<?PHP
/**
 * 微信接口公共函数类
 */
 
 
/**
 * 普通模式 获取access_token
 */
function get_access_token($appid,$secret){
    $url  = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$appid."&secret=".$secret;
    $data = https_request($url);
    if($data){
        $result = json_decode($data, true);// 默认false，为Object，若是True，为Array
        return $result['access_token'];
    }else{
        return false;
    }
}

//获取微信的access_token
/*
 * 返回：
 * ＄return = array(
 *  'access_token'=>'token值',
 *  'expires_in'=>'有效时间(秒)',
 *  't'=>'有效时间'
 * );
 */
function get_access_token2(){

    $f = new zdeFile();
    $info = $f->readAll(WEBPATH_DIR."cache/access_token.php");
    if($info){//如果有读到数据，而且数据还有效，则直接返回
        $info = json_decode($info,true);
        if(isset($info['t']) && $info['t']>time()-60){
            return $info;
        }
    }
    //获取token url
    $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$GLOBALS["appid"]."&secret=".$GLOBALS["secret"];
    //发送http请求得到json流
    $res = https_request($url);
    $req_data = json_decode($res, true);
    if(!empty($req_data['access_token'])){
        $req_data['t'] = time() + $req_data['expires_in'];
        //保存数据
        $f->write(WEBPATH_DIR."cache/access_token.php",json_encode($req_data),false);
        return $req_data;
    }else{
        return false;
    }
}


/**
 * 授权模式 获取的token
 */
function get_sns_token($appid,$secret,$code){
    $url 	= 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$secret.'&code='.$code.'&grant_type=authorization_code';
    //sys_log_write_content( $url ,"error_log","url_error");
    $result = https_request($url);
    if($result){
        //sys_log_write_content( 'OPENID成功'.$result.__FILE__.__LINE__ ,"error_log","openid_ok");
        $json_obj = json_decode($result,true);
        return $json_obj;
    }else{
        sys_log_write_content( 'OPENID出错'.$result.__FILE__.__LINE__ ,"error_log","openid_error");
        return false;
    }

}

/**
 * 获取已关注公众号的全部用户的openid
 */
function get_user_sub($token){
    $data = https_request("https://api.weixin.qq.com/cgi-bin/user/get?access_token=$token");
    if($data){
        $result = json_decode($data, true);// 默认false，为Object，若是True，为Array
        foreach( $result['data']['openid'] as $k=>$v) {
            $user_sub[] = $v;
        }
        return $user_sub;
    }else{
        return false;
    }
}

/**
 * 获取已关注公众号的用户信息
 */
function get_sub_user($token,$openid){
    $url  = "https://api.weixin.qq.com/cgi-bin/user/info?access_token=".$token."&openid=".$openid;
    $data = https_request($url);
    if($data){
        $result = json_decode($data, true);// 默认false，为Object，若是True，为Array
        return $result;
    }else{
        return false;
    }
}

/**
 * 获取授权登录的用户信息
 */
function get_sns_user($token,$openid){
    $url   = 'https://api.weixin.qq.com/sns/userinfo?access_token='.$token.'&openid='.$openid;
    $data  = https_request($url);
    if($data){
        sys_log_write_content( 'get_sns_user成功'.$data.__FILE__.__LINE__ ,"error_log","get_sns_user_ok");
        $result = json_decode($data, true);// 默认false，为Object，若是True，为Array
        return $result;
    }else{
        sys_log_write_content( 'get_sns_user出错'.$data.__FILE__.__LINE__ ,"error_log","get_sns_user_error");
        return false;
    }
}

/**
 * 是否已关注了公众号
 */
function is_att_wx($appid,$secret,$openid){
	$access_token = get_access_token($appid,$secret);
	if(!$access_token){
		return false;
	}
	$url    = 'https://api.weixin.qq.com/cgi-bin/user/info?access_token='.$access_token.'&openid='.$openid;
	$result = https_request($url);
	$data   = json_decode($result,true); 
	if($data){
		return $data;
		//$data["subscribe"] = $data['subscribe']==0?0:1;
	}else{
		return false;
	}
}


/**
 * 获取米大师 sig 签名
 */
function get_offer_sig($obj,$secret,$key,$url){
	foreach ($obj as $k => $v){
		$arr[$k] = $v;
	}
	ksort($arr);
	$string = format_biz_query_para_map($arr, false);
	$string_sign = $string.'&org_loc='.$url.'&method=POST&secret='.$secret;
	return $sig = hash_hmac('sha256',$string_sign,$key);//HMAC-SHA256签名
}

/**
 * 获取米大师 mp_sig 签名
 */
function get_offer_mp_sig($obj,$session_key,$key,$url){
	foreach ($obj as $k => $v){
		$arr[$k] = $v;
	}
	ksort($arr);
	$string = format_biz_query_para_map($arr, false);
	$string_sign = $string.'&org_loc='.$url.'&method=POST&session_key='.$session_key;
	return $sig = hash_hmac('sha256',$string_sign,$key);//HMAC-SHA256签名
}

/**
 * 作用：格式化参数，签名过程需要使用
 */
function format_biz_query_para_map($paraMap, $urlencode){
	$buff = "";
	ksort($paraMap);
	foreach ($paraMap as $k => $v){
		if($urlencode){
		   $v = urlencode($v);
		}
		//$buff .= strtolower($k) . "=" . $v . "&";
		$buff .= $k . "=" . $v . "&";
	}
	$reqPar;
	if (strlen($buff) > 0) {
		$reqPar = substr($buff, 0, strlen($buff)-1);
	}
	return $reqPar;
}


/**
 * 检验数据的真实性，并且获取解密后的明文.
 * @param $encryptedData string 加密的用户数据
 * @param $iv string 与用户数据一同返回的初始向量
 * @param $sessionKey string 用户登陆后从微信返回的session_key
 *
 * @return 解密后的数据
 */
function wx_decryptData( $encryptedData, $iv,$sessionKey){
    if (strlen($sessionKey) != 24) {
        return false;
    }
    $aesKey=base64_decode($sessionKey);

    if (strlen($iv) != 24) {
        return false;
    }
    $aesIV=base64_decode($iv);
    $aesCipher=base64_decode($encryptedData);
    $result= openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
    $dataObj=json_decode($result,true);
    if( empty($dataObj) ){
        return false;
    }
    if( $dataObj['watermark']['appid'] != $GLOBALS["appid"] ) {
        return false;
    }
    return $dataObj;
}