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Flask Simple Login - Login Extension for Flask

Project Description
|Travis| |PyPI| |PyPI| |PyPI| |Flask|

Login Extension for Flask
=========================

There are good and recommended options to deal with web authentication
in Flask.

**I recommend you use:**

- `Flask-Login <https://flask-login.readthedocs.io>`__
- `Flask-Security <https://pythonhosted.org/Flask-Security/>`__

Those extensions are really complete and **production ready**!

So why **Flask Simple Login**?

However sometimes you need something **simple** for that small project
or for prototyping.

Flask Simple Login
------------------

What it provides:

- Login and Logout forms and pages
- Function to check if user is logged-in
- Decorator for views
- Easy and customizable ``login_checker``

What it does not provide: (but of course you can easily implement by
your own)

- [STRIKEOUT:Database Integration]
- [STRIKEOUT:Password management]
- [STRIKEOUT:API authentication]
- [STRIKEOUT:Role or user based access control]

Hot it works
------------

First install it from
`PyPI <https://pypi.org/project/flask_simplelogin/>`__.

``pip install flask_simplelogin``

.. code:: python

from flask import Flask
from flask_simplelogin import SimpleLogin

app = Flask(__name__)
SimpleLogin(app)

That's it! now you have ``/login`` and ``/logout`` routes in your
application.

The username defaults to ``admin`` and the password defaults to
``secret`` (yeah that's not clever, let's see how to change it)

Configuring
-----------

Simple way

.. code:: python

from flask import Flask
from flask_simplelogin import SimpleLogin

app = Flask(__name__)
app.config['SECRET_KEY'] = 'something-secret'
app.config['SIMPLELOGIN_USERNAME'] = 'chuck'
app.config['SIMPLELOGIN_PASSWORD'] = 'norris'

SimpleLogin(app)

That works, but is not so clever, lets use env vars.

.. code:: bash

$ export SIMPLELOGIN_USERNAME=chuck
$ export SIMPLELOGIN_PASSWORD=norris

then ``SimpleLogin`` will read those env vars automatically.

.. code:: python

from flask import Flask
from flask_simplelogin import SimpleLogin

app = Flask(__name__)
app.config['SECRET_KEY'] = 'something-secret'
SimpleLogin(app)

But what if you have more users and more complex auth logic? **write a
custom login checker**

Using a custom login checker
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code:: python

from flask import Flask
from flask_simplelogin import SimpleLogin

app = Flask(__name__)
app.config['SECRET_KEY'] = 'something-secret'


def only_chuck_norris_can_login(user):
"user = {'username': 'foo', 'password': 'bar'}"
# do the authentication here, it is up to you!
# query your database, check your user/passwd file
# connect to external service.. anything.
is user.get('username') == 'chuck' and user.get('password') == 'norris':
return True # Allowed
return False # Denied


SimpleLogin(app, login_checker=only_chuck_norris_can_login)

Checking if user is logged in
-----------------------------

.. code:: python


from flask_simplelogin import is_logged_in

if is_logged_in():
# do things if anyone is logged in

if is_logged_in('admin'):
# do things only if admin is logged in

Decorating your views
---------------------

.. code:: python

from flask_simplelogin import login_required

@app.route('/it_is_protected')
@login_required # < --- simple decorator
def foo():
return 'secret'

Protecting Flask Admin views
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code:: python


from flask_admin.contrib.foo import ModelView
from flask_simplelogin import is_logged_in


class AdminView(ModelView)
def is_accessible(self):
return is_logged_in('admin')

Customizing templates
---------------------

There are only one template to customize and it is called ``login.html``

Example is:

.. code:: html

{% extends 'base.html' %}
{% block title %}Login{% endblock %}
{% block messages %}
{{super()}}
{%if form.errors %}
<ul class="alert alert-danger">
{% for field, errors in form.errors.items() %}
<li>{{field}} {% for error in errors %}{{ error }}{% endfor %}</li>
{% endfor %}
</ul>
{% endif %}
{% endblock %}

{% block page_body %}
<form action="{{ url_for('simplelogin.login', next=request.args.get('next', '/')) }}" method="post">
<div class="form-group">
{{ form.csrf_token }}
{{form.username.label}}<div class="form-control">{{ form.username }}</div><br>
{{form.password.label}}<div class="form-control"> {{ form.password }}</div><br>
</form>
<input type="submit" value="Send">
</form>
{% endblock %}

Take a look at the `example
app <https://github.com/rochacbruno/flask_simplelogin/blob/master/example/app.py>`__.

And you can customize it in anyway you want and need, it receives a
``form`` in context and it is a ``WTF form`` the submit should be done
to ``request.path`` which is the same ``/login`` view.

You can also use ``{% if is_logged_in %}`` in your template if needed.

Requirements
------------

- Flask-WTF and WTForms
- having a ``SECRET_KEY`` set in your ``app.config``

.. |Travis| image:: https://img.shields.io/travis/rochacbruno/flask_simplelogin.svg?style=flat-square
:target: https://travis-ci.org/rochacbruno/flask_simplelogin
.. |PyPI| image:: https://img.shields.io/pypi/v/flask_simplelogin.svg?style=flat-square
:target: https://pypi.org/project/flask_simplelogin/
.. |PyPI| image:: https://img.shields.io/pypi/pyversions/flask_simplelogin.svg?style=flat-square
:target:
.. |PyPI| image:: https://img.shields.io/pypi/format/flask_simplelogin.svg?style=flat-square
:target:
.. |Flask| image:: https://img.shields.io/badge/Flask-Extension-blue.svg?style=flat-square
:target:
Release History

Release History

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0.0.6

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0.0.2

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0.0.1

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0.0.0

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