1391 lines
47 KiB
Python
1391 lines
47 KiB
Python
"""
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Field classes.
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"""
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import copy
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import datetime
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import json
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import math
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import operator
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import os
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import re
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import uuid
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from decimal import Decimal, DecimalException
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from io import BytesIO
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from urllib.parse import urlsplit, urlunsplit
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from django.core import validators
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from django.core.exceptions import ValidationError
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from django.forms.boundfield import BoundField
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from django.forms.utils import from_current_timezone, to_current_timezone
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from django.forms.widgets import (
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FILE_INPUT_CONTRADICTION,
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CheckboxInput,
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ClearableFileInput,
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DateInput,
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DateTimeInput,
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EmailInput,
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FileInput,
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HiddenInput,
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MultipleHiddenInput,
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NullBooleanSelect,
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NumberInput,
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Select,
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SelectMultiple,
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SplitDateTimeWidget,
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SplitHiddenDateTimeWidget,
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Textarea,
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TextInput,
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TimeInput,
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URLInput,
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)
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from django.utils import formats
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from django.utils.dateparse import parse_datetime, parse_duration
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from django.utils.duration import duration_string
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from django.utils.ipv6 import clean_ipv6_address
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from django.utils.regex_helper import _lazy_re_compile
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from django.utils.translation import gettext_lazy as _
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from django.utils.translation import ngettext_lazy
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__all__ = (
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"Field",
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"CharField",
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"IntegerField",
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"DateField",
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"TimeField",
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"DateTimeField",
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"DurationField",
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"RegexField",
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"EmailField",
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"FileField",
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"ImageField",
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"URLField",
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"BooleanField",
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"NullBooleanField",
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"ChoiceField",
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"MultipleChoiceField",
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"ComboField",
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"MultiValueField",
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"FloatField",
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"DecimalField",
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"SplitDateTimeField",
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"GenericIPAddressField",
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"FilePathField",
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"JSONField",
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"SlugField",
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"TypedChoiceField",
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"TypedMultipleChoiceField",
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"UUIDField",
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)
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class Field:
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widget = TextInput # Default widget to use when rendering this type of Field.
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hidden_widget = (
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HiddenInput # Default widget to use when rendering this as "hidden".
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)
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default_validators = [] # Default set of validators
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# Add an 'invalid' entry to default_error_message if you want a specific
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# field error message not raised by the field validators.
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default_error_messages = {
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"required": _("This field is required."),
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}
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empty_values = list(validators.EMPTY_VALUES)
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def __init__(
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self,
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*,
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required=True,
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widget=None,
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label=None,
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initial=None,
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help_text="",
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error_messages=None,
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show_hidden_initial=False,
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validators=(),
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localize=False,
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disabled=False,
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label_suffix=None,
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):
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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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# error_messages -- An optional dictionary to override the default
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# messages that the field will raise.
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# show_hidden_initial -- Boolean that specifies if it is needed to render a
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# hidden widget with initial value after widget.
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# validators -- List of additional validators to use
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# localize -- Boolean that specifies if the field should be localized.
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# disabled -- Boolean that specifies whether the field is disabled, that
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# is its widget is shown in the form but not editable.
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# label_suffix -- Suffix to be added to the label. Overrides
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# form's label_suffix.
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self.required, self.label, self.initial = required, label, initial
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self.show_hidden_initial = show_hidden_initial
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self.help_text = help_text
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self.disabled = disabled
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self.label_suffix = label_suffix
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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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else:
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widget = copy.deepcopy(widget)
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# Trigger the localization machinery if needed.
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self.localize = localize
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if self.localize:
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widget.is_localized = True
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# Let the widget know whether it should display as required.
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widget.is_required = self.required
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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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messages = {}
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for c in reversed(self.__class__.__mro__):
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messages.update(getattr(c, "default_error_messages", {}))
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messages.update(error_messages or {})
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self.error_messages = messages
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self.validators = [*self.default_validators, *validators]
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super().__init__()
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def prepare_value(self, value):
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return value
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def to_python(self, value):
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return value
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def validate(self, value):
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if value in self.empty_values and self.required:
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raise ValidationError(self.error_messages["required"], code="required")
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def run_validators(self, value):
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if value in self.empty_values:
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return
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errors = []
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for v in self.validators:
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try:
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v(value)
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except ValidationError as e:
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if hasattr(e, "code") and e.code in self.error_messages:
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e.message = self.error_messages[e.code]
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errors.extend(e.error_list)
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if errors:
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raise ValidationError(errors)
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def clean(self, value):
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"""
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Validate the given value and return its "cleaned" value as an
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appropriate Python object. Raise ValidationError for any errors.
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"""
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value = self.to_python(value)
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self.validate(value)
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self.run_validators(value)
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return value
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def bound_data(self, data, initial):
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"""
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Return the value that should be shown for this field on render of a
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bound form, given the submitted POST data for the field and the initial
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data, if any.
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For most fields, this will simply be data; FileFields need to handle it
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a bit differently.
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"""
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if self.disabled:
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return initial
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return data
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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), return 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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def has_changed(self, initial, data):
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"""Return True if data differs from initial."""
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# Always return False if the field is disabled since self.bound_data
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# always uses the initial value in this case.
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if self.disabled:
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return False
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try:
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data = self.to_python(data)
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if hasattr(self, "_coerce"):
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return self._coerce(data) != self._coerce(initial)
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except ValidationError:
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return True
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# For purposes of seeing whether something has changed, None is
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# the same as an empty string, if the data or initial value we get
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# is None, replace it with ''.
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initial_value = initial if initial is not None else ""
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data_value = data if data is not None else ""
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return initial_value != data_value
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def get_bound_field(self, form, field_name):
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"""
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Return a BoundField instance that will be used when accessing the form
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field in a template.
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"""
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return BoundField(form, self, field_name)
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def __deepcopy__(self, memo):
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result = copy.copy(self)
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memo[id(self)] = result
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result.widget = copy.deepcopy(self.widget, memo)
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result.error_messages = self.error_messages.copy()
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result.validators = self.validators[:]
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return result
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class CharField(Field):
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def __init__(
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self, *, max_length=None, min_length=None, strip=True, empty_value="", **kwargs
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):
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self.max_length = max_length
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self.min_length = min_length
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self.strip = strip
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self.empty_value = empty_value
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super().__init__(**kwargs)
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if min_length is not None:
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self.validators.append(validators.MinLengthValidator(int(min_length)))
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if max_length is not None:
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self.validators.append(validators.MaxLengthValidator(int(max_length)))
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self.validators.append(validators.ProhibitNullCharactersValidator())
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def to_python(self, value):
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"""Return a string."""
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if value not in self.empty_values:
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value = str(value)
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if self.strip:
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value = value.strip()
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if value in self.empty_values:
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return self.empty_value
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return value
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def widget_attrs(self, widget):
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attrs = super().widget_attrs(widget)
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if self.max_length is not None and not widget.is_hidden:
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# The HTML attribute is maxlength, not max_length.
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attrs["maxlength"] = str(self.max_length)
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if self.min_length is not None and not widget.is_hidden:
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# The HTML attribute is minlength, not min_length.
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attrs["minlength"] = str(self.min_length)
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return attrs
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class IntegerField(Field):
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widget = NumberInput
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default_error_messages = {
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"invalid": _("Enter a whole number."),
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}
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re_decimal = _lazy_re_compile(r"\.0*\s*$")
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def __init__(self, *, max_value=None, min_value=None, step_size=None, **kwargs):
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self.max_value, self.min_value, self.step_size = max_value, min_value, step_size
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if kwargs.get("localize") and self.widget == NumberInput:
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# Localized number input is not well supported on most browsers
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kwargs.setdefault("widget", super().widget)
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super().__init__(**kwargs)
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if max_value is not None:
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self.validators.append(validators.MaxValueValidator(max_value))
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if min_value is not None:
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self.validators.append(validators.MinValueValidator(min_value))
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if step_size is not None:
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self.validators.append(validators.StepValueValidator(step_size))
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def to_python(self, value):
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"""
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Validate that int() can be called on the input. Return the result
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of int() or None for empty values.
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"""
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value = super().to_python(value)
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if value in self.empty_values:
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return None
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if self.localize:
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value = formats.sanitize_separators(value)
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# Strip trailing decimal and zeros.
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try:
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value = int(self.re_decimal.sub("", str(value)))
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except (ValueError, TypeError):
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raise ValidationError(self.error_messages["invalid"], code="invalid")
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return value
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def widget_attrs(self, widget):
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attrs = super().widget_attrs(widget)
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if isinstance(widget, NumberInput):
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if self.min_value is not None:
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attrs["min"] = self.min_value
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if self.max_value is not None:
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attrs["max"] = self.max_value
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if self.step_size is not None:
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attrs["step"] = self.step_size
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return attrs
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|
|
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class FloatField(IntegerField):
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default_error_messages = {
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"invalid": _("Enter a number."),
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}
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def to_python(self, value):
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"""
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Validate that float() can be called on the input. Return the result
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of float() or None for empty values.
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"""
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value = super(IntegerField, self).to_python(value)
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if value in self.empty_values:
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return None
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if self.localize:
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value = formats.sanitize_separators(value)
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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(self.error_messages["invalid"], code="invalid")
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return value
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def validate(self, value):
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super().validate(value)
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if value in self.empty_values:
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return
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if not math.isfinite(value):
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raise ValidationError(self.error_messages["invalid"], code="invalid")
|
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def widget_attrs(self, widget):
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attrs = super().widget_attrs(widget)
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if isinstance(widget, NumberInput) and "step" not in widget.attrs:
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if self.step_size is not None:
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step = str(self.step_size)
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else:
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step = "any"
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attrs.setdefault("step", step)
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return attrs
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|
|
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class DecimalField(IntegerField):
|
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default_error_messages = {
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"invalid": _("Enter a number."),
|
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}
|
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def __init__(
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self,
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*,
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max_value=None,
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min_value=None,
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max_digits=None,
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decimal_places=None,
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**kwargs,
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):
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self.max_digits, self.decimal_places = max_digits, decimal_places
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super().__init__(max_value=max_value, min_value=min_value, **kwargs)
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self.validators.append(validators.DecimalValidator(max_digits, decimal_places))
|
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def to_python(self, value):
|
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"""
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Validate that the input is a decimal number. Return a Decimal
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instance or None for empty values. Ensure 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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if value in self.empty_values:
|
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return None
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if self.localize:
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value = formats.sanitize_separators(value)
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try:
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value = Decimal(str(value))
|
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except DecimalException:
|
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raise ValidationError(self.error_messages["invalid"], code="invalid")
|
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return value
|
|
|
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def validate(self, value):
|
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super().validate(value)
|
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if value in self.empty_values:
|
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return
|
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if not value.is_finite():
|
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raise ValidationError(
|
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self.error_messages["invalid"],
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code="invalid",
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params={"value": value},
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)
|
|
|
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def widget_attrs(self, widget):
|
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attrs = super().widget_attrs(widget)
|
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if isinstance(widget, NumberInput) and "step" not in widget.attrs:
|
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if self.decimal_places is not None:
|
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# Use exponential notation for small values since they might
|
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# be parsed as 0 otherwise. ref #20765
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step = str(Decimal(1).scaleb(-self.decimal_places)).lower()
|
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else:
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step = "any"
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attrs.setdefault("step", step)
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return attrs
|
|
|
|
|
|
class BaseTemporalField(Field):
|
|
def __init__(self, *, input_formats=None, **kwargs):
|
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super().__init__(**kwargs)
|
|
if input_formats is not None:
|
|
self.input_formats = input_formats
|
|
|
|
def to_python(self, value):
|
|
value = value.strip()
|
|
# Try to strptime against each input format.
|
|
for format in self.input_formats:
|
|
try:
|
|
return self.strptime(value, format)
|
|
except (ValueError, TypeError):
|
|
continue
|
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raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
|
|
def strptime(self, value, format):
|
|
raise NotImplementedError("Subclasses must define this method.")
|
|
|
|
|
|
class DateField(BaseTemporalField):
|
|
widget = DateInput
|
|
input_formats = formats.get_format_lazy("DATE_INPUT_FORMATS")
|
|
default_error_messages = {
|
|
"invalid": _("Enter a valid date."),
|
|
}
|
|
|
|
def to_python(self, value):
|
|
"""
|
|
Validate that the input can be converted to a date. Return a Python
|
|
datetime.date object.
|
|
"""
|
|
if value in self.empty_values:
|
|
return None
|
|
if isinstance(value, datetime.datetime):
|
|
return value.date()
|
|
if isinstance(value, datetime.date):
|
|
return value
|
|
return super().to_python(value)
|
|
|
|
def strptime(self, value, format):
|
|
return datetime.datetime.strptime(value, format).date()
|
|
|
|
|
|
class TimeField(BaseTemporalField):
|
|
widget = TimeInput
|
|
input_formats = formats.get_format_lazy("TIME_INPUT_FORMATS")
|
|
default_error_messages = {"invalid": _("Enter a valid time.")}
|
|
|
|
def to_python(self, value):
|
|
"""
|
|
Validate that the input can be converted to a time. Return a Python
|
|
datetime.time object.
|
|
"""
|
|
if value in self.empty_values:
|
|
return None
|
|
if isinstance(value, datetime.time):
|
|
return value
|
|
return super().to_python(value)
|
|
|
|
def strptime(self, value, format):
|
|
return datetime.datetime.strptime(value, format).time()
|
|
|
|
|
|
class DateTimeFormatsIterator:
|
|
def __iter__(self):
|
|
yield from formats.get_format("DATETIME_INPUT_FORMATS")
|
|
yield from formats.get_format("DATE_INPUT_FORMATS")
|
|
|
|
|
|
class DateTimeField(BaseTemporalField):
|
|
widget = DateTimeInput
|
|
input_formats = DateTimeFormatsIterator()
|
|
default_error_messages = {
|
|
"invalid": _("Enter a valid date/time."),
|
|
}
|
|
|
|
def prepare_value(self, value):
|
|
if isinstance(value, datetime.datetime):
|
|
value = to_current_timezone(value)
|
|
return value
|
|
|
|
def to_python(self, value):
|
|
"""
|
|
Validate that the input can be converted to a datetime. Return a
|
|
Python datetime.datetime object.
|
|
"""
|
|
if value in self.empty_values:
|
|
return None
|
|
if isinstance(value, datetime.datetime):
|
|
return from_current_timezone(value)
|
|
if isinstance(value, datetime.date):
|
|
result = datetime.datetime(value.year, value.month, value.day)
|
|
return from_current_timezone(result)
|
|
try:
|
|
result = parse_datetime(value.strip())
|
|
except ValueError:
|
|
raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
if not result:
|
|
result = super().to_python(value)
|
|
return from_current_timezone(result)
|
|
|
|
def strptime(self, value, format):
|
|
return datetime.datetime.strptime(value, format)
|
|
|
|
|
|
class DurationField(Field):
|
|
default_error_messages = {
|
|
"invalid": _("Enter a valid duration."),
|
|
"overflow": _("The number of days must be between {min_days} and {max_days}."),
|
|
}
|
|
|
|
def prepare_value(self, value):
|
|
if isinstance(value, datetime.timedelta):
|
|
return duration_string(value)
|
|
return value
|
|
|
|
def to_python(self, value):
|
|
if value in self.empty_values:
|
|
return None
|
|
if isinstance(value, datetime.timedelta):
|
|
return value
|
|
try:
|
|
value = parse_duration(str(value))
|
|
except OverflowError:
|
|
raise ValidationError(
|
|
self.error_messages["overflow"].format(
|
|
min_days=datetime.timedelta.min.days,
|
|
max_days=datetime.timedelta.max.days,
|
|
),
|
|
code="overflow",
|
|
)
|
|
if value is None:
|
|
raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
return value
|
|
|
|
|
|
class RegexField(CharField):
|
|
def __init__(self, regex, **kwargs):
|
|
"""
|
|
regex can be either a string or a compiled regular expression object.
|
|
"""
|
|
kwargs.setdefault("strip", False)
|
|
super().__init__(**kwargs)
|
|
self._set_regex(regex)
|
|
|
|
def _get_regex(self):
|
|
return self._regex
|
|
|
|
def _set_regex(self, regex):
|
|
if isinstance(regex, str):
|
|
regex = re.compile(regex)
|
|
self._regex = regex
|
|
if (
|
|
hasattr(self, "_regex_validator")
|
|
and self._regex_validator in self.validators
|
|
):
|
|
self.validators.remove(self._regex_validator)
|
|
self._regex_validator = validators.RegexValidator(regex=regex)
|
|
self.validators.append(self._regex_validator)
|
|
|
|
regex = property(_get_regex, _set_regex)
|
|
|
|
|
|
class EmailField(CharField):
|
|
widget = EmailInput
|
|
default_validators = [validators.validate_email]
|
|
|
|
def __init__(self, **kwargs):
|
|
super().__init__(strip=True, **kwargs)
|
|
|
|
|
|
class FileField(Field):
|
|
widget = ClearableFileInput
|
|
default_error_messages = {
|
|
"invalid": _("No file was submitted. Check the encoding type on the form."),
|
|
"missing": _("No file was submitted."),
|
|
"empty": _("The submitted file is empty."),
|
|
"max_length": ngettext_lazy(
|
|
"Ensure this filename has at most %(max)d character (it has %(length)d).",
|
|
"Ensure this filename has at most %(max)d characters (it has %(length)d).",
|
|
"max",
|
|
),
|
|
"contradiction": _(
|
|
"Please either submit a file or check the clear checkbox, not both."
|
|
),
|
|
}
|
|
|
|
def __init__(self, *, max_length=None, allow_empty_file=False, **kwargs):
|
|
self.max_length = max_length
|
|
self.allow_empty_file = allow_empty_file
|
|
super().__init__(**kwargs)
|
|
|
|
def to_python(self, data):
|
|
if data in self.empty_values:
|
|
return None
|
|
|
|
# UploadedFile objects should have name and size attributes.
|
|
try:
|
|
file_name = data.name
|
|
file_size = data.size
|
|
except AttributeError:
|
|
raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
|
|
if self.max_length is not None and len(file_name) > self.max_length:
|
|
params = {"max": self.max_length, "length": len(file_name)}
|
|
raise ValidationError(
|
|
self.error_messages["max_length"], code="max_length", params=params
|
|
)
|
|
if not file_name:
|
|
raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
if not self.allow_empty_file and not file_size:
|
|
raise ValidationError(self.error_messages["empty"], code="empty")
|
|
|
|
return data
|
|
|
|
def clean(self, data, initial=None):
|
|
# If the widget got contradictory inputs, we raise a validation error
|
|
if data is FILE_INPUT_CONTRADICTION:
|
|
raise ValidationError(
|
|
self.error_messages["contradiction"], code="contradiction"
|
|
)
|
|
# False means the field value should be cleared; further validation is
|
|
# not needed.
|
|
if data is False:
|
|
if not self.required:
|
|
return False
|
|
# If the field is required, clearing is not possible (the widget
|
|
# shouldn't return False data in that case anyway). False is not
|
|
# in self.empty_value; if a False value makes it this far
|
|
# it should be validated from here on out as None (so it will be
|
|
# caught by the required check).
|
|
data = None
|
|
if not data and initial:
|
|
return initial
|
|
return super().clean(data)
|
|
|
|
def bound_data(self, data, initial):
|
|
if data in (None, FILE_INPUT_CONTRADICTION):
|
|
return initial
|
|
return data
|
|
|
|
def has_changed(self, initial, data):
|
|
return not self.disabled and data is not None
|
|
|
|
|
|
class ImageField(FileField):
|
|
default_validators = [validators.validate_image_file_extension]
|
|
default_error_messages = {
|
|
"invalid_image": _(
|
|
"Upload a valid image. The file you uploaded was either not an "
|
|
"image or a corrupted image."
|
|
),
|
|
}
|
|
|
|
def to_python(self, data):
|
|
"""
|
|
Check that the file-upload field data contains a valid image (GIF, JPG,
|
|
PNG, etc. -- whatever Pillow supports).
|
|
"""
|
|
f = super().to_python(data)
|
|
if f is None:
|
|
return None
|
|
|
|
from PIL import Image
|
|
|
|
# We need to get a file object for Pillow. We might have a path or we might
|
|
# have to read the data into memory.
|
|
if hasattr(data, "temporary_file_path"):
|
|
file = data.temporary_file_path()
|
|
else:
|
|
if hasattr(data, "read"):
|
|
file = BytesIO(data.read())
|
|
else:
|
|
file = BytesIO(data["content"])
|
|
|
|
try:
|
|
# load() could spot a truncated JPEG, but it loads the entire
|
|
# image in memory, which is a DoS vector. See #3848 and #18520.
|
|
image = Image.open(file)
|
|
# verify() must be called immediately after the constructor.
|
|
image.verify()
|
|
|
|
# Annotating so subclasses can reuse it for their own validation
|
|
f.image = image
|
|
# Pillow doesn't detect the MIME type of all formats. In those
|
|
# cases, content_type will be None.
|
|
f.content_type = Image.MIME.get(image.format)
|
|
except Exception as exc:
|
|
# Pillow doesn't recognize it as an image.
|
|
raise ValidationError(
|
|
self.error_messages["invalid_image"],
|
|
code="invalid_image",
|
|
) from exc
|
|
if hasattr(f, "seek") and callable(f.seek):
|
|
f.seek(0)
|
|
return f
|
|
|
|
def widget_attrs(self, widget):
|
|
attrs = super().widget_attrs(widget)
|
|
if isinstance(widget, FileInput) and "accept" not in widget.attrs:
|
|
attrs.setdefault("accept", "image/*")
|
|
return attrs
|
|
|
|
|
|
class URLField(CharField):
|
|
widget = URLInput
|
|
default_error_messages = {
|
|
"invalid": _("Enter a valid URL."),
|
|
}
|
|
default_validators = [validators.URLValidator()]
|
|
|
|
def __init__(self, **kwargs):
|
|
super().__init__(strip=True, **kwargs)
|
|
|
|
def to_python(self, value):
|
|
def split_url(url):
|
|
"""
|
|
Return a list of url parts via urlparse.urlsplit(), or raise
|
|
ValidationError for some malformed URLs.
|
|
"""
|
|
try:
|
|
return list(urlsplit(url))
|
|
except ValueError:
|
|
# urlparse.urlsplit can raise a ValueError with some
|
|
# misformatted URLs.
|
|
raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
|
|
value = super().to_python(value)
|
|
if value:
|
|
url_fields = split_url(value)
|
|
if not url_fields[0]:
|
|
# If no URL scheme given, assume http://
|
|
url_fields[0] = "http"
|
|
if not url_fields[1]:
|
|
# Assume that if no domain is provided, that the path segment
|
|
# contains the domain.
|
|
url_fields[1] = url_fields[2]
|
|
url_fields[2] = ""
|
|
# Rebuild the url_fields list, since the domain segment may now
|
|
# contain the path too.
|
|
url_fields = split_url(urlunsplit(url_fields))
|
|
value = urlunsplit(url_fields)
|
|
return value
|
|
|
|
|
|
class BooleanField(Field):
|
|
widget = CheckboxInput
|
|
|
|
def to_python(self, value):
|
|
"""Return a Python boolean object."""
|
|
# Explicitly check for the string 'False', which is what a hidden field
|
|
# will submit for False. Also check for '0', since this is what
|
|
# RadioSelect will provide. Because bool("True") == bool('1') == True,
|
|
# we don't need to handle that explicitly.
|
|
if isinstance(value, str) and value.lower() in ("false", "0"):
|
|
value = False
|
|
else:
|
|
value = bool(value)
|
|
return super().to_python(value)
|
|
|
|
def validate(self, value):
|
|
if not value and self.required:
|
|
raise ValidationError(self.error_messages["required"], code="required")
|
|
|
|
def has_changed(self, initial, data):
|
|
if self.disabled:
|
|
return False
|
|
# Sometimes data or initial may be a string equivalent of a boolean
|
|
# so we should run it through to_python first to get a boolean value
|
|
return self.to_python(initial) != self.to_python(data)
|
|
|
|
|
|
class NullBooleanField(BooleanField):
|
|
"""
|
|
A field whose valid values are None, True, and False. Clean invalid values
|
|
to None.
|
|
"""
|
|
|
|
widget = NullBooleanSelect
|
|
|
|
def to_python(self, value):
|
|
"""
|
|
Explicitly check for the string 'True' and 'False', which is what a
|
|
hidden field will submit for True and False, for 'true' and 'false',
|
|
which are likely to be returned by JavaScript serializations of forms,
|
|
and for '1' and '0', which is what a RadioField will submit. Unlike
|
|
the Booleanfield, this field must check for True because it doesn't
|
|
use the bool() function.
|
|
"""
|
|
if value in (True, "True", "true", "1"):
|
|
return True
|
|
elif value in (False, "False", "false", "0"):
|
|
return False
|
|
else:
|
|
return None
|
|
|
|
def validate(self, value):
|
|
pass
|
|
|
|
|
|
class CallableChoiceIterator:
|
|
def __init__(self, choices_func):
|
|
self.choices_func = choices_func
|
|
|
|
def __iter__(self):
|
|
yield from self.choices_func()
|
|
|
|
|
|
class ChoiceField(Field):
|
|
widget = Select
|
|
default_error_messages = {
|
|
"invalid_choice": _(
|
|
"Select a valid choice. %(value)s is not one of the available choices."
|
|
),
|
|
}
|
|
|
|
def __init__(self, *, choices=(), **kwargs):
|
|
super().__init__(**kwargs)
|
|
self.choices = choices
|
|
|
|
def __deepcopy__(self, memo):
|
|
result = super().__deepcopy__(memo)
|
|
result._choices = copy.deepcopy(self._choices, memo)
|
|
return result
|
|
|
|
def _get_choices(self):
|
|
return self._choices
|
|
|
|
def _set_choices(self, value):
|
|
# Setting choices also sets the choices on the widget.
|
|
# choices can be any iterable, but we call list() on it because
|
|
# it will be consumed more than once.
|
|
if callable(value):
|
|
value = CallableChoiceIterator(value)
|
|
else:
|
|
value = list(value)
|
|
|
|
self._choices = self.widget.choices = value
|
|
|
|
choices = property(_get_choices, _set_choices)
|
|
|
|
def to_python(self, value):
|
|
"""Return a string."""
|
|
if value in self.empty_values:
|
|
return ""
|
|
return str(value)
|
|
|
|
def validate(self, value):
|
|
"""Validate that the input is in self.choices."""
|
|
super().validate(value)
|
|
if value and not self.valid_value(value):
|
|
raise ValidationError(
|
|
self.error_messages["invalid_choice"],
|
|
code="invalid_choice",
|
|
params={"value": value},
|
|
)
|
|
|
|
def valid_value(self, value):
|
|
"""Check to see if the provided value is a valid choice."""
|
|
text_value = str(value)
|
|
for k, v in self.choices:
|
|
if isinstance(v, (list, tuple)):
|
|
# This is an optgroup, so look inside the group for options
|
|
for k2, v2 in v:
|
|
if value == k2 or text_value == str(k2):
|
|
return True
|
|
else:
|
|
if value == k or text_value == str(k):
|
|
return True
|
|
return False
|
|
|
|
|
|
class TypedChoiceField(ChoiceField):
|
|
def __init__(self, *, coerce=lambda val: val, empty_value="", **kwargs):
|
|
self.coerce = coerce
|
|
self.empty_value = empty_value
|
|
super().__init__(**kwargs)
|
|
|
|
def _coerce(self, value):
|
|
"""
|
|
Validate that the value can be coerced to the right type (if not empty).
|
|
"""
|
|
if value == self.empty_value or value in self.empty_values:
|
|
return self.empty_value
|
|
try:
|
|
value = self.coerce(value)
|
|
except (ValueError, TypeError, ValidationError):
|
|
raise ValidationError(
|
|
self.error_messages["invalid_choice"],
|
|
code="invalid_choice",
|
|
params={"value": value},
|
|
)
|
|
return value
|
|
|
|
def clean(self, value):
|
|
value = super().clean(value)
|
|
return self._coerce(value)
|
|
|
|
|
|
class MultipleChoiceField(ChoiceField):
|
|
hidden_widget = MultipleHiddenInput
|
|
widget = SelectMultiple
|
|
default_error_messages = {
|
|
"invalid_choice": _(
|
|
"Select a valid choice. %(value)s is not one of the available choices."
|
|
),
|
|
"invalid_list": _("Enter a list of values."),
|
|
}
|
|
|
|
def to_python(self, value):
|
|
if not value:
|
|
return []
|
|
elif not isinstance(value, (list, tuple)):
|
|
raise ValidationError(
|
|
self.error_messages["invalid_list"], code="invalid_list"
|
|
)
|
|
return [str(val) for val in value]
|
|
|
|
def validate(self, value):
|
|
"""Validate that the input is a list or tuple."""
|
|
if self.required and not value:
|
|
raise ValidationError(self.error_messages["required"], code="required")
|
|
# Validate that each value in the value list is in self.choices.
|
|
for val in value:
|
|
if not self.valid_value(val):
|
|
raise ValidationError(
|
|
self.error_messages["invalid_choice"],
|
|
code="invalid_choice",
|
|
params={"value": val},
|
|
)
|
|
|
|
def has_changed(self, initial, data):
|
|
if self.disabled:
|
|
return False
|
|
if initial is None:
|
|
initial = []
|
|
if data is None:
|
|
data = []
|
|
if len(initial) != len(data):
|
|
return True
|
|
initial_set = {str(value) for value in initial}
|
|
data_set = {str(value) for value in data}
|
|
return data_set != initial_set
|
|
|
|
|
|
class TypedMultipleChoiceField(MultipleChoiceField):
|
|
def __init__(self, *, coerce=lambda val: val, **kwargs):
|
|
self.coerce = coerce
|
|
self.empty_value = kwargs.pop("empty_value", [])
|
|
super().__init__(**kwargs)
|
|
|
|
def _coerce(self, value):
|
|
"""
|
|
Validate that the values are in self.choices and can be coerced to the
|
|
right type.
|
|
"""
|
|
if value == self.empty_value or value in self.empty_values:
|
|
return self.empty_value
|
|
new_value = []
|
|
for choice in value:
|
|
try:
|
|
new_value.append(self.coerce(choice))
|
|
except (ValueError, TypeError, ValidationError):
|
|
raise ValidationError(
|
|
self.error_messages["invalid_choice"],
|
|
code="invalid_choice",
|
|
params={"value": choice},
|
|
)
|
|
return new_value
|
|
|
|
def clean(self, value):
|
|
value = super().clean(value)
|
|
return self._coerce(value)
|
|
|
|
def validate(self, value):
|
|
if value != self.empty_value:
|
|
super().validate(value)
|
|
elif self.required:
|
|
raise ValidationError(self.error_messages["required"], code="required")
|
|
|
|
|
|
class ComboField(Field):
|
|
"""
|
|
A Field whose clean() method calls multiple Field clean() methods.
|
|
"""
|
|
|
|
def __init__(self, fields, **kwargs):
|
|
super().__init__(**kwargs)
|
|
# Set 'required' to False on the individual fields, because the
|
|
# required validation will be handled by ComboField, not by those
|
|
# individual fields.
|
|
for f in fields:
|
|
f.required = False
|
|
self.fields = fields
|
|
|
|
def clean(self, value):
|
|
"""
|
|
Validate the given value against all of self.fields, which is a
|
|
list of Field instances.
|
|
"""
|
|
super().clean(value)
|
|
for field in self.fields:
|
|
value = field.clean(value)
|
|
return value
|
|
|
|
|
|
class MultiValueField(Field):
|
|
"""
|
|
Aggregate the logic of multiple Fields.
|
|
|
|
Its clean() method takes a "decompressed" list of values, which are then
|
|
cleaned into a single value according to self.fields. Each value in
|
|
this list is cleaned by the corresponding field -- the first value is
|
|
cleaned by the first field, the second value is cleaned by the second
|
|
field, etc. Once all fields are cleaned, the list of clean values is
|
|
"compressed" into a single value.
|
|
|
|
Subclasses should not have to implement clean(). Instead, they must
|
|
implement compress(), which takes a list of valid values and returns a
|
|
"compressed" version of those values -- a single value.
|
|
|
|
You'll probably want to use this with MultiWidget.
|
|
"""
|
|
|
|
default_error_messages = {
|
|
"invalid": _("Enter a list of values."),
|
|
"incomplete": _("Enter a complete value."),
|
|
}
|
|
|
|
def __init__(self, fields, *, require_all_fields=True, **kwargs):
|
|
self.require_all_fields = require_all_fields
|
|
super().__init__(**kwargs)
|
|
for f in fields:
|
|
f.error_messages.setdefault("incomplete", self.error_messages["incomplete"])
|
|
if self.disabled:
|
|
f.disabled = True
|
|
if self.require_all_fields:
|
|
# Set 'required' to False on the individual fields, because the
|
|
# required validation will be handled by MultiValueField, not
|
|
# by those individual fields.
|
|
f.required = False
|
|
self.fields = fields
|
|
|
|
def __deepcopy__(self, memo):
|
|
result = super().__deepcopy__(memo)
|
|
result.fields = tuple(x.__deepcopy__(memo) for x in self.fields)
|
|
return result
|
|
|
|
def validate(self, value):
|
|
pass
|
|
|
|
def clean(self, value):
|
|
"""
|
|
Validate every value in the given list. A value is validated against
|
|
the corresponding Field in self.fields.
|
|
|
|
For example, if this MultiValueField was instantiated with
|
|
fields=(DateField(), TimeField()), clean() would call
|
|
DateField.clean(value[0]) and TimeField.clean(value[1]).
|
|
"""
|
|
clean_data = []
|
|
errors = []
|
|
if self.disabled and not isinstance(value, list):
|
|
value = self.widget.decompress(value)
|
|
if not value or isinstance(value, (list, tuple)):
|
|
if not value or not [v for v in value if v not in self.empty_values]:
|
|
if self.required:
|
|
raise ValidationError(
|
|
self.error_messages["required"], code="required"
|
|
)
|
|
else:
|
|
return self.compress([])
|
|
else:
|
|
raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
for i, field in enumerate(self.fields):
|
|
try:
|
|
field_value = value[i]
|
|
except IndexError:
|
|
field_value = None
|
|
if field_value in self.empty_values:
|
|
if self.require_all_fields:
|
|
# Raise a 'required' error if the MultiValueField is
|
|
# required and any field is empty.
|
|
if self.required:
|
|
raise ValidationError(
|
|
self.error_messages["required"], code="required"
|
|
)
|
|
elif field.required:
|
|
# Otherwise, add an 'incomplete' error to the list of
|
|
# collected errors and skip field cleaning, if a required
|
|
# field is empty.
|
|
if field.error_messages["incomplete"] not in errors:
|
|
errors.append(field.error_messages["incomplete"])
|
|
continue
|
|
try:
|
|
clean_data.append(field.clean(field_value))
|
|
except ValidationError as 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. Skip duplicates.
|
|
errors.extend(m for m in e.error_list if m not in errors)
|
|
if errors:
|
|
raise ValidationError(errors)
|
|
|
|
out = self.compress(clean_data)
|
|
self.validate(out)
|
|
self.run_validators(out)
|
|
return out
|
|
|
|
def compress(self, data_list):
|
|
"""
|
|
Return a single value for the given list of values. The values can be
|
|
assumed to be valid.
|
|
|
|
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.")
|
|
|
|
def has_changed(self, initial, data):
|
|
if self.disabled:
|
|
return False
|
|
if initial is None:
|
|
initial = ["" for x in range(0, len(data))]
|
|
else:
|
|
if not isinstance(initial, list):
|
|
initial = self.widget.decompress(initial)
|
|
for field, initial, data in zip(self.fields, initial, data):
|
|
try:
|
|
initial = field.to_python(initial)
|
|
except ValidationError:
|
|
return True
|
|
if field.has_changed(initial, data):
|
|
return True
|
|
return False
|
|
|
|
|
|
class FilePathField(ChoiceField):
|
|
def __init__(
|
|
self,
|
|
path,
|
|
*,
|
|
match=None,
|
|
recursive=False,
|
|
allow_files=True,
|
|
allow_folders=False,
|
|
**kwargs,
|
|
):
|
|
self.path, self.match, self.recursive = path, match, recursive
|
|
self.allow_files, self.allow_folders = allow_files, allow_folders
|
|
super().__init__(choices=(), **kwargs)
|
|
|
|
if self.required:
|
|
self.choices = []
|
|
else:
|
|
self.choices = [("", "---------")]
|
|
|
|
if self.match is not None:
|
|
self.match_re = re.compile(self.match)
|
|
|
|
if recursive:
|
|
for root, dirs, files in sorted(os.walk(self.path)):
|
|
if self.allow_files:
|
|
for f in sorted(files):
|
|
if self.match is None or self.match_re.search(f):
|
|
f = os.path.join(root, f)
|
|
self.choices.append((f, f.replace(path, "", 1)))
|
|
if self.allow_folders:
|
|
for f in sorted(dirs):
|
|
if f == "__pycache__":
|
|
continue
|
|
if self.match is None or self.match_re.search(f):
|
|
f = os.path.join(root, f)
|
|
self.choices.append((f, f.replace(path, "", 1)))
|
|
else:
|
|
choices = []
|
|
with os.scandir(self.path) as entries:
|
|
for f in entries:
|
|
if f.name == "__pycache__":
|
|
continue
|
|
if (
|
|
(self.allow_files and f.is_file())
|
|
or (self.allow_folders and f.is_dir())
|
|
) and (self.match is None or self.match_re.search(f.name)):
|
|
choices.append((f.path, f.name))
|
|
choices.sort(key=operator.itemgetter(1))
|
|
self.choices.extend(choices)
|
|
|
|
self.widget.choices = self.choices
|
|
|
|
|
|
class SplitDateTimeField(MultiValueField):
|
|
widget = SplitDateTimeWidget
|
|
hidden_widget = SplitHiddenDateTimeWidget
|
|
default_error_messages = {
|
|
"invalid_date": _("Enter a valid date."),
|
|
"invalid_time": _("Enter a valid time."),
|
|
}
|
|
|
|
def __init__(self, *, input_date_formats=None, input_time_formats=None, **kwargs):
|
|
errors = self.default_error_messages.copy()
|
|
if "error_messages" in kwargs:
|
|
errors.update(kwargs["error_messages"])
|
|
localize = kwargs.get("localize", False)
|
|
fields = (
|
|
DateField(
|
|
input_formats=input_date_formats,
|
|
error_messages={"invalid": errors["invalid_date"]},
|
|
localize=localize,
|
|
),
|
|
TimeField(
|
|
input_formats=input_time_formats,
|
|
error_messages={"invalid": errors["invalid_time"]},
|
|
localize=localize,
|
|
),
|
|
)
|
|
super().__init__(fields, **kwargs)
|
|
|
|
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 self.empty_values:
|
|
raise ValidationError(
|
|
self.error_messages["invalid_date"], code="invalid_date"
|
|
)
|
|
if data_list[1] in self.empty_values:
|
|
raise ValidationError(
|
|
self.error_messages["invalid_time"], code="invalid_time"
|
|
)
|
|
result = datetime.datetime.combine(*data_list)
|
|
return from_current_timezone(result)
|
|
return None
|
|
|
|
|
|
class GenericIPAddressField(CharField):
|
|
def __init__(self, *, protocol="both", unpack_ipv4=False, **kwargs):
|
|
self.unpack_ipv4 = unpack_ipv4
|
|
self.default_validators = validators.ip_address_validators(
|
|
protocol, unpack_ipv4
|
|
)[0]
|
|
super().__init__(**kwargs)
|
|
|
|
def to_python(self, value):
|
|
if value in self.empty_values:
|
|
return ""
|
|
value = value.strip()
|
|
if value and ":" in value:
|
|
return clean_ipv6_address(value, self.unpack_ipv4)
|
|
return value
|
|
|
|
|
|
class SlugField(CharField):
|
|
default_validators = [validators.validate_slug]
|
|
|
|
def __init__(self, *, allow_unicode=False, **kwargs):
|
|
self.allow_unicode = allow_unicode
|
|
if self.allow_unicode:
|
|
self.default_validators = [validators.validate_unicode_slug]
|
|
super().__init__(**kwargs)
|
|
|
|
|
|
class UUIDField(CharField):
|
|
default_error_messages = {
|
|
"invalid": _("Enter a valid UUID."),
|
|
}
|
|
|
|
def prepare_value(self, value):
|
|
if isinstance(value, uuid.UUID):
|
|
return str(value)
|
|
return value
|
|
|
|
def to_python(self, value):
|
|
value = super().to_python(value)
|
|
if value in self.empty_values:
|
|
return None
|
|
if not isinstance(value, uuid.UUID):
|
|
try:
|
|
value = uuid.UUID(value)
|
|
except ValueError:
|
|
raise ValidationError(self.error_messages["invalid"], code="invalid")
|
|
return value
|
|
|
|
|
|
class InvalidJSONInput(str):
|
|
pass
|
|
|
|
|
|
class JSONString(str):
|
|
pass
|
|
|
|
|
|
class JSONField(CharField):
|
|
default_error_messages = {
|
|
"invalid": _("Enter a valid JSON."),
|
|
}
|
|
widget = Textarea
|
|
|
|
def __init__(self, encoder=None, decoder=None, **kwargs):
|
|
self.encoder = encoder
|
|
self.decoder = decoder
|
|
super().__init__(**kwargs)
|
|
|
|
def to_python(self, value):
|
|
if self.disabled:
|
|
return value
|
|
if value in self.empty_values:
|
|
return None
|
|
elif isinstance(value, (list, dict, int, float, JSONString)):
|
|
return value
|
|
try:
|
|
converted = json.loads(value, cls=self.decoder)
|
|
except json.JSONDecodeError:
|
|
raise ValidationError(
|
|
self.error_messages["invalid"],
|
|
code="invalid",
|
|
params={"value": value},
|
|
)
|
|
if isinstance(converted, str):
|
|
return JSONString(converted)
|
|
else:
|
|
return converted
|
|
|
|
def bound_data(self, data, initial):
|
|
if self.disabled:
|
|
return initial
|
|
if data is None:
|
|
return None
|
|
try:
|
|
return json.loads(data, cls=self.decoder)
|
|
except json.JSONDecodeError:
|
|
return InvalidJSONInput(data)
|
|
|
|
def prepare_value(self, value):
|
|
if isinstance(value, InvalidJSONInput):
|
|
return value
|
|
return json.dumps(value, ensure_ascii=False, cls=self.encoder)
|
|
|
|
def has_changed(self, initial, data):
|
|
if super().has_changed(initial, data):
|
|
return True
|
|
# For purposes of seeing whether something has changed, True isn't the
|
|
# same as 1 and the order of keys doesn't matter.
|
|
return json.dumps(initial, sort_keys=True, cls=self.encoder) != json.dumps(
|
|
self.to_python(data), sort_keys=True, cls=self.encoder
|
|
)
|