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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * OIDC HTTP client helper. |
| 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 2026-04-18 |
| 16 | */ |
| 17 | |
| 18 | declare(strict_types=1); |
| 19 | |
| 20 | namespace phpMyFAQ\Auth\Oidc; |
| 21 | |
| 22 | use JsonException; |
| 23 | use RuntimeException; |
| 24 | use SensitiveParameter; |
| 25 | use Symfony\Contracts\HttpClient\Exception\ExceptionInterface; |
| 26 | use Symfony\Contracts\HttpClient\HttpClientInterface; |
| 27 | |
| 28 | final readonly class OidcClient |
| 29 | { |
| 30 | public function __construct( |
| 31 | private HttpClientInterface $httpClient, |
| 32 | ) { |
| 33 | } |
| 34 | |
| 35 | public function buildAuthorizationUrl( |
| 36 | OidcProviderConfig $config, |
| 37 | OidcDiscoveryDocument $discoveryDocument, |
| 38 | string $state, |
| 39 | string $nonce, |
| 40 | string $codeChallenge, |
| 41 | ): string { |
| 42 | $query = http_build_query([ |
| 43 | 'response_type' => 'code', |
| 44 | 'client_id' => $config->client->clientId, |
| 45 | 'redirect_uri' => $config->client->redirectUri, |
| 46 | 'scope' => $config->client->getScopesAsString(), |
| 47 | 'state' => $state, |
| 48 | 'nonce' => $nonce, |
| 49 | 'code_challenge' => $codeChallenge, |
| 50 | 'code_challenge_method' => 'S256', |
| 51 | ]); |
| 52 | |
| 53 | return $discoveryDocument->authorizationEndpoint . '?' . $query; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * @return array<string, mixed> |
| 58 | * @throws ExceptionInterface |
| 59 | */ |
| 60 | public function exchangeAuthorizationCode( |
| 61 | OidcProviderConfig $config, |
| 62 | OidcDiscoveryDocument $discoveryDocument, |
| 63 | string $code, |
| 64 | #[SensitiveParameter] |
| 65 | string $codeVerifier, |
| 66 | ): array { |
| 67 | $response = $this->httpClient->request('POST', $discoveryDocument->tokenEndpoint, [ |
| 68 | 'body' => [ |
| 69 | 'grant_type' => 'authorization_code', |
| 70 | 'code' => $code, |
| 71 | 'client_id' => $config->client->clientId, |
| 72 | 'client_secret' => $config->client->clientSecret, |
| 73 | 'redirect_uri' => $config->client->redirectUri, |
| 74 | 'code_verifier' => $codeVerifier, |
| 75 | ], |
| 76 | ]); |
| 77 | |
| 78 | $payload = $this->decodeJsonResponse($response->getContent(false), $response->getStatusCode(), 'token'); |
| 79 | if ( |
| 80 | !array_key_exists('access_token', $payload) |
| 81 | || !is_string($payload['access_token']) |
| 82 | || $payload['access_token'] === '' |
| 83 | ) { |
| 84 | throw new RuntimeException('OIDC token response did not contain a valid access_token'); |
| 85 | } |
| 86 | |
| 87 | return $payload; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * @return array<string, mixed> |
| 92 | * @throws ExceptionInterface |
| 93 | */ |
| 94 | public function fetchUserInfo( |
| 95 | OidcDiscoveryDocument $discoveryDocument, |
| 96 | #[SensitiveParameter] |
| 97 | string $accessToken, |
| 98 | ): array { |
| 99 | $response = $this->httpClient->request('GET', $discoveryDocument->userInfoEndpoint, [ |
| 100 | 'headers' => [ |
| 101 | 'Authorization' => 'Bearer ' . $accessToken, |
| 102 | ], |
| 103 | ]); |
| 104 | |
| 105 | return $this->decodeJsonResponse($response->getContent(false), $response->getStatusCode(), 'userinfo'); |
| 106 | } |
| 107 | |
| 108 | public function buildLogoutUrl( |
| 109 | OidcProviderConfig $config, |
| 110 | OidcDiscoveryDocument $discoveryDocument, |
| 111 | #[SensitiveParameter] |
| 112 | string $idTokenHint = '', |
| 113 | ): ?string { |
| 114 | if ($discoveryDocument->endSessionEndpoint === null || $discoveryDocument->endSessionEndpoint === '') { |
| 115 | return null; |
| 116 | } |
| 117 | |
| 118 | $query = [ |
| 119 | 'client_id' => $config->client->clientId, |
| 120 | ]; |
| 121 | |
| 122 | if ($config->logoutRedirectUrl !== '') { |
| 123 | $query['post_logout_redirect_uri'] = $config->logoutRedirectUrl; |
| 124 | } |
| 125 | |
| 126 | if ($idTokenHint !== '') { |
| 127 | $query['id_token_hint'] = $idTokenHint; |
| 128 | } |
| 129 | |
| 130 | return $discoveryDocument->endSessionEndpoint . '?' . http_build_query($query); |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * @return array<string, mixed> |
| 135 | */ |
| 136 | private function decodeJsonResponse(string $content, int $statusCode, string $context): array |
| 137 | { |
| 138 | if ($statusCode >= 400) { |
| 139 | throw new RuntimeException(sprintf('OIDC %s request failed with status %d', $context, $statusCode)); |
| 140 | } |
| 141 | |
| 142 | try { |
| 143 | $payload = json_decode($content, associative: true, depth: 512, flags: JSON_THROW_ON_ERROR); |
| 144 | } catch (JsonException $exception) { |
| 145 | throw new RuntimeException(sprintf('OIDC %s response is not valid JSON', $context), previous: $exception); |
| 146 | } |
| 147 | |
| 148 | if (!is_array($payload)) { |
| 149 | throw new RuntimeException(sprintf( |
| 150 | 'OIDC %s response is not a JSON object/array, got %s', |
| 151 | $context, |
| 152 | gettype($payload), |
| 153 | )); |
| 154 | } |
| 155 | |
| 156 | $normalizedPayload = []; |
| 157 | foreach ($payload as $payloadKey => $payloadValue) { |
| 158 | $normalizedPayload[(string) $payloadKey] = $payloadValue; |
| 159 | } |
| 160 | |
| 161 | return $normalizedPayload; |
| 162 | } |
| 163 | } |