custom pydal/py4web/web2py validators

validators.py

# -*- coding: utf-8 -*-

from pydal.validators import Validator, IS_MATCH, ValidationError

class IS_NOT(Validator):
    """ A not validatro is like a not joke... NOT! """

    def __init__(self, validator, *args, error_message="Invalid expression", **kwargs):
        super(IS_NOT, self).__init__()
        self.__validator = validator(*args, **kwargs)
        self.error_message = error_message

    def validate(self, value, record_id=None):
        value_, message = self.__validator(value, record_id=None)

        if message is None:
            raise ValidationError(self.translator(self.error_message))
        else:
            return value_

class HAS_NOT_URL(IS_NOT):
    """ A validator for strings that must not contain URLs """

    # Regex courtesy of Raul ;-)
    # https://groups.google.com/g/web2py/c/nSB6LOe5NgM/m/gLsKr_SeFQAJ
    URLREGEX = '(?i)\\b((?:https?://|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}/)(?:[^\\s()<>]+|\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\))+(?:\\(([^\\s()<>]+|(\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:\'\\".,<>?«»“”‘’]))'

    def __init__(self, error_message="URL not allowed here!"):
        super(HAS_NOT_URL, self).__init__(
            IS_MATCH,
            expression = f".*{self.URLREGEX}.*",
            error_message = error_message
        )

IS_NOT_SPAM = HAS_NOT_URL