You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
595 lines
16 KiB
595 lines
16 KiB
# SPDX-License-Identifier: MIT
|
|
|
|
"""
|
|
Commonly useful validators.
|
|
"""
|
|
|
|
|
|
import operator
|
|
import re
|
|
|
|
from contextlib import contextmanager
|
|
|
|
from ._config import get_run_validators, set_run_validators
|
|
from ._make import _AndValidator, and_, attrib, attrs
|
|
from .exceptions import NotCallableError
|
|
|
|
|
|
try:
|
|
Pattern = re.Pattern
|
|
except AttributeError: # Python <3.7 lacks a Pattern type.
|
|
Pattern = type(re.compile(""))
|
|
|
|
|
|
__all__ = [
|
|
"and_",
|
|
"deep_iterable",
|
|
"deep_mapping",
|
|
"disabled",
|
|
"ge",
|
|
"get_disabled",
|
|
"gt",
|
|
"in_",
|
|
"instance_of",
|
|
"is_callable",
|
|
"le",
|
|
"lt",
|
|
"matches_re",
|
|
"max_len",
|
|
"min_len",
|
|
"optional",
|
|
"provides",
|
|
"set_disabled",
|
|
]
|
|
|
|
|
|
def set_disabled(disabled):
|
|
"""
|
|
Globally disable or enable running validators.
|
|
|
|
By default, they are run.
|
|
|
|
:param disabled: If ``True``, disable running all validators.
|
|
:type disabled: bool
|
|
|
|
.. warning::
|
|
|
|
This function is not thread-safe!
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
set_run_validators(not disabled)
|
|
|
|
|
|
def get_disabled():
|
|
"""
|
|
Return a bool indicating whether validators are currently disabled or not.
|
|
|
|
:return: ``True`` if validators are currently disabled.
|
|
:rtype: bool
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
return not get_run_validators()
|
|
|
|
|
|
@contextmanager
|
|
def disabled():
|
|
"""
|
|
Context manager that disables running validators within its context.
|
|
|
|
.. warning::
|
|
|
|
This context manager is not thread-safe!
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
set_run_validators(False)
|
|
try:
|
|
yield
|
|
finally:
|
|
set_run_validators(True)
|
|
|
|
|
|
@attrs(repr=False, slots=True, hash=True)
|
|
class _InstanceOfValidator:
|
|
type = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if not isinstance(value, self.type):
|
|
raise TypeError(
|
|
"'{name}' must be {type!r} (got {value!r} that is a "
|
|
"{actual!r}).".format(
|
|
name=attr.name,
|
|
type=self.type,
|
|
actual=value.__class__,
|
|
value=value,
|
|
),
|
|
attr,
|
|
self.type,
|
|
value,
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<instance_of validator for type {type!r}>".format(
|
|
type=self.type
|
|
)
|
|
|
|
|
|
def instance_of(type):
|
|
"""
|
|
A validator that raises a `TypeError` if the initializer is called
|
|
with a wrong type for this particular attribute (checks are performed using
|
|
`isinstance` therefore it's also valid to pass a tuple of types).
|
|
|
|
:param type: The type to check for.
|
|
:type type: type or tuple of types
|
|
|
|
:raises TypeError: With a human readable error message, the attribute
|
|
(of type `attrs.Attribute`), the expected type, and the value it
|
|
got.
|
|
"""
|
|
return _InstanceOfValidator(type)
|
|
|
|
|
|
@attrs(repr=False, frozen=True, slots=True)
|
|
class _MatchesReValidator:
|
|
pattern = attrib()
|
|
match_func = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if not self.match_func(value):
|
|
raise ValueError(
|
|
"'{name}' must match regex {pattern!r}"
|
|
" ({value!r} doesn't)".format(
|
|
name=attr.name, pattern=self.pattern.pattern, value=value
|
|
),
|
|
attr,
|
|
self.pattern,
|
|
value,
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<matches_re validator for pattern {pattern!r}>".format(
|
|
pattern=self.pattern
|
|
)
|
|
|
|
|
|
def matches_re(regex, flags=0, func=None):
|
|
r"""
|
|
A validator that raises `ValueError` if the initializer is called
|
|
with a string that doesn't match *regex*.
|
|
|
|
:param regex: a regex string or precompiled pattern to match against
|
|
:param int flags: flags that will be passed to the underlying re function
|
|
(default 0)
|
|
:param callable func: which underlying `re` function to call. Valid options
|
|
are `re.fullmatch`, `re.search`, and `re.match`; the default ``None``
|
|
means `re.fullmatch`. For performance reasons, the pattern is always
|
|
precompiled using `re.compile`.
|
|
|
|
.. versionadded:: 19.2.0
|
|
.. versionchanged:: 21.3.0 *regex* can be a pre-compiled pattern.
|
|
"""
|
|
valid_funcs = (re.fullmatch, None, re.search, re.match)
|
|
if func not in valid_funcs:
|
|
raise ValueError(
|
|
"'func' must be one of {}.".format(
|
|
", ".join(
|
|
sorted(
|
|
e and e.__name__ or "None" for e in set(valid_funcs)
|
|
)
|
|
)
|
|
)
|
|
)
|
|
|
|
if isinstance(regex, Pattern):
|
|
if flags:
|
|
raise TypeError(
|
|
"'flags' can only be used with a string pattern; "
|
|
"pass flags to re.compile() instead"
|
|
)
|
|
pattern = regex
|
|
else:
|
|
pattern = re.compile(regex, flags)
|
|
|
|
if func is re.match:
|
|
match_func = pattern.match
|
|
elif func is re.search:
|
|
match_func = pattern.search
|
|
else:
|
|
match_func = pattern.fullmatch
|
|
|
|
return _MatchesReValidator(pattern, match_func)
|
|
|
|
|
|
@attrs(repr=False, slots=True, hash=True)
|
|
class _ProvidesValidator:
|
|
interface = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if not self.interface.providedBy(value):
|
|
raise TypeError(
|
|
"'{name}' must provide {interface!r} which {value!r} "
|
|
"doesn't.".format(
|
|
name=attr.name, interface=self.interface, value=value
|
|
),
|
|
attr,
|
|
self.interface,
|
|
value,
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<provides validator for interface {interface!r}>".format(
|
|
interface=self.interface
|
|
)
|
|
|
|
|
|
def provides(interface):
|
|
"""
|
|
A validator that raises a `TypeError` if the initializer is called
|
|
with an object that does not provide the requested *interface* (checks are
|
|
performed using ``interface.providedBy(value)`` (see `zope.interface
|
|
<https://zopeinterface.readthedocs.io/en/latest/>`_).
|
|
|
|
:param interface: The interface to check for.
|
|
:type interface: ``zope.interface.Interface``
|
|
|
|
:raises TypeError: With a human readable error message, the attribute
|
|
(of type `attrs.Attribute`), the expected interface, and the
|
|
value it got.
|
|
"""
|
|
return _ProvidesValidator(interface)
|
|
|
|
|
|
@attrs(repr=False, slots=True, hash=True)
|
|
class _OptionalValidator:
|
|
validator = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
if value is None:
|
|
return
|
|
|
|
self.validator(inst, attr, value)
|
|
|
|
def __repr__(self):
|
|
return "<optional validator for {what} or None>".format(
|
|
what=repr(self.validator)
|
|
)
|
|
|
|
|
|
def optional(validator):
|
|
"""
|
|
A validator that makes an attribute optional. An optional attribute is one
|
|
which can be set to ``None`` in addition to satisfying the requirements of
|
|
the sub-validator.
|
|
|
|
:param validator: A validator (or a list of validators) that is used for
|
|
non-``None`` values.
|
|
:type validator: callable or `list` of callables.
|
|
|
|
.. versionadded:: 15.1.0
|
|
.. versionchanged:: 17.1.0 *validator* can be a list of validators.
|
|
"""
|
|
if isinstance(validator, list):
|
|
return _OptionalValidator(_AndValidator(validator))
|
|
return _OptionalValidator(validator)
|
|
|
|
|
|
@attrs(repr=False, slots=True, hash=True)
|
|
class _InValidator:
|
|
options = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
try:
|
|
in_options = value in self.options
|
|
except TypeError: # e.g. `1 in "abc"`
|
|
in_options = False
|
|
|
|
if not in_options:
|
|
raise ValueError(
|
|
"'{name}' must be in {options!r} (got {value!r})".format(
|
|
name=attr.name, options=self.options, value=value
|
|
),
|
|
attr,
|
|
self.options,
|
|
value,
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<in_ validator with options {options!r}>".format(
|
|
options=self.options
|
|
)
|
|
|
|
|
|
def in_(options):
|
|
"""
|
|
A validator that raises a `ValueError` if the initializer is called
|
|
with a value that does not belong in the options provided. The check is
|
|
performed using ``value in options``.
|
|
|
|
:param options: Allowed options.
|
|
:type options: list, tuple, `enum.Enum`, ...
|
|
|
|
:raises ValueError: With a human readable error message, the attribute (of
|
|
type `attrs.Attribute`), the expected options, and the value it
|
|
got.
|
|
|
|
.. versionadded:: 17.1.0
|
|
.. versionchanged:: 22.1.0
|
|
The ValueError was incomplete until now and only contained the human
|
|
readable error message. Now it contains all the information that has
|
|
been promised since 17.1.0.
|
|
"""
|
|
return _InValidator(options)
|
|
|
|
|
|
@attrs(repr=False, slots=False, hash=True)
|
|
class _IsCallableValidator:
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if not callable(value):
|
|
message = (
|
|
"'{name}' must be callable "
|
|
"(got {value!r} that is a {actual!r})."
|
|
)
|
|
raise NotCallableError(
|
|
msg=message.format(
|
|
name=attr.name, value=value, actual=value.__class__
|
|
),
|
|
value=value,
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<is_callable validator>"
|
|
|
|
|
|
def is_callable():
|
|
"""
|
|
A validator that raises a `attr.exceptions.NotCallableError` if the
|
|
initializer is called with a value for this particular attribute
|
|
that is not callable.
|
|
|
|
.. versionadded:: 19.1.0
|
|
|
|
:raises `attr.exceptions.NotCallableError`: With a human readable error
|
|
message containing the attribute (`attrs.Attribute`) name,
|
|
and the value it got.
|
|
"""
|
|
return _IsCallableValidator()
|
|
|
|
|
|
@attrs(repr=False, slots=True, hash=True)
|
|
class _DeepIterable:
|
|
member_validator = attrib(validator=is_callable())
|
|
iterable_validator = attrib(
|
|
default=None, validator=optional(is_callable())
|
|
)
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if self.iterable_validator is not None:
|
|
self.iterable_validator(inst, attr, value)
|
|
|
|
for member in value:
|
|
self.member_validator(inst, attr, member)
|
|
|
|
def __repr__(self):
|
|
iterable_identifier = (
|
|
""
|
|
if self.iterable_validator is None
|
|
else " {iterable!r}".format(iterable=self.iterable_validator)
|
|
)
|
|
return (
|
|
"<deep_iterable validator for{iterable_identifier}"
|
|
" iterables of {member!r}>"
|
|
).format(
|
|
iterable_identifier=iterable_identifier,
|
|
member=self.member_validator,
|
|
)
|
|
|
|
|
|
def deep_iterable(member_validator, iterable_validator=None):
|
|
"""
|
|
A validator that performs deep validation of an iterable.
|
|
|
|
:param member_validator: Validator(s) to apply to iterable members
|
|
:param iterable_validator: Validator to apply to iterable itself
|
|
(optional)
|
|
|
|
.. versionadded:: 19.1.0
|
|
|
|
:raises TypeError: if any sub-validators fail
|
|
"""
|
|
if isinstance(member_validator, (list, tuple)):
|
|
member_validator = and_(*member_validator)
|
|
return _DeepIterable(member_validator, iterable_validator)
|
|
|
|
|
|
@attrs(repr=False, slots=True, hash=True)
|
|
class _DeepMapping:
|
|
key_validator = attrib(validator=is_callable())
|
|
value_validator = attrib(validator=is_callable())
|
|
mapping_validator = attrib(default=None, validator=optional(is_callable()))
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if self.mapping_validator is not None:
|
|
self.mapping_validator(inst, attr, value)
|
|
|
|
for key in value:
|
|
self.key_validator(inst, attr, key)
|
|
self.value_validator(inst, attr, value[key])
|
|
|
|
def __repr__(self):
|
|
return (
|
|
"<deep_mapping validator for objects mapping {key!r} to {value!r}>"
|
|
).format(key=self.key_validator, value=self.value_validator)
|
|
|
|
|
|
def deep_mapping(key_validator, value_validator, mapping_validator=None):
|
|
"""
|
|
A validator that performs deep validation of a dictionary.
|
|
|
|
:param key_validator: Validator to apply to dictionary keys
|
|
:param value_validator: Validator to apply to dictionary values
|
|
:param mapping_validator: Validator to apply to top-level mapping
|
|
attribute (optional)
|
|
|
|
.. versionadded:: 19.1.0
|
|
|
|
:raises TypeError: if any sub-validators fail
|
|
"""
|
|
return _DeepMapping(key_validator, value_validator, mapping_validator)
|
|
|
|
|
|
@attrs(repr=False, frozen=True, slots=True)
|
|
class _NumberValidator:
|
|
bound = attrib()
|
|
compare_op = attrib()
|
|
compare_func = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if not self.compare_func(value, self.bound):
|
|
raise ValueError(
|
|
"'{name}' must be {op} {bound}: {value}".format(
|
|
name=attr.name,
|
|
op=self.compare_op,
|
|
bound=self.bound,
|
|
value=value,
|
|
)
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<Validator for x {op} {bound}>".format(
|
|
op=self.compare_op, bound=self.bound
|
|
)
|
|
|
|
|
|
def lt(val):
|
|
"""
|
|
A validator that raises `ValueError` if the initializer is called
|
|
with a number larger or equal to *val*.
|
|
|
|
:param val: Exclusive upper bound for values
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
return _NumberValidator(val, "<", operator.lt)
|
|
|
|
|
|
def le(val):
|
|
"""
|
|
A validator that raises `ValueError` if the initializer is called
|
|
with a number greater than *val*.
|
|
|
|
:param val: Inclusive upper bound for values
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
return _NumberValidator(val, "<=", operator.le)
|
|
|
|
|
|
def ge(val):
|
|
"""
|
|
A validator that raises `ValueError` if the initializer is called
|
|
with a number smaller than *val*.
|
|
|
|
:param val: Inclusive lower bound for values
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
return _NumberValidator(val, ">=", operator.ge)
|
|
|
|
|
|
def gt(val):
|
|
"""
|
|
A validator that raises `ValueError` if the initializer is called
|
|
with a number smaller or equal to *val*.
|
|
|
|
:param val: Exclusive lower bound for values
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
return _NumberValidator(val, ">", operator.gt)
|
|
|
|
|
|
@attrs(repr=False, frozen=True, slots=True)
|
|
class _MaxLengthValidator:
|
|
max_length = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if len(value) > self.max_length:
|
|
raise ValueError(
|
|
"Length of '{name}' must be <= {max}: {len}".format(
|
|
name=attr.name, max=self.max_length, len=len(value)
|
|
)
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<max_len validator for {max}>".format(max=self.max_length)
|
|
|
|
|
|
def max_len(length):
|
|
"""
|
|
A validator that raises `ValueError` if the initializer is called
|
|
with a string or iterable that is longer than *length*.
|
|
|
|
:param int length: Maximum length of the string or iterable
|
|
|
|
.. versionadded:: 21.3.0
|
|
"""
|
|
return _MaxLengthValidator(length)
|
|
|
|
|
|
@attrs(repr=False, frozen=True, slots=True)
|
|
class _MinLengthValidator:
|
|
min_length = attrib()
|
|
|
|
def __call__(self, inst, attr, value):
|
|
"""
|
|
We use a callable class to be able to change the ``__repr__``.
|
|
"""
|
|
if len(value) < self.min_length:
|
|
raise ValueError(
|
|
"Length of '{name}' must be => {min}: {len}".format(
|
|
name=attr.name, min=self.min_length, len=len(value)
|
|
)
|
|
)
|
|
|
|
def __repr__(self):
|
|
return "<min_len validator for {min}>".format(min=self.min_length)
|
|
|
|
|
|
def min_len(length):
|
|
"""
|
|
A validator that raises `ValueError` if the initializer is called
|
|
with a string or iterable that is shorter than *length*.
|
|
|
|
:param int length: Minimum length of the string or iterable
|
|
|
|
.. versionadded:: 22.1.0
|
|
"""
|
|
return _MinLengthValidator(length)
|