583 lines
19 KiB
Python
583 lines
19 KiB
Python
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from __future__ import unicode_literals
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import re
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import uuid
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import warnings
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from wtforms.compat import string_types, text_type
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__all__ = (
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'DataRequired', 'data_required', 'Email', 'email', 'EqualTo', 'equal_to',
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'IPAddress', 'ip_address', 'InputRequired', 'input_required', 'Length',
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'length', 'NumberRange', 'number_range', 'Optional', 'optional',
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'Required', 'required', 'Regexp', 'regexp', 'URL', 'url', 'AnyOf',
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'any_of', 'NoneOf', 'none_of', 'MacAddress', 'mac_address', 'UUID',
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'ValidationError', 'StopValidation'
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)
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class ValidationError(ValueError):
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"""
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Raised when a validator fails to validate its input.
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"""
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def __init__(self, message='', *args, **kwargs):
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ValueError.__init__(self, message, *args, **kwargs)
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class StopValidation(Exception):
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"""
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Causes the validation chain to stop.
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If StopValidation is raised, no more validators in the validation chain are
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called. If raised with a message, the message will be added to the errors
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list.
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"""
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def __init__(self, message='', *args, **kwargs):
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Exception.__init__(self, message, *args, **kwargs)
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class EqualTo(object):
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"""
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Compares the values of two fields.
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:param fieldname:
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The name of the other field to compare to.
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:param message:
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Error message to raise in case of a validation error. Can be
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interpolated with `%(other_label)s` and `%(other_name)s` to provide a
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more helpful error.
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"""
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def __init__(self, fieldname, message=None):
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self.fieldname = fieldname
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self.message = message
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def __call__(self, form, field):
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try:
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other = form[self.fieldname]
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except KeyError:
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raise ValidationError(field.gettext("Invalid field name '%s'.") % self.fieldname)
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if field.data != other.data:
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d = {
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'other_label': hasattr(other, 'label') and other.label.text or self.fieldname,
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'other_name': self.fieldname
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}
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message = self.message
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if message is None:
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message = field.gettext('Field must be equal to %(other_name)s.')
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raise ValidationError(message % d)
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class Length(object):
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"""
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Validates the length of a string.
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:param min:
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The minimum required length of the string. If not provided, minimum
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length will not be checked.
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:param max:
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The maximum length of the string. If not provided, maximum length
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will not be checked.
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:param message:
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Error message to raise in case of a validation error. Can be
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interpolated using `%(min)d` and `%(max)d` if desired. Useful defaults
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are provided depending on the existence of min and max.
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"""
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def __init__(self, min=-1, max=-1, message=None):
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assert min != -1 or max != -1, 'At least one of `min` or `max` must be specified.'
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assert max == -1 or min <= max, '`min` cannot be more than `max`.'
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self.min = min
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self.max = max
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self.message = message
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def __call__(self, form, field):
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l = field.data and len(field.data) or 0
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if l < self.min or self.max != -1 and l > self.max:
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message = self.message
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if message is None:
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if self.max == -1:
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message = field.ngettext('Field must be at least %(min)d character long.',
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'Field must be at least %(min)d characters long.', self.min)
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elif self.min == -1:
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message = field.ngettext('Field cannot be longer than %(max)d character.',
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'Field cannot be longer than %(max)d characters.', self.max)
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else:
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message = field.gettext('Field must be between %(min)d and %(max)d characters long.')
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raise ValidationError(message % dict(min=self.min, max=self.max, length=l))
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class NumberRange(object):
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"""
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Validates that a number is of a minimum and/or maximum value, inclusive.
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This will work with any comparable number type, such as floats and
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decimals, not just integers.
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:param min:
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The minimum required value of the number. If not provided, minimum
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value will not be checked.
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:param max:
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The maximum value of the number. If not provided, maximum value
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will not be checked.
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:param message:
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Error message to raise in case of a validation error. Can be
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interpolated using `%(min)s` and `%(max)s` if desired. Useful defaults
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are provided depending on the existence of min and max.
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"""
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def __init__(self, min=None, max=None, message=None):
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self.min = min
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self.max = max
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self.message = message
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def __call__(self, form, field):
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data = field.data
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if data is None or (self.min is not None and data < self.min) or \
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(self.max is not None and data > self.max):
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message = self.message
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if message is None:
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# we use %(min)s interpolation to support floats, None, and
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# Decimals without throwing a formatting exception.
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if self.max is None:
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message = field.gettext('Number must be at least %(min)s.')
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elif self.min is None:
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message = field.gettext('Number must be at most %(max)s.')
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else:
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message = field.gettext('Number must be between %(min)s and %(max)s.')
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raise ValidationError(message % dict(min=self.min, max=self.max))
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class Optional(object):
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"""
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Allows empty input and stops the validation chain from continuing.
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If input is empty, also removes prior errors (such as processing errors)
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from the field.
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:param strip_whitespace:
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If True (the default) also stop the validation chain on input which
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consists of only whitespace.
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"""
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field_flags = ('optional', )
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def __init__(self, strip_whitespace=True):
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if strip_whitespace:
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self.string_check = lambda s: s.strip()
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else:
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self.string_check = lambda s: s
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def __call__(self, form, field):
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if not field.raw_data or isinstance(field.raw_data[0], string_types) and not self.string_check(field.raw_data[0]):
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field.errors[:] = []
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raise StopValidation()
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class DataRequired(object):
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"""
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Checks the field's data is 'truthy' otherwise stops the validation chain.
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This validator checks that the ``data`` attribute on the field is a 'true'
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value (effectively, it does ``if field.data``.) Furthermore, if the data
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is a string type, a string containing only whitespace characters is
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considered false.
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If the data is empty, also removes prior errors (such as processing errors)
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from the field.
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**NOTE** this validator used to be called `Required` but the way it behaved
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(requiring coerced data, not input data) meant it functioned in a way
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which was not symmetric to the `Optional` validator and furthermore caused
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confusion with certain fields which coerced data to 'falsey' values like
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``0``, ``Decimal(0)``, ``time(0)`` etc. Unless a very specific reason
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exists, we recommend using the :class:`InputRequired` instead.
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:param message:
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Error message to raise in case of a validation error.
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"""
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field_flags = ('required', )
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def __init__(self, message=None):
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self.message = message
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def __call__(self, form, field):
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if not field.data or isinstance(field.data, string_types) and not field.data.strip():
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if self.message is None:
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message = field.gettext('This field is required.')
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else:
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message = self.message
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field.errors[:] = []
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raise StopValidation(message)
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class Required(DataRequired):
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"""
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Legacy alias for DataRequired.
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This is needed over simple aliasing for those who require that the
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class-name of required be 'Required.'
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"""
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def __init__(self, *args, **kwargs):
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super(Required, self).__init__(*args, **kwargs)
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warnings.warn(
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'Required is going away in WTForms 3.0, use DataRequired',
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DeprecationWarning, stacklevel=2
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)
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class InputRequired(object):
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"""
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Validates that input was provided for this field.
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Note there is a distinction between this and DataRequired in that
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InputRequired looks that form-input data was provided, and DataRequired
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looks at the post-coercion data.
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"""
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field_flags = ('required', )
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def __init__(self, message=None):
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self.message = message
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def __call__(self, form, field):
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if not field.raw_data or not field.raw_data[0]:
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if self.message is None:
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message = field.gettext('This field is required.')
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else:
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message = self.message
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field.errors[:] = []
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raise StopValidation(message)
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class Regexp(object):
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"""
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Validates the field against a user provided regexp.
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:param regex:
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The regular expression string to use. Can also be a compiled regular
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expression pattern.
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:param flags:
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The regexp flags to use, for example re.IGNORECASE. Ignored if
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`regex` is not a string.
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:param message:
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Error message to raise in case of a validation error.
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"""
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def __init__(self, regex, flags=0, message=None):
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if isinstance(regex, string_types):
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regex = re.compile(regex, flags)
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self.regex = regex
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self.message = message
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def __call__(self, form, field, message=None):
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match = self.regex.match(field.data or '')
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if not match:
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if message is None:
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if self.message is None:
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message = field.gettext('Invalid input.')
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else:
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message = self.message
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raise ValidationError(message)
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return match
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class Email(object):
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"""
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Validates an email address. Note that this uses a very primitive regular
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expression and should only be used in instances where you later verify by
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other means, such as email activation or lookups.
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:param message:
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Error message to raise in case of a validation error.
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"""
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user_regex = re.compile(
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r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*\Z" # dot-atom
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r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013\014\016-\177])*"\Z)', # quoted-string
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re.IGNORECASE)
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def __init__(self, message=None):
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self.message = message
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self.validate_hostname = HostnameValidation(
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require_tld=True,
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)
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def __call__(self, form, field):
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value = field.data
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message = self.message
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if message is None:
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message = field.gettext('Invalid email address.')
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if not value or '@' not in value:
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raise ValidationError(message)
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user_part, domain_part = value.rsplit('@', 1)
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if not self.user_regex.match(user_part):
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raise ValidationError(message)
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if not self.validate_hostname(domain_part):
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raise ValidationError(message)
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class IPAddress(object):
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"""
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Validates an IP address.
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:param ipv4:
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If True, accept IPv4 addresses as valid (default True)
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:param ipv6:
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If True, accept IPv6 addresses as valid (default False)
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:param message:
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Error message to raise in case of a validation error.
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"""
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def __init__(self, ipv4=True, ipv6=False, message=None):
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if not ipv4 and not ipv6:
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raise ValueError('IP Address Validator must have at least one of ipv4 or ipv6 enabled.')
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self.ipv4 = ipv4
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self.ipv6 = ipv6
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self.message = message
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def __call__(self, form, field):
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value = field.data
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valid = False
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if value:
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valid = (self.ipv4 and self.check_ipv4(value)) or (self.ipv6 and self.check_ipv6(value))
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if not valid:
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message = self.message
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if message is None:
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message = field.gettext('Invalid IP address.')
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raise ValidationError(message)
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@classmethod
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def check_ipv4(cls, value):
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parts = value.split('.')
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if len(parts) == 4 and all(x.isdigit() for x in parts):
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numbers = list(int(x) for x in parts)
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return all(num >= 0 and num < 256 for num in numbers)
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return False
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@classmethod
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def check_ipv6(cls, value):
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parts = value.split(':')
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if len(parts) > 8:
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return False
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num_blank = 0
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for part in parts:
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if not part:
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||
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num_blank += 1
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else:
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||
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try:
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value = int(part, 16)
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except ValueError:
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||
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return False
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||
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else:
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||
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if value < 0 or value >= 65536:
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||
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return False
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||
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if num_blank < 2:
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||
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return True
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|
|
elif num_blank == 2 and not parts[0] and not parts[1]:
|
||
|
|
return True
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
class MacAddress(Regexp):
|
||
|
|
"""
|
||
|
|
Validates a MAC address.
|
||
|
|
|
||
|
|
:param message:
|
||
|
|
Error message to raise in case of a validation error.
|
||
|
|
"""
|
||
|
|
def __init__(self, message=None):
|
||
|
|
pattern = r'^(?:[0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$'
|
||
|
|
super(MacAddress, self).__init__(pattern, message=message)
|
||
|
|
|
||
|
|
def __call__(self, form, field):
|
||
|
|
message = self.message
|
||
|
|
if message is None:
|
||
|
|
message = field.gettext('Invalid Mac address.')
|
||
|
|
|
||
|
|
super(MacAddress, self).__call__(form, field, message)
|
||
|
|
|
||
|
|
|
||
|
|
class URL(Regexp):
|
||
|
|
"""
|
||
|
|
Simple regexp based url validation. Much like the email validator, you
|
||
|
|
probably want to validate the url later by other means if the url must
|
||
|
|
resolve.
|
||
|
|
|
||
|
|
:param require_tld:
|
||
|
|
If true, then the domain-name portion of the URL must contain a .tld
|
||
|
|
suffix. Set this to false if you want to allow domains like
|
||
|
|
`localhost`.
|
||
|
|
:param message:
|
||
|
|
Error message to raise in case of a validation error.
|
||
|
|
"""
|
||
|
|
def __init__(self, require_tld=True, message=None):
|
||
|
|
regex = r'^[a-z]+://(?P<host>[^/:]+)(?P<port>:[0-9]+)?(?P<path>\/.*)?$'
|
||
|
|
super(URL, self).__init__(regex, re.IGNORECASE, message)
|
||
|
|
self.validate_hostname = HostnameValidation(
|
||
|
|
require_tld=require_tld,
|
||
|
|
allow_ip=True,
|
||
|
|
)
|
||
|
|
|
||
|
|
def __call__(self, form, field):
|
||
|
|
message = self.message
|
||
|
|
if message is None:
|
||
|
|
message = field.gettext('Invalid URL.')
|
||
|
|
|
||
|
|
match = super(URL, self).__call__(form, field, message)
|
||
|
|
if not self.validate_hostname(match.group('host')):
|
||
|
|
raise ValidationError(message)
|
||
|
|
|
||
|
|
|
||
|
|
class UUID(object):
|
||
|
|
"""
|
||
|
|
Validates a UUID.
|
||
|
|
|
||
|
|
:param message:
|
||
|
|
Error message to raise in case of a validation error.
|
||
|
|
"""
|
||
|
|
def __init__(self, message=None):
|
||
|
|
self.message = message
|
||
|
|
|
||
|
|
def __call__(self, form, field):
|
||
|
|
message = self.message
|
||
|
|
if message is None:
|
||
|
|
message = field.gettext('Invalid UUID.')
|
||
|
|
try:
|
||
|
|
uuid.UUID(field.data)
|
||
|
|
except ValueError:
|
||
|
|
raise ValidationError(message)
|
||
|
|
|
||
|
|
|
||
|
|
class AnyOf(object):
|
||
|
|
"""
|
||
|
|
Compares the incoming data to a sequence of valid inputs.
|
||
|
|
|
||
|
|
:param values:
|
||
|
|
A sequence of valid inputs.
|
||
|
|
:param message:
|
||
|
|
Error message to raise in case of a validation error. `%(values)s`
|
||
|
|
contains the list of values.
|
||
|
|
:param values_formatter:
|
||
|
|
Function used to format the list of values in the error message.
|
||
|
|
"""
|
||
|
|
def __init__(self, values, message=None, values_formatter=None):
|
||
|
|
self.values = values
|
||
|
|
self.message = message
|
||
|
|
if values_formatter is None:
|
||
|
|
values_formatter = self.default_values_formatter
|
||
|
|
self.values_formatter = values_formatter
|
||
|
|
|
||
|
|
def __call__(self, form, field):
|
||
|
|
if field.data not in self.values:
|
||
|
|
message = self.message
|
||
|
|
if message is None:
|
||
|
|
message = field.gettext('Invalid value, must be one of: %(values)s.')
|
||
|
|
|
||
|
|
raise ValidationError(message % dict(values=self.values_formatter(self.values)))
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def default_values_formatter(values):
|
||
|
|
return ', '.join(text_type(x) for x in values)
|
||
|
|
|
||
|
|
|
||
|
|
class NoneOf(object):
|
||
|
|
"""
|
||
|
|
Compares the incoming data to a sequence of invalid inputs.
|
||
|
|
|
||
|
|
:param values:
|
||
|
|
A sequence of invalid inputs.
|
||
|
|
:param message:
|
||
|
|
Error message to raise in case of a validation error. `%(values)s`
|
||
|
|
contains the list of values.
|
||
|
|
:param values_formatter:
|
||
|
|
Function used to format the list of values in the error message.
|
||
|
|
"""
|
||
|
|
def __init__(self, values, message=None, values_formatter=None):
|
||
|
|
self.values = values
|
||
|
|
self.message = message
|
||
|
|
if values_formatter is None:
|
||
|
|
values_formatter = self.default_values_formatter
|
||
|
|
self.values_formatter = values_formatter
|
||
|
|
|
||
|
|
def __call__(self, form, field):
|
||
|
|
if field.data in self.values:
|
||
|
|
message = self.message
|
||
|
|
if message is None:
|
||
|
|
message = field.gettext('Invalid value, can\'t be any of: %(values)s.')
|
||
|
|
|
||
|
|
raise ValidationError(message % dict(values=self.values_formatter(self.values)))
|
||
|
|
|
||
|
|
@staticmethod
|
||
|
|
def default_values_formatter(v):
|
||
|
|
return ', '.join(text_type(x) for x in v)
|
||
|
|
|
||
|
|
|
||
|
|
class HostnameValidation(object):
|
||
|
|
"""
|
||
|
|
Helper class for checking hostnames for validation.
|
||
|
|
|
||
|
|
This is not a validator in and of itself, and as such is not exported.
|
||
|
|
"""
|
||
|
|
hostname_part = re.compile(r'^(xn-|[a-z0-9]+)(-[a-z0-9]+)*$', re.IGNORECASE)
|
||
|
|
tld_part = re.compile(r'^([a-z]{2,20}|xn--([a-z0-9]+-)*[a-z0-9]+)$', re.IGNORECASE)
|
||
|
|
|
||
|
|
def __init__(self, require_tld=True, allow_ip=False):
|
||
|
|
self.require_tld = require_tld
|
||
|
|
self.allow_ip = allow_ip
|
||
|
|
|
||
|
|
def __call__(self, hostname):
|
||
|
|
if self.allow_ip:
|
||
|
|
if IPAddress.check_ipv4(hostname) or IPAddress.check_ipv6(hostname):
|
||
|
|
return True
|
||
|
|
|
||
|
|
# Encode out IDNA hostnames. This makes further validation easier.
|
||
|
|
try:
|
||
|
|
hostname = hostname.encode('idna')
|
||
|
|
except UnicodeError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
# Turn back into a string in Python 3x
|
||
|
|
if not isinstance(hostname, string_types):
|
||
|
|
hostname = hostname.decode('ascii')
|
||
|
|
|
||
|
|
if len(hostname) > 253:
|
||
|
|
return False
|
||
|
|
|
||
|
|
# Check that all labels in the hostname are valid
|
||
|
|
parts = hostname.split('.')
|
||
|
|
for part in parts:
|
||
|
|
if not part or len(part) > 63:
|
||
|
|
return False
|
||
|
|
if not self.hostname_part.match(part):
|
||
|
|
return False
|
||
|
|
|
||
|
|
if self.require_tld:
|
||
|
|
if len(parts) < 2 or not self.tld_part.match(parts[-1]):
|
||
|
|
return False
|
||
|
|
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
email = Email
|
||
|
|
equal_to = EqualTo
|
||
|
|
ip_address = IPAddress
|
||
|
|
mac_address = MacAddress
|
||
|
|
length = Length
|
||
|
|
number_range = NumberRange
|
||
|
|
optional = Optional
|
||
|
|
required = Required
|
||
|
|
input_required = InputRequired
|
||
|
|
data_required = DataRequired
|
||
|
|
regexp = Regexp
|
||
|
|
url = URL
|
||
|
|
any_of = AnyOf
|
||
|
|
none_of = NoneOf
|