val pattern: String

    /** Either `sha1` or `sha256`. */
    val hashAlgorithm: String

    /** The hash of the pinned certificate using [hashAlgorithm]. */
    val hash: ByteString

    init {
      require(
        (pattern.startsWith("*.") && pattern.indexOf("*", 1) == -1) ||
          (pattern.startsWith("**.") && pattern.indexOf("*", 2) == -1) ||
          pattern.indexOf("*") == -1,
      ) {