Basic authentication and Digest authentication with Flask

It's very easy to do with the Flask extension Flask-HTTPAuth.

Installation

$ pip install flask-httpauth

Basic authentication

  1. from flask_httpauth import HTTPBasicAuth
  2. Create a ʻauth instance with ʻauth = HTTPBasicAuth ()
  3. Create a function to check the password: Decorate with @ auth.get_password
  4. Decorate the URL you want to authenticate with @ auth.login_required

app.py


from flask import Flask
from flask_httpauth import HTTPBasicAuth

app = Flask(__name__)
auth = HTTPBasicAuth()

users = {
    "john": "hello",
    "susan": "bye"
}

@auth.get_password
def get_pw(username):
    if username in users:
        return users.get(username)
    return None

@app.route('/')
@auth.login_required
def index():
    return "Hello, %s!" % auth.username()

if __name__ == '__main__':
    app.run()

Digest authentication

MD5 hash the username and password before sending them to the server. Measures against eavesdropping and tampering that could not be prevented by Basic authentication.

Just change HTTPBasicAuth to HTTPDigestAuth.

app.py


from flask import Flask
from flask_httpauth import HTTPDigestAuth

app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret key here'
auth = HTTPDigestAuth()

users = {
    "john": "hello",
    "susan": "bye"
}

@auth.get_password
def get_pw(username):
    if username in users:
        return users.get(username)
    return None

@app.route('/')
@auth.login_required
def index():
    return "Hello, %s!" % auth.username()

if __name__ == '__main__':
    app.run()

ToDo: Find out about pathlib, ʻits dangerous`

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