cloudfront签名的网址

Question

我在Cloudfront上签名的URL在PHP中运行良好.存储桶策略与S3上的HTTP引用一起使用,但由于Cloudfront不支持HTTP引用来检查,我需要仅将文件提供给一个IP地址(请求该文件并生成签名URL的客户端或理想的Web服务器).

有人可以帮我将IP地址元素添加到JSON代码中,以便它可以工作吗？

"IpAddress":{"AWS:SourceIp":"192.0.2.0/24"},

我迷失了PHP和政策声明,但认为对于知道的人来说可能很容易:http://tinyurl.com/9czr5lp

它对自定义策略的编码/签名略有不同:http://docs.amazonwebservices.com/AmazonCloudFront/latest/DeveloperGuide/private-content-creating-signed-url-custom-policy.html#private-content-custom -政策声明

以下是AWS示例,除了IP地址锁定外,其他方法都有效.

如果有人可以请你帮我两分钟,我可以很快测试一下!

非常感谢MASSIVELY的任何帮助:)

乔恩

    function getSignedURL($resource, $timeout)
    {
        $keyPairId = "XXXXXXXXXXXX";
        $expires = time() + $timeout;
        $json = '{"Statement":[{"Resource":"'.$resource.'","Condition":{"DateLessThan":     {"AWS:EpochTime":'.$expires.'}}}]}';
        $fp=fopen("pk-XXXXXXXX.pem","r");

        $priv_key=fread($fp,8192);
        fclose($fp);

        $key = openssl_get_privatekey($priv_key);
        if(!$key)
        {
                echo "<p>Failed to load private key!</p>";
                return;
        }

        //Sign the policy with the private key

        if(!openssl_sign($json, $signed_policy, $key, OPENSSL_ALGO_SHA1))
        {
                echo '<p>Failed to sign policy: '.openssl_error_string().'</p>';
                return;
        }
        //Create url safe signed policy
        $base64_signed_policy = base64_encode($signed_policy);
        $signature = str_replace(array('+','=','/'), array('-','_','~'), $base64_signed_policy);
        //Construct the URL
        $url = $resource.'?Expires='.$expires.'&Signature='.$signature.'&Key-Pair-Id='.$keyPairId;
        return $url;
}
$url = getSignedURL("http://s675765.cloudfront.net/filename.mp4", 600);
print $url;

Answer 1

{"Statement":[{"Resource":"testRes","Condition":{"DateLessThan":{"AWS:EpochTime":1357034400},"IpAddress":{"AWS:SourceIp":"192.0.2.0\/24"}}}]}

这是一个有效的 JSON 字符串，包含填充值和转义值。如果您将 IP 地址作为变量传递，请确保转义/

例如

$escapedIp = str_replace( '/', '\/', $ipAddress );

看一下 php json 扩展这会让事情变得更容易：

php 数组形式的示例语句

$statement = array( 
    'Statement' => array( 
        array(
            'Resource' => $resource, 
            'Condition' => array( 
                'DateLessThan' => array( 
                    'AWS:EpochTime' => $expires 
                ),
                'IpAddress' => array( 
                    'AWS:SourceIp' => $ipAddress 
                ) 
            ) 
        )
    ) 
);

$json = json_encode( $statement );