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import datetime
import re
import socket
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.
:class:`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 :meth:`FormatChecker.checks` or
:meth:`FormatChecker.cls_checks` decorators.
:argument iterable formats: 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 checks(self, format, raises=()):
"""
Register a decorated function as validating a new format.
:argument str format: the format that the decorated function will check
:argument Exception raises: the exception(s) raised by the decorated
function when an invalid instance is found. The exception object
will be accessible as the :attr:`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.
:argument instance: the instance to check
:type: any primitive type (str, number, bool)
:argument str format: the format that instance should conform to
:raises: :exc:`FormatError` if instance does not conform to format
"""
if format in self.checkers:
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.
:argument instance: the instance to check
:type: any primitive type (str, number, bool)
:argument str format: the format that instance should conform to
:rtype: bool
"""
try:
self.check(instance, format)
except FormatError:
return False
else:
return True
_draft_checkers = {"draft3": [], "draft4": []}
def _checks_drafts(both=None, draft3=None, draft4=None, raises=()):
draft3 = draft3 or both
draft4 = draft4 or both
def wrap(func):
if draft3:
_draft_checkers["draft3"].append(draft3)
func = FormatChecker.cls_checks(draft3, raises)(func)
if draft4:
_draft_checkers["draft4"].append(draft4)
func = FormatChecker.cls_checks(draft4, raises)(func)
return func
return wrap
@_checks_drafts("email")
def is_email(instance):
return "@" in instance
_checks_drafts(draft3="ip-address", draft4="ipv4", raises=socket.error)(
socket.inet_aton
)
if hasattr(socket, "inet_pton"):
@_checks_drafts("ipv6", raises=socket.error)
def is_ipv6(instance):
return socket.inet_pton(socket.AF_INET6, instance)
@_checks_drafts(draft3="host-name", draft4="hostname")
def is_host_name(instance):
pattern = "^[A-Za-z0-9][A-Za-z0-9\.\-]{1,255}$"
if not re.match(pattern, instance):
return False
components = instance.split(".")
for component in components:
if len(component) > 63:
return False
return True
try:
import rfc3987
except ImportError:
pass
else:
@_checks_drafts("uri", raises=ValueError)
def is_uri(instance):
return rfc3987.parse(instance, rule="URI_reference")
try:
import isodate
except ImportError:
pass
else:
_err = (ValueError, isodate.ISO8601Error)
_checks_drafts("date-time", raises=_err)(isodate.parse_datetime)
_checks_drafts("regex", raises=re.error)(re.compile)
@_checks_drafts(draft3="date", raises=ValueError)
def is_date(instance):
return datetime.datetime.strptime(instance, "%Y-%m-%d")
@_checks_drafts(draft3="time", raises=ValueError)
def is_time(instance):
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 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)
draft3_format_checker = FormatChecker(_draft_checkers["draft3"])
draft4_format_checker = FormatChecker(_draft_checkers["draft4"])
|
