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* Cloudflare DNS Utilities
*
* Zone ID lookup, CNAME record management, and external DNS verification
* via the Cloudflare REST API and DNS-over-HTTPS.
*/
import { BASE_DOMAIN } from "../domain-utils";
export const CF_API_BASE = "https://api.cloudflare.com/client/v4";
const DOH_API = "https://cloudflare-dns.com/dns-query";
export interface CloudflareApiResponse<T = unknown> {
success: boolean;
result: T;
errors: Array<{ code: number; message: string }>;
}
// Cache zone ID for the lifetime of this Worker isolate.
// In Cloudflare Workers, module-level state persists across requests within
// the same isolate. This is intentional — the zone ID for our base domain
// never changes, so caching it avoids redundant API calls on every publish.
let cachedZoneId: string | null = null;
/**
* Look up the Cloudflare zone ID for the base domain.
* Caches the result for the lifetime of the module.
*/
async function getZoneId(apiToken: string): Promise<string | null> {
if (cachedZoneId) return cachedZoneId;
try {
const response = await fetch(
`${CF_API_BASE}/zones?name=${BASE_DOMAIN}&status=active`,
{
headers: { Authorization: `Bearer ${apiToken}` },
},
);
if (!response.ok) {
console.error(
`[DNS] Failed to look up zone for ${BASE_DOMAIN}: ${response.status}`,
);
return null;
}
const data = (await response.json()) as CloudflareApiResponse<
Array<{ id: string; name: string }>
>;
if (!data.result?.length) {
console.error(`[DNS] Zone not found for ${BASE_DOMAIN}`);
return null;
}
cachedZoneId = data.result[0].id;
console.log(`[DNS] Zone ID for ${BASE_DOMAIN}: ${cachedZoneId}`);
return cachedZoneId;
} catch (error) {
console.error(
`[DNS] Error looking up zone: ${error instanceof Error ? error.message : error}`,
);
return null;
}
}
/**
* Ensure a CNAME DNS record exists pointing the custom domain
* to the Pages project's *.pages.dev hostname.
*
* @returns true if the record exists (or was created), false on error
*/
export async function ensureDnsCname(
domain: string,
projectName: string,
apiToken: string,
): Promise<boolean> {
const target = `${projectName}.pages.dev`;
try {
const zoneId = await getZoneId(apiToken);
if (!zoneId) return false;
// Check if CNAME already exists
const listResponse = await fetch(
`${CF_API_BASE}/zones/${zoneId}/dns_records?type=CNAME&name=${domain}`,
{
headers: { Authorization: `Bearer ${apiToken}` },
},
);
if (listResponse.ok) {
const listData = (await listResponse.json()) as CloudflareApiResponse<
Array<{ id: string; name: string; content: string }>
>;
const existing = listData.result || [];
if (existing.some((r) => r.name === domain && r.content === target)) {
console.log(`[DNS] CNAME already exists: ${domain} → ${target}`);
return true;
}
// If a CNAME exists but points elsewhere, update it
const staleRecord = existing.find((r) => r.name === domain);
if (staleRecord) {
console.log(
`[DNS] Updating CNAME ${domain}: ${staleRecord.content} → ${target}`,
);
const updateResponse = await fetch(
`${CF_API_BASE}/zones/${zoneId}/dns_records/${staleRecord.id}`,
{
method: "PATCH",
headers: {
Authorization: `Bearer ${apiToken}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
type: "CNAME",
name: domain,
content: target,
proxied: true,
}),
},
);
if (updateResponse.ok) {
console.log(`[DNS] Updated CNAME: ${domain} → ${target}`);
return true;
}
const errData =
(await updateResponse.json()) as CloudflareApiResponse;
console.error(
`[DNS] Failed to update CNAME: ${JSON.stringify(errData.errors)}`,
);
return false;
}
}
// Create new CNAME record
console.log(`[DNS] Creating CNAME: ${domain} → ${target}`);
const createResponse = await fetch(
`${CF_API_BASE}/zones/${zoneId}/dns_records`,
{
method: "POST",
headers: {
Authorization: `Bearer ${apiToken}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
type: "CNAME",
name: domain,
content: target,
proxied: true,
}),
},
);
if (createResponse.ok) {
console.log(`[DNS] Created CNAME: ${domain} → ${target}`);
return true;
}
const errorData = (await createResponse.json()) as CloudflareApiResponse;
const errorStr = JSON.stringify(errorData.errors);
if (errorStr.includes("already exists")) {
console.log(`[DNS] CNAME already exists (race): ${domain}`);
return true;
}
console.error(`[DNS] Failed to create CNAME for ${domain}: ${errorStr}`);
return false;
} catch (error) {
console.error(
`[DNS] Error ensuring CNAME for ${domain}: ${error instanceof Error ? error.message : error}`,
);
return false;
}
}
/**
* Verify that an external domain's CNAME record points to the expected
* *.pages.dev target using Cloudflare's DNS-over-HTTPS API.
*
* Works from Workers (no Node `dns` module needed).
*/
export async function verifyExternalDnsCname(
domain: string,
expectedTarget: string,
): Promise<{ verified: boolean; resolvedTarget?: string; error?: string }> {
try {
const response = await fetch(
`${DOH_API}?name=${encodeURIComponent(domain)}&type=CNAME`,
{
headers: { Accept: "application/dns-json" },
},
);
if (!response.ok) {
return { verified: false, error: `DNS query failed: ${response.status}` };
}
const data = (await response.json()) as {
Status: number;
Answer?: Array<{ type: number; data: string }>;
};
if (data.Status !== 0) {
return {
verified: false,
error: `DNS query returned status ${data.Status}`,
};
}
if (!data.Answer?.length) {
return { verified: false, error: "No CNAME record found" };
}
// Type 5 = CNAME record
const cnameRecord = data.Answer.find((a) => a.type === 5);
if (!cnameRecord) {
return { verified: false, error: "No CNAME record found" };
}
// Normalize: strip trailing dot and compare case-insensitively
const resolved = cnameRecord.data.replace(/\.$/, "").toLowerCase();
const expected = expectedTarget.replace(/\.$/, "").toLowerCase();
if (resolved === expected) {
return { verified: true, resolvedTarget: resolved };
}
return {
verified: false,
resolvedTarget: resolved,
error: `CNAME points to ${resolved}, expected ${expected}`,
};
} catch (error) {
return {
verified: false,
error: `DNS verification failed: ${error instanceof Error ? error.message : error}`,
};
}
}
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