from django.conf import settings from django.db import models from django.utils.translation import ugettext as _ from ..core.config import config from ..core.models import Projector from ..utils.autoupdate import inform_changed_data from ..utils.models import RESTModelMixin from .access_permissions import MediafileAccessPermissions class Mediafile(RESTModelMixin, models.Model): """ Class for uploaded files which can be delivered under a certain url. """ access_permissions = MediafileAccessPermissions() can_see_permission = 'mediafiles.can_see' mediafile = models.FileField(upload_to='file') """ See https://docs.djangoproject.com/en/dev/ref/models/fields/#filefield for more information. """ title = models.CharField(max_length=255, unique=True) """A string representing the title of the file.""" uploader = models.ForeignKey( settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True) """A user – the uploader of a file.""" hidden = models.BooleanField(default=False) """Whether or not this mediafile should be marked as hidden""" timestamp = models.DateTimeField(auto_now_add=True) """A DateTimeField to save the upload date and time.""" class Meta: """ Meta class for the mediafile model. """ ordering = ['title'] default_permissions = () permissions = ( ('can_see', 'Can see the list of files'), ('can_see_hidden', 'Can see hidden files'), ('can_upload', 'Can upload files'), ('can_manage', 'Can manage files')) def __str__(self): """ Method for representation. """ return self.title def save(self, *args, **kwargs): """ Saves mediafile (mainly on create and update requests). """ result = super().save(*args, **kwargs) # Send uploader via autoupdate because users without permission # to see users may not have it but can get it now. inform_changed_data(self.uploader) return result def delete(self, skip_autoupdate=False, *args, **kwargs): """ Customized method to delete a mediafile. Ensures that a respective mediafile projector element is disabled. """ Projector.remove_any( skip_autoupdate=skip_autoupdate, name='mediafiles/mediafile', id=self.pk) return super().delete(skip_autoupdate=skip_autoupdate, *args, **kwargs) # type: ignore def get_filesize(self): """ Transforms bytes to kilobytes or megabytes. Returns the size as string. """ # TODO: Read http://stackoverflow.com/a/1094933 and think about it. try: size = self.mediafile.size except OSError: size_string = _('unknown') else: if size < 1024: size_string = '< 1 kB' elif size >= 1024 * 1024: mB = size / 1024 / 1024 size_string = '%d MB' % mB else: kB = size / 1024 size_string = '%d kB' % kB return size_string def is_logo(self): for key in config['logos_available']: if config[key]['path'] == self.mediafile.url: return True return False def is_font(self): for key in config['fonts_available']: if config[key]['path'] == self.mediafile.url: return True return False