153 lines
4 KiB
JavaScript
Executable file
153 lines
4 KiB
JavaScript
Executable file
// DO NOT CHANGE!
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//init app with express, util, body-parser, csv2json
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const express = require('express');
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const app = express()
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const path = require('path');
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const bodyParser = require('body-parser');
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//register body-parser to handle json from res / req
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app.use(bodyParser.json());
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//register public dir to serve static files (html, css, js)
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app.use(express.static(path.join(__dirname, "public")));
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// END DO NOT CHANGE!
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/**************************************************************************
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****************************** csv2json *********************************
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**************************************************************************/
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const csv = require('csvtojson');
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let csvdata;
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csv()
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.fromFile("world_data.csv")
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.then((jsonObj) => {
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csvdata = jsonObj;
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});
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/**************************************************************************
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********************** handle HTTP METHODS ***********************
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**************************************************************************/
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// ------------------------------ GET ------------------------------
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app.get("/items", function (req, res) {
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res.send(csvdata);
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});
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app.get("/items/:id", function (req, res) {
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const requested_id = parseInt(req.params.id);
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let answer = "Err, No such id " + requested_id + " in database";
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for (let i = 0; i < csvdata.length; i++) {
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if (parseInt(csvdata[i].id) === requested_id) {
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answer = csvdata[i];
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}
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}
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res.send(answer);
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});
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app.get("/items/:id1/:id2", function (req, res) {
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const first_requested_id = parseInt(req.params.id1);
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const second_requested_id = parseInt(req.params.id2);
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let answer = "Err, Range not possible";
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if (id_exists(first_requested_id) && id_exists(second_requested_id)
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&& first_requested_id < second_requested_id) {
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answer = [];
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for (let i = 0; i < csvdata.length; i++) {
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if (parseInt(csvdata[i].id) >= first_requested_id) {
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if (parseInt(csvdata[i].id) <= second_requested_id) {
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answer.push(csvdata[i]);
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}
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}
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}
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}
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res.send(answer);
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});
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app.get("/properties", function (req, res) {
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res.send(Object.keys(csvdata[0]));
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});
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app.get("/properties/:num", function (req, res) {
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let num = parseInt(req.params.num);
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let answer = "Err, No such property available";
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keys = Object.keys(csvdata[0]);
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if (num >= 0 && num < keys.length) {
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answer = keys[num];
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}
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res.send(answer);
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});
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// ----------------------------- POST ------------------------------
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app.post("/items", function (req, res) {
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const new_entry = req.body;
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// set id
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const last_id = parseInt(csvdata[csvdata.length - 1].id);
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new_entry["id"] = (last_id + 1).toString();
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// add entry to csvdata
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csvdata.push(new_entry);
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res.send("Added country " + new_entry.name + " to list!");
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});
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// ---------------------------- DELETE -----------------------------
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app.delete("/items", function (req, res) {
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const name = csvdata[csvdata.length - 1].name;
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csvdata.splice(-1, 1);
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res.send("Deleted last country " + name + "!");
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});
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app.delete("/items/:id", function (req, res) {
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const requested_id = parseInt(req.params.id);
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let answer = "Err, No such id " + requested_id + "in database";
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for (let i = 0; i < csvdata.length; i++) {
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if (parseInt(csvdata[i].id) === requested_id) {
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csvdata.splice(i, 1);
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answer = "Item " + requested_id + " deleted successfully.";
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break;
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}
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}
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res.send(answer);
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});
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// DO NOT CHANGE!
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// bind server to port
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const server = app.listen(3000, function () {
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console.log('Example app listening at http://localhost:3000');
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});
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const id_exists = (id) => {
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for (let i = 0; i < csvdata.length; i++) {
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if (parseInt(csvdata[i].id) === id) {
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return true;
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}
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}
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return false;
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}; |