added Content-Disposition HTTP header for better support of download file's name

src/main/java/com/oggio88/jpacrepo/service/PacmanWebService.java

@@ -29,9 +29,7 @@ import javax.xml.bind.annotation.XmlRootElement;
 import java.io.*;
 import java.net.URI;
 import java.nio.file.Files;
-import java.util.List;
-import java.util.SortedMap;
-import java.util.TreeMap;
+import java.util.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -284,6 +282,22 @@ public class PacmanWebService
         }
     }
 
+    @POST
+    @Path("/doYouWantAny")
+    @Consumes({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
+    public Response doYouWantAny(List<String> filenames)
+    {
+        Set<String> result = new HashSet<>(filenames);
+        if(!result.isEmpty())
+        {
+            TypedQuery<String> query = em.createQuery("SELECT pkg.fileName from PkgData pkg WHERE pkg.fileName in :filenames", String.class);
+            query.setParameter("filenames", filenames);
+            Set<String> toBeRemoved = new HashSet(query.getResultList());
+            result.removeAll(toBeRemoved);
+        }
+        return Response.ok(result).build();
+    }
+
     @POST
     @Path("/upload")
     @Consumes(MediaType.APPLICATION_OCTET_STREAM)
@@ -466,7 +480,7 @@ public class PacmanWebService
                 }
             }
         };
-        return Response.ok(stream).build();
+        return Response.ok(stream).header("Content-Disposition", "attachment; filename=pkgs.tar").build();
     }
 
     private Response manageQueryResult(List<PkgData> list)