package de.thedevstack.conversationsplus.xmpp.avatar;

import de.thedevstack.conversationsplus.xmpp.pubsub.PubSubPacketParser;
import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xmpp.stanzas.IqPacket;

/**
 * Parses the IQ Packets for handling Avatars
 * as defined in XEP-0084.
 * @see {@link http://xmpp.org/extensions/xep-0084.html}
 */
public class AvatarPacketParser {
    /**
     * Extracts the base64 encoded avatar data from an IqPacket.
     * @param packet the IqPacket to be parsed.
     * @return base64 encoded avatar data
     */
    public static String parseAvatarData(IqPacket packet) {
        Element items = PubSubPacketParser.findItems(packet);
        String base64Avatar = null;
        if (null != items) {
            Element item = items.findChild("item");
            if (null != item) {
                base64Avatar = item.findChildContent("data", AvatarPacketGenerator.NAMESPACE_AVATAR_DATA);
            }
        }
        return base64Avatar;
    }
}