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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Queue\Process; |
| 16 | |
| 17 | /** |
| 18 | * Payload signer class - HMAC-signs/verifies the serialized bytes every |
| 19 | * storage adapter writes, closing the unserialize() object-injection gap |
| 20 | * for anyone who can write to the underlying storage directly (a |
| 21 | * compromised Redis instance, SQL injection elsewhere in the host app, a |
| 22 | * writable queue directory). Static-only, mirroring |
| 23 | * Laravel\SerializableClosure::setSecretKey()'s own static-global shape - |
| 24 | * a familiar idiom already present in this project's dependency tree. |
| 25 | * |
| 26 | * When no key is configured (the default), sign()/verify() are exact |
| 27 | * pass-throughs - zero behavior change from every adapter's current, |
| 28 | * unsigned serialize()/unserialize() round-trip. Once setKey() is called |
| 29 | * (recommended once, at application bootstrap, before any queue/worker |
| 30 | * operation), sign() prepends a raw 32-byte HMAC-SHA256 and verify() |
| 31 | * checks it with hash_equals() before returning the payload bytes - a |
| 32 | * failed check means the caller must never pass those bytes to |
| 33 | * unserialize() at all. |
| 34 | * |
| 35 | * @category Pop |
| 36 | * @package Pop\Queue |
| 37 | * @author Nick Sagona, III <nick@popphp.org> |
| 38 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 39 | * @license https://www.popphp.org/license New BSD License |
| 40 | * @version 3.0.0 |
| 41 | */ |
| 42 | final class PayloadSigner |
| 43 | { |
| 44 | |
| 45 | /** |
| 46 | * Signing key. Null (the default) disables signing entirely - sign() |
| 47 | * and verify() both become pass-throughs. |
| 48 | * @var ?string |
| 49 | */ |
| 50 | protected static ?string $key = null; |
| 51 | |
| 52 | /** |
| 53 | * Set the signing key. Pass null to disable signing again. |
| 54 | * |
| 55 | * @param ?string $key |
| 56 | * @return void |
| 57 | */ |
| 58 | public static function setKey(?string $key): void |
| 59 | { |
| 60 | self::$key = $key; |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Whether a signing key is currently configured |
| 65 | * |
| 66 | * @return bool |
| 67 | */ |
| 68 | public static function hasKey(): bool |
| 69 | { |
| 70 | return (self::$key !== null); |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Sign a payload. Pass-through when no key is configured. |
| 75 | * |
| 76 | * @param string $payload |
| 77 | * @return string |
| 78 | */ |
| 79 | public static function sign(string $payload): string |
| 80 | { |
| 81 | if (self::$key === null) { |
| 82 | return $payload; |
| 83 | } |
| 84 | |
| 85 | return hash_hmac('sha256', $payload, self::$key, true) . $payload; |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Verify a signed payload, returning the original payload bytes on |
| 90 | * success. Pass-through when no key is configured. Returns false on |
| 91 | * any verification failure (missing/truncated signature, tampered |
| 92 | * signature, tampered payload, or a payload signed with a different |
| 93 | * key) - callers must never unserialize() the input when this returns |
| 94 | * false. |
| 95 | * |
| 96 | * @param string $signed |
| 97 | * @return string|false |
| 98 | */ |
| 99 | public static function verify(string $signed): string|false |
| 100 | { |
| 101 | if (self::$key === null) { |
| 102 | return $signed; |
| 103 | } |
| 104 | |
| 105 | if (strlen($signed) < 32) { |
| 106 | return false; |
| 107 | } |
| 108 | |
| 109 | $mac = substr($signed, 0, 32); |
| 110 | $body = substr($signed, 32); |
| 111 | |
| 112 | return hash_equals(hash_hmac('sha256', $body, self::$key, true), $mac) ? $body : false; |
| 113 | } |
| 114 | |
| 115 | } |