504 lines
17 KiB
Python
504 lines
17 KiB
Python
import ipaddress
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import os
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import re
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from urllib.parse import urlsplit, urlunsplit
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from django.core.exceptions import ValidationError
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from django.utils.deconstruct import deconstructible
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from django.utils.encoding import force_text
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from django.utils.functional import SimpleLazyObject
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from django.utils.ipv6 import is_valid_ipv6_address
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from django.utils.translation import gettext_lazy as _, ngettext_lazy
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# These values, if given to validate(), will trigger the self.required check.
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EMPTY_VALUES = (None, '', [], (), {})
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def _lazy_re_compile(regex, flags=0):
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"""Lazily compile a regex with flags."""
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def _compile():
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# Compile the regex if it was not passed pre-compiled.
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if isinstance(regex, str):
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return re.compile(regex, flags)
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else:
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assert not flags, "flags must be empty if regex is passed pre-compiled"
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return regex
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return SimpleLazyObject(_compile)
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@deconstructible
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class RegexValidator:
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regex = ''
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message = _('Enter a valid value.')
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code = 'invalid'
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inverse_match = False
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flags = 0
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def __init__(self, regex=None, message=None, code=None, inverse_match=None, flags=None):
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if regex is not None:
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self.regex = regex
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if message is not None:
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self.message = message
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if code is not None:
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self.code = code
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if inverse_match is not None:
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self.inverse_match = inverse_match
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if flags is not None:
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self.flags = flags
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if self.flags and not isinstance(self.regex, str):
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raise TypeError("If the flags are set, regex must be a regular expression string.")
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self.regex = _lazy_re_compile(self.regex, self.flags)
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def __call__(self, value):
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"""
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Validate that the input contains a match for the regular expression
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if inverse_match is False, otherwise raise ValidationError.
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"""
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if not (self.inverse_match is not bool(self.regex.search(
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force_text(value)))):
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raise ValidationError(self.message, code=self.code)
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def __eq__(self, other):
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return (
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isinstance(other, RegexValidator) and
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self.regex.pattern == other.regex.pattern and
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self.regex.flags == other.regex.flags and
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(self.message == other.message) and
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(self.code == other.code) and
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(self.inverse_match == other.inverse_match)
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)
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@deconstructible
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class URLValidator(RegexValidator):
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ul = '\u00a1-\uffff' # unicode letters range (must not be a raw string)
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# IP patterns
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ipv4_re = r'(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}'
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ipv6_re = r'\[[0-9a-f:\.]+\]' # (simple regex, validated later)
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# Host patterns
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hostname_re = r'[a-z' + ul + r'0-9](?:[a-z' + ul + r'0-9-]{0,61}[a-z' + ul + r'0-9])?'
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# Max length for domain name labels is 63 characters per RFC 1034 sec. 3.1
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domain_re = r'(?:\.(?!-)[a-z' + ul + r'0-9-]{1,63}(?<!-))*'
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tld_re = (
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r'\.' # dot
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r'(?!-)' # can't start with a dash
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r'(?:[a-z' + ul + '-]{2,63}' # domain label
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r'|xn--[a-z0-9]{1,59})' # or punycode label
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r'(?<!-)' # can't end with a dash
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r'\.?' # may have a trailing dot
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)
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host_re = '(' + hostname_re + domain_re + tld_re + '|localhost)'
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regex = _lazy_re_compile(
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r'^(?:[a-z0-9\.\-\+]*)://' # scheme is validated separately
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r'(?:\S+(?::\S*)?@)?' # user:pass authentication
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r'(?:' + ipv4_re + '|' + ipv6_re + '|' + host_re + ')'
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r'(?::\d{2,5})?' # port
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r'(?:[/?#][^\s]*)?' # resource path
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r'\Z', re.IGNORECASE)
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message = _('Enter a valid URL.')
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schemes = ['http', 'https', 'ftp', 'ftps']
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def __init__(self, schemes=None, **kwargs):
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super().__init__(**kwargs)
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if schemes is not None:
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self.schemes = schemes
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def __call__(self, value):
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# Check first if the scheme is valid
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scheme = value.split('://')[0].lower()
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if scheme not in self.schemes:
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raise ValidationError(self.message, code=self.code)
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# Then check full URL
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try:
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super().__call__(value)
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except ValidationError as e:
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# Trivial case failed. Try for possible IDN domain
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if value:
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try:
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scheme, netloc, path, query, fragment = urlsplit(value)
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except ValueError: # for example, "Invalid IPv6 URL"
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raise ValidationError(self.message, code=self.code)
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try:
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netloc = netloc.encode('idna').decode('ascii') # IDN -> ACE
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except UnicodeError: # invalid domain part
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raise e
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url = urlunsplit((scheme, netloc, path, query, fragment))
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super().__call__(url)
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else:
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raise
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else:
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# Now verify IPv6 in the netloc part
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host_match = re.search(r'^\[(.+)\](?::\d{2,5})?$', urlsplit(value).netloc)
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if host_match:
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potential_ip = host_match.groups()[0]
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try:
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validate_ipv6_address(potential_ip)
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except ValidationError:
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raise ValidationError(self.message, code=self.code)
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# The maximum length of a full host name is 253 characters per RFC 1034
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# section 3.1. It's defined to be 255 bytes or less, but this includes
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# one byte for the length of the name and one byte for the trailing dot
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# that's used to indicate absolute names in DNS.
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if len(urlsplit(value).netloc) > 253:
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raise ValidationError(self.message, code=self.code)
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integer_validator = RegexValidator(
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_lazy_re_compile(r'^-?\d+\Z'),
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message=_('Enter a valid integer.'),
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code='invalid',
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)
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def validate_integer(value):
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return integer_validator(value)
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@deconstructible
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class EmailValidator:
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message = _('Enter a valid email address.')
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code = 'invalid'
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user_regex = _lazy_re_compile(
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r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*\Z" # dot-atom
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r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013\014\016-\177])*"\Z)', # quoted-string
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re.IGNORECASE)
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domain_regex = _lazy_re_compile(
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# max length for domain name labels is 63 characters per RFC 1034
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r'((?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+)(?:[A-Z0-9-]{2,63}(?<!-))\Z',
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re.IGNORECASE)
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literal_regex = _lazy_re_compile(
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# literal form, ipv4 or ipv6 address (SMTP 4.1.3)
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r'\[([A-f0-9:\.]+)\]\Z',
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re.IGNORECASE)
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domain_whitelist = ['localhost']
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def __init__(self, message=None, code=None, whitelist=None):
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if message is not None:
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self.message = message
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if code is not None:
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self.code = code
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if whitelist is not None:
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self.domain_whitelist = whitelist
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def __call__(self, value):
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if not value or '@' not in value:
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raise ValidationError(self.message, code=self.code)
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user_part, domain_part = value.rsplit('@', 1)
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if not self.user_regex.match(user_part):
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raise ValidationError(self.message, code=self.code)
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if (domain_part not in self.domain_whitelist and
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not self.validate_domain_part(domain_part)):
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# Try for possible IDN domain-part
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try:
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domain_part = domain_part.encode('idna').decode('ascii')
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if self.validate_domain_part(domain_part):
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return
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except UnicodeError:
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pass
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raise ValidationError(self.message, code=self.code)
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def validate_domain_part(self, domain_part):
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if self.domain_regex.match(domain_part):
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return True
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literal_match = self.literal_regex.match(domain_part)
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if literal_match:
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ip_address = literal_match.group(1)
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try:
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validate_ipv46_address(ip_address)
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return True
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except ValidationError:
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pass
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return False
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def __eq__(self, other):
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return (
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isinstance(other, EmailValidator) and
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(self.domain_whitelist == other.domain_whitelist) and
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(self.message == other.message) and
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(self.code == other.code)
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)
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validate_email = EmailValidator()
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slug_re = _lazy_re_compile(r'^[-a-zA-Z0-9_]+\Z')
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validate_slug = RegexValidator(
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slug_re,
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# Translators: "letters" means latin letters: a-z and A-Z.
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_("Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens."),
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'invalid'
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)
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slug_unicode_re = _lazy_re_compile(r'^[-\w]+\Z')
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validate_unicode_slug = RegexValidator(
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slug_unicode_re,
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_("Enter a valid 'slug' consisting of Unicode letters, numbers, underscores, or hyphens."),
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'invalid'
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)
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def validate_ipv4_address(value):
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try:
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ipaddress.IPv4Address(value)
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except ValueError:
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raise ValidationError(_('Enter a valid IPv4 address.'), code='invalid')
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def validate_ipv6_address(value):
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if not is_valid_ipv6_address(value):
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raise ValidationError(_('Enter a valid IPv6 address.'), code='invalid')
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def validate_ipv46_address(value):
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try:
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validate_ipv4_address(value)
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except ValidationError:
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try:
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validate_ipv6_address(value)
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except ValidationError:
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raise ValidationError(_('Enter a valid IPv4 or IPv6 address.'), code='invalid')
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ip_address_validator_map = {
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'both': ([validate_ipv46_address], _('Enter a valid IPv4 or IPv6 address.')),
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'ipv4': ([validate_ipv4_address], _('Enter a valid IPv4 address.')),
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'ipv6': ([validate_ipv6_address], _('Enter a valid IPv6 address.')),
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}
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def ip_address_validators(protocol, unpack_ipv4):
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"""
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Depending on the given parameters, return the appropriate validators for
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the GenericIPAddressField.
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"""
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if protocol != 'both' and unpack_ipv4:
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raise ValueError(
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"You can only use `unpack_ipv4` if `protocol` is set to 'both'")
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try:
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return ip_address_validator_map[protocol.lower()]
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except KeyError:
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raise ValueError("The protocol '%s' is unknown. Supported: %s"
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% (protocol, list(ip_address_validator_map)))
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def int_list_validator(sep=',', message=None, code='invalid', allow_negative=False):
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regexp = _lazy_re_compile(r'^%(neg)s\d+(?:%(sep)s%(neg)s\d+)*\Z' % {
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'neg': '(-)?' if allow_negative else '',
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'sep': re.escape(sep),
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})
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return RegexValidator(regexp, message=message, code=code)
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validate_comma_separated_integer_list = int_list_validator(
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message=_('Enter only digits separated by commas.'),
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)
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@deconstructible
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class BaseValidator:
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message = _('Ensure this value is %(limit_value)s (it is %(show_value)s).')
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code = 'limit_value'
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def __init__(self, limit_value, message=None):
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self.limit_value = limit_value
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if message:
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self.message = message
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def __call__(self, value):
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cleaned = self.clean(value)
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params = {'limit_value': self.limit_value, 'show_value': cleaned, 'value': value}
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if self.compare(cleaned, self.limit_value):
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raise ValidationError(self.message, code=self.code, params=params)
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def __eq__(self, other):
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return (
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isinstance(other, self.__class__) and
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self.limit_value == other.limit_value and
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self.message == other.message and
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self.code == other.code
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)
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def compare(self, a, b):
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return a is not b
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def clean(self, x):
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return x
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@deconstructible
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class MaxValueValidator(BaseValidator):
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message = _('Ensure this value is less than or equal to %(limit_value)s.')
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code = 'max_value'
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def compare(self, a, b):
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return a > b
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@deconstructible
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class MinValueValidator(BaseValidator):
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message = _('Ensure this value is greater than or equal to %(limit_value)s.')
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code = 'min_value'
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def compare(self, a, b):
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return a < b
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@deconstructible
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class MinLengthValidator(BaseValidator):
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message = ngettext_lazy(
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'Ensure this value has at least %(limit_value)d character (it has %(show_value)d).',
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'Ensure this value has at least %(limit_value)d characters (it has %(show_value)d).',
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'limit_value')
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code = 'min_length'
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def compare(self, a, b):
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return a < b
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def clean(self, x):
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return len(x)
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@deconstructible
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class MaxLengthValidator(BaseValidator):
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message = ngettext_lazy(
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'Ensure this value has at most %(limit_value)d character (it has %(show_value)d).',
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'Ensure this value has at most %(limit_value)d characters (it has %(show_value)d).',
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'limit_value')
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code = 'max_length'
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def compare(self, a, b):
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return a > b
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def clean(self, x):
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return len(x)
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@deconstructible
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class DecimalValidator:
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"""
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Validate that the input does not exceed the maximum number of digits
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expected, otherwise raise ValidationError.
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"""
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messages = {
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'max_digits': ngettext_lazy(
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'Ensure that there are no more than %(max)s digit in total.',
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'Ensure that there are no more than %(max)s digits in total.',
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'max'
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),
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'max_decimal_places': ngettext_lazy(
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'Ensure that there are no more than %(max)s decimal place.',
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'Ensure that there are no more than %(max)s decimal places.',
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'max'
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),
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'max_whole_digits': ngettext_lazy(
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'Ensure that there are no more than %(max)s digit before the decimal point.',
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'Ensure that there are no more than %(max)s digits before the decimal point.',
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'max'
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),
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}
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def __init__(self, max_digits, decimal_places):
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self.max_digits = max_digits
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self.decimal_places = decimal_places
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def __call__(self, value):
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digit_tuple, exponent = value.as_tuple()[1:]
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decimals = abs(exponent)
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# digit_tuple doesn't include any leading zeros.
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digits = len(digit_tuple)
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if decimals > digits:
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# We have leading zeros up to or past the decimal point. Count
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# everything past the decimal point as a digit. We do not count
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# 0 before the decimal point as a digit since that would mean
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# we would not allow max_digits = decimal_places.
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digits = decimals
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whole_digits = digits - decimals
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if self.max_digits is not None and digits > self.max_digits:
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raise ValidationError(
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self.messages['max_digits'],
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code='max_digits',
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params={'max': self.max_digits},
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)
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if self.decimal_places is not None and decimals > self.decimal_places:
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raise ValidationError(
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self.messages['max_decimal_places'],
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code='max_decimal_places',
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params={'max': self.decimal_places},
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)
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if (self.max_digits is not None and self.decimal_places is not None and
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whole_digits > (self.max_digits - self.decimal_places)):
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raise ValidationError(
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self.messages['max_whole_digits'],
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code='max_whole_digits',
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params={'max': (self.max_digits - self.decimal_places)},
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)
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def __eq__(self, other):
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return (
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isinstance(other, self.__class__) and
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self.max_digits == other.max_digits and
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self.decimal_places == other.decimal_places
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)
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@deconstructible
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class FileExtensionValidator:
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message = _(
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"File extension '%(extension)s' is not allowed. "
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"Allowed extensions are: '%(allowed_extensions)s'."
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)
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code = 'invalid_extension'
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def __init__(self, allowed_extensions=None, message=None, code=None):
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self.allowed_extensions = allowed_extensions
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if message is not None:
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self.message = message
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if code is not None:
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self.code = code
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def __call__(self, value):
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extension = os.path.splitext(value.name)[1][1:].lower()
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if self.allowed_extensions is not None and extension not in self.allowed_extensions:
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raise ValidationError(
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self.message,
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code=self.code,
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params={
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'extension': extension,
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'allowed_extensions': ', '.join(self.allowed_extensions)
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}
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)
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def __eq__(self, other):
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return (
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isinstance(other, self.__class__) and
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self.allowed_extensions == other.allowed_extensions and
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self.message == other.message and
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self.code == other.code
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)
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def get_available_image_extensions():
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try:
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from PIL import Image
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except ImportError:
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return []
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else:
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Image.init()
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return [ext.lower()[1:] for ext in Image.EXTENSION.keys()]
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validate_image_file_extension = FileExtensionValidator(
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allowed_extensions=get_available_image_extensions(),
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|
)
|