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<?php
namespace Aws\CloudFront;
/**
* @internal
*/
class Signer
{
private $keyPairId;
private $pkHandle;
/**
* A signer for creating the signature values used in CloudFront signed URLs
* and signed cookies.
*
* @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)
{
if (!extension_loaded('openssl')) {
//@codeCoverageIgnoreStart
throw new \RuntimeException('The openssl extension is required to '
. 'sign CloudFront urls.');
//@codeCoverageIgnoreEnd
}
$this->keyPairId = $keyPairId;
if (!file_exists($privateKey)) {
throw new \InvalidArgumentException("PK file not found: $privateKey");
}
$this->pkHandle = openssl_pkey_get_private("file://$privateKey");
if (!$this->pkHandle) {
throw new \InvalidArgumentException(openssl_error_string());
}
}
public function __destruct()
{
$this->pkHandle && openssl_pkey_free($this->pkHandle);
}
/**
* Create the values used to construct signed URLs and cookies.
*
* @param string $resource The CloudFront resource to which
* this signature will grant access.
* Not used when a custom policy is
* provided.
* @param string|integer|null $expires UTC Unix timestamp used when
* signing with a canned policy.
* Not required when passing a
* custom $policy.
* @param string $policy JSON policy. Use this option when
* creating a signature for a custom
* policy.
*
* @return array The values needed to construct a signed URL or cookie
* @throws \InvalidArgumentException when not provided either a policy or a
* resource and a expires
*
* @link http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-cookies.html
*/
public function getSignature($resource = null, $expires = null, $policy = null)
{
$signatureHash = [];
if ($policy) {
$policy = preg_replace('/\s/s', '', $policy);
$signatureHash['Policy'] = $this->encode($policy);
} elseif ($resource && $expires) {
$expires = (int) $expires; // Handle epoch passed as string
$policy = $this->createCannedPolicy($resource, $expires);
$signatureHash['Expires'] = $expires;
} else {
throw new \InvalidArgumentException('Either a policy or a resource'
. ' and an expiration time must be provided.');
}
$signatureHash['Signature'] = $this->encode($this->sign($policy));
$signatureHash['Key-Pair-Id'] = $this->keyPairId;
return $signatureHash;
}
private function createCannedPolicy($resource, $expiration)
{
return json_encode([
'Statement' => [
[
'Resource' => $resource,
'Condition' => [
'DateLessThan' => ['AWS:EpochTime' => $expiration],
],
],
],
], JSON_UNESCAPED_SLASHES);
}
private function sign($policy)
{
$signature = '';
openssl_sign($policy, $signature, $this->pkHandle);
return $signature;
}
private function encode($policy)
{
return strtr(base64_encode($policy), '+=/', '-_~');
}
}