This article will cover how to add authentication to your Flask app with the Flask-Login package. Next, update main.py by modifying the import line and the routes for index and profile: Now you will update auth.py by modifying the import line and routes for login and signup: Once you’ve made these changes, here is what the sign-up page looks like if you navigate to /sign-up: You should be able to see the pages for /, /login, and /profile as well. We’ll leave /logout alone for now because it won’t display a template when it’s done. Part of __init__.py file Flask is my favorite Python web framework. Start by adding the UserMixin to your User model. Customers loved it. The final thing we can do is update the logout view. In your application, you may decide you want much more information to be stored per user. Create the function and add a redirect to the bottom.
In this case, the base template will have navigation links and the general layout of the page. Join us and get access to hundreds of tutorials, hands-on video courses, and a community of expert Pythonistas: Real Python Comment Policy: The most useful comments are those written with the goal of learning from or helping out other readers—after reading the whole article and all the earlier comments. We know the user has entered the correct password when both hashed passwords match. Almost there! flask Hope you got idea on Python login and logout Example using Flask and MySQL. This will display the message directly above the form. For our needs, we will be pointing to the project directory. If the user tries to access the profile page without being logged in, they’ll be sent to the login route. You get paid; we donate to tech nonprofits. This is due to the fact that, from one request to the next, a new instance of the User object is created each time, so we need a place to store the information that the user already authenticated. In my case, I only needed a single user, but Flask-login obviously supports many users at once. Then in the profile.html file, update the page to display the name value: Once we go to our profile page, we then see that the user’s name appears. Our app will use four templates: We’ll also have a base template that will have code common to each of the pages. To start, we’ll have to use the request object to get the form data. Here’s what the code for that endpoint looks like: You’ll notice that most of the code is unrelated to authentication, which is just how it should be. A user loader tells Flask-Login how to find a specific user from the ID that is stored in their session cookie. Complaints and insults generally won’t make the cut here. We will revisit them at a later step and update them with desired functionality.
I knew how everything worked and fit together. Let’s start by adding a second function to handle the POST form data. What’s your #1 takeaway or favorite thing you learned? By calling the flash function, we will send a message to the next request, which in this case, is the redirect.
Continue to update auth.py by adding imports and implementing signup_post: Note: Storing passwords in plaintext is considered a poor security practice. Stuck at home? The tutorial, Python login and logout example will show you how to login and logout a user using session in Python 3. This current_user represents the user from the database, and we can access all of the attributes of that user with dot notation. My ability to quickly add this functionality to the site speaks to the rich ecosystem of Flask extensions that exist. Note: If using the Python interpreter is new to you, you can consult the official documentation. It uses the following Flask extensions in creating the forum: Flask-Admin for database management; Flask-Assets for asset management properties: While Flask-login helpfully provides a UserMixin class that provides default implementations of all of these, I just defined everything required like so: Flask-login also requires you to define a “user_loader” function which, given a user ID, returns the associated user object. The UserMixin will add Flask-Login attributes to the model so that Flask-Login will be able to work with it. For example, you need to authenticate when you are accessing your savings account details using netbanking.
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