Sith/sas/models.py

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# -*- coding:utf-8 -*
#
# Copyright 2016,2017
# - Skia <skia@libskia.so>
#
# Ce fichier fait partie du site de l'Association des Étudiants de l'UTBM,
# http://ae.utbm.fr.
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License a published by the Free Software
# Foundation; either version 3 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Sofware Foundation, Inc., 59 Temple
# Place - Suite 330, Boston, MA 02111-1307, USA.
#
#
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from django.db import models
from django.urls import reverse
from django.core.cache import cache
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from django.conf import settings
from django.utils.translation import gettext_lazy as _
from django.utils import timezone
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from PIL import Image
from io import BytesIO
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import os
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from core.models import SithFile, User
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from core.utils import resize_image, exif_auto_rotate
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class SASPictureManager(models.Manager):
def get_queryset(self):
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return (
super(SASPictureManager, self)
.get_queryset()
.filter(is_in_sas=True, is_folder=False)
)
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class SASAlbumManager(models.Manager):
def get_queryset(self):
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return (
super(SASAlbumManager, self)
.get_queryset()
.filter(is_in_sas=True, is_folder=True)
)
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class Picture(SithFile):
class Meta:
proxy = True
objects = SASPictureManager()
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@property
def is_vertical(self):
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with open(
os.path.join(settings.MEDIA_ROOT, self.file.name).encode("utf-8"), "rb"
) as f:
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im = Image.open(BytesIO(f.read()))
(w, h) = im.size
return (w / h) < 1
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def can_be_edited_by(self, user):
return user.is_in_group(settings.SITH_GROUP_SAS_ADMIN_ID)
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def can_be_viewed_by(self, user):
# SAS pictures are visible to old subscribers
# Result is cached 4s for this user
if user.is_anonymous:
return False
perm = cache.get("%d_can_view_pictures" % (user.id), False)
# use cache only when user is in SAS Admins or when picture is moderated
if perm and (self.is_moderated or self.can_be_edited_by(user)):
return perm
perm = (
self.is_in_sas
and (self.is_moderated or self.can_be_edited_by(user))
and user.was_subscribed
)
cache.set("%d_can_view_pictures" % (user.id), perm, timeout=4)
return perm
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def get_download_url(self):
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return reverse("sas:download", kwargs={"picture_id": self.id})
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def get_download_compressed_url(self):
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return reverse("sas:download_compressed", kwargs={"picture_id": self.id})
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def get_download_thumb_url(self):
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return reverse("sas:download_thumb", kwargs={"picture_id": self.id})
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def get_absolute_url(self):
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return reverse("sas:picture", kwargs={"picture_id": self.id})
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def generate_thumbnails(self, overwrite=False):
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im = Image.open(BytesIO(self.file.read()))
try:
im = exif_auto_rotate(im)
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except:
pass
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file = resize_image(im, max(im.size), self.mime_type.split("/")[-1])
thumb = resize_image(im, 200, self.mime_type.split("/")[-1])
compressed = resize_image(im, 1200, self.mime_type.split("/")[-1])
if overwrite:
self.file.delete()
self.thumbnail.delete()
self.compressed.delete()
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self.file = file
self.file.name = self.name
self.thumbnail = thumb
self.thumbnail.name = self.name
self.compressed = compressed
self.compressed.name = self.name
self.save()
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def rotate(self, degree):
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for attr in ["file", "compressed", "thumbnail"]:
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name = self.__getattribute__(attr).name
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with open(
os.path.join(settings.MEDIA_ROOT, name).encode("utf-8"), "r+b"
) as file:
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if file:
im = Image.open(BytesIO(file.read()))
file.seek(0)
im = im.rotate(degree, expand=True)
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im.save(
fp=file,
format=self.mime_type.split("/")[-1].upper(),
quality=90,
optimize=True,
progressive=True,
)
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def get_next(self):
if self.is_moderated:
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return (
self.parent.children.filter(
is_moderated=True,
asked_for_removal=False,
is_folder=False,
id__gt=self.id,
)
.order_by("id")
.first()
)
else:
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return (
Picture.objects.filter(id__gt=self.id, is_moderated=False)
.order_by("id")
.first()
)
def get_previous(self):
if self.is_moderated:
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return (
self.parent.children.filter(
is_moderated=True,
asked_for_removal=False,
is_folder=False,
id__lt=self.id,
)
.order_by("id")
.last()
)
else:
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return (
Picture.objects.filter(id__lt=self.id, is_moderated=False)
.order_by("-id")
.first()
)
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class Album(SithFile):
class Meta:
proxy = True
objects = SASAlbumManager()
@property
def children_pictures(self):
return Picture.objects.filter(parent=self)
@property
def children_albums(self):
return Album.objects.filter(parent=self)
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def can_be_edited_by(self, user):
# file = SithFile.objects.filter(id=self.id).first()
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return user.is_in_group(
settings.SITH_GROUP_SAS_ADMIN_ID
) # or user.can_edit(file)
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def can_be_viewed_by(self, user):
# file = SithFile.objects.filter(id=self.id).first()
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return self.can_be_edited_by(user) or (
self.is_in_sas and self.is_moderated and user.was_subscribed
) # or user.can_view(file)
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def get_absolute_url(self):
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return reverse("sas:album", kwargs={"album_id": self.id})
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def get_download_url(self):
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return reverse("sas:album_preview", kwargs={"album_id": self.id})
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def generate_thumbnail(self):
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p = (
self.children_pictures.order_by("?").first()
or self.children_albums.exclude(file=None)
.exclude(file="")
.order_by("?")
.first()
)
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if p and p.file:
im = Image.open(BytesIO(p.file.read()))
self.file = resize_image(im, 200, "jpeg")
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self.file.name = self.name + "/thumb.jpg"
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self.save()
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def sas_notification_callback(notif):
count = Picture.objects.filter(is_moderated=False).count()
if count:
notif.viewed = False
else:
notif.viewed = True
notif.param = "%s" % count
notif.date = timezone.now()
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class PeoplePictureRelation(models.Model):
"""
The PeoplePictureRelation class makes the connection between User and Picture
"""
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user = models.ForeignKey(
User,
verbose_name=_("user"),
related_name="pictures",
null=False,
blank=False,
on_delete=models.CASCADE,
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)
picture = models.ForeignKey(
Picture,
verbose_name=_("picture"),
related_name="people",
null=False,
blank=False,
on_delete=models.CASCADE,
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)
class Meta:
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unique_together = ["user", "picture"]
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def __str__(self):
return self.user.get_display_name() + " - " + str(self.picture)