530 lines
25 KiB
Python
530 lines
25 KiB
Python
"""
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A library of validators that return None and raise ValidationError when the
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provided data isn't valid.
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Validators may be callable classes, and they may have an 'always_test'
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attribute. If an 'always_test' attribute exists (regardless of value), the
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validator will *always* be run, regardless of whether its associated
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form field is required.
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"""
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from django.conf import settings
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from django.utils.translation import gettext, gettext_lazy, ngettext
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from django.utils.functional import Promise, lazy
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import re
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_datere = r'\d{4}-\d{1,2}-\d{1,2}'
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_timere = r'(?:[01]?[0-9]|2[0-3]):[0-5][0-9](?::[0-5][0-9])?'
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alnum_re = re.compile(r'^\w+$')
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alnumurl_re = re.compile(r'^[-\w/]+$')
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ansi_date_re = re.compile('^%s$' % _datere)
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ansi_time_re = re.compile('^%s$' % _timere)
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ansi_datetime_re = re.compile('^%s %s$' % (_datere, _timere))
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email_re = re.compile(
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r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*" # dot-atom
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r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*"' # quoted-string
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r')@(?:[A-Z0-9-]+\.)+[A-Z]{2,6}$', re.IGNORECASE) # domain
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integer_re = re.compile(r'^-?\d+$')
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ip4_re = re.compile(r'^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$')
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phone_re = re.compile(r'^[A-PR-Y0-9]{3}-[A-PR-Y0-9]{3}-[A-PR-Y0-9]{4}$', re.IGNORECASE)
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slug_re = re.compile(r'^[-\w]+$')
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url_re = re.compile(r'^https?://\S+$')
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lazy_inter = lazy(lambda a,b: str(a) % b, str)
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class ValidationError(Exception):
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def __init__(self, message):
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"ValidationError can be passed a string or a list."
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if isinstance(message, list):
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self.messages = message
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else:
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assert isinstance(message, (basestring, Promise)), ("%s should be a string" % repr(message))
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self.messages = [message]
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def __str__(self):
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# This is needed because, without a __str__(), printing an exception
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# instance would result in this:
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# AttributeError: ValidationError instance has no attribute 'args'
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# See http://www.python.org/doc/current/tut/node10.html#handling
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return str(self.messages)
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class CriticalValidationError(Exception):
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def __init__(self, message):
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"ValidationError can be passed a string or a list."
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if isinstance(message, list):
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self.messages = message
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else:
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assert isinstance(message, (basestring, Promise)), ("'%s' should be a string" % message)
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self.messages = [message]
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def __str__(self):
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return str(self.messages)
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def isAlphaNumeric(field_data, all_data):
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if not alnum_re.search(field_data):
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raise ValidationError, gettext("This value must contain only letters, numbers and underscores.")
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def isAlphaNumericURL(field_data, all_data):
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if not alnumurl_re.search(field_data):
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raise ValidationError, gettext("This value must contain only letters, numbers, underscores, dashes or slashes.")
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def isSlug(field_data, all_data):
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if not slug_re.search(field_data):
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raise ValidationError, gettext("This value must contain only letters, numbers, underscores or hyphens.")
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def isLowerCase(field_data, all_data):
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if field_data.lower() != field_data:
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raise ValidationError, gettext("Uppercase letters are not allowed here.")
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def isUpperCase(field_data, all_data):
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if field_data.upper() != field_data:
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raise ValidationError, gettext("Lowercase letters are not allowed here.")
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def isCommaSeparatedIntegerList(field_data, all_data):
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for supposed_int in field_data.split(','):
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try:
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int(supposed_int)
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except ValueError:
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raise ValidationError, gettext("Enter only digits separated by commas.")
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def isCommaSeparatedEmailList(field_data, all_data):
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"""
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Checks that field_data is a string of e-mail addresses separated by commas.
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Blank field_data values will not throw a validation error, and whitespace
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is allowed around the commas.
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"""
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for supposed_email in field_data.split(','):
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try:
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isValidEmail(supposed_email.strip(), '')
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except ValidationError:
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raise ValidationError, gettext("Enter valid e-mail addresses separated by commas.")
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def isValidIPAddress4(field_data, all_data):
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if not ip4_re.search(field_data):
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raise ValidationError, gettext("Please enter a valid IP address.")
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def isNotEmpty(field_data, all_data):
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if field_data.strip() == '':
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raise ValidationError, gettext("Empty values are not allowed here.")
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def isOnlyDigits(field_data, all_data):
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if not field_data.isdigit():
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raise ValidationError, gettext("Non-numeric characters aren't allowed here.")
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def isNotOnlyDigits(field_data, all_data):
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if field_data.isdigit():
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raise ValidationError, gettext("This value can't be comprised solely of digits.")
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def isInteger(field_data, all_data):
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# This differs from isOnlyDigits because this accepts the negative sign
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if not integer_re.search(field_data):
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raise ValidationError, gettext("Enter a whole number.")
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def isOnlyLetters(field_data, all_data):
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if not field_data.isalpha():
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raise ValidationError, gettext("Only alphabetical characters are allowed here.")
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def _isValidDate(date_string):
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"""
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A helper function used by isValidANSIDate and isValidANSIDatetime to
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check if the date is valid. The date string is assumed to already be in
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YYYY-MM-DD format.
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"""
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from datetime import date
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# Could use time.strptime here and catch errors, but datetime.date below
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# produces much friendlier error messages.
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year, month, day = map(int, date_string.split('-'))
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# This check is needed because strftime is used when saving the date
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# value to the database, and strftime requires that the year be >=1900.
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if year < 1900:
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raise ValidationError, gettext('Year must be 1900 or later.')
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try:
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date(year, month, day)
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except ValueError, e:
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raise ValidationError, gettext('Invalid date: %s.' % e)
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def isValidANSIDate(field_data, all_data):
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if not ansi_date_re.search(field_data):
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raise ValidationError, gettext('Enter a valid date in YYYY-MM-DD format.')
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_isValidDate(field_data)
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def isValidANSITime(field_data, all_data):
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if not ansi_time_re.search(field_data):
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raise ValidationError, gettext('Enter a valid time in HH:MM format.')
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def isValidANSIDatetime(field_data, all_data):
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if not ansi_datetime_re.search(field_data):
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raise ValidationError, gettext('Enter a valid date/time in YYYY-MM-DD HH:MM format.')
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_isValidDate(field_data.split()[0])
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def isValidEmail(field_data, all_data):
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if not email_re.search(field_data):
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raise ValidationError, gettext('Enter a valid e-mail address.')
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def isValidImage(field_data, all_data):
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"""
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Checks that the file-upload field data contains a valid image (GIF, JPG,
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PNG, possibly others -- whatever the Python Imaging Library supports).
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"""
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from PIL import Image
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from cStringIO import StringIO
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try:
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content = field_data['content']
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except TypeError:
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raise ValidationError, gettext("No file was submitted. Check the encoding type on the form.")
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try:
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Image.open(StringIO(content))
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except IOError: # Python Imaging Library doesn't recognize it as an image
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raise ValidationError, gettext("Upload a valid image. The file you uploaded was either not an image or a corrupted image.")
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def isValidImageURL(field_data, all_data):
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uc = URLMimeTypeCheck(('image/jpeg', 'image/gif', 'image/png'))
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try:
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uc(field_data, all_data)
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except URLMimeTypeCheck.InvalidContentType:
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raise ValidationError, gettext("The URL %s does not point to a valid image.") % field_data
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def isValidPhone(field_data, all_data):
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if not phone_re.search(field_data):
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raise ValidationError, gettext('Phone numbers must be in XXX-XXX-XXXX format. "%s" is invalid.') % field_data
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def isValidQuicktimeVideoURL(field_data, all_data):
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"Checks that the given URL is a video that can be played by QuickTime (qt, mpeg)"
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uc = URLMimeTypeCheck(('video/quicktime', 'video/mpeg',))
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try:
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uc(field_data, all_data)
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except URLMimeTypeCheck.InvalidContentType:
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raise ValidationError, gettext("The URL %s does not point to a valid QuickTime video.") % field_data
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def isValidURL(field_data, all_data):
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if not url_re.search(field_data):
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raise ValidationError, gettext("A valid URL is required.")
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def isValidHTML(field_data, all_data):
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import urllib, urllib2
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try:
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u = urllib2.urlopen('http://validator.w3.org/check', urllib.urlencode({'fragment': field_data, 'output': 'xml'}))
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except:
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# Validator or Internet connection is unavailable. Fail silently.
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return
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html_is_valid = (u.headers.get('x-w3c-validator-status', 'Invalid') == 'Valid')
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if html_is_valid:
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return
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from xml.dom.minidom import parseString
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error_messages = [e.firstChild.wholeText for e in parseString(u.read()).getElementsByTagName('messages')[0].getElementsByTagName('msg')]
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raise ValidationError, gettext("Valid HTML is required. Specific errors are:\n%s") % "\n".join(error_messages)
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def isWellFormedXml(field_data, all_data):
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from xml.dom.minidom import parseString
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try:
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parseString(field_data)
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except Exception, e: # Naked except because we're not sure what will be thrown
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raise ValidationError, gettext("Badly formed XML: %s") % str(e)
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def isWellFormedXmlFragment(field_data, all_data):
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isWellFormedXml('<root>%s</root>' % field_data, all_data)
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def isExistingURL(field_data, all_data):
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import urllib2
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try:
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u = urllib2.urlopen(field_data)
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except ValueError:
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raise ValidationError, gettext("Invalid URL: %s") % field_data
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except urllib2.HTTPError, e:
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# 401s are valid; they just mean authorization is required.
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if e.code not in ('401',):
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raise ValidationError, gettext("The URL %s is a broken link.") % field_data
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except: # urllib2.URLError, httplib.InvalidURL, etc.
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raise ValidationError, gettext("The URL %s is a broken link.") % field_data
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def isValidUSState(field_data, all_data):
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"Checks that the given string is a valid two-letter U.S. state abbreviation"
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states = ['AA', 'AE', 'AK', 'AL', 'AP', 'AR', 'AS', 'AZ', 'CA', 'CO', 'CT', 'DC', 'DE', 'FL', 'FM', 'GA', 'GU', 'HI', 'IA', 'ID', 'IL', 'IN', 'KS', 'KY', 'LA', 'MA', 'MD', 'ME', 'MH', 'MI', 'MN', 'MO', 'MP', 'MS', 'MT', 'NC', 'ND', 'NE', 'NH', 'NJ', 'NM', 'NV', 'NY', 'OH', 'OK', 'OR', 'PA', 'PR', 'PW', 'RI', 'SC', 'SD', 'TN', 'TX', 'UT', 'VA', 'VI', 'VT', 'WA', 'WI', 'WV', 'WY']
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if field_data.upper() not in states:
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raise ValidationError, gettext("Enter a valid U.S. state abbreviation.")
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def hasNoProfanities(field_data, all_data):
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"""
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Checks that the given string has no profanities in it. This does a simple
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check for whether each profanity exists within the string, so 'fuck' will
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catch 'motherfucker' as well. Raises a ValidationError such as:
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Watch your mouth! The words "f--k" and "s--t" are not allowed here.
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"""
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field_data = field_data.lower() # normalize
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words_seen = [w for w in settings.PROFANITIES_LIST if w in field_data]
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if words_seen:
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from django.utils.text import get_text_list
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plural = len(words_seen) > 1
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raise ValidationError, ngettext("Watch your mouth! The word %s is not allowed here.",
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"Watch your mouth! The words %s are not allowed here.", plural) % \
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get_text_list(['"%s%s%s"' % (i[0], '-'*(len(i)-2), i[-1]) for i in words_seen], 'and')
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class AlwaysMatchesOtherField(object):
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def __init__(self, other_field_name, error_message=None):
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self.other = other_field_name
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self.error_message = error_message or lazy_inter(gettext_lazy("This field must match the '%s' field."), self.other)
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self.always_test = True
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def __call__(self, field_data, all_data):
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if field_data != all_data[self.other]:
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raise ValidationError, self.error_message
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class ValidateIfOtherFieldEquals(object):
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def __init__(self, other_field, other_value, validator_list):
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self.other_field, self.other_value = other_field, other_value
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self.validator_list = validator_list
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self.always_test = True
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def __call__(self, field_data, all_data):
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if all_data.has_key(self.other_field) and all_data[self.other_field] == self.other_value:
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for v in self.validator_list:
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v(field_data, all_data)
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class RequiredIfOtherFieldNotGiven(object):
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def __init__(self, other_field_name, error_message=gettext_lazy("Please enter something for at least one field.")):
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self.other, self.error_message = other_field_name, error_message
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self.always_test = True
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def __call__(self, field_data, all_data):
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if not all_data.get(self.other, False) and not field_data:
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raise ValidationError, self.error_message
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class RequiredIfOtherFieldsGiven(object):
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def __init__(self, other_field_names, error_message=gettext_lazy("Please enter both fields or leave them both empty.")):
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self.other, self.error_message = other_field_names, error_message
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self.always_test = True
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def __call__(self, field_data, all_data):
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for field in self.other:
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if all_data.get(field, False) and not field_data:
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raise ValidationError, self.error_message
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class RequiredIfOtherFieldGiven(RequiredIfOtherFieldsGiven):
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"Like RequiredIfOtherFieldsGiven, but takes a single field name instead of a list."
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def __init__(self, other_field_name, error_message=gettext_lazy("Please enter both fields or leave them both empty.")):
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RequiredIfOtherFieldsGiven.__init__(self, [other_field_name], error_message)
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class RequiredIfOtherFieldEquals(object):
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def __init__(self, other_field, other_value, error_message=None):
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self.other_field = other_field
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self.other_value = other_value
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self.error_message = error_message or lazy_inter(gettext_lazy("This field must be given if %(field)s is %(value)s"), {
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'field': other_field, 'value': other_value})
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self.always_test = True
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def __call__(self, field_data, all_data):
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if all_data.has_key(self.other_field) and all_data[self.other_field] == self.other_value and not field_data:
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raise ValidationError(self.error_message)
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class RequiredIfOtherFieldDoesNotEqual(object):
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def __init__(self, other_field, other_value, error_message=None):
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self.other_field = other_field
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self.other_value = other_value
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self.error_message = error_message or lazy_inter(gettext_lazy("This field must be given if %(field)s is not %(value)s"), {
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'field': other_field, 'value': other_value})
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self.always_test = True
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def __call__(self, field_data, all_data):
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if all_data.has_key(self.other_field) and all_data[self.other_field] != self.other_value and not field_data:
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raise ValidationError(self.error_message)
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class IsLessThanOtherField(object):
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def __init__(self, other_field_name, error_message):
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self.other, self.error_message = other_field_name, error_message
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def __call__(self, field_data, all_data):
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if field_data > all_data[self.other]:
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raise ValidationError, self.error_message
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class UniqueAmongstFieldsWithPrefix(object):
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def __init__(self, field_name, prefix, error_message):
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self.field_name, self.prefix = field_name, prefix
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self.error_message = error_message or gettext_lazy("Duplicate values are not allowed.")
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def __call__(self, field_data, all_data):
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for field_name, value in all_data.items():
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if field_name != self.field_name and value == field_data:
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raise ValidationError, self.error_message
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class IsAPowerOf(object):
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"""
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>>> v = IsAPowerOf(2)
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>>> v(4, None)
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>>> v(8, None)
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>>> v(16, None)
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>>> v(17, None)
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django.core.validators.ValidationError: ['This value must be a power of 2.']
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"""
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def __init__(self, power_of):
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self.power_of = power_of
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def __call__(self, field_data, all_data):
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from math import log
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val = log(int(field_data)) / log(self.power_of)
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if val != int(val):
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raise ValidationError, gettext("This value must be a power of %s.") % self.power_of
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class IsValidFloat(object):
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def __init__(self, max_digits, decimal_places):
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self.max_digits, self.decimal_places = max_digits, decimal_places
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def __call__(self, field_data, all_data):
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data = str(field_data)
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try:
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float(data)
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except ValueError:
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raise ValidationError, gettext("Please enter a valid decimal number.")
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# Negative floats require more space to input.
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max_allowed_length = data.startswith('-') and (self.max_digits + 2) or (self.max_digits + 1)
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if len(data) > max_allowed_length:
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raise ValidationError, ngettext("Please enter a valid decimal number with at most %s total digit.",
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"Please enter a valid decimal number with at most %s total digits.", self.max_digits) % self.max_digits
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if (not '.' in data and len(data) > (max_allowed_length - self.decimal_places - 1)) or ('.' in data and len(data) > (max_allowed_length - (self.decimal_places - len(data.split('.')[1])))):
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raise ValidationError, ngettext( "Please enter a valid decimal number with a whole part of at most %s digit.",
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"Please enter a valid decimal number with a whole part of at most %s digits.", str(self.max_digits-self.decimal_places)) % str(self.max_digits-self.decimal_places)
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if '.' in data and len(data.split('.')[1]) > self.decimal_places:
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raise ValidationError, ngettext("Please enter a valid decimal number with at most %s decimal place.",
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"Please enter a valid decimal number with at most %s decimal places.", self.decimal_places) % self.decimal_places
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class HasAllowableSize(object):
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"""
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Checks that the file-upload field data is a certain size. min_size and
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max_size are measurements in bytes.
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"""
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def __init__(self, min_size=None, max_size=None, min_error_message=None, max_error_message=None):
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self.min_size, self.max_size = min_size, max_size
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self.min_error_message = min_error_message or lazy_inter(gettext_lazy("Make sure your uploaded file is at least %s bytes big."), min_size)
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|
self.max_error_message = max_error_message or lazy_inter(gettext_lazy("Make sure your uploaded file is at most %s bytes big."), max_size)
|
|
|
|
def __call__(self, field_data, all_data):
|
|
try:
|
|
content = field_data['content']
|
|
except TypeError:
|
|
raise ValidationError, gettext_lazy("No file was submitted. Check the encoding type on the form.")
|
|
if self.min_size is not None and len(content) < self.min_size:
|
|
raise ValidationError, self.min_error_message
|
|
if self.max_size is not None and len(content) > self.max_size:
|
|
raise ValidationError, self.max_error_message
|
|
|
|
class MatchesRegularExpression(object):
|
|
"""
|
|
Checks that the field matches the given regular-expression. The regex
|
|
should be in string format, not already compiled.
|
|
"""
|
|
def __init__(self, regexp, error_message=gettext_lazy("The format for this field is wrong.")):
|
|
self.regexp = re.compile(regexp)
|
|
self.error_message = error_message
|
|
|
|
def __call__(self, field_data, all_data):
|
|
if not self.regexp.search(field_data):
|
|
raise ValidationError(self.error_message)
|
|
|
|
class AnyValidator(object):
|
|
"""
|
|
This validator tries all given validators. If any one of them succeeds,
|
|
validation passes. If none of them succeeds, the given message is thrown
|
|
as a validation error. The message is rather unspecific, so it's best to
|
|
specify one on instantiation.
|
|
"""
|
|
def __init__(self, validator_list=None, error_message=gettext_lazy("This field is invalid.")):
|
|
if validator_list is None: validator_list = []
|
|
self.validator_list = validator_list
|
|
self.error_message = error_message
|
|
for v in validator_list:
|
|
if hasattr(v, 'always_test'):
|
|
self.always_test = True
|
|
|
|
def __call__(self, field_data, all_data):
|
|
for v in self.validator_list:
|
|
try:
|
|
v(field_data, all_data)
|
|
return
|
|
except ValidationError, e:
|
|
pass
|
|
raise ValidationError(self.error_message)
|
|
|
|
class URLMimeTypeCheck(object):
|
|
"Checks that the provided URL points to a document with a listed mime type"
|
|
class CouldNotRetrieve(ValidationError):
|
|
pass
|
|
class InvalidContentType(ValidationError):
|
|
pass
|
|
|
|
def __init__(self, mime_type_list):
|
|
self.mime_type_list = mime_type_list
|
|
|
|
def __call__(self, field_data, all_data):
|
|
import urllib2
|
|
try:
|
|
isValidURL(field_data, all_data)
|
|
except ValidationError:
|
|
raise
|
|
try:
|
|
info = urllib2.urlopen(field_data).info()
|
|
except (urllib2.HTTPError, urllib2.URLError):
|
|
raise URLMimeTypeCheck.CouldNotRetrieve, gettext("Could not retrieve anything from %s.") % field_data
|
|
content_type = info['content-type']
|
|
if content_type not in self.mime_type_list:
|
|
raise URLMimeTypeCheck.InvalidContentType, gettext("The URL %(url)s returned the invalid Content-Type header '%(contenttype)s'.") % {
|
|
'url': field_data, 'contenttype': content_type}
|
|
|
|
class RelaxNGCompact(object):
|
|
"Validate against a Relax NG compact schema"
|
|
def __init__(self, schema_path, additional_root_element=None):
|
|
self.schema_path = schema_path
|
|
self.additional_root_element = additional_root_element
|
|
|
|
def __call__(self, field_data, all_data):
|
|
import os, tempfile
|
|
if self.additional_root_element:
|
|
field_data = '<%(are)s>%(data)s\n</%(are)s>' % {
|
|
'are': self.additional_root_element,
|
|
'data': field_data
|
|
}
|
|
filename = tempfile.mktemp() # Insecure, but nothing else worked
|
|
fp = open(filename, 'w')
|
|
fp.write(field_data)
|
|
fp.close()
|
|
if not os.path.exists(settings.JING_PATH):
|
|
raise Exception, "%s not found!" % settings.JING_PATH
|
|
p = os.popen('%s -c %s %s' % (settings.JING_PATH, self.schema_path, filename))
|
|
errors = [line.strip() for line in p.readlines()]
|
|
p.close()
|
|
os.unlink(filename)
|
|
display_errors = []
|
|
lines = field_data.split('\n')
|
|
for error in errors:
|
|
ignored, line, level, message = error.split(':', 3)
|
|
# Scrape the Jing error messages to reword them more nicely.
|
|
m = re.search(r'Expected "(.*?)" to terminate element starting on line (\d+)', message)
|
|
if m:
|
|
display_errors.append(_('Please close the unclosed %(tag)s tag from line %(line)s. (Line starts with "%(start)s".)') % \
|
|
{'tag':m.group(1).replace('/', ''), 'line':m.group(2), 'start':lines[int(m.group(2)) - 1][:30]})
|
|
continue
|
|
if message.strip() == 'text not allowed here':
|
|
display_errors.append(_('Some text starting on line %(line)s is not allowed in that context. (Line starts with "%(start)s".)') % \
|
|
{'line':line, 'start':lines[int(line) - 1][:30]})
|
|
continue
|
|
m = re.search(r'\s*attribute "(.*?)" not allowed at this point; ignored', message)
|
|
if m:
|
|
display_errors.append(_('"%(attr)s" on line %(line)s is an invalid attribute. (Line starts with "%(start)s".)') % \
|
|
{'attr':m.group(1), 'line':line, 'start':lines[int(line) - 1][:30]})
|
|
continue
|
|
m = re.search(r'\s*unknown element "(.*?)"', message)
|
|
if m:
|
|
display_errors.append(_('"<%(tag)s>" on line %(line)s is an invalid tag. (Line starts with "%(start)s".)') % \
|
|
{'tag':m.group(1), 'line':line, 'start':lines[int(line) - 1][:30]})
|
|
continue
|
|
if message.strip() == 'required attributes missing':
|
|
display_errors.append(_('A tag on line %(line)s is missing one or more required attributes. (Line starts with "%(start)s".)') % \
|
|
{'line':line, 'start':lines[int(line) - 1][:30]})
|
|
continue
|
|
m = re.search(r'\s*bad value for attribute "(.*?)"', message)
|
|
if m:
|
|
display_errors.append(_('The "%(attr)s" attribute on line %(line)s has an invalid value. (Line starts with "%(start)s".)') % \
|
|
{'attr':m.group(1), 'line':line, 'start':lines[int(line) - 1][:30]})
|
|
continue
|
|
# Failing all those checks, use the default error message.
|
|
display_error = 'Line %s: %s [%s]' % (line, message, level.strip())
|
|
display_errors.append(display_error)
|
|
if len(display_errors) > 0:
|
|
raise ValidationError, display_errors
|