266 lines
10 KiB
Python
266 lines
10 KiB
Python
import copy
|
|
import datetime
|
|
import os
|
|
|
|
from django.conf import settings
|
|
from django.db.models.fields import Field
|
|
from django.core.files.base import File, ContentFile
|
|
from django.core.files.storage import default_storage
|
|
from django.core.files.images import ImageFile, get_image_dimensions
|
|
from django.core.files.uploadedfile import UploadedFile
|
|
from django.utils.functional import curry
|
|
from django.db.models import signals
|
|
from django.utils.encoding import force_unicode, smart_str
|
|
from django.utils.translation import ugettext_lazy, ugettext as _
|
|
from django import forms
|
|
from django.db.models.loading import cache
|
|
|
|
class FieldFile(File):
|
|
def __init__(self, instance, field, name):
|
|
self.instance = instance
|
|
self.field = field
|
|
self.storage = field.storage
|
|
self._name = name or u''
|
|
self._closed = False
|
|
self._committed = True
|
|
|
|
def __eq__(self, other):
|
|
# Older code may be expecting FileField values to be simple strings.
|
|
# By overriding the == operator, it can remain backwards compatibility.
|
|
if hasattr(other, 'name'):
|
|
return self.name == other.name
|
|
return self.name == other
|
|
|
|
def __ne__(self, other):
|
|
return not self.__eq__(other)
|
|
|
|
def __hash__(self):
|
|
# Required because we defined a custom __eq__.
|
|
return hash(self.name)
|
|
|
|
# The standard File contains most of the necessary properties, but
|
|
# FieldFiles can be instantiated without a name, so that needs to
|
|
# be checked for here.
|
|
|
|
def _require_file(self):
|
|
if not self:
|
|
raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)
|
|
|
|
def _get_file(self):
|
|
self._require_file()
|
|
if not hasattr(self, '_file'):
|
|
self._file = self.storage.open(self.name, 'rb')
|
|
return self._file
|
|
file = property(_get_file)
|
|
|
|
def _get_path(self):
|
|
self._require_file()
|
|
return self.storage.path(self.name)
|
|
path = property(_get_path)
|
|
|
|
def _get_url(self):
|
|
self._require_file()
|
|
return self.storage.url(self.name)
|
|
url = property(_get_url)
|
|
|
|
def _get_size(self):
|
|
self._require_file()
|
|
return self.storage.size(self.name)
|
|
size = property(_get_size)
|
|
|
|
def open(self, mode='rb'):
|
|
self._require_file()
|
|
return super(FieldFile, self).open(mode)
|
|
# open() doesn't alter the file's contents, but it does reset the pointer
|
|
open.alters_data = True
|
|
|
|
# In addition to the standard File API, FieldFiles have extra methods
|
|
# to further manipulate the underlying file, as well as update the
|
|
# associated model instance.
|
|
|
|
def save(self, name, content, save=True):
|
|
name = self.field.generate_filename(self.instance, name)
|
|
self._name = self.storage.save(name, content)
|
|
setattr(self.instance, self.field.name, self.name)
|
|
|
|
# Update the filesize cache
|
|
self._size = len(content)
|
|
self._committed = True
|
|
|
|
# Save the object because it has changed, unless save is False
|
|
if save:
|
|
self.instance.save()
|
|
save.alters_data = True
|
|
|
|
def delete(self, save=True):
|
|
# Only close the file if it's already open, which we know by the
|
|
# presence of self._file
|
|
if hasattr(self, '_file'):
|
|
self.close()
|
|
del self._file
|
|
|
|
self.storage.delete(self.name)
|
|
|
|
self._name = None
|
|
setattr(self.instance, self.field.name, self.name)
|
|
|
|
# Delete the filesize cache
|
|
if hasattr(self, '_size'):
|
|
del self._size
|
|
self._committed = False
|
|
|
|
if save:
|
|
self.instance.save()
|
|
delete.alters_data = True
|
|
|
|
def __getstate__(self):
|
|
# FieldFile needs access to its associated model field and an instance
|
|
# it's attached to in order to work properly, but the only necessary
|
|
# data to be pickled is the file's name itself. Everything else will
|
|
# be restored later, by FileDescriptor below.
|
|
return {'_name': self.name, '_closed': False, '_committed': True}
|
|
|
|
class FileDescriptor(object):
|
|
def __init__(self, field):
|
|
self.field = field
|
|
|
|
def __get__(self, instance=None, owner=None):
|
|
if instance is None:
|
|
raise AttributeError("The '%s' attribute can only be accessed from %s instances." % (self.field.name, owner.__name__))
|
|
file = instance.__dict__[self.field.name]
|
|
if isinstance(file, basestring) or file is None:
|
|
# Create a new instance of FieldFile, based on a given file name
|
|
instance.__dict__[self.field.name] = self.field.attr_class(instance, self.field, file)
|
|
elif isinstance(file, File) and not isinstance(file, FieldFile):
|
|
# Other types of files may be assigned as well, but they need to
|
|
# have the FieldFile interface added to them
|
|
file_copy = copy.copy(file)
|
|
file_copy.__class__ = type(file.__class__.__name__,
|
|
(file.__class__, self.field.attr_class), {})
|
|
file_copy.instance = instance
|
|
file_copy.field = self.field
|
|
file_copy.storage = self.field.storage
|
|
file_copy._committed = False
|
|
instance.__dict__[self.field.name] = file_copy
|
|
elif isinstance(file, FieldFile) and not hasattr(file, 'field'):
|
|
# The FieldFile was pickled, so some attributes need to be reset.
|
|
file.instance = instance
|
|
file.field = self.field
|
|
file.storage = self.field.storage
|
|
return instance.__dict__[self.field.name]
|
|
|
|
def __set__(self, instance, value):
|
|
instance.__dict__[self.field.name] = value
|
|
|
|
class FileField(Field):
|
|
attr_class = FieldFile
|
|
|
|
def __init__(self, verbose_name=None, name=None, upload_to='', storage=None, **kwargs):
|
|
for arg in ('primary_key', 'unique'):
|
|
if arg in kwargs:
|
|
raise TypeError("'%s' is not a valid argument for %s." % (arg, self.__class__))
|
|
|
|
self.storage = storage or default_storage
|
|
self.upload_to = upload_to
|
|
if callable(upload_to):
|
|
self.generate_filename = upload_to
|
|
|
|
kwargs['max_length'] = kwargs.get('max_length', 100)
|
|
super(FileField, self).__init__(verbose_name, name, **kwargs)
|
|
|
|
def get_internal_type(self):
|
|
return "FileField"
|
|
|
|
def get_db_prep_lookup(self, lookup_type, value):
|
|
if hasattr(value, 'name'):
|
|
value = value.name
|
|
return super(FileField, self).get_db_prep_lookup(lookup_type, value)
|
|
|
|
def get_db_prep_value(self, value):
|
|
"Returns field's value prepared for saving into a database."
|
|
# Need to convert File objects provided via a form to unicode for database insertion
|
|
if value is None:
|
|
return None
|
|
return unicode(value)
|
|
|
|
def pre_save(self, model_instance, add):
|
|
"Returns field's value just before saving."
|
|
file = super(FileField, self).pre_save(model_instance, add)
|
|
if file and not file._committed:
|
|
# Commit the file to storage prior to saving the model
|
|
file.save(file.name, file, save=False)
|
|
return file
|
|
|
|
def contribute_to_class(self, cls, name):
|
|
super(FileField, self).contribute_to_class(cls, name)
|
|
setattr(cls, self.name, FileDescriptor(self))
|
|
signals.post_delete.connect(self.delete_file, sender=cls)
|
|
|
|
def delete_file(self, instance, sender, **kwargs):
|
|
file = getattr(instance, self.attname)
|
|
# If no other object of this type references the file,
|
|
# and it's not the default value for future objects,
|
|
# delete it from the backend.
|
|
if file and file.name != self.default and \
|
|
not sender._default_manager.filter(**{self.name: file.name}):
|
|
file.delete(save=False)
|
|
elif file:
|
|
# Otherwise, just close the file, so it doesn't tie up resources.
|
|
file.close()
|
|
|
|
def get_directory_name(self):
|
|
return os.path.normpath(force_unicode(datetime.datetime.now().strftime(smart_str(self.upload_to))))
|
|
|
|
def get_filename(self, filename):
|
|
return os.path.normpath(self.storage.get_valid_name(os.path.basename(filename)))
|
|
|
|
def generate_filename(self, instance, filename):
|
|
return os.path.join(self.get_directory_name(), self.get_filename(filename))
|
|
|
|
def save_form_data(self, instance, data):
|
|
if data:
|
|
setattr(instance, self.name, data)
|
|
|
|
def formfield(self, **kwargs):
|
|
defaults = {'form_class': forms.FileField}
|
|
# If a file has been provided previously, then the form doesn't require
|
|
# that a new file is provided this time.
|
|
# The code to mark the form field as not required is used by
|
|
# form_for_instance, but can probably be removed once form_for_instance
|
|
# is gone. ModelForm uses a different method to check for an existing file.
|
|
if 'initial' in kwargs:
|
|
defaults['required'] = False
|
|
defaults.update(kwargs)
|
|
return super(FileField, self).formfield(**defaults)
|
|
|
|
class ImageFieldFile(ImageFile, FieldFile):
|
|
def save(self, name, content, save=True):
|
|
# Repopulate the image dimension cache.
|
|
self._dimensions_cache = get_image_dimensions(content)
|
|
|
|
# Update width/height fields, if needed
|
|
if self.field.width_field:
|
|
setattr(self.instance, self.field.width_field, self.width)
|
|
if self.field.height_field:
|
|
setattr(self.instance, self.field.height_field, self.height)
|
|
|
|
super(ImageFieldFile, self).save(name, content, save)
|
|
|
|
def delete(self, save=True):
|
|
# Clear the image dimensions cache
|
|
if hasattr(self, '_dimensions_cache'):
|
|
del self._dimensions_cache
|
|
super(ImageFieldFile, self).delete(save)
|
|
|
|
class ImageField(FileField):
|
|
attr_class = ImageFieldFile
|
|
|
|
def __init__(self, verbose_name=None, name=None, width_field=None, height_field=None, **kwargs):
|
|
self.width_field, self.height_field = width_field, height_field
|
|
FileField.__init__(self, verbose_name, name, **kwargs)
|
|
|
|
def formfield(self, **kwargs):
|
|
defaults = {'form_class': forms.ImageField}
|
|
defaults.update(kwargs)
|
|
return super(ImageField, self).formfield(**defaults)
|