617 lines
25 KiB
Python
617 lines
25 KiB
Python
"""
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Field classes
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"""
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import datetime
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import re
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import time
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from django.utils.translation import ugettext
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from django.utils.encoding import StrAndUnicode, smart_unicode
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from util import ErrorList, ValidationError
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from widgets import TextInput, PasswordInput, HiddenInput, MultipleHiddenInput, FileInput, CheckboxInput, Select, NullBooleanSelect, SelectMultiple
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try:
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from decimal import Decimal, DecimalException
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except ImportError:
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from django.utils._decimal import Decimal, DecimalException
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__all__ = (
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'Field', 'CharField', 'IntegerField',
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'DEFAULT_DATE_INPUT_FORMATS', 'DateField',
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'DEFAULT_TIME_INPUT_FORMATS', 'TimeField',
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'DEFAULT_DATETIME_INPUT_FORMATS', 'DateTimeField',
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'RegexField', 'EmailField', 'FileField', 'ImageField', 'URLField', 'BooleanField',
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'ChoiceField', 'NullBooleanField', 'MultipleChoiceField',
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'ComboField', 'MultiValueField', 'FloatField', 'DecimalField',
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'SplitDateTimeField',
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)
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# These values, if given to to_python(), will trigger the self.required check.
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EMPTY_VALUES = (None, '')
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try:
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set
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except NameError:
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from sets import Set as set # Python 2.3 fallback
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try:
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from decimal import Decimal
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except ImportError:
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from django.utils._decimal import Decimal # Python 2.3 fallback
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class Field(object):
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widget = TextInput # Default widget to use when rendering this type of Field.
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hidden_widget = HiddenInput # Default widget to use when rendering this as "hidden".
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# Tracks each time a Field instance is created. Used to retain order.
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creation_counter = 0
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def __init__(self, required=True, widget=None, label=None, initial=None, help_text=None):
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# required -- Boolean that specifies whether the field is required.
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# True by default.
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# widget -- A Widget class, or instance of a Widget class, that should
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# be used for this Field when displaying it. Each Field has a
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# default Widget that it'll use if you don't specify this. In
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# most cases, the default widget is TextInput.
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# label -- A verbose name for this field, for use in displaying this
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# field in a form. By default, Django will use a "pretty"
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# version of the form field name, if the Field is part of a
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# Form.
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# initial -- A value to use in this Field's initial display. This value
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# is *not* used as a fallback if data isn't given.
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# help_text -- An optional string to use as "help text" for this Field.
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if label is not None:
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label = smart_unicode(label)
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self.required, self.label, self.initial = required, label, initial
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self.help_text = smart_unicode(help_text or '')
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widget = widget or self.widget
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if isinstance(widget, type):
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widget = widget()
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# Hook into self.widget_attrs() for any Field-specific HTML attributes.
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extra_attrs = self.widget_attrs(widget)
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if extra_attrs:
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widget.attrs.update(extra_attrs)
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self.widget = widget
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# Increase the creation counter, and save our local copy.
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self.creation_counter = Field.creation_counter
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Field.creation_counter += 1
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def clean(self, value):
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"""
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Validates the given value and returns its "cleaned" value as an
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appropriate Python object.
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Raises ValidationError for any errors.
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"""
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if self.required and value in EMPTY_VALUES:
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raise ValidationError(ugettext(u'This field is required.'))
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return value
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def widget_attrs(self, widget):
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"""
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Given a Widget instance (*not* a Widget class), returns a dictionary of
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any HTML attributes that should be added to the Widget, based on this
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Field.
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"""
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return {}
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class CharField(Field):
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def __init__(self, max_length=None, min_length=None, *args, **kwargs):
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self.max_length, self.min_length = max_length, min_length
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super(CharField, self).__init__(*args, **kwargs)
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def clean(self, value):
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"Validates max_length and min_length. Returns a Unicode object."
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super(CharField, self).clean(value)
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if value in EMPTY_VALUES:
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return u''
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value = smart_unicode(value)
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value_length = len(value)
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if self.max_length is not None and value_length > self.max_length:
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raise ValidationError(ugettext(u'Ensure this value has at most %(max)d characters (it has %(length)d).') % {'max': self.max_length, 'length': value_length})
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if self.min_length is not None and value_length < self.min_length:
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raise ValidationError(ugettext(u'Ensure this value has at least %(min)d characters (it has %(length)d).') % {'min': self.min_length, 'length': value_length})
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return value
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def widget_attrs(self, widget):
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if self.max_length is not None and isinstance(widget, (TextInput, PasswordInput)):
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# The HTML attribute is maxlength, not max_length.
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return {'maxlength': str(self.max_length)}
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class IntegerField(Field):
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def __init__(self, max_value=None, min_value=None, *args, **kwargs):
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self.max_value, self.min_value = max_value, min_value
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super(IntegerField, self).__init__(*args, **kwargs)
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def clean(self, value):
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"""
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Validates that int() can be called on the input. Returns the result
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of int(). Returns None for empty values.
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"""
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super(IntegerField, self).clean(value)
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if value in EMPTY_VALUES:
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return None
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try:
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value = int(value)
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except (ValueError, TypeError):
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raise ValidationError(ugettext(u'Enter a whole number.'))
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if self.max_value is not None and value > self.max_value:
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raise ValidationError(ugettext(u'Ensure this value is less than or equal to %s.') % self.max_value)
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if self.min_value is not None and value < self.min_value:
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raise ValidationError(ugettext(u'Ensure this value is greater than or equal to %s.') % self.min_value)
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return value
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class FloatField(Field):
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def __init__(self, max_value=None, min_value=None, *args, **kwargs):
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self.max_value, self.min_value = max_value, min_value
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Field.__init__(self, *args, **kwargs)
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def clean(self, value):
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"""
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Validates that float() can be called on the input. Returns a float.
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Returns None for empty values.
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"""
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super(FloatField, self).clean(value)
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if not self.required and value in EMPTY_VALUES:
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return None
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try:
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value = float(value)
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except (ValueError, TypeError):
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raise ValidationError(ugettext('Enter a number.'))
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if self.max_value is not None and value > self.max_value:
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raise ValidationError(ugettext('Ensure this value is less than or equal to %s.') % self.max_value)
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if self.min_value is not None and value < self.min_value:
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raise ValidationError(ugettext('Ensure this value is greater than or equal to %s.') % self.min_value)
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return value
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class DecimalField(Field):
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def __init__(self, max_value=None, min_value=None, max_digits=None, decimal_places=None, *args, **kwargs):
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self.max_value, self.min_value = max_value, min_value
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self.max_digits, self.decimal_places = max_digits, decimal_places
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Field.__init__(self, *args, **kwargs)
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def clean(self, value):
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"""
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Validates that the input is a decimal number. Returns a Decimal
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instance. Returns None for empty values. Ensures that there are no more
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than max_digits in the number, and no more than decimal_places digits
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after the decimal point.
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"""
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super(DecimalField, self).clean(value)
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if not self.required and value in EMPTY_VALUES:
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return None
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value = value.strip()
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try:
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value = Decimal(value)
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except DecimalException:
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raise ValidationError(ugettext('Enter a number.'))
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pieces = str(value).lstrip("-").split('.')
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decimals = (len(pieces) == 2) and len(pieces[1]) or 0
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digits = len(pieces[0])
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if self.max_value is not None and value > self.max_value:
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raise ValidationError(ugettext('Ensure this value is less than or equal to %s.') % self.max_value)
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if self.min_value is not None and value < self.min_value:
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raise ValidationError(ugettext('Ensure this value is greater than or equal to %s.') % self.min_value)
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if self.max_digits is not None and (digits + decimals) > self.max_digits:
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raise ValidationError(ugettext('Ensure that there are no more than %s digits in total.') % self.max_digits)
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if self.decimal_places is not None and decimals > self.decimal_places:
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raise ValidationError(ugettext('Ensure that there are no more than %s decimal places.') % self.decimal_places)
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if self.max_digits is not None and self.decimal_places is not None and digits > (self.max_digits - self.decimal_places):
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raise ValidationError(ugettext('Ensure that there are no more than %s digits before the decimal point.') % (self.max_digits - self.decimal_places))
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return value
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DEFAULT_DATE_INPUT_FORMATS = (
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'%Y-%m-%d', '%m/%d/%Y', '%m/%d/%y', # '2006-10-25', '10/25/2006', '10/25/06'
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'%b %d %Y', '%b %d, %Y', # 'Oct 25 2006', 'Oct 25, 2006'
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'%d %b %Y', '%d %b, %Y', # '25 Oct 2006', '25 Oct, 2006'
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'%B %d %Y', '%B %d, %Y', # 'October 25 2006', 'October 25, 2006'
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'%d %B %Y', '%d %B, %Y', # '25 October 2006', '25 October, 2006'
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)
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class DateField(Field):
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def __init__(self, input_formats=None, *args, **kwargs):
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super(DateField, self).__init__(*args, **kwargs)
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self.input_formats = input_formats or DEFAULT_DATE_INPUT_FORMATS
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def clean(self, value):
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"""
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Validates that the input can be converted to a date. Returns a Python
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datetime.date object.
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"""
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super(DateField, self).clean(value)
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if value in EMPTY_VALUES:
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return None
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if isinstance(value, datetime.datetime):
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return value.date()
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if isinstance(value, datetime.date):
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return value
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for format in self.input_formats:
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try:
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return datetime.date(*time.strptime(value, format)[:3])
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except ValueError:
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continue
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raise ValidationError(ugettext(u'Enter a valid date.'))
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DEFAULT_TIME_INPUT_FORMATS = (
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'%H:%M:%S', # '14:30:59'
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'%H:%M', # '14:30'
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)
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class TimeField(Field):
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def __init__(self, input_formats=None, *args, **kwargs):
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super(TimeField, self).__init__(*args, **kwargs)
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self.input_formats = input_formats or DEFAULT_TIME_INPUT_FORMATS
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def clean(self, value):
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"""
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Validates that the input can be converted to a time. Returns a Python
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datetime.time object.
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"""
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super(TimeField, self).clean(value)
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if value in EMPTY_VALUES:
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return None
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if isinstance(value, datetime.time):
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return value
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for format in self.input_formats:
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try:
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return datetime.time(*time.strptime(value, format)[3:6])
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except ValueError:
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continue
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raise ValidationError(ugettext(u'Enter a valid time.'))
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DEFAULT_DATETIME_INPUT_FORMATS = (
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'%Y-%m-%d %H:%M:%S', # '2006-10-25 14:30:59'
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'%Y-%m-%d %H:%M', # '2006-10-25 14:30'
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'%Y-%m-%d', # '2006-10-25'
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'%m/%d/%Y %H:%M:%S', # '10/25/2006 14:30:59'
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'%m/%d/%Y %H:%M', # '10/25/2006 14:30'
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'%m/%d/%Y', # '10/25/2006'
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'%m/%d/%y %H:%M:%S', # '10/25/06 14:30:59'
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'%m/%d/%y %H:%M', # '10/25/06 14:30'
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'%m/%d/%y', # '10/25/06'
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)
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class DateTimeField(Field):
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def __init__(self, input_formats=None, *args, **kwargs):
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super(DateTimeField, self).__init__(*args, **kwargs)
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self.input_formats = input_formats or DEFAULT_DATETIME_INPUT_FORMATS
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def clean(self, value):
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"""
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Validates that the input can be converted to a datetime. Returns a
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Python datetime.datetime object.
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"""
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super(DateTimeField, self).clean(value)
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if value in EMPTY_VALUES:
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return None
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if isinstance(value, datetime.datetime):
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return value
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if isinstance(value, datetime.date):
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return datetime.datetime(value.year, value.month, value.day)
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for format in self.input_formats:
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try:
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return datetime.datetime(*time.strptime(value, format)[:6])
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except ValueError:
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continue
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raise ValidationError(ugettext(u'Enter a valid date/time.'))
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class RegexField(CharField):
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def __init__(self, regex, max_length=None, min_length=None, error_message=None, *args, **kwargs):
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"""
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regex can be either a string or a compiled regular expression object.
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error_message is an optional error message to use, if
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'Enter a valid value' is too generic for you.
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"""
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super(RegexField, self).__init__(max_length, min_length, *args, **kwargs)
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if isinstance(regex, basestring):
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regex = re.compile(regex)
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self.regex = regex
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self.error_message = error_message or ugettext(u'Enter a valid value.')
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def clean(self, value):
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"""
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Validates that the input matches the regular expression. Returns a
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Unicode object.
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"""
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value = super(RegexField, self).clean(value)
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if value == u'':
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return value
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if not self.regex.search(value):
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raise ValidationError(self.error_message)
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return value
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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}$', re.IGNORECASE) # domain
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class EmailField(RegexField):
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def __init__(self, max_length=None, min_length=None, *args, **kwargs):
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RegexField.__init__(self, email_re, max_length, min_length,
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ugettext(u'Enter a valid e-mail address.'), *args, **kwargs)
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url_re = re.compile(
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r'^https?://' # http:// or https://
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r'(?:[A-Z0-9-]+\.)+[A-Z]{2,6}' # domain
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r'(?::\d+)?' # optional port
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r'(?:/?|/\S+)$', re.IGNORECASE)
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try:
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from django.conf import settings
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URL_VALIDATOR_USER_AGENT = settings.URL_VALIDATOR_USER_AGENT
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except (ImportError, EnvironmentError):
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# It's OK if Django settings aren't configured.
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URL_VALIDATOR_USER_AGENT = 'Django (http://www.djangoproject.com/)'
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class UploadedFile(StrAndUnicode):
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"A wrapper for files uploaded in a FileField"
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def __init__(self, filename, content):
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self.filename = filename
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self.content = content
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def __unicode__(self):
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"""
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The unicode representation is the filename, so that the pre-database-insertion
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logic can use UploadedFile objects
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"""
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return self.filename
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class FileField(Field):
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widget = FileInput
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def __init__(self, *args, **kwargs):
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super(FileField, self).__init__(*args, **kwargs)
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def clean(self, data):
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super(FileField, self).clean(data)
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if not self.required and data in EMPTY_VALUES:
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return None
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try:
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f = UploadedFile(data['filename'], data['content'])
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except TypeError:
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raise ValidationError(ugettext(u"No file was submitted. Check the encoding type on the form."))
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except KeyError:
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raise ValidationError(ugettext(u"No file was submitted."))
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if not f.content:
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raise ValidationError(ugettext(u"The submitted file is empty."))
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return f
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class ImageField(FileField):
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def clean(self, 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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f = super(ImageField, self).clean(data)
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if f is None:
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return None
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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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Image.open(StringIO(f.content))
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except (IOError, OverflowError): # Python Imaging Library doesn't recognize it as an image
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# OverflowError is due to a bug in PIL with Python 2.4+ which can cause
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# it to gag on OLE files.
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raise ValidationError(ugettext(u"Upload a valid image. The file you uploaded was either not an image or a corrupted image."))
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return f
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class URLField(RegexField):
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def __init__(self, max_length=None, min_length=None, verify_exists=False,
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validator_user_agent=URL_VALIDATOR_USER_AGENT, *args, **kwargs):
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super(URLField, self).__init__(url_re, max_length, min_length, ugettext(u'Enter a valid URL.'), *args, **kwargs)
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self.verify_exists = verify_exists
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self.user_agent = validator_user_agent
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def clean(self, value):
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value = super(URLField, self).clean(value)
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if value == u'':
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return value
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if self.verify_exists:
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import urllib2
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from django.conf import settings
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headers = {
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"Accept": "text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5",
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"Accept-Language": "en-us,en;q=0.5",
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"Accept-Charset": "ISO-8859-1,utf-8;q=0.7,*;q=0.7",
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"Connection": "close",
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"User-Agent": self.user_agent,
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}
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try:
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req = urllib2.Request(value, None, headers)
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u = urllib2.urlopen(req)
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except ValueError:
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raise ValidationError(ugettext(u'Enter a valid URL.'))
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except: # urllib2.URLError, httplib.InvalidURL, etc.
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raise ValidationError(ugettext(u'This URL appears to be a broken link.'))
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return value
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class BooleanField(Field):
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widget = CheckboxInput
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def clean(self, value):
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"Returns a Python boolean object."
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super(BooleanField, self).clean(value)
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return bool(value)
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class NullBooleanField(BooleanField):
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"""
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A field whose valid values are None, True and False. Invalid values are
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cleaned to None.
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"""
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widget = NullBooleanSelect
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def clean(self, value):
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return {True: True, False: False}.get(value, None)
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class ChoiceField(Field):
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widget = Select
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def __init__(self, choices=(), required=True, widget=None, label=None, initial=None, help_text=None):
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super(ChoiceField, self).__init__(required, widget, label, initial, help_text)
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self.choices = choices
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def _get_choices(self):
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return self._choices
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def _set_choices(self, value):
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# Setting choices also sets the choices on the widget.
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# choices can be any iterable, but we call list() on it because
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# it will be consumed more than once.
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self._choices = self.widget.choices = list(value)
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choices = property(_get_choices, _set_choices)
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def clean(self, value):
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"""
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Validates that the input is in self.choices.
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"""
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value = super(ChoiceField, self).clean(value)
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if value in EMPTY_VALUES:
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value = u''
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value = smart_unicode(value)
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if value == u'':
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return value
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valid_values = set([smart_unicode(k) for k, v in self.choices])
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if value not in valid_values:
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raise ValidationError(ugettext(u'Select a valid choice. That choice is not one of the available choices.'))
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return value
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class MultipleChoiceField(ChoiceField):
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hidden_widget = MultipleHiddenInput
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widget = SelectMultiple
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def clean(self, value):
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"""
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Validates that the input is a list or tuple.
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"""
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if self.required and not value:
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raise ValidationError(ugettext(u'This field is required.'))
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elif not self.required and not value:
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return []
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if not isinstance(value, (list, tuple)):
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raise ValidationError(ugettext(u'Enter a list of values.'))
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new_value = [smart_unicode(val) for val in value]
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# Validate that each value in the value list is in self.choices.
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valid_values = set([smart_unicode(k) for k, v in self.choices])
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for val in new_value:
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if val not in valid_values:
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raise ValidationError(ugettext(u'Select a valid choice. %s is not one of the available choices.') % val)
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return new_value
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class ComboField(Field):
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"""
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A Field whose clean() method calls multiple Field clean() methods.
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"""
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def __init__(self, fields=(), *args, **kwargs):
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super(ComboField, self).__init__(*args, **kwargs)
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# Set 'required' to False on the individual fields, because the
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# required validation will be handled by ComboField, not by those
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# individual fields.
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for f in fields:
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f.required = False
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self.fields = fields
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def clean(self, value):
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"""
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Validates the given value against all of self.fields, which is a
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list of Field instances.
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"""
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super(ComboField, self).clean(value)
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for field in self.fields:
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value = field.clean(value)
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return value
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class MultiValueField(Field):
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"""
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A Field that aggregates the logic of multiple Fields.
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Its clean() method takes a "decompressed" list of values, which are then
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cleaned into a single value according to self.fields. Each value in
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this list is cleaned by the corresponding field -- the first value is
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cleaned by the first field, the second value is cleaned by the second
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field, etc. Once all fields are cleaned, the list of clean values is
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"compressed" into a single value.
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Subclasses should not have to implement clean(). Instead, they must
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implement compress(), which takes a list of valid values and returns a
|
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"compressed" version of those values -- a single value.
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You'll probably want to use this with MultiWidget.
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"""
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def __init__(self, fields=(), *args, **kwargs):
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super(MultiValueField, self).__init__(*args, **kwargs)
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# Set 'required' to False on the individual fields, because the
|
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# required validation will be handled by MultiValueField, not by those
|
|
# individual fields.
|
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for f in fields:
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f.required = False
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self.fields = fields
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|
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def clean(self, value):
|
|
"""
|
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Validates every value in the given list. A value is validated against
|
|
the corresponding Field in self.fields.
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|
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For example, if this MultiValueField was instantiated with
|
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fields=(DateField(), TimeField()), clean() would call
|
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DateField.clean(value[0]) and TimeField.clean(value[1]).
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"""
|
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clean_data = []
|
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errors = ErrorList()
|
|
if not value or isinstance(value, (list, tuple)):
|
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if not value or not [v for v in value if v not in EMPTY_VALUES]:
|
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if self.required:
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raise ValidationError(ugettext(u'This field is required.'))
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else:
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return self.compress([])
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else:
|
|
raise ValidationError(ugettext(u'Enter a list of values.'))
|
|
for i, field in enumerate(self.fields):
|
|
try:
|
|
field_value = value[i]
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except IndexError:
|
|
field_value = None
|
|
if self.required and field_value in EMPTY_VALUES:
|
|
raise ValidationError(ugettext(u'This field is required.'))
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try:
|
|
clean_data.append(field.clean(field_value))
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except ValidationError, e:
|
|
# Collect all validation errors in a single list, which we'll
|
|
# raise at the end of clean(), rather than raising a single
|
|
# exception for the first error we encounter.
|
|
errors.extend(e.messages)
|
|
if errors:
|
|
raise ValidationError(errors)
|
|
return self.compress(clean_data)
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|
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def compress(self, data_list):
|
|
"""
|
|
Returns a single value for the given list of values. The values can be
|
|
assumed to be valid.
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|
|
|
For example, if this MultiValueField was instantiated with
|
|
fields=(DateField(), TimeField()), this might return a datetime
|
|
object created by combining the date and time in data_list.
|
|
"""
|
|
raise NotImplementedError('Subclasses must implement this method.')
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|
|
|
class SplitDateTimeField(MultiValueField):
|
|
def __init__(self, *args, **kwargs):
|
|
fields = (DateField(), TimeField())
|
|
super(SplitDateTimeField, self).__init__(fields, *args, **kwargs)
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|
|
|
def compress(self, data_list):
|
|
if data_list:
|
|
# Raise a validation error if time or date is empty
|
|
# (possible if SplitDateTimeField has required=False).
|
|
if data_list[0] in EMPTY_VALUES:
|
|
raise ValidationError(ugettext(u'Enter a valid date.'))
|
|
if data_list[1] in EMPTY_VALUES:
|
|
raise ValidationError(ugettext(u'Enter a valid time.'))
|
|
return datetime.datetime.combine(*data_list)
|
|
return None
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