Flask and Auth0 - How to check if user is authenticated in Jinja - flask

Question

I'm using Auth0 for authentication in my Flask application, and wondering how to check if the user is authenticated in the Jinja template.
I'm wondering if there's a way to do something similar to how LoginManager does it:
{% if current_user.is_anonymous %} #<-- This here
<li>Login</li>
{% else %}
<li>Profile</li>
<li>Logout</li>
{% endif %}

Answer 1

you have two options:
using the global g object which is automatically available in templates with the before_app_request hook, read more on the official Flask tutorial:
#bp.before_app_request
def load_logged_in_user():
"""If a user id is stored in the session, load the user object from
the database into ``g.user``."""
user_id = session.get("user_id")
if user_id is None:
g.user = None
else:
g.user = (
get_db().execute("SELECT * FROM user WHERE id = ?", (user_id,)).fetchone()
)
and then in your template :
{% if g.user %}
<li><span>{{ g.user['username'] }}</span>
<li>Log Out
{% else %}
<li>Register
<li>Log In
{% endif %}
inject your current_user object to the context processor, flask-login is your good inspiration (without decorator) :
[..]
def _get_user():
if has_request_context() and not hasattr(_request_ctx_stack.top, 'user'):
current_app.login_manager._load_user()
return getattr(_request_ctx_stack.top, 'user', None)
[..]
def _user_context_processor():
return dict(current_user=_get_user())
and then get the current app (maybe you'll need to import current_app object in your case)
[..]
app.context_processor(_user_context_processor)
then you can use the current_user like :
{% if current_user.is_anonymous %} #<-- This here
<li>Login</li>
{% else %}
<li>Profile</li>
<li>Logout</li>
{% endif %}