implemented file download

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

files/src/main/java/de/srsoftware/umbrella/files/FileModule.java

@@ -29,6 +29,7 @@ import static de.srsoftware.umbrella.core.ModuleRegistry.userService;
 import static de.srsoftware.umbrella.core.exceptions.UmbrellaException.*;
 import static de.srsoftware.umbrella.files.Constants.CONFIG_DATABASE;
 import static de.srsoftware.umbrella.files.Constants.CONFIG_FILESTORE;
+import static java.net.HttpURLConnection.HTTP_OK;
 
 public class FileModule extends BaseHandler implements FileService {
 
@@ -104,9 +105,14 @@ public class FileModule extends BaseHandler implements FileService {
 
 	private boolean getFile(HttpExchange ex, File file) throws IOException {
 		var headers  = ex.getResponseHeaders();
-		//headers.add(CONTENT_TYPE, MIME_PDF);
+		var conn = file.toURI().toURL().openConnection();
+		var ct = conn.getContentType();
+		headers.add(CONTENT_TYPE, ct);
 		headers.add(CONTENT_DISPOSITION,"attachment; filename=\""+file.getName()+"\"");
-		return sendContent(ex,new FileInputStream(file));
+		ex.sendResponseHeaders(HTTP_OK, 0L);
+		new FileInputStream(file).transferTo(ex.getResponseBody());
+		return true;
+
 	}
 
 	private Map<String,Object> getDirectory(File file) throws IOException {

frontend/src/routes/files/Index.svelte

@@ -67,7 +67,7 @@
 {#each Object.entries(children.files) as [k,v]}
     <li class="file">
         <span class="symbol"></span>
-        <a href={'/files'+k} {onclick}>{v}</a>
+        <a href={'/api/files'+k} target="_blank">{v}</a>
     </li>
 {/each}
 {/if}