Flask authentication with Flask-Security

Question

Trying to enable login in flask with flask-security. The following code works fine (I import in __init__.py)

from flask import Blueprint, render_template, request, redirect, url_for
from coursly import app
from coursly.models import *
from flask.ext.security import Security, LoginForm, SQLAlchemyUserDatastore

user_datastore = SQLAlchemyUserDatastore(db, user.User, user.Role)
Security(app, user_datastore)

user = Blueprint('user', __name__)

@user.route('/')
def index():
    return redirect(url_for("user.login"))

@user.route('/login', methods=['GET', 'POST'])
def login():
    return render_template('user/login.html', content='Login Page', action=url_for('auth.authenticate'), form=LoginForm())

If, however, I change user = Blueprint('user', __name__) to user = Blueprint('user', __name__, url_prefix='/blah') it fails with a werkzeug.routing.BuildError BuildError: ('auth.authenticate', {}, None). url_for is the problem, however, I don't understand why. HALP!

alexenko · Accepted Answer · 2012-12-26 17:12:35Z

9

Figured it out. Turns out Flask-security already has /login /logout built in and my login function was largely ignored. It wasn't used during normal app execution. Except url_for was still processed hence the BuildError.

I was trying to use an outdated example from https://github.com/dracule/FlaskBootstrapSecurity and it was a fail. Flask-Security was updated 3 mo ago. The action param should be updated to action=url_for('security.login') and it will work.

TL;DR adding a url_prefix will not use Flask-Security's built in /login /logout and a lot of vars were renamed

answered Dec 26, 2012 at 17:12

alexenko

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1 Comment

exhuma Over a year ago

You should accept your answer, even if it's your own. That way it's properly shown as "answered" here on SO.

prietosanti · Accepted Answer · 2020-03-06 15:23:07Z

1

I know this is an old question but just in case someone has this problem as I had, here's the related documentation

answered Mar 6, 2020 at 15:23

prietosanti

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