Source code for jsonschema._format

import datetime
import re
import socket
import struct

from jsonschema.compat import str_types
from jsonschema.exceptions import FormatError


[docs]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)
[docs] 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)
[docs] 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, )
[docs] 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)