PHP阿里云云解析签名, 通过API 绑定域名到动态 ip

<?php
date_default_timezone_set("GMT");

//绑定 ip 到域名
Ali::Obj()->UpdateDomainRecord();

class Ali
{
private $accessKeyId  = "OJR9w5xfGaz1jVDg";
private $accessSecrec = "xOKRdKk0EI7F0hdtnEnIAVLVxAe4LI";
private static $obj  = null;
public static function Obj ()
{
if(is_null(self::$obj))
{
self::$obj = new self();
}
return self::$obj;
}

public function DescribeDomainRecords()
{
$requestParams = array(
"Action"    =>  "DescribeDomainRecords",
"DomainName"    =>  "hankangkang.com"
);
$val =  $this->requestAli($requestParams);
$this->outPut($val);
}

/**
* 更新 ip
*/
public function UpdateDomainRecord()
{
$ip = $this->ip();
$requestParams = array(
"Action"        =>  "UpdateDomainRecord",
"RecordId"      =>  "71927383",
"RR"            =>  "@",
"Type"          =>  "A",
"Value"         =>  $ip,
);
$val =  $this->requestAli($requestParams);
$this->outPut($val."  ".$ip);
}

private function requestAli($requestParams)
{
$publicParams = array(
"Format"        =>  "JSON",
"Version"       =>  "2015-01-09",
"AccessKeyId"   =>  $this->accessKeyId,
"Timestamp"     =>  date("Y-m-d\TH:i:s\Z"),
"SignatureMethod"   =>  "HMAC-SHA1",
"SignatureVersion"  =>  "1.0",
"SignatureNonce"    =>  substr(md5(rand(1,99999999)),rand(1,9),14),
);

$params = array_merge($publicParams, $requestParams);
$params['Signature'] =  $this->sign($params, $this->accessSecrec);
$uri = http_build_query($params);
$url = 'http://alidns.aliyuncs.com/?'.$uri;
return $this->curl($url);
}

private function ip()
{
$ip = $this->curl("http://httpbin.org/ip");
$ip = json_decode($ip,true);
return $ip['origin'];
}

private function sign($params, $accessSecrec, $method="GET")
{
ksort($params);
$stringToSign = strtoupper($method).'&'.$this->percentEncode('/').'&';

$tmp = "";
foreach($params as $key=>$val){
$tmp .= '&'.$this->percentEncode($key).'='.$this->percentEncode($val);
}
$tmp = trim($tmp, '&');
$stringToSign = $stringToSign.$this->percentEncode($tmp);

$key  = $accessSecrec.'&';
$hmac = hash_hmac("sha1", $stringToSign, $key, true);

return base64_encode($hmac);
}

private function percentEncode($value=null)
{
$en = urlencode($value);
$en = str_replace("+", "%20", $en);
$en = str_replace("*", "%2A", $en);
$en = str_replace("%7E", "~", $en);
return $en;
}

private function curl($url)
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url );
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 );
$result=curl_exec ($ch);
return $result;
}

private function outPut($msg)
{
echo date("Y-m-d H:i:s")."  ".$msg.PHP_EOL;
}
}