error'=>$e->getMessage()];
		} catch( \Exception $e ){
			return ['error'=>$e->getMessage()];
		}
		return				$access_token_data;
	}

	/**
	 * 生成权限令牌
	 * 
	 * 
	 */
	public function createAccessToken( int $user_id, int $start_time = 0 )
	{
		// 组合数据
		$encodeData		= [
							'jti' => $start_time,
							// 'iss' => '',
							'sub' => $user_id,
							'iat' => $start_time,
							'exp' => $start_time + $this->config['expire_interval'],
						];
		// 生成权限令牌
		$access_token	= $this->encode( $encodeData );
		// 返回结果
		return 			[
							'access_token'	=> $access_token,
							'expires_in'	=> $encodeData['exp'],
						];
	}
}