I'm trying to allow users to login to my Flask app using their accounts from a separate web service. I can contact the api of this web service and receive a security token. How do I use this token to authenticate users so that they have access to restricted views?
I don't need to save users into my own database. I only want to authenticate them for a session. I believe this can be done using Flask-Security and the @auth_token_required decorator but the documentation is not very detailed and I'm not sure how to implement this.
EDIT:
Here's a code example:
@main.route("/login", methods=["GET", "POST"])
def login():
payload = {"User": "john", "Password": "password123"}
url = "http://webserviceexample/api/login"
headers = {'content-type': 'application/json'})
#login to web service
r = requests.post(url, headers=headers, json=payload)
response = r.json()
if (r.status_code is 200):
token = response['user']['authentication_token']
# allow user into protected view
return render_template("login.html", form=form)
@main.route('/protected')
@auth_token_required
def protected():
return render_template('protected.html')
Hey there Amedrikaner!
It looks like your use-case is simple enough that we can implement this ourselves. In the code below, I'll be storing your token in the users session and checking in a new wrapper. Let's get started by making our own wrapper, I usually just put these in a wrappers.py file but can you can place it where you like.
def require_api_token(func):
@wraps(func)
def check_token(*args, **kwargs):
# Check to see if it's in their session
if 'api_session_token' not in session:
# If it isn't return our access denied message (you can also return a redirect or render_template)
return Response("Access denied")
# Otherwise just send them where they wanted to go
return func(*args, **kwargs)
return check_token
Cool!
Now we've got our wrapper implemented we can just save their token to the session. Super simple. Let's modify your function...
@main.route("/login", methods=["GET", "POST"])
def login():
payload = {"User": "john", "Password": "password123"}
url = "http://webserviceexample/api/login"
headers = {'content-type': 'application/json'})
#login to web service
r = requests.post(url, headers=headers, json=payload)
response = r.json()
if (r.status_code is 200):
token = response['user']['authentication_token']
# Move the import to the top of your file!
from flask import session
# Put it in the session
session['api_session_token'] = token
# allow user into protected view
return render_template("login.html", form=form)
Now you can check the protected views using the @require_api_token wrapper, like this...
@main.route('/super_secret')
@require_api_token
def super_secret():
return "Sssshhh, this is a secret"
EDIT Woah! I forgot to mention you need to set your SECRET_KEY in your apps config.
Just a config.py file with SECRET_KEY="SOME_RANDOM_STRING" will do. Then load it with...
main.config.from_object(config)