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Decentralized Instant Messaging (Java SDK)
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/* license: https://mit-license.org
 *
 *  DIMP : Decentralized Instant Messaging Protocol
 *
 *                                Written in 2023 by Moky 
 *
 * ==============================================================================
 * The MIT License (MIT)
 *
 * Copyright (c) 2023 Albert Moky
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * ==============================================================================
 */
package chat.dim.msg;

import chat.dim.protocol.Document;
import chat.dim.protocol.Message;
import chat.dim.protocol.Meta;
import chat.dim.protocol.Visa;

public interface MessageHelper {

    /**
     *  Sender's Meta
     *  ~~~~~~~~~~~~~
     *  Extends for the first message package of 'Handshake' protocol.
     */
    static Meta getMeta(Message msg) {
        return Meta.parse(msg.get("meta"));
    }

    static void setMeta(Meta meta, Message msg) {
        msg.setMap("meta", meta);
    }

    /**
     *  Sender's Visa
     *  ~~~~~~~~~~~~~
     *  Extends for the first message package of 'Handshake' protocol.
     */
    static Visa getVisa(Message msg) {
        Document doc = Document.parse(msg.get("visa"));
        if (doc instanceof Visa) {
            return (Visa) doc;
        }
        assert doc == null : "visa document error: " + doc;
        return null;
    }

    static void setVisa(Visa visa, Message msg) {
        msg.setMap("visa", visa);
    }

}