initial

12 months ago · 39cd44d022
54 changed files with 2144 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,11 @@
+venv
+.venv
+.env
+*.sqlite3
+media
+*__pycache__
+.idea
+*.code-workspace
+.report.json
+report.json
+.vscode
--- a/40
+++ b/40
@ -0,0 +1,40 @@
+.DEFAULT_GOAL = default
+SCRIPT = contrib/scripts/make_scripts.sh
+
+## @ env
+.PHONY: env
+env: ## creates a .env file
+	@./${SCRIPT} make_env_file
+
+## @ task
+.PHONY: check run shell_plus clear_migrations show_migrations migrations migrate elements
+check: ## same as  manage.py check
+	@./${SCRIPT} check
+
+run: ## same as  manage.py run server
+	@./${SCRIPT} run
+
+shell_plus: ## same as .manage.py shell_plus
+	@./${SCRIPT} shell_plus
+
+clear_migrations: ## same as  manage.py showmigrations
+	@./${SCRIPT} clear_migrations
+
+show_migrations: ## same as  manage.py showmigrations
+	@./${SCRIPT} show_migrations
+
+migrations: ## same as  manage.py makemigrations
+	@./${SCRIPT} migrations
+
+migrate: ## same as  manage.py migrate
+	@./${SCRIPT} migrate
+
+elements: ## create initial app elements
+	@./${SCRIPT} elements
+
+## @ help
+.PHONY: help
+help: ## display all make commands
+	@./${SCRIPT} help $(MAKEFILE_LIST)
+
+default: help
--- a/README.md
+++ b/README.md
@ -0,0 +1,53 @@
+# Django Conc
+
+É um exemplo de aplicação Django para testar concorrência no momento de atualizar um modelo.
+Fortemente inspirado em [django-optimistic-lock](https://github.com/gavinwahl/django-optimistic-lock).
+
+
+## Instalação
+
+via `pip`
+
+```bash
+git clone https://git.lucasf.dev/public/django_conc.git
+cd django_conc
+python -m venv .venv
+. ./.venv/bin/activate
+pip install -r requirements.txt
+```
+
+
+via `poetry` 
+
+```bash
+git clone https://git.lucasf.dev/public/django_conc.git
+cd django_conc
+poetry shell
+poetry install
+```
+
+
+## Criando arquivo .env
+
+```bash
+make env
+```
+
+## Criando elementos para aplicação
+
+primeiro informe no arquivo `.env` gerado os valores para as seguintes variáveis:
+
+ADMIN_USERNAME
+ADMIN_EMAIL
+ADMIN_PASSWORD
+
+```bash
+make elements
+```
+
+## Iniciar a aplicação
+
+```bash
+make run
+```
+
--- a/contrib/scripts/make_scripts.sh
+++ b/contrib/scripts/make_scripts.sh
@ -0,0 +1,120 @@
+#!/usr/bin/env bash
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+BASEDIR="$(cd "$(dirname "$1")" && pwd)"
+CHARS="abcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*(-_=+)"
+for ((i=0;i<${#CHARS};i++)); do ARRAY[$i]="${CHARS:i:1}"; done
+MSG_SUCCESS="DONE!"
+POETRY=0
+PYTHON=0
+
+key_gen() {
+    for ((c=1; c<=50; c++)); do
+        KEY="$KEY${ARRAY[$((RANDOM % 50))]}"
+    done
+    echo $KEY
+}
+
+make_env_file() {
+    if [[ ! -f ".env" ]]; then
+        ENV="SECRET_KEY='$(key_gen)'\n
+        ALLOWED_HOSTS=localhost, 10.0.2.2, 127.0.0.1\n
+        DEBUG=True\n\n
+        #DATABASE_URL=postgres://postgres:postgres@127.0.0.1:5433/db\n\n
+        ADMIN_USERNAME=\n
+        ADMIN_EMAIL=\n
+        ADMIN_PASSWORD=\n\n
+        EMAIL_HOST=\n
+        EMAIL_PORT=\n
+        EMAIL_HOST_USER=\n
+        EMAIL_HOST_PASSWORD=\n
+        EMAIL_USE_TLS=True\n
+        DEFAULT_FROM_EMAIL=
+        "
+
+        $(echo -e $ENV | sed -e 's/^[ \t]*//' > .env)
+        echo "ENV FILE - $MSG_SUCCESS"
+    fi
+}
+
+verify_poetry() {
+    if command -v poetry &> /dev/null; then
+        POETRY=1
+    fi
+}
+
+verify_python() {
+    if command -v python3 &> /dev/null; then
+        PYTHON=1
+    fi
+}
+
+venv_name() {
+    if [[ -d "$BASEDIR/.venv" ]]; then
+        echo ".venv"
+    fi
+    if [[ -d "$BASEDIR/venv" ]]; then
+        echo "venv"
+    fi
+}
+
+python_name() {
+    if [[ PYTHON -eq 1 ]]; then
+        echo "python3"
+    else
+        echo "python"
+    fi
+}
+
+help() {
+    awk 'BEGIN {FS="## @ "; print "Usage: make";} /^## @ / { printf "\033[31m\n" substr($1, 5) "\n";} {FS=" ## ";} /^[a-zA-Z_-]+:.*? ##/ { print "\033[33m  -", $1 "\033[37m", $2}' $ARG
+}
+
+run() {
+    $(venv_name)/bin/$(python_name) manage.py runserver 0.0.0.0:8000
+}
+
+shell_plus() {
+    $(venv_name)/bin/$(python_name) manage.py shell_plus
+}
+
+check() {
+    $(venv_name)/bin/$(python_name) manage.py check
+    IS_OK=$?
+}
+
+show_migrations() {
+    $(venv_name)/bin/$(python_name) manage.py showmigrations
+}
+
+migrations() {
+    $(venv_name)/bin/$(python_name) manage.py makemigrations
+}
+
+migrate() {
+    $(venv_name)/bin/$(python_name) manage.py migrate
+}
+
+check() {
+    $(venv_name)/bin/$(python_name) manage.py check
+}
+
+elements() {
+    $(venv_name)/bin/$(python_name) manage.py elements
+}
+
+clear_migrations() {
+    find $BASEDIR -path '*/migrations/*.py' -not -name '__init__.py' -not -path '*/.venv/*' -delete
+    find $BASEDIR -path '*/migrations/*.pyc' -not -name '__init__.py' -not -path '*/.venv/*' -delete
+    if [[ -f $BASEDIR/media/ ]]; then
+        rm $BASEDIR/media/*
+    fi
+    if [[ -f db.sqlite3 ]];then
+        rm db.sqlite3
+    fi
+}
+
+verify_python
+verify_poetry
+ARG=$2
+$1
--- a/django_conc/init.py
+++ b/django_conc/init.py
--- a/django_conc/apps/init.py
+++ b/django_conc/apps/init.py
--- a/django_conc/apps/accounts/init.py
+++ b/django_conc/apps/accounts/init.py
--- a/django_conc/apps/accounts/admin.py
+++ b/django_conc/apps/accounts/admin.py
@ -0,0 +1,64 @@
+from django.contrib import admin
+from django.contrib.auth.admin import UserAdmin
+from django.utils.decorators import method_decorator
+from django.utils.translation import gettext_lazy as _
+from django.views.decorators.csrf import csrf_protect
+
+from .models import User
+
+csrf_protect_m = method_decorator(csrf_protect)
+
+
+class BaseUserAdmin(UserAdmin):
+    fieldsets = (
+        (None, {"fields": ("username", "password")}),
+        (
+            _("Personal info"),
+            {
+                "fields": (
+                    "first_name",
+                    "last_name",
+                    "email",
+                    "avatar",
+                    "use_dark_theme",
+                    "version",
+                )
+            },
+        ),
+        (
+            _("Permissions"),
+            {
+                "fields": (
+                    "is_active",
+                    "is_staff",
+                    "is_superuser",
+                ),
+            },
+        ),
+        (_("Important dates"), {"fields": ("last_login", "date_joined")}),
+    )
+    add_fieldsets = (
+        (
+            None,
+            {
+                "classes": ("wide",),
+                "fields": ("username", "password1", "password2"),
+            },
+        ),
+    )
+    list_display = (
+        "username",
+        "email",
+        "first_name",
+        "last_name",
+        "is_staff",
+    )
+    list_filter = (
+        "is_staff",
+        "is_superuser",
+        "is_active",
+    )
+    search_fields = ("username", "first_name", "last_name", "email")
+
+
+admin.site.register(User, BaseUserAdmin)
--- a/django_conc/apps/accounts/apps.py
+++ b/django_conc/apps/accounts/apps.py
@ -0,0 +1,7 @@
+from django.apps import AppConfig
+
+
+class AccountsConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "accounts"
+    default = False
--- a/django_conc/apps/accounts/backends.py
+++ b/django_conc/apps/accounts/backends.py
@ -0,0 +1,13 @@
+from django.contrib.auth import get_user_model
+from django.contrib.auth.backends import ModelBackend as BaseModelBackend
+
+
+class ModelBackend(BaseModelBackend):
+    def authenticate(self, request, username=None, password=None):
+        if not username is None:
+            try:
+                user = get_user_model().objects.get(email=username)
+                if user.check_password(password):
+                    return user
+            except get_user_model().DoesNotExist:
+                pass
--- a/django_conc/apps/accounts/forms.py
+++ b/django_conc/apps/accounts/forms.py
@ -0,0 +1,30 @@
+from django import forms
+from django.contrib.auth.forms import UserCreationForm
+from django.utils.translation import gettext_lazy as _
+
+from .models import User
+
+
+class UserAdminForm(forms.ModelForm):
+    class Meta:
+        model = User
+        fields = UserCreationForm.Meta.fields + (
+            "username",
+            "email",
+            "first_name",
+            "is_active",
+            "is_staff",
+        )
+
+
+class ListUserForm(forms.ModelForm):
+    class Meta:
+        model = User
+        fields = ["username", "email", "is_active", "avatar", "version"]
+        actions = True
+
+
+class NewUserForm(forms.ModelForm):
+    class Meta:
+        model = User
+        fields = ["username", "email", "is_active", "avatar", "version"]
--- a/django_conc/apps/accounts/managers.py
+++ b/django_conc/apps/accounts/managers.py
@ -0,0 +1,6 @@
+from django.contrib.auth.models import UserManager
+
+
+class CustomUserManager(UserManager):
+    def all(self):
+        return self.get_queryset().filter(is_superuser=False)
--- a/django_conc/apps/accounts/migrations/0001_initial.py
+++ b/django_conc/apps/accounts/migrations/0001_initial.py
@ -0,0 +1,51 @@
+# Generated by Django 5.0.2 on 2024-02-11 14:18
+
+import django.contrib.auth.validators
+import django.utils.timezone
+import django_conc.apps.accounts.managers
+import django_conc.apps.core.helpers
+import django_conc.apps.core.models
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('auth', '0012_alter_user_first_name_max_length'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='User',
+            fields=[
+                ('password', models.CharField(max_length=128, verbose_name='password')),
+                ('last_login', models.DateTimeField(blank=True, null=True, verbose_name='last login')),
+                ('is_superuser', models.BooleanField(default=False, help_text='Designates that this user has all permissions without explicitly assigning them.', verbose_name='superuser status')),
+                ('username', models.CharField(error_messages={'unique': 'A user with that username already exists.'}, help_text='Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.', max_length=150, unique=True, validators=[django.contrib.auth.validators.UnicodeUsernameValidator()], verbose_name='username')),
+                ('first_name', models.CharField(blank=True, max_length=150, verbose_name='first name')),
+                ('last_name', models.CharField(blank=True, max_length=150, verbose_name='last name')),
+                ('email', models.EmailField(blank=True, max_length=254, verbose_name='email address')),
+                ('version', django_conc.apps.core.models.VersionField(default=0, verbose_name='Version')),
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False, verbose_name='Identifier')),
+                ('avatar', models.ImageField(blank=True, null=True, upload_to=django_conc.apps.core.helpers.UploadToPathAndRename('user_avatar'), verbose_name='Photo')),
+                ('is_staff', models.BooleanField(default=False, verbose_name='staff status')),
+                ('is_active', models.BooleanField(default=False, verbose_name='active')),
+                ('is_admin', models.BooleanField(default=False, verbose_name='is admin')),
+                ('use_dark_theme', models.BooleanField(default=False, verbose_name='Uses dark theme')),
+                ('date_joined', models.DateTimeField(default=django.utils.timezone.now, verbose_name='date joined')),
+                ('groups', models.ManyToManyField(blank=True, help_text='The groups this user belongs to. A user will get all permissions granted to each of their groups.', related_name='user_set', related_query_name='user', to='auth.group', verbose_name='groups')),
+                ('user_permissions', models.ManyToManyField(blank=True, help_text='Specific permissions for this user.', related_name='user_set', related_query_name='user', to='auth.permission', verbose_name='user permissions')),
+            ],
+            options={
+                'verbose_name': 'User',
+                'verbose_name_plural': 'Users',
+                'ordering': ['username', 'first_name'],
+            },
+            managers=[
+                ('objects', django_conc.apps.accounts.managers.CustomUserManager()),
+            ],
+        ),
+    ]
--- a/django_conc/apps/accounts/migrations/init.py
+++ b/django_conc/apps/accounts/migrations/init.py
--- a/django_conc/apps/accounts/models.py
+++ b/django_conc/apps/accounts/models.py
@ -0,0 +1,41 @@
+import uuid
+
+from django.contrib.auth.models import AbstractUser
+from django.db import models
+from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
+
+from ..core.helpers import UploadToPathAndRename
+from ..core.models import VersionedModel
+from . import managers
+
+
+class User(VersionedModel, AbstractUser):
+    id = models.UUIDField(
+        _("Identifier"), primary_key=True, default=uuid.uuid4, editable=False
+    )
+    avatar = models.ImageField(
+        _("Photo"),
+        upload_to=UploadToPathAndRename("user_avatar"),
+        null=True,
+        blank=True,
+    )
+    is_staff = models.BooleanField(_("staff status"), default=False)
+    is_active = models.BooleanField(_("active"), default=False)
+    is_admin = models.BooleanField(_("is admin"), default=False)
+    use_dark_theme = models.BooleanField(_("Uses dark theme"), default=False)
+    date_joined = models.DateTimeField(_("date joined"), default=timezone.now)
+
+    EMAIL_FIELD = "email"
+    USERNAME_FIELD = "username"
+    REQUIRED_FIELDS = ["email"]
+
+    objects = managers.CustomUserManager()
+
+    class Meta:
+        verbose_name = _("User")
+        verbose_name_plural = _("Users")
+        ordering = ["username", "first_name"]
+
+    def __str__(self):
+        return self.first_name or self.username
--- a/django_conc/apps/accounts/templates/accounts/form.html
+++ b/django_conc/apps/accounts/templates/accounts/form.html
@ -0,0 +1,3 @@
+{% extends "core/pages/form.html" %}
+
+{% load static %}
--- a/django_conc/apps/accounts/templates/accounts/index.html
+++ b/django_conc/apps/accounts/templates/accounts/index.html
@ -0,0 +1,4 @@
+{% extends "core/pages/list.html" %}
+
+{% load static %}
+
--- a/django_conc/apps/accounts/tests.py
+++ b/django_conc/apps/accounts/tests.py
@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.
--- a/django_conc/apps/accounts/urls.py
+++ b/django_conc/apps/accounts/urls.py
@ -0,0 +1,17 @@
+from django.urls import path
+
+from . import views
+
+app_name = "accounts"
+
+urlpatterns = [
+    path("", views.Index.as_view(), name="index"),
+    path("new/", views.New.as_view(), name="new"),
+    path("edit/<uuid:pk>/", views.Edit.as_view(), name="edit"),
+    path(
+        "confirm-delete/<uuid:pk>/",
+        views.ConfirmDelete.as_view(),
+        name="confirm_delete",
+    ),
+    path("delete/<uuid:pk>/", views.Delete.as_view(), name="delete"),
+]
--- a/django_conc/apps/accounts/views.py
+++ b/django_conc/apps/accounts/views.py
@ -0,0 +1,30 @@
+from ..core import views as cv
+from . import forms
+from .models import User
+
+
+class Common(cv.Common):
+    app_name = "accounts"
+    model = User
+
+
+class Crud(Common):
+    form_class = forms.NewUserForm
+
+
+class Index(Common, cv.List):
+    template_name = "accounts/index.html"
+    paginate_by = 10
+    form_class = forms.ListUserForm
+
+
+class New(Crud, cv.New): ...
+
+
+class Edit(Crud, cv.Update): ...
+
+
+class ConfirmDelete(Crud, cv.ConfirmDelete): ...
+
+
+class Delete(Common, cv.Delete): ...
--- a/django_conc/apps/core/init.py
+++ b/django_conc/apps/core/init.py
@ -0,0 +1 @@
+
--- a/django_conc/apps/core/admin.py
+++ b/django_conc/apps/core/admin.py
@ -0,0 +1,3 @@
+from django.contrib import admin
+
+# Register your models here.
--- a/django_conc/apps/core/apps.py
+++ b/django_conc/apps/core/apps.py
@ -0,0 +1,7 @@
+from django.apps import AppConfig
+
+
+class CoreConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "core"
+    default = False
--- a/django_conc/apps/core/helpers.py
+++ b/django_conc/apps/core/helpers.py
@ -0,0 +1,69 @@
+import os
+from enum import Enum
+from io import BytesIO
+from uuid import uuid4
+
+from django.utils.deconstruct import deconstructible
+from PIL import Image
+
+
+@deconstructible
+class UploadToPathAndRename(object):
+    def __init__(self, path):
+        self.sub_path = path
+
+    def __call__(self, instance, filename):
+        ext = filename.split(".")[-1]
+        filename = "{}.{}".format(uuid4().hex, ext)
+        return os.path.join(self.sub_path, filename)
+
+
+class AvatarThumbnail:
+    def create_thumb(self, image, size=(200, 200)):
+        temp_file = BytesIO()
+        img = Image.open(image).convert("RGB")
+
+        if (
+            isinstance(size, tuple)
+            and len(size) == 2
+            and isinstance(size[0], int)
+            and isinstance(size[1], int)
+        ):
+            try:
+                width, height = img.size
+                if width > size[0] and height > size[1]:
+                    img.thumbnail((width, height))
+
+                if height < width:
+                    left = (width - height) / 2
+                    right = (width + height) / 2
+                    top = 0
+                    bottom = height
+                    img = img.crop((left, top, right, bottom))
+
+                elif width < height:
+                    left = 0
+                    right = width
+                    top = 0
+                    bottom = width
+                    img = img.crop((left, top, right, bottom))
+
+                if width > size[0] and height > size[1]:
+                    img.thumbnail((size[0], size[1]))
+
+                img.save(temp_file, format="WEBP")
+
+            except Exception as e:
+                print(e)
+
+            return temp_file
+
+        raise ValueError(
+            "The size must be a tuple of integer with length and width values. Example (350,350)."
+        )
+
+
+def is_mobile(request):
+    if "mobile" in request.META.get("HTTP_USER_AGENT", "").lower():
+        return True
+    return False
--- a/django_conc/apps/core/management/commands/elements.py
+++ b/django_conc/apps/core/management/commands/elements.py
@ -0,0 +1,35 @@
+from decouple import config
+from django.core.management.base import BaseCommand
+from django.utils.translation import gettext_lazy as _
+
+from django_conc.apps.accounts.models import User
+
+
+class AppException(Exception, BaseCommand):
+    def __init__(self, exception):
+        print(
+            BaseCommand().stdout.write(
+                BaseCommand().style.NOTICE(f"Error: {exception}")
+            )
+        )
+
+
+class Command(BaseCommand):
+    help = _("Creates initial information for application")
+    su_created = False
+
+    def handle(self, *args, **options):
+        if not User.objects.filter(username=config("ADMIN_USERNAME")):
+            su = User.objects.create_superuser(
+                username=config("ADMIN_USERNAME"),
+                email=config("ADMIN_EMAIL"),
+                password=config("ADMIN_PASSWORD"),
+                is_active=True,
+                is_staff=True,
+            )
+            if su:
+                self.stdout.write(self.style.SUCCESS(_("Superuser created!")))
+        else:
+            self.stdout.write(
+                self.style.NOTICE(_("Superuser already exists!"))
+            )
--- a/django_conc/apps/core/managers.py
+++ b/django_conc/apps/core/managers.py
@ -0,0 +1,11 @@
+from django.db import models
+
+
+class BaseManager(models.Manager):
+    def find(self, pk):
+        queryset = self.get_queryset().filter(pk=pk)
+
+        if queryset:
+            return queryset.first()
+
+        return self.queryset.none()
--- a/django_conc/apps/core/middleware.py
+++ b/django_conc/apps/core/middleware.py
@ -0,0 +1,27 @@
+from django.contrib import messages
+from django.core.signals import got_request_exception
+from django.http import HttpResponseRedirect
+from django.utils.translation import gettext as _
+
+from .models import ConcurrentUpdateException
+
+
+class ConcurrencyMiddleware:
+    """Intercept :ref:`ConcurrentUpdateException` and  redirect to the same view passing an error message."""
+
+    def __init__(self, get_response=None):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        response = self.get_response(request)
+        return response
+
+    def process_exception(self, request, exception):
+        if isinstance(exception, ConcurrentUpdateException):
+            got_request_exception.send(sender=self, request=request)
+            messages.add_message(
+                request,
+                messages.ERROR,
+                _("The object has changed during the transaction."),
+            )
+            return HttpResponseRedirect(request.path)
--- a/django_conc/apps/core/migrations/init.py
+++ b/django_conc/apps/core/migrations/init.py
--- a/django_conc/apps/core/mixins.py
+++ b/django_conc/apps/core/mixins.py
@ -0,0 +1,22 @@
+from django.conf import settings
+from django.contrib.auth.mixins import AccessMixin
+from django.http import HttpResponseRedirect
+from django.shortcuts import render, resolve_url
+
+
+class HtmxMixin(AccessMixin):
+    def dispatch(self, request, *args, **kwargs):
+        if not request.headers.get("Hx-request"):
+            return self.handle_no_permission()
+        return super().dispatch(request, *args, **kwargs)
+
+    def handle_no_permission(self):
+        if self.request.user.is_anonymous:
+            return self.redirect_to_login_redirect()
+
+        return HttpResponseRedirect(resolve_url(settings.LOGIN_REDIRECT_URL))
+
+    def redirect_to_login_redirect(self):
+        redire = render(self.request, "core/pages/void.html")
+        redire["HX-Redirect"] = ""
+        return redire
--- a/django_conc/apps/core/models.py
+++ b/django_conc/apps/core/models.py
@ -0,0 +1,131 @@
+from django import forms
+from django.contrib.admin.widgets import AdminIntegerFieldWidget
+from django.core.exceptions import ImproperlyConfigured
+from django.db import models
+from django.utils.translation import gettext_lazy as _
+
+
+class ConcurrentUpdateException(Exception):
+    """
+    Raised when a model can not be saved due to a concurrent update.
+    """
+
+    def __init__(self, *args, **kwargs):
+        self.target = kwargs.pop("target")
+        super().__init__(*args, **kwargs)
+
+
+class ReadonlyInput(forms.TextInput):
+    """
+    A HiddenInput would be perfect for version fields, but hidden
+    inputs leave ugly empty rows in the admin. The version must
+    be submitted, of course, to be checked, so we can't just use
+    ModelAdmin.readonly_fields.
+
+    Pending Django ticket #11277, this displays the version in an
+    uneditable input so there's no empty row in the admin table.
+
+    https://code.djangoproject.com/ticket/11277
+    """
+
+    def __init__(self, *args, **kwargs):
+        super(ReadonlyInput, self).__init__(*args, **kwargs)
+        # just readonly, because disabled won't submit the value
+        self.attrs["readonly"] = "readonly"
+
+
+class VersionField(models.PositiveIntegerField):
+    """
+    An integer field to track versions. Every time the model is saved,
+    it is incremented by one.
+    """
+
+    def __init__(self, *args, **kwargs):
+        kwargs.setdefault("default", 0)
+        super(VersionField, self).__init__(*args, **kwargs)
+
+    def formfield(self, **kwargs):
+        widget = kwargs.get("widget")
+        if widget:
+            if issubclass(widget, AdminIntegerFieldWidget):
+                widget = ReadonlyInput()
+        else:
+            widget = forms.HiddenInput
+        kwargs["widget"] = widget
+        return super(VersionField, self).formfield(**kwargs)
+
+
+class VersionedModel(models.Model):
+    # class VersionedBaseModel:
+    """
+    Model mixin implementing version checking during saving.
+    When a concurrent update is detected, saving is aborted and
+    ConcurrentUpdate will be raised.
+    """
+
+    version = VersionField(_("Version"))
+
+    def _do_update(
+        self, base_qs, using, pk_val, values, update_fields, forced_update
+    ):
+        version_field = self.get_version_field()
+
+        # _do_update is called once for each model in the inheritance
+        # hierarchy. We only care about the model with the version field.
+        if version_field.model != base_qs.model:
+            return super()._do_update(
+                base_qs, using, pk_val, values, update_fields, forced_update
+            )
+
+        if version_field.attname in self.get_deferred_fields():
+            # With a deferred VersionField, it's not possible to do any
+            # sensible concurrency checking, so throw an error. The
+            # other option would be to treat deferring the VersionField
+            # the same as excluding it from `update_fields` -- a way to
+            # bypass checking altogether.
+            raise RuntimeError(
+                "It doesn't make sense to save a model with a deferred VersionField"
+            )
+
+        # pre_save may or may not have been called at this point, based on if
+        # version_field is in update_fields. Since we need to reliably know the
+        # old version, we can't increment there.
+        old_version = version_field.value_from_object(self)
+
+        # so increment it here instead. Now old_version is reliable.
+        for i, value_tuple in enumerate(values):
+            if isinstance(value_tuple[0], VersionField):
+                assert old_version == value_tuple[2]
+                values[i] = (
+                    value_tuple[0],
+                    value_tuple[1],
+                    value_tuple[2] + 1,
+                )
+                setattr(self, version_field.attname, old_version + 1)
+
+        updated = super()._do_update(
+            base_qs=base_qs.filter(**{version_field.attname: old_version}),
+            using=using,
+            pk_val=pk_val,
+            values=values,
+            update_fields=(
+                update_fields if values else None
+            ),  # Make sure base_qs is always checked
+            forced_update=forced_update,
+        )
+
+        if not updated and base_qs.filter(pk=pk_val).exists():
+            raise ConcurrentUpdateException(target=base_qs)
+
+        return updated
+
+    def get_version_field(self):
+        for field in self._meta.fields:
+            if isinstance(field, VersionField):
+                return field
+        raise ImproperlyConfigured(
+            "VersionedMixin models must have a VersionField"
+        )
+
+    class Meta:
+        abstract = True
--- a/django_conc/apps/core/static/core/_hs/main._hs
+++ b/django_conc/apps/core/static/core/_hs/main._hs
@ -0,0 +1,31 @@
+on every contextmenu
+    halt
+end
+
+behavior HideModal(id)
+    on click
+        if id
+            set :children to Array.from(id.children)
+            for x in :children
+                remove x
+            end
+        end
+    end
+end
+
+behavior PulseModal(id)
+    on click
+        if target == me
+            transition scale to 1.05 over 0.1s then transition scale to initial over 0.1s
+        end
+    end
+end
+
+behavior Toast()
+    on load
+        transition my *top to 50px
+        then wait 3s
+        then transition my *top to initial
+        then remove me
+    end
+end
--- a/django_conc/apps/core/static/core/css/main.css
+++ b/django_conc/apps/core/static/core/css/main.css
@ -0,0 +1,226 @@
+*,
+*::before,
+*::after {
+    box-sizing: border-box;
+    margin: 0;
+    padding: 0;
+}
+
+html {
+    scroll-behavior: smooth;
+}
+
+body {
+    display: grid;
+    text-rendering: optimizeSpeed;
+    line-height: 1.5rem;
+    place-content: center;
+    align-items: center;
+    height: 100vh;
+}
+
+a {
+    display: inline-block;
+    line-height: normal;
+}
+
+a:not([class]) {
+    text-decoration-skip-ink: auto;
+}
+
+table {
+    min-width: 600px;
+}
+
+tr {
+    text-align: center;
+}
+
+th,
+td {
+    border: 1px solid black;
+    padding: 0.5rem;
+}
+
+input:not([type="checkbox"]) {
+    color: var(--color-text, #65666d);
+    display: block;
+    width: 100%;
+    height: var(--input-height, calc(1.5em + 0.75rem + 2px));
+    padding: 0.375rem 0.75rem;
+    font-size: 1rem;
+    font-weight: 400;
+    line-height: 1.5;
+    background-color: fff;
+    background-clip: padding-box;
+    border: 1px solid #d1d3e2;
+    border-radius: 0.35rem;
+    transition:
+        border-color 0.15s ease-in-out,
+        box-shadow 0.15s ease-in-out;
+}
+
+input:focus {
+    color: var(--color-text, #65666d);
+    background-color: var(--input-color-background, #fff);
+    border-color: var(--input-color-border-focus, #96c8da);
+    outline: 0;
+    box-shadow: 0 0 0 0.1rem var(--input-color-focus, rgba(78, 115, 223, 0.1));
+}
+
+.btn {
+    padding: 0.5rem 1rem;
+    border: 1px solid black;
+    background-color: #b9bbbd;
+    text-decoration: none;
+    color: white;
+    font-weight: bold;
+    cursor: pointer;
+    text-transform: uppercase;
+}
+
+.btn-small {
+    padding: 0.25rem 0.5rem;
+    background-color: #b9bbbd;
+}
+
+.btn:hover {
+    background-color: #a9c7ff;
+}
+
+.btn-primary {
+    background-color: #7297f0;
+}
+
+.btn-secondary {
+    background-color: #5b5c60;
+}
+
+.btn-danger {
+    background-color: #e66969;
+}
+
+a.btn {
+    text-decoration: none;
+}
+
+.helptext {
+    font-size: 0.8rem;
+}
+
+.errorlist {
+    background-color: #ff9a92;
+    color: white;
+    padding: 1rem;
+    font-weight: bold;
+}
+
+.flex {
+    display: flex;
+}
+
+.align-center {
+    align-items: center;
+}
+
+.justify-center {
+    justify-content: center;
+}
+
+.justify-between {
+    justify-content: space-between;
+}
+
+.gap-1 {
+    gap: 1rem;
+}
+
+.modal-container {
+    position: fixed;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    left: 0;
+    top: 0;
+    width: 100vw;
+    height: 100vh;
+    overflow: auto;
+    z-index: 205;
+}
+
+.modal-content {
+    display: grid;
+    position: relative;
+    place-items: center;
+    grid-template-rows: 50px 1fr 50px;
+    grid-template-areas: "header" "body" "footer";
+    margin: auto;
+    width: 600px;
+    max-width: calc(100vw - 2rem);
+    padding: 0.5rem 1rem 1rem 1rem;
+    background-color: white;
+    outline: 0;
+    border-radius: 0.3rem;
+    z-index: 250;
+}
+
+.modal-header {
+    grid-area: header;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    width: 100%;
+    border-bottom: 1px solid #e5e5e5;
+    padding-bottom: 0.5rem;
+}
+
+.modal-body {
+    grid-area: body;
+    padding: 1rem;
+    width: 100%;
+    max-height: 100%;
+}
+
+.modal-footer {
+    grid-area: footer;
+    display: flex;
+    align-items: center;
+    justify-content: flex-end;
+    width: 100%;
+    gap: 10px;
+    padding-top: 1rem;
+    border-top: 1px solid #e5e5e5;
+}
+
+.modal-backdrop {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    height: 100vh;
+    backdrop-filter: blur(2px);
+    background-color: rgba(0, 0, 0, 0.6);
+    z-index: 200;
+}
+
+.alert {
+    padding: 1rem;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+}
+
+.alert-error {
+    background-color: #ff1161;
+    color: white;
+}
+
+.toast {
+    position: fixed;
+    width: 50%;
+    left: 50%;
+    top: -250px;
+    transform: translateX(-50%);
+    padding: 1.5rem;
+    z-index: 100;
+}
--- a/django_conc/apps/core/static/core/js/vendor/_hyperscript.min.js
+++ b/django_conc/apps/core/static/core/js/vendor/_hyperscript.min.js
--- a/django_conc/apps/core/static/core/js/vendor/htmx.min.js
+++ b/django_conc/apps/core/static/core/js/vendor/htmx.min.js
--- a/django_conc/apps/core/templates/core/base.html
+++ b/django_conc/apps/core/templates/core/base.html
@ -0,0 +1,47 @@
+{% load static %}
+
+<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <link rel="stylesheet"
+              href="{% static 'core/css/main.css' %}">
+        <title>
+            {% block title %}
+                Django Concurrency
+            {% endblock title %}
+
+        </title>
+    </head>
+    <body>
+        {% if messages %}
+            {% for message in messages %}
+                <div class="toast" _="install Toast()">
+                    <div class="alert alert-{{ message.tags }}">
+                        {{ message }}
+                    </div>
+                </div>
+            {% endfor %}
+        {% endif %}
+        {% block main %}
+        {% endblock main %}
+
+        <div id="Modal">
+        </div>
+        <script>
+        document.body.addEventListener("htmx:configRequest", (event) => {
+            event.detail.headers["X-CSRFToken"] = "{{csrf_token}}";
+        });
+        </script>
+        {% block script %}
+        {% endblock script %}
+
+        {% block hyperscript %}
+        {% endblock hyperscript %}
+
+        <script type="text/hyperscript"
+                src="{% static 'core/_hs/main._hs' %}"></script>
+        <script src="{% static 'core/js/vendor/_hyperscript.min.js' %}"></script>
+        <script src="{% static 'core/js/vendor/htmx.min.js' %}"></script>
+    </body>
+</html>
--- a/django_conc/apps/core/templates/core/pages/confirm_delete.html
+++ b/django_conc/apps/core/templates/core/pages/confirm_delete.html
@ -0,0 +1,38 @@
+{% extends "core/partials/modal/base.html" %}
+
+{% load tag_helpers i18n %}
+
+{% block modal_content %}
+    <form action="{% url extra_content.urls.delete object.pk %}"
+          method="post">
+        {% csrf_token %}
+        {{ block.super }}
+    </form>
+{% endblock modal_content %}
+
+{% block modal_header %}
+    <h2>{% translate "Confirm Delete" %}</h2>
+{% endblock modal_header %}
+
+{% block modal_body %}
+    {{ block.super }}
+    <div class="row mb-5">
+        <div class="md-12 text-center">
+            <h3>{% translate "Confirm delete the object" %} "{{ object }}",</h3>
+            <h4>{% translate "Are you sure ?" %}</h4>
+        </div>
+    </div>
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <button class="btn btn-primary btn-rounded"
+            hx-post="{% url extra_content.urls.delete object.pk %}"
+            hx-target="#Modal">
+        {% translate "Confirm" %}
+    </button>
+    <button class="btn btn-secondary btn-rounded"
+       type="button"
+       _="install HideModal(id:#Modal)">
+        {% translate "Cancel" %}
+    </button>
+{% endblock modal_footer %}
--- a/django_conc/apps/core/templates/core/pages/confirm_exit.html
+++ b/django_conc/apps/core/templates/core/pages/confirm_exit.html
@ -0,0 +1,42 @@
+{% extends "core/partials/modal/base.html" %}
+
+{% load tag_helpers i18n %}
+
+{% block modal_content %}
+    <form action="{% url 'logout' %}"
+        method="post">
+        {% csrf_token %}
+        {{ block.super }}
+    </form>
+{% endblock modal_content %}
+
+{% block modal_header %}
+    <h2>
+        {% translate "Confirm Exit" %}
+    </h2>
+{% endblock modal_header %}
+
+{% block modal_body %}
+    <div class="row mb-5">
+        <div class="md-12 text-center">
+            <h3>
+                {% translate "Confirm exit application" %},
+            </h3>
+            <h4>
+                {% translate "Are you sure ?" %}
+            </h4>
+        </div>
+    </div>
+{% endblock modal_body %}
+
+{% block modal_footer %}
+    <button class="btn btn-primary btn-rounded" type="submit">
+       {% translate "Confirm" %}
+    </button>
+    <button class="btn btn-secondary btn-rounded"
+            type="button"
+            href="javascript:void(0);"
+            _="install HideModal(id:#Modal)">
+        {% translate "Cancel" %}
+    </button>
+{% endblock modal_footer %}
--- a/django_conc/apps/core/templates/core/pages/form.html
+++ b/django_conc/apps/core/templates/core/pages/form.html
@ -0,0 +1,12 @@
+{% extends "core/pages/list.html" %}
+
+{% block main %}
+    <div>
+        <a class="btn btn-secondary" href="{% url extra_content.urls.index %}">BACK</a>
+    </div>
+    <form action="" method="post" autocomplete="off"  enctype='multipart/form-data' style="margin-top: 2rem;display: grid;gap:1rem">
+        {% csrf_token %}
+        {{ form.as_p }}
+        <button type="submit" class="btn btn-primary">SAVE</button>
+    </form>
+{% endblock main %}
--- a/django_conc/apps/core/templates/core/pages/index.html
+++ b/django_conc/apps/core/templates/core/pages/index.html
@ -0,0 +1,7 @@
+{% extends "core/base.html" %}
+
+{% load static %}
+
+{% block main %}
+    <a class="btn btn-primary" href="{% url 'core:accounts:index' %}">Users</a>
+{% endblock main %}
--- a/django_conc/apps/core/templates/core/pages/list.html
+++ b/django_conc/apps/core/templates/core/pages/list.html
@ -0,0 +1,56 @@
+{% extends "core/base.html" %}
+
+{% load static tag_helpers %}
+
+{% block main %}
+    <div class="flex align-center justify-between" style="margin-bottom:1rem;">
+        <span>User: {{ request.user }}</span>
+        <form action="{% url 'logout' %}" method="post">
+            {% csrf_token %}
+            <button
+                class="btn btn-small"
+                hx-get="{% url 'core:confirm_exit' %}"
+                hx-target="#Modal"
+            >Logout</button>
+        </form>
+    </div>
+
+    <div>
+        <a class="btn btn-primary" href="{% url extra_content.urls.new %}">New</a>
+    </div>
+
+    <table style="margin-top:2rem">
+        {% with form|get_meta:"actions" as actions %}
+        <tr>
+            {% if actions %}
+                <th>Actions</th>
+            {% endif %}
+            {% for field in form.fields %}
+                <th>{{ field|capfirst }}</th>
+            {% endfor %}
+        </tr>
+        {% for object in object_list %}
+            <tr>
+                {% if actions %}
+                    <td>
+                        <div class="flex align-center justify-center gap-1">
+                            <a class="btn btn-small btn-secondary" href="{% url extra_content.urls.edit object.pk %}">Edit</a>
+                            <button
+                                type="button"
+                                class="btn btn-small btn-danger"
+                                hx-post="{% url extra_content.urls.confirm object.pk %}"
+                                hx-target="#Modal"
+                            >
+                                Remove
+                            </button>
+                        </div>
+                    </td>
+                {% endif %}
+                {% for field in form.fields %}
+                    <td>{{ object|get_field:field }}</td>
+                {% endfor %}
+            </tr>
+        {% endfor %}
+        {% endwith %}
+    </table>
+{% endblock main %}
--- a/django_conc/apps/core/templates/core/pages/void.html
+++ b/django_conc/apps/core/templates/core/pages/void.html
--- a/django_conc/apps/core/templates/core/partials/modal/base.html
+++ b/django_conc/apps/core/templates/core/partials/modal/base.html
@ -0,0 +1,36 @@
+{% load tag_helpers i18n %}
+
+<div class="modal-container grid-center"
+     _="install PulseModal(id:#Modal)">
+    {% block modal_content %}
+        <div class="modal-content">
+            <div class="modal-header">
+                {% block modal_header %}
+                    <h2>
+                        Modal title
+                    </h2>
+                {% endblock modal_header %}
+
+            </div>
+            <div class="modal-body o-scroll"
+                 style="max-height:80vh">
+                {% block modal_body %}
+                {% endblock modal_body %}
+
+            </div>
+            <div class="modal-footer">
+                {% block modal_footer %}
+                    <button class="btn btn-secondary"
+                            type="button"
+                            _="install HideModal(id:#Modal)">
+                        {% translate "Cancel" %}
+                    </button>
+                {% endblock modal_footer %}
+
+            </div>
+        </div>
+    {% endblock modal_content %}
+
+</div>
+<div class="modal-backdrop">
+</div>
--- a/django_conc/apps/core/templatetags/tag_helpers.py
+++ b/django_conc/apps/core/templatetags/tag_helpers.py
@ -0,0 +1,31 @@
+from django import template
+from django.db.models.fields.files import FieldFile, ImageFieldFile
+from django.utils.safestring import mark_safe
+
+register = template.Library()
+
+
+@register.filter(name="times")
+def times(start, end=None):
+    """Return a range starting 1 by default until number informed."""
+    if end:
+        return range(int(start), int(end))
+    return range(1, int(start))
+
+
+@register.filter(name="get_field")
+def get_field(obj, field):
+    """Return an object attribute"""
+    field = getattr(obj, field)
+    if isinstance(field, ImageFieldFile) or isinstance(field, FieldFile):
+        if field:
+            return mark_safe(
+                f'<a class="btn btn-small btn-secondary" target="_blank" href="{field.url}">attach</a>'
+            )
+    return field
+
+
+@register.filter(name="get_meta")
+def get_meta(form, attr):
+    """Return an attribute from form meta class"""
+    return getattr(form.Meta, attr, None)
--- a/django_conc/apps/core/tests.py
+++ b/django_conc/apps/core/tests.py
@ -0,0 +1,3 @@
+from django.test import TestCase
+
+# Create your tests here.
--- a/django_conc/apps/core/urls.py
+++ b/django_conc/apps/core/urls.py
@ -0,0 +1,17 @@
+from django.urls import include, path
+
+from . import views
+
+app_name = "core"
+
+urlpatterns = [
+    path("", views.Index.as_view(), name="index"),
+    path("confirm-exit/", views.ConfirmExit.as_view(), name="confirm_exit"),
+    path(
+        "accounts/",
+        include(
+            "django_conc.apps.accounts.urls",
+            namespace="accounts",
+        ),
+    ),
+]
--- a/django_conc/apps/core/views.py
+++ b/django_conc/apps/core/views.py
@ -0,0 +1,134 @@
+from django.contrib.auth.mixins import LoginRequiredMixin
+from django.core.exceptions import ValidationError
+from django.db.models import ProtectedError
+from django.shortcuts import render
+from django.urls import reverse_lazy
+from django.utils.translation import gettext_lazy as _
+from django.views.generic import CreateView, DeleteView, ListView, TemplateView, \
+    UpdateView
+
+from . import mixins
+
+
+class Common:
+    app_name = None
+    model = None
+    page_title = None
+
+    def __init__(self):
+        self.success_url = reverse_lazy(f"core:{self.app_name}:index")
+        self.extra_content = {
+            "urls": {
+                "index": f"core:{self.app_name}:index",
+                "new": f"core:{self.app_name}:new",
+                "edit": f"core:{self.app_name}:edit",
+                "search": f"core:{self.app_name}:search",
+                "confirm": f"core:{self.app_name}:confirm_delete",
+                "delete": f"core:{self.app_name}:delete",
+                "detail": f"core:{self.app_name}:detail",
+            },
+            "page_title": "Index",
+        }
+
+    def get_text_url(self, action="index"):
+        return f"core:{self.app_name}:{action}"
+
+    def get_url(self, action, kwargs=None):
+        return reverse_lazy(self.get_text_url(action), kwargs=kwargs)
+
+    def get_pk(self, name="pk"):
+        return self.kwargs.get(name)
+
+    def htmx_redirect_to(
+        self, request, url, context={}, template_name="core/pages/void.html"
+    ):
+        redire = render(
+            request=request, template_name=template_name, context=context
+        )
+        redire["HX-Redirect"] = url
+        return redire
+
+
+class Index(LoginRequiredMixin, TemplateView):
+    template_name = "core/pages/index.html"
+
+
+class CrudViews(LoginRequiredMixin, Common):
+    def __init__(self):
+        super().__init__()
+        self.extra_content.update(page_title=self.page_title)
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context["extra_content"] = self.extra_content
+
+        return context
+
+
+class Base(CrudViews, TemplateView):
+    template_name = "core/pages/void.html"
+
+
+class List(CrudViews, ListView):
+    template_name = "core/pages/index.html"
+    paginate_by = 10
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context["form"] = self.form_class
+        return context
+
+
+class New(CrudViews, CreateView):
+    template_name = "core/pages/form.html"
+    page_title = "New"
+
+
+class Update(CrudViews, UpdateView):
+    template_name = "core/pages/form.html"
+    page_title = "Update"
+
+
+class ConfirmDelete(mixins.HtmxMixin, CrudViews, TemplateView):
+    template_name = "core/pages/confirm_delete.html"
+    action_url = None
+
+    def post(self, request, *args, **kwargs):
+        data = {
+            "object": self.model.objects.filter(pk=kwargs.get("pk")).first(),
+            "extra_content": self.extra_content,
+        }
+        return render(request, self.template_name, context=data)
+
+
+class Delete(CrudViews, DeleteView):
+    template_name = "core/pages/confirm_delete.html"
+
+    def form_valid(self, form):
+        context = self.get_context_data()
+
+        try:
+            self.object.delete()
+        except ProtectedError as e:
+            form.add_error(
+                None,
+                ValidationError(
+                    _(
+                        "Cannot delete some instances because they are referenced through protected objects: %(value)s)"
+                    ),
+                    code="protected",
+                    params={"value": e.protected_objects},
+                ),
+            )
+
+            context.update(form=form, extra_content=self.extra_content)
+            return self.render_to_response(context=context)
+
+        return self.htmx_redirect_to(
+            request=self.request, url=self.get_success_url(), context=context
+        )
+
+
+class ConfirmExit(LoginRequiredMixin, mixins.HtmxMixin, TemplateView):
+    template_name = "core/pages/confirm_exit.html"
+    http_method_names = ["get"]
--- a/django_conc/asgi.py
+++ b/django_conc/asgi.py
@ -0,0 +1,16 @@
+"""
+ASGI config for django_conc project.
+
+It exposes the ASGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/5.0/howto/deployment/asgi/
+"""
+
+import os
+
+from django.core.asgi import get_asgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "django_conc.settings")
+
+application = get_asgi_application()
--- a/django_conc/settings.py
+++ b/django_conc/settings.py
@ -0,0 +1,145 @@
+"""
+Django settings for django_conc project.
+
+Generated by 'django-admin startproject' using Django 5.0.2.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/5.0/topics/settings/
+
+For the full list of settings and their values, see
+https://docs.djangoproject.com/en/5.0/ref/settings/
+"""
+
+import os
+from pathlib import Path
+
+from decouple import Csv, config
+from dj_database_url import parse as dburl
+
+# Build paths inside the project like this: BASE_DIR / 'subdir'.
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+# Quick-start development settings - unsuitable for production
+# See https://docs.djangoproject.com/en/5.0/howto/deployment/checklist/
+
+# SECURITY WARNING: keep the secret key used in production secret!
+SECRET_KEY = config("SECRET_KEY")
+
+# SECURITY WARNING: don't run with debug turned on in production!
+DEBUG = config("DEBUG", default=False, cast=bool)
+
+ALLOWED_HOSTS = config("ALLOWED_HOSTS", cast=Csv())
+
+
+# Application definition
+
+INSTALLED_APPS = [
+    "django.contrib.admin",
+    "django.contrib.auth",
+    "django.contrib.contenttypes",
+    "django.contrib.sessions",
+    "django.contrib.messages",
+    "django.contrib.staticfiles",
+    "django_extensions",
+    "django_conc.apps.core",
+    "django_conc.apps.accounts",
+]
+
+MIDDLEWARE = [
+    "django.middleware.security.SecurityMiddleware",
+    "django_conc.apps.core.middleware.ConcurrencyMiddleware",
+    "django.contrib.sessions.middleware.SessionMiddleware",
+    "django.middleware.common.CommonMiddleware",
+    "django.middleware.csrf.CsrfViewMiddleware",
+    "django.contrib.auth.middleware.AuthenticationMiddleware",
+    "django.contrib.messages.middleware.MessageMiddleware",
+    "django.middleware.clickjacking.XFrameOptionsMiddleware",
+]
+
+ROOT_URLCONF = "django_conc.urls"
+
+TEMPLATES = [
+    {
+        "BACKEND": "django.template.backends.django.DjangoTemplates",
+        "DIRS": ["templates", BASE_DIR / "templates"],
+        "APP_DIRS": True,
+        "OPTIONS": {
+            "context_processors": [
+                "django.template.context_processors.debug",
+                "django.template.context_processors.request",
+                "django.contrib.auth.context_processors.auth",
+                "django.contrib.messages.context_processors.messages",
+            ],
+        },
+    },
+]
+
+WSGI_APPLICATION = "django_conc.wsgi.application"
+
+# Database
+# https://docs.djangoproject.com/en/5.0/ref/settings/#databases
+
+default_dburl = "sqlite:///" + os.path.join(BASE_DIR, "db.sqlite3")
+
+DATABASES = {
+    "default": config("DATABASE_URL", default=default_dburl, cast=dburl),
+}
+
+# Password validation
+# https://docs.djangoproject.com/en/5.0/ref/settings/#auth-password-validators
+
+AUTH_PASSWORD_VALIDATORS = [
+    {
+        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
+    },
+    {
+        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
+    },
+]
+
+
+# Internationalization
+# https://docs.djangoproject.com/en/5.0/topics/i18n/
+
+LANGUAGE_CODE = "en-us"
+
+TIME_ZONE = "UTC"
+
+USE_I18N = True
+
+USE_TZ = True
+
+
+# Static files (CSS, JavaScript, Images)
+# https://docs.djangoproject.com/en/5.0/howto/static-files/
+
+STATIC_URL = "static/"
+
+STATICFILES_DIRS = [
+    os.path.join(BASE_DIR, "staticfiles"),
+]
+
+MEDIA_URL = "/media/"
+
+MEDIA_ROOT = os.path.join(BASE_DIR, "media")
+
+STATIC_ROOT = os.path.join(BASE_DIR, "static/")
+
+# Default primary key field type
+# https://docs.djangoproject.com/en/5.0/ref/settings/#default-auto-field
+
+DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"
+
+AUTH_USER_MODEL = "accounts.User"
+
+LOGIN_URL = "login"
+
+LOGIN_REDIRECT_URL = "core:index"
+
+LOGOUT_REDIRECT_URL = "login"
--- a/django_conc/urls.py
+++ b/django_conc/urls.py
@ -0,0 +1,33 @@
+"""
+URL configuration for django_conc project.
+
+The `urlpatterns` list routes URLs to views. For more information please see:
+    https://docs.djangoproject.com/en/5.0/topics/http/urls/
+Examples:
+Function views
+    1. Add an import:  from my_app import views
+    2. Add a URL to urlpatterns:  path('', views.home, name='home')
+Class-based views
+    1. Add an import:  from other_app.views import Home
+    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
+Including another URLconf
+    1. Import the include() function: from django.urls import include, path
+    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
+"""
+
+from django.conf import settings
+from django.conf.urls.static import static
+from django.contrib import admin
+from django.contrib.auth import views as auth_views
+from django.urls import include, path
+
+urlpatterns = [
+    path("", include("django_conc.apps.core.urls", namespace="core")),
+    path("auth/sign_in/", auth_views.LoginView.as_view(), name="login"),
+    path("auth/logout/", auth_views.LogoutView.as_view(), name="logout"),
+] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
+
+if settings.DEBUG:
+    urlpatterns += [
+        path("admin/", admin.site.urls),
+    ]
--- a/django_conc/wsgi.py
+++ b/django_conc/wsgi.py
@ -0,0 +1,16 @@
+"""
+WSGI config for django_conc project.
+
+It exposes the WSGI callable as a module-level variable named ``application``.
+
+For more information on this file, see
+https://docs.djangoproject.com/en/5.0/howto/deployment/wsgi/
+"""
+
+import os
+
+from django.core.wsgi import get_wsgi_application
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "django_conc.settings")
+
+application = get_wsgi_application()
--- a/manage.py
+++ b/manage.py
@ -0,0 +1,22 @@
+#!/usr/bin/env python
+"""Django's command-line utility for administrative tasks."""
+import os
+import sys
+
+
+def main():
+    """Run administrative tasks."""
+    os.environ.setdefault("DJANGO_SETTINGS_MODULE", "django_conc.settings")
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and "
+            "available on your PYTHONPATH environment variable? Did you "
+            "forget to activate a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == "__main__":
+    main()
--- a/poetry.lock
+++ b/poetry.lock
@ -0,0 +1,345 @@
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+
+[[package]]
+name = "asgiref"
+version = "3.7.2"
+description = "ASGI specs, helper code, and adapters"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "asgiref-3.7.2-py3-none-any.whl", hash = "sha256:89b2ef2247e3b562a16eef663bc0e2e703ec6468e2fa8a5cd61cd449786d4f6e"},
+    {file = "asgiref-3.7.2.tar.gz", hash = "sha256:9e0ce3aa93a819ba5b45120216b23878cf6e8525eb3848653452b4192b92afed"},
+]
+
+[package.extras]
+tests = ["mypy (>=0.800)", "pytest", "pytest-asyncio"]
+
+[[package]]
+name = "dj-database-url"
+version = "2.1.0"
+description = "Use Database URLs in your Django Application."
+optional = false
+python-versions = "*"
+files = [
+    {file = "dj-database-url-2.1.0.tar.gz", hash = "sha256:f2042cefe1086e539c9da39fad5ad7f61173bf79665e69bf7e4de55fa88b135f"},
+    {file = "dj_database_url-2.1.0-py3-none-any.whl", hash = "sha256:04bc34b248d4c21aaa13e4ab419ae6575ef5f10f3df735ce7da97722caa356e0"},
+]
+
+[package.dependencies]
+Django = ">=3.2"
+typing-extensions = ">=3.10.0.0"
+
+[[package]]
+name = "dj-static"
+version = "0.0.6"
+description = "Serve production static files with Django."
+optional = false
+python-versions = "*"
+files = [
+    {file = "dj-static-0.0.6.tar.gz", hash = "sha256:032ec1c532617922e6e3e956d504a6fb1acce4fc1c7c94612d0fda21828ce8ef"},
+]
+
+[package.dependencies]
+static3 = "*"
+
+[[package]]
+name = "django"
+version = "5.0.2"
+description = "A high-level Python web framework that encourages rapid development and clean, pragmatic design."
+optional = false
+python-versions = ">=3.10"
+files = [
+    {file = "Django-5.0.2-py3-none-any.whl", hash = "sha256:56ab63a105e8bb06ee67381d7b65fe6774f057e41a8bab06c8020c8882d8ecd4"},
+    {file = "Django-5.0.2.tar.gz", hash = "sha256:b5bb1d11b2518a5f91372a282f24662f58f66749666b0a286ab057029f728080"},
+]
+
+[package.dependencies]
+asgiref = ">=3.7.0,<4"
+sqlparse = ">=0.3.1"
+tzdata = {version = "*", markers = "sys_platform == \"win32\""}
+
+[package.extras]
+argon2 = ["argon2-cffi (>=19.1.0)"]
+bcrypt = ["bcrypt"]
+
+[[package]]
+name = "django-cleanup"
+version = "8.1.0"
+description = "Deletes old files."
+optional = false
+python-versions = "*"
+files = [
+    {file = "django-cleanup-8.1.0.tar.gz", hash = "sha256:70df905076a44e7a111b31198199af633dee08876e199e6dce36ca8dd6b8b10f"},
+    {file = "django_cleanup-8.1.0-py2.py3-none-any.whl", hash = "sha256:7903873ea73b3f7e61e055340d27dba49b70634f60c87a573ad748e172836458"},
+]
+
+[[package]]
+name = "django-extensions"
+version = "3.2.3"
+description = "Extensions for Django"
+optional = false
+python-versions = ">=3.6"
+files = [
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+
+[package.dependencies]
+Django = ">=3.2"
+
+[[package]]
+name = "django-storages"
+version = "1.14.2"
+description = "Support for many storage backends in Django"
+optional = false
+python-versions = ">=3.7"
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+
+[package.dependencies]
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+
+[package.extras]
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+boto3 = ["boto3 (>=1.4.4)"]
+dropbox = ["dropbox (>=7.2.1)"]
+google = ["google-cloud-storage (>=1.27)"]
+libcloud = ["apache-libcloud"]
+s3 = ["boto3 (>=1.4.4)"]
+sftp = ["paramiko (>=1.15)"]
+
+[[package]]
+name = "pillow"
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+]
+
+[[package]]
+name = "python-decouple"
+version = "3.8"
+description = "Strict separation of settings from code."
+optional = false
+python-versions = "*"
+files = [
+    {file = "python-decouple-3.8.tar.gz", hash = "sha256:ba6e2657d4f376ecc46f77a3a615e058d93ba5e465c01bbe57289bfb7cce680f"},
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+]
+
+[[package]]
+name = "sqlparse"
+version = "0.4.4"
+description = "A non-validating SQL parser."
+optional = false
+python-versions = ">=3.5"
+files = [
+    {file = "sqlparse-0.4.4-py3-none-any.whl", hash = "sha256:5430a4fe2ac7d0f93e66f1efc6e1338a41884b7ddf2a350cedd20ccc4d9d28f3"},
+    {file = "sqlparse-0.4.4.tar.gz", hash = "sha256:d446183e84b8349fa3061f0fe7f06ca94ba65b426946ffebe6e3e8295332420c"},
+]
+
+[package.extras]
+dev = ["build", "flake8"]
+doc = ["sphinx"]
+test = ["pytest", "pytest-cov"]
+
+[[package]]
+name = "static3"
+version = "0.7.0"
+description = "A really simple WSGI way to serve static (or mixed) content."
+optional = false
+python-versions = "*"
+files = [
+    {file = "static3-0.7.0.tar.gz", hash = "sha256:674641c64bc75507af2eb20bef7e7e3593dca993dec6674be108fa15b42f47c8"},
+]
+
+[package.extras]
+genshimagic = ["Genshi"]
+kidmagic = ["kid"]
+
+[[package]]
+name = "typing-extensions"
+version = "4.9.0"
+description = "Backported and Experimental Type Hints for Python 3.8+"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "typing_extensions-4.9.0-py3-none-any.whl", hash = "sha256:af72aea155e91adfc61c3ae9e0e342dbc0cba726d6cba4b6c72c1f34e47291cd"},
+    {file = "typing_extensions-4.9.0.tar.gz", hash = "sha256:23478f88c37f27d76ac8aee6c905017a143b0b1b886c3c9f66bc2fd94f9f5783"},
+]
+
+[[package]]
+name = "tzdata"
+version = "2023.4"
+description = "Provider of IANA time zone data"
+optional = false
+python-versions = ">=2"
+files = [
+    {file = "tzdata-2023.4-py2.py3-none-any.whl", hash = "sha256:aa3ace4329eeacda5b7beb7ea08ece826c28d761cda36e747cfbf97996d39bf3"},
+    {file = "tzdata-2023.4.tar.gz", hash = "sha256:dd54c94f294765522c77399649b4fefd95522479a664a0cec87f41bebc6148c9"},
+]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.11"
+content-hash = "0f777838b72c1d9452050ee4b309fb5d50f9407ea5fcad2138b188288ce1bbfa"
--- a/pyproject.toml
+++ b/pyproject.toml
@ -0,0 +1,75 @@
+[tool.poetry]
+name = "django_conc"
+version = "0.1.0"
+description = ""
+authors = ["Lucas F. <lucas@lucasf.dev>"]
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.11"
+django = "^5.0.2"
+dj-database-url = "^2.1.0"
+django-storages = "^1.14.2"
+pillow = "^10.2.0"
+python-decouple = "^3.8"
+django-cleanup = "^8.1.0"
+psycopg2-binary = "^2.9.9"
+django-extensions = "^3.2.3"
+dj-static = "^0.0.6"
+
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.isort]
+profile = "black"
+line_length = 89
+multi_line_output = 2
+include_trailing_comma = false
+extend_skip = [
+ ".git",
+ ".hg",
+ ".mypy_cache",
+ ".tox",
+ ".venv",
+ "_build",
+ "buck-out",
+ "build",
+ "dist",
+ "migrations",
+]
+
+[tool.black]
+line-length = 79
+include = '\.pyi?$'
+force-exclude = '''
+/(
+    \.git
+  | \.hg
+  | \.mypy_cache
+  | \.tox
+  | \.venv
+  | _build
+  | buck-out
+  | build
+  | dist
+  | migrations
+)/
+'''
+
+[tool.djlint]
+profile = "django"
+max_attribute_length = 0
+blank_line_after_tag = "load, extends, endblock, endwith"
+line_break_after_multiline_tag = true
+format_attribute_template_tags = true
+
+[tool.pytest.ini_options]
+minversion = "6.0"
+DJANGO_SETTINGS_MODULE = "django_conc.settings"
+python_files = [
+    "tests.py",
+    "test_*.py",
+    "*_tests.py",
+]
--- a/templates/registration/login.html
+++ b/templates/registration/login.html
@ -0,0 +1,11 @@
+{% extends "core/pages/index.html" %}
+
+{% load static %}
+
+{% block main %}
+    <form action="" method="post" autocomplete="off" style="display: grid;gap: 1rem;">
+        {% csrf_token %}
+        {{ form.as_p }}
+        <button class="btn btn-primary" type="submit" style="margin-top:1rem;">Login</button>
+    </form>
+{% endblock main %}