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A guide to self-host your app on your local hardware (e.g. Raspberry Pi) with custom domain and SSL pi.arjunkrishna.dev
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const API_TOKEN = process.env.CLOUDFLARE_API_TOKEN;const ZONE_ID = process.env.CLOUDFLARE_ZONE_ID;const RECORD_NAME = process.env.CF_DNS_RECORD_NAME;const ZONE_NAME = process.env.CLOUDFLARE_ZONE_NAME;const STATE_FILE = path.join('/tmp', 'cf-dns-last-ip');
function logErr(msg) { console.error(`${new Date().toISOString()} ${msg}`);}
async function getPublicIP() { const urls = ['https://api.ipify.org', 'https://icanhazip.com']; for (const url of urls) { try { const res = await fetch(url, { signal: AbortSignal.timeout(10000) }); if (res.ok) { const ip = (await res.text()).trim(); if (ip && /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(ip)) return ip; } } catch (_) {} } return null;}
async function main() { if (!API_TOKEN) { logErr('Set CLOUDFLARE_API_TOKEN'); process.exit(1); }
const currentIP = await getPublicIP(); if (!currentIP) { logErr('Failed to get public IP'); process.exit(1); }
if (fs.existsSync(STATE_FILE)) { try { const lastIP = fs.readFileSync(STATE_FILE, 'utf8').trim(); if (lastIP === currentIP) process.exit(0); } catch (_) {} }
const { default: Cloudflare } = await import('cloudflare'); const client = new Cloudflare({ apiToken: API_TOKEN });
let zoneId = ZONE_ID; if (!zoneId) { const zones = await client.zones.list({ name: ZONE_NAME }); const zone = zones.result?.[0]; if (!zone?.id) { logErr(`Could not get Zone ID for ${ZONE_NAME}`); process.exit(1); } zoneId = zone.id; }
const fullName = `${RECORD_NAME}.${ZONE_NAME}`; const list = await client.dns.records.list({ zone_id: zoneId, type: 'A', name: fullName, }); const record = list.result?.[0]; const existingIP = record?.content;
if (record && existingIP === currentIP) { fs.writeFileSync(STATE_FILE, currentIP); process.exit(0); }
const body = { type: 'A', name: RECORD_NAME, content: currentIP, proxied: true, ttl: 1, };
try { if (record?.id) { await client.dns.records.edit(record.id, { zone_id: zoneId, ...body, }); } else { await client.dns.records.create({ zone_id: zoneId, ...body, }); } } catch (err) { logErr(`Cloudflare API error: ${err.message}`); process.exit(1); }
fs.writeFileSync(STATE_FILE, currentIP); console.log(`${new Date().toISOString()} Updated ${fullName} to ${currentIP}`);}
main();