MCP Fetch

import { Express, Request, Response } from 'express' import { graphql, buildSchema } from 'graphql' // Define a test schema const schema = buildSchema(` type User { id: ID! name: String! email: String! posts: [Post!]! } type Post { id: ID! title: String! content: String! author: User! createdAt: String! } type Query { users: [User!]! user(id: ID!): User posts: [Post!]! post(id: ID!): Post hello(name: String): String! } type Mutation { createUser(input: CreateUserInput!): User! updateUser(id: ID!, input: UpdateUserInput!): User! deleteUser(id: ID!): Boolean! createPost(input: CreatePostInput!): Post! } input CreateUserInput { name: String! email: String! } input UpdateUserInput { name: String email: String } input CreatePostInput { title: String! content: String! authorId: ID! } `) // Mock data const users = [ { id: '1', name: 'John Doe', email: 'john@example.com' }, { id: '2', name: 'Jane Smith', email: 'jane@example.com' }, ] const posts = [ { id: '1', title: 'First Post', content: 'This is my first post', authorId: '1', createdAt: new Date().toISOString() }, { id: '2', title: 'Second Post', content: 'Another great post', authorId: '2', createdAt: new Date().toISOString() }, ] // Define root resolver const rootValue = { // Query resolvers users: () => users.map(u => ({ ...u, posts: () => posts.filter(p => p.authorId === u.id).map(p => ({ ...p, author: () => users.find(user => user.id === p.authorId) })) })), user: ({ id }: { id: string }) => { const user = users.find(u => u.id === id) if (!user) return null return { ...user, posts: () => posts.filter(p => p.authorId === user.id).map(p => ({ ...p, author: () => users.find(u => u.id === p.authorId) })) } }, posts: () => posts.map(p => ({ ...p, author: () => users.find(u => u.id === p.authorId) })), post: ({ id }: { id: string }) => { const post = posts.find(p => p.id === id) if (!post) return null return { ...post, author: () => users.find(u => u.id === post.authorId) } }, hello: ({ name }: { name?: string }) => `Hello ${name || 'World'}!`, // Mutation resolvers createUser: ({ input }: { input: any }) => { const newUser = { id: String(users.length + 1), ...input } users.push(newUser) return { ...newUser, posts: () => [] } }, updateUser: ({ id, input }: { id: string, input: any }) => { const userIndex = users.findIndex(u => u.id === id) if (userIndex === -1) throw new Error('User not found') users[userIndex] = { ...users[userIndex], ...input } const updatedUser = users[userIndex] return { ...updatedUser, posts: () => posts.filter(p => p.authorId === updatedUser.id).map(p => ({ ...p, author: () => users.find(u => u.id === p.authorId) })) } }, deleteUser: ({ id }: { id: string }) => { const userIndex = users.findIndex(u => u.id === id) if (userIndex === -1) return false users.splice(userIndex, 1) return true }, createPost: ({ input }: { input: any }) => { const newPost = { id: String(posts.length + 1), ...input, createdAt: new Date().toISOString() } posts.push(newPost) return { ...newPost, author: () => users.find(u => u.id === newPost.authorId) } }, } export async function createGraphQLServer(app: Express) { // Add GraphQL endpoint app.post('/graphql', async (req: Request, res: Response) => { const { query, variables, operationName } = req.body try { const result = await graphql({ schema, source: query, rootValue, contextValue: { token: req.headers.authorization, headers: req.headers }, variableValues: variables, operationName }) res.json(result) } catch (error) { res.status(500).json({ errors: [{ message: error instanceof Error ? error.message : 'Internal server error' }] }) } }) // Add GraphQL introspection endpoint (for the introspect tool) app.get('/graphql', (req: Request, res: Response) => { res.json({ message: 'GraphQL endpoint is running. Use POST for queries.' }) }) }