diff --git a/server.js b/server.js
new file mode 100644
index 0000000..e94c54a
--- /dev/null
+++ b/server.js
@@ -0,0 +1,160 @@
+const crypto = require('crypto');
+const express = require('express');
+const session = require('express-session');
+const { Issuer, generators } = require('openid-client');
+const { Pool } = require('pg');
+
+const app = express();
+const port = Number(process.env.PORT || 3000);
+const appUrl = String(process.env.APP_URL || process.env.COOLIFY_URL || '').replace(/\/$/, '');
+const issuerUrl = process.env.KEYCLOAK_ISSUER;
+const clientId = process.env.KEYCLOAK_CLIENT_ID;
+const clientSecret = process.env.KEYCLOAK_CLIENT_SECRET;
+const databaseUrl = process.env.DATABASE_URL;
+const tenantId = process.env.TENANT_ID || 'shared-demo-tenant';
+const tenantMode = process.env.TENANT_DB_MODE || 'unknown';
+
+for (const [key, value] of Object.entries({ APP_URL: appUrl, KEYCLOAK_ISSUER: issuerUrl, KEYCLOAK_CLIENT_ID: clientId, KEYCLOAK_CLIENT_SECRET: clientSecret, DATABASE_URL: databaseUrl })) {
+ if (!value) throw new Error(`${key} is required`);
+}
+
+const pool = new Pool({ connectionString: databaseUrl });
+let oidcClient;
+const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
+
+async function waitForDatabase() {
+ let lastError;
+ for (let attempt = 1; attempt <= 45; attempt++) {
+ try {
+ await pool.query('SELECT 1');
+ await pool.query(`
+ CREATE TABLE IF NOT EXISTS shared_tenant_visits (
+ id BIGSERIAL PRIMARY KEY,
+ tenant_id TEXT NOT NULL,
+ subject TEXT NOT NULL,
+ username TEXT,
+ visited_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+ )
+ `);
+ await pool.query('CREATE INDEX IF NOT EXISTS idx_shared_tenant_visits_tenant ON shared_tenant_visits (tenant_id)');
+ return;
+ } catch (error) {
+ lastError = error;
+ console.log(`database not ready (attempt ${attempt}/45): ${error.message}`);
+ await sleep(2000);
+ }
+ }
+ throw lastError;
+}
+
+function escapeHtml(value) {
+ return String(value ?? '')
+ .replaceAll('&', '&')
+ .replaceAll('<', '<')
+ .replaceAll('>', '>')
+ .replaceAll('"', '"')
+ .replaceAll("'", ''');
+}
+
+function asyncRoute(fn) {
+ return (req, res, next) => Promise.resolve(fn(req, res, next)).catch(next);
+}
+
+async function main() {
+ await waitForDatabase();
+
+ const issuer = await Issuer.discover(issuerUrl);
+ oidcClient = new issuer.Client({
+ client_id: clientId,
+ client_secret: clientSecret,
+ redirect_uris: [`${appUrl}/callback`],
+ response_types: ['code'],
+ });
+
+ app.set('trust proxy', 1);
+ app.use(session({
+ secret: process.env.SESSION_SECRET || crypto.randomBytes(32).toString('hex'),
+ resave: false,
+ saveUninitialized: false,
+ cookie: { secure: true, httpOnly: true, sameSite: 'lax', maxAge: 8 * 60 * 60 * 1000 },
+ }));
+
+ app.get('/health', asyncRoute(async (_req, res) => {
+ await pool.query('SELECT 1');
+ res.status(200).send('ok');
+ }));
+
+ app.get('/login', (req, res) => {
+ const codeVerifier = generators.codeVerifier();
+ const state = generators.state();
+ req.session.codeVerifier = codeVerifier;
+ req.session.state = state;
+ res.redirect(oidcClient.authorizationUrl({
+ scope: 'openid profile email',
+ code_challenge: generators.codeChallenge(codeVerifier),
+ code_challenge_method: 'S256',
+ state,
+ }));
+ });
+
+ app.get('/callback', asyncRoute(async (req, res) => {
+ const params = oidcClient.callbackParams(req);
+ const tokenSet = await oidcClient.callback(`${appUrl}/callback`, params, {
+ code_verifier: req.session.codeVerifier,
+ state: req.session.state,
+ });
+ req.session.user = tokenSet.claims();
+ delete req.session.codeVerifier;
+ delete req.session.state;
+ res.redirect('/');
+ }));
+
+ app.get('/logout', (req, res) => req.session.destroy(() => res.redirect('/logged-out')));
+ app.get('/logged-out', (_req, res) => res.type('html').send('Signed out
Sign in again
'));
+
+ app.get('/', asyncRoute(async (req, res) => {
+ if (!req.session.user) return res.redirect('/login');
+
+ const user = req.session.user;
+ const username = user.preferred_username || user.email || user.name || user.sub;
+ await pool.query(
+ 'INSERT INTO shared_tenant_visits (tenant_id, subject, username) VALUES ($1, $2, $3)',
+ [tenantId, user.sub, username]
+ );
+
+ const tenantCount = await pool.query('SELECT COUNT(*)::bigint AS count FROM shared_tenant_visits WHERE tenant_id = $1', [tenantId]);
+ const totalCount = await pool.query('SELECT COUNT(*)::bigint AS count FROM shared_tenant_visits');
+ const tenantTotal = await pool.query('SELECT COUNT(DISTINCT tenant_id)::bigint AS count FROM shared_tenant_visits');
+ const lastWrite = await pool.query('SELECT visited_at FROM shared_tenant_visits WHERE tenant_id = $1 ORDER BY id DESC LIMIT 1', [tenantId]);
+
+ res.type('html').send(`
+Arrowstack Shared DB Demo
+
+ Authenticated + shared DB persisted ✅
+ Keycloak authenticated this request, then the app wrote a tenant-scoped row into Arrowstack's shared PostgreSQL database.
+
+ | User | ${escapeHtml(username)} |
+ | Tenant | ${escapeHtml(tenantId)} |
+ | DB mode | ${escapeHtml(tenantMode)} |
+ | This tenant visits | ${escapeHtml(tenantCount.rows[0].count)} |
+ | All shared rows | ${escapeHtml(totalCount.rows[0].count)} |
+ | Distinct tenants in table | ${escapeHtml(tenantTotal.rows[0].count)} |
+ | Last write | ${escapeHtml(lastWrite.rows[0]?.visited_at || '')} |
+ | Keycloak client | ${escapeHtml(clientId)} |
+
+ Record another visit · Local sign out
+`);
+ }));
+
+ app.use((error, _req, res, _next) => {
+ console.error(error);
+ res.status(500).type('text').send('Application error');
+ });
+
+ app.listen(port, '0.0.0.0', () => console.log(`shared-db-keycloak-demo listening on ${port}`));
+}
+
+main().catch((error) => {
+ console.error(error);
+ process.exit(1);
+});