File Core/Schema/Error/UnsupportedProtocolVersionError.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\Core\Schema\Error;
15:
16:	use Nexus\Assert\Assert;
17:	use Nexus\Mcp\Core\Schema\Enum\ProtocolErrorCode;
18:	use Nexus\Mcp\Core\Schema\Error;
19:
20:	/**
21:	* Returned when the request's protocol version is unknown to the server or unsupported (e.g., a known
22:	* experimental or draft version the server has chosen not to implement). For HTTP, the response status
23:	* code MUST be `400 Bad Request`.
24:	*
25:	* @extends Error<array{
26:	* code: -32022,
27:	* message: non-empty-string,
28:	* data: array{supported: list<string>, requested: string},
29:	* }>
30:	*
31:	* @see https://modelcontextprotocol.io/specification/2026-07-28/schema#unsupportedprotocolversionerror
32:	*/
33:	final readonly class UnsupportedProtocolVersionError extends Error
34:	{
35:	public const string DEFAULT_MESSAGE = 'Unsupported protocol version';
36:
37:	/**
38:	* @param list<string> $supported
39:	* @param non-empty-string $message
40:	*/
41:	public function __construct(
42:	public string $requested,
43:	public array $supported,
44:	string $message = self::DEFAULT_MESSAGE,
45:	) {
46:	parent::__construct(
47:	code: ProtocolErrorCode::UnsupportedProtocolVersion,
48:	message: $message,
49:	data: ['supported' => $supported, 'requested' => $requested],
50:	);
51:	}
52:
53:	#[\Override]
54:	public static function fromArray(array $data): static
55:	{
56:	$message = $data['message'] ?? self::DEFAULT_MESSAGE;
57:	Assert::that($message)->isNonEmptyString('error "message" must be a non-empty string, {type} given.');
58:
59:	$payload = $data['data'] ?? null;
60:	Assert::that($payload)
61:	->isArray('error "data" must be an object, {type} given.')
62:	->isMap('error "data" must be a string-keyed object.')
63:	;
64:
65:	Assert::that($payload)->hasOffset('requested', 'error "data" is missing the required "requested" key.');
66:	Assert::that($payload['requested'])->isString('error "data.requested" must be a string, {type} given.');
67:	$requested = $payload['requested'];
68:
69:	Assert::that($payload)->hasOffset('supported', 'error "data" is missing the required "supported" key.');
70:	Assert::that($payload['supported'])
71:	->isList('error "data.supported" must be a list of strings, {type} given.')
72:	->values()->isString('each error "data.supported" must be a string, {type} given.')
73:	;
74:	$supported = $payload['supported'];
75:
76:	return new self(requested: $requested, supported: $supported, message: $message);
77:	}
78:
79:	#[\Override]
80:	public function toArray(): array
81:	{
82:	return [
83:	'code' => ProtocolErrorCode::UnsupportedProtocolVersion->value,
84:	'message' => $this->message,
85:	'data' => ['supported' => $this->supported, 'requested' => $this->requested],
86:	];
87:	}
88:	}
89:

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