| 1: | <?php |
| 2: | |
| 3: | declare(strict_types=1); |
| 4: | |
| 5: | /** |
| 6: | * This file is part of the Nexus MCP SDK package. |
| 7: | * |
| 8: | * (c) 2026 John Paul E. Balandan, CPA <paulbalandan@gmail.com> |
| 9: | * |
| 10: | * For the full copyright and license information, please view |
| 11: | * the LICENSE file that was distributed with this source code. |
| 12: | */ |
| 13: | |
| 14: | namespace Nexus\Mcp\Client\Exception; |
| 15: | |
| 16: | use Nexus\Mcp\Core\Exception\McpExceptionInterface; |
| 17: | |
| 18: | /** |
| 19: | * Thrown when an authorization server does not advertise the `S256` code challenge method, which MCP clients |
| 20: | * must have before they may proceed. |
| 21: | * |
| 22: | * @see https://modelcontextprotocol.io/specification/2026-07-28/basic/authorization/security-considerations#authorization-code-protection |
| 23: | */ |
| 24: | final class PkceNotSupportedException extends \RuntimeException implements McpExceptionInterface |
| 25: | { |
| 26: | public function __construct(string $issuer) |
| 27: | { |
| 28: | parent::__construct(\sprintf( |
| 29: | 'The authorization server "%s" does not advertise the S256 code challenge method, so authorization cannot proceed.', |
| 30: | $issuer, |
| 31: | )); |
| 32: | } |
| 33: | } |
| 34: |