File Core/Schema/JsonRpc/JsonRpcErrorResponse.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\JsonRpc;
15:
16:	use Nexus\Assert\Assert;
17:	use Nexus\Mcp\Core\JsonRpc\ErrorFactory;
18:	use Nexus\Mcp\Core\Schema\Arrayable;
19:	use Nexus\Mcp\Core\Schema\Enum\ProtocolErrorCode;
20:	use Nexus\Mcp\Core\Schema\Error;
21:	use Nexus\Mcp\Core\Schema\Error\UnknownProtocolError;
22:	use Nexus\Mcp\Core\Schema\Error\UrlElicitationRequiredErrorPayload;
23:	use Nexus\Mcp\Core\Schema\RequestId;
24:
25:	/**
26:	* A response to a request that indicates an error occurred.
27:	*
28:	* @implements Arrayable<array{
29:	* jsonrpc: '2.0',
30:	* id?: int\|non-empty-string,
31:	* error: template-type<Error, Arrayable, 'T'>,
32:	* }>
33:	*
34:	* @see https://modelcontextprotocol.io/specification/2025-11-25/schema#jsonrpcerrorresponse
35:	*/
36:	final readonly class JsonRpcErrorResponse implements Arrayable, JsonRpcResponse
37:	{
38:	public function __construct(public ?RequestId $id, public Error $error)
39:	{
40:	}
41:
42:	/**
43:	* @param array<string, mixed> $data
44:	*/
45:	#[\Override]
46:	public static function fromArray(array $data): static
47:	{
48:	$data += ['id' => null, 'error' => []];
49:
50:	$id = $data['id'];
51:
52:	Assert::that($id)
53:	->nullOr()
54:	->isArrayKey('JSON-RPC error response id must be an int, string, or null; {type} given.')
55:	;
56:
57:	Assert::that($data['error'])
58:	->isArray('JSON-RPC error response "error" must be an object, {type} given.')
59:	->isMap('JSON-RPC error response "error" must be a string-keyed object.')
60:	;
61:
62:	return new self(
63:	null === $id ? null : new RequestId($id),
64:	self::parseError($data['error']),
65:	);
66:	}
67:
68:	#[\Override]
69:	public function toArray(): array
70:	{
71:	$envelope = ['jsonrpc' => self::JSONRPC_VERSION];
72:
73:	if (null !== $this->id) {
74:	$envelope['id'] = $this->id->id;
75:	}
76:
77:	$envelope['error'] = $this->error->toArray();
78:
79:	return $envelope;
80:	}
81:
82:	/**
83:	* @return array{
84:	* jsonrpc: '2.0',
85:	* id?: int\|non-empty-string,
86:	* error: template-type<Error, Arrayable, 'T'>,
87:	* }
88:	*/
89:	#[\Override]
90:	public function jsonSerialize(): array
91:	{
92:	return $this->toArray();
93:	}
94:
95:	/**
96:	* @param array<string, mixed> $data
97:	*/
98:	private static function parseError(array $data): Error
99:	{
100:	Assert::that($data)->hasOffset('code', 'error response missing the required "code" key.');
101:	Assert::that($data['code'])->isInt('error response "code" must be an integer, {type} given.');
102:	$code = $data['code'];
103:
104:	Assert::that($data)->hasOffset('message', 'error response missing the required "message" key.');
105:	Assert::that($data['message'])->isString('error response "message" must be a string, {type} given.');
106:	$message = $data['message'];
107:
108:	$extra = $data['data'] ?? null;
109:	$narrow = ['message' => $message];
110:
111:	if (null !== $extra) {
112:	$narrow['data'] = $extra;
113:	}
114:
115:	$resolved = ProtocolErrorCode::tryFrom($code);
116:
117:	if (ProtocolErrorCode::UrlElicitationRequired === $resolved) {
118:	return UrlElicitationRequiredErrorPayload::fromArray($narrow);
119:	}
120:
121:	if (null === $resolved) {
122:	return new UnknownProtocolError($code, $message, $extra);
123:	}
124:
125:	return ErrorFactory::create($resolved, $message, $extra);
126:	}
127:	}
128:

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