构建 JavaScript ChatGPT 插件，你学会了吗？

my-chat-plugin/
├─ .well-known/
│  ├─ ai-plugin.json  <- 插件元数据
├─ routes/
│  ├─ todos.js        <- 处理Todo请求的路由
│  ├─ openai.js       <- 处理openAI请求的路由
openapi.yaml          <- Open API规范
index.js              <- 插件入口

## 1. Create the directory and open it
mkdir my-chat-plugin && cd my-chat-plugin

## 2. Initialize a project with the default values
npm init --yes

## 3. Install our dependencies
npm install axios express cors js-yaml

mkdir .well-known && touch .well-known/ai-plugin.json

{
    "schema_version": "v1",
    "name_for_human": "My ChatGPT To Do Plugin",
    "name_for_model": "todo",
    "description_for_human": "Plugin for managing a To Do list. You can add, remove and view your To Dos.",
    "description_for_model": "Plugin for managing a To Do list. You can add, remove and view your ToDos.",
    "auth": {
        "type": "none"
    },
    "api": {
        "type": "openapi",
        "url": "<http://localhost:3000/openapi.yaml>",
        "is_user_authenticated": false
    },
    "logo_url": "<http://localhost:3000/logo.png>",
    "contact_email": "support@yourdomain.com",
    "legal_info_url": "<http://www.yourdomain.com/legal>"
}

openapi: 3.0.1
info:
  title: TODO Plugin
  description: A plugin that allows the user to create and manage a To Do list using ChatGPT.
  version: 'v1'
servers:
  - url: <http://localhost:3000>
paths:
  /todos:
    get:
      operationId: getTodos
      summary: Get the list of todos
      responses:
        "200":
          description: OK
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Todo'
    post:
      operationId: addTodo
      summary: Add a todo to the list
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Todo'
      responses:
        "201":
          description: Created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Todo'
  /todos/{id}:
    delete:
      operationId: removeTodo
      summary: Delete a todo from the list when it is complete, or no longer required.
      parameters:
        - name: id
          in: path
          required: true
          schema:
            type: integer
      responses:
        "204":
          description: No Content
components:
  schemas:
    Todo:
      type: object
      properties:
        id:
          type: integer
          format: int64
        task:
          type: string
      required:
        - id
        - task

const express = require('express');
const cors = require('cors');
const todoRouter = require('./routes/todos');
const openaiRoutes = require('./routes/openai');

const app = express();
const PORT = 3000;

// Setting CORS to allow chat.openapi.com is required for ChatGPT to access your plugin
app.use(cors({ origin: [`http://localhost:${PORT}`, '<https://chat.openai.com>'] }));
app.use(express.json());

// Simple request logging to see if your plugin is being called by ChatGPT
app.use((req, res, next) => {
  console.log(`Request received: ${req.method}: ${req.path}`)
  next()
})

// OpenAI Required Routes
app.use(openaiRoutes);

// The dummy todos API
app.use('/todos', todoRouter);

app.listen(PORT, () => {
  console.log(`Plugin server listening on port ${PORT}`);
});

const express = require('express');
const router = express.Router();
const fs = require('fs');
const path = require('path');
const yaml = require('js-yaml');

router.get('/openapi.yaml', async function(req, res) {
  try {
    const yamlData = fs.readFileSync(path.join(process.cwd(), 'openapi.yaml'), 'utf8');
    const jsonData = yaml.load(yamlData);
    res.json(jsonData);

  } catch(e) {
    console.log(e.message)
    res.status(500).send({ error: 'Unable to fetch manifest.' });
  }
});

router.get('/.well-known/ai-plugin.json', function(req, res) {
  res.sendFile(path.join(process.cwd(), '/.well-known/ai-plugin.json'));
});

router.get('/logo.png', function(req, res) {
  res.sendFile(path.join(process.cwd(), 'logo.png'));
})

module.exports = router;

const express = require('express');
const router = express.Router();

let todos = [
    { id: 1, task: 'Wake up' },
    { id: 2, task: 'Grab a brush'},
    { id: 3, task: 'Put a little makeup'},
    { id: 4, task: 'Build a Chat Plugin'}
]; // placeholder todos

let currentId = 5; // to assign unique ids to new todos

getTodos = async function(req, res) {
    res.json(todos);
}

addTodo = async function(req, res) {
    const { task } = req.body;
    const newTodo = { id: currentId, task };
    todos.push(newTodo);
    currentId++;
    res.json(newTodo);
}

removeTodo = async function(req, res) {
    const { id } = req.params;
    todos = todos.filter(todo => todo.id !== Number(id));
    res.json({ "message" : "Todo successfully deleted" });
}

router.get('/', getTodos);
router.post('/', addTodo);
router.delete('/:id', removeTodo);

module.exports = router;

// PASTE IN BEFORE app.listen(... 

// Proxy server to an existing API
const api_url = '<http://localhost>';

app.all('/:path', async (req, res) => {
  const { path } = req.params;
  const url = `${api_url}/${path}`;

  console.log(`Forwarding call: ${req.method} ${path} -> ${url}`);

  const headers = {
    'Content-Type': 'application/json',
  };

  try {
    const response = await axios({
      method: req.method,
      url,
      headers,
      params: req.query,
      data: req.body,
    });

    res.send(response.data);
  } catch (error) {
    console.error(`Error in forwarding call: ${error}`);
    res.status(500).send('Error in forwarding call');
  }
});