小程序开发----自定义会员卡卡号和用户领取，以及简单介绍卡券功能和注意事项

　　前一段时间做项目涉及到这方面的内容，看了技术文档，小程序页面没有详细介绍，要前往微信公众号开发文档，卡券功能是先为微信公众号开发的功能，后来也提供个小程序，文档在小程序中没有过多的介绍，微信文档我就不想过多的吐槽了，大家都懂。

一、会员卡

　　1、在小程序会员卡，其实也是用到微信公众号的，开始在摸索，在微信公众号管理后台创建会员卡，在小程序中能调用，但会员卡号不能自定义编号，因为管理后创建的，默认是不能自定义编码（use_custom _code=false），一键开卡（wx_activate=true）、自动激活（auto_activate=true），所以不是我们需要的，应该另辟一条道路，自己通过接口创建会员卡，代码例子如下：

    public function addCard(){
 2         $url = 'https://api.weixin.qq.com/card/create?access_token='.$this->getAccessToken();
        $post['card']['card_type'] = 'MEMBER_CARD';
        $post['card']['member_card']['prerogative'] = '111';
        $post['card']['member_card']['auto_activate'] = true; //自动激活
        $post['card']['member_card']['wx_activate'] = true; //一键开卡
        $post['card']['member_card']['supply_bonus'] = false;
        $post['card']['member_card']['supply_balance'] = false;
        $post['card']['member_card']['base_info']['logo_url'] = "http://mmbiz.qpic.cn/mmbiz_png/xxxxxxxxxxxxxxxxxxx=png"; //会员卡图片路径
        $post['card']['member_card']['base_info']['code_type'] = "CODE_TYPE_TEXT";
        $post['card']['member_card']['base_info']['brand_name'] = 'brand_name_1';
        $post['card']['member_card']['base_info']['title'] = 'title_1';
        $post['card']['member_card']['base_info']['color'] = 'Color010';
        $post['card']['member_card']['base_info']['notice'] = 'notice';
        $post['card']['member_card']['base_info']['description'] = 'description';
        $post['card']['member_card']['base_info']['sku']['quantity'] = 1000000000;
        $post['card']['member_card']['base_info']['date_info']['type'] = 'DATE_TYPE_PERMANENT';
        $post['card']['member_card']['base_info']['get_limit'] = 1; //限领一张
        $post['card']['member_card']['base_info']['can_share'] = false;
        $post['card']['member_card']['base_info']['can_give_friend'] = false;
        $post['card']['member_card']['base_info']['use_custom_code'] = true;  //开启自定义编码
        $data = http_curl_post_json($url,$post);
        $data = json_decode($data,true);
        return $data;
    }

 　　2、创建好会员卡后，在小程序中写入用户领取会员卡的前端代码，jssdk的wx.addCard方法，其中加密不同于jssdk的加密方式，加密方式看微信公众号jssdk说明文档附录4，addCard方法的cardExt里的参数很重要

　　　　code：需要给用户自定义编码时，才需填入你后台开发生成编码（会员卡卡号），否则不填为空字符串

　　　　openid：需要给自定的用户发放会员卡是，才需填入用户的openid（微信公众号的openid而不是小程序的openid），否则为空字符串

　　　　...........等参数

　　　　注意：以上参数需要用到的时候才加入一起加密，如：code的值为空字符串则不需加了加密，否则领取会员卡时会出签名错误

　　　　加密方法如下：

<?php
class Jssdk {

    private $appId = '';
    private $appSecret = '';
    public function __construct($appId,$appSecret){
        $this->appId = $appId;
        $this->appSecret = $appSecret;
    }
    /*
    *实现微信jssdk加密
    */
    public function getSignPackage($url) {
        $jsapiTicket = $this->getJsApiTicket();
        // 注意 URL 一定要动态获取，不能 hardcode. //ajax页面url则必须要前端传输url地址
        // $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        // $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
        $timestamp = time();
        $nonceStr = $this->createNonceStr();

        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

        $signature = sha1($string);

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

    //获取access_token
    public function getAccessTokenInfo(){
        return $this->getAccessToken();
    }

    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 getJsApiTicket() {
        // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode(file_get_contents("xxxx/jsapi_ticket.json")); //xxxx/jsapi_ticket.json 是存放路径
        if ($data->expire_time < time()) {
            $accessToken = $this->getAccessToken();
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            $res = json_decode($this->curl($url));
            $ticket = $res->ticket;
            if ($ticket) {
                $data->expire_time = time() + 7000;
                $data->jsapi_ticket = $ticket;
                $fp = fopen("xxxx/jsapi_ticket.json", "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } else {
            $ticket = $data->jsapi_ticket;
        }
        return $ticket;
    }

    private function getAccessToken() {
        // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode(file_get_contents("xxxx/access_token.json"));
        if ($data->expire_time < time()) {
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode($this->curl($url));
            $access_token = $res->access_token;
            if ($access_token) {
                $data->expire_time = time() + 7000;
                $data->access_token = $access_token;
                $fp = fopen("xxxx/access_token.json", "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } else {
            $access_token = $data->access_token;
        }
        return $access_token;
    }

    private function curl( $url , $postFields = NULL )
    {
        $ch = curl_init();
        curl_setopt( $ch , CURLOPT_TIMEOUT , 3 );
        curl_setopt( $ch , CURLOPT_URL , $url );
        curl_setopt( $ch , CURLOPT_FAILONERROR , FALSE );
        curl_setopt( $ch , CURLOPT_RETURNTRANSFER , TRUE );
        //https 请求
        if ( strlen( $url ) > 5 && strtolower( substr( $url , 0 , 5 ) ) == 'https' ){
            curl_setopt( $ch , CURLOPT_SSL_VERIFYPEER , FALSE );
            curl_setopt( $ch , CURLOPT_SSL_VERIFYHOST , FALSE );
        }
 
        if ( is_array( $postFields ) && 0 < count( $postFields ) ){
            $postBodyString = '';
            $postMultipart  = FALSE;
            foreach ( $postFields as $k => $v ) {
                if ( '@' != substr( $v , 0 , 1 ) ) //判断是不是文件上传
                {
                    $postBodyString .= "$k=" . urlencode( $v ) . "&";
                } else {
                    //文件上传用multipart/form-data，否则用www-form-urlencoded
                    $postMultipart = TRUE;
                }
            }
            $postFields = trim( $postBodyString , '&' );
            unset( $k , $v );
            curl_setopt( $ch , CURLOPT_POST , TRUE );
            if ( $postMultipart ){
                curl_setopt( $ch , CURLOPT_POSTFIELDS , $postFields );
            } else {
                curl_setopt( $ch , CURLOPT_POSTFIELDS , $postFields );
            }
        }
 
        $reponse = curl_exec( $ch );
        curl_close( $ch );
        return $reponse;
    }

    //卡券等签名，
    private function apiTicket() {
        // api_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode(file_get_contents("xxxx/api_ticket.json"));
        if ($data->expires_in < time()) {
            $accessToken = $this->getAccessToken();
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=$accessToken&type=wx_card";
            $res = json_decode($this->curl($url));
            $ticket = $res->ticket;
            if ($ticket) {
                $data->expires_in = time() + 7000;
                $data->ticket = $ticket;
                $fp = fopen("xxxx/api_ticket.json", "w");
                fwrite($fp, json_encode($data));
                fclose($fp);
            }
        } else {
            $ticket = $data->ticket;
        }
        return $ticket;
    }
    //由于历史原因，卡券的JS接口先于JSSDK出现，当时的JSAPI并没有鉴权体系，所以在卡券的签名里也加上了appsecret/api_ticket这些身份信息
    public function getApiTicket($cardId='',$code='') {
        $apiTicket = $this->apiTicket();
        $timestamp = time();
        $nonceStr = $this->createNonceStr();
        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $tmpArr = array($nonceStr,$apiTicket,$cardId,$timestamp);
        if($code){
            array_push($tmpArr, $code);
        }
        sort($tmpArr,SORT_STRING);
        $tmpStr = implode($tmpArr);
        $signature = sha1($tmpStr);
        $signPackage = array(
            "cardId"     => $cardId,
            "nonceStr"  => $nonceStr,
            "timestamp" => $timestamp,
            "signature" => $signature,
        );
        return $signPackage;
    }
}
?>

　　3、领取会员卡，回调给后台领取信息，在addCard方法领取成功会返回用户领取的相关信息，success中把领取的信息提交后台保存，从而确认领取成功。

　　4、很多jssdk功能最先在微信公众号的，之后小程序在这基础之上引用，所以在小程序引用jssdk的方法涉及到的appid和appid密码都是微信公众号的而不是小程序的，卡券也如此，千万不要搞错，否则会造成签名错误等问题，这点微信官网没有说明。

　　5、熟悉会员卡，其它卡券类型也差不多。

以下会运用到的方法： 
 1 //post方式提交json格式的数据
function http_curl_post_json($url,$post){
    $data_string = json_encode($post);
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_POSTFIELDS,$data_string);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'Content-Type: application/json',
        'Content-Length: ' . strlen($data_string))
    );
    $result = curl_exec($ch);
    return $result;        
}

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