File Client/Exception/InsufficientScopeException.php

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 MCP server answers that the token's scopes are insufficient and the client is configured to
20:	* report that rather than ask the resource owner for more.
21:	*
22:	* @see https://datatracker.ietf.org/doc/html/rfc6750#section-3.1
23:	*/
24:	final class InsufficientScopeException extends \RuntimeException implements McpExceptionInterface
25:	{
26:	/**
27:	* @param list<non-empty-string> $required Scopes the challenge named, empty when it named none
28:	*/
29:	public function __construct(public readonly array $required)
30:	{
31:	parent::__construct([] === $required
32:	? 'The MCP server requires a scope the token does not carry, and named none.'
33:	: \sprintf('The MCP server requires the scope "%s", which the token does not carry.', implode(' ', $required)));
34:	}
35:	}
36: