"""
Paramecio2fm is a series of wrappers for Flask, mako and others and construct a simple headless cms.

Copyright (C) 2023 Antonio de la Rosa Caballero

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero 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 Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""

from paramecio2.libraries.db.corefields import PhangoField
from paramecio2.libraries.db.coreforms import PasswordForm
from hmac import compare_digest as compare_hash
#import crypt
import re

class UserNameField(PhangoField):
    
    """Field for save and check usernames"""
    
    def check(self, value):
        
        if not re.match("^[A-Za-z0-9_-]+$", value):
            self.txt_error='Error: use only letters, numbers, underscores and dashes for this field'
            self.error=1
            value=''
            
        return value