app/django/db/models/fields/files.py
author Sverre Rabbelier <srabbelier@gmail.com>
Tue, 08 Sep 2009 14:56:39 +0200
changeset 2882 3fbbb56b7925
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Add a view to start conversion tasks
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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import datetime
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import os
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from django.conf import settings
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from django.db.models.fields import Field
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from django.core.files.base import File, ContentFile
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from django.core.files.storage import default_storage
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from django.core.files.images import ImageFile, get_image_dimensions
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from django.core.files.uploadedfile import UploadedFile
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from django.utils.functional import curry
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from django.db.models import signals
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from django.utils.encoding import force_unicode, smart_str
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from django.utils.translation import ugettext_lazy, ugettext as _
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from django import forms
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from django.db.models.loading import cache
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class FieldFile(File):
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    def __init__(self, instance, field, name):
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        self.instance = instance
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        self.field = field
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        self.storage = field.storage
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        self._name = name or u''
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        self._closed = False
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    def __eq__(self, other):
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        # Older code may be expecting FileField values to be simple strings.
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        # By overriding the == operator, it can remain backwards compatibility.
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        if hasattr(other, 'name'):
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            return self.name == other.name
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        return self.name == other
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    # The standard File contains most of the necessary properties, but
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    # FieldFiles can be instantiated without a name, so that needs to
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    # be checked for here.
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    def _require_file(self):
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        if not self:
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            raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)
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    def _get_file(self):
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        self._require_file()
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        if not hasattr(self, '_file'):
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            self._file = self.storage.open(self.name, 'rb')
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        return self._file
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    file = property(_get_file)
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    def _get_path(self):
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        self._require_file()
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        return self.storage.path(self.name)
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    path = property(_get_path)
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    def _get_url(self):
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        self._require_file()
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        return self.storage.url(self.name)
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    url = property(_get_url)
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    def _get_size(self):
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        self._require_file()
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        return self.storage.size(self.name)
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    size = property(_get_size)
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    def open(self, mode='rb'):
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        self._require_file()
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        return super(FieldFile, self).open(mode)
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    # open() doesn't alter the file's contents, but it does reset the pointer
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    open.alters_data = True
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    # In addition to the standard File API, FieldFiles have extra methods
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    # to further manipulate the underlying file, as well as update the
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    # associated model instance.
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    def save(self, name, content, save=True):
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        name = self.field.generate_filename(self.instance, name)
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        self._name = self.storage.save(name, content)
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        setattr(self.instance, self.field.name, self.name)
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        # Update the filesize cache
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        self._size = len(content)
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        # Save the object because it has changed, unless save is False
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        if save:
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            self.instance.save()
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    save.alters_data = True
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    def delete(self, save=True):
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        # Only close the file if it's already open, which we know by the
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        # presence of self._file
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        if hasattr(self, '_file'):
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            self.close()
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            del self._file
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        self.storage.delete(self.name)
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        self._name = None
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        setattr(self.instance, self.field.name, self.name)
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        # Delete the filesize cache
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        if hasattr(self, '_size'):
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            del self._size
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        if save:
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            self.instance.save()
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    delete.alters_data = True
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    def __getstate__(self):
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        # FieldFile needs access to its associated model field and an instance
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        # it's attached to in order to work properly, but the only necessary
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        # data to be pickled is the file's name itself. Everything else will
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        # be restored later, by FileDescriptor below.
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        return {'_name': self.name, '_closed': False}
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class FileDescriptor(object):
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    def __init__(self, field):
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        self.field = field
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    def __get__(self, instance=None, owner=None):
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        if instance is None:
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            raise AttributeError, "%s can only be accessed from %s instances." % (self.field.name(self.owner.__name__))
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        file = instance.__dict__[self.field.name]
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        if not isinstance(file, FieldFile):
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            # Create a new instance of FieldFile, based on a given file name
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            instance.__dict__[self.field.name] = self.field.attr_class(instance, self.field, file)
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        elif not hasattr(file, 'field'):
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            # The FieldFile was pickled, so some attributes need to be reset.
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            file.instance = instance
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            file.field = self.field
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            file.storage = self.field.storage
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        return instance.__dict__[self.field.name]
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    def __set__(self, instance, value):
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        instance.__dict__[self.field.name] = value
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class FileField(Field):
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    attr_class = FieldFile
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    def __init__(self, verbose_name=None, name=None, upload_to='', storage=None, **kwargs):
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        for arg in ('primary_key', 'unique'):
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            if arg in kwargs:
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                raise TypeError("'%s' is not a valid argument for %s." % (arg, self.__class__))
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        self.storage = storage or default_storage
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        self.upload_to = upload_to
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        if callable(upload_to):
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            self.generate_filename = upload_to
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        kwargs['max_length'] = kwargs.get('max_length', 100)
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        super(FileField, self).__init__(verbose_name, name, **kwargs)
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    def get_internal_type(self):
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        return "FileField"
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    def get_db_prep_lookup(self, lookup_type, value):
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        if hasattr(value, 'name'):
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            value = value.name
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        return super(FileField, self).get_db_prep_lookup(lookup_type, value)
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    def get_db_prep_value(self, value):
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        "Returns field's value prepared for saving into a database."
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        # Need to convert File objects provided via a form to unicode for database insertion
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        if value is None:
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            return None
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        return unicode(value)
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    def contribute_to_class(self, cls, name):
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        super(FileField, self).contribute_to_class(cls, name)
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        setattr(cls, self.name, FileDescriptor(self))
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        signals.post_delete.connect(self.delete_file, sender=cls)
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    def delete_file(self, instance, sender, **kwargs):
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        file = getattr(instance, self.attname)
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        # If no other object of this type references the file,
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        # and it's not the default value for future objects,
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        # delete it from the backend.
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        if file and file.name != self.default and \
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            not sender._default_manager.filter(**{self.name: file.name}):
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                file.delete(save=False)
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        elif file:
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            # Otherwise, just close the file, so it doesn't tie up resources.
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            file.close()
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    def get_directory_name(self):
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        return os.path.normpath(force_unicode(datetime.datetime.now().strftime(smart_str(self.upload_to))))
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    def get_filename(self, filename):
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        return os.path.normpath(self.storage.get_valid_name(os.path.basename(filename)))
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    def generate_filename(self, instance, filename):
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        return os.path.join(self.get_directory_name(), self.get_filename(filename))
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    def save_form_data(self, instance, data):
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        if data and isinstance(data, UploadedFile):
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            getattr(instance, self.name).save(data.name, data, save=False)
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    def formfield(self, **kwargs):
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        defaults = {'form_class': forms.FileField}
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        # If a file has been provided previously, then the form doesn't require
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        # that a new file is provided this time.
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        # The code to mark the form field as not required is used by
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        # form_for_instance, but can probably be removed once form_for_instance
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        # is gone. ModelForm uses a different method to check for an existing file.
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        if 'initial' in kwargs:
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            defaults['required'] = False
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        defaults.update(kwargs)
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        return super(FileField, self).formfield(**defaults)
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class ImageFieldFile(ImageFile, FieldFile):
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    def save(self, name, content, save=True):
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        # Repopulate the image dimension cache.
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        self._dimensions_cache = get_image_dimensions(content)
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        # Update width/height fields, if needed
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        if self.field.width_field:
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            setattr(self.instance, self.field.width_field, self.width)
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        if self.field.height_field:
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            setattr(self.instance, self.field.height_field, self.height)
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        super(ImageFieldFile, self).save(name, content, save)
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    def delete(self, save=True):
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        # Clear the image dimensions cache
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        if hasattr(self, '_dimensions_cache'):
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            del self._dimensions_cache
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        super(ImageFieldFile, self).delete(save)
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class ImageField(FileField):
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    attr_class = ImageFieldFile
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    def __init__(self, verbose_name=None, name=None, width_field=None, height_field=None, **kwargs):
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        self.width_field, self.height_field = width_field, height_field
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        FileField.__init__(self, verbose_name, name, **kwargs)
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    def formfield(self, **kwargs):
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        defaults = {'form_class': forms.ImageField}
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        defaults.update(kwargs)
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        return super(ImageField, self).formfield(**defaults)