forked from hdg700/django-dbsettings
/
values.py
391 lines (294 loc) · 12 KB
/
values.py
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from __future__ import unicode_literals
from django.utils import six
import datetime
from decimal import Decimal
from hashlib import md5
from os.path import join as pjoin
import time
import os
from django import forms
from django.conf import settings
from django.core.files.uploadedfile import SimpleUploadedFile
from django.utils import formats
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext_lazy as _
from dbsettings.loading import get_setting_storage, set_setting_value
__all__ = ['Value', 'BooleanValue', 'DecimalValue', 'EmailValue',
'DurationValue', 'FloatValue', 'IntegerValue', 'PercentValue',
'PositiveIntegerValue', 'StringValue', 'TextValue', 'PasswordValue',
'MultiSeparatorValue', 'ImageValue',
'DateTimeValue', 'DateValue', 'TimeValue']
class Value(object):
creation_counter = 0
unitialized_value = None
def __init__(self, description=None, help_text=None, choices=None, required=True, default=None):
self.description = description
self.help_text = help_text
self.choices = choices or []
self.required = required
if default is None:
self.default = self.unitialized_value
else:
self.default = default
self.creation_counter = Value.creation_counter
Value.creation_counter += 1
def __lt__(self, other):
# This is needed because bisect does not take a comparison function.
return self.creation_counter < other.creation_counter
def copy(self):
new_value = self.__class__()
new_value.__dict__ = self.__dict__.copy()
return new_value
@property
def key(self):
return self.module_name, self.class_name, self.attribute_name
def contribute_to_class(self, cls, attribute_name):
self.module_name = cls.__module__
self.class_name = ''
self.attribute_name = attribute_name
self.description = self.description or attribute_name.replace('_', ' ')
setattr(cls, self.attribute_name, self)
@property
def app(self):
return getattr(self, '_app', self.module_name.split('.')[-2])
def __get__(self, instance=None, cls=None):
if instance is None:
raise AttributeError("%r is only accessible from %s instances." %
(self.attribute_name, cls.__name__))
try:
storage = get_setting_storage(*self.key)
return self.to_python(storage.value)
except:
return None
def __set__(self, instance, value):
current_value = self.__get__(instance)
if self.to_python(value) != current_value:
set_setting_value(*(self.key + (value,)))
# Subclasses should override the following methods where applicable
def to_python(self, value):
"Returns a native Python object suitable for immediate use"
return value
def get_db_prep_save(self, value):
"Returns a value suitable for storage into a CharField"
return six.text_type(value)
def to_editor(self, value):
"Returns a value suitable for display in a form widget"
return six.text_type(value)
###############
# VALUE TYPES #
###############
class BooleanValue(Value):
unitialized_value = False
class field(forms.BooleanField):
def __init__(self, *args, **kwargs):
kwargs['required'] = False
forms.BooleanField.__init__(self, *args, **kwargs)
def to_python(self, value):
if value in (True, 't', 'True'):
return True
return False
to_editor = to_python
class DecimalValue(Value):
field = forms.DecimalField
def to_python(self, value):
return Decimal(value)
# DurationValue has a lot of duplication and ugliness because of issue #2443
# Until DurationField is sorted out, this has to do some extra work
class DurationValue(Value):
class field(forms.CharField):
def clean(self, value):
try:
return datetime.timedelta(seconds=float(value))
except (ValueError, TypeError):
raise forms.ValidationError('This value must be a real number.')
except OverflowError:
raise forms.ValidationError('The maximum allowed value is %s' %
datetime.timedelta.max)
def to_python(self, value):
if isinstance(value, datetime.timedelta):
return value
try:
return datetime.timedelta(seconds=float(value))
except (ValueError, TypeError):
raise forms.ValidationError('This value must be a real number.')
except OverflowError:
raise forms.ValidationError('The maximum allowed value is %s' % datetime.timedelta.max)
def get_db_prep_save(self, value):
return six.text_type(value.days * 24 * 3600 + value.seconds
+ float(value.microseconds) / 1000000)
class FloatValue(Value):
field = forms.FloatField
def to_python(self, value):
return float(value)
class IntegerValue(Value):
field = forms.IntegerField
def to_python(self, value):
return int(value)
class PercentValue(Value):
class field(forms.DecimalField):
def __init__(self, *args, **kwargs):
forms.DecimalField.__init__(self, 100, 0, 5, 2, *args, **kwargs)
class widget(forms.TextInput):
def render(self, *args, **kwargs):
# Place a percent sign after a smaller text field
attrs = kwargs.pop('attrs', {})
attrs['size'] = attrs['max_length'] = 6
return mark_safe(forms.TextInput.render(self, attrs=attrs, *args, **kwargs) + ' %')
def to_python(self, value):
return Decimal(value) / 100
class PositiveIntegerValue(IntegerValue):
class field(forms.IntegerField):
def __init__(self, *args, **kwargs):
kwargs['min_value'] = 0
forms.IntegerField.__init__(self, *args, **kwargs)
class StringValue(Value):
unitialized_value = ''
field = forms.CharField
class TextValue(Value):
unitialized_value = ''
field = forms.CharField
def to_python(self, value):
return six.text_type(value)
class EmailValue(Value):
unitialized_value = ''
field = forms.EmailField
def to_python(self, value):
return six.text_type(value)
class PasswordValue(Value):
class field(forms.CharField):
widget = forms.PasswordInput
def __init__(self, **kwargs):
if not kwargs.get('help_text'):
kwargs['help_text'] = _(
'Leave empty in order to retain old password. Provide new value to change.')
forms.CharField.__init__(self, **kwargs)
def clean(self, value):
# Retain old password if not changed
if value == '':
value = self.initial
return forms.CharField.clean(self, value)
class MultiSeparatorValue(TextValue):
"""Provides a way to store list-like string settings.
e.g 'mail@test.com;*@blah.com' would be returned as
['mail@test.com', '*@blah.com']. What the method
uses to split on can be defined by passing in a
separator string (default is semi-colon as above).
"""
def __init__(self, description=None, help_text=None, separator=';', required=True,
default=None):
self.separator = separator
if default is not None:
# convert from list to string
default = separator.join(default)
super(MultiSeparatorValue, self).__init__(description=description,
help_text=help_text,
required=required,
default=default)
class field(forms.CharField):
class widget(forms.Textarea):
pass
def to_python(self, value):
if value:
value = six.text_type(value)
value = value.split(self.separator)
value = [x.strip() for x in value]
else:
value = []
return value
class ImageValue(Value):
def __init__(self, *args, **kwargs):
if 'upload_to' in kwargs:
self._upload_to = kwargs.pop('upload_to', '')
super(ImageValue, self).__init__(*args, **kwargs)
class field(forms.ImageField):
class widget(forms.FileInput):
"Widget with preview"
def render(self, name, value, attrs=None):
output = []
try:
if not value:
raise IOError('No value')
from PIL import Image
Image.open(value.file)
file_name = pjoin(settings.MEDIA_URL, value.name).replace("\\", "/")
params = {"file_name": file_name}
output.append('<p><img src="%(file_name)s" width="100" /></p>' % params)
except IOError:
pass
output.append(forms.FileInput.render(self, name, value, attrs))
return mark_safe(''.join(output))
def to_python(self, value):
"Returns a native Python object suitable for immediate use"
return six.text_type(value)
def get_db_prep_save(self, value):
"Returns a value suitable for storage into a CharField"
if not value:
return None
hashed_name = md5(six.text_type(time.time())).hexdigest() + value.name[-4:]
image_path = pjoin(self._upload_to, hashed_name)
dest_name = pjoin(settings.MEDIA_ROOT, image_path)
directory = pjoin(settings.MEDIA_ROOT, self._upload_to)
if not os.path.exists(directory):
os.makedirs(directory)
with open(dest_name, 'wb+') as dest_file:
for chunk in value.chunks():
dest_file.write(chunk)
return six.text_type(image_path)
def to_editor(self, value):
"Returns a value suitable for display in a form widget"
if not value:
return None
file_name = pjoin(settings.MEDIA_ROOT, value)
try:
with open(file_name, 'rb') as f:
uploaded_file = SimpleUploadedFile(value, f.read(), 'image')
# hack to retrieve path from `name` attribute
uploaded_file.__dict__['_name'] = value
return uploaded_file
except IOError:
return None
class DateTimeValue(Value):
field = forms.DateTimeField
formats_source = 'DATETIME_INPUT_FORMATS'
@property
def _formats(self):
return formats.get_format(self.formats_source)
def _parse_format(self, value):
for format in self._formats:
try:
return datetime.datetime.strptime(value, format)
except (ValueError, TypeError):
continue
return None
def get_db_prep_save(self, value):
if isinstance(value, six.string_types):
return value
return value.strftime(self._formats[0])
def to_python(self, value):
if isinstance(value, datetime.datetime):
return value
return self._parse_format(value)
class DateValue(DateTimeValue):
field = forms.DateField
formats_source = 'DATE_INPUT_FORMATS'
def to_python(self, value):
if isinstance(value, datetime.datetime):
return value.date()
elif isinstance(value, datetime.date):
return value
res = self._parse_format(value)
if res is not None:
return res.date()
return res
class TimeValue(DateTimeValue):
field = forms.TimeField
formats_source = 'TIME_INPUT_FORMATS'
def to_python(self, value):
if isinstance(value, datetime.datetime):
return value.time()
elif isinstance(value, datetime.time):
return value
res = self._parse_format(value)
if res is not None:
return res.time()
return res