61 lines
1.7 KiB
Java
61 lines
1.7 KiB
Java
package org.thoughtcrime.securesms.util;
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import android.util.Log;
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import com.google.protobuf.InvalidProtocolBufferException;
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import java.io.IOException;
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import java.util.List;
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import static org.whispersystems.textsecure.internal.push.PushMessageProtos.PushMessageContent.GroupContext;
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public class GroupUtil {
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private static final String ENCODED_GROUP_PREFIX = "__textsecure_group__!";
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public static String getEncodedId(byte[] groupId) {
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return ENCODED_GROUP_PREFIX + Hex.toStringCondensed(groupId);
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}
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public static byte[] getDecodedId(String groupId) throws IOException {
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if (!isEncodedGroup(groupId)) {
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throw new IOException("Invalid encoding");
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}
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return Hex.fromStringCondensed(groupId.split("!", 2)[1]);
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}
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public static boolean isEncodedGroup(String groupId) {
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return groupId.startsWith(ENCODED_GROUP_PREFIX);
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}
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public static String getDescription(String encodedGroup) {
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if (encodedGroup == null) {
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return "Group updated.";
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}
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try {
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String description = "";
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GroupContext context = GroupContext.parseFrom(Base64.decode(encodedGroup));
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List<String> members = context.getMembersList();
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String title = context.getName();
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if (!members.isEmpty()) {
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description += Util.join(members, ", ") + " joined the group.";
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}
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if (title != null && !title.trim().isEmpty()) {
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description += " Title is now '" + title + "'.";
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}
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return description;
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} catch (InvalidProtocolBufferException e) {
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Log.w("GroupUtil", e);
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return "Group updated.";
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} catch (IOException e) {
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Log.w("GroupUtil", e);
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return "Group updated.";
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}
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}
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}
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