wbs_rechner/backend_nodejs/wbs_rechner_express.js

const express = require('express');
const app = express();
const expressSwagger = require('express-swagger-generator')(app);
app.use(express.json()); //für das Parsing von JSON-Daten

let options = {
    swaggerDefinition: {
        info: {
            description: 'API Dokumentation',
            title: 'WBS API',
            version: '1.0.0',
        },
        host: 'localhost:3000',
        basePath: '/',
        produces: [
            "application/json"
        ],
        schemes: ['http', 'https']
    },
    basedir: __dirname,
    files: ['./**/*.js']
};
expressSwagger(options)

/**
 * @typedef Income
 * @property {string} type.required
 * @property {number} amount.required
 * @property {string} frequency.required - monthly / quarterly / yearly
 * @property {number} advertisingCosts.required
 */

/**
 * @typedef Person
 * @property {string} name.required
 * @property {Array.<Income>} incomes.required
 */

/**
 * @typedef Frequency
 * @property {string} id.required
 * @property {string} description.required
 */


/**
 * @route POST /calculate
 * @group Einkommen - Operationen für Einkommen
 * @param {Income.model} incomes.body.required - eine neue Person
 * @returns {object} 200 - Eine Person hinzufügen
 * @returns {Error}  default - Unerwarteter Fehler
 */
app.post('/calculate', (req, res) => {
    let totalIncome = 0;
    const persons = req.body;
    for (const person of persons) {
        for (const income of person.incomes) {
        let annualIncome = income.amount * income.frequency;
        annualIncome -= income.advertisingCosts;
        totalIncome += annualIncome;
    }
    }

    //Beispiel Berechnung nicht entsprechend der WBS Berechnung
    let maxIncome = persons.length * 12000;
    let wbsGranted = maxIncome <= totalIncome;

    res.send({ wbsGranted: wbsGranted });
});

/**
 * @route GET /frequencies
 * @group Einkommen - Operationen für Einkommen
 * @returns {Array.<Frequency>} 200 - Eine Liste der Frequenzen abrufen
 * @returns {Error}  default - Unerwarteter Fehler
 */
app.get('/frequencies', (req, res) => {
    const frequencies = [
        { value: 365, description: 'täglich' },
        { value: 12, description: 'monatlich' },
        { value: 4, description: 'vierteljährlich' },
        { value: 1, description: 'jährlich' }
        //usw...
    ];
    res.send(frequencies);
});


/**
 * @route GET /types
 * @group Einkommen - Operationen für Einkommen
 * @returns {Array.<IncomeType>} 200 - Eine Liste der Einkommensarten
 * @returns {Error}  default - Unerwarteter Fehler
 */
app.get('/types', (req, res) => {
    const types = [
        { value: 'work', description: 'als Arbeitnehmer' },
        { value: 'pensioner', description: 'als Rentner' },
        { value: 'social', description: 'Einnahme aus Sozialeistungen' },
        { value: 'entertains', description: 'Unterhalt' }
        //usw...
    ];
    res.send(frequencies);
});

const port = process.env.PORT || 3000;
app.listen(port, () => console.log(`Server läuft auf Port ${port}...`));