OpenAPI Schema Explorer

import { ReadResourceTemplateCallback, ResourceTemplate, } from '@modelcontextprotocol/sdk/server/mcp.js'; import { Variables } from '@modelcontextprotocol/sdk/shared/uriTemplate.js'; import { SpecLoaderService } from '../types.js'; import { IFormatter } from '../services/formatters.js'; import { RenderablePathItem } from '../rendering/path-item.js'; import { RenderContext, RenderResultItem } from '../rendering/types.js'; import { createErrorResult } from '../rendering/utils.js'; import { buildPathItemUriSuffix } from '../utils/uri-builder.js'; // Added .js extension // Import shared handler utils import { formatResults, isOpenAPIV3, FormattedResultItem, getValidatedPathItem, // Import the helper } from './handler-utils.js'; // Already has .js const BASE_URI = 'openapi://'; // Removed duplicated FormattedResultItem type - now imported from handler-utils // Removed duplicated formatResults function - now imported from handler-utils // Removed duplicated isOpenAPIV3 function - now imported from handler-utils /** * Handles requests for listing methods for a specific path. * Corresponds to the `openapi://paths/{path}` template. */ export class PathItemHandler { constructor( private specLoader: SpecLoaderService, private formatter: IFormatter // Although unused in list view, needed for context ) {} getTemplate(): ResourceTemplate { // TODO: Add completion logic if needed return new ResourceTemplate(`${BASE_URI}paths/{path}`, { list: undefined, complete: undefined, }); } handleRequest: ReadResourceTemplateCallback = async ( uri: URL, variables: Variables ): Promise<{ contents: FormattedResultItem[] }> => { const encodedPath = variables.path as string; // Decode the path received from the URI variable const decodedPath = decodeURIComponent(encodedPath || ''); // Use the builder to create the suffix, which will re-encode the path correctly const pathUriSuffix = buildPathItemUriSuffix(decodedPath); const context: RenderContext = { formatter: this.formatter, baseUri: BASE_URI }; let resultItems: RenderResultItem[]; try { const spec = await this.specLoader.getTransformedSpec({ resourceType: 'schema', // Use 'schema' for now format: 'openapi', }); // Use imported type guard if (!isOpenAPIV3(spec)) { throw new Error('Only OpenAPI v3 specifications are supported'); } // --- Use helper to get validated path item --- const lookupPath = decodedPath.startsWith('/') ? decodedPath : `/${decodedPath}`; const pathItemObj = getValidatedPathItem(spec, lookupPath); // Instantiate RenderablePathItem with the validated pathItemObj const renderablePathItem = new RenderablePathItem( pathItemObj, // pathItemObj retrieved safely via helper lookupPath, // Pass the raw, decoded path pathUriSuffix // Pass the correctly built suffix ); resultItems = renderablePathItem.renderList(context); } catch (error: unknown) { const message = error instanceof Error ? error.message : String(error); console.error(`Error handling request ${uri.href}: ${message}`); resultItems = createErrorResult(pathUriSuffix, message); } // Use imported formatResults const contents = formatResults(context, resultItems); return { contents }; }; }