add TaskUserPair

service/src/main/java/api/TasksResource.java

 package api;
 
+import helpers.TaskUserPair;
 import io.dropwizard.auth.Auth;
 import objects.Task;
 import objects.User;
 import repositories.TasksRepository;
 
 import javax.inject.Inject;
+import javax.validation.Valid;
 import javax.ws.rs.*;
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
@@ -39,20 +41,26 @@ public class TasksResource
     }
 
     //todo: merge with upper
-    //todo: user argument
     //todo: pass username in header via proxy?
-    //todo: post
-    @GET
-    @Path("flags/{task_id}")
-    public Response getUserTaskFlag(final @PathParam("task_id") String taskId) {
-        String temporaryUserName = "gpietrus1";
-        Optional<String> userTaskFlag = tasksRepository.getUserTaskFlag(temporaryUserName, taskId);//todo
+    @POST
+    //todo: authorization
+    @Path("/flags/user_task_flag")
+    @Consumes(MediaType.APPLICATION_JSON)
+    public Response getUserTaskFlag(@Valid final TaskUserPair taskUserPair) {
+        Optional<String> userTaskFlag = tasksRepository.getUserTaskFlag(taskUserPair.getUsername(), taskUserPair.getTaskId());//todo
         if(userTaskFlag.isPresent()) {
             return Response.ok().entity(userTaskFlag.get()).build();
         }
         return Response.status(Response.Status.BAD_REQUEST).build();
     }
 
+//    example json:
+//    {
+//        "username": "gpietrus2",
+//            "taskId": "abb6b014-1ee0-4f53-b8df-c7029335c070"
+//    }
+
+
     @POST
     public boolean submitSolution(@Auth User user,
                                   String flag) throws Exception {

service/src/main/java/helpers/TaskUserPair.java

+package helpers;
+
+import org.hibernate.validator.constraints.NotEmpty;
+
+/**
+ * Created by gpietrus on 22.02.2016.
+ */
+public class TaskUserPair {
+
+    @NotEmpty
+    private String taskId;
+
+    @NotEmpty
+    private String username;
+
+    public String getTaskId() {
+        return taskId;
+    }
+
+    public void setTaskId(String taskId) {
+        this.taskId = taskId;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+}