如何在AWS Cloudfront中组合流名称?

问题描述 投票:0回答:1

Amazon Cloudfront SDK和示例代码-如何合并流名称?其他所有功能均已阐明,但我看不到create_stream_name()的任何定义或示例。

下面是示例的完整代码,如此处文档所述:https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/CreateURL_PHP.html

如您所见,函数create_stream_name()不会出现在任何地方,而是在第12行中调用,这将导致“调用未定义的函数”错误。我应该如何定义create_stream_name()?

function get_canned_policy_stream_name($video_path, $private_key_filename, $key_pair_id, $expires) {
        // this policy is well known by CloudFront, but you still need to sign it, 
        // since it contains your parameters
        $canned_policy = '{"Statement":[{"Resource":"' . $video_path . '","Condition":{"DateLessThan":{"AWS:EpochTime":'. $expires . '}}}]}';

        // sign the canned policy
        $signature = $this->rsa_sha1_sign($canned_policy, $private_key_filename);
        // make the signature safe to be included in a url
        $encoded_signature = $this->url_safe_base64_encode($signature);

        // combine the above into a stream name
        $stream_name = create_stream_name($video_path, null, $encoded_signature, $key_pair_id, $expires);
        // url-encode the query string characters to work around a flash player bug
    return encode_query_params($stream_name);
}



function rsa_sha1_sign($policy, $private_key_filename) {
    $signature = "";

    // load the private key
    $fp = fopen($private_key_filename, "r");
    $priv_key = fread($fp, 8192);
    fclose($fp);
    $pkeyid = openssl_get_privatekey($priv_key);

    // compute signature
    openssl_sign($policy, $signature, $pkeyid);

    // free the key from memory
    openssl_free_key($pkeyid);

    return $signature;
}

function url_safe_base64_encode($value) {
    $encoded = base64_encode($value);
    // replace unsafe characters +, = and / with 
    // the safe characters -, _ and ~
    return str_replace(
        array('+', '=', '/'),
        array('-', '_', '~'),
        $encoded);
}
php amazon-web-services sdk amazon-cloudfront
1个回答
0
投票

create_stream_name()函数在完整的示例(demo.php)中定义,可以在https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/samples/demo-php.zip下载。完整的示例是从文档页面的顶部链接的,尽管在文本“ PHP中的视频流的签名代码”后面有些模糊。

完全公开:我是该文档页面的负责人,所以我将做几件事以使其变得更好:

  • 使到完整示例的链接更容易发现。
  • 将完整的示例添加到页面,因此您可以直接在页面上查看和复制它,而不必下载zip文件。
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