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Edit File:_format.py

from __future__ import annotations

from contextlib import suppress
from uuid import UUID
import datetime
import ipaddress
import re
import typing

from jsonschema.exceptions import FormatError

_FormatCheckCallable = typing.Callable[[object], bool]
_F = typing.TypeVar("_F", bound=_FormatCheckCallable)
_RaisesType = typing.Union[
    typing.Type[Exception], typing.Tuple[typing.Type[Exception], ...],
]

class FormatChecker(object):
    """
    A ``format`` property checker.

JSON Schema does not mandate that the ``format`` property actually do any
    validation. If validation is desired however, instances of this class can
    be hooked into validators to enable format validation.

`FormatChecker` objects always return ``True`` when asked about
    formats that they do not know how to validate.

To check a custom format using a function that takes an instance and
    returns a ``bool``, use the `FormatChecker.checks` or
    `FormatChecker.cls_checks` decorators.

Arguments:

formats (~collections.abc.Iterable):

The known formats to validate. This argument can be used to
            limit which formats will be used during validation.
    """

checkers: dict[
        str,
        tuple[_FormatCheckCallable, _RaisesType],
    ] = {}

def __init__(self, formats: typing.Iterable[str] | None = None):
        if formats is None:
            self.checkers = self.checkers.copy()
        else:
            self.checkers = dict((k, self.checkers[k]) for k in formats)

def __repr__(self):
        return "<FormatChecker checkers={}>".format(sorted(self.checkers))

def checks(
        self, format: str, raises: _RaisesType = (),
    ) -> typing.Callable[[_F], _F]:
        """
        Register a decorated function as validating a new format.

Arguments:

format (str):

The format that the decorated function will check.

raises (Exception):

The exception(s) raised by the decorated function when an
                invalid instance is found.

The exception object will be accessible as the
                `jsonschema.exceptions.ValidationError.cause` attribute of the
                resulting validation error.
        """

def _checks(func: _F) -> _F:
            self.checkers[format] = (func, raises)
            return func

return _checks

@classmethod
    def cls_checks(
        cls, format: str, raises: _RaisesType = (),
    ) -> typing.Callable[[_F], _F]:
        def _checks(func: _F) -> _F:
            cls.checkers[format] = (func, raises)
            return func

return _checks

def check(self, instance: object, format: str) -> None:
        """
        Check whether the instance conforms to the given format.

Arguments:

instance (*any primitive type*, i.e. str, number, bool):

The instance to check

format (str):

The format that instance should conform to

Raises:

FormatError: if the instance does not conform to ``format``
        """

if format not in self.checkers:
            return

func, raises = self.checkers[format]
        result, cause = None, None
        try:
            result = func(instance)
        except raises as e:
            cause = e
        if not result:
            raise FormatError(f"{instance!r} is not a {format!r}", cause=cause)

def conforms(self, instance: object, format: str) -> bool:
        """
        Check whether the instance conforms to the given format.

Arguments:

instance (*any primitive type*, i.e. str, number, bool):

The instance to check

format (str):

The format that instance should conform to

Returns:

bool: whether it conformed
        """

try:
            self.check(instance, format)
        except FormatError:
            return False
        else:
            return True

draft3_format_checker = FormatChecker()
draft4_format_checker = FormatChecker()
draft6_format_checker = FormatChecker()
draft7_format_checker = FormatChecker()
draft201909_format_checker = FormatChecker()
draft202012_format_checker = FormatChecker()

_draft_checkers: dict[str, FormatChecker] = dict(
    draft3=draft3_format_checker,
    draft4=draft4_format_checker,
    draft6=draft6_format_checker,
    draft7=draft7_format_checker,
    draft201909=draft201909_format_checker,
    draft202012=draft202012_format_checker,
)

def _checks_drafts(
    name=None,
    draft3=None,
    draft4=None,
    draft6=None,
    draft7=None,
    draft201909=None,
    draft202012=None,
    raises=(),
) -> typing.Callable[[_F], _F]:
    draft3 = draft3 or name
    draft4 = draft4 or name
    draft6 = draft6 or name
    draft7 = draft7 or name
    draft201909 = draft201909 or name
    draft202012 = draft202012 or name

def wrap(func: _F) -> _F:
        if draft3:
            func = _draft_checkers["draft3"].checks(draft3, raises)(func)
        if draft4:
            func = _draft_checkers["draft4"].checks(draft4, raises)(func)
        if draft6:
            func = _draft_checkers["draft6"].checks(draft6, raises)(func)
        if draft7:
            func = _draft_checkers["draft7"].checks(draft7, raises)(func)
        if draft201909:
            func = _draft_checkers["draft201909"].checks(draft201909, raises)(
                func,
            )
        if draft202012:
            func = _draft_checkers["draft202012"].checks(draft202012, raises)(
                func,
            )

# Oy. This is bad global state, but relied upon for now, until
        # deprecation. See #519 and test_format_checkers_come_with_defaults
        FormatChecker.cls_checks(
            draft202012 or draft201909 or draft7 or draft6 or draft4 or draft3,
            raises,
        )(func)
        return func

return wrap

@_checks_drafts(name="idn-email")
@_checks_drafts(name="email")
def is_email(instance: object) -> bool:
    if not isinstance(instance, str):
        return True
    return "@" in instance

@_checks_drafts(
    draft3="ip-address",
    draft4="ipv4",
    draft6="ipv4",
    draft7="ipv4",
    draft201909="ipv4",
    draft202012="ipv4",
    raises=ipaddress.AddressValueError,
)
def is_ipv4(instance: object) -> bool:
    if not isinstance(instance, str):
        return True
    return bool(ipaddress.IPv4Address(instance))

@_checks_drafts(name="ipv6", raises=ipaddress.AddressValueError)
def is_ipv6(instance: object) -> bool:
    if not isinstance(instance, str):
        return True
    address = ipaddress.IPv6Address(instance)
    return not getattr(address, "scope_id", "")

with suppress(ImportError):
    from fqdn import FQDN

@_checks_drafts(
        draft3="host-name",
        draft4="hostname",
        draft6="hostname",
        draft7="hostname",
        draft201909="hostname",
        draft202012="hostname",
    )
    def is_host_name(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return FQDN(instance).is_valid

with suppress(ImportError):
    # The built-in `idna` codec only implements RFC 3890, so we go elsewhere.
    import idna

@_checks_drafts(
        draft7="idn-hostname",
        draft201909="idn-hostname",
        draft202012="idn-hostname",
        raises=(idna.IDNAError, UnicodeError),
    )
    def is_idn_host_name(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        idna.encode(instance)
        return True

try:
    import rfc3987
except ImportError:
    with suppress(ImportError):
        from rfc3986_validator import validate_rfc3986

@_checks_drafts(name="uri")
        def is_uri(instance: object) -> bool:
            if not isinstance(instance, str):
                return True
            return validate_rfc3986(instance, rule="URI")

@_checks_drafts(
            draft6="uri-reference",
            draft7="uri-reference",
            draft201909="uri-reference",
            draft202012="uri-reference",
            raises=ValueError,
        )
        def is_uri_reference(instance: object) -> bool:
            if not isinstance(instance, str):
                return True
            return validate_rfc3986(instance, rule="URI_reference")

else:

@_checks_drafts(
        draft7="iri",
        draft201909="iri",
        draft202012="iri",
        raises=ValueError,
    )
    def is_iri(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return rfc3987.parse(instance, rule="IRI")

@_checks_drafts(
        draft7="iri-reference",
        draft201909="iri-reference",
        draft202012="iri-reference",
        raises=ValueError,
    )
    def is_iri_reference(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return rfc3987.parse(instance, rule="IRI_reference")

@_checks_drafts(name="uri", raises=ValueError)
    def is_uri(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return rfc3987.parse(instance, rule="URI")

@_checks_drafts(
        draft6="uri-reference",
        draft7="uri-reference",
        draft201909="uri-reference",
        draft202012="uri-reference",
        raises=ValueError,
    )
    def is_uri_reference(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return rfc3987.parse(instance, rule="URI_reference")

with suppress(ImportError):
    from rfc3339_validator import validate_rfc3339

@_checks_drafts(name="date-time")
    def is_datetime(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return validate_rfc3339(instance.upper())

@_checks_drafts(
        draft7="time",
        draft201909="time",
        draft202012="time",
    )
    def is_time(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return is_datetime("1970-01-01T" + instance)

@_checks_drafts(name="regex", raises=re.error)
def is_regex(instance: object) -> bool:
    if not isinstance(instance, str):
        return True
    return bool(re.compile(instance))

@_checks_drafts(
    draft3="date",
    draft7="date",
    draft201909="date",
    draft202012="date",
    raises=ValueError,
)
def is_date(instance: object) -> bool:
    if not isinstance(instance, str):
        return True
    return bool(instance.isascii() and datetime.date.fromisoformat(instance))

@_checks_drafts(draft3="time", raises=ValueError)
def is_draft3_time(instance: object) -> bool:
    if not isinstance(instance, str):
        return True
    return bool(datetime.datetime.strptime(instance, "%H:%M:%S"))

with suppress(ImportError):
    from webcolors import CSS21_NAMES_TO_HEX
    import webcolors

def is_css_color_code(instance: object) -> bool:
        return webcolors.normalize_hex(instance)

@_checks_drafts(draft3="color", raises=(ValueError, TypeError))
    def is_css21_color(instance: object) -> bool:
        if (
            not isinstance(instance, str)
            or instance.lower() in CSS21_NAMES_TO_HEX
        ):
            return True
        return is_css_color_code(instance)

with suppress(ImportError):
    import jsonpointer

@_checks_drafts(
        draft6="json-pointer",
        draft7="json-pointer",
        draft201909="json-pointer",
        draft202012="json-pointer",
        raises=jsonpointer.JsonPointerException,
    )
    def is_json_pointer(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return bool(jsonpointer.JsonPointer(instance))

# TODO: I don't want to maintain this, so it
    #       needs to go either into jsonpointer (pending
    #       https://github.com/stefankoegl/python-json-pointer/issues/34) or
    #       into a new external library.
    @_checks_drafts(
        draft7="relative-json-pointer",
        draft201909="relative-json-pointer",
        draft202012="relative-json-pointer",
        raises=jsonpointer.JsonPointerException,
    )
    def is_relative_json_pointer(instance: object) -> bool:
        # Definition taken from:
        # https://tools.ietf.org/html/draft-handrews-relative-json-pointer-01#section-3
        if not isinstance(instance, str):
            return True
        non_negative_integer, rest = [], ""
        for i, character in enumerate(instance):
            if character.isdigit():
                # digits with a leading "0" are not allowed
                if i > 0 and int(instance[i - 1]) == 0:
                    return False

non_negative_integer.append(character)
                continue

if not non_negative_integer:
                return False

rest = instance[i:]
            break
        return (rest == "#") or bool(jsonpointer.JsonPointer(rest))

with suppress(ImportError):
    import uri_template

@_checks_drafts(
        draft6="uri-template",
        draft7="uri-template",
        draft201909="uri-template",
        draft202012="uri-template",
    )
    def is_uri_template(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return uri_template.validate(instance)

with suppress(ImportError):
    import isoduration

@_checks_drafts(
        draft201909="duration",
        draft202012="duration",
        raises=isoduration.DurationParsingException,
    )
    def is_duration(instance: object) -> bool:
        if not isinstance(instance, str):
            return True
        return bool(isoduration.parse_duration(instance))

@_checks_drafts(
    draft201909="uuid",
    draft202012="uuid",
    raises=ValueError,
)
def is_uuid(instance: object) -> bool:
    if not isinstance(instance, str):
        return True
    UUID(instance)
    return all(instance[position] == "-" for position in (8, 13, 18, 23))

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