<?php
namespace Aws\CloudFront;
class CookieSigner
{
/** @var Signer */
private $signer;
private static $schemes = [
'http' => true,
'https' => true,
];
/**
* @param $keyPairId string ID of the key pair
* @param $privateKey string Path to the private key used for signing
*
* @throws \RuntimeException if the openssl extension is missing
* @throws \InvalidArgumentException if the private key cannot be found.
*/
public function __construct($keyPairId, $privateKey)
{
$this->signer = new Signer($keyPairId, $privateKey);
}
/**
* Create a signed Amazon CloudFront Cookie.
*
* @param string $url URL to sign (can include query string
* and wildcards). Not required
* when passing a custom $policy.
* @param string|integer|null $expires UTC Unix timestamp used when signing
* with a canned policy. Not required
* when passing a custom $policy.
* @param string $policy JSON policy. Use this option when
* creating a signed cookie for a custom
* policy.
*
* @return array The authenticated cookie parameters
* @throws \InvalidArgumentException if the URL provided is invalid
* @link http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-cookies.html
*/
public function getSignedCookie($url = null, $expires = null, $policy = null)
{
if ($url) {
$this->validateUrl($url);
}
$cookieParameters = [];
$signature = $this->signer->getSignature($url, $expires, $policy);
foreach ($signature as $key => $value) {
$cookieParameters["CloudFront-$key"] = $value;
}
return $cookieParameters;
}
private function validateUrl($url)
{
$scheme = str_replace('*', '', explode('://', $url)[0]);
if (empty(self::$schemes[strtolower($scheme)])) {
throw new \InvalidArgumentException('Invalid or missing URI scheme');
}
}
}
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