Jason Thistlethwaite
260 lines
9.7 KiB
PHP
260 lines
9.7 KiB
PHP
<?php
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declare(strict_types=1);
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namespace RedMCP;
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use RuntimeException;
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use Throwable;
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final class McpDispatcher
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{
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private RedmineClient $redmine;
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public function __construct(RedmineClient $redmine)
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{
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$this->redmine = $redmine;
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}
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/**
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* @param array<string,mixed> $message
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*
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* @return array<string,mixed>|null
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*/
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public function handleMessage(array $message): ?array
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{
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$id = $message['id'] ?? null;
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if ($id === null) {
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return null;
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}
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try {
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$method = (string) ($message['method'] ?? '');
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$params = is_array($message['params'] ?? null) ? $message['params'] : [];
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return ['jsonrpc' => '2.0', 'id' => $id, 'result' => $this->dispatch($method, $params)];
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} catch (Throwable $exception) {
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return [
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'jsonrpc' => '2.0',
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'id' => $id,
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'error' => [
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'code' => -32000,
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'message' => $exception->getMessage(),
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],
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];
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}
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}
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/**
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* @param array<string,mixed> $params
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*
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* @return array<string,mixed>
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*/
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private function dispatch(string $method, array $params): array
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{
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switch ($method) {
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case 'initialize':
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return [
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'protocolVersion' => '2025-03-26',
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'capabilities' => [
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'tools' => ['listChanged' => false],
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],
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'serverInfo' => [
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'name' => 'redMCP',
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'version' => '0.1.0',
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],
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];
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case 'ping':
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return [];
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case 'tools/list':
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return ['tools' => $this->tools()];
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case 'tools/call':
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return $this->callTool($params);
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case 'resources/list':
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return ['resources' => []];
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case 'prompts/list':
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return ['prompts' => []];
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default:
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throw new RuntimeException('Unsupported MCP method: ' . $method);
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}
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}
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/**
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* @return array<int,array<string,mixed>>
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*/
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private function tools(): array
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{
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return [
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$this->tool('redmine_list_issues', 'List Redmine issues using native /issues.json filters.', [
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'filters' => ['type' => 'object', 'description' => 'Redmine issue list filters such as project_id, status_id, query_id, sort, offset, and limit.'],
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]),
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$this->tool('redmine_search', 'Search Redmine using native /search.json.', [
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'query' => ['type' => 'string'],
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'params' => ['type' => 'object', 'description' => 'Redmine search params such as project_id, all_words, titles_only, offset, and limit.'],
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], ['query']),
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$this->tool('redmine_search_issues', 'Search only issues using native /search.json.', [
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'query' => ['type' => 'string'],
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'params' => ['type' => 'object', 'description' => 'Additional Redmine search params.'],
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], ['query']),
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$this->tool('redmine_get_issue', 'Fetch one Redmine issue.', [
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'issue_id' => ['type' => 'integer'],
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'include' => ['type' => 'array', 'items' => ['type' => 'string'], 'description' => 'Issue includes such as journals, attachments, children, relations, changesets.'],
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], ['issue_id']),
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$this->tool('redmine_issue_with_helpdesk', 'Fetch one issue plus Helpdesk ticket/message context when available.', [
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'issue_id' => ['type' => 'integer'],
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'message_limit' => ['type' => 'integer', 'minimum' => 1, 'maximum' => 200],
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'include' => ['type' => 'array', 'items' => ['type' => 'string']],
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], ['issue_id']),
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$this->tool('redmine_create_issue', 'Create a Redmine issue.', [
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'fields' => ['type' => 'object', 'description' => 'Issue fields including project_id and subject.'],
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], ['fields']),
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$this->tool('redmine_update_issue', 'Update a Redmine issue. Helpdesk email is opt-in.', [
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'issue_id' => ['type' => 'integer'],
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'fields' => ['type' => 'object'],
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'options' => ['type' => 'object', 'description' => 'Pass send_helpdesk_email=true only for customer-visible Helpdesk replies.'],
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], ['issue_id', 'fields']),
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$this->tool('redmine_delete_issue', 'Delete a Redmine issue.', [
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'issue_id' => ['type' => 'integer'],
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], ['issue_id']),
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$this->tool('redmine_send_helpdesk_response', 'Send a customer-visible Helpdesk email response.', [
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'issue_id' => ['type' => 'integer'],
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'content' => ['type' => 'string'],
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'options' => ['type' => 'object', 'description' => 'Optional to_address, cc_address, bcc_address, and status_id.'],
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], ['issue_id', 'content']),
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];
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}
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/**
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* @param array<string,mixed> $properties
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* @param array<int,string> $required
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*
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* @return array<string,mixed>
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*/
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private function tool(string $name, string $description, array $properties, array $required = []): array
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{
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return [
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'name' => $name,
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'description' => $description,
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'inputSchema' => [
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'type' => 'object',
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'properties' => $properties,
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'required' => $required,
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'additionalProperties' => false,
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],
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];
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}
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/**
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* @param array<string,mixed> $params
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*
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* @return array<string,mixed>
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*/
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private function callTool(array $params): array
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{
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$name = (string) ($params['name'] ?? '');
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$arguments = is_array($params['arguments'] ?? null) ? $params['arguments'] : [];
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switch ($name) {
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case 'redmine_list_issues':
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$result = $this->redmine->filterIssues($this->objectArg($arguments, 'filters'));
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break;
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case 'redmine_search':
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$result = $this->redmine->search($this->stringArg($arguments, 'query'), $this->objectArg($arguments, 'params'));
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break;
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case 'redmine_search_issues':
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$result = $this->redmine->searchIssues($this->stringArg($arguments, 'query'), $this->objectArg($arguments, 'params'));
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break;
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case 'redmine_get_issue':
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$result = $this->redmine->issue($this->intArg($arguments, 'issue_id'), $this->stringListArg($arguments, 'include', ['journals', 'attachments']));
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break;
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case 'redmine_issue_with_helpdesk':
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$result = $this->redmine->issueWithHelpdesk(
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$this->intArg($arguments, 'issue_id'),
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$this->intArg($arguments, 'message_limit', 100),
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$this->stringListArg($arguments, 'include', ['journals', 'attachments'])
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);
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break;
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case 'redmine_create_issue':
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$result = $this->redmine->createIssue($this->objectArg($arguments, 'fields'));
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break;
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case 'redmine_update_issue':
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$result = ['ok' => $this->redmine->updateIssue($this->intArg($arguments, 'issue_id'), $this->objectArg($arguments, 'fields'), $this->objectArg($arguments, 'options'))];
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break;
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case 'redmine_delete_issue':
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$result = ['ok' => $this->redmine->deleteIssue($this->intArg($arguments, 'issue_id'))];
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break;
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case 'redmine_send_helpdesk_response':
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$result = $this->redmine->sendHelpdeskIssueResponse($this->intArg($arguments, 'issue_id'), $this->stringArg($arguments, 'content'), $this->objectArg($arguments, 'options'));
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break;
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default:
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throw new RuntimeException('Unknown tool: ' . $name);
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}
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$encoded = json_encode($result, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);
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if ($encoded === false) {
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throw new RuntimeException('Could not encode tool result.');
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}
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return [
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'content' => [
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[
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'type' => 'text',
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'text' => $encoded,
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],
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],
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];
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}
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/**
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* @param array<string,mixed> $arguments
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*
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* @return array<string,mixed>
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*/
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private function objectArg(array $arguments, string $key): array
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{
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return is_array($arguments[$key] ?? null) ? $arguments[$key] : [];
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}
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/**
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* @param array<string,mixed> $arguments
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*/
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private function stringArg(array $arguments, string $key): string
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{
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$value = trim((string) ($arguments[$key] ?? ''));
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if ($value === '') {
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throw new RuntimeException($key . ' is required.');
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}
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return $value;
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}
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/**
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* @param array<string,mixed> $arguments
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*/
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private function intArg(array $arguments, string $key, ?int $default = null): int
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{
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if (!isset($arguments[$key])) {
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if ($default !== null) {
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return $default;
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}
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throw new RuntimeException($key . ' is required.');
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}
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return (int) $arguments[$key];
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}
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/**
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* @param array<string,mixed> $arguments
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* @param array<int,string> $default
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*
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* @return array<int,string>
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*/
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private function stringListArg(array $arguments, string $key, array $default): array
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{
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if (!isset($arguments[$key]) || !is_array($arguments[$key])) {
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return $default;
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}
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return array_values(array_filter(array_map('strval', $arguments[$key])));
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}
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}
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