Packet, Auth reworks & Messages

Client/src/main/java/dev/wiing/gossip/client/Connection.java

@@ -4,10 +4,7 @@ import dev.wiing.gossip.lib.PacketHandler;
 import dev.wiing.gossip.lib.PacketManager;
 import dev.wiing.gossip.lib.models.SecretUser;
 import dev.wiing.gossip.lib.models.User;
-import dev.wiing.gossip.lib.packets.FetchUserPacket;
+import dev.wiing.gossip.lib.packets.*;
-import dev.wiing.gossip.lib.packets.Packet;
-import dev.wiing.gossip.lib.packets.UserDataPacket;
-import javafx.application.Platform;
 
 import java.io.IOException;
 import java.net.Socket;
@@ -58,10 +55,22 @@ public class Connection {
         public void run() {
             while (true) {
                 try {
-                    Packet packet = connection.nextPacket();
+                    Packet packet;
-                    connection.getPacketHandler().runPacket(packet);
+                    if (connection.getSocket().getInputStream().available() > 0 || connection.queuedPackets.isEmpty()) {
+                        packet = connection.nextPacket(false);
+                    } else {
+                        packet = connection.findPacketOfTypes(connection.packetHandler.getListeningTypes());
+                    }
+
+                    if (packet == null) continue;
+
+                    if (!connection.getPacketHandler().runPacket(packet)) {
+                        connection.queuedPackets.add(packet);
+                    }
                 } catch (SocketException e) {
                     break;
+                } catch (IOException e) {
+                    e.printStackTrace();
                 }
             }
         }
@@ -88,8 +97,13 @@ public class Connection {
         }
     }
 
+    public void sendPacketAuthenticated(AuthRequiredPacket packet) {
+        packet.setAuth(getSelf().getUserSecret());
+        sendPacket(packet);
+    }
+
     public Packet nextPacket(boolean useQueue) throws SocketException {
-        if (!queuedPackets.isEmpty()) {
+        if (useQueue && !queuedPackets.isEmpty()) {
             return queuedPackets.remove(0);
         }
 
@@ -120,6 +134,56 @@ public class Connection {
         }
     }
 
+    public Packet findPacketOfTypes(List<Short> types) {
+        Packet packet = null;
+
+        int i;
+        for (i = 0; i < queuedPackets.size(); i++) {
+            Packet queuedPacket = queuedPackets.get(i);
+
+            if (types.contains(queuedPacket.getType())) {
+                packet = queuedPacket;
+                break;
+            }
+        }
+
+        if (packet != null) {
+            queuedPackets.remove(i);
+            return packet;
+        }
+
+        return null;
+    }
+
+    public boolean findAck(short acknowledgement) throws IOException {
+
+        while (true) {
+            while (socket.getInputStream().available() > 0);
+
+            AckPacket ack = null;
+
+            int i;
+            for (i = 0; i < queuedPackets.size(); i++) {
+                Packet queuedPacket = queuedPackets.get(i);
+
+                if (queuedPacket.getType() == AckPacket.TYPE) {
+                    ack = (AckPacket) queuedPacket;
+
+                    if (ack.getAcknowledgement() == acknowledgement) {
+                        break;
+                    }
+
+                    ack = null;
+                }
+            }
+
+            if (ack != null) {
+                queuedPackets.remove(i);
+                return true;
+            }
+        }
+    }
+
     public SecretUser getSelf() {
         return self;
     }
@@ -143,7 +207,7 @@ public class Connection {
             return result;
         }
 
-        FetchUserPacket fetch = new FetchUserPacket();
+        UserFetchPacket fetch = new UserFetchPacket();
         fetch.setUserID(userID);
         Connection.getInstance().sendPacket(fetch);
 

Client/src/main/java/dev/wiing/gossip/client/GossipApp.java

@@ -10,8 +10,11 @@ import java.io.IOException;
 public class GossipApp extends Application {
     @Override
     public void start(Stage stage) throws IOException {
+        System.setProperty("prism.lcdtext", "false");
+
         FXMLLoader fxmlLoader = new FXMLLoader(Program.class.getResource("views/login-view.fxml"));
         Scene scene = new Scene(fxmlLoader.load(), 320, 240);
+
         stage.setTitle("GossipApp");
         stage.setScene(scene);
         stage.show();

Client/src/main/java/dev/wiing/gossip/client/controllers/LoginController.java

@@ -4,9 +4,9 @@ package dev.wiing.gossip.client.controllers;
 import dev.wiing.gossip.client.Connection;
 import dev.wiing.gossip.client.data.UserAvatar;
 import dev.wiing.gossip.lib.models.SecretUser;
-import dev.wiing.gossip.lib.packets.CredentialsPacket;
+import dev.wiing.gossip.lib.packets.RegisterCredentialsPacket;
 import dev.wiing.gossip.lib.packets.Packet;
-import dev.wiing.gossip.lib.packets.RegisterPacket;
+import dev.wiing.gossip.lib.packets.RegisterRequestPacket;
 import javafx.animation.FadeTransition;
 import javafx.event.ActionEvent;
 import javafx.event.Event;
@@ -51,7 +51,7 @@ public class LoginController implements Initializable {
 
     @FXML
     public void onLogin(ActionEvent event) {
-        RegisterPacket packet = new RegisterPacket();
+        RegisterRequestPacket packet = new RegisterRequestPacket();
         packet.setAvatarID((byte)0);
         packet.setUsername(txtUsername.getText());
 
@@ -64,8 +64,8 @@ public class LoginController implements Initializable {
             throw new RuntimeException(e);
         }
 
-        if (result != null && result.getType() == CredentialsPacket.TYPE) {
+        if (result != null && result.getType() == RegisterCredentialsPacket.TYPE) {
-            CredentialsPacket creds = (CredentialsPacket)result;
+            RegisterCredentialsPacket creds = (RegisterCredentialsPacket)result;
 
             SecretUser user = new SecretUser(packet.getUsername(), packet.getAvatarID(), creds.getUID(), creds.getSecret());
             Connection.getInstance().setSelf(user);

Client/src/main/java/dev/wiing/gossip/client/controllers/MainChatController.java

@@ -1,27 +1,33 @@
 package dev.wiing.gossip.client.controllers;
 
 import dev.wiing.gossip.client.Connection;
+import dev.wiing.gossip.client.controllers.item.MessageItemController;
 import dev.wiing.gossip.client.generic.Pair;
 import dev.wiing.gossip.client.utils.Utils;
+import dev.wiing.gossip.lib.models.Message;
 import dev.wiing.gossip.lib.models.Topic;
-import dev.wiing.gossip.lib.models.User;
+import dev.wiing.gossip.lib.packets.MessagePushPacket;
+import dev.wiing.gossip.lib.packets.TopicJoinPacket;
+import javafx.application.Platform;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
-import javafx.fxml.Initializable;
 import javafx.scene.Parent;
 import javafx.scene.control.Label;
 import javafx.scene.control.TextArea;
 import javafx.scene.input.MouseEvent;
 import javafx.scene.layout.VBox;
 
-import java.net.URL;
+import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
-import java.util.ResourceBundle;
 
 public class MainChatController {
 
     private Topic topic;
 
+    private final List<MessageItemController> messageItems = new ArrayList<>();
+    private MessageItemController latestMessageItem = null;
+
     @FXML
     private Label lblBabblersCount;
 
@@ -68,7 +74,15 @@ public class MainChatController {
 
         this.topic.addChangeListener(evt -> {
             if (evt.getPropertyName().equals("userAdd") || evt.getPropertyName().equals("userRemove")) {
-                setBabblerCount(topic.getUsersReadOnly().size());
+                Platform.runLater(() -> {
+                    setBabblerCount(topic.getUsersReadOnly().size());
+                });
+            }
+
+            if (evt.getPropertyName().equals("messageAdd")) {
+                Platform.runLater(() -> {
+                    addMessage((Message)evt.getNewValue());
+                });
             }
         });
     }
@@ -78,6 +92,10 @@ public class MainChatController {
         lblVisitTopicName.setText(name);
     }
 
+    public Topic getTopic() {
+        return topic;
+    }
+
     private void setBabblerCount(int count) {
         String res = "No Babblers";
         if (count == 1) {
@@ -95,20 +113,59 @@ public class MainChatController {
         vboxVisitPage.setVisible(!participating);
     }
 
+    private void addMessage(Message message) {
+        if (latestMessageItem == null || latestMessageItem.getAuthor().getUserID() != message.getAuthor().getUserID()) {
+            var newPair = MessageItemController.createInstance();
+
+            newPair.second().setAuthor(message.getAuthor());
+
+            vboxMessages.getChildren().add(newPair.first());
+
+            latestMessageItem = newPair.second();
+        }
+
+        latestMessageItem.addMessage(message);
+    }
+
     @FXML
     void onJoinTopic(ActionEvent event) {
-        topic.addUser(Connection.getInstance().getSelf());
+        TopicJoinPacket packet = new TopicJoinPacket();
+        packet.setTopicID(topic.getId());
 
-        togglePages(true);
+        Connection.getInstance().sendPacketAuthenticated(packet);
+
+        try {
+            Connection.getInstance().findAck(TopicJoinPacket.TYPE);
+
+            togglePages(true);
+
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @FXML
     void onSend(MouseEvent event) {
+        String messageContents = txtCompose.getText();
 
+        txtCompose.clear();
+
+        MessagePushPacket packet = new MessagePushPacket();
+        packet.setTopicID(topic.getId());
+        packet.setMessage(messageContents);
+
+        Connection.getInstance().sendPacketAuthenticated(packet);
+
+        try {
+            Connection.getInstance().findAck(MessagePushPacket.TYPE);
+
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     public static Pair<Parent, MainChatController> createInstance() {
-        return Utils.createInstance("views/main-chat-view.fxml");
+        return Utils.createInstance("views/chat-view.fxml");
     }
 
 }

Client/src/main/java/dev/wiing/gossip/client/controllers/MainController.java

@@ -1,10 +1,12 @@
 package dev.wiing.gossip.client.controllers;
 
 import dev.wiing.gossip.client.Connection;
-import dev.wiing.gossip.client.controllers.item.MainTopicItemController;
+import dev.wiing.gossip.client.controllers.item.TopicItemController;
 import dev.wiing.gossip.client.data.UserAvatar;
 import dev.wiing.gossip.client.generic.Pair;
 import dev.wiing.gossip.client.utils.Utils;
+import dev.wiing.gossip.lib.data.LongData;
+import dev.wiing.gossip.lib.models.Message;
 import dev.wiing.gossip.lib.models.Topic;
 import dev.wiing.gossip.lib.models.User;
 import dev.wiing.gossip.lib.packets.*;
@@ -27,7 +29,7 @@ public class MainController implements Initializable {
 
     Topic activeTopic = null;
     Parent activeTopicElement = null;
-    private final Map<Long, Parent> topicContentMap = new ConcurrentHashMap<>();
+    private final Map<Long, Pair<Parent, MainChatController>> topicMap = new ConcurrentHashMap<>();
 
     @FXML
     private VBox vboxRoot;
@@ -54,7 +56,7 @@ public class MainController implements Initializable {
 
         UserAvatar.getAvatar(user.getAvatarID()).applyToRegionBackground(paneIcon, true);
 
-        Connection.getInstance().getPacketHandler().addListener(TopicAddedPacket.class, packet -> {
+        Connection.getInstance().getPacketHandler().addListener(TopicCreatedPacket.class, packet -> {
             User host = Connection.getInstance().getUser(packet.getHostID());
 
             Topic topic = new Topic(
@@ -65,13 +67,13 @@ public class MainController implements Initializable {
                     packet.getTopicColor()
             );
 
-            var pair = MainTopicItemController.createInstance();
+            var pair = TopicItemController.createInstance();
             pair.second().setTopic(topic);
 
             var contentPair = MainChatController.createInstance();
             contentPair.second().setTopic(topic);
 
-            topicContentMap.put(topic.getId(), contentPair.first());
+            topicMap.put(topic.getId(), contentPair);
 
             AnchorPane.setLeftAnchor(contentPair.first(), 0.0);
             AnchorPane.setBottomAnchor(contentPair.first(), 0.0);
@@ -90,6 +92,41 @@ public class MainController implements Initializable {
             });
         });
 
+        Connection.getInstance().getPacketHandler().addListener(TopicUpdatePacket.class, packet -> {
+            if (!topicMap.containsKey(packet.getTopicID())) return;
+
+            Topic topic = topicMap.get(packet.getTopicID()).second().getTopic();
+
+            if (packet.isTopicNameModified())           topic.setName(packet.getTopicName());
+            if (packet.isTopicDescriptionModified())    topic.setDescription(packet.getTopicDescription());
+
+            if (packet.haveUsersJoined()) {
+                for (LongData userID : packet.getUsersJoined()) {
+                    User userJoined = Connection.getInstance().getUser(userID.getValue());
+                    topic.addUser(userJoined);
+                }
+            }
+
+            if (packet.haveUsersLeft()) {
+                for (LongData userID : packet.getUsersLeft()) {
+                    User userJoined = Connection.getInstance().getUser(userID.getValue());
+                    topic.removeUser(userJoined);
+                }
+            }
+        });
+
+        Connection.getInstance().getPacketHandler().addListener(MessageCreatedPacket.class, packet -> {
+            if (!topicMap.containsKey(packet.getTopicID())) return;
+
+            Topic topic = topicMap.get(packet.getTopicID()).second().getTopic();
+
+            User author = Connection.getInstance().getUser(packet.getAuthorID());
+
+            Message message = new Message(author, topic, packet.getContents());
+
+            topic.addMessage(message);
+        });
+
         Connection.getInstance().beginHandlingPackets();
 
         vboxTopics.getChildren().clear();
@@ -98,7 +135,7 @@ public class MainController implements Initializable {
     public void setActiveTopic(Topic topic, Parent element) {
         if (activeTopic != null) {
             activeTopicElement.getStyleClass().remove("tag-min");
-            topicContentMap.get(activeTopic.getId()).setVisible(false);
+            topicMap.get(activeTopic.getId()).first().setVisible(false);
         } else {
             lblJoinMessage.setVisible(false);
         }
@@ -120,13 +157,13 @@ public class MainController implements Initializable {
         activeTopic = topic;
         activeTopicElement = element;
 
-        topicContentMap.get(activeTopic.getId()).setVisible(true);
+        topicMap.get(activeTopic.getId()).first().setVisible(true);
     }
 
     @FXML
     void onCreateTopic(ActionEvent event) {
-        CreateTopicPacket packet = new CreateTopicPacket();
+        TopicPushPacket packet = new TopicPushPacket();
-        packet.setUserSecret(Connection.getInstance().getSelf().getUserSecret());
+        packet.setAuth(Connection.getInstance().getSelf().getUserSecret());
         packet.setTopicName("Point Nemo");
         packet.setTopicDescription("We are so gone XDD");
 

Client/src/main/java/dev/wiing/gossip/client/controllers/item/MessageItemController.java

@@ -0,0 +1,88 @@
+package dev.wiing.gossip.client.controllers.item;
+
+import dev.wiing.gossip.client.Connection;
+import dev.wiing.gossip.client.data.UserAvatar;
+import dev.wiing.gossip.client.generic.Pair;
+import dev.wiing.gossip.client.utils.Utils;
+import dev.wiing.gossip.lib.models.Message;
+import dev.wiing.gossip.lib.models.User;
+import javafx.fxml.FXML;
+import javafx.fxml.Initializable;
+import javafx.scene.Parent;
+import javafx.scene.control.Label;
+import javafx.scene.layout.Pane;
+import javafx.scene.layout.VBox;
+
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.ResourceBundle;
+
+public class MessageItemController implements Initializable {
+
+    private User author;
+    private final List<Message> messages = Collections.synchronizedList(new ArrayList<>());
+
+    @FXML
+    private Label lblAuthor;
+
+    @FXML
+    private Label lblTag;
+
+    @FXML
+    private Label lblTimeAgo;
+
+    @FXML
+    private Pane paneIcon;
+
+    @FXML
+    private VBox vboxMessages;
+
+    @Override
+    public void initialize(URL location, ResourceBundle resources) {
+        vboxMessages.getChildren().clear();
+    }
+
+    public User getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(User author) {
+        this.author = author;
+
+        this.lblAuthor.setText(author.getUsernameDisplay());
+
+        if (this.author.getUserID() == Connection.getInstance().getSelf().getUserID()) {
+            this.lblTag.setVisible(true);
+            this.lblTag.setText("You");
+        }
+
+        UserAvatar.getAvatar(this.author.getAvatarID()).applyToRegionBackground(paneIcon, true);
+    }
+
+    public void addMessage(Message message) {
+        if (message.getAuthor() != author) return;
+
+        if (!this.lblTag.isVisible() && messages.isEmpty() && message.getTopic().getHost().getUserID() == message.getAuthor().getUserID()) {
+            this.lblTag.setVisible(true);
+            this.lblTag.setText("Host");
+            this.lblTag.getStyleClass().add("secondary");
+        }
+
+        messages.add(message);
+
+        Label label = new Label(message.getContents());
+
+        vboxMessages.getChildren().add(label);
+    }
+
+    public List<Message> getMessageReadOnly() {
+        return Collections.unmodifiableList(messages);
+    }
+
+    public static Pair<Parent, MessageItemController> createInstance() {
+        return Utils.createInstance("views/message-item.fxml");
+    }
+
+}

Client/src/main/java/dev/wiing/gossip/client/controllers/item/TopicItemController.java

@@ -3,7 +3,6 @@ package dev.wiing.gossip.client.controllers.item;
 import dev.wiing.gossip.client.generic.Pair;
 import dev.wiing.gossip.client.utils.Utils;
 import dev.wiing.gossip.lib.models.Topic;
-import javafx.event.ActionEvent;
 import javafx.event.EventHandler;
 import javafx.fxml.FXML;
 import javafx.scene.Parent;
@@ -11,7 +10,7 @@ import javafx.scene.control.Label;
 import javafx.scene.input.MouseEvent;
 import javafx.scene.layout.HBox;
 
-public class MainTopicItemController {
+public class TopicItemController {
 
     private Topic topic;
 
@@ -30,8 +29,8 @@ public class MainTopicItemController {
         return topic;
     }
 
-    public static Pair<Parent, MainTopicItemController> createInstance() {
+    public static Pair<Parent, TopicItemController> createInstance() {
-        return Utils.createInstance("views/main-topic-item.fxml");
+        return Utils.createInstance("views/topic-item.fxml");
     }
 
     public void setOnMouseClicked(EventHandler<MouseEvent> eventHandler) {

Client/src/main/resources/dev/wiing/gossip/client/styling.css

@@ -151,7 +151,7 @@ Label.tag {
 }
 
 Label.tag.small {
-    -fx-background-color: -color;
+    -fx-background-color: ladder(hsb(0, 0%, 30%), -color, #0000);
     -fx-background-radius: 4px;
     -fx-border-width: 0;
     -fx-text-fill: white;
@@ -159,6 +159,10 @@ Label.tag.small {
     -fx-padding: 2px 8px;
 }
 
+.tag.secondary {
+    -color: #4a4a55;
+}
+
 CheckBox .box {
     -fx-background-color: #25252c;
 }

Client/src/main/resources/dev/wiing/gossip/client/views/chat-view.fxml

@@ -16,8 +16,7 @@
 <?import javafx.scene.layout.VBox?>
 <?import javafx.scene.shape.Circle?>
 
-
+<AnchorPane prefHeight="318.0" prefWidth="523.0" xmlns="http://javafx.com/javafx/21" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.MainChatController">
-<AnchorPane xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.MainChatController">
    <children>
       <VBox fx:id="vboxVisitPage" alignment="CENTER" layoutX="10.0" layoutY="10.0" spacing="8.0" visible="false" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
          <children>
@@ -57,7 +56,7 @@
                   <Label fx:id="lblBabblersCount" alignment="CENTER_RIGHT" maxWidth="1.7976931348623157E308" style="-fx-font-size: 12;" styleClass="faint" text="2 babblers" HBox.hgrow="ALWAYS" />
                </children>
             </HBox>
-            <ScrollPane fitToHeight="true" fitToWidth="true" VBox.vgrow="ALWAYS">
+            <ScrollPane fitToWidth="true" hbarPolicy="NEVER" VBox.vgrow="ALWAYS">
                <content>
                   <VBox fx:id="vboxMessages" spacing="16.0">
                      <children>
@@ -126,6 +125,12 @@
                   <String fx:value="container" />
                   <String fx:value="list" />
                </styleClass>
+               <VBox.margin>
+                  <Insets />
+               </VBox.margin>
+               <padding>
+                  <Insets right="4.0" />
+               </padding>
             </ScrollPane>
             <VBox spacing="8.0">
                <children>
@@ -141,7 +146,7 @@
                         <String fx:value="list" />
                      </styleClass>
                      <children>
-                        <TextArea fx:id="txtCompose" maxHeight="1.7976931348623157E308" minHeight="1.0" prefHeight="24.0" prefRowCount="1" promptText="Compose..." styleClass="transparent" wrapText="true" HBox.hgrow="ALWAYS" />
+                        <TextArea fx:id="txtCompose" maxHeight="1.7976931348623157E308" minHeight="1.0" prefHeight="25.0" prefRowCount="1" promptText="Compose..." styleClass="transparent" wrapText="true" HBox.hgrow="ALWAYS" />
                         <ImageView fitHeight="20.0" fitWidth="20.0" onMouseClicked="#onSend" opacity="0.5" pickOnBounds="true" preserveRatio="true">
                            <image>
                               <Image url="@../icons/icon-send-2.png" />

Client/src/main/resources/dev/wiing/gossip/client/views/message-item.fxml

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import java.lang.String?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.Pane?>
+<?import javafx.scene.layout.VBox?>
+
+<HBox spacing="8.0" stylesheets="@../styling.css" xmlns="http://javafx.com/javafx/21" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.item.MessageItemController">
+   <children>
+      <Pane fx:id="paneIcon" maxHeight="40.0" maxWidth="40.0" minHeight="40.0" minWidth="40.0" style="-fx-background-color: white;" />
+      <VBox alignment="CENTER_LEFT" minHeight="40.0" spacing="4.0" HBox.hgrow="ALWAYS">
+         <children>
+            <HBox alignment="BOTTOM_LEFT" spacing="8.0">
+               <children>
+                  <Label fx:id="lblAuthor" style="-fx-font-size: 14;" text="\@ Username">
+                     <styleClass>
+                        <String fx:value="axis" />
+                        <String fx:value="accent" />
+                     </styleClass>
+                  </Label>
+                  <Label fx:id="lblTag" text="You" visible="false">
+                     <styleClass>
+                        <String fx:value="tag" />
+                        <String fx:value="small" />
+                        <String fx:value="axis" />
+                     </styleClass>
+                  </Label>
+                  <Label fx:id="lblTimeAgo" alignment="CENTER_RIGHT" contentDisplay="RIGHT" maxWidth="1.7976931348623157E308" style="-fx-font-size: 10;" styleClass="faint" text="10 minutes ago" textAlignment="RIGHT" HBox.hgrow="ALWAYS" />
+               </children>
+            </HBox>
+            <VBox fx:id="vboxMessages" spacing="4.0">
+               <children>
+                  <Label text="Message contents" />
+               </children>
+            </VBox>
+         </children>
+      </VBox>
+   </children>
+</HBox>

Client/src/main/resources/dev/wiing/gossip/client/views/topic-item.fxml

@@ -8,7 +8,7 @@
 <?import javafx.scene.image.ImageView?>
 <?import javafx.scene.layout.HBox?>
 
-<HBox fx:id="hboxParent" opacity="0.8" spacing="4.0" xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.item.MainTopicItemController">
+<HBox fx:id="hboxParent" opacity="0.8" spacing="4.0" xmlns="http://javafx.com/javafx/20.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="dev.wiing.gossip.client.controllers.item.TopicItemController">
    <children>
       <ImageView blendMode="OVERLAY" fitHeight="16.0" fitWidth="16.0" opacity="0.4" pickOnBounds="true" preserveRatio="true">
          <image>

Lib/src/main/java/dev/wiing/gossip/lib/PacketHandler.java

@@ -1,8 +1,9 @@
 package dev.wiing.gossip.lib;
 
-import dev.wiing.gossip.lib.packets.CreateTopicPacket;
+import dev.wiing.gossip.lib.packets.MessageCreatedPacket;
 import dev.wiing.gossip.lib.packets.Packet;
-import dev.wiing.gossip.lib.packets.TopicAddedPacket;
+import dev.wiing.gossip.lib.packets.TopicCreatedPacket;
+import dev.wiing.gossip.lib.packets.TopicUpdatePacket;
 
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
@@ -28,22 +29,30 @@ public class PacketHandler {
         listeners.get(type).remove(listener);
     }
 
-    public <T extends Packet> void runPacket(Class<T> packetClass, T packet) {
+    public <T extends Packet> boolean runPacket(Class<T> packetClass, T packet) {
         Set<PacketListener<T>> result = getListeners(packetClass);
 
-        if (result == null) return;
+        if (result == null || result.isEmpty()) return false;
 
         for (PacketListener<T> packetListener : result) {
             packetListener.onReceive(packet);
         }
+
+        return true;
     }
 
-    public void runPacket(Packet packet) {
+    public boolean runPacket(Packet packet) {
         switch (packet.getType()) {
-            case TopicAddedPacket.TYPE:
+            case TopicCreatedPacket.TYPE:
-                runPacket(TopicAddedPacket.class, (TopicAddedPacket)packet);
+                return runPacket(TopicCreatedPacket.class, (TopicCreatedPacket)packet);
-                break;
+
+            case TopicUpdatePacket.TYPE:
+                return runPacket(TopicUpdatePacket.class, (TopicUpdatePacket)packet);
+
+            case MessageCreatedPacket.TYPE:
+                return runPacket(MessageCreatedPacket.class, (MessageCreatedPacket)packet);
         }
+        return false;
     }
 
     public <T extends Packet> Set<PacketListener<T>> getListeners(Class<T> packetClass) {
@@ -55,4 +64,14 @@ public class PacketHandler {
         }).collect(Collectors.toSet());
     }
 
+    public List<Short> getListeningTypes() {
+        return new ArrayList<>() {
+            {
+                add(TopicCreatedPacket.TYPE);
+                add(TopicUpdatePacket.TYPE);
+                add(MessageCreatedPacket.TYPE);
+            }
+        };
+    }
+
 }

Lib/src/main/java/dev/wiing/gossip/lib/PacketManager.java

@@ -14,15 +14,21 @@ public class PacketManager {
     private final List<Packet> packetList = new ArrayList<>() {
         {
             add(new TestPacket());
+            add(new AckPacket());
 
-            add(new RegisterPacket());
+            add(new RegisterRequestPacket());
-            add(new CredentialsPacket());
+            add(new RegisterCredentialsPacket());
 
-            add(new CreateTopicPacket());
+            add(new TopicPushPacket());
-            add(new TopicAddedPacket());
+            add(new TopicCreatedPacket());
+            add(new TopicJoinPacket());
+            add(new TopicUpdatePacket());
 
-            add(new FetchUserPacket());
+            add(new UserFetchPacket());
             add(new UserDataPacket());
+
+            add(new MessagePushPacket());
+            add(new MessageCreatedPacket());
         }
     };
 

Lib/src/main/java/dev/wiing/gossip/lib/data/AuthSecret.java

@@ -0,0 +1,47 @@
+package dev.wiing.gossip.lib.data;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+
+public class AuthSecret {
+
+    public static final int LENGTH = 32;
+
+    private byte[] value = new byte[LENGTH];
+
+    public AuthSecret(byte... value) {
+        if (value.length != LENGTH)
+            throw new RuntimeException("Invalid length");
+
+        this.value = value;
+    }
+
+    public AuthSecret(Byte... value) {
+        if (value.length != LENGTH)
+            throw new RuntimeException("Invalid length");
+
+        for (int i = 0; i < value.length; i++) {
+            this.value[i] = value[i];
+        }
+    }
+
+    public AuthSecret(List<Byte> value) {
+        this(value.toArray(new Byte[32]));
+    }
+
+    public AuthSecret(String value) {
+        this(value.getBytes());
+    }
+
+    public AuthSecret(ByteBuffer buffer) {
+        buffer.get(value);
+    }
+
+    public byte[] getBytes() {
+        return value;
+    }
+
+    public String getString() {
+        return new String(value);
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/data/ListData.java

@@ -0,0 +1,60 @@
+package dev.wiing.gossip.lib.data;
+
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.Function;
+
+public class ListData<T extends PacketData> implements PacketData {
+
+    @FunctionalInterface
+    public interface ListDataInitializer<U> {
+        U create();
+    }
+
+    private final ListDataInitializer<T> entryInitializer;
+
+    private final List<T> data = new ArrayList<>();
+
+    public ListData(ListDataInitializer<T> entryInitializer) {
+        this.entryInitializer = entryInitializer;
+    }
+
+    public List<T> getData() {
+        return data;
+    }
+
+    @Override
+    public int getLength() {
+        return 4 + data.stream()
+                .map(PacketData::getLength)
+                .reduce(0, Integer::sum);
+    }
+
+    @Override
+    public ByteBuffer getBytes() {
+        ByteBuffer buffer = ByteBuffer.allocate(getLength());
+
+        buffer.putInt(data.size());
+
+        for (T datum : data) {
+            buffer.put(datum.getBytes());
+        }
+
+        return buffer.rewind();
+    }
+
+    @Override
+    public void setBytes(ByteBuffer buffer) {
+        this.data.clear();
+
+        int size = buffer.getInt();
+
+        for (; size > 0; --size) {
+            T entry = entryInitializer.create();
+            entry.setBytes(buffer);
+            this.data.add(entry);
+        }
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/data/LongData.java

@@ -0,0 +1,34 @@
+package dev.wiing.gossip.lib.data;
+
+import java.nio.ByteBuffer;
+
+public class LongData implements PacketAtomicData<Long> {
+
+    private long value = 0;
+
+    @Override
+    public Long getValue() {
+        return value;
+    }
+
+    @Override
+    public LongData setValue(Long value) {
+        this.value = value;
+        return this;
+    }
+
+    @Override
+    public int getLength() {
+        return 8;
+    }
+
+    @Override
+    public ByteBuffer getBytes() {
+        return ByteBuffer.allocate(getLength()).putLong(value).rewind();
+    }
+
+    @Override
+    public void setBytes(ByteBuffer buffer) {
+        value = buffer.getLong();
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/data/PacketAtomicData.java

@@ -0,0 +1,6 @@
+package dev.wiing.gossip.lib.data;
+
+public interface PacketAtomicData<T> extends PacketData {
+    T getValue();
+    PacketAtomicData<T> setValue(T value);
+}

Lib/src/main/java/dev/wiing/gossip/lib/data/PacketData.java

@@ -1,13 +1,8 @@
 package dev.wiing.gossip.lib.data;
 
-import java.io.ByteArrayInputStream;
 import java.nio.ByteBuffer;
 
-public interface DataType<T> {
+public interface PacketData {
-
-    T getValue();
-    void setValue(T val);
-
     int getLength();
 
     ByteBuffer getBytes();

Lib/src/main/java/dev/wiing/gossip/lib/data/StringData.java

@@ -1,11 +1,9 @@
 package dev.wiing.gossip.lib.data;
 
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
 import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
 
-public class StringType implements DataType<String> {
+public class StringData implements PacketAtomicData<String> {
 
     private String value = "";
 
@@ -15,8 +13,9 @@ public class StringType implements DataType<String> {
     }
 
     @Override
-    public void setValue(String val) {
+    public StringData setValue(String val) {
         this.value = val;
+        return this;
     }
 
     @Override

Lib/src/main/java/dev/wiing/gossip/lib/models/Message.java

@@ -3,15 +3,35 @@ package dev.wiing.gossip.lib.models;
 import java.time.LocalDateTime;
 
 public class Message {
-    private User author;
+    private final User author;
-    private String message;
+    private final Topic topic;
-    private LocalDateTime postTime;
+    private final String contents;
+    private final LocalDateTime postTime;
 
-    public Message(User author, String message, LocalDateTime postTime) {
+    public Message(User author, Topic topic, String contents, LocalDateTime postTime) {
         this.author = author;
-        this.message = message;
+        this.topic = topic;
+        this.contents = contents;
         this.postTime = postTime;
     }
 
+    public Message(User author, Topic topic, String contents) {
+        this(author, topic, contents, LocalDateTime.now());
+    }
 
+    public User getAuthor() {
+        return author;
+    }
+
+    public Topic getTopic() {
+        return topic;
+    }
+
+    public String getContents() {
+        return contents;
+    }
+
+    public LocalDateTime getPostTime() {
+        return postTime;
+    }
 }

Lib/src/main/java/dev/wiing/gossip/lib/models/SecretUser.java

@@ -1,14 +1,17 @@
 package dev.wiing.gossip.lib.models;
 
-public class SecretUser extends User {
+import dev.wiing.gossip.lib.data.AuthSecret;
-    private final byte[] userSecret;
+import dev.wiing.gossip.lib.models.User;
 
-    public SecretUser(String username, int iconID, long userID, byte[] userSecret) {
+public class SecretUser extends User {
+    private final AuthSecret userSecret;
+
+    public SecretUser(String username, int iconID, long userID, AuthSecret userSecret) {
         super(username, iconID, userID);
         this.userSecret = userSecret;
     }
 
-    public byte[] getUserSecret() {
+    public AuthSecret getUserSecret() {
         return userSecret;
     }
 }

Lib/src/main/java/dev/wiing/gossip/lib/models/Topic.java

@@ -2,8 +2,7 @@ package dev.wiing.gossip.lib.models;
 
 import java.beans.PropertyChangeListener;
 import java.beans.PropertyChangeSupport;
-import java.util.Collections;
+import java.util.*;
-import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 public class Topic {
@@ -16,6 +15,8 @@ public class Topic {
     private final Map<Long, User> users = new ConcurrentHashMap<>();
     private short color;
 
+    private final List<Message> messages = Collections.synchronizedList(new ArrayList<>());
+
     public Topic(long id, String name, String description, User host, short color) {
         this.id = id;
         this.name = name;
@@ -72,20 +73,30 @@ public class Topic {
         if (this.users.containsKey(user.getUserID())) return;
 
         this.users.put(user.getUserID(), user);
-        this.changeSupport.firePropertyChange("userAdd", null, getUsersReadOnly());
+        this.changeSupport.firePropertyChange("userAdd", user, null);
     }
 
     public void removeUser(User user) {
         if (!this.users.containsKey(user.getUserID())) return;
 
         this.users.remove(user.getUserID());
-        this.changeSupport.firePropertyChange("userRemove", null, getUsersReadOnly());
+        this.changeSupport.firePropertyChange("userRemove", null, user);
     }
 
     public boolean hasUser(User user) {
         return this.users.containsKey(user.getUserID());
     }
 
+    public List<Message> getMessagesReadOnly() {
+        return Collections.unmodifiableList(messages);
+    }
+
+    public void addMessage(Message message) {
+        messages.add(message);
+
+        this.changeSupport.firePropertyChange("messageAdd", null, message);
+    }
+
     public void addChangeListener(PropertyChangeListener listener) {
         this.changeSupport.addPropertyChangeListener(listener);
     }

Lib/src/main/java/dev/wiing/gossip/lib/packets/AckPacket.java

@@ -0,0 +1,41 @@
+package dev.wiing.gossip.lib.packets;
+
+import java.nio.ByteBuffer;
+
+public class AckPacket extends Packet {
+
+    public static final short TYPE = 0x02;
+    public static final int LENGTH = 0x002;
+
+    private short acknowledgement;
+
+    public AckPacket() {
+        super(TYPE, LENGTH);
+    }
+
+    public short getAcknowledgement() {
+        return acknowledgement;
+    }
+
+    public void setAcknowledgement(short acknowledgement) {
+        this.acknowledgement = acknowledgement;
+    }
+
+    public void setAcknowledgement(Packet packet) {
+        setAcknowledgement(packet.getType());
+    }
+
+    @Override
+    public Packet readBytes(ByteBuffer buffer, int size) {
+        AckPacket packet = new AckPacket();
+
+        packet.acknowledgement = buffer.getShort();
+
+        return packet;
+    }
+
+    @Override
+    public void writeBytes(ByteBuffer buffer) {
+        buffer.putShort(acknowledgement);
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/packets/AuthRequiredPacket.java

@@ -0,0 +1,19 @@
+package dev.wiing.gossip.lib.packets;
+
+import dev.wiing.gossip.lib.data.AuthSecret;
+
+public abstract class AuthRequiredPacket extends Packet {
+    private AuthSecret auth;
+
+    public AuthRequiredPacket(short type, int length) {
+        super(type, length);
+    }
+
+    public AuthSecret getAuth() {
+        return auth;
+    }
+
+    public void setAuth(AuthSecret auth) {
+        this.auth = auth;
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/packets/MessageCreatedPacket.java

@@ -0,0 +1,63 @@
+package dev.wiing.gossip.lib.packets;
+
+import dev.wiing.gossip.lib.data.StringData;
+
+import java.nio.ByteBuffer;
+
+public class MessageCreatedPacket extends Packet {
+
+    public static final short TYPE = 0x32;
+    public static final int LENGTH = 0x014;
+
+    private long authorID;
+    private long topicID;
+    private final StringData contents = new StringData();
+
+    public MessageCreatedPacket() {
+        super(TYPE, LENGTH);
+    }
+
+    public long getAuthorID() {
+        return authorID;
+    }
+
+    public void setAuthorID(long authorID) {
+        this.authorID = authorID;
+    }
+
+    public long getTopicID() {
+        return topicID;
+    }
+
+    public void setTopicID(long topicID) {
+        this.topicID = topicID;
+    }
+
+    public String getContents() {
+        return contents.getValue();
+    }
+
+    public void setContents(String contents) {
+        this.contents.setValue(contents);
+        setLength(16 + this.contents.getLength());
+    }
+
+    @Override
+    public Packet readBytes(ByteBuffer buffer, int size) {
+        MessageCreatedPacket packet = new MessageCreatedPacket();
+        packet.setLength(size);
+
+        packet.authorID = buffer.getLong();
+        packet.topicID = buffer.getLong();
+        packet.contents.setBytes(buffer);
+
+        return packet;
+    }
+
+    @Override
+    public void writeBytes(ByteBuffer buffer) {
+        buffer.putLong(authorID);
+        buffer.putLong(topicID);
+        buffer.put(contents.getBytes());
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/packets/MessagePushPacket.java

@@ -0,0 +1,54 @@
+package dev.wiing.gossip.lib.packets;
+
+import dev.wiing.gossip.lib.data.AuthSecret;
+import dev.wiing.gossip.lib.data.StringData;
+
+import java.nio.ByteBuffer;
+
+public class MessagePushPacket extends AuthRequiredPacket {
+    public static final short TYPE = 0x31;
+    public static final int LENGTH = 0x02C;
+
+    private long topicID;
+    private final StringData message = new StringData();
+
+    public MessagePushPacket() {
+        super(TYPE, LENGTH);
+    }
+
+    public long getTopicID() {
+        return topicID;
+    }
+
+    public void setTopicID(long topicID) {
+        this.topicID = topicID;
+    }
+
+    public String getMessage() {
+        return message.getValue();
+    }
+
+    public void setMessage(String message) {
+        this.message.setValue(message);
+        setLength(40 + this.message.getLength());
+    }
+
+    @Override
+    public Packet readBytes(ByteBuffer buffer, int size) {
+        MessagePushPacket packet = new MessagePushPacket();
+        packet.setLength(size);
+
+        packet.setAuth(new AuthSecret(buffer));
+        packet.topicID = buffer.getLong();
+        packet.message.setBytes(buffer);
+
+        return packet;
+    }
+
+    @Override
+    public void writeBytes(ByteBuffer buffer) {
+        buffer.put(getAuth().getBytes());
+        buffer.putLong(topicID);
+        buffer.put(message.getBytes());
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/packets/RegisterCredentialsPacket.java

@@ -1,24 +1,26 @@
 package dev.wiing.gossip.lib.packets;
 
+import dev.wiing.gossip.lib.data.AuthSecret;
+
 import java.nio.ByteBuffer;
 
-public class CredentialsPacket extends Packet {
+public class RegisterCredentialsPacket extends Packet {
 
-    public static short TYPE = 0x03;
+    public static short TYPE = 0x04;
     public static int LENGTH = 0x028;
 
-    private byte[] secret = new byte[32];
+    private AuthSecret secret;
     private long uID;
 
-    public CredentialsPacket() {
+    public RegisterCredentialsPacket() {
         super(TYPE, LENGTH);
     }
 
-    public byte[] getSecret() {
+    public AuthSecret getSecret() {
         return secret;
     }
 
-    public void setSecret(byte[] secret) {
+    public void setSecret(AuthSecret secret) {
         this.secret = secret;
     }
 
@@ -32,9 +34,9 @@ public class CredentialsPacket extends Packet {
 
     @Override
     public Packet readBytes(ByteBuffer buffer, int size) {
-        CredentialsPacket packet = new CredentialsPacket();
+        RegisterCredentialsPacket packet = new RegisterCredentialsPacket();
 
-        buffer.get(packet.secret);
+        packet.secret = new AuthSecret(buffer);
         packet.setUID(buffer.getLong());
 
         return packet;
@@ -42,7 +44,7 @@ public class CredentialsPacket extends Packet {
 
     @Override
     public void writeBytes(ByteBuffer buffer) {
-        buffer.put(getSecret());
+        buffer.put(getSecret().getBytes());
         buffer.putLong(getUID());
     }
 }

Lib/src/main/java/dev/wiing/gossip/lib/packets/RegisterRequestPacket.java

@@ -1,24 +1,24 @@
 package dev.wiing.gossip.lib.packets;
 
-import dev.wiing.gossip.lib.data.StringType;
+import dev.wiing.gossip.lib.data.StringData;
 
 import java.nio.ByteBuffer;
 
-public class RegisterPacket extends Packet {
+public class RegisterRequestPacket extends Packet {
 
-    public static final short TYPE = 0x02;
+    public static final short TYPE = 0x03;
     public static final int SIZE = 0x0005;
 
-    private final StringType username = new StringType();
+    private final StringData username = new StringData();
     private byte avatarID;
 
-    public RegisterPacket() {
+    public RegisterRequestPacket() {
         super(TYPE, SIZE);
     }
 
     @Override
     public Packet readBytes(ByteBuffer buffer, int size) {
-        RegisterPacket packet = new RegisterPacket();
+        RegisterRequestPacket packet = new RegisterRequestPacket();
         packet.setLength(size);
 
         packet.username.setBytes(buffer);

Lib/src/main/java/dev/wiing/gossip/lib/packets/TestPacket.java

@@ -1,8 +1,7 @@
 package dev.wiing.gossip.lib.packets;
 
-import dev.wiing.gossip.lib.data.StringType;
+import dev.wiing.gossip.lib.data.StringData;
 
-import java.io.ByteArrayInputStream;
 import java.nio.ByteBuffer;
 
 public class TestPacket extends Packet {
@@ -10,7 +9,7 @@ public class TestPacket extends Packet {
     public static final short TYPE = 0x01;
     public static final int SIZE = 0x0000;
 
-    private final StringType message = new StringType();
+    private final StringData message = new StringData();
 
     public TestPacket() {
         super(TYPE, SIZE);

Lib/src/main/java/dev/wiing/gossip/lib/packets/TopicCreatedPacket.java

@@ -1,21 +1,21 @@
 package dev.wiing.gossip.lib.packets;
 
-import dev.wiing.gossip.lib.data.StringType;
+import dev.wiing.gossip.lib.data.StringData;
 
 import java.nio.ByteBuffer;
 
-public class TopicAddedPacket extends Packet {
+public class TopicCreatedPacket extends Packet {
 
     public static final short TYPE = 0x12;
     public static final int LENGTH = 0x014;
 
     private long topicID;
     private long hostID;
-    private final StringType topicName = new StringType();
+    private final StringData topicName = new StringData();
-    private final StringType topicDescription = new StringType();
+    private final StringData topicDescription = new StringData();
     private short topicColor;
 
-    public TopicAddedPacket() {
+    public TopicCreatedPacket() {
         super(TYPE, LENGTH);
     }
 
@@ -73,7 +73,7 @@ public class TopicAddedPacket extends Packet {
 
     @Override
     public Packet readBytes(ByteBuffer buffer, int size) {
-        TopicAddedPacket packet = new TopicAddedPacket();
+        TopicCreatedPacket packet = new TopicCreatedPacket();
         setLength(size);
 
         packet.topicID = buffer.getLong();

Lib/src/main/java/dev/wiing/gossip/lib/packets/TopicJoinPacket.java

@@ -0,0 +1,41 @@
+package dev.wiing.gossip.lib.packets;
+
+import dev.wiing.gossip.lib.data.AuthSecret;
+
+import java.nio.ByteBuffer;
+
+public class TopicJoinPacket extends AuthRequiredPacket {
+
+    public static final short TYPE = 0x13;
+    public static final int LENGTH = 0x028;
+
+    private long topicID;
+
+    public TopicJoinPacket() {
+        super(TYPE, LENGTH);
+    }
+
+    public long getTopicID() {
+        return topicID;
+    }
+
+    public void setTopicID(long topicID) {
+        this.topicID = topicID;
+    }
+
+    @Override
+    public Packet readBytes(ByteBuffer buffer, int size) {
+        TopicJoinPacket packet = new TopicJoinPacket();
+
+        packet.setAuth(new AuthSecret(buffer));
+        packet.topicID = buffer.getLong();
+
+        return packet;
+    }
+
+    @Override
+    public void writeBytes(ByteBuffer buffer) {
+        buffer.put(getAuth().getBytes());
+        buffer.putLong(topicID);
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/packets/TopicPushPacket.java

@@ -1,19 +1,19 @@
 package dev.wiing.gossip.lib.packets;
 
-import dev.wiing.gossip.lib.data.StringType;
+import dev.wiing.gossip.lib.data.AuthSecret;
+import dev.wiing.gossip.lib.data.StringData;
 
 import java.nio.ByteBuffer;
 
-public class CreateTopicPacket extends Packet {
+public class TopicPushPacket extends AuthRequiredPacket {
 
     public static final short TYPE = 0x11;
     public static final int LENGTH = 0x022;
 
-    private byte[] userSecret = new byte[32];
+    private final StringData topicName = new StringData();
-    private final StringType topicName = new StringType();
+    private final StringData topicDescription = new StringData();
-    private final StringType topicDescription = new StringType();
 
-    public CreateTopicPacket() {
+    public TopicPushPacket() {
         super(TYPE, LENGTH);
     }
 
@@ -25,14 +25,6 @@ public class CreateTopicPacket extends Packet {
         );
     }
 
-    public byte[] getUserSecret() {
-        return userSecret;
-    }
-
-    public void setUserSecret(byte[] userSecret) {
-        this.userSecret = userSecret;
-    }
-
     public String getTopicName() {
         return topicName.getValue();
     }
@@ -53,10 +45,10 @@ public class CreateTopicPacket extends Packet {
 
     @Override
     public Packet readBytes(ByteBuffer buffer, int size) {
-        CreateTopicPacket packet = new CreateTopicPacket();
+        TopicPushPacket packet = new TopicPushPacket();
         packet.setLength(size);
 
-        buffer.get(packet.userSecret);
+        packet.setAuth(new AuthSecret(buffer));
         packet.topicName.setBytes(buffer);
         packet.topicDescription.setBytes(buffer);
 
@@ -65,7 +57,7 @@ public class CreateTopicPacket extends Packet {
 
     @Override
     public void writeBytes(ByteBuffer buffer) {
-        buffer.put(userSecret);
+        buffer.put(getAuth().getBytes());
         buffer.put(topicName.getBytes());
         buffer.put(topicDescription.getBytes());
     }

Lib/src/main/java/dev/wiing/gossip/lib/packets/TopicUpdatePacket.java

@@ -0,0 +1,138 @@
+package dev.wiing.gossip.lib.packets;
+
+import dev.wiing.gossip.lib.data.ListData;
+import dev.wiing.gossip.lib.data.LongData;
+import dev.wiing.gossip.lib.data.StringData;
+
+import java.nio.ByteBuffer;
+import java.util.List;
+
+public class TopicUpdatePacket extends Packet {
+    public static final short TYPE = 0x14;
+    public static final int LENGTH = 0x009;
+
+    private long topicID;
+    private byte updateFlags = 0;
+
+    // FLAG 0b0001 == 0x1
+    public static final byte FLAG_TOPIC_NAME_UPDATED = 0b1;
+    private final StringData topicName = new StringData();
+
+    // FLAG 0b0010 == 0x2
+    public static final byte FLAG_TOPIC_DESCRIPTION_UPDATED = 0b10;
+    private final StringData topicDescription = new StringData();
+
+    // FLAG 0b0100 == 0x4
+    public static final byte FLAG_USERS_JOINED = 0b100;
+    private final ListData<LongData> usersJoined = new ListData<>(LongData::new);
+
+    // FLAG 0b1000 == 0x8
+    public static final byte FLAG_USERS_LEFT = 0b1000;
+    private final ListData<LongData> usersLeft = new ListData<>(LongData::new);
+
+    public TopicUpdatePacket() {
+        super(TYPE, LENGTH);
+    }
+
+    private void updateLength() {
+        if (!usersJoined.getData().isEmpty()) {
+            updateFlags |= FLAG_USERS_JOINED;
+        }
+        if (!usersLeft.getData().isEmpty()) {
+            updateFlags |= FLAG_USERS_LEFT;
+        }
+
+        setLength(9 +
+                (isTopicNameModified() ? topicName.getLength() : 0) +
+                (isTopicDescriptionModified() ? topicDescription.getLength() : 0) +
+                (haveUsersJoined() ? usersJoined.getLength() : 0) +
+                (haveUsersLeft() ? usersLeft.getLength() : 0));
+    }
+
+    @Override
+    public int getLength() {
+        updateLength();
+        return super.getLength();
+    }
+
+    public long getTopicID() {
+        return topicID;
+    }
+
+    public void setTopicID(long topicID) {
+        this.topicID = topicID;
+    }
+
+    public boolean isTopicNameModified() {
+        return (updateFlags & FLAG_TOPIC_NAME_UPDATED) > 0;
+    }
+
+    public boolean isTopicDescriptionModified() {
+        return (updateFlags & FLAG_TOPIC_DESCRIPTION_UPDATED) > 0;
+    }
+
+    public boolean haveUsersJoined() {
+        return (updateFlags & FLAG_USERS_JOINED) > 0;
+    }
+
+    public boolean haveUsersLeft() {
+        return (updateFlags & FLAG_USERS_LEFT) > 0;
+    }
+
+    public String getTopicName() {
+        return topicName.getValue();
+    }
+
+    public void setTopicName(String topicName) {
+        this.topicName.setValue(topicName);
+        this.updateFlags |= FLAG_TOPIC_NAME_UPDATED;
+        updateLength();
+    }
+
+    public String getTopicDescription() {
+        return topicDescription.getValue();
+    }
+
+    public void setTopicDescription(String topicDescription) {
+        this.topicDescription.setValue(topicDescription);
+        this.updateFlags |= FLAG_TOPIC_DESCRIPTION_UPDATED;
+        updateLength();
+    }
+
+    public List<LongData> getUsersJoined() {
+        return usersJoined.getData();
+    }
+
+    public List<LongData> getUsersLeft() {
+        return usersLeft.getData();
+    }
+
+    @Override
+    public Packet readBytes(ByteBuffer buffer, int size) {
+        TopicUpdatePacket packet = new TopicUpdatePacket();
+        packet.setLength(size);
+
+        packet.topicID = buffer.getLong();
+        packet.updateFlags = buffer.get();
+
+        if (packet.isTopicNameModified()) packet.topicName.setBytes(buffer);
+        if (packet.isTopicDescriptionModified()) packet.topicDescription.setBytes(buffer);
+        if (packet.haveUsersJoined()) packet.usersJoined.setBytes(buffer);
+        if (packet.haveUsersLeft()) packet.usersLeft.setBytes(buffer);
+
+        return packet;
+    }
+
+    @Override
+    public void writeBytes(ByteBuffer buffer) {
+        updateLength();
+
+        buffer.putLong(topicID);
+        buffer.put(updateFlags);
+
+        if (isTopicNameModified()) buffer.put(topicName.getBytes());
+        if (isTopicDescriptionModified()) buffer.put(topicDescription.getBytes());
+        if (haveUsersJoined()) buffer.put(usersJoined.getBytes());
+        if (haveUsersLeft()) buffer.put(usersLeft.getBytes());
+    }
+}

Lib/src/main/java/dev/wiing/gossip/lib/packets/UserDataPacket.java

@@ -1,6 +1,6 @@
 package dev.wiing.gossip.lib.packets;
 
-import dev.wiing.gossip.lib.data.StringType;
+import dev.wiing.gossip.lib.data.StringData;
 
 import java.nio.ByteBuffer;
 
@@ -10,7 +10,7 @@ public class UserDataPacket extends Packet {
     public static final int LENGTH = 0x00a;
 
     private long userID;
-    private final StringType username = new StringType();
+    private final StringData username = new StringData();
     private byte avatarID;
 
     public UserDataPacket() {

Lib/src/main/java/dev/wiing/gossip/lib/packets/UserFetchPacket.java

@@ -2,14 +2,14 @@ package dev.wiing.gossip.lib.packets;
 
 import java.nio.ByteBuffer;
 
-public class FetchUserPacket extends Packet {
+public class UserFetchPacket extends Packet {
 
     public static final short TYPE = 0x21;
     public static final int LENGTH = 0x008;
 
     private long userID;
 
-    public FetchUserPacket() {
+    public UserFetchPacket() {
         super(TYPE, LENGTH);
     }
 
@@ -23,7 +23,7 @@ public class FetchUserPacket extends Packet {
 
     @Override
     public Packet readBytes(ByteBuffer buffer, int size) {
-        FetchUserPacket packet = new FetchUserPacket();
+        UserFetchPacket packet = new UserFetchPacket();
 
         packet.userID = buffer.getLong();
 

Server/pom.xml

@@ -20,6 +20,22 @@
             <artifactId>Lib</artifactId>
             <version>1.0-SNAPSHOT</version>
         </dependency>
+
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+            <version>2.20.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+            <version>2.20.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.lmax</groupId>
+            <artifactId>disruptor</artifactId>
+            <version>3.4.4</version>
+        </dependency>
     </dependencies>
 
 </project>

Server/src/main/java/dev/wiing/gossip/server/Database.java

@@ -1,14 +1,20 @@
 package dev.wiing.gossip.server;
 
+import dev.wiing.gossip.lib.data.AuthSecret;
 import dev.wiing.gossip.lib.models.SecretUser;
 import dev.wiing.gossip.lib.models.Topic;
 import dev.wiing.gossip.lib.models.User;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 import java.net.Socket;
 import java.security.SecureRandom;
 import java.util.*;
 
 public class Database {
+
+    private static final Logger logger = LogManager.getLogger(Database.class);
+
     private int userIdCounter = 1;
     private final Map<Long, User> users = Collections.synchronizedMap(new HashMap<>());
     private final Map<String, User> usersBySecret = Collections.synchronizedMap(new HashMap<>());
@@ -31,8 +37,9 @@ public class Database {
     public SecretUser registerUser(String username, byte iconID, Socket socket) {
         SecureRandom random = new SecureRandom();
 
-        byte[] secret = new byte[32];
+        byte[] secretBytes = new byte[32];
-        random.nextBytes(secret);
+        random.nextBytes(secretBytes);
+        AuthSecret secret = new AuthSecret(secretBytes);
 
         long userID = userIdCounter++;
 
@@ -40,10 +47,10 @@ public class Database {
 
         users.put(userID, user);
         userSockets.put(userID, socket);
-        usersBySecret.put(new String(secret), user);
+        usersBySecret.put(secret.getString(), user);
         usedUsernames.add(username);
 
-        System.out.println("Created user: " + username + " #" + Long.toUnsignedString(userID));
+        logger.info("User created: \"{}\" (#{})", user.getUsername(), user.getUserID());
 
         return new SecretUser(username, iconID, userID, secret);
     }
@@ -59,8 +66,8 @@ public class Database {
                 .orElse(null);
     }
 
-    public User getUserBySecret(byte[] secret) {
+    public User getUserBySecret(AuthSecret secret) {
-        return usersBySecret.getOrDefault(secret, null);
+        return usersBySecret.getOrDefault(secret.getString(), null);
     }
 
     public Collection<User> getUsers() {
@@ -92,12 +99,14 @@ public class Database {
         userSockets.remove(user.getUserID());
 
         usedUsernames.remove(user.getUsername());
+
+        logger.info("User removed: \"{}\" (#{})", user.getUsername(), user.getUserID());
     }
 
-    public Topic createTopic(byte[] userSecret, String topicName, String topicDescription) {
+    public Topic createTopic(AuthSecret userSecret, String topicName, String topicDescription) {
-        if (!usersBySecret.containsKey(new String(userSecret))) return null;
+        if (!usersBySecret.containsKey(userSecret.getString())) return null;
 
-        User user = usersBySecret.get(new String(userSecret));
+        User user = usersBySecret.get(userSecret.getString());
 
         short colorHue = (short)Math.abs((new Random().nextInt(360)));
 
@@ -111,6 +120,8 @@ public class Database {
 
         topics.put(topic.getId(), topic);
 
+        logger.info("Topic created: \"{}\" (#{})", topic.getName(), topic.getId());
+
         return topic;
     }
 
@@ -119,6 +130,8 @@ public class Database {
     }
 
     public void removeTopic(long topicID) {
-        topics.remove(topicID);
+        Topic topic = topics.remove(topicID);
+
+        logger.info("Topic removed: \"{}\" (#{})", topic.getName(), topic.getId());
     }
 }

Server/src/main/java/dev/wiing/gossip/server/Program.java

@@ -1,8 +1,6 @@
 package dev.wiing.gossip.server;
 
 import dev.wiing.gossip.lib.Config;
-import dev.wiing.gossip.lib.packets.RegisterPacket;
-import dev.wiing.gossip.lib.packets.TestPacket;
 
 import java.io.*;
 import java.net.ServerSocket;
@@ -13,6 +11,37 @@ public class Program {
 
     public static void main(String[] args) throws IOException {
 
+//        try (FileOutputStream stream = new FileOutputStream("test.bin")) {
+//
+//            TopicUpdatePacket packet = new TopicUpdatePacket();
+//            packet.setTopicID(123456789);
+//            packet.setTopicDescription("New Name");
+//            packet.getUsersJoined().add(new LongData().setValue(696969420L));
+//            packet.getUsersJoined().add(new LongData().setValue(987654231L));
+//
+//            BufferedOutputStream out = new BufferedOutputStream(stream);
+//
+//            ByteBuffer buffer = ByteBuffer.allocate(packet.getTotalLength());
+//            buffer.putShort(packet.getType());
+//            buffer.putInt(packet.getLength());
+//            packet.writeBytes(buffer);
+//
+//            out.write(buffer.array());
+//            out.flush();
+//        }
+//
+//        try (FileInputStream stream = new FileInputStream("test.bin")) {
+//
+//            TopicUpdatePacket test = new TopicUpdatePacket();
+//
+//            BufferedInputStream in = new BufferedInputStream(stream);
+//
+//            ByteBuffer buffer = ByteBuffer.wrap(in.readAllBytes()).position(6);
+//            Packet result = test.readBytes(buffer, 0);
+//
+//            int a = 10;
+//        }
+
         Globals.getPacketManager().registerPackets();
 
         int port = Config.getPort();

Server/src/main/java/dev/wiing/gossip/server/UserSocket.java

@@ -1,9 +1,13 @@
 package dev.wiing.gossip.server;
 
+import dev.wiing.gossip.lib.data.LongData;
+import dev.wiing.gossip.lib.models.Message;
 import dev.wiing.gossip.lib.models.SecretUser;
 import dev.wiing.gossip.lib.models.Topic;
 import dev.wiing.gossip.lib.models.User;
 import dev.wiing.gossip.lib.packets.*;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 import java.io.BufferedInputStream;
 import java.io.IOException;
@@ -12,9 +16,19 @@ import java.net.SocketException;
 
 public record UserSocket(Socket socket) implements Runnable {
 
+    private static final Logger logger = LogManager.getLogger(UserSocket.class);
+
+    private void info(String message, Object ...params) {
+        logger.info(socket.getInetAddress().toString() + ":" + socket.getPort() + " > " + message, params);
+    }
+
     @Override
     public void run() {
-        while (true) {
+        info("Established");
+
+        boolean loop = true;
+
+        while (socket.isConnected() && loop) {
             try {
                 if (!socket.isConnected())
                     break;
@@ -26,22 +40,30 @@ public record UserSocket(Socket socket) implements Runnable {
                 packet.setSource(socket);
 
                 switch (packet.getType()) {
-                    case RegisterPacket.TYPE:
+                    case RegisterRequestPacket.TYPE:
-                        onRegisterUser((RegisterPacket) packet);
+                        onRegisterUser((RegisterRequestPacket) packet);
                         break;
 
-                    case CreateTopicPacket.TYPE:
+                    case TopicPushPacket.TYPE:
-                        onCreateTopic((CreateTopicPacket) packet);
+                        onCreateTopic((TopicPushPacket) packet);
                         break;
 
-                    case FetchUserPacket.TYPE:
+                    case TopicJoinPacket.TYPE:
-                        onFetchUser((FetchUserPacket) packet);
+                        onUserJoinTopic((TopicJoinPacket) packet);
+                        break;
+
+                    case UserFetchPacket.TYPE:
+                        onFetchUser((UserFetchPacket) packet);
+                        break;
+
+                    case MessagePushPacket.TYPE:
+                        onUserMessage((MessagePushPacket) packet);
                         break;
                 }
             } catch (SocketException e) {
-                break;
+                loop = false;
             } catch (IOException e) {
-                throw new RuntimeException(e);
+                logger.error(e);
             }
         }
 
@@ -50,26 +72,30 @@ public record UserSocket(Socket socket) implements Runnable {
         Database.getInstance().removeUser(user);
     }
 
-    private void onRegisterUser(RegisterPacket packet) {
+    private void onRegisterUser(RegisterRequestPacket packet) {
         SecretUser user = Database.getInstance().registerUser(packet.getUsername(), packet.getAvatarID(), packet.getSource());
 
-        CredentialsPacket creds = new CredentialsPacket();
+        info("Register as \"{}\" (#{})", user.getUsername().toUpperCase(), user.getUserID());
+
+        RegisterCredentialsPacket creds = new RegisterCredentialsPacket();
         creds.setSecret(user.getUserSecret());
         creds.setUID(user.getUserID());
 
         try {
             Globals.getPacketManager().replyPacket(packet, creds);
         } catch (IOException e) {
-            throw new RuntimeException(e);
+            logger.error(e);
         }
     }
 
-    private void onCreateTopic(CreateTopicPacket packet) {
+    private void onCreateTopic(TopicPushPacket packet) {
-        Topic topic = Database.getInstance().createTopic(packet.getUserSecret(), packet.getTopicName(), packet.getTopicDescription());
+        Topic topic = Database.getInstance().createTopic(packet.getAuth(), packet.getTopicName(), packet.getTopicDescription());
 
         if (topic == null) return;
 
-        TopicAddedPacket added = new TopicAddedPacket();
+        info("\"{}\" created topic \"{}\" (#{})", topic.getHost().getUsername().toUpperCase(), topic.getName().toUpperCase(), topic.getId());
+
+        TopicCreatedPacket added = new TopicCreatedPacket();
         added.setTopicID(topic.getId());
         added.setHostID(topic.getHost().getUserID());
         added.setTopicName(topic.getName());
@@ -82,14 +108,54 @@ public record UserSocket(Socket socket) implements Runnable {
             try {
                 Globals.getPacketManager().writePacket(socket.getOutputStream(), added);
             } catch (IOException e) {
-                e.printStackTrace();
+                logger.error(e);
             }
         }
     }
 
-    private void onFetchUser(FetchUserPacket packet) {
+    private void onUserJoinTopic(TopicJoinPacket packet) {
+        Topic topic = Database.getInstance().getTopic(packet.getTopicID());
+        User requester = Database.getInstance().getUserBySecret(packet.getAuth());
+
+        if (requester == null) return;
+        if (topic == null) return;
+
+        if (!topic.hasUser(requester)) {
+            info("\"{}\" joined topic \"{}\" (#{})", topic.getHost().getUsername().toUpperCase(), topic.getName().toUpperCase(), topic.getId());
+            topic.addUser(requester);
+        }
+
+        AckPacket resp = new AckPacket();
+        resp.setAcknowledgement(packet);
+
+        try {
+            Globals.getPacketManager().replyPacket(packet, resp);
+        } catch (IOException e) {
+            logger.error(e);
+        }
+
+        TopicUpdatePacket updatePacket = new TopicUpdatePacket();
+        updatePacket.setTopicID(topic.getId());
+        updatePacket.getUsersJoined().add(new LongData().setValue(requester.getUserID()));
+
+        for (User user : Database.getInstance().getUsers()) {
+            Socket socket = Database.getInstance().getUserSocket(user.getUserID());
+
+            try {
+                Globals.getPacketManager().writePacket(socket.getOutputStream(), updatePacket);
+            } catch (IOException e) {
+                logger.error(e);
+            }
+        }
+    }
+
+    private void onFetchUser(UserFetchPacket packet) {
         User user = Database.getInstance().getUserByID(packet.getUserID());
 
+        if (user == null) return;
+
+        info("Requested user #{}", user.getUserID());
+
         UserDataPacket resp = new UserDataPacket();
         resp.setUserID(user.getUserID());
         resp.setUsername(user.getUsername());
@@ -98,7 +164,45 @@ public record UserSocket(Socket socket) implements Runnable {
         try {
             Globals.getPacketManager().replyPacket(packet, resp);
         } catch (IOException e) {
-            throw new RuntimeException(e);
+            logger.error(e);
+        }
+    }
+
+    private void onUserMessage(MessagePushPacket packet) {
+        Topic topic = Database.getInstance().getTopic(packet.getTopicID());
+        User user = Database.getInstance().getUserBySecret(packet.getAuth());
+
+        if (user == null) return;
+        if (topic == null) return;
+
+        Message message = new Message(user, topic, packet.getMessage());
+
+        topic.addMessage(message);
+
+        info("\"{}\" in \"{}\" sends \"{}\"", user.getUsername().toUpperCase(), topic.getName().toUpperCase(), packet.getMessage());
+
+        AckPacket ack = new AckPacket();
+        ack.setAcknowledgement(packet);
+
+        try {
+            Globals.getPacketManager().replyPacket(packet, ack);
+        } catch (IOException e) {
+            logger.error(e);
+        }
+
+        MessageCreatedPacket messageCreated = new MessageCreatedPacket();
+        messageCreated.setAuthorID(user.getUserID());
+        messageCreated.setTopicID(topic.getId());
+        messageCreated.setContents(message.getContents());
+
+        for (User babbler : topic.getUsersReadOnly().values()) {
+            Socket userSocket = Database.getInstance().getUserSocket(babbler.getUserID());
+
+            try {
+                Globals.getPacketManager().writePacket(userSocket.getOutputStream(), messageCreated);
+            } catch (IOException e) {
+                logger.error(e);
+            }
         }
     }
 

Server/src/main/java/module-info.java

@@ -1,3 +1,6 @@
 module dev.wiing.gossip.server {
     requires dev.wiing.gossip.lib;
+    requires org.apache.logging.log4j;
+
+    opens dev.wiing.gossip.server to org.apache.logging.log4j;
 }

Server/src/main/resources/log4j2.xml

@@ -0,0 +1,12 @@
+<Configuration name="GossipServer" packages="">
+    <Appenders>
+        <Console name="stdout" target="SYSTEM_OUT">
+            <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss} %c{1} %highlight{ %p } %m%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="stdout"/>
+        </Root>
+    </Loggers>
+</Configuration>