Added option to disable attachments and groups on both client and server

client/src/main/java/envoy/client/net/Client.java

@@ -164,6 +164,13 @@ public final class Client implements Closeable {
 		// Process ProfilePicChanges
 		receiver.registerProcessor(ProfilePicChange.class, eventBus::dispatch);
 
+		// Process requests to not send anymore attachments as they will not be shown to
+		// other users
+		receiver.registerProcessor(NoAttachments.class, eventBus::dispatch);
+
+		// Process group creation rejections - they have been disabled on the server
+		receiver.registerProcessor(GroupCreationResult.class, eventBus::dispatch);
+
 		// Send event
 		eventBus.register(SendEvent.class, evt -> {
 			try {

client/src/main/java/envoy/client/net/Receiver.java

@@ -69,7 +69,7 @@ public final class Receiver extends Thread {
 					// Server has stopped sending, i.e. because he went offline
 					if (len == 0 && bytesRead == -1) {
 						isAlive = false;
-						logger.log(Level.WARNING, "Lost connection to the server. Exiting receiver");
+						logger.log(Level.INFO, "Lost connection to the server. Exiting receiver...");
 						continue;
 					}
 					logger.log(Level.WARNING,

client/src/main/java/envoy/client/ui/controller/ChatScene.java

@@ -87,6 +87,12 @@ public final class ChatScene implements Restorable {
 	@FXML
 	private Button rotateButton;
 
+	@FXML
+	private Button messageSearchButton;
+
+	@FXML
+	private Button newGroupButton;
+
 	@FXML
 	private TextArea messageTextArea;
 
@@ -108,9 +114,6 @@ public final class ChatScene implements Restorable {
 	@FXML
 	private Label topBarStatusLabel;
 
-	@FXML
-	private Button messageSearchButton;
-
 	@FXML
 	private ImageView clientProfilePic;
 
@@ -129,7 +132,8 @@ public final class ChatScene implements Restorable {
 	private AudioRecorder	recorder;
 	private boolean			recording;
 	private Attachment		pendingAttachment;
-	private boolean			postingPermanentlyDisabled;
+
+	private boolean postingPermanentlyDisabled;
 
 	private final SystemCommandsMap messageTextAreaCommands = new SystemCommandsMap();
 
@@ -237,6 +241,21 @@ public final class ChatScene implements Restorable {
 					break;
 			}
 		});
+
+		// Disable attachment button if server says attachments will be filtered out
+		eventBus.register(NoAttachments.class, e -> {
+			Platform.runLater(() -> {
+				attachmentButton.setDisable(true);
+				voiceButton.setDisable(true);
+				final var alert = new Alert(AlertType.ERROR);
+				alert.setTitle("No attachments possible");
+				alert.setHeaderText("Your current server does not support attachments.");
+				alert.setContentText("If this is unplanned, please contact your server administrator.");
+				alert.showAndWait();
+			});
+		});
+
+		eventBus.register(GroupCreationResult.class, e -> Platform.runLater(() -> { newGroupButton.setDisable(!e.get()); }));
 	}
 
 	/**

client/src/main/java/envoy/client/ui/controller/ContactSearchScene.java

@@ -6,10 +6,8 @@ import java.util.logging.Logger;
 
 import javafx.application.Platform;
 import javafx.fxml.FXML;
-import javafx.scene.control.Alert;
+import javafx.scene.control.*;
 import javafx.scene.control.Alert.AlertType;
-import javafx.scene.control.ButtonType;
-import javafx.scene.control.ListView;
 
 import envoy.client.data.LocalDB;
 import envoy.client.event.SendEvent;
@@ -20,6 +18,7 @@ import envoy.client.ui.listcell.ListCellFactory;
 import envoy.data.User;
 import envoy.event.ElementOperation;
 import envoy.event.EventBus;
+import envoy.event.GroupCreationResult;
 import envoy.event.contact.ContactOperation;
 import envoy.event.contact.UserSearchRequest;
 import envoy.event.contact.UserSearchResult;
@@ -50,6 +49,9 @@ public final class ContactSearchScene {
 	@FXML
 	private ListView<User> userList;
 
+	@FXML
+	private Button newGroupButton;
+
 	private SceneContext sceneContext;
 
 	private LocalDB localDB;
@@ -86,6 +88,7 @@ public final class ContactSearchScene {
 		eventBus.register(UserSearchResult.class,
 				response -> Platform.runLater(() -> { userList.getItems().clear(); userList.getItems().addAll(response.get()); }));
 		eventBus.register(ContactOperation.class, handler);
+		eventBus.register(GroupCreationResult.class, e -> Platform.runLater(() -> { newGroupButton.setDisable(!e.get()); }));
 	}
 
 	/**

client/src/main/java/envoy/client/ui/controller/GroupCreationScene.java

@@ -21,6 +21,7 @@ import envoy.data.Group;
 import envoy.data.User;
 import envoy.event.EventBus;
 import envoy.event.GroupCreation;
+import envoy.event.GroupCreationResult;
 import envoy.util.Bounds;
 
 /**
@@ -54,6 +55,8 @@ public final class GroupCreationScene {
 
 	private LocalDB localDB;
 
+	private String groupName;
+
 	private static final EventBus eventBus = EventBus.getInstance();
 
 	@FXML
@@ -61,6 +64,18 @@ public final class GroupCreationScene {
 		userList.setCellFactory(new ListCellFactory<>(ContactControl::new));
 		userList.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
 		groupNameField.setClearButtonListener(e -> { groupNameField.getTextField().clear(); createButton.setDisable(true); });
+		eventBus.register(GroupCreationResult.class, e -> Platform.runLater(() -> {
+			if (e.get()) new Alert(AlertType.INFORMATION, String.format("Group '%s' successfully created.", groupName)).showAndWait();
+			else {
+				createButton.setDisable(true);
+				final var alert = new Alert(AlertType.ERROR);
+				alert.setTitle("Groups are not allowed");
+				alert.setHeaderText("Cannot create group as your current server disabled this feature");
+				alert.setContentText("If this is unplanned, please contact your server administrator.");
+				alert.showAndWait();
+				sceneContext.pop();
+			}
+		}));
 	}
 
 	/**
@@ -119,10 +134,7 @@ public final class GroupCreationScene {
 			alert.setTitle("Create Group?");
 			alert.setHeaderText("Proceed?");
 			alert.showAndWait().filter(btn -> btn == ButtonType.OK).ifPresent(btn -> createGroup(name));
-		} else {
-			new Alert(AlertType.INFORMATION, String.format("Group '%s' successfully created.", name)).showAndWait();
-			createGroup(name);
-		}
+		} else createGroup(name);
 	}
 
 	/**
@@ -133,9 +145,9 @@ public final class GroupCreationScene {
 	 * @since Envoy Client v0.1-beta
 	 */
 	private void createGroup(String name) {
+		groupName = name;
 		eventBus.dispatch(new SendEvent(
 				new GroupCreation(name, userList.getSelectionModel().getSelectedItems().stream().map(User::getID).collect(Collectors.toSet()))));
-		sceneContext.pop();
 	}
 
 	/**

client/src/main/resources/fxml/ChatScene.fxml

@@ -62,7 +62,7 @@
                               <Insets />
                            </HBox.margin>
       						</Button>
-                        <Button mnemonicParsing="false" prefWidth="100.0" text="New Group">
+                        <Button fx:id="newGroupButton" mnemonicParsing="false" prefWidth="100.0" text="New Group">
                            <HBox.margin>
                               <Insets />
                            </HBox.margin>

client/src/main/resources/fxml/ContactSearchScene.fxml

@@ -34,7 +34,7 @@
 							wrapText="true" />
 					</tooltip>
 				</ClearableTextField>
-				<Button mnemonicParsing="false"
+				<Button fx:id="newGroupButton" mnemonicParsing="false"
 					onAction="#newGroupButtonClicked" prefHeight="26.0"
 					prefWidth="139.0" text="New Group">
 					<HBox.margin>

common/src/main/java/envoy/event/GroupCreationResult.java

@@ -0,0 +1,25 @@
+package envoy.event;
+
+/**
+ * Used to communicate with a client that his request to create a group might
+ * have been rejected as it might be disabled on his current server.
+ * <p>
+ * Project: <strong>common</strong><br>
+ * File: <strong>GroupCreationResult.java</strong><br>
+ * Created: <strong>22.08.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Common v0.2-beta
+ */
+public class GroupCreationResult extends Event<Boolean> {
+
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * Creates a new {@code GroupCreationResult}.
+	 *
+	 * @param success whether the GroupCreation sent before was successful
+	 * @since Envoy Common v0.2-beta
+	 */
+	public GroupCreationResult(boolean success) { super(success); }
+}

common/src/main/java/envoy/event/NoAttachments.java

@@ -0,0 +1,25 @@
+package envoy.event;
+
+/**
+ * This event is used so that the server can tell the client that attachments
+ * will be filtered out.
+ * <p>
+ * Project: <strong>common</strong><br>
+ * File: <strong>NoAttachments.java</strong><br>
+ * Created: <strong>22.08.2020</strong><br>
+ *
+ * @author Leon Hofmeister
+ * @since Envoy Common v0.2-beta
+ */
+public class NoAttachments extends Event<Void> {
+
+	private static final long serialVersionUID = 1L;
+
+	/**
+	 * Creates a new {@code NoAttachments}.
+	 *
+	 * @since Envoy Common v0.2-beta
+	 */
+	public NoAttachments() { super(null); }
+
+}

server/src/main/java/envoy/server/data/Message.java

@@ -1,6 +1,7 @@
 package envoy.server.data;
 
 import static envoy.data.Message.MessageStatus.*;
+import static envoy.server.Startup.config;
 
 import java.time.Instant;
 
@@ -104,7 +105,7 @@ public class Message {
 		sender			= persistenceManager.getUserByID(message.getSenderID());
 		recipient		= persistenceManager.getContactByID(message.getRecipientID());
 		forwarded		= message.isForwarded();
-		if (message.hasAttachment()) {
+		if (config.isAttachmentSupportEnabled() && message.hasAttachment()) {
 			final var messageAttachment = message.getAttachment();
 			attachment		= messageAttachment.getData();
 			attachmentName	= messageAttachment.getName();

server/src/main/java/envoy/server/data/ServerConfig.java

@@ -33,6 +33,8 @@ public final class ServerConfig extends Config {
 		put("featureLabel", "l-f", identity(), true);
 		// enabling/ disabling several processors
 		put("enableIssueReporting", "e-ir", Boolean::parseBoolean, true);
+		put("enableGroups", "e-g", Boolean::parseBoolean, true);
+		put("enableAttachments", "e-a", Boolean::parseBoolean, true);
 	}
 
 	/**
@@ -47,6 +49,18 @@ public final class ServerConfig extends Config {
 	 */
 	public Boolean isIssueReportingEnabled() { return (Boolean) items.get("enableIssueReporting").get(); }
 
+	/**
+	 * @return {@code true} if attachment support has been enabled
+	 * @since Envoy Client v0.3-alpha
+	 */
+	public Boolean isAttachmentSupportEnabled() { return (Boolean) items.get("enableAttachments").get(); }
+
+	/**
+	 * @return {@code true} if group support has been enabled
+	 * @since Envoy Client v0.3-alpha
+	 */
+	public Boolean isGroupSupportEnabled() { return (Boolean) items.get("enableGroups").get(); }
+
 	/**
 	 * @return the URL where issues should be uploaded to
 	 * @since Envoy Client v0.1-alpha

server/src/main/java/envoy/server/processors/GroupCreationProcessor.java

@@ -1,9 +1,12 @@
 package envoy.server.processors;
 
+import static envoy.server.Startup.config;
+
 import java.util.HashSet;
 
 import envoy.event.ElementOperation;
 import envoy.event.GroupCreation;
+import envoy.event.GroupCreationResult;
 import envoy.event.contact.ContactOperation;
 import envoy.server.data.Contact;
 import envoy.server.data.PersistenceManager;
@@ -25,7 +28,10 @@ public final class GroupCreationProcessor implements ObjectProcessor<GroupCreati
 
 	@Override
 	public void process(GroupCreation groupCreation, long socketID, ObjectWriteProxy writeProxy) {
-		envoy.server.data.Group group = new envoy.server.data.Group();
+		// Don't allow the creation of groups if manually disabled
+		writeProxy.write(socketID, new GroupCreationResult(config.isGroupSupportEnabled()));
+		if (!config.isGroupSupportEnabled()) return;
+		final envoy.server.data.Group group = new envoy.server.data.Group();
 		group.setName(groupCreation.get());
 		group.setContacts(new HashSet<>());
 		groupCreation.getInitialMemberIDs().stream().map(persistenceManager::getUserByID).forEach(group.getContacts()::add);

server/src/main/java/envoy/server/processors/GroupMessageProcessor.java

@@ -1,6 +1,7 @@
 package envoy.server.processors;
 
 import static envoy.data.Message.MessageStatus.*;
+import static envoy.server.Startup.config;
 
 import java.time.Instant;
 import java.util.Collections;
@@ -10,6 +11,7 @@ import javax.persistence.EntityExistsException;
 
 import envoy.data.GroupMessage;
 import envoy.event.MessageStatusChange;
+import envoy.event.NoAttachments;
 import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
@@ -47,17 +49,29 @@ public final class GroupMessageProcessor implements ObjectProcessor<GroupMessage
 			writeProxy.write(socketID, new MessageStatusChange(groupMessage));
 		}
 
+		// message attachment will be automatically removed if disabled in config
+		final var groupMessageServer = new envoy.server.data.GroupMessage(groupMessage, Instant.now());
+		// Telling the server to reload the message without the attachment and telling
+		// the client not to send anymore attachments
+		if (!config.isAttachmentSupportEnabled() && groupMessage.hasAttachment()) {
+			groupMessage = groupMessageServer.toCommon();
+			writeProxy.write(socketID, new NoAttachments());
+		}
+
+		// This is needed unfortunately because of f***ing lambda restrictions ("must be
+		// fINaL oR EFfEcTivELy FiNAl")
+		final var groupMessageCopy = groupMessage;
 		// Deliver the message to the recipients that are online
 		writeProxy.writeToOnlineContacts(
-				persistenceManager.getGroupByID(groupMessage.getRecipientID())
+				persistenceManager.getGroupByID(groupMessageCopy.getRecipientID())
 					.getContacts()
 					.stream()
-					.filter(c -> c.getID() != groupMessage.getSenderID()),
-				groupMessage);
+					.filter(c -> c.getID() != groupMessageCopy.getSenderID()),
+				groupMessageCopy);
 
 		try {
-			PersistenceManager.getInstance().addMessage(new envoy.server.data.GroupMessage(groupMessage, Instant.now()));
-		} catch (EntityExistsException e) {
+			PersistenceManager.getInstance().addMessage(groupMessageServer);
+		} catch (final EntityExistsException e) {
 			logger.warning("Received a groupMessage with an ID that already exists");
 		}
 	}

server/src/main/java/envoy/server/processors/MessageProcessor.java

@@ -1,5 +1,7 @@
 package envoy.server.processors;
 
+import static envoy.server.Startup.config;
+
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -7,6 +9,7 @@ import javax.persistence.EntityExistsException;
 
 import envoy.data.Message;
 import envoy.event.MessageStatusChange;
+import envoy.event.NoAttachments;
 import envoy.server.data.PersistenceManager;
 import envoy.server.net.ConnectionManager;
 import envoy.server.net.ObjectWriteProxy;
@@ -35,6 +38,11 @@ public final class MessageProcessor implements ObjectProcessor<Message> {
 
 		// Convert to server message
 		final var serverMessage = new envoy.server.data.Message(message);
+		// Telling the server to reload the message without the attachment
+		if (!config.isAttachmentSupportEnabled() && message.hasAttachment()) {
+			message = serverMessage.toCommon();
+			writeProxy.write(socketID, new NoAttachments());
+		}
 
 		try {
 
@@ -54,7 +62,7 @@ public final class MessageProcessor implements ObjectProcessor<Message> {
 				// Note that the exact time stamp might differ slightly
 				writeProxy.write(socketID, new MessageStatusChange(message));
 			}
-		} catch (EntityExistsException e) {
+		} catch (final EntityExistsException e) {
 			logger.log(Level.WARNING, "Received " + message + " with an ID that already exists!");
 		}
 	}

server/src/main/resources/server.properties

@@ -1,4 +1,6 @@
 enter-to-stop=true
+enableAttachments=true
+enableGroups=true
 enableIssueReporting=true
 # git.kske.dev config
 issueCreationURL=https://git.kske.dev/api/v1/repos/zdm/envoy/issues?access_token=6d8ec2a72d64cbaf6319434aa2e7caf0130701b3