Add checks on the login and creating of user

Back/skydiveLogs-api.Business/Interface/IUserService.cs

@@ -8,6 +8,6 @@ namespace skydiveLogs_api.Business.Interface
 
         User GetById(int userId);
 
-        void AddNewUser(User user);
+        bool AddNewUser(User user);
     }
 }

Back/skydiveLogs-api.Business/UserService.cs

@@ -27,10 +27,19 @@ namespace skydiveLogs_api.Business
             return _userRepository.GetByLogin(login, EncryptPassword(password));
         }
 
-        public void AddNewUser(User newUser)
+        public bool AddNewUser(User newUser)
         {
             newUser.Password = EncryptPassword(newUser.Password);
-            _userRepository.Add(newUser);
+            var foundUser = _userRepository.GetByLogin(newUser.Login, newUser.Password);
+            var result = false;
+
+            if (foundUser == null)
+            {
+                _userRepository.Add(newUser);
+                result = true;
+            }
+
+            return result;
         }
 
         private string EncryptPassword(string password)

Back/skydiveLogs-api/Controllers/UserController.cs

@@ -72,9 +72,26 @@ namespace skydiveLogs_api.Controllers
         [AllowAnonymous]
         [HttpPost]
         [EnableCors]
-        public void Post([FromBody] UserReq value)
+        public IActionResult Post([FromBody] UserReq userToAdd)
         {
-            _userService.AddNewUser(_mapper.Map<User>(value));
+            IActionResult result;
+            var newUser = _mapper.Map<User>(userToAdd);
+            var userAdded = _userService.AddNewUser(newUser);
+
+            if (!userAdded)
+            {
+                result = BadRequest(new { message = "Error during the creation of the user." });
+            }
+            else
+            {
+                newUser.Password = null;
+                var resp = _mapper.Map<UserResp>(newUser);
+                resp.Token = CreateToken(resp);
+
+                result = Ok(resp);
+            }
+
+            return result;
         }
 
         private string CreateToken(UserResp foundUser)