Added first version with auto-JRE downloading!

launcher/src/main/java/nl/andrewl/aos2_launcher/Launcher.java

@@ -17,6 +17,7 @@ public class Launcher extends Application {
 	public static final Path BASE_DIR = Path.of(System.getProperty("user.home"), ".ace-of-shades");
 	public static final Path VERSIONS_DIR = BASE_DIR.resolve("versions");
 	public static final Path PROFILES_FILE = BASE_DIR.resolve("profiles.json");
+	public static final Path JRE_PATH = BASE_DIR.resolve("jre");
 
 	@Override
 	public void start(Stage stage) throws IOException {

launcher/src/main/java/nl/andrewl/aos2_launcher/MainViewController.java

@@ -1,9 +1,5 @@
 package nl.andrewl.aos2_launcher;
 
-import com.google.gson.Gson;
-import com.google.gson.GsonBuilder;
-import com.google.gson.JsonArray;
-import com.google.gson.JsonObject;
 import javafx.application.Platform;
 import javafx.beans.binding.BooleanBinding;
 import javafx.beans.property.ObjectProperty;
@@ -15,9 +11,13 @@ import javafx.fxml.FXML;
 import javafx.scene.Node;
 import javafx.scene.control.Button;
 import javafx.scene.control.Label;
+import javafx.scene.control.ProgressBar;
+import javafx.scene.control.ProgressIndicator;
 import javafx.scene.input.MouseEvent;
 import javafx.scene.layout.VBox;
 import nl.andrewl.aos2_launcher.model.Profile;
+import nl.andrewl.aos2_launcher.model.ProfileSet;
+import nl.andrewl.aos2_launcher.model.ProgressReporter;
 import nl.andrewl.aos2_launcher.model.Server;
 import nl.andrewl.aos2_launcher.view.BindingUtil;
 import nl.andrewl.aos2_launcher.view.EditProfileDialog;
@@ -25,37 +25,32 @@ import nl.andrewl.aos2_launcher.view.ProfileView;
 import nl.andrewl.aos2_launcher.view.ServerView;
 
 import java.io.IOException;
-import java.nio.file.Files;
 import java.util.ArrayList;
 
-public class MainViewController {
+public class MainViewController implements ProgressReporter {
-	@FXML
+	@FXML public Button playButton;
-	public Button playButton;
+	@FXML public Button editProfileButton;
-	@FXML
+	@FXML public Button removeProfileButton;
-	public Button editProfileButton;
+	@FXML public VBox profilesVBox;
-	@FXML
+	@FXML public VBox serversVBox;
-	public Button removeProfileButton;
+	@FXML public Label selectedProfileLabel;
-	@FXML
+	@FXML public Label selectedServerLabel;
-	public VBox profilesVBox;
-	@FXML
-	public VBox serversVBox;
-	@FXML
-	public Label selectedProfileLabel;
-	@FXML
-	public Label selectedServerLabel;
 
-	private final ObservableList<Profile> profiles = FXCollections.observableArrayList();
+	@FXML public VBox progressVBox;
+	@FXML public Label progressLabel;
+	@FXML public ProgressBar progressBar;
+
+	private final ProfileSet profileSet = new ProfileSet();
 	private final ObservableList<Server> servers = FXCollections.observableArrayList();
 	private final ObjectProperty<Server> selectedServer = new SimpleObjectProperty<>(null);
-	private final ObjectProperty<Profile> selectedProfile = new SimpleObjectProperty<>(null);
 
 	private final ServersFetcher serversFetcher = new ServersFetcher();
 
 	@FXML
 	public void initialize() {
 		BindingUtil.mapContent(serversVBox.getChildren(), servers, ServerView::new);
-		BindingUtil.mapContent(profilesVBox.getChildren(), profiles, ProfileView::new);
+		BindingUtil.mapContent(profilesVBox.getChildren(), profileSet.getProfiles(), ProfileView::new);
-		selectedProfile.addListener((observable, oldValue, newValue) -> {
+		profileSet.selectedProfileProperty().addListener((observable, oldValue, newValue) -> {
 			if (newValue == null) {
 				selectedProfileLabel.setText("None");
 			} else {
@@ -69,16 +64,16 @@ public class MainViewController {
 				selectedServerLabel.setText(newValue.getName());
 			}
 		});
-		BooleanBinding playBind = selectedProfile.isNull().or(selectedServer.isNull());
+		BooleanBinding playBind = profileSet.selectedProfileProperty().isNull().or(selectedServer.isNull());
 		playButton.disableProperty().bind(playBind);
-		editProfileButton.disableProperty().bind(selectedProfile.isNull());
+		editProfileButton.disableProperty().bind(profileSet.selectedProfileProperty().isNull());
-		removeProfileButton.disableProperty().bind(selectedProfile.isNull());
+		removeProfileButton.disableProperty().bind(profileSet.selectedProfileProperty().isNull());
 
 		profilesVBox.addEventHandler(MouseEvent.MOUSE_CLICKED, event -> {
 			Node target = (Node) event.getTarget();
 			while (target != null) {
 				if (target instanceof ProfileView view) {
-					if (view.getProfile().equals(selectedProfile.get()) && event.isControlDown()) {
+					if (view.getProfile().equals(profileSet.getSelectedProfile()) && event.isControlDown()) {
 						selectProfile(null);
 					} else if (!event.isControlDown() && event.getClickCount() == 2) {
 						selectProfile(view);
@@ -107,7 +102,10 @@ public class MainViewController {
 			}
 			selectServer(null);
 		});
-		loadProfiles();
+		progressVBox.managedProperty().bind(progressVBox.visibleProperty());
+		progressVBox.setVisible(false);
+		profileSet.loadOrCreateStandardFile();
+		updateProfileViewSelectedClass();
 		refreshServers();
 	}
 
@@ -127,101 +125,98 @@ public class MainViewController {
 	@FXML
 	public void addProfile() {
 		EditProfileDialog dialog = new EditProfileDialog(profilesVBox.getScene().getWindow());
-		dialog.showAndWait().ifPresent(profiles::add);
+		dialog.showAndWait().ifPresent(profileSet::addNewProfile);
-		saveProfiles();
 	}
 
 	@FXML
 	public void editProfile() {
-		EditProfileDialog dialog = new EditProfileDialog(profilesVBox.getScene().getWindow(), selectedProfile.get());
+		EditProfileDialog dialog = new EditProfileDialog(profilesVBox.getScene().getWindow(), profileSet.getSelectedProfile());
 		dialog.showAndWait();
-		saveProfiles();
+		profileSet.save();
 	}
 
 	@FXML
 	public void removeProfile() {
-		if (selectedProfile.getValue() != null) {
+		profileSet.removeSelectedProfile();
-			profiles.remove(selectedProfile.getValue());
-			saveProfiles();
-		}
 	}
 
 	@FXML
 	public void play() {
-		Profile profile = this.selectedProfile.get();
+		Profile profile = profileSet.getSelectedProfile();
 		Server server = this.selectedServer.get();
-		VersionFetcher.INSTANCE.ensureVersionIsDownloaded(profile.getClientVersion())
+		SystemVersionValidator.getJreExecutablePath(this)
-				.thenAccept(path -> {
+						.thenAccept(jrePath -> {
+							VersionFetcher.INSTANCE.ensureVersionIsDownloaded(profile.getClientVersion(), this)
+									.thenAccept(clientJarPath -> {
 										try {
 											Process p = new ProcessBuilder()
-								.command("java", "-jar", path.toAbsolutePath().toString())
+													.command(
+															jrePath.toAbsolutePath().toString(),
+															"-jar",
+															clientJarPath.toAbsolutePath().toString()
+													)
 													.directory(Launcher.BASE_DIR.toFile())
 													.inheritIO()
 													.start();
+											p.wait();
 										} catch (IOException e) {
 											e.printStackTrace();
+										} catch (InterruptedException e) {
+											throw new RuntimeException(e);
 										}
 									});
+						});
 	}
 
 	private void selectProfile(ProfileView view) {
 		Profile profile = view == null ? null : view.getProfile();
-		selectedProfile.set(profile);
+		profileSet.selectProfile(profile);
+		updateProfileViewSelectedClass();
+	}
+
+	private void updateProfileViewSelectedClass() {
 		PseudoClass selectedClass = PseudoClass.getPseudoClass("selected");
 		for (var node : profilesVBox.getChildren()) {
-			node.pseudoClassStateChanged(selectedClass, false);
+			ProfileView view = (ProfileView) node;
-		}
+			view.pseudoClassStateChanged(selectedClass, view.getProfile().equals(profileSet.getSelectedProfile()));
-		if (view != null) {
-			view.pseudoClassStateChanged(selectedClass, true);
 		}
 	}
 
 	private void selectServer(ServerView view) {
 		Server server = view == null ? null : view.getServer();
 		selectedServer.set(server);
+		updateServerViewSelectedClass();
+	}
+
+	private void updateServerViewSelectedClass() {
 		PseudoClass selectedClass = PseudoClass.getPseudoClass("selected");
 		for (var node : serversVBox.getChildren()) {
-			node.pseudoClassStateChanged(selectedClass, false);
+			ServerView view = (ServerView) node;
-		}
+			view.pseudoClassStateChanged(selectedClass, view.getServer().equals(selectedServer.get()));
-		if (view != null) {
-			view.pseudoClassStateChanged(selectedClass, true);
 		}
 	}
 
-	private void loadProfiles() {
+	@Override
-		if (!Files.exists(Launcher.PROFILES_FILE)) return;
+	public void enableProgress() {
-		try (var reader = Files.newBufferedReader(Launcher.PROFILES_FILE)) {
+		Platform.runLater(() -> {
-			profiles.clear();
+			progressVBox.setVisible(true);
-			JsonArray array = new Gson().fromJson(reader, JsonArray.class);
+			progressBar.setProgress(ProgressIndicator.INDETERMINATE_PROGRESS);
-			for (var element : array) {
+			progressLabel.setText(null);
-				if (element.isJsonObject()) {
+		});
-					JsonObject obj = element.getAsJsonObject();
-					Profile profile = new Profile();
-					profile.setName(obj.get("name").getAsString());
-					profile.setDescription(obj.get("description").getAsString());
-					profile.setClientVersion(obj.get("clientVersion").getAsString());
-					profiles.add(profile);
-				}
-			}
-		} catch (IOException e) {
-			e.printStackTrace();
-		}
 	}
 
-	private void saveProfiles() {
+	@Override
-		JsonArray array = new JsonArray(profiles.size());
+	public void disableProgress() {
-		for (var profile : profiles) {
+		Platform.runLater(() -> progressVBox.setVisible(false));
-			JsonObject obj = new JsonObject();
-			obj.addProperty("name", profile.getName());
-			obj.addProperty("description", profile.getDescription());
-			obj.addProperty("clientVersion", profile.getClientVersion());
-			array.add(obj);
 	}
-		Gson gson = new GsonBuilder().setPrettyPrinting().create();
+
-		try (var writer = Files.newBufferedWriter(Launcher.PROFILES_FILE)) {
+	@Override
-			gson.toJson(array, writer);
+	public void setActionText(String text) {
-		} catch (IOException e) {
+		Platform.runLater(() -> progressLabel.setText(text));
-			e.printStackTrace();
 	}
+
+	@Override
+	public void setProgress(double progress) {
+		Platform.runLater(() -> progressBar.setProgress(progress));
 	}
 }

launcher/src/main/java/nl/andrewl/aos2_launcher/SystemVersionValidator.java

@@ -1,5 +1,21 @@
 package nl.andrewl.aos2_launcher;
 
+import nl.andrewl.aos2_launcher.model.ProgressReporter;
+import nl.andrewl.aos2_launcher.util.FileUtils;
+
+import java.io.IOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.time.Duration;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.BiPredicate;
+
 public class SystemVersionValidator {
 	private static final String os = System.getProperty("os.name").trim().toLowerCase();
 	private static final String arch = System.getProperty("os.arch").trim().toLowerCase();
@@ -15,6 +31,8 @@ public class SystemVersionValidator {
 	private static final boolean ARCH_ARM = arch.equals("arm");
 	private static final boolean ARCH_ARM32 = arch.equals("arm32");
 
+	private static final String JRE_DOWNLOAD_URL = "https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.4+8/";
+
 	public static String getPreferredVersionSuffix() {
 		if (OS_LINUX) {
 			if (ARCH_AARCH64) return "linux-aarch64";
@@ -32,4 +50,85 @@ public class SystemVersionValidator {
 		System.err.println("Couldn't determine the preferred OS/ARCH version. Defaulting to windows-amd64.");
 		return "windows-amd64";
 	}
+
+	public static CompletableFuture<Path> getJreExecutablePath(ProgressReporter progressReporter) {
+		Optional<Path> optionalExecutablePath = findJreExecutable();
+		return optionalExecutablePath.map(CompletableFuture::completedFuture)
+				.orElseGet(() -> downloadAppropriateJre(progressReporter));
+	}
+
+	public static CompletableFuture<Path> downloadAppropriateJre(ProgressReporter progressReporter) {
+		progressReporter.enableProgress();
+		progressReporter.setActionText("Downloading JRE...");
+		HttpClient httpClient = HttpClient.newBuilder().followRedirects(HttpClient.Redirect.NORMAL).build();
+		HttpRequest.Builder requestBuilder = HttpRequest.newBuilder().GET().timeout(Duration.ofMinutes(5));
+		String preferredJreName = getPreferredJreName();
+		String url = JRE_DOWNLOAD_URL + preferredJreName;
+		HttpRequest req = requestBuilder.uri(URI.create(url)).build();
+		return httpClient.sendAsync(req, HttpResponse.BodyHandlers.ofInputStream())
+				.thenApplyAsync(resp -> {
+					if (resp.statusCode() == 200) {
+						// Download sequentially, and update the progress.
+						try {
+							if (Files.exists(Launcher.JRE_PATH)) {
+								FileUtils.deleteRecursive(Launcher.JRE_PATH);
+							}
+							Files.createDirectory(Launcher.JRE_PATH);
+							Path jreArchiveFile = Launcher.JRE_PATH.resolve(preferredJreName);
+							FileUtils.downloadWithProgress(jreArchiveFile, resp, progressReporter);
+							progressReporter.setProgress(-1); // Indefinite progress.
+							progressReporter.setActionText("Unpacking JRE...");
+							ProcessBuilder pb = new ProcessBuilder().inheritIO();
+							if (OS_LINUX || OS_MAC) {
+								pb.command("tar", "-xzf", jreArchiveFile.toAbsolutePath().toString(), "-C", Launcher.JRE_PATH.toAbsolutePath().toString());
+							} else if (OS_WINDOWS) {
+								pb.command("powershell", "-command", "\"Expand-Archive -Force '" + jreArchiveFile.toAbsolutePath() + "' '" + Launcher.JRE_PATH.toAbsolutePath() + "'\"");
+							}
+							Process process = pb.start();
+							int result = process.waitFor();
+							if (result != 0) throw new IOException("Archive extraction process exited with non-zero code: " + result);
+							Files.delete(jreArchiveFile);
+							progressReporter.setActionText("Looking for java executable...");
+							Optional<Path> optionalExecutablePath = findJreExecutable();
+							if (optionalExecutablePath.isEmpty()) throw new IOException("Couldn't find java executable.");
+							progressReporter.disableProgress();
+							return optionalExecutablePath.get();
+						} catch (IOException | InterruptedException e) {
+							throw new RuntimeException(e);
+						}
+					} else {
+						throw new RuntimeException("JRE download failed: " + resp.statusCode());
+					}
+				});
+	}
+
+	private static Optional<Path> findJreExecutable() {
+		if (!Files.exists(Launcher.JRE_PATH)) return Optional.empty();
+		BiPredicate<Path, BasicFileAttributes> pred = (path, basicFileAttributes) -> {
+			String filename = path.getFileName().toString();
+			return Files.isExecutable(path) && (filename.equals("java") || filename.equals("java.exe"));
+		};
+		try (var s = Files.find(Launcher.JRE_PATH, 3, pred)) {
+			return s.findFirst();
+		} catch (IOException e) {
+			e.printStackTrace();
+			return Optional.empty();
+		}
+	}
+
+	private static String getPreferredJreName() {
+		if (OS_LINUX) {
+			if (ARCH_AARCH64) return "OpenJDK17U-jre_aarch64_linux_hotspot_17.0.4_8.tar.gz";
+			if (ARCH_AMD64) return "OpenJDK17U-jre_x64_linux_hotspot_17.0.4_8.tar.gz";
+			if (ARCH_ARM || ARCH_ARM32) return "OpenJDK17U-jre_arm_linux_hotspot_17.0.4_8.tar.gz";
+		} else if (OS_MAC) {
+			if (ARCH_AARCH64) return "OpenJDK17U-jre_aarch64_mac_hotspot_17.0.4_8.tar.gz";
+			if (ARCH_X86_64) return "OpenJDK17U-jre_x64_mac_hotspot_17.0.4_8.tar.gz";
+		} else if (OS_WINDOWS) {
+			if (ARCH_AARCH64 || ARCH_AMD64) return "OpenJDK17U-jre_x64_windows_hotspot_17.0.4_8.zip";
+			if (ARCH_X86) return "OpenJDK17U-jre_x86-32_windows_hotspot_17.0.4_8.zip";
+		}
+		System.err.println("Couldn't determine the preferred JRE version. Defaulting to x64_windows.");
+		return "OpenJDK17U-jre_x64_windows_hotspot_17.0.4_8.zip";
+	}
 }

launcher/src/main/java/nl/andrewl/aos2_launcher/VersionFetcher.java

@@ -4,6 +4,8 @@ import com.google.gson.Gson;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
 import nl.andrewl.aos2_launcher.model.ClientVersionRelease;
+import nl.andrewl.aos2_launcher.model.ProgressReporter;
+import nl.andrewl.aos2_launcher.util.FileUtils;
 
 import java.io.IOException;
 import java.io.InputStreamReader;
@@ -98,7 +100,7 @@ public class VersionFetcher {
 		}
 	}
 
-	public CompletableFuture<Path> ensureVersionIsDownloaded(String versionTag) {
+	public CompletableFuture<Path> ensureVersionIsDownloaded(String versionTag, ProgressReporter progressReporter) {
 		try (var s = Files.list(Launcher.VERSIONS_DIR)) {
 			Optional<Path> optionalFile = s.filter(f -> isVersionFile(f) && versionTag.equals(extractVersion(f)))
 					.findFirst();
@@ -106,11 +108,15 @@ public class VersionFetcher {
 		} catch (IOException e) {
 			return CompletableFuture.failedFuture(e);
 		}
-		return getRelease(versionTag)
+		progressReporter.enableProgress();
-				.thenComposeAsync(this::downloadVersion);
+		progressReporter.setActionText("Downloading client " + versionTag + "...");
+		var future = getRelease(versionTag)
+				.thenComposeAsync(release -> downloadVersion(release, progressReporter));
+		future.thenRun(progressReporter::disableProgress);
+		return future;
 	}
 
-	private CompletableFuture<Path> downloadVersion(ClientVersionRelease release) {
+	private CompletableFuture<Path> downloadVersion(ClientVersionRelease release, ProgressReporter progressReporter) {
 		System.out.println("Downloading version " + release.tag());
 		HttpRequest req = HttpRequest.newBuilder(URI.create(release.assetsUrl()))
 				.GET().timeout(Duration.ofSeconds(3)).build();
@@ -140,10 +146,19 @@ public class VersionFetcher {
 					.GET().timeout(Duration.ofMinutes(5)).build();
 			Path file = Launcher.VERSIONS_DIR.resolve(fileName);
 			System.out.printf("Downloading %s to %s.%n", fileName, file.toAbsolutePath());
-			return httpClient.sendAsync(downloadRequest, HttpResponse.BodyHandlers.ofFile(file))
+			return httpClient.sendAsync(downloadRequest, HttpResponse.BodyHandlers.ofInputStream())
 					.thenApplyAsync(resp -> {
-						System.out.println(resp);
+						if (resp.statusCode() == 200) {
-						return resp.body();
+							// Download sequentially, and update the progress.
+							try {
+								FileUtils.downloadWithProgress(file, resp, progressReporter);
+							} catch (IOException e) {
+								throw new RuntimeException(e);
+							}
+							return file;
+						} else {
+							throw new RuntimeException("Version download failed.");
+						}
 					});
 		});
 	}

launcher/src/main/java/nl/andrewl/aos2_launcher/model/Profile.java

@@ -3,15 +3,27 @@ package nl.andrewl.aos2_launcher.model;
 import javafx.beans.property.SimpleStringProperty;
 import javafx.beans.property.StringProperty;
 
+import java.util.UUID;
+
 public class Profile {
+	private final UUID id;
 	private final StringProperty name;
 	private final StringProperty description;
 	private final StringProperty clientVersion;
 
 	public Profile() {
-		this.name = new SimpleStringProperty("");
+		this(UUID.randomUUID(), "", null, null);
-		this.description = new SimpleStringProperty(null);
+	}
-		this.clientVersion = new SimpleStringProperty(null);
+
+	public Profile(UUID id, String name, String description, String clientVersion) {
+		this.id = id;
+		this.name = new SimpleStringProperty(name);
+		this.description = new SimpleStringProperty(description);
+		this.clientVersion = new SimpleStringProperty(clientVersion);
+	}
+
+	public UUID getId() {
+		return id;
 	}
 
 	public String getName() {

launcher/src/main/java/nl/andrewl/aos2_launcher/model/ProfileSet.java

@@ -0,0 +1,141 @@
+package nl.andrewl.aos2_launcher.model;
+
+import com.google.gson.*;
+import javafx.beans.property.ObjectProperty;
+import javafx.beans.property.SimpleObjectProperty;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import nl.andrewl.aos2_launcher.Launcher;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.UUID;
+
+/**
+ * Model for managing the set of profiles in the app.
+ */
+public class ProfileSet {
+	private final ObservableList<Profile> profiles;
+	private final ObjectProperty<Profile> selectedProfile;
+	private Path lastFileUsed = null;
+
+	public ProfileSet() {
+		this.profiles = FXCollections.observableArrayList();
+		this.selectedProfile = new SimpleObjectProperty<>(null);
+	}
+
+	public ProfileSet(Path file) throws IOException {
+		this();
+		load(file);
+	}
+
+	public void addNewProfile(Profile profile) {
+		profiles.add(profile);
+		selectedProfile.set(profile);
+		save();
+	}
+
+	public void removeProfile(Profile profile) {
+		if (profile == null) return;
+		boolean removed = profiles.remove(profile);
+		if (removed) {
+			if (selectedProfile.get() != null && selectedProfile.get().equals(profile)) {
+				selectedProfile.set(null);
+			}
+			save();
+		}
+	}
+
+	public void removeSelectedProfile() {
+		removeProfile(getSelectedProfile());
+	}
+
+	public void selectProfile(Profile profile) {
+		if (!profiles.contains(profile)) return;
+		selectedProfile.set(profile);
+	}
+
+	public void load(Path file) throws IOException {
+		try (var reader = Files.newBufferedReader(file)) {
+			JsonObject data = new Gson().fromJson(reader, JsonObject.class);
+			profiles.clear();
+			JsonElement selectedProfileIdElement = data.get("selectedProfileId");
+			UUID selectedProfileId = selectedProfileIdElement.isJsonNull() ? null : UUID.fromString(selectedProfileIdElement.getAsString());
+			JsonArray profilesArray = data.getAsJsonArray("profiles");
+			for (JsonElement element : profilesArray) {
+				JsonObject profileObj = element.getAsJsonObject();
+				UUID id = UUID.fromString(profileObj.get("id").getAsString());
+				String name = profileObj.get("name").getAsString();
+				String description = profileObj.get("description").getAsString();
+				String clientVersion = profileObj.get("clientVersion").getAsString();
+				Profile profile = new Profile(id, name, description, clientVersion);
+				profiles.add(profile);
+				if (selectedProfileId != null && selectedProfileId.equals(profile.getId())) {
+					selectedProfile.set(profile);
+				}
+			}
+			lastFileUsed = file;
+		}
+	}
+
+	public void loadOrCreateStandardFile() {
+		if (!Files.exists(Launcher.PROFILES_FILE)) {
+			try {
+				save(Launcher.PROFILES_FILE);
+			} catch (IOException e) {
+				throw new RuntimeException(e);
+			}
+		} else {
+			try {
+				load(Launcher.PROFILES_FILE);
+			} catch (IOException e) {
+				throw new RuntimeException(e);
+			}
+		}
+
+	}
+
+	public void save(Path file) throws IOException {
+		Gson gson = new GsonBuilder().setPrettyPrinting().create();
+		JsonObject data = new JsonObject();
+		String selectedProfileId = selectedProfile.getValue() == null ? null : selectedProfile.getValue().getId().toString();
+		data.addProperty("selectedProfileId", selectedProfileId);
+		JsonArray profilesArray = new JsonArray(profiles.size());
+		for (Profile profile : profiles) {
+			JsonObject obj = new JsonObject();
+			obj.addProperty("id", profile.getId().toString());
+			obj.addProperty("name", profile.getName());
+			obj.addProperty("description", profile.getDescription());
+			obj.addProperty("clientVersion", profile.getClientVersion());
+			profilesArray.add(obj);
+		}
+		data.add("profiles", profilesArray);
+		try (var writer = Files.newBufferedWriter(file)) {
+			gson.toJson(data, writer);
+		}
+		lastFileUsed = file;
+	}
+
+	public void save() {
+		if (lastFileUsed != null) {
+			try {
+				save(lastFileUsed);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
+	public ObservableList<Profile> getProfiles() {
+		return profiles;
+	}
+
+	public Profile getSelectedProfile() {
+		return selectedProfile.get();
+	}
+
+	public ObjectProperty<Profile> selectedProfileProperty() {
+		return selectedProfile;
+	}
+}

launcher/src/main/java/nl/andrewl/aos2_launcher/model/ProgressReporter.java

@@ -0,0 +1,8 @@
+package nl.andrewl.aos2_launcher.model;
+
+public interface ProgressReporter {
+	void enableProgress();
+	void disableProgress();
+	void setActionText(String text);
+	void setProgress(double progress);
+}

launcher/src/main/java/nl/andrewl/aos2_launcher/util/FileUtils.java

@@ -0,0 +1,74 @@
+package nl.andrewl.aos2_launcher.util;
+
+import nl.andrewl.aos2_launcher.model.ProgressReporter;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.http.HttpResponse;
+import java.nio.file.FileVisitResult;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.text.CharacterIterator;
+import java.text.StringCharacterIterator;
+
+public class FileUtils {
+	public static String humanReadableByteCountSI(long bytes) {
+		if (-1000 < bytes && bytes < 1000) {
+			return bytes + " B";
+		}
+		CharacterIterator ci = new StringCharacterIterator("kMGTPE");
+		while (bytes <= -999_950 || bytes >= 999_950) {
+			bytes /= 1000;
+			ci.next();
+		}
+		return String.format("%.1f %cB", bytes / 1000.0, ci.current());
+	}
+
+	public static String humanReadableByteCountBin(long bytes) {
+		long absB = bytes == Long.MIN_VALUE ? Long.MAX_VALUE : Math.abs(bytes);
+		if (absB < 1024) {
+			return bytes + " B";
+		}
+		long value = absB;
+		CharacterIterator ci = new StringCharacterIterator("KMGTPE");
+		for (int i = 40; i >= 0 && absB > 0xfffccccccccccccL >> i; i -= 10) {
+			value >>= 10;
+			ci.next();
+		}
+		value *= Long.signum(bytes);
+		return String.format("%.1f %ciB", value / 1024.0, ci.current());
+	}
+
+	public static void deleteRecursive(Path p) throws IOException {
+		Files.walkFileTree(p, new SimpleFileVisitor<>() {
+			@Override
+			public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+				Files.delete(file);
+				return FileVisitResult.CONTINUE;
+			}
+
+			@Override
+			public FileVisitResult postVisitDirectory(Path dir, IOException exc) throws IOException {
+				Files.delete(dir);
+				return FileVisitResult.CONTINUE;
+			}
+		});
+	}
+
+	public static void downloadWithProgress(Path outputFile, HttpResponse<InputStream> resp, ProgressReporter reporter) throws IOException {
+		reporter.setProgress(0);
+		long size = resp.headers().firstValueAsLong("Content-Length").orElse(1);
+		try (var out = Files.newOutputStream(outputFile); var in = resp.body()) {
+			byte[] buffer = new byte[8192];
+			long bytesRead = 0;
+			while (bytesRead < size) {
+				int readCount = in.read(buffer);
+				out.write(buffer, 0, readCount);
+				bytesRead += readCount;
+				reporter.setProgress((double) bytesRead / size);
+			}
+		}
+	}
+}

launcher/src/main/resources/main_view.fxml

@@ -1,51 +1,61 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
+<?import javafx.geometry.*?>
 <?import javafx.scene.control.*?>
 <?import javafx.scene.layout.*?>
-<VBox
+<?import javafx.scene.text.*?>
-        maxHeight="-Infinity"
+
-        maxWidth="-Infinity"
+<VBox maxHeight="1.7976931348623157E308" maxWidth="1.7976931348623157E308" minHeight="300.0" minWidth="300.0" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/16" xmlns:fx="http://javafx.com/fxml/1" fx:controller="nl.andrewl.aos2_launcher.MainViewController">
-        minHeight="300.0"
-        minWidth="300.0"
-        prefHeight="400.0"
-        prefWidth="600.0"
-        xmlns="http://javafx.com/javafx/16"
-        xmlns:fx="http://javafx.com/fxml/1"
-        fx:controller="nl.andrewl.aos2_launcher.MainViewController"
->
     <TabPane tabClosingPolicy="UNAVAILABLE" VBox.vgrow="ALWAYS">
         <Tab text="Profiles">
             <VBox>
-                <HBox VBox.vgrow="NEVER" alignment="CENTER" styleClass="button-bar">
+                <HBox alignment="CENTER" styleClass="button-bar" VBox.vgrow="NEVER">
-                    <Button text="Add Profile" onAction="#addProfile"/>
+                    <Button onAction="#addProfile" text="Add Profile" />
-                    <Button fx:id="editProfileButton" text="Edit Profile" onAction="#editProfile"/>
+                    <Button fx:id="editProfileButton" onAction="#editProfile" text="Edit Profile" />
-                    <Button fx:id="removeProfileButton" text="Remove Profile" onAction="#removeProfile"/>
+                    <Button fx:id="removeProfileButton" onAction="#removeProfile" text="Remove Profile" />
                 </HBox>
                 <ScrollPane fitToWidth="true" VBox.vgrow="ALWAYS">
-                    <VBox fx:id="profilesVBox" styleClass="banner-list"/>
+                    <VBox fx:id="profilesVBox" styleClass="banner-list" />
                 </ScrollPane>
             </VBox>
         </Tab>
         <Tab text="Servers">
             <VBox>
-                <HBox VBox.vgrow="NEVER" alignment="CENTER" styleClass="button-bar">
+                <HBox alignment="CENTER" styleClass="button-bar" VBox.vgrow="NEVER">
-                    <Button text="Refresh" onAction="#refreshServers"/>
+                    <Button onAction="#refreshServers" text="Refresh" />
                 </HBox>
                 <ScrollPane fitToWidth="true" VBox.vgrow="ALWAYS">
-                    <VBox fx:id="serversVBox" styleClass="banner-list"/>
+                    <VBox fx:id="serversVBox" styleClass="banner-list" />
                 </ScrollPane>
             </VBox>
         </Tab>
     </TabPane>
-    <HBox alignment="CENTER" VBox.vgrow="NEVER" styleClass="button-bar">
+    <HBox alignment="CENTER" styleClass="button-bar" VBox.vgrow="NEVER">
-        <HBox alignment="CENTER_LEFT" HBox.hgrow="NEVER" spacing="5">
+        <HBox alignment="CENTER_LEFT" spacing="5" HBox.hgrow="NEVER">
-            <Label text="Profile: "/>
+            <Label text="Profile: " />
-            <Label fx:id="selectedProfileLabel" text="None"/>
+            <Label fx:id="selectedProfileLabel" text="None" />
         </HBox>
-        <Button fx:id="playButton" mnemonicParsing="false" text="Play" onAction="#play"/>
+        <Button fx:id="playButton" mnemonicParsing="false" onAction="#play" text="Play" />
-        <HBox alignment="CENTER_LEFT" HBox.hgrow="NEVER" spacing="5">
+        <HBox alignment="CENTER_LEFT" spacing="5" HBox.hgrow="NEVER">
-            <Label text="Server: "/>
+            <Label text="Server: " />
-            <Label fx:id="selectedServerLabel" text="None"/>
+            <Label fx:id="selectedServerLabel" text="None" />
         </HBox>
     </HBox>
+   <VBox fx:id="progressVBox" VBox.vgrow="NEVER">
+      <children>
+         <AnchorPane VBox.vgrow="NEVER">
+            <children>
+               <Label fx:id="progressLabel" text="Work in progress..." AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.topAnchor="0.0">
+                  <font>
+                     <Font size="10.0" />
+                  </font>
+               </Label>
+               <ProgressBar fx:id="progressBar" prefWidth="200.0" progress="0.0" AnchorPane.bottomAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" />
+            </children>
+            <padding>
+               <Insets bottom="5.0" left="5.0" right="5.0" top="5.0" />
+            </padding>
+         </AnchorPane>
+      </children>
+   </VBox>
 </VBox>