Slide 1
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Title Slide
**Django Authentication**
Slide 2
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**Learning Objectives**
In this tutorial, we will learn to;
- Create login functionality
- Using django built-in login and logout functions
Slide 3
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**System Requirements**
- Ubuntu 16.10
- Python 3.5 or higher version
- python3.4-venv
Slide 4:
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**Introduction**
- Let us use our knowledge of forms and templates to create a login system for our blog application
- We will use Django's built-in authentication system for this.
Demonstration
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**Add a new form**
- We will now add a login form to the ```forms.py``` file located in ```blog``` folder
- Add the following code to the file;
from django.contrib.auth.forms import AuthenticationForm
from django import forms
class LoginForm(AuthenticationForm):
username = forms.CharField(label="Username", max_length=30,
widget=forms.TextInput(attrs={'name': 'username'}))
password = forms.CharField(label="Password", max_length=30,
widget=forms.PasswordInput(attrs={'name': 'password'}))
**explain this in short, any complex concept then can mention will be covered in the upcoming tutorials**
Demonstration
------------------
**Create a new template**
- Create a template ```login.html``` at ```/blog/templates/blog/login.html``` to look like below
**explain this in short, any complex concept then can mention will be covered in the upcoming tutorials**
Demonstration
----------------
**Modify the urls.py**
- Modify the urls.py file located in the ```myproject``` folder
from django.contrib import admin
from django.urls import path, include
from django.contrib.auth import views as auth_views # Add this import
urlpatterns = [
path('admin/', admin.site.urls),
path('blogs/', include('blog.urls', namespace='blog')),
path('login/', auth_views.login, {'template_name': 'blog/login.html',
'authentication_form': LoginForm}, name='login'), # Add this line
]
**explain this**
Demonstration
--------------------
**Modify settings.py**
- Add the following:
LOGIN_REDIRECT_URL = '/blogs/get_blogs/'
**explain this**
Demonstration
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**Modifying the views**
- You will have to add this line ```@login_required(login_url="/login/")``` above all the function in the ```views.py```
- This is called a decorator.
- It is a special function and a built-in feature in django that allows you to verify if the current session of the User is authenticated.
- In case the user is not logged in / authenticated, the user is redirected to the link specified in the variable ```login_url```
- Note: There is a setting for LOGIN_URL available(You may use this instead!)
Example:
# blog/views.py
@login_required(login_url="/login/")
def get_blogs(request):
...
At this point, run the server and show login demo using the super user credentials.
You can visit page ```http://localhost:8000/blogs/get_blogs/``` and show the demo
Demonstration
---------------------
**Add logout url**
- Modify the ```urls.py``` located in
# myproject/urls.py
from django.contrib import admin
from django.urls import path, include
from django.contrib.auth import views as auth_views # Add this import
from blog.forms import LoginForm
urlpatterns = [
path('admin/', admin.site.urls),
path('blogs/', include('blog.urls', namespace='blog')),
path('login/', auth_views.login, {'template_name': 'blog/login.html',
'authentication_form': LoginForm}, name='login'), # Add this line
path('logout/', auth_views.logout, {'next_page': '/login'},
name='logout'), # Add this line
]
Demonstration
---------------------
- Add a link to the ```/logout``` url to the template blogs.html as following:
Logout
At this point, run the server and show logout demo, as well as login and logout demo again in different ways.
For example:
1. We can show http://localhost:8000/blogs/get_blogs/ and it reditrects to login page if user is not authenticated, else we see the blogs
2. We can show http://localhost:8000/login/ and demonstrate login and redirects!
**Concluding and Assignment Slides**