<?php
/**
 * Created by PhpStorm.
 * User: stanley-king
 * Date: 2018/12/12
 * Time: 11:14 AM
 */

namespace openapi;


class KeyManager
{
    static private $stInstance = null;
    private $mPaths = [];
    private $mKeys = [];

    const JYC_APPID = "JYC_CHANNEL";
    const DHKJ_APPID = "DHKJ_CHANNEL";

    private function __construct()
    {
        $this->mPaths = [];
        $this->mPaths[self::JYC_APPID]  = BASE_ROOT_PATH . '/helper/openapi/keys/jyc_pub.pem';
        $this->mPaths[self::DHKJ_APPID] = BASE_ROOT_PATH . '/helper/openapi/keys/dhkj_pub.pem';
    }

    static public function instance()
    {
        if(self::$stInstance == null) {
            self::$stInstance = new KeyManager();
        }
        return self::$stInstance;
    }

    private function pub_key($appid)
    {
        if(empty($appid)) return false;

        if(!array_key_exists($appid,$this->mKeys))
        {
            if(!array_key_exists($appid,$this->mPaths))
            {
                return false;
            }
            else {
                $key = file_get_contents($this->mPaths[$appid]);
                $pub = openssl_get_publickey($key);
                if($pub === false) return false;

                $this->mKeys[$appid] = $pub;
            }
        }

        return $this->mKeys[$appid];
    }

    public function verify($appid,$body,$signed)
    {
        $pub = $this->pub_key($appid);
        if($pub === false) return false;
        return openssl_verify($body, $signed, $pub) === 1;
    }
}