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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Configures native PHP Redis-backed sessions with connectivity checks. |
| 5 | * |
| 6 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 7 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 8 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 9 | * |
| 10 | * @package phpMyFAQ |
| 11 | * @author Thorsten Rinne <thorsten@phpmyfaq.de> |
| 12 | * @copyright 2026 phpMyFAQ Team |
| 13 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 14 | * @link https://www.phpmyfaq.de |
| 15 | * @since 2026-02-14 |
| 16 | */ |
| 17 | |
| 18 | declare(strict_types=1); |
| 19 | |
| 20 | namespace phpMyFAQ\Session; |
| 21 | |
| 22 | use RuntimeException; |
| 23 | |
| 24 | class RedisSessionHandler |
| 25 | { |
| 26 | public const string DEFAULT_DSN = 'tcp://redis:6379?database=0'; |
| 27 | |
| 28 | /* @mago-expect lint:no-ini-set - registering the Redis session handler requires runtime session settings */ |
| 29 | public static function configure(string $dsn = '', bool $validate = false): void |
| 30 | { |
| 31 | if (!extension_loaded('redis')) { |
| 32 | throw new RuntimeException('Redis session handler requires the PHP redis extension (ext-redis).'); |
| 33 | } |
| 34 | |
| 35 | $redisDsn = trim($dsn) !== '' ? trim($dsn) : self::DEFAULT_DSN; |
| 36 | |
| 37 | if ($validate) { |
| 38 | self::validateConnection($redisDsn); |
| 39 | } |
| 40 | |
| 41 | ini_set('session.save_handler', value: 'redis'); |
| 42 | ini_set('session.save_path', value: $redisDsn); |
| 43 | } |
| 44 | |
| 45 | private const float MAX_TIMEOUT_SECONDS = 3.0; |
| 46 | |
| 47 | public static function validateConnection(string $dsn, float $timeoutSeconds = 1.0): void |
| 48 | { |
| 49 | $timeoutSeconds = min(max($timeoutSeconds, 0.1), self::MAX_TIMEOUT_SECONDS); |
| 50 | |
| 51 | [$socketTarget, $displayTarget] = self::buildSocketTarget($dsn); |
| 52 | |
| 53 | $errno = 0; |
| 54 | $errorString = ''; |
| 55 | /* @mago-expect lint:no-error-control-operator - connection failure is reported via $errno/$errorString below */ |
| 56 | $connection = @stream_socket_client( |
| 57 | $socketTarget, |
| 58 | $errno, |
| 59 | $errorString, |
| 60 | $timeoutSeconds, |
| 61 | STREAM_CLIENT_CONNECT, |
| 62 | ); |
| 63 | |
| 64 | if ($connection === false) { |
| 65 | throw new RuntimeException(sprintf('Redis connection failed for %s.', $displayTarget)); |
| 66 | } |
| 67 | |
| 68 | // Verify the service speaks Redis by sending PING and checking for +PONG |
| 69 | fwrite($connection, data: "PING\r\n"); |
| 70 | stream_set_timeout($connection, (int) ceil($timeoutSeconds)); |
| 71 | $response = fgets($connection, length: 128); |
| 72 | fclose($connection); |
| 73 | |
| 74 | if ($response === false || !str_starts_with(trim($response), '+PONG')) { |
| 75 | throw new RuntimeException(sprintf('Redis connection failed for %s.', $displayTarget)); |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * @return array{0: string, 1: string} |
| 81 | */ |
| 82 | private static function buildSocketTarget(string $dsn): array |
| 83 | { |
| 84 | $parsedUrl = parse_url($dsn); |
| 85 | if (!is_array($parsedUrl) || !array_key_exists('scheme', $parsedUrl)) { |
| 86 | throw new RuntimeException('Invalid Redis DSN for sessions.'); |
| 87 | } |
| 88 | |
| 89 | $scheme = strtolower($parsedUrl['scheme']); |
| 90 | if ($scheme === 'redis' || $scheme === 'tcp') { |
| 91 | $host = $parsedUrl['host'] ?? '127.0.0.1'; |
| 92 | $port = (int) ($parsedUrl['port'] ?? 6379); |
| 93 | return [sprintf('tcp://%s:%d', $host, $port), sprintf('%s:%d', $host, $port)]; |
| 94 | } |
| 95 | |
| 96 | if ($scheme === 'unix') { |
| 97 | $path = $parsedUrl['path'] ?? ''; |
| 98 | if ($path === '') { |
| 99 | throw new RuntimeException('Invalid Redis unix socket DSN for sessions.'); |
| 100 | } |
| 101 | |
| 102 | return ['unix://' . $path, $path]; |
| 103 | } |
| 104 | |
| 105 | throw new RuntimeException(sprintf('Unsupported Redis DSN scheme "%s" for sessions.', $scheme)); |
| 106 | } |
| 107 | } |