basic sdk for exmail.qq.com

Exmail.php

<?php

class Exmail
{
    protected $token = null;

    public function __construct($corpId, $corpSecret, $debug = false)
    {
        $url = sprintf('https://api.exmail.qq.com/cgi-bin/gettoken?corpid=%s&corpsecret=%s', $corpId, $corpSecret);
        $resp = self::getJson($url);
        $this->token = $resp['access_token'];

        if ($debug) {
            $this->debug();
        }
    }

    public function getUser($userid)
    {
        $url = sprintf('https://api.exmail.qq.com/cgi-bin/user/get?access_token=%s&userid=%s', $this->token, $userid);
        return self::getJson($url);
    }

    public function createUser($user_info)
    {
        $url = sprintf('https://api.exmail.qq.com/cgi-bin/user/create?access_token=%s', $this->token);
        $resp = self::postJson($url, $user_info);
        return $resp;
    }

    public function deleteUser($userid)
    {
        $url = sprintf('https://api.exmail.qq.com/cgi-bin/user/delete?access_token=%s&userid=%s', $this->token, $userid);
        $resp = self::getJson($url);
        return $resp;
    }

    public static function getJson($url)
    {
        return json_decode(file_get_contents($url), true);
    }

    public static function postJson($url, $data)
    {
        $json = json_encode($data);
        $c = curl_init();
        curl_setopt($c, CURLOPT_URL, $url);
        curl_setopt($c, CURLOPT_POST, 1);
        curl_setopt($c, CURLOPT_SSL_VERIFYPEER, 1);
        curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($c, CURLOPT_POSTFIELDS, $json);
        curl_setopt($c, CURLOPT_HTTPHEADER, array("Content-Type: application/json"));
        $resp = curl_exec($c);
        if (curl_errno($c) !== 0) {
            $err = sprintf("curl[%d]%s", curl_errno($c), curl_error($c));
            curl_close($c);
            throw new Exception($err);
        }
        return json_decode($resp, true);
    }

    public function debug()
    {
        echo "token: {$this->token}\n";
    }
}