Add file saving support to NotificationServer

- Implement file saving to disk in `NotificationServer` with optional UUID-based organization.
- Use `Config` to configure `DOWNLOAD_DIR` and `PORT` for better flexibility.
- Update HTTP responses for improved clarity on file download and save operations.

src/main/java/com/alttd/webinterface/WebInterface.java

@@ -21,7 +21,7 @@ import lombok.extern.slf4j.Slf4j;
 public class WebInterface {
     private final ProxyServer server;
     private NotificationServer notificationServer;
-    private static final int HTTP_PORT = 8080; // Default port, could be made configurable
+    private static final int HTTP_PORT = Config.PORT;
 
     @Inject
     public WebInterface(ProxyServer proxyServer) {

src/main/java/com/alttd/webinterface/config/Config.java

@@ -214,4 +214,14 @@ public final class Config {
         DOWNLOAD_ENDPOINT = getString("download-endpoint", DOWNLOAD_ENDPOINT);
         LOGIN_CODE_ENDPOINT = getString("login-code-endpoint", LOGIN_CODE_ENDPOINT);
     }
+
+    public static int PORT = 8080;
+    private static void web_server() {
+        PORT = getInt("web-server.port", PORT);
+    }
+
+    public static String DOWNLOAD_DIR = "/mnt/configs/AltitudeParticles/particles";
+    private static void download_dir() {
+        DOWNLOAD_DIR = getString("download-dir", DOWNLOAD_DIR);
+    }
 }

src/main/java/com/alttd/webinterface/http/NotificationServer.java

@@ -1,15 +1,19 @@
 package com.alttd.webinterface.http;
 
+import com.alttd.webinterface.config.Config;
 import com.alttd.webinterface.web_interact.FileDownloadService;
 import io.javalin.Javalin;
 import io.javalin.http.Context;
 import io.javalin.http.HttpStatus;
 import lombok.extern.slf4j.Slf4j;
 
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.Optional;
 import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
 
 /**
  * HTTP server that exposes the /notify/<file>.json endpoint.
@@ -101,8 +105,25 @@ public class NotificationServer {
     private void downloadFile(Context ctx, CompletableFuture<Optional<byte[]>> optionalCompletableFuture) {
         optionalCompletableFuture.thenAccept(fileData -> {
             if (fileData.isPresent()) {
-                ctx.contentType("application/json");
-                ctx.result(fileData.get());
+                String fileName = ctx.pathParam("file") + ".json";
+                String uuid = null;
+                try {
+                    uuid = ctx.pathParam("uuid");
+                } catch (Exception ignored) {
+                    log.debug("UUID not present");
+                }
+
+                boolean saved = saveFileToDisk(fileData.get(), fileName, uuid);
+
+                if (saved) {
+                    ctx.status(HttpStatus.OK);
+                    ctx.contentType("text/plain");
+                    ctx.result("File downloaded and saved successfully");
+                } else {
+                    ctx.status(HttpStatus.INTERNAL_SERVER_ERROR);
+                    ctx.contentType("text/plain");
+                    ctx.result("Failed to save file to disk");
+                }
             } else {
                 ctx.status(HttpStatus.NOT_FOUND);
                 ctx.contentType("text/plain");
@@ -116,4 +137,34 @@ public class NotificationServer {
             return null;
         });
     }
+
+    /**
+     * Saves the downloaded file to disk.
+     *
+     * @param fileData The binary content of the file
+     * @param fileName The name of the file
+     * @param uuid Optional UUID for organizing files
+     * @return true if the file was saved successfully, false otherwise
+     */
+    private boolean saveFileToDisk(byte[] fileData, String fileName, String uuid) {
+        try {
+            Path basePath = Paths.get(Config.DOWNLOAD_DIR);
+
+            Path filePath;
+            if (uuid != null) {
+                filePath = basePath.resolve(uuid).resolve(fileName);
+            } else {
+                filePath = basePath.resolve(fileName);
+            }
+
+            Files.createDirectories(filePath.getParent());
+            Files.write(filePath, fileData);
+
+            log.info("File saved to: {}", filePath.toAbsolutePath());
+            return true;
+        } catch (IOException e) {
+            log.error("Error saving file to disk", e);
+            return false;
+        }
+    }
 }