1 files changed, 71 insertions, 0 deletions
diff --git a/invoice/validators.go b/invoice/validators.go
new file mode 100644
index 0000000..645bdff
--- /dev/null
+++ b/invoice/validators.go
@@ -0,0 +1,71 @@
+/* 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 invoice
+
+import (
+	//"regexp"
+	//"strings"
+	//"net/mail"
+	//"net/url"
+	"vidhukant.com/openbills/errors"
+	//e "errors"
+)
+
+func (i *Invoice) validate() error {
+	var count int64
+	err := db.Model(&Invoice{}).
+		Where("user_id = ? and invoice_number = ?", i.UserID, i.InvoiceNumber).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+	}
+
+	if count > 0 {
+		return errors.ErrNonUniqueInvoiceNumber
+	}
+
+	return nil
+}
+
+func checkInvoiceOwnership(invoiceId, userId uint) error {
+	var invoice Invoice
+	err := db.
+		Select("id", "user_id").
+		Where("id = ?", invoiceId).
+		Find(&invoice).
+		Error
+
+	// TODO: handle potential errors
+	if err != nil {
+		return err
+  }
+
+	// invoice doesn't exist
+	if invoice.ID == 0 {
+		return errors.ErrNotFound
+	}
+
+	// user doesn't own this invoice
+	if invoice.UserID != userId {
+		return errors.ErrForbidden
+	}
+
+	return nil
+}