root
31 lines
717 B
TypeScript
31 lines
717 B
TypeScript
export const RESERVED_SUBDOMAINS = new Set([
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'app',
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'api',
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'www',
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'admin',
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'auth',
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'mail',
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'static',
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]);
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const SUBDOMAIN_RE = /^[a-z0-9-]{3,32}$/;
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export function validateSubdomain(input: unknown):
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| { ok: true; value: string }
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| { ok: false; error: string } {
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if (typeof input !== 'string') {
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return { ok: false, error: 'subdomain must be a string' };
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}
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const value = input.trim().toLowerCase();
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if (!SUBDOMAIN_RE.test(value)) {
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return {
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ok: false,
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error: 'subdomain must be 3–32 chars, lowercase a–z, 0–9, hyphen',
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};
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}
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if (RESERVED_SUBDOMAINS.has(value)) {
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return { ok: false, error: `'${value}' is reserved` };
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}
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return { ok: true, value };
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}
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