nmode's Git Repositories - signal-cli/blob - lib/src/main/java/org/asamk/signal/manager/groups/GroupId.java

   1 package org.asamk.signal.manager.groups;
   2
   3 import java.util.Arrays;
   4 import java.util.Base64;
   5
   6 public abstract class GroupId {
   7
   8     private final byte[] id;
   9
  10     public static GroupIdV1 v1(byte[] id) {
  11         return new GroupIdV1(id);
  12     }
  13
  14     public static GroupIdV2 v2(byte[] id) {
  15         return new GroupIdV2(id);
  16     }
  17
  18     public static GroupId unknownVersion(byte[] id) {
  19         if (id.length == 16) {
  20             return new GroupIdV1(id);
  21         } else if (id.length == 32) {
  22             return new GroupIdV2(id);
  23         }
  24
  25         throw new AssertionError("Invalid group id of size " + id.length);
  26     }
  27
  28     public static GroupId fromBase64(String id) throws GroupIdFormatException {
  29         try {
  30             return unknownVersion(java.util.Base64.getDecoder().decode(id));
  31         } catch (Throwable e) {
  32             throw new GroupIdFormatException(id, e);
  33         }
  34     }
  35
  36     protected GroupId(final byte[] id) {
  37         this.id = id;
  38     }
  39
  40     public byte[] serialize() {
  41         return id;
  42     }
  43
  44     public String toBase64() {
  45         return Base64.getEncoder().encodeToString(id);
  46     }
  47
  48     @Override
  49     public boolean equals(final Object o) {
  50         if (this == o) return true;
  51         if (o == null || getClass() != o.getClass()) return false;
  52
  53         final GroupId groupId = (GroupId) o;
  54
  55         return Arrays.equals(id, groupId.id);
  56     }
  57
  58     @Override
  59     public int hashCode() {
  60         return Arrays.hashCode(id);
  61     }
  62 }