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$messages = array(
              'email.required' => 'E-mail cannot be left blank.',
              'password.required' => 'Password cannot be left blank.',
          );

          $validator = Validator::make($request->all(),
          [
              "password"=>"required",
              "email"=>"required",
          ],$messages);

          if ($validator->fails()) {
              $fails=array_values($validator->getMessageBag()->toArray())[0];
              $error = $fails[0];
              Format::$message = $error;
              return Format::withoutData();
          }
          $user = User::where('email', $request->email)->first();
          if (!$user) {
            Format::$message = 'Email or password wrong!';
            return Format::withoutData();
          }
          $bcrypt = new Bcrypt();
          if ($bcrypt->check_password($request->password, $user->password)) {
            $token = $user->createToken('auth_token')->plainTextToken;
            Format::$message = 'Successfully login';
            Format::$data = $token;
            return Format::withoutData();
          } else {
              Format::$message = 'Email or password wrong!';
              return Format::withoutData();
          }