extractHostnamesFromSubjectAltName() — vite Function Reference

Source Code

packages/vite/src/node/utils.ts lines 1072–1108

export function extractHostnamesFromSubjectAltName(
  subjectAltName: string,
): string[] {
  const hostnames: string[] = []
  let remaining = subjectAltName
  while (remaining) {
    const nameEndIndex = remaining.indexOf(':')
    const name = remaining.slice(0, nameEndIndex)
    remaining = remaining.slice(nameEndIndex + 1)
    if (!remaining) break

    const isQuoted = remaining[0] === '"'
    let value: string
    if (isQuoted) {
      const endQuoteIndex = remaining.indexOf('"', 1)
      value = JSON.parse(remaining.slice(0, endQuoteIndex + 1))
      remaining = remaining.slice(endQuoteIndex + 1)
    } else {
      const maybeEndIndex = remaining.indexOf(',')
      const endIndex = maybeEndIndex === -1 ? remaining.length : maybeEndIndex
      value = remaining.slice(0, endIndex)
      remaining = remaining.slice(endIndex)
    }
    remaining = remaining.slice(/* for , */ 1).trimStart()

    if (
      name === 'DNS' &&
      // [::1] might be included but skip it as it's already included as a local address
      value !== '[::1]' &&
      // skip *.IPv4 addresses, which is invalid
      !(value.startsWith('*.') && net.isIPv4(value.slice(2)))
    ) {
      hostnames.push(value.replace('*', 'vite'))
    }
  }
  return hostnames
}