Add json config support

build.gradle

@@ -24,6 +24,7 @@ dependencies {
     implementation 'org.xerial:sqlite-jdbc:3.32.3'
     implementation 'org.kordamp.ikonli:ikonli-javafx:12.0.0'
     implementation 'org.kordamp.ikonli:ikonli-fontawesome5-pack:12.0.0'
+    implementation 'org.json:json:20201115'
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.7.0")
     testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.7.0")
     compile 'com.jfoenix:jfoenix:9.0.10'

config.json

@@ -0,0 +1,3 @@
+{
+  "serveur" :"test"
+}

src/main/java/fr/insa/clavardator/ui/MainController.java

@@ -9,6 +9,7 @@ import fr.insa.clavardator.ui.dialogs.SnackbarController;
 import fr.insa.clavardator.ui.users.UserListController;
 import fr.insa.clavardator.users.CurrentUser;
 import fr.insa.clavardator.users.UserList;
+import fr.insa.clavardator.util.ConfigLoader;
 import fr.insa.clavardator.util.Log;
 import javafx.application.Platform;
 import javafx.fxml.FXML;
@@ -67,15 +68,15 @@ public class MainController implements Initializable {
 	 * @param newState The new user state
 	 */
 	private void onCurrentUserStateChange(CurrentUser.State newState) {
-			if (newState == CurrentUser.State.VALID)
-				startChat();
-			else if (newState != CurrentUser.State.UNINITIALIZED) {
-				final boolean isError = newState == CurrentUser.State.INVALID;
-				if (isError) {
-					endChat();
-				}
-				Platform.runLater(() -> showLogin(isError));
+		if (newState == CurrentUser.State.VALID)
+			startChat();
+		else if (newState != CurrentUser.State.UNINITIALIZED) {
+			final boolean isError = newState == CurrentUser.State.INVALID;
+			if (isError) {
+				endChat();
 			}
+			Platform.runLater(() -> showLogin(isError));
+		}
 	}
 
 	/**
@@ -252,14 +253,21 @@ public class MainController implements Initializable {
 	/**
 	 * Creates database if needed, then init current user, and finally load user list
 	 */
-	private void initDb() {
-		final DatabaseController db = new DatabaseController();
-		db.initTables(() -> {
-			userList.retrievedPreviousUsers(
-					() -> currentUser.init(this::onInitError),
-					this::onInitError
-			);
-		}, this::onInitError);
+	private void initBackend() {
+		ConfigLoader.load((ConfigLoader.Config config) -> {
+			final String serverUri = config.getServerUri();
+			if (serverUri != null) {
+				Log.v("INIT", "Found server URI: " + serverUri);
+			} else {
+				Log.v("INIT", "Server URI not found. Proceeding without");
+			}
+			final DatabaseController db = new DatabaseController();
+			db.initTables(
+					() -> userList.retrievedPreviousUsers(
+							() -> currentUser.init(this::onInitError),
+							this::onInitError
+					), this::onInitError);
+		});
 	}
 
 	/**
@@ -273,6 +281,6 @@ public class MainController implements Initializable {
 		listController.setUserList(userList);
 		listController.setRefreshUserListener(this::discoverActiveUsers);
 		editUserDialogController.setUserList(userList);
-		initDb();
+		initBackend();
 	}
 }

src/main/java/fr/insa/clavardator/ui/chat/MessageListItemController.java

@@ -9,6 +9,7 @@ import javafx.fxml.Initializable;
 import javafx.geometry.Pos;
 import javafx.scene.control.Label;
 import javafx.scene.layout.VBox;
+import netscape.javascript.JSObject;
 
 import java.awt.*;
 import java.io.File;

src/main/java/fr/insa/clavardator/util/ConfigLoader.java

@@ -0,0 +1,59 @@
+package fr.insa.clavardator.util;
+
+import org.jetbrains.annotations.Nullable;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.json.JSONTokener;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.InputStream;
+
+public class ConfigLoader {
+
+	public static final String PATH = "config.json";
+
+	public static void load(ConfigLoadedCallback callback) {
+		new Thread(() -> {
+			try {
+				InputStream is = new FileInputStream(PATH);
+				JSONTokener tokener = new JSONTokener(is);
+				JSONObject obj = new JSONObject(tokener);
+				callback.onLoaded(new Config(obj));
+			} catch (FileNotFoundException e) {
+				Log.v("CONFIG", "No config file found");
+				callback.onLoaded(new Config());
+			} catch (JSONException e) {
+				Log.v("CONFIG", "Could not read config file. Please make sure it is a valid JSON.");
+				callback.onLoaded(new Config());
+			}
+		}).start();
+	}
+
+	public interface ConfigLoadedCallback {
+		void onLoaded(Config config);
+	}
+
+	public static class Config {
+		@Nullable
+		private String serverUri;
+		private final String SERVER_URI_KEY = "serveur";
+
+		public Config() {
+			serverUri = null;
+		}
+
+		public Config(JSONObject obj) {
+			this();
+			System.out.println(obj);
+			if (obj.has(SERVER_URI_KEY)) {
+				serverUri = obj.getString(SERVER_URI_KEY);
+			}
+		}
+
+		public @Nullable String getServerUri() {
+			return serverUri;
+		}
+	}
+
+}