Add: Simple user login/register function

pkg/database/method_user.go

@@ -0,0 +1,31 @@
+package database
+
+func (database *Database) Login(username string, password string) (*User, error) {
+	user := &User{}
+
+	// get user from database
+	err := database.stmt.getUser.QueryRow(username, password).Scan(&user.ID, &user.Username, &user.Role, &user.AvatarId)
+	if err != nil {
+		return user, err
+	}
+	return user, nil
+}
+
+func (database *Database) LoginAsAnonymous() (*User, error) {
+	user := &User{}
+
+	// get user from database
+	err := database.stmt.getAnonymousUser.QueryRow().Scan(&user.ID, &user.Username, &user.Role, &user.AvatarId)
+	if err != nil {
+		return user, err
+	}
+	return user, nil
+}
+
+func (database *Database) Register(username string, password string, usertype int64) (error) {
+	_, err := database.stmt.insertUser.Exec(username, password, usertype, 0)
+	if err != nil {
+		return err
+	}
+	return nil
+}