added sign-in

1 files changed, 87 insertions, 0 deletions

diff --git a/user/validators.go b/user/validators.go
new file mode 100644
index 0000000..88239c6
--- /dev/null
+++ b/user/validators.go
@@ -0,0 +1,87 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package user
+
+import (
+	"strings"
+	e "errors"
+	"github.com/spf13/viper"
+	"vidhukant.com/openbills/errors"
+)
+
+func validatePassword(pass string) error {
+	// check if password is too short
+	if len(pass) < viper.GetInt("security.min_password_length") {
+		return errors.ErrPasswordTooShort
+	}
+
+	// check if password is too long
+	if len(pass) > viper.GetInt("security.max_password_length") {
+		return errors.ErrPasswordTooLong
+	}
+
+	return nil
+}
+
+// NOTE: very inefficient and really really really dumb but it works
+// TODO: find a better (or even a remotely good) way
+func validateUserField(field, value string) error {
+	if value != "" {
+		var count int64
+		err := db.Model(&User{}).
+			Where(field + " = ?", value).
+			Count(&count).
+			Error
+
+		if err != nil {
+			return err
+		}
+
+		if count > 0 {
+			switch(field) {
+			case "username":
+				return errors.ErrNonUniqueUsername
+			case "email":
+				return errors.ErrNonUniqueEmail
+			default:
+				return e.New(field + " is not unique")
+			}
+		}
+	}
+
+	return nil
+}
+
+func (u *User) validate() error {
+	u.Username = strings.TrimSpace(u.Username)
+	u.Email = strings.TrimSpace(u.Email)
+	u.IsVerified = false
+
+	// TODO: validate username length and stuff
+	// TODO: validate if email is valid
+
+	var err error
+	for _, i := range [][]string{{"username", u.Username}, {"email", u.Email}} {
+		err = validateUserField(i[0], i[1])
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}