
<?php
/**
 * 微信支付服务器端下单
 * 微信APP支付文档地址:  https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_6
 * 使用示例
 *  构造方法参数
 *      'appid'     =>  //填写微信分配的公众账号ID
 *      'mch_id'    =>  //填写微信支付分配的商户号
 *      'notify_url'=>  //填写微信支付结果回调地址
 *      'key'       =>  //填写微信商户支付密钥
 *  );
 *  统一下单方法
 *  $WechatAppPay = new wechatAppPay($options);
 *  $params['body'] = '商品描述';                   //商品描述
 *  $params['out_trade_no'] = '1217752501201407';   //自定义的订单号，不能重复
 *  $params['total_fee'] = '100';                   //订单金额 只能为整数 单位为分
 *  $params['trade_type'] = 'APP';                  //交易类型 JSAPI | NATIVE |APP | WAP
 *  $wechatAppPay->unifiedOrder( $params );
 */
class weixin_public
{

    private $appid;
    private $seceret;
    private $uri;

    public function __construct($appid, $seceret, $uri)
    {
        $this->appid = $appid;
        $this->seceret = $seceret;
        $this->uri = $uri;
    }

    //获取code
    public function redirectWithCode()
    {
        $url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$this->appid
            ."&redirect_uri=".urlencode($this->uri)
            ."&response_type=code&scope=snsapi_userinfo&state=".time()."#wechat_redirect";

        return $url;
    }

    private function getAcessTokenAndOpenId($code)
    {
        $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$this->appid
            ."&secret=".$this->seceret."&code=".$code."&grant_type=authorization_code";

        $jsonInfo = file_get_contents($url);
        return json_decode($jsonInfo, true); //接受一个 JSON 格式的字符串并且把它转换为 PHP 变量
    }

    private function getBaseToken()
    {
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appid."&secret=".$this->seceret;

        $jsonInfo = file_get_contents($url);
        return json_decode($jsonInfo, true);
    }

    private function getJsTicket($access_token)
    {
        $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=".$access_token."&type=jsapi"; // 两小时有效

        $jsonInfo = file_get_contents($url);
        return json_decode($jsonInfo,true);
    }

    private function createNonceStr($length = 16) {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    private function getSignPackage($jsToken, $jsUrl) {
        // 注意 URL 一定要动态获取，不能 hardcode.
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        //$jsUrl = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
        //$jsUrl = "$protocol$_SERVER[HTTP_HOST]/front-page/fission-page.html";

        $nonceStr = self::createNonceStr();
        $timestamp = time();
        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsToken&noncestr=$nonceStr&timestamp=$timestamp&url=$jsUrl";

        $signature = sha1($string);

        $signPackage = array(
            "appId"     => $this->appid,
            "nonceStr"  => $nonceStr,
            "timestamp" => $timestamp,
            "url"       => $jsUrl,
            "signature" => $signature,
            "rawString" => $string
        );

        return $signPackage;
    }

    public function getAllInfo($code, $jsUrl)
    {
        $reader = array();

        $info = self::getAcessTokenAndOpenId($code);
        if (empty($info['access_token']) || empty($info['openid'])) {
            return $reader;
        }

        $baseTokenInfo = self::getBaseToken();
        if (empty($baseTokenInfo['access_token'])) {
            return $baseTokenInfo;
        }

        $url = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=".$baseTokenInfo['access_token']."&openid=".$info['openid']."&lang=zh_CN";
        $jsonInfo = file_get_contents($url);
        //$jsonInfo = iconv('ISO-8859-1', 'UTF-8', $jsonInfo);
        $rs = json_decode($jsonInfo, true); //接受一个 JSON 格式的字符串并且把它转换为 PHP 变量

        if(empty($rs['openid'])) {
            return $rs;
        }

        $attr['country']    = $rs['country'];
        $attr['province']   = $rs['province'];
        $attr['city']       = $rs['city'];
        $attr['headimgurl'] = $rs['headimgurl'];
        $attr['openid']     = $rs['openid'];
        $attr['nickname']   = $rs['nickname'];
        $attr['sex']        = $rs['sex'];
        $attr['subscribe']      = $rs['subscribe'];
        $attr['subscribe_time'] = $rs['subscribe_time'];
        $reader = Reader::getInfoByOpenId($info['openid']);
        Reader::addOrUpdate($reader['id'], $attr);
        $reader = Reader::getInfoByOpenId($info['openid']);

        $jsTokenInfo = self::getJsTicket($baseTokenInfo['access_token']);
        if (empty($jsTokenInfo['ticket'])) {
            return $jsTokenInfo;
        }

        $signPackage = self::getSignPackage($jsTokenInfo['ticket'], $jsUrl);
        $reader['js_sign'] = $signPackage;

        return $reader;
    }


}