feat: 添加后端接口

service/index.ts

@@ -0,0 +1,41 @@
+import dotenv from 'dotenv'
+import { ChatGPTAPI } from 'chatgpt'
+import express from 'express'
+
+dotenv.config()
+
+const app = express()
+
+app.use(express.json())
+
+async function chatAPI(message: string) {
+  if (!message)
+    throw new Error('Message is not defined')
+
+  if (!process.env.OPENAI_API_KEY)
+    throw new Error('OPENAI_API_KEY is not defined in .env file')
+
+  try {
+    const api = new ChatGPTAPI({ apiKey: process.env.OPENAI_API_KEY })
+    const res = await api.sendMessage(message)
+    return res
+  }
+  catch (error) {
+    return error
+  }
+}
+
+app.all('*', (req, res, next) => {
+  res.header('Access-Control-Allow-Origin', '*')
+  res.header('Access-Control-Allow-Headers', 'Content-Type')
+  res.header('Access-Control-Allow-Methods', '*')
+  next()
+})
+
+app.listen(3002, () => globalThis.console.log('Server is running on port 3002'))
+
+app.post('/chat', async (req, res) => {
+  const { message } = req.body
+  const response = await chatAPI(message)
+  res.send(response)
+})