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import {parse as parseDomain} from 'tldts'
/**
* Validate that a string is a well-formed HTTP(S) URL.
* - Trims input
* - Uses validator + URL parsing
* - Ensures protocol is http or https
* - Ensures a hostname is present and either localhost, IP, or ICANN domain
*/
export function isHttpUrl(value: string): boolean {
const v = (value ?? '').trim()
if (!v) return false
// Require explicit authority form: scheme://
if (!/^https?:\/\//i.test(v)) return false
try {
// First pass: general URL shape using validator
if (
!validator.isURL(v, {
protocols: ['http', 'https'],
require_protocol: true,
require_valid_protocol: true,
allow_underscores: false,
allow_trailing_dot: false,
allow_protocol_relative_urls: false,
validate_length: true,
require_tld: false, // we'll enforce TLD/localhost/IP via tldts
})
) {
return false
}
// Second pass: host must be localhost, IP, or ICANN domain with TLD
const u = new URL(v)
const host = u.hostname
if (!host) return false
if (host.toLowerCase() === 'localhost') return true
const info = parseDomain(host)
if (info.isIp) return true
if (info.isIcann && info.domain && info.publicSuffix) return true
return false
} catch {
return false
}
}
/**
* Gives a reason why a URL failed validation. Useful for fine-grained UX.
*/
export function httpUrlError(value: string): string | null {
const v = (value ?? '').trim()
if (!v) return 'Empty URL'
try {
if (!/^https?:\/\//i.test(v)) return 'Must start with http(s)://'
if (
!validator.isURL(v, {
protocols: ['http', 'https'],
require_protocol: true,
require_valid_protocol: true,
allow_underscores: false,
allow_trailing_dot: false,
allow_protocol_relative_urls: false,
validate_length: true,
require_tld: false,
})
) {
return 'Invalid URL'
}
const u = new URL(v)
if (!u.hostname) return 'Missing host'
const host = u.hostname
if (host.toLowerCase() === 'localhost') return null
const info = parseDomain(host)
if (info.isIp) return null
if (!(info.isIcann && info.domain && info.publicSuffix)) {
if (!host.includes('.'))
return 'Domain must contain a dot or be localhost'
return 'Invalid domain/TLD'
}
return null
} catch {
return 'Invalid URL'
}
}
// Generate helpful URL suggestions for a partially entered value.
export function suggestHttpUrls(input: string, limit = 5): string[] {
const raw = (input ?? '').trim()
if (!raw) return []
// Separate host-ish part from path-ish part
const hasScheme = /^https?:\/\//i.test(raw)
const withoutScheme = hasScheme ? raw.replace(/^https?:\/\//i, '') : raw
const slash = withoutScheme.indexOf('/')
const hostPart = slash === -1 ? withoutScheme : withoutScheme.slice(0, slash)
const pathPart = slash === -1 ? '' : withoutScheme.slice(slash)
const candidates = new Set<string>()
// Always suggest adding https:// and http:// when missing
if (!hasScheme) {
candidates.add(`https://${withoutScheme}`)
candidates.add(`http://${withoutScheme}`)
}
// Suggest www. variant for bare domains
if (hostPart && !/^www\./i.test(hostPart)) {
candidates.add(`https://www.${hostPart}${pathPart}`)
}
// If single-label host (not localhost), suggest common TLDs
const info = parseDomain(hostPart)
const isSingleLabel = hostPart && !hostPart.includes('.')
if (isSingleLabel && hostPart.toLowerCase() !== 'localhost' && !info.isIp) {
for (const tld of ['.com', '.org', '.net']) {
candidates.add(`https://${hostPart}${tld}${pathPart}`)
}
}
// Filter by our validator and de-dup
const valid = Array.from(candidates).filter((c) => isHttpUrl(c))
return valid.slice(0, limit)
}
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