import okhttp3.internal.http.MAX_DATE
import okhttp3.internal.http.toHttpDateString
import okhttp3.internal.indexOfControlOrNonAscii
import okhttp3.internal.publicsuffix.PublicSuffixDatabase
import okhttp3.internal.toCanonicalHost
import okhttp3.internal.trimSubstring
import okhttp3.internal.unmodifiable
import org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement

/**
 * An [RFC 6265](http://tools.ietf.org/html/rfc6265) Cookie.
 *

import java.security.cert.X509Certificate
import javax.net.ssl.SSLPeerUnverifiedException
import okhttp3.internal.filterList
import okhttp3.internal.tls.CertificateChainCleaner
import okhttp3.internal.toCanonicalHost
import okio.ByteString
import okio.ByteString.Companion.decodeBase64
import okio.ByteString.Companion.toByteString

/**
 * Constrains which certificates are trusted. Pinning certificates defends against attacks on

 * `null` will be returned if the host cannot be ToASCII encoded or if the result contains
 * unsupported ASCII characters.
 */
internal fun String.toCanonicalHost(): String? {
  val host: String = this

  // If the input contains a :, it’s an IPv6 address.
  if (":" in host) {
    // If the input is encased in square braces "[...]", drop 'em.