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efrain |
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<?php
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namespace Aws\CloudFront;
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/**
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* @internal
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*/
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class Signer
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{
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private $keyPairId;
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private $pkHandle;
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/**
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* A signer for creating the signature values used in CloudFront signed URLs
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* and signed cookies.
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*
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* @param $keyPairId string ID of the key pair
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* @param $privateKey string Path to the private key used for signing
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* @param $passphrase string Passphrase to private key file, if one exists
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*
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* @throws \RuntimeException if the openssl extension is missing
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* @throws \InvalidArgumentException if the private key cannot be found.
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*/
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public function __construct($keyPairId, $privateKey, $passphrase = "")
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{
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if (!extension_loaded('openssl')) {
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//@codeCoverageIgnoreStart
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throw new \RuntimeException('The openssl extension is required to '
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. 'sign CloudFront urls.');
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//@codeCoverageIgnoreEnd
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}
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$this->keyPairId = $keyPairId;
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if (!$this->pkHandle = openssl_pkey_get_private($privateKey, $passphrase)) {
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if (!file_exists($privateKey)) {
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throw new \InvalidArgumentException("PK file not found: $privateKey");
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}
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$this->pkHandle = openssl_pkey_get_private("file://$privateKey", $passphrase);
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if (!$this->pkHandle) {
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$errorMessages = [];
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while(($newMessage = openssl_error_string()) !== false){
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$errorMessages[] = $newMessage;
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}
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throw new \InvalidArgumentException(implode("\n",$errorMessages));
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}
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}
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}
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public function __destruct()
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{
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if (PHP_MAJOR_VERSION < 8) {
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$this->pkHandle && openssl_pkey_free($this->pkHandle);
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}
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}
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/**
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* Create the values used to construct signed URLs and cookies.
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*
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* @param string $resource The CloudFront resource to which
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* this signature will grant access.
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* Not used when a custom policy is
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* provided.
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* @param string|integer|null $expires UTC Unix timestamp used when
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* signing with a canned policy.
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* Not required when passing a
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* custom $policy.
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* @param string $policy JSON policy. Use this option when
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* creating a signature for a custom
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* policy.
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*
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* @return array The values needed to construct a signed URL or cookie
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* @throws \InvalidArgumentException when not provided either a policy or a
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* resource and a expires
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*
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* @link http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/private-content-signed-cookies.html
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*/
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public function getSignature($resource = null, $expires = null, $policy = null)
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{
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$signatureHash = [];
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if ($policy) {
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$policy = preg_replace('/\s/s', '', $policy);
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$signatureHash['Policy'] = $this->encode($policy);
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} elseif ($resource && $expires) {
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$expires = (int) $expires; // Handle epoch passed as string
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$policy = $this->createCannedPolicy($resource, $expires);
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$signatureHash['Expires'] = $expires;
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} else {
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throw new \InvalidArgumentException('Either a policy or a resource'
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. ' and an expiration time must be provided.');
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}
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$signatureHash['Signature'] = $this->encode($this->sign($policy));
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$signatureHash['Key-Pair-Id'] = $this->keyPairId;
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return $signatureHash;
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}
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private function createCannedPolicy($resource, $expiration)
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{
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return json_encode([
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'Statement' => [
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[
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'Resource' => $resource,
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'Condition' => [
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'DateLessThan' => ['AWS:EpochTime' => $expiration],
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],
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],
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],
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], JSON_UNESCAPED_SLASHES);
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}
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private function sign($policy)
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{
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$signature = '';
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openssl_sign($policy, $signature, $this->pkHandle);
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return $signature;
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}
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private function encode($policy)
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{
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return strtr(base64_encode($policy), '+=/', '-_~');
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}
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}
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