de.gesellix.docker.client.filesocket.HostnameEncoder Maven / Gradle / Ivy

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Unix Domain Sockets and Named Pipes for the JVM on Linux, macOS, and Windows

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package de.gesellix.docker.client.filesocket;

import okio.ByteString;

import java.util.ArrayList;
import java.util.List;

public class HostnameEncoder {

  /**
   * @see java.net.IDN
   */
  private final static Integer MAX_LABEL_LENGTH = 63;
  private final static Integer MAX_HOSTNAME_LENGTH = MAX_LABEL_LENGTH * 4;

  public String encode(String toEncode) {
    String encoded = ByteString.encodeUtf8(toEncode).hex();
    if (encoded.length() > MAX_LABEL_LENGTH && encoded.length() < MAX_HOSTNAME_LENGTH) {
      List labels = new ArrayList<>();
      int labelCount = (int) Math.ceil(encoded.length() / MAX_LABEL_LENGTH.doubleValue());
      for (int step = 0; step < labelCount; step++) {
        int from = step * MAX_LABEL_LENGTH;
        int to = from + MAX_LABEL_LENGTH;
        labels.add(encoded.substring(from, Math.min(to, encoded.length())));
      }
      return String.join(".", labels);
    }
    return encoded;
  }

  public String decode(String toDecode) {
    String decoded = toDecode;
    if (toDecode.contains(".")) {
      String[] labels = toDecode.split("\\.");
      decoded = String.join("", labels);
//            decoded = elements.dropLastWhile { it.isEmpty() }.toTypedArray().joinToString("");
    }
    return ByteString.decodeHex(decoded).utf8();
  }
}