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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 2026 odweta
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) 2026 odweta
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
README.md
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# Fakturovac
A simple app for creating and managing invoices
To deploy, run:
```
make rebuild
```
TODO
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app/Dockerfile
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FROM node:latest
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci
COPY . .
CMD ["npm", "run", "serve"]
EXPOSE 3001
app/Makefile
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TAG := fakturovac
.PHONY: build, run, test, preview
build:
docker compose build
test:
npm test
run:
docker compose up --remove-orphans
rund:
docker compose up -d --remove-orphans
kill:
docker compose -p $(TAG) down
build-and-run: build run
test-and-run: test run
deploy: kill build test rund
deploy-no-kill: build test rund
app/docker-compose.yml
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name: fakturovac
services:
app:
build: .
ports:
- "3001:3001"
app/package-lock.json
Generated
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app/package.json
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{
"name": "Fakturovac",
"version": "1.0.0",
"description": "A simple app for creating and managing invoices.",
"type": "commonjs",
"main": "src/server.js",
"scripts": {
"test": "jest --runInBand",
"test:watch": "jest --watch",
"serve": "node src/server.js"
},
"dependencies": {
"express": "5.2.1",
"node-fetch": "3.3.2",
"pg": "^8.11.3"
},
"devDependencies": {
"jest": "30.5.1",
"supertest": "7.2.2"
}
}
app/src/app.js
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const express = require('express');
const path = require('path');
const app = express();
// specifying the folder with the static content - html+css
app.use(express.static(__dirname + '/static'));
app.get('/', (req, res) => {
res.sendFile(path.join(__dirname, '/static/index.html'));
});
module.exports = app;
app/src/server.js
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const app = require('./app');
const port = 3001;
app.listen(port, () => {
console.log(`App listening on port ${port}`);
});
app/src/static/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css" />
<title>Fakturovač</title>
</head>
<body>
<main id="main-container">
<div>
<form id="main-form">
<h2>Fakturovač</h2>
<!--
ico
jmeno
prijmeni
ulice, c.p.
psc
mesto
^^^ x2 - dodavatel, odberatel
----------
cislo uctu
iban
swift
----------
polozky
+ popis
+ mnozstvi
+ merna jednotka MJ
+ cena za MJ
----------
total soucet
-->
<div class="form-chapter supplier-customer-section">
<div id="dodavatelWrapper" class="form-part">
<h3>Dodavatel</h3>
<div class="form-group">
<label for="dodavatelIco">IČO</label>
<input id="dodavatelIco" name="dodavatelIco" />
</div>
<div class="form-group">
<label for="dodavatelJmeno">Jméno</label>
<input id="dodavatelJmeno" name="dodavatelJmeno" />
</div>
<div class="form-group">
<label for="dodavatelPrijmeni">Příjmení</label>
<input id="dodavatelPrijmeni" name="dodavatelPrijmeni" />
</div>
<div class="form-group">
<label for="dodavatelUliceCp">Ulice a číslo popisné</label>
<input id="dodavatelUliceCp" name="dodavatelUliceCp" />
</div>
<div class="form-group">
<label for="dodavatelPsc">PSČ</label>
<input id="dodavatelPsc" name="dodavatelPsc" />
</div>
<div class="form-group">
<label for="dodavatelMesto">Město</label>
<input id="dodavatelMesto" name="dodavatelMesto" />
</div>
</div>
<div id="odberatelWrapper" class="form-part">
<h3>Odběratel</h3>
<div class="form-group">
<label for="odberatelIco">IČO</label>
<input id="odberatelIco" name="odberatelIco" />
</div>
<div class="form-group">
<label for="odberatelJmeno">Jméno</label>
<input id="odberatelJmeno" name="odberatelJmeno" />
</div>
<div class="form-group">
<label for="odberatelPrijmeni">Příjmení</label>
<input id="odberatelPrijmeni" name="odberatelPrijmeni" />
</div>
<div class="form-group">
<label for="odberatelUliceCp">Ulice a číslo popisné</label>
<input id="odberatelUliceCp" name="odberatelUliceCp" />
</div>
<div class="form-group">
<label for="odberatelPsc">PSČ</label>
<input id="odberatelPsc" name="odberatelPsc" />
</div>
<div class="form-group">
<label for="odberatelMesto">Město</label>
<input id="odberatelMesto" name="odberatelMesto" />
</div>
</div>
</div>
<div class="form-chapter second-row">
<div class="form-part">
<button type="button" id="addItemButton">Přidat položku</button>
<div id="itemsContainer"></div>
</div>
</div>
<div class="form-chapter third-row">
<div class="form-part">
<div class="form-group">
<label for="cisloUctu">Číslo účtu</label>
<input id="cisloUctu" name="cisloUctu" />
</div>
<div class="form-group">
<label for="iban">IBAN</label>
<input id="iban" name="iban" />
</div>
<div class="form-group">
<label for="swift">SWIFT</label>
<input id="swift" name="swift" />
</div>
</div>
<div class="form-group">
<label for="total">Celková částka</label>
<output id="total" name="total">0.00</output>
</div>
</div>
<button type="button" id="printInvoiceButton">
Vygenerovat a vytisknout fakturu
</button>
</form>
</div>
</main>
<script src="script.js"></script>
</body>
</html>
app/src/static/script.js
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const addItemButton = document.getElementById("addItemButton");
const itemsContainer = document.getElementById("itemsContainer");
const printInvoiceButton = document.getElementById("printInvoiceButton");
let itemIndex = 0;
const escapeHtml = (value) => String(value ?? "")
.replace(/&/g, "&amp;")
.replace(/</g, "&lt;")
.replace(/>/g, "&gt;")
.replace(/"/g, "&quot;")
.replace(/'/g, "&#039;");
const getValue = (id) => {
const field = document.getElementById(id);
return ("value" in field ? field.value : field.textContent).trim();
};
const updateTotal = () => {
const total = Array.from(itemsContainer.querySelectorAll(".invoice-item"))
.reduce((sum, item) => {
const quantity = Number(item.querySelector('[name$="[mnozstvi]"]').value) || 0;
const unitPrice = Number(item.querySelector('[name$="[cenaZaMj]"]').value) || 0;
return sum + quantity * unitPrice;
}, 0);
document.getElementById("total").textContent = total.toFixed(2);
};
const getPersonName = (prefix) => [
getValue(`${prefix}Jmeno`),
getValue(`${prefix}Prijmeni`)
].filter(Boolean).join(" ");
const getAddress = (prefix) => [
getValue(`${prefix}UliceCp`),
[getValue(`${prefix}Psc`), getValue(`${prefix}Mesto`)].filter(Boolean).join(" ")
].filter(Boolean).join(", ");
const renderPerson = (prefix) => [
getPersonName(prefix),
getValue(`${prefix}Ico`) ? `IČO: ${getValue(`${prefix}Ico`)}` : "",
getAddress(prefix)
].filter(Boolean).map(escapeHtml).join("<br>");
const renderItems = () => Array.from(itemsContainer.querySelectorAll(".invoice-item"))
.map((item) => {
const values = Array.from(item.querySelectorAll("input")).map((input) => input.value.trim());
return `<tr class="invoice-row">
<td>${escapeHtml(values[0])}</td>
<td>${escapeHtml(values[1])}</td>
<td>${escapeHtml(values[2])}</td>
<td>${escapeHtml(values[3])}</td>
</tr>`;
}).join("");
const normalizeIban = (value) => value.replace(/\s+/g, "").toUpperCase();
const domesticAccountToIban = (accountNumber) => {
const match = accountNumber.replace(/\s+/g, "")
.match(/^(?:(\d{1,6})-)?(\d{1,10})\/(\d{4})$/);
if (!match) {
return "";
}
const bban = `${match[3]}${(match[1] || "").padStart(6, "0")}${match[2].padStart(10, "0")}`;
const remainder = `${bban}123500`.split("").reduce(
(value, digit) => (value * 10 + Number(digit)) % 97,
0
);
const checkDigits = String(98 - remainder).padStart(2, "0");
return `CZ${checkDigits}${bban}`;
};
const buildPaymentQrPayload = (accountNumber, iban, swift, total) => {
const preferredAccount = normalizeIban(accountNumber);
const fallbackAccount = normalizeIban(iban);
const paymentAccount = /^([A-Z]{2})\d{2}[A-Z0-9]{10,32}$/.test(preferredAccount)
? preferredAccount
: domesticAccountToIban(accountNumber) || fallbackAccount;
if (!/^([A-Z]{2})\d{2}[A-Z0-9]{10,32}$/.test(paymentAccount)) {
return "";
}
return [
"SPD*1.0",
`ACC:${paymentAccount}`,
`AM:${Number(total || 0).toFixed(2)}`,
"CC:CZK",
swift && `X-SWIFT:${normalizeIban(swift)}`
].filter(Boolean).join("*");
};
const buildInvoiceHtml = () => {
const accountNumber = getValue("cisloUctu");
const iban = getValue("iban");
const swift = getValue("swift");
const qrPayload = buildPaymentQrPayload(
accountNumber,
iban,
swift,
getValue("total")
);
const qrMarkup = qrPayload
? `<img class="qr-code" src="https://api.qrserver.com/v1/create-qr-code/?size=220x220&amp;data=${encodeURIComponent(qrPayload)}" alt="QR kód platebních údajů">`
: "<p>Platební QR kód vyžaduje platný IBAN. Číslo účtu bez IBANu nelze bezpečně převést.</p>";
const paymentDetails = [
accountNumber && `Číslo účtu: ${accountNumber}`,
iban && `IBAN: ${iban}`,
swift && `SWIFT: ${swift}`
].filter(Boolean).map(escapeHtml).join("<br>");
return `<!DOCTYPE html>
<html lang="cs">
<head>
<meta charset="UTF-8">
<title>Faktura</title>
<style>
@page { size: A4; margin: 18mm; }
* { box-sizing: border-box; }
body { color: #202124; font: 14px Arial, sans-serif; margin: 0; }
h1 { font-size: 30px; margin: 0 0 28px; }
h2 { font-size: 16px; margin: 0 0 8px; }
.parties { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-bottom: 28px; }
.party, .payment { border-top: 2px solid #202124; padding-top: 10px; }
table { border-collapse: separate; border-spacing: 0; margin-top: 24px; width: 100%; }
th, td { padding: 9px 6px; text-align: left; }
th { background: #f1f1f1; border-bottom: 1px solid #aeb8c0; }
.invoice-row td { border-bottom: 1px solid #c8c8c8; }
.invoice-row:nth-child(even) { background: #f4f7fb; }
.total { font-size: 18px; font-weight: bold; margin-top: 22px; text-align: right; }
.payment-row { align-items: start; display: flex; gap: 28px; justify-content: space-between; margin-top: 36px; }
.qr-code { height: 180px; width: 180px; }
.qr-placeholder { color: #666; max-width: 220px; }
@media print { .qr-placeholder { color: #202124; } }
</style>
</head>
<body>
<h1>Faktura</h1>
<div class="parties">
<section class="party"><h2>Dodavatel</h2>${renderPerson("dodavatel") || "Neuvedeno"}</section>
<section class="party"><h2>Odběratel</h2>${renderPerson("odberatel") || "Neuvedeno"}</section>
</div>
<table>
<thead><tr><th>Popis</th><th>Množství</th><th>MJ</th><th>Cena za MJ</th></tr></thead>
<tbody>${renderItems() || "<tr><td colspan=\"4\">Žádné položky</td></tr>"}</tbody>
</table>
<p class="total">Celková částka: ${escapeHtml(getValue("total")) || "0"}</p>
<div class="payment-row">
<section class="payment"><h2>Platební údaje</h2>${paymentDetails || "Neuvedeno"}</section>
<div class="qr-placeholder">${qrMarkup}</div>
</div>
</body>
</html>`;
};
printInvoiceButton.addEventListener("click", () => {
const printWindow = window.open("about:blank", "_blank");
if (!printWindow) {
window.alert("Povolte prosím vyskakovací okna pro tisk faktury.");
return;
}
printWindow.document.open();
printWindow.document.write(buildInvoiceHtml());
printWindow.document.close();
printWindow.addEventListener("load", () => printWindow.print(), { once: true });
});
addItemButton.addEventListener("click", () => {
itemIndex++;
const item = document.createElement("div");
item.classList.add("invoice-item");
item.innerHTML = `
<div class="form-group">
<label for="polozka${itemIndex}Popis">Popis</label>
<input
id="polozka${itemIndex}Popis"
name="polozky[${itemIndex}][popis]"
type="text"
/>
</div>
<div class="form-group">
<label for="polozka${itemIndex}Mnozstvi">Množství</label>
<input
id="polozka${itemIndex}Mnozstvi"
name="polozky[${itemIndex}][mnozstvi]"
type="number"
min="0"
step="0.01"
/>
</div>
<div class="form-group">
<label for="polozka${itemIndex}MernaJednotka">
Měrná jednotka
</label>
<input
id="polozka${itemIndex}MernaJednotka"
name="polozky[${itemIndex}][mernaJednotka]"
type="text"
placeholder="ks"
/>
</div>
<div class="form-group">
<label for="polozka${itemIndex}CenaZaMj">
Cena za MJ
</label>
<input
id="polozka${itemIndex}CenaZaMj"
name="polozky[${itemIndex}][cenaZaMj]"
type="number"
min="0"
step="0.01"
/>
</div>
<button
type="button"
class="delete-item-button"
aria-label="Smazat položku"
title="Smazat položku"
>
<svg
xmlns="http://www.w3.org/2000/svg"
width="18"
height="18"
viewBox="0 0 24 24"
fill="none"
stroke="currentColor"
stroke-width="2"
stroke-linecap="round"
stroke-linejoin="round"
aria-hidden="true"
>
<path d="M3 6h18"></path>
<path d="M8 6V4h8v2"></path>
<path d="M19 6l-1 14H6L5 6"></path>
<path d="M10 11v5"></path>
<path d="M14 11v5"></path>
</svg>
</button>
`;
const deleteButton = item.querySelector(".delete-item-button");
deleteButton.addEventListener("click", () => {
item.remove();
updateTotal();
});
itemsContainer.appendChild(item);
updateTotal();
});
itemsContainer.addEventListener("input", updateTotal);
app/src/static/style.css
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:root {
--ink: #17202a;
--muted-ink: #65717d;
--navy: #183b56;
--blue: #2b6f8f;
--paper: #fffdf8;
--cream: #f5efe5;
--line: #d8d4cc;
--shadow: 0 18px 45px rgba(33, 48, 61, 0.12);
}
* {
box-sizing: border-box;
}
body {
min-height: 100vh;
margin: 0;
padding: 3rem 1.25rem;
color: var(--ink);
background: linear-gradient(135deg, #e9f1f3 0%, #f7f2e9 52%, #e7edf1 100%);
font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}
#main-container {
width: min(100%, 980px);
margin: 0 auto;
padding: 2.5rem clamp(1.25rem, 4vw, 4rem);
background: var(--paper);
border: 1px solid rgba(24, 59, 86, 0.12);
box-shadow: var(--shadow);
}
#main-form {
display: flex;
flex-direction: column;
align-items: center;
gap: 2rem;
}
#main-form > h2 {
width: 100%;
margin: 0;
color: var(--navy);
font-family: Georgia, serif;
font-size: clamp(2rem, 5vw, 3.5rem);
font-weight: 500;
letter-spacing: 0.02em;
text-align: center;
}
.form-chapter {
display: flex;
flex-direction: row;
gap: 2rem;
width: 100%;
max-width: 820px;
}
.form-chapter:not(.supplier-customer-section) {
padding-top: 1.5rem;
border-top: 1px solid var(--line);
}
.form-part {
display: flex;
flex-direction: column;
flex: 1;
}
.form-group {
display: flex;
flex-direction: column;
margin-bottom: 1rem;
}
.form-group label {
margin-bottom: 0.25rem;
color: var(--muted-ink);
font-size: 0.78rem;
font-weight: 700;
letter-spacing: 0.07em;
text-transform: uppercase;
}
.form-group input {
width: 100%;
padding: 0.65rem 0.7rem;
color: var(--ink);
background: #fff;
border: 1px solid #c8d0d5;
border-radius: 0.25rem;
font: inherit;
}
.form-group input:focus {
border-color: var(--blue);
outline: 2px solid rgba(43, 111, 143, 0.18);
outline-offset: 1px;
}
.form-group output {
min-height: 1.5rem;
padding: 0.25rem 0;
color: var(--navy);
font-family: Georgia, serif;
font-size: 1.5rem;
font-weight: 700;
}
.second-row {
align-items: flex-start;
}
.second-row > .form-part,
.second-row > .form-group {
flex: 1;
}
.third-row {
align-items: flex-start;
}
.third-row > .form-part,
.third-row > .form-group {
flex: 1;
}
.supplier-customer-section {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
column-gap: 2rem;
width: 100%;
max-width: 820px;
}
.supplier-customer-section > h2 {
grid-column: 1 / -1;
margin: 0 0 1.5rem;
text-align: center;
}
.form-part h3 {
margin-top: 0;
color: var(--navy);
font-family: Georgia, serif;
font-size: 1.35rem;
font-weight: 500;
}
#itemsContainer {
width: 100%;
}
.invoice-item {
display: grid;
grid-template-columns: 2fr 1fr 1fr 1fr auto;
align-items: end;
gap: 1rem;
width: 100%;
margin-top: 1.5rem;
padding: 1rem;
border: 1px solid var(--line);
border-radius: 0.25rem;
box-shadow: 0 3px 10px rgba(33, 48, 61, 0.04);
}
.invoice-item:nth-child(even) {
background: #f4f7fb;
}
.invoice-item:nth-child(odd) {
background: #fffaf0;
}
.invoice-item .form-group {
margin-bottom: 0;
}
.invoice-item input {
width: 100%;
}
.delete-item-button {
display: flex;
align-items: center;
justify-content: center;
width: 2.25rem;
height: 2.25rem;
padding: 0;
color: #a53c36;
background: transparent;
border: 1px solid #c47a72;
border-radius: 0.25rem;
cursor: pointer;
}
.delete-item-button:hover {
color: white;
background-color: #a53c36;
}
.delete-item-button:focus-visible {
outline: 2px solid #2563eb;
outline-offset: 2px;
}
#printInvoiceButton {
align-self: center;
color: #fff;
background: var(--navy);
border: 0;
border-radius: 0.25rem;
cursor: pointer;
font: inherit;
font-weight: 700;
padding: 0.75rem 1rem;
transition: background-color 160ms ease, transform 160ms ease;
}
#printInvoiceButton:hover {
background: var(--blue);
transform: translateY(-1px);
}
#addItemButton {
align-self: flex-start;
color: var(--navy);
background: transparent;
border: 1px solid var(--blue);
border-radius: 0.25rem;
cursor: pointer;
font: inherit;
font-weight: 700;
padding: 0.6rem 0.85rem;
}
#addItemButton:hover {
color: #fff;
background: var(--blue);
}
@media (max-width: 700px) {
body {
padding: 1rem 0.5rem;
}
#main-container {
padding: 1.5rem 1rem;
}
.supplier-customer-section {
grid-template-columns: 1fr;
row-gap: 1rem;
}
.invoice-item {
grid-template-columns: 1fr;
}
.delete-item-button {
justify-self: end;
}
}
app/test/app.test.js
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// const request = require("supertest");
// const app = require("../src/app");
// describe("GET /search", () => {
// afterEach(() => {
// jest.restoreAllMocks();
// });
// test("returns 400 when query is missing", async () => {
// const response = await request(app).get("/search");
// expect(response.status).toBe(400);
// expect(response.text).toBe("Missing search query");
// });
// test("returns filtered search results", async () => {
// global.fetch = jest.fn().mockResolvedValue({
// json: jest.fn().mockResolvedValue({
// results: [
// {
// url: "https://example.com",
// title: "Example",
// content: "Content",
// irrelevant: "removed"
// }
// ]
// })
// });
// const response = await request(app)
// .get("/search")
// .query({ query: "nodejs" });
// expect(response.status).toBe(200);
// expect(response.headers["content-type"]).toMatch(/application\/json/);
// expect(response.headers["content-disposition"]).toContain(
// 'attachment; filename="output.json"'
// );
// expect(response.body).toEqual([
// {
// url: "https://example.com",
// title: "Example",
// content: "Content"
// }
// ]);
// });
// });