Assignments week 2 Ilia Bubnov

.gitignore

@@ -6,5 +6,6 @@ npm-debug.log
 package-lock.json
 yarn-error.log
 *.bkp
+.idea
 
 week3/prep-exercise/server-demo/

assignments/hackyourtemperature/__tests__/app.test.js

@@ -0,0 +1,30 @@
+import { app } from "../app.js";
+import supertest from "supertest";
+
+const request = supertest(app);
+
+describe("POST /weather", () => {
+  it("Should return an error when cityName is not passed", async () => {
+    const response = await request.post("/weather").send({ cityName: "" });
+    expect(response.statusCode).toBe(400);
+    expect(response.text).toBe(
+      '{"weatherText":"You have to fill in city name"}',
+    );
+  });
+  it("Should return an error when cityName is not a city", async () => {
+    const response = await request
+      .post("/weather")
+      .send({ cityName: "jkasdhgjkjasdgf" });
+    expect(response.statusCode).toBe(404);
+    expect(response.text).toBe(
+      '{"weatherText":"Error occurred while fetching data, please check your request"}',
+    );
+  });
+  it("Should successfully fetch data from external API", async () => {
+    const response = await request
+      .post("/weather")
+      .send({ cityName: "Amsterdam" });
+    expect(response.statusCode).toBe(200);
+    expect(response.text).toContain("Amsterdam");
+  });
+});

assignments/hackyourtemperature/app.js

@@ -0,0 +1,19 @@
+import express from "express";
+import { engine } from "express-handlebars";
+import { getWeather } from "./functions.js";
+
+export const app = express();
+
+app.engine("handlebars", engine());
+app.set("view engine", "handlebars");
+app.set("views", "./views");
+
+app.use(express.json());
+
+app.get("/", (req, res) => {
+  //res.render("index");
+  res.send("hello from backend to frontend!");
+});
+app.post("/weather", (req, res) => {
+  getWeather(req, res);
+});

assignments/hackyourtemperature/babel.config.cjs

@@ -0,0 +1,13 @@
+module.exports = {
+  presets: [
+    [
+      // This is a configuration, here we are telling babel what configuration to use
+      "@babel/preset-env",
+      {
+        targets: {
+          node: "current",
+        },
+      },
+    ],
+  ],
+};

assignments/hackyourtemperature/functions.js

@@ -0,0 +1,41 @@
+import { keys } from "./sources/keys.js";
+
+export async function fetcher(url) {
+  const response = await fetch(url);
+  if (!response.ok) {
+    throw response;
+  }
+  return response.json();
+}
+
+export async function getWeather(req, res) {
+  const message = { weatherText: "" };
+  if (!req.body.cityName) {
+    message.weatherText = "You have to fill in city name";
+    return res.status(400).json(message);
+  }
+
+  const { cityName } = req.body;
+  const url = `https://api.openweathermap.org/data/2.5/weather?q=${cityName}&appid=${keys.API_KEY}&units=metric`;
+
+  try {
+    const data = await fetcher(url);
+    const temperature = data.main.temp.toFixed(1);
+    message.weatherText = `${cityName} : ${temperature}°C`;
+    res.json(message);
+  } catch (e) {
+    console.error(
+      `An error occurred while fetching data: ${e.status + e.statusText}`,
+    );
+    if (e.status >= 400 && e.status < 500) {
+      message.weatherText =
+        "Error occurred while fetching data, please check your request";
+      return res.status(e.status).json(message);
+    }
+    if (e.status >= 500) {
+      message.weatherText =
+        "Something went wrong on server side, try again later";
+      return res.status(e.status).json(message);
+    }
+  }
+}

assignments/hackyourtemperature/jest.config.js

@@ -0,0 +1,8 @@
+export default {
+  // Tells jest that any file that has 2 .'s in it and ends with either js or jsx should be run through the babel-jest transformer
+  transform: {
+    "^.+\\.jsx?$": "babel-jest",
+  },
+  // By default our `node_modules` folder is ignored by jest, this tells jest to transform those as well
+  transformIgnorePatterns: [],
+};

assignments/hackyourtemperature/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "hackyourtemperature",
+  "version": "1.0.0",
+  "description": "",
+  "main": "server.js",
+  "scripts": {
+    "test": "jest",
+    "start": "node server.js",
+    "dev": "node --watch server.js",
+    "prettier": "npx prettier . --write"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "express": "^5.1.0",
+    "express-handlebars": "^8.0.3"
+  },
+  "devDependencies": {
+    "@babel/preset-env": "^7.27.1",
+    "babel-jest": "^29.7.0",
+    "jest": "^29.7.0",
+    "prettier": "^3.5.3",
+    "supertest": "^7.1.0"
+  }
+}

assignments/hackyourtemperature/server.js

@@ -0,0 +1,4 @@
+import { app } from "./app.js";
+
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => console.log(`Listening on port ${PORT}`));

assignments/hackyourtemperature/sources/keys.js

@@ -0,0 +1,3 @@
+export const keys = {
+  API_KEY: "532e0f8f80398903f64483df5c48bdc0",
+};

assignments/library-API/books.json

@@ -0,0 +1,32 @@
+[
+  {
+    "id": "asdkjhflaksdhf-asdjkfhglajks",
+    "title": "The Whispering Shadows",
+    "author": "Elena Marquez"
+  },
+  {
+    "id": "iuy23io5u34-43lkj5h234589",
+    "title": "Beneath the Crimson Sky",
+    "author": "Liam O'Connor"
+  },
+  {
+    "id": "jghghruh89ehrgeu9-g34y",
+    "title": "Echoes of Tomorrow",
+    "author": "Priya Desai"
+  },
+  {
+    "id": "4g5u2345837g-hleriuthw",
+    "title": "The Forgotten Orchard",
+    "author": "Sophie Laurent"
+  },
+  {
+    "id": "h75485gkhjgughiu-34783",
+    "title": "Midnight in Avalon",
+    "author": "Jonas Berg"
+  },
+  {
+    "id": "hg4u3gh23io457-g452jh34g5o",
+    "title": "Fragments of Infinity",
+    "author": "Aisha Khan"
+  }
+]

assignments/library-API/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "library-api",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "module",
+  "dependencies": {
+    "express": "^5.1.0"
+  },
+  "devDependencies": {
+    "uuid": "^11.1.0"
+  }
+}

assignments/library-API/server.js

@@ -0,0 +1,59 @@
+import express from 'express';
+import { v4 as uuidv4 } from 'uuid';
+import data from './books.json' with { type: "json" };
+const app = express();
+const PORT = process.env.PORT || 3000;
+
+app.use(express.json());
+app.post('/books', (req, res) => {
+    createBook(req, res);
+})
+app.get('/books', (req, res) => {
+    readBooks(req, res);
+})
+app.put('/books/:id', (req, res) => {
+    updateBook(req, res);
+})
+app.delete('/books/:id', (req, res) => {
+    deleteBook(req, res);
+})
+
+const isInvalid = (req) => {
+    return !req.body || !req.body.title || !req.body.author;
+}
+
+const createBook = (req, res) => {
+    if ( isInvalid(req) ) return res.status(400).send("Invalid request");
+    const id = uuidv4();
+    let newBook = {
+        id: id,
+        title: req.body.title,
+        author: req.body.author,
+    }
+    data.push(newBook);
+    res.status(200).send(id);
+}
+
+const readBooks = (req, res) => {
+    res.setHeader('Content-Type', 'application/json');
+    res.send(data);
+}
+
+const updateBook = (req, res) => {
+    if ( isInvalid(req) ) return res.status(400).send("Invalid request");
+    const id = req.params.id;
+    const bookToUpdate = data.find(book => book.id === id);
+    if (!bookToUpdate) return res.status(404).send("Book Not Found");
+    bookToUpdate.title = req.body.title;
+    bookToUpdate.author = req.body.author;
+    res.send('ok')
+}
+
+const deleteBook = (req, res) => {
+    const id = req.params.id;
+    const bookToDelete = data.find(book => book.id === id);
+    if (!bookToDelete) return res.status(404).send("Book Not Found");
+    data.splice(data.indexOf(bookToDelete), 1);
+}
+
+app.listen(PORT, () => console.log(`Listening on port ${PORT}`));