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/* 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 customer
import (
"regexp"
"strings"
"net/mail"
"vidhukant.com/openbills/errors"
e "errors"
)
// NOTE: very inefficient and really really really dumb but it works
// TODO: find a better (or even a remotely good) way
func checkDuplicate(field, value string, userId uint) error {
if value != "" {
var count int64
err := db.Model(&Customer{}).
//Select("").
Where("user_id = ? and " + field + " = ?", userId, value).
Count(&count).
Error
if err != nil {
return err
}
if count > 0 {
switch(field) {
case "phone":
return errors.ErrNonUniquePhone
case "email":
return errors.ErrNonUniqueEmail
case "website":
return errors.ErrNonUniqueWebsite
default:
return e.New(field + " is not unique")
}
}
}
return nil
}
func (c *Customer) validate() error {
// trim whitespaces
c.Name = strings.TrimSpace(c.Name)
c.Gstin = strings.TrimSpace(c.Gstin)
c.ContactName = strings.TrimSpace(c.Name)
c.Phone = strings.TrimSpace(c.Phone)
c.Email = strings.TrimSpace(c.Email)
c.Website = strings.TrimSpace(c.Website)
// don't validate if GSTIN is empty
if c.Gstin != "" {
// GSTIN regex validation
match, _ := regexp.MatchString("^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[1-9A-Z]{1}Z[0-9A-Z]{1}$", c.Gstin)
if (!match) {
return errors.ErrInvalidGSTIN
}
// make sure GSTIN is unique
var count int64
err := db.Model(&Customer{}).
Select("gstin").
Where("gstin = ? and user_id = ?", c.Gstin, c.UserID).
Count(&count).
Error
if err != nil {
return err
}
if count > 0 {
return errors.ErrNonUniqueGSTIN
}
}
// don't validate email if empty
if c.Email != "" {
_, err := mail.ParseAddress(c.Email)
if err != nil {
return errors.ErrInvalidEmail
}
}
var err error
for _, i := range [][]string{{"phone", c.Phone}, {"email", c.Email}, {"website", c.Website}} {
err = checkDuplicate(i[0], i[1], c.UserID)
if err != nil {
return err
}
}
return nil
}
func checkCustomerOwnership(customerId, userId uint) error {
var customer Customer
err := db.
Select("id", "user_id").
Where("id = ?", customerId).
Find(&customer).
Error
// TODO: handle potential errors
if err != nil {
return err
}
// customer doesn't exist
if customer.ID == 0 {
return errors.ErrNotFound
}
// user doesn't own this customer
if customer.UserID != userId {
return errors.ErrForbidden
}
return nil
}
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