Add backend server code

backend/.gitignore

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+.DS_Store
+node_modules

backend/package.json

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+{
+  "name": "nodejs",
+  "version": "1.0.0",
+  "description": "Backend of ComplAI",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC",
+  "repository": "https://github.com/gosticks/complai",
+  "dependencies": {
+    "body-parser": "^1.20.1",
+    "cors": "^2.8.5",
+    "express": "^4.18.2",
+    "openai": "^3.1.0"
+  }
+}

backend/server.js

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+const express = require('express');
+const cors = require("cors");
+bodyParser = require('body-parser');
+const app = express();
+
+app.use(cors({
+  origin: 'https://complai.de/'
+}));
+ 
+// support parsing of application/json type post data
+app.use(bodyParser.json());
+
+//support parsing of application/x-www-form-urlencoded post data
+app.use(bodyParser.urlencoded({ extended: true }));
+
+app.route("/interpretLaw").post((req, res) => {
+  const {lawtext} = req.body;
+  getResponse(lawtext, res);
+});
+
+app.listen(8543, ()=>{
+    console.log('server is runing at port 8543')
+  });
+
+async function getResponse(lawtext, res) {
+  const { Configuration, OpenAIApi } = require("openai");
+
+  const configuration = new Configuration({
+    apiKey: process.env.OPEN_AI_API_KEY,
+  });
+  const openai = new OpenAIApi(configuration);
+
+  const prompt = "Können Sie zuerst in 1 Wort angeben, welche von diesen Dienstleistungen: [Beratung, Finanzierung, Logistik, Outsourcing, Design, Buchhaltung, Recht, IT, Marketing, Verkauf, Training, Forschung, Wartung, Produktion, Consulting, PR, Support, Recruiting, Coaching, Lieferung.] das folgende Gesetzt betrifft? Dann geben Sie in der nächsten Zeile ausführliche Empfehlungen an Unternehmen, die diese Dienste anbieten, zum Umgang mit diesem Gesetz:\n" + lawtext;
+  console.log("sending to openai: " + prompt);
+
+  try {
+    const response = await openai.createCompletion({
+      model: "text-davinci-003",
+      prompt: prompt + "\n",
+      temperature: 0.2,
+      max_tokens: 1000,
+      top_p: 1,
+      frequency_penalty: 0,
+      presence_penalty: 0
+    });
+
+    console.log("got from openai: " + JSON.stringify(response.data));
+    res.status(200).end(history + response.data.choices[0].text);
+  } catch(error) {
+    console.error(error.response.status, error.response.data);
+    res.status(error.response.status).json(error.response.data);
+  }
+}