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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), '+=/', '-_~'); } }
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