Validator.py 33.8 KB
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# -*- coding: utf-8 -*-
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from __future__ import absolute_import
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import re
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import six
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from . import PatternChecker
from .DummyField import fields
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from DateTime import DateTime
from threading import Thread
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from six.moves.urllib.request import urlopen
from six.moves.urllib.parse import urljoin
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from .Errors import ValidationError
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from DateTime.DateTime import DateError, TimeError
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import unicodedata
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class ValidatorBase:
    """Even more minimalistic base class for validators.
    """
    property_names = ['enabled','editable']

    message_names = []

    enabled = fields.CheckBoxField('enabled',
                                   title="Enabled",
                                   description=(
        "If a field is not enabled, it will considered to be not "
        "in the form during rendering or validation. Be careful "
        "when you change this state dynamically (in the TALES tab): "
        "a user could submit a field that since got disabled, or "
        "get a validation error as a field suddenly got enabled that "
        "wasn't there when the form was drawn."),
                                   default=1)

    editable = fields.CheckBoxField('editable',
                                   title="Editable",
                                   description=(
        "If a field is not editable, then the user can only see"
        "the value. This allows to drawn very different forms depending"
        "on use permissions."),
                                   default=1)

    def raise_error(self, error_key, field):
        raise ValidationError(error_key, field)

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    def validate(self, field, key, REQUEST):
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        pass # override in subclass

    def need_validate(self, field, key, REQUEST):
        """Default behavior is always validation.
        """
        return 1
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class Validator(ValidatorBase):
    """Validates input and possibly transforms it to output.
    """
    property_names = ValidatorBase.property_names + ['external_validator']

    external_validator = fields.MethodField('external_validator',
                                            title="External Validator",
                                            description=(
        "When a method name is supplied, this method will be "
        "called each time this field is being validated. All other "
        "validation code is called first, however. The value (result of "
        "previous validation) and the REQUEST object will be passed as "
        "arguments to this method. Your method should return true if the "
        "validation succeeded. Anything else will cause "
        "'external_validator_failed' to be raised."),
                                            default="",
                                            required=0)
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    message_names = ValidatorBase.message_names + ['external_validator_failed']

    external_validator_failed = "The input failed the external validator."

class StringBaseValidator(Validator):
    """Simple string validator.
    """
    property_names = Validator.property_names + ['required', 'whitespace_preserve']

    required = fields.CheckBoxField('required',
                                title='Required',
                                description=(
    "Checked if the field is required; the user has to fill in some "
    "data."),
                                default=0)

    whitespace_preserve = fields.CheckBoxField('whitespace_preserve',
                                               title="Preserve whitespace",
                                               description=(
        "Checked if the field preserves whitespace. This means even "
        "just whitespace input is considered to be data."),
                                               default=0)

    message_names = Validator.message_names + ['required_not_found']

    required_not_found = 'Input is required but no input given.'

    def validate(self, field, key, REQUEST):
      # We had to add this patch for hidden fields of type "list"
      value = REQUEST.get(key, REQUEST.get('default_%s' % (key, )))
      if value is None:
        if field.get_value('required'):
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          raise Exception('Required field %r has not been transmitted. Check that all required fields are in visible groups.' % field.id)
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        else:
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          raise KeyError('Field %r is not present in request object.' % field.id)
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      if isinstance(value, str):
        if field.has_value('whitespace_preserve'):
          if not field.get_value('whitespace_preserve'):
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            value = value.strip()
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        else:
          # XXX Compatibility: use to prevent KeyError exception from get_value
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          value = value.strip()
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      if field.get_value('required') and value == "":
        self.raise_error('required_not_found', field)

      return value

class StringValidator(StringBaseValidator):
    property_names = StringBaseValidator.property_names +\
                     ['unicode', 'max_length', 'truncate']

    unicode = fields.CheckBoxField('unicode',
                                   title='Unicode',
                                   description=(
        "Checked if the field delivers a unicode string instead of an "
        "8-bit string."),
                                   default=0)

    max_length = fields.IntegerField('max_length',
                                     title='Maximum length',
                                     description=(
        "The maximum amount of characters that can be entered in this "
        "field. If set to 0 or is left empty, there is no maximum. "
        "Note that this is server side validation."),
                                     default="",
                                     required=0)
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    truncate = fields.CheckBoxField('truncate',
                                    title='Truncate',
                                    description=(
        "If checked, truncate the field if it receives more input than is "
        "allowed. The normal behavior in this case is to raise a validation "
        "error, but the text can be silently truncated instead."),
                                    default=0)

    message_names = StringBaseValidator.message_names +\
                    ['too_long']

    too_long = 'Too much input was given.'

    def validate(self, field, key, REQUEST):
        value = StringBaseValidator.validate(self, field, key, REQUEST)
        if field.get_value('unicode'):
            # use acquisition to get encoding of form
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            value = six.text_type(value, field.get_form_encoding())
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        max_length = field.get_value('max_length') or 0
        truncate = field.get_value('truncate')
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        if max_length > 0 and len(value) > max_length:
            if truncate:
                value = value[:max_length]
            else:
                self.raise_error('too_long', field)
        return value

StringValidatorInstance = StringValidator()

class EmailValidator(StringValidator):
    message_names = StringValidator.message_names + ['not_email']

    not_email = 'You did not enter an email address.'

    # This regex allows for a simple username or a username in a
    # multi-dropbox (%). The host part has to be a normal fully
    # qualified domain name, allowing for 6 characters (.museum) as a
    # TLD.  No bang paths (uucp), no dotted-ip-addresses, no angle
    # brackets around the address (we assume these would be added by
    # some custom script if needed), and of course no characters that
    # don't belong in an e-mail address.
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    pattern = re.compile('^[0-9a-zA-Z_\'&.%+-]+@([0-9a-zA-Z]([0-9a-zA-Z-]*[0-9a-zA-Z])?\.)+[a-zA-Z]{2,}$')
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    def validate(self, field, key, REQUEST):
        value = StringValidator.validate(self, field, key, REQUEST)
        if value == "" and not field.get_value('required'):
            return value

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        if self.pattern.search(value.lower()) == None:
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            self.raise_error('not_email', field)
        return value

EmailValidatorInstance = EmailValidator()

class PatternValidator(StringValidator):
    # does the real work
    checker = PatternChecker.PatternChecker()
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    property_names = StringValidator.property_names +\
                     ['pattern']

    pattern = fields.StringField('pattern',
                                 title="Pattern",
                                 required=1,
                                 default="",
                                 description=(
        "The pattern the value should conform to. Patterns are "
        "composed of digits ('d'), alphabetic characters ('e') and "
        "alphanumeric characters ('f'). Any other character in the pattern "
        "should appear literally in the value in that place. Internal "
        "whitespace is checked as well but may be included in any amount. "
        "Example: 'dddd ee' is a Dutch zipcode (postcode). "
        "NOTE: currently experimental and details may change!")
                                 )

    message_names = StringValidator.message_names +\
                    ['pattern_not_matched']

    pattern_not_matched = "The entered value did not match the pattern."

    def validate(self, field, key, REQUEST):
        value = StringValidator.validate(self, field, key, REQUEST)
        if value == "" and not field.get_value('required'):
            return value
        value = self.checker.validate_value([field.get_value('pattern')],
                                            value)
        if value is None:
            self.raise_error('pattern_not_matched', field)
        return value

PatternValidatorInstance = PatternValidator()

class BooleanValidator(Validator):
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    property_names = Validator.property_names + ['required']

    required = fields.CheckBoxField('required',
                                title='Required',
                                description=(
    "Checked if the field is required; the user has to check."),
                                default=0)

    message_names = Validator.message_names + ['required_not_found']

    required_not_found = 'This field is mandatory.'

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    def validate(self, field, key, REQUEST):
      result = REQUEST.get(key, REQUEST.get('default_%s' % key))
      if result is None:
        raise KeyError('Field %r is not present in request object.' % field.id)
      # XXX If the checkbox is hidden, Widget_render_hidden is used instead of
      #     CheckBoxWidget_render, and ':int' suffix is missing.
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      value = result and result != '0' and 1 or 0
      if not value and field.get_value('required'):
        self.raise_error('required_not_found', field)
      return value
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BooleanValidatorInstance = BooleanValidator()

class IntegerValidator(StringBaseValidator):
    property_names = StringBaseValidator.property_names +\
                     ['start', 'end']

    start = fields.IntegerField('start',
                                title='Start',
                                description=(
        "The integer entered by the user must be larger than or equal to "
        "this value. If left empty, there is no minimum."),
                                default="",
                                required=0)

    end = fields.IntegerField('end',
                              title='End',
                              description=(
        "The integer entered by the user must be smaller than this "
        "value. If left empty, there is no maximum."),
                              default="",
                              required=0)

    message_names = StringBaseValidator.message_names +\
                    ['not_integer', 'integer_out_of_range']

    not_integer = 'You did not enter an integer.'
    integer_out_of_range = 'The integer you entered was out of range.'

    def validate(self, field, key, REQUEST):
      value = StringBaseValidator.validate(self, field, key, REQUEST)
      # we need to add this check again
      if value == "" and not field.get_value('required'):
        return value
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      value = normalizeFullWidthNumber(value)
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      try:
        if value.find(' ')>0:
          value = value.replace(' ','')
        value = int(value)
      except ValueError:
        self.raise_error('not_integer', field)

      start = field.get_value('start')
      end = field.get_value('end')
      if start != "" and value < start:
        self.raise_error('integer_out_of_range', field)
      if end != "" and value >= end:
        self.raise_error('integer_out_of_range', field)
      return value

IntegerValidatorInstance = IntegerValidator()

class FloatValidator(StringBaseValidator):
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  message_names = StringBaseValidator.message_names + ['not_float',
                                                       'too_large_precision']
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  not_float = "You did not enter a floating point number."
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  too_large_precision = "The number you input has too large precision."

  def _validatePrecision(self, field, value, decimal_point, input_style):
    """ Validate the consistency among the precision and the user inputs """
    if not field.has_value('precision'):
      return value
    precision = field.get_value('precision')
    if precision == '' or precision is None:
      # need to validate when the precision is 0
      return value
    index = value.find(decimal_point)
    if index < 0:
      return value
    input_precision_length = len(value[index+1:])
    if input_precision_length > int(precision):
      self.raise_error('too_large_precision', field)
    return value
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  def validate(self, field, key, REQUEST):
    value = StringBaseValidator.validate(self, field, key, REQUEST)
    if value == "" and not field.get_value('required'):
      return value
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    value = normalizeFullWidthNumber(value)
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    input_style = field.get_value('input_style')
    decimal_separator = ''
    decimal_point = '.'

    if input_style == "-1234.5":
      decimal_point = '.'
    elif input_style == '-1 234.5':
      decimal_separator = ' '
      decimal_point = '.'
    elif input_style == '-1 234,5':
      decimal_separator = ' '
      decimal_point = ','
    elif input_style == '-1.234,5':
      decimal_separator = '.'
      decimal_point = ','
    elif input_style == '-1,234.5':
      decimal_separator = ','
      decimal_point = '.'

    value = value.replace(decimal_separator,'')
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    input_style = field.get_value('input_style')
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    if value.find(decimal_point) >= 0:
      value = value.replace(decimal_point, '.')
    if value.find('%') >= 0:
      value = value.replace('%', '')
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    value = self._validatePrecision(field, value, decimal_point, input_style)
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    try:
      value = float(value)
      if input_style.find('%')>=0:
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        value = value / 100
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    except ValueError:
      self.raise_error('not_float', field)
    return value

FloatValidatorInstance = FloatValidator()

class LinesValidator(StringBaseValidator):
  property_names = StringBaseValidator.property_names +\
                    ['unicode', 'max_lines', 'max_linelength', 'max_length']

  unicode = fields.CheckBoxField('unicode',
                                  title='Unicode',
                                  description=(
      "Checked if the field delivers a unicode string instead of an "
      "8-bit string."),
                                  default=0)

  max_lines = fields.IntegerField('max_lines',
                                  title='Maximum lines',
                                  description=(
      "The maximum amount of lines a user can enter. If set to 0, "
      "or is left empty, there is no maximum."),
                                  default="",
                                  required=0)

  max_linelength = fields.IntegerField('max_linelength',
                                        title="Maximum length of line",
                                        description=(
      "The maximum length of a line. If set to 0 or is left empty, there "
      "is no maximum."),
                                        default="",
                                        required=0)

  max_length = fields.IntegerField('max_length',
                                    title="Maximum length (in characters)",
                                    description=(
      "The maximum total length in characters that the user may enter. "
      "If set to 0 or is left empty, there is no maximum."),
                                    default="",
                                    required=0)

  message_names = StringBaseValidator.message_names +\
                  ['too_many_lines', 'line_too_long', 'too_long']

  too_many_lines = 'You entered too many lines.'
  line_too_long = 'A line was too long.'
  too_long = 'You entered too many characters.'

  def validate(self, field, key, REQUEST):
    value = StringBaseValidator.validate(self, field, key, REQUEST)
    # Added as a patch for hidden values
    if isinstance(value, (list, tuple)):
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      value = '\n'.join(value)
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    # we need to add this check again
    if value == "" and not field.get_value('required'):
      return []
    if field.get_value('unicode'):
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        value = six.text_type(value, field.get_form_encoding())
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    # check whether the entire input is too long
    max_length = field.get_value('max_length') or 0
    if max_length and len(value) > max_length:
      self.raise_error('too_long', field)
    # split input into separate lines
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    lines = value.replace('\r\n', '\n').split('\n')
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    # check whether we have too many lines
    max_lines = field.get_value('max_lines') or 0
    if max_lines and len(lines) > max_lines:
      self.raise_error('too_many_lines', field)

    # strip extraneous data from lines and check whether each line is
    # short enough
    max_linelength = field.get_value('max_linelength') or 0
    result = []
    whitespace_preserve = field.get_value('whitespace_preserve')
    for line in lines:
      if not whitespace_preserve:
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        line = line.strip()
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      if max_linelength and len(line) > max_linelength:
        self.raise_error('line_too_long', field)
      result.append(line)

    return result

LinesValidatorInstance = LinesValidator()

class TextValidator(LinesValidator):
    def validate(self, field, key, REQUEST):
        value = LinesValidator.validate(self, field, key, REQUEST)
        # we need to add this check again
        if value == [] and not field.get_value('required'):
            return ""

        # join everything into string again with \n and return
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        return "\n".join(value)
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TextValidatorInstance = TextValidator()

class SelectionValidator(StringBaseValidator):

    property_names = StringBaseValidator.property_names +\
                     ['unicode']

    unicode = fields.CheckBoxField('unicode',
                                   title='Unicode',
                                   description=(
        "Checked if the field delivers a unicode string instead of an "
        "8-bit string."),
                                   default=0)
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    message_names = StringBaseValidator.message_names +\
                    ['unknown_selection']

    unknown_selection = 'You selected an item that was not in the list.'
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    def validate(self, field, key, REQUEST):
      value = StringBaseValidator.validate(self, field, key, REQUEST)

      if value == "" and not field.get_value('required'):
        return value

      # get the text and the value from the list of items
      for item in list(field.get_value('items', cell=getattr(REQUEST,'cell',None))) + [field.get_value('default', cell=getattr(REQUEST,'cell',None))]:
        try:
          item_text, item_value = item
        except (ValueError, TypeError):
          item_text = item
          item_value = item

        # check if the value is equal to the string/unicode version of
        # item_value; if that's the case, we can return the *original*
        # value in the list (not the submitted value). This way, integers
        # will remain integers.
        # XXX it is impossible with the UI currently to fill in unicode
        # items, but it's possible to do it with the TALES tab
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        if field.get_value('unicode') and isinstance(item_value, six.text_type):
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          str_value = item_value.encode(field.get_form_encoding())
        else:
          str_value = str(item_value)

        if str_value == value:
          return item_value

      # if we didn't find the value, return error
      self.raise_error('unknown_selection', field)

SelectionValidatorInstance = SelectionValidator()

class MultiSelectionValidator(Validator):
    property_names = Validator.property_names + ['required', 'unicode']

    required = fields.CheckBoxField('required',
                                    title='Required',
                                    description=(
        "Checked if the field is required; the user has to fill in some "
        "data."),
                                    default=1)

    unicode = fields.CheckBoxField('unicode',
                                   title='Unicode',
                                   description=(
        "Checked if the field delivers a unicode string instead of an "
        "8-bit string."),
                                   default=0)

    message_names = Validator.message_names + ['required_not_found',
                                               'unknown_selection']
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    required_not_found = 'Input is required but no input given.'
    unknown_selection = 'You selected an item that was not in the list.'
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    def validate(self, field, key, REQUEST):
      if REQUEST.get('default_%s' % (key, )) is None:
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        raise KeyError('Field %r is not present in request object (marker field default_%s not found).' % (field.id, key))
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      values = REQUEST.get(key, [])
      # NOTE: a hack to deal with single item selections
      if not isinstance(values, list):
        # put whatever we got in a list
        values = [values]
      # if we selected nothing and entry is required, give error, otherwise
      # give entry list
      if len(values) == 0:
        if field.get_value('required'):
          self.raise_error('required_not_found', field)
        else:
          return values
      # convert everything to unicode if necessary
      if field.get_value('unicode'):
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        values = [six.text_type(value, field.get_form_encoding())
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                    for value in values]

      # create a dictionary of possible values
      value_dict = {}
      for item in field.get_value('items', cell=getattr(REQUEST,'cell',None)): # Patch by JPS for Listbox
        try:
          item_text, item_value = item
        except ValueError:
          item_text = item
          item_value = item
        value_dict[item_value] = 0
      default_value = field.get_value('default', cell=getattr(REQUEST,'cell',None))
      if isinstance(default_value, (list, tuple)):
        for v in default_value:
          value_dict[v] = 0
      else:
        value_dict[default_value] = 0


      # check whether all values are in dictionary
      result = []
      for value in values:
        # FIXME: hack to accept int values as well
        try:
          int_value = int(value)
        except ValueError:
          int_value = None
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        if int_value is not None and int_value in value_dict:
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          result.append(int_value)
          continue
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        if value in value_dict:
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          result.append(value)
          continue
        self.raise_error('unknown_selection', field)
      # everything checks out
      return result

MultiSelectionValidatorInstance = MultiSelectionValidator()

class FileValidator(Validator):
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    required = fields.CheckBoxField('required',
                                    title='Required',
                                    description=(
                                      "Checked if the field is required; the "
                                      "user has to fill in some data."),
                                    default=0)
    property_names = Validator.property_names + ['required']

    message_names = Validator.message_names + ['required_not_found']
    required_not_found = 'Input is required but no input given.'

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    def validate(self, field, key, REQUEST):
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        value = REQUEST.get(key, None)
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        if field.get_value('required') and value in (None, ''):
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                  self.raise_error('required_not_found', field)
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        return value
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FileValidatorInstance = FileValidator()

class LinkHelper:
    """A helper class to check if links are openable.
    """
    status = 0

    def __init__(self, link):
        self.link = link
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    def open(self):
        try:
            urlopen(self.link)
        except:
            # all errors will definitely result in a failure
            pass
        else:
            # FIXME: would like to check for 404 errors and such?
            self.status = 1

class LinkValidator(StringValidator):
    property_names = StringValidator.property_names +\
                     ['check_link', 'check_timeout', 'link_type']
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    check_link = fields.CheckBoxField('check_link',
                                      title='Check Link',
                                      description=(
        "Check whether the link is not broken."),
                                      default=0)

    check_timeout = fields.FloatField('check_timeout',
                                      title='Check Timeout',
                                      description=(
        "Maximum amount of seconds to check link. Required"),
                                      default=7.0,
                                      required=1)
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    link_type = fields.ListField('link_type',
                                 title='Type of Link',
                                 default="external",
                                 size=1,
                                 items=[('External Link', 'external'),
                                        ('Internal Link', 'internal'),
                                        ('Relative Link', 'relative')],
                                 description=(
        "Define the type of the link. Required."),
                                 required=1)
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    message_names = StringValidator.message_names + ['not_link']
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    not_link = 'The specified link is broken.'
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    def validate(self, field, key, REQUEST):
        value = StringValidator.validate(self, field, key, REQUEST)
        if value == "" and not field.get_value('required'):
            return value
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        link_type = field.get_value('link_type')
        if link_type == 'internal':
            value = urljoin(REQUEST['BASE0'], value)
        elif link_type == 'relative':
            value = urljoin(REQUEST['URL1'], value)
        # otherwise must be external

        # FIXME: should try regular expression to do some more checking here?
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        # if we don't need to check the link, we're done now
        if not field.get_value('check_link'):
            return value

        # resolve internal links using Zope's resolve_url
        if link_type in ['internal', 'relative']:
            try:
                REQUEST.resolve_url(value)
            except:
                self.raise_error('not_link', field)
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        # check whether we can open the link
        link = LinkHelper(value)
        thread = Thread(target=link.open)
        thread.start()
        thread.join(field.get_value('check_timeout'))
        del thread
        if not link.status:
            self.raise_error('not_link', field)

        return value

LinkValidatorInstance = LinkValidator()

class DateTimeValidator(Validator):
  """
    Added support for key in every call to validate_sub_field
  """
  property_names = Validator.property_names + ['required',
                                                'start_datetime',
                                                'end_datetime',
                                                'allow_empty_time']

  required = fields.CheckBoxField('required',
                                  title='Required',
                                  description=(
      "Checked if the field is required; the user has to enter something "
      "in the field."),
                                  default=1)

  start_datetime = fields.DateTimeField('start_datetime',
                                        title="Start datetime",
                                        description=(
      "The date and time entered must be later than or equal to "
      "this date/time. If left empty, no check is performed."),
                                        default=None,
                                        input_style="text",
                                        required=0)

  end_datetime = fields.DateTimeField('end_datetime',
                                      title="End datetime",
                                      description=(
      "The date and time entered must be earlier than "
      "this date/time. If left empty, no check is performed."),
                                      default=None,
                                      input_style="text",
                                      required=0)

  allow_empty_time = fields.CheckBoxField('allow_empty_time',
                                          title="Allow empty time",
                                          description=(
      "Allow time to be left empty. Time will default to midnight "
      "on that date."),
                                          default=0)

  message_names = Validator.message_names + ['required_not_found',
                                              'not_datetime',
                                              'datetime_out_of_range']

  required_not_found = 'Input is required but no input given.'
  not_datetime = 'You did not enter a valid date and time.'
  datetime_out_of_range = 'The date and time you entered were out of range.'

  def validate(self, field, key, REQUEST):
    try:
      year = field.validate_sub_field('year', REQUEST, key=key)
      month = field.validate_sub_field('month', REQUEST, key=key)
      if field.get_value('hide_day'):
        day = 1
      else:
        day = field.validate_sub_field('day', REQUEST, key=key)

      if field.get_value('date_only'):
        hour = 0
        minute = 0
      elif field.get_value('allow_empty_time'):
          hour = field.validate_sub_field('hour', REQUEST, key=key)
          minute = field.validate_sub_field('minute', REQUEST, key=key)
          if hour == '' and minute == '':
            hour = 0
            minute = 0
          elif hour == '' or minute == '':
            raise ValidationError('not_datetime', field)
      else:
        hour = field.validate_sub_field('hour', REQUEST, key=key)
        minute = field.validate_sub_field('minute', REQUEST, key=key)
    except ValidationError:
      self.raise_error('not_datetime', field)

    # handling of completely empty sub fields
    if ((year == '' and month == '') and
        (field.get_value('hide_day') or day == '') and
        (field.get_value('date_only') or (hour == '' and minute == '')
        or (hour == 0 and minute == 0))):
      if field.get_value('required'):
        self.raise_error('required_not_found', field)
      else:
        # field is not required, return None for no entry
        return None
    # handling of partially empty sub fields; invalid datetime
    if ((year == '' or month == '') or
        (not field.get_value('hide_day') and day == '') or
        (not field.get_value('date_only') and
        (hour == '' or minute == ''))):
      self.raise_error('not_datetime', field)

    if field.get_value('ampm_time_style'):
      ampm = field.validate_sub_field('ampm', REQUEST, key=key)
      if field.get_value('allow_empty_time'):
        if ampm == '':
          ampm = 'am'
      hour = int(hour)
      # handling not am or pm
      # handling hour > 12
      if ((ampm != 'am') and (ampm != 'pm')) or (hour > 12):
        self.raise_error('not_datetime', field)
      if (ampm == 'pm') and (hour == 0):
        self.raise_error('not_datetime', field)
      elif ampm == 'pm' and hour < 12:
        hour += 12

    # handle possible timezone input
    timezone = ''
    if field.get_value('timezone_style'):
      timezone =  field.validate_sub_field('timezone', REQUEST, key=key)

    try:
      # handling of hidden day, which can be first or last day of the month:
      if field.get_value('hidden_day_is_last_day'):
        if int(month) == 12:
          tmp_year = int(year) + 1
          tmp_month = 1
        else:
          tmp_year = int(year)
          tmp_month = int(month) + 1
        tmp_day = DateTime(tmp_year, tmp_month, 1, hour, minute)
        result = tmp_day - 1
      else:
        result = DateTime(int(year),
                          int(month),
                          int(day),
                          hour,
                          minute)
        year = result.year()
        result = DateTime('%s/%s/%s %s:%s %s' % (year,
                            int(month),
                            int(day),
                            hour,
                            minute, timezone))
      # ugh, a host of string based exceptions (not since Zope 2.7)
    except ('DateTimeError', 'Invalid Date Components', 'TimeError',
            DateError, TimeError) :
      self.raise_error('not_datetime', field)
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    # pass value through request in order to be restored in case if validation fail
    if getattr(REQUEST, 'form', None):
      REQUEST.form[key] = result
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    # check if things are within range
    start_datetime = field.get_value('start_datetime')
    if (start_datetime not in (None, '') and
      result < start_datetime):
      self.raise_error('datetime_out_of_range', field)
    end_datetime = field.get_value('end_datetime')
    if (end_datetime not in (None, '') and
      result >= end_datetime):
      self.raise_error('datetime_out_of_range', field)

    return result

DateTimeValidatorInstance = DateTimeValidator()

class SuppressValidator(ValidatorBase):
    """A validator that is actually not used.
863
    """
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    def need_validate(self, field, key, REQUEST):
        """Don't ever validate; suppress result in output.
        """
        return 0
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869
SuppressValidatorInstance = SuppressValidator()
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fullwidth_minus_character_list = (
    u'\u2010',
    u'\u2011',
    u'\u2012',
    u'\u2013',
    u'\u2014',
    u'\u2015',
    u'\u2212',
    u'\u30fc',
    u'\uff0d',
    )
def normalizeFullWidthNumber(value):
  try:
    value = unicodedata.normalize('NFKD', value.decode('UTF8'))
    if value[0] in fullwidth_minus_character_list:
      value = u'-' + value[1:]
    value = value.encode('ASCII', 'ignore')
  except UnicodeDecodeError:
    pass
  return value