/usr/share/php/Aws/CloudFront/Signer.php is in php-aws-sdk 3.15.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | <?php
namespace Aws\CloudFront;
/**
* @internal
*/
class Signer
{
private $keyPairId;
private $pk;
/**
* 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");
}
$this->pk = file_get_contents($privateKey);
}
/**
* 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) {
$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->pk);
return $signature;
}
private function encode($policy)
{
return strtr(base64_encode($policy), '+=/', '-_~');
}
}
|