Android/src/org/thoughtcrime/securesms/mms/OutgoingGroupMediaMessage.java

package org.thoughtcrime.securesms.mms;

import android.content.Context;

import org.thoughtcrime.securesms.database.ThreadDatabase;
import org.thoughtcrime.securesms.recipients.Recipients;
import org.whispersystems.textsecure.util.Base64;

import ws.com.google.android.mms.ContentType;
import ws.com.google.android.mms.pdu.PduBody;
import ws.com.google.android.mms.pdu.PduPart;

import static org.whispersystems.textsecure.push.PushMessageProtos.PushMessageContent.GroupContext;

public class OutgoingGroupMediaMessage extends OutgoingSecureMediaMessage {

  private final GroupContext group;

  public OutgoingGroupMediaMessage(Context context, Recipients recipients,
                                   GroupContext group, byte[] avatar)
  {
    super(context, recipients, new PduBody(), Base64.encodeBytes(group.toByteArray()),
          ThreadDatabase.DistributionTypes.CONVERSATION);

    this.group = group;

    PduPart part = new PduPart();
    part.setData(avatar);
    part.setContentType(ContentType.IMAGE_PNG.getBytes());
    part.setContentId((System.currentTimeMillis()+"").getBytes());
    part.setName(("Image" + System.currentTimeMillis()).getBytes());
    body.addPart(part);
  }

  @Override
  public boolean isGroup() {
    return true;
  }

  public boolean isGroupAdd() {
    return
        group.getType().getNumber() == GroupContext.Type.ADD_VALUE ||
        group.getType().getNumber() == GroupContext.Type.CREATE_VALUE;
  }

  public boolean isGroupQuit() {
    return group.getType().getNumber() == GroupContext.Type.QUIT_VALUE;
  }

  public boolean isGroupModify() {
    return group.getType().getNumber() == GroupContext.Type.MODIFY_VALUE;
  }
}