Jon Staab
25 lines
769 B
TypeScript
25 lines
769 B
TypeScript
export const RELAY_DOMAIN = import.meta.env.VITE_RELAY_DOMAIN
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const SUBDOMAIN_LABEL_MAX_LEN = 63
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const RESERVED_SUBDOMAIN_LABELS = new Set(["api", "admin"])
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export function validateSubdomainLabel(subdomain: string): string | null {
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if (subdomain.length === 0) {
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return "subdomain is required"
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}
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if (subdomain.length > SUBDOMAIN_LABEL_MAX_LEN) {
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return "subdomain must be 63 characters or fewer"
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}
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if (subdomain.startsWith("-") || subdomain.endsWith("-")) {
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return "subdomain cannot start or end with a hyphen"
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}
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if (RESERVED_SUBDOMAIN_LABELS.has(subdomain)) {
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return "subdomain is reserved"
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}
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if (!/^[a-z0-9-]+$/.test(subdomain)) {
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return "subdomain may only contain lowercase letters, numbers, and hyphens"
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}
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return null
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}
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