Create Dockerfile

Dockerfile

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+FROM node:18-alpine
+
+RUN apk add --no-cache git
+
+RUN git clone https://github.com/schlagmichdoch/PairDrop.git /app && \
+    cd /app && npm install
+
+RUN mkdir -p /gw && cd /gw && npm install http-proxy
+
+RUN cat > /gw/gateway.js << 'GWEOF'
+var http = require('http');
+var httpProxy = require('http-proxy');
+var DOMAIN = process.env.DOMAIN || '';
+var proxy = httpProxy.createProxyServer({ target: 'http://127.0.0.1:3001', ws: true });
+proxy.on('error', function(e, req, res) {
+    if (res && res.writeHead) { res.writeHead(502); res.end('502'); }
+});
+function ok(req) {
+    if (!DOMAIN) return true;
+    var h = (req.headers['x-real-domain'] || '') + '|' + (req.headers['x-forwarded-host'] || '') + '|' + (req.headers['host'] || '');
+    return h.indexOf(DOMAIN) !== -1;
+}
+var s = http.createServer(function(req, res) {
+    if (ok(req)) { proxy.web(req, res); } else { res.writeHead(200, {'Content-Type':'text/plain'}); res.end('200 OK'); }
+});
+s.on('upgrade', function(req, socket, head) {
+    if (ok(req)) { proxy.ws(req, socket, head); } else { socket.destroy(); }
+});
+s.listen(7860, function() { console.log('[GW] 7860'); });
+GWEOF
+
+RUN cat > /gw/start.sh << 'SHEOF'
+#!/bin/sh
+cd /app && PORT=3001 node index.js &
+sleep 2
+cd /gw && exec node gateway.js
+SHEOF
+
+RUN chmod +x /gw/start.sh
+
+RUN adduser -D -u 1000 user && \
+    chown -R user:user /app /gw
+
+USER user
+EXPOSE 7860
+CMD ["/gw/start.sh"]