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* Preview Token Utilities
*
* Generates and validates self-signed preview tokens using HMAC.
* Tokens are stateless - no database storage required.
*
* Token format: base64(JSON({subdomain, proId, exp})).signature
*/
// Reserved subdomains that pros cannot use
export const RESERVED_SUBDOMAINS = new Set([
// Infrastructure
"www",
"api",
"app",
"admin",
"portal",
"dashboard",
"console",
"panel",
// Email/Communication
"mail",
"email",
"smtp",
"imap",
"pop",
"webmail",
// Security/Auth
"auth",
"login",
"signin",
"signup",
"register",
"account",
"oauth",
"sso",
// Common services
"ftp",
"sftp",
"cdn",
"static",
"assets",
"images",
"media",
"files",
"download",
"upload",
// Development/Testing
"dev",
"test",
"staging",
"preview",
"demo",
"sandbox",
"beta",
"alpha",
// Support
"help",
"support",
"docs",
"documentation",
"status",
"blog",
"news",
// Platform specific
"decorrocket",
"decor-rocket",
"interioring",
"marketplace",
"pro",
"pros",
"vendor",
"vendors",
"internal",
"system",
"root",
"null",
"undefined",
// DNS/Network
"ns",
"ns1",
"ns2",
"mx",
"autodiscover",
"autoconfig",
"_dmarc",
"_domainkey",
]);
interface PreviewTokenPayload {
sub: string; // subdomain
vid: string; // proId
uid: string; // userId who generated the token
exp: number; // expiration timestamp (seconds)
}
/**
* Create a signed preview token
* Uses HMAC-SHA256 for signing
*/
export async function createPreviewToken(
subdomain: string,
proId: string,
userId: string,
secret: string,
expiresInMinutes = 30,
): Promise<{ token: string; expiresAt: Date }> {
const expiresAt = new Date(Date.now() + expiresInMinutes * 60 * 1000);
const payload: PreviewTokenPayload = {
sub: subdomain,
vid: proId,
uid: userId,
exp: Math.floor(expiresAt.getTime() / 1000),
};
// Encode payload as base64
const payloadStr = JSON.stringify(payload);
const payloadB64 = btoa(payloadStr);
// Sign with HMAC-SHA256
const encoder = new TextEncoder();
const key = await crypto.subtle.importKey(
"raw",
encoder.encode(secret),
{ name: "HMAC", hash: "SHA-256" },
false,
["sign"],
);
const signature = await crypto.subtle.sign(
"HMAC",
key,
encoder.encode(payloadB64),
);
// Convert signature to base64url (URL-safe)
const sigB64 = btoa(String.fromCharCode(...new Uint8Array(signature)))
.replace(/\+/g, "-")
.replace(/\//g, "_")
.replace(/=+$/, "");
// Token format: payload.signature
const token = `${payloadB64}.${sigB64}`;
return { token, expiresAt };
}
/**
* Validate a preview token
* Returns the payload if valid, null if invalid
*/
export async function validatePreviewToken(
token: string,
secret: string,
): Promise<PreviewTokenPayload | null> {
try {
const [payloadB64, sigB64] = token.split(".");
if (!payloadB64 || !sigB64) {
return null;
}
// Verify signature
const encoder = new TextEncoder();
const key = await crypto.subtle.importKey(
"raw",
encoder.encode(secret),
{ name: "HMAC", hash: "SHA-256" },
false,
["verify"],
);
// Convert base64url back to regular base64
const sigB64Normal = sigB64.replace(/-/g, "+").replace(/_/g, "/");
const sigPadded =
sigB64Normal + "=".repeat((4 - (sigB64Normal.length % 4)) % 4);
const sigBytes = Uint8Array.from(atob(sigPadded), (c) => c.charCodeAt(0));
const isValid = await crypto.subtle.verify(
"HMAC",
key,
sigBytes,
encoder.encode(payloadB64),
);
if (!isValid) {
return null;
}
// Decode and validate payload
const payloadStr = atob(payloadB64);
const payload = JSON.parse(payloadStr) as PreviewTokenPayload;
// Check expiration
if (payload.exp < Math.floor(Date.now() / 1000)) {
return null;
}
return payload;
} catch {
return null;
}
}
/**
* Check if a subdomain is reserved
*/
export function isReservedSubdomain(subdomain: string): boolean {
return RESERVED_SUBDOMAINS.has(subdomain.toLowerCase());
}
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