Php 如何在AWS cloudfront中组合流名称?
Amazon Cloudfront SDK和示例代码-如何组合流名称?所有其他函数都有详细说明,但我看不到create\u stream\u name()的任何定义或示例 下面是文档中描述的示例的完整代码: 如您所见,函数create_stream_name()不会出现在任何位置,而是在第12行中调用,这将导致“调用未定义函数”错误。我应该如何定义create_stream_name()Php 如何在AWS cloudfront中组合流名称?,php,amazon-web-services,sdk,amazon-cloudfront,Php,Amazon Web Services,Sdk,Amazon Cloudfront,Amazon Cloudfront SDK和示例代码-如何组合流名称?所有其他函数都有详细说明,但我看不到create\u stream\u name()的任何定义或示例 下面是文档中描述的示例的完整代码: 如您所见,函数create_stream_name()不会出现在任何位置,而是在第12行中调用,这将导致“调用未定义函数”错误。我应该如何定义create_stream_name() 函数create\u stream\u name()在完整示例(demo.php)中定义,您可以从下载。完整
函数
create\u stream\u name()
在完整示例(demo.php)中定义,您可以从下载。完整的示例链接到文档页面顶部的,尽管文本“PHP中视频流的签名代码”后面有些模糊。[更新:不再模糊,请参见下文。]
完全披露:我是该文档页面的负责人,因此我将做几件事使其更好:
- 使指向完整样本的链接更容易发现。[更新:完整示例的下载URL现在在顶部更加突出。]
- 将完整示例添加到页面中,这样您就可以直接在页面上查看和复制它,而无需下载zip文件。[更新:现在是完整的示例。]
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);
}