added Module Prototype

backend/src/main/java/com/example/backend/anwprj/Module/Module.java

@@ -0,0 +1,25 @@
+package com.example.backend.anwprj.Module;
+
+//module data class
+public class Module {
+    private final int id;
+    private final int lecturerId;
+    private final int semesterId;
+    private final String name;
+
+    public Module(int id, int userId, int semesterId, String name){
+        this.id = id;
+        this.lecturerId = userId;
+        this.semesterId = semesterId;
+        this.name = name;
+    }
+
+    public int getId() { return id; }
+
+    public int getLecturerId() { return lecturerId; }
+
+    public int getSemesterId() { return semesterId; }
+
+    public String getName() { return name; }
+
+}

backend/src/main/java/com/example/backend/anwprj/controller/ModuleController.java

@@ -0,0 +1,62 @@
+package com.example.backend.anwprj.controller;
+
+import com.example.backend.anwprj.DataBaseHandler;
+import com.example.backend.anwprj.Module.Module;
+import com.example.backend.anwprj.Users.User;
+import com.example.backend.anwprj.Users.UserSessionIDHandler;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.CrossOrigin;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class ModuleController {
+    private final DataBaseHandler db;
+
+    {
+        db = DataBaseHandler.getInstance();
+    }
+
+    @CrossOrigin
+    @GetMapping("placeholder")
+    public ResponseEntity<Module> getModule(
+            @RequestParam(name="id") int id,
+            @RequestParam(name="sessionid") String sessionID) {
+
+        User user = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if (user != null){
+            Module module = db.getModule(id);
+            if(module != null) {
+                return new ResponseEntity<>(module, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+
+    @CrossOrigin
+    @GetMapping("placeholder")
+    public ResponseEntity<Module> getModule(
+            @RequestParam(name="name") String name,
+            @RequestParam(name="sessionid") String sessionID) {
+
+        User user = UserSessionIDHandler.getUserBySessionID(sessionID);
+
+        if(user != null)
+        {
+            Module module = db.getModule(name);
+            if (module != null) {
+                return new ResponseEntity<>(module, HttpStatus.OK);
+            }
+
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+
+        return new ResponseEntity<>(HttpStatus.FORBIDDEN);
+    }
+}