402 lines
11 KiB
Python
402 lines
11 KiB
Python
import datetime
|
|
import re
|
|
import socket
|
|
import struct
|
|
|
|
from jsonschema.compat import str_types
|
|
from jsonschema.exceptions import FormatError
|
|
|
|
|
|
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.Iterable):
|
|
|
|
The known formats to validate. This argument can be used to
|
|
limit which formats will be used during validation.
|
|
"""
|
|
|
|
checkers = {}
|
|
|
|
def __init__(self, formats=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, raises=()):
|
|
"""
|
|
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):
|
|
self.checkers[format] = (func, raises)
|
|
return func
|
|
return _checks
|
|
|
|
cls_checks = classmethod(checks)
|
|
|
|
def check(self, instance, format):
|
|
"""
|
|
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(
|
|
"%r is not a %r" % (instance, format), cause=cause,
|
|
)
|
|
|
|
def conforms(self, instance, format):
|
|
"""
|
|
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()
|
|
|
|
|
|
_draft_checkers = dict(
|
|
draft3=draft3_format_checker,
|
|
draft4=draft4_format_checker,
|
|
draft6=draft6_format_checker,
|
|
draft7=draft7_format_checker,
|
|
)
|
|
|
|
|
|
def _checks_drafts(
|
|
name=None,
|
|
draft3=None,
|
|
draft4=None,
|
|
draft6=None,
|
|
draft7=None,
|
|
raises=(),
|
|
):
|
|
draft3 = draft3 or name
|
|
draft4 = draft4 or name
|
|
draft6 = draft6 or name
|
|
draft7 = draft7 or name
|
|
|
|
def wrap(func):
|
|
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)
|
|
|
|
# Oy. This is bad global state, but relied upon for now, until
|
|
# deprecation. See https://github.com/Julian/jsonschema/issues/519
|
|
# and test_format_checkers_come_with_defaults
|
|
FormatChecker.cls_checks(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):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return "@" in instance
|
|
|
|
|
|
_ipv4_re = re.compile(r"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$")
|
|
|
|
|
|
@_checks_drafts(
|
|
draft3="ip-address", draft4="ipv4", draft6="ipv4", draft7="ipv4",
|
|
)
|
|
def is_ipv4(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
if not _ipv4_re.match(instance):
|
|
return False
|
|
return all(0 <= int(component) <= 255 for component in instance.split("."))
|
|
|
|
|
|
if hasattr(socket, "inet_pton"):
|
|
# FIXME: Really this only should raise struct.error, but see the sadness
|
|
# that is https://twistedmatrix.com/trac/ticket/9409
|
|
@_checks_drafts(
|
|
name="ipv6", raises=(socket.error, struct.error, ValueError),
|
|
)
|
|
def is_ipv6(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return socket.inet_pton(socket.AF_INET6, instance)
|
|
|
|
|
|
_host_name_re = re.compile(r"^[A-Za-z0-9][A-Za-z0-9\.\-]{1,255}$")
|
|
|
|
|
|
@_checks_drafts(
|
|
draft3="host-name",
|
|
draft4="hostname",
|
|
draft6="hostname",
|
|
draft7="hostname",
|
|
)
|
|
def is_host_name(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
if not _host_name_re.match(instance):
|
|
return False
|
|
components = instance.split(".")
|
|
for component in components:
|
|
if len(component) > 63:
|
|
return False
|
|
return True
|
|
|
|
|
|
try:
|
|
# The built-in `idna` codec only implements RFC 3890, so we go elsewhere.
|
|
import idna
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
@_checks_drafts(draft7="idn-hostname", raises=idna.IDNAError)
|
|
def is_idn_host_name(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
idna.encode(instance)
|
|
return True
|
|
|
|
|
|
try:
|
|
import rfc3987
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
@_checks_drafts(draft7="iri", raises=ValueError)
|
|
def is_iri(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return rfc3987.parse(instance, rule="IRI")
|
|
|
|
@_checks_drafts(draft7="iri-reference", raises=ValueError)
|
|
def is_iri_reference(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return rfc3987.parse(instance, rule="IRI_reference")
|
|
|
|
@_checks_drafts(name="uri", raises=ValueError)
|
|
def is_uri(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return rfc3987.parse(instance, rule="URI")
|
|
|
|
@_checks_drafts(
|
|
draft6="uri-reference",
|
|
draft7="uri-reference",
|
|
raises=ValueError,
|
|
)
|
|
def is_uri_reference(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return rfc3987.parse(instance, rule="URI_reference")
|
|
|
|
|
|
try:
|
|
import strict_rfc3339
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
@_checks_drafts(name="date-time")
|
|
def is_datetime(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return strict_rfc3339.validate_rfc3339(instance)
|
|
|
|
@_checks_drafts(draft7="time")
|
|
def is_time(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return is_datetime("1970-01-01T" + instance)
|
|
|
|
|
|
@_checks_drafts(name="regex", raises=re.error)
|
|
def is_regex(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return re.compile(instance)
|
|
|
|
|
|
@_checks_drafts(draft3="date", draft7="date", raises=ValueError)
|
|
def is_date(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return datetime.datetime.strptime(instance, "%Y-%m-%d")
|
|
|
|
|
|
@_checks_drafts(draft3="time", raises=ValueError)
|
|
def is_draft3_time(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return datetime.datetime.strptime(instance, "%H:%M:%S")
|
|
|
|
|
|
try:
|
|
import webcolors
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
def is_css_color_code(instance):
|
|
return webcolors.normalize_hex(instance)
|
|
|
|
@_checks_drafts(draft3="color", raises=(ValueError, TypeError))
|
|
def is_css21_color(instance):
|
|
if (
|
|
not isinstance(instance, str_types) or
|
|
instance.lower() in webcolors.css21_names_to_hex
|
|
):
|
|
return True
|
|
return is_css_color_code(instance)
|
|
|
|
def is_css3_color(instance):
|
|
if instance.lower() in webcolors.css3_names_to_hex:
|
|
return True
|
|
return is_css_color_code(instance)
|
|
|
|
|
|
try:
|
|
import jsonpointer
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
@_checks_drafts(
|
|
draft6="json-pointer",
|
|
draft7="json-pointer",
|
|
raises=jsonpointer.JsonPointerException,
|
|
)
|
|
def is_json_pointer(instance):
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
return 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",
|
|
raises=jsonpointer.JsonPointerException,
|
|
)
|
|
def is_relative_json_pointer(instance):
|
|
# Definition taken from:
|
|
# https://tools.ietf.org/html/draft-handrews-relative-json-pointer-01#section-3
|
|
if not isinstance(instance, str_types):
|
|
return True
|
|
non_negative_integer, rest = [], ""
|
|
for i, character in enumerate(instance):
|
|
if character.isdigit():
|
|
non_negative_integer.append(character)
|
|
continue
|
|
|
|
if not non_negative_integer:
|
|
return False
|
|
|
|
rest = instance[i:]
|
|
break
|
|
return (rest == "#") or jsonpointer.JsonPointer(rest)
|
|
|
|
|
|
try:
|
|
import uritemplate.exceptions
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
@_checks_drafts(
|
|
draft6="uri-template",
|
|
draft7="uri-template",
|
|
raises=uritemplate.exceptions.InvalidTemplate,
|
|
)
|
|
def is_uri_template(
|
|
instance,
|
|
template_validator=uritemplate.Validator().force_balanced_braces(),
|
|
):
|
|
template = uritemplate.URITemplate(instance)
|
|
return template_validator.validate(template)
|