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1<?php
2declare(strict_types=1);
3/**
4 * DPoP nonce storage using WordPress transients.
5 *
6 * @package Wireservice
7 */
8
9namespace Wireservice;
10
11if (! defined('ABSPATH')) {
12 exit;
13}
14
15use danielburger1337\OAuth2\DPoP\NonceStorage\NonceStorageInterface;
16
17class NonceStorage implements NonceStorageInterface
18{
19 /**
20 * Transient prefix.
21 *
22 * @var string
23 */
24 private const PREFIX = "wireservice_dpop_nonce_";
25
26 /**
27 * Nonce TTL in seconds.
28 *
29 * @var int
30 */
31 private const TTL = 300;
32
33 /**
34 * Get the current DPoP-Nonce for an upstream server.
35 *
36 * @param string $key The storage key.
37 * @return string|null The nonce or null.
38 */
39 public function getCurrentNonce(string $key): ?string
40 {
41 $nonce = get_transient(self::PREFIX . $this->hashKey($key));
42 return $nonce !== false ? $nonce : null;
43 }
44
45 /**
46 * Store a new DPoP-Nonce from an upstream server.
47 *
48 * @param string $key The storage key.
49 * @param string $nonce The nonce to store.
50 */
51 public function storeNextNonce(string $key, string $nonce): void
52 {
53 set_transient(self::PREFIX . $this->hashKey($key), $nonce, self::TTL);
54 }
55
56 /**
57 * Hash the key to a safe transient name.
58 *
59 * @param string $key The storage key.
60 * @return string The hashed key.
61 */
62 private function hashKey(string $key): string
63 {
64 return substr(md5($key), 0, 32);
65 }
66}