84 lines
2.1 KiB
JavaScript
84 lines
2.1 KiB
JavaScript
const express = require("express");
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const QRCode = require("qrcode");
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const app = express();
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const PORT = process.env.PORT || 3000;
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app.use(express.json({ limit: "100kb" }));
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function parseIntWithBounds(value, fallback, min, max) {
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const parsed = Number.parseInt(value, 10);
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if (!Number.isFinite(parsed)) {
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return fallback;
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}
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return Math.min(max, Math.max(min, parsed));
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}
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function normalizePayload(source) {
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const payload = source || {};
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const text = typeof payload.text === "string" ? payload.text.trim() : "";
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if (!text) {
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return {
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error: "Missing required parameter: text",
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};
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}
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return {
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text,
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width: parseIntWithBounds(payload.size, 512, 128, 2048),
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margin: parseIntWithBounds(payload.margin, 2, 0, 10),
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dark: typeof payload.dark === "string" && payload.dark ? payload.dark : "#000000",
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light: typeof payload.light === "string" && payload.light ? payload.light : "#FFFFFF",
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};
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}
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async function sendQrPng(source, res, next) {
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const normalized = normalizePayload(source);
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if (normalized.error) {
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return res.status(400).json({ error: normalized.error });
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}
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try {
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const image = await QRCode.toBuffer(normalized.text, {
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type: "png",
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width: normalized.width,
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margin: normalized.margin,
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color: {
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dark: normalized.dark,
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light: normalized.light,
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},
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});
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res.setHeader("Content-Type", "image/png");
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res.setHeader("Cache-Control", "no-store");
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return res.send(image);
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} catch (error) {
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return next(error);
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}
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}
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app.get("/", (_req, res) => {
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res.json({
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service: "qr-code-api",
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usage: "GET /api/qr?text=hello or POST /api/qr with JSON body { text }",
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});
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});
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app.get("/health", (_req, res) => {
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res.json({ status: "ok" });
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});
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app.get("/api/qr", (req, res, next) => sendQrPng(req.query, res, next));
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app.post("/api/qr", (req, res, next) => sendQrPng(req.body, res, next));
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app.use((err, _req, res, _next) => {
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console.error(err);
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res.status(500).json({ error: "Failed to generate QR code" });
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});
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app.listen(PORT, () => {
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console.log(`QR API listening on port ${PORT}`);
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});
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