add another check before generating a token for the used email

handlers/google_auth.go

@@ -228,7 +228,13 @@ func GoogleCallback(w http.ResponseWriter, r *http.Request) {
 		helper.RespondWithError(w, http.StatusBadGateway, "Error checking email in database")
 		return
 	}
-	helper.LogError(fmt.Errorf("%v", emailExists), "Email exists in DB")
+
+	if !emailExists {
+		helper.LogError(errors.New("email not found"), "Email not registered: "+email)
+		helper.RespondWithError(w, http.StatusUnauthorized, "Email not registered. Please contact the administrator.")
+		return
+	}
+
 	accessToken, refreshToken, err := GenerateTokens(email, userAgent, ipAddress)
 	if err != nil {
 		helper.LogError(err, "Error generating access token")