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login_callbacks.py
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login_callbacks.py
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import flask
import json
import hashlib
from dash.dependencies import Output, Input
from layouts import login_layout, app_layout
def set_login_callbacks(app, _app_route, app_name):
@app.callback(Output('page-content-frame', 'children'),
[Input('page-content-frame', 'id')])
def dynamic_layout(_):
session_cookie = flask.request.cookies.get('auth-session')
if not session_cookie:
# If there's no cookie we need to login.
return login_layout(app_name)
return app_layout(app_name,session_cookie = session_cookie,
dcc_logout_url = '/logout')
# Create a login route
@app.server.route('/login', methods=['POST'])
def route_login():
data = flask.request.form
username = data.get('username')
password = data.get('password')
hashed_password = hashlib.sha224(password.encode('utf-8')).hexdigest()
with open('users.json') as json_file:
users_list = json.load(json_file)
print(users_list)
if not username or not password:
flask.abort(401)
if username not in users_list or users_list[username]!=hashed_password:
flask.abort(401)
# actual implementation should verify the password.
# Recommended to only keep a hash in database and use something like
# bcrypt to encrypt the password and check the hashed results.
# Return a redirect with
rep = flask.redirect(_app_route)
# Here we just store the given username in a cookie.
# Actual session cookies should be signed or use a JWT token.
rep.set_cookie('auth-session', username, max_age=10)
return rep
@app.server.route('/logout', methods=['POST'])
def route_logout():
# Redirect back to the index and remove the session cookie.
rep = flask.redirect(_app_route) #or '/'
rep.set_cookie('auth-session', '', expires=0)
return rep