Add package files

extend/admin.py

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+from django.contrib import admin
+from mptt.admin import MPTTModelAdmin
+
+
+class CategoryModelAdmin(MPTTModelAdmin):
+    list_display = ("id", "name", "slug")
+
+
+class TagModelAdmin(admin.ModelAdmin):
+    list_display = ("id", "name", "slug")
+
+
+def toggle_status_published(modeladmin, request, queryset):
+    queryset.update(status="published")
+
+
+def toggle_status_moderation(modeladmin, request, queryset):
+    queryset.update(status="moderation")
+
+
+toggle_status_published.short_description = "Опубликовать"
+toggle_status_moderation.short_description = "Отправить на модерацию"

extend/apps.py

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+from django.apps import AppConfig
+
+
+class ExtendConfig(AppConfig):
+    name = "extend"

extend/models.py

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+from datetime import datetime
+from django.db import models
+from django.contrib.auth.models import User
+from django.utils.safestring import mark_safe
+from mptt.models import MPTTModel, TreeForeignKey
+from pytils.translit import slugify
+from model_utils import Choices
+from easy_thumbnails.files import get_thumbnailer
+from easy_thumbnails.fields import ThumbnailerImageField
+
+
+class Category(MPTTModel):
+    name = models.CharField(
+        "Название", unique=True, max_length=100
+    )
+    slug = models.SlugField(
+        "Путь",
+        null=True,
+        blank=True,
+        unique=True,
+        max_length=100,
+    )
+    parent = TreeForeignKey(
+        "self",
+        on_delete=models.CASCADE,
+        null=True,
+        blank=True,
+        related_name="children",
+    )
+
+    class MPTTMeta:
+        order_insertion_by = ["name"]
+
+    class Meta:
+        abstract = True
+        verbose_name = "Категория"
+        verbose_name_plural = "Категории"
+        ordering = ["name"]
+
+    def __str__(self):
+        return self.name
+
+    def save(self, *args, **kwargs):
+        if not self.slug:
+            self.slug = slugify(self.name)
+        super().save(*args, **kwargs)
+
+
+class Tag(models.Model):
+    name = models.CharField(
+        "Название", unique=True, max_length=100
+    )
+    slug = models.SlugField(
+        "Путь",
+        null=True,
+        blank=True,
+        unique=True,
+        max_length=100,
+    )
+
+    class Meta:
+        abstract = True
+        verbose_name = "Метка"
+        verbose_name_plural = "Метки"
+        ordering = ["name"]
+
+    def __str__(self):
+        return self.name
+
+    def save(self, *args, **kwargs):
+        if not self.slug:
+            self.slug = slugify(self.name)
+        super().save(*args, **kwargs)
+
+
+class Photo(models.Model):
+    user = models.ForeignKey(User, null=True, on_delete=models.SET_NULL, verbose_name="Пользователь")
+    title = models.CharField("Название", blank=True, max_length=255)
+    image = ThumbnailerImageField(
+        "Фото", upload_to="photos/", max_length=255, default="", resize_source=dict(size=(825, 825), sharpen=True)
+    )
+    created = models.DateTimeField("Создано", default=datetime.now)
+    updated = models.DateTimeField("Изменено", auto_now=True)
+
+    class Meta:
+        abstract = True
+        verbose_name = "Фотография"
+        verbose_name_plural = "Фотографии"
+        ordering = ["id"]
+
+    def __str__(self):
+        return self.title
+
+    def image_tag(self):
+        if self.image:
+            options = {'size': (100, 100), 'upscale': True}
+            thumb_url = get_thumbnailer(self.image).get_thumbnail(options).url
+            return mark_safe('<img src="%s"/>' % thumb_url)
+        else:
+            return 'Изображение отсутствует'
+
+    image_tag.short_description = 'Превью'
+
+
+class Comment(models.Model):
+    user = models.ForeignKey(User, null=True, on_delete=models.CASCADE)
+    text = models.TextField("Текст")
+    created = models.DateTimeField(
+        "Создано", auto_now_add=True
+    )
+    updated = models.DateTimeField(
+        "Изменено", auto_now=True
+    )
+    STATUS = Choices(
+        ("moderation", "На модерации"),
+        ("published", "Опубликовано"),
+    )
+    status = models.CharField(
+        choices=STATUS,
+        default=STATUS.moderation,
+        max_length=20,
+    )
+
+    class Meta:
+        abstract = True
+        verbose_name = "Комментарий"
+        verbose_name_plural = "Комментарии"
+        ordering = ["-created"]
+
+    def __str__(self):
+        return f'{self.created} {self.user.username}'

extend/utils.py

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+import re
+from django.core.exceptions import ValidationError
+from django.utils.crypto import get_random_string
+from django.utils.translation import gettext_lazy as _
+
+
+def validate_url(value):
+    """
+    Валидация ссылок на видео с видеохостинга YouTube
+    """
+    video_url = value
+    regex = re.compile(
+        r"(https?://)?(www\.)?(youtube|youtu|youtube-nocookie)\.(com|be)/(watch\?v=|embed/|v/|.+\?v=)?(?P<id>[A-Za-z0-9\-=_]{11})"
+    )
+    match = regex.match(video_url)
+    if not match:
+        raise ValidationError(
+            _("%(value)s не является корректной YouTube ссылкой"),
+            params={"value": value},
+        )
+
+
+def generate_secret_key():
+    chars = "abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)"
+    return get_random_string(50, chars)