I am currently in the process of building a flask based LAN chatting app (using sqlite3 to store usernames and socketio for messaging) and am having trouble implementing sessions correctly.
I have followed both this guide: https://www.techwithtim.net/tutorials/flask/sessions/ and read the documentation here https://flask-session.readthedocs.io/en/latest/ but am somehow still not getting my code to work:
In the login page, when the username is posted, I want users to be redirected to the chat-page.html, but this does not occur. Instead they are redirected to the login page, and I cannot figure out why:
from flask import Flask, render_template, request, flash, session, redirect, url_for
#creating the routes
@app.route('/login', methods=["POST", "GET"])
def login_form():
if request.method == "POST":
username = request.form.get("user_name")
session["user"] = username
return redirect(url_for('chat_page'))
else:
if "user" in session:
return redirect(url_for('chat_page'))
return render_template('login.html')
@app.route('/chat-page')
def chat_page():
if "user" in session:
username = session["user"]
return render_template('chat-page.html', Uname=username)
return redirect(url_for('login_form'))
@app.route("/logout")
def logout():
session.pop("user", None)
flash("You have been logged out!")
return redirect(url_for('login_form'))
from flask_session import Session
app = Flask(__name__)
Session(app)
When I tried to debug your code, I ran into issues with the secret key. I don't know how or where you set it or call your app, but here is my complete code that worked. They key might be to set app.config['SESSION_TYPE'] = 'filesystem'
. I used this answer to solve it.
from flask import Flask, render_template, request, flash, session, redirect, url_for
from flask_session import Session
app = Flask(__name__)
app.config['SESSION_TYPE'] = 'filesystem'
app.config['SECRET_KEY'] = 'secret key'
Session(app)
# creating the routes
@app.route('/login', methods=["POST", "GET"])
def login_form():
if request.method == "POST":
username = request.form.get("user_name")
session["user"] = username
return redirect(url_for('chat_page'))
else:
if "user" in session:
return redirect(url_for('chat_page'))
return render_template('login.html')
@app.route('/chat-page')
def chat_page():
if "user" in session:
return '<div>chat page!</div>'
return redirect(url_for('login_form'))
@app.route("/logout")
def logout():
session.pop("user", None)
flash("You have been logged out!")
return redirect(url_for('login_form'))
app.run(debug=True)
What I'm saying is, your redirect logic is completely fine. The issue must be with the session.
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