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1<?php
2
3declare(strict_types=1);
4
5namespace LambdaTwelve\OneRecord\Auth\Jwt;
6
7/**
8 * Trusted issuers configured in code: each with one PEM public key, a list
9 * of them, or a map of key id to PEM. This is what a host with a handful of
10 * partners needs; JwksKeyResolver covers identity providers that publish keys.
11 */
12final class StaticKeyResolver implements KeyResolver
13{
14    /** @var array<string, array<string|int, string>> */
15    private array $keys = [];
16
17    /**
18     * @param array<string, string|list<string>|array<string, string>> $issuers issuer => PEM, PEMs, or kid => PEM
19     */
20    public function __construct(array $issuers)
21    {
22        foreach ($issuers as $issuer => $keys) {
23            $this->keys[$issuer] = \is_string($keys) ? [$keys] : $keys;
24        }
25    }
26
27    public function publicKeys(string $issuer, ?string $keyId): array
28    {
29        $keys = $this->keys[$issuer] ?? [];
30        if ($keyId !== null && isset($keys[$keyId])) {
31            return [$keys[$keyId]];
32        }
33
34        return array_values($keys);
35    }
36}