Auth error after having the user logged

Hi everyone I am creating this app that for now only allows the user to log in, I am using python Flask for the backend, the thing is that after logging in without errors a redirect link appears like this: http://localhost:3000/#access_token=eyJhb.... and the browser gives me error for page not found, how can I solve it?

supabase: Client = create_client(supabase_url, supabase_key)

@app.route('/')
def home():
    if 'user' in session:
        return redirect('/dashboard')
    return '''
        <a href="/login/github">Login with GitHub</a><br>
        <a href="/login/google">Login with Google</a><br>
        <a href="/login/microsoft">Login with Microsoft</a>
    ''' 
 
@app.route('/login/<provider>')
def login(provider):
    redirect_uri = 'https://mvtnwpifahffpceqsemj.supabase.co/auth/v1/callback'
    auth_url = f"{supabase_url}/auth/v1/authorize?provider={provider}&redirect_to={redirect_uri}"
    logging.info(f"Redirect URL: {auth_url}")
    return redirect(auth_url)
 
@app.route('/callback')
def callback():
    code = request.args.get('code')
    if code:
        try:
            auth_response = supabase.auth.exchange_code_for_session(code)
            user = supabase.auth.user()
            session['user'] = user
            logging.info(f"User info: {user}") 

            user_data = {
                'email': user['email'],
                'name': user['user_metadata']['full_name'],
            }
            return redirect('/dashboard')
        except Exception as e:
            logging.error(f"Error during authentication: {str(e)}")
            return "Authentication failed", 400
    return "Authentication failed", 400
 
@app.route('/dashboard')
def dashboard():
    if 'user' in session:
        return f'Sei loggato, {session["user"]["user_metadata"]["full_name"]}! <a href="/logout">Logout</a>'
    return redirect('/')
 
if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO) 
    app.run(debug=True, port=5000)

supabase: Client = create_client(supabase_url, supabase_key)

@app.route('/')
def home():
    if 'user' in session:
        return redirect('/dashboard')
    return '''
        <a href="/login/github">Login with GitHub</a><br>
        <a href="/login/google">Login with Google</a><br>
        <a href="/login/microsoft">Login with Microsoft</a>
    ''' 
 
@app.route('/login/<provider>')
def login(provider):
    redirect_uri = 'https://mvtnwpifahffpceqsemj.supabase.co/auth/v1/callback'
    auth_url = f"{supabase_url}/auth/v1/authorize?provider={provider}&redirect_to={redirect_uri}"
    logging.info(f"Redirect URL: {auth_url}")
    return redirect(auth_url)
 
@app.route('/callback')
def callback():
    code = request.args.get('code')
    if code:
        try:
            auth_response = supabase.auth.exchange_code_for_session(code)
            user = supabase.auth.user()
            session['user'] = user
            logging.info(f"User info: {user}") 

            user_data = {
                'email': user['email'],
                'name': user['user_metadata']['full_name'],
            }
            return redirect('/dashboard')
        except Exception as e:
            logging.error(f"Error during authentication: {str(e)}")
            return "Authentication failed", 400
    return "Authentication failed", 400
 
@app.route('/dashboard')
def dashboard():
    if 'user' in session:
        return f'Sei loggato, {session["user"]["user_metadata"]["full_name"]}! <a href="/logout">Logout</a>'
    return redirect('/')
 
if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO) 
    app.run(debug=True, port=5000)

supabase: Client = create_client(supabase_url, supabase_key)

@app.route('/')
def home():
    if 'user' in session:
        return redirect('/dashboard')
    return '''
        <a href="/login/github">Login with GitHub</a><br>
        <a href="/login/google">Login with Google</a><br>
        <a href="/login/microsoft">Login with Microsoft</a>
    ''' 
 
@app.route('/login/<provider>')
def login(provider):
    redirect_uri = 'https://mvtnwpifahffpceqsemj.supabase.co/auth/v1/callback'
    auth_url = f"{supabase_url}/auth/v1/authorize?provider={provider}&redirect_to={redirect_uri}"
    logging.info(f"Redirect URL: {auth_url}")
    return redirect(auth_url)
 
@app.route('/callback')
def callback():
    code = request.args.get('code')
    if code:
        try:
            auth_response = supabase.auth.exchange_code_for_session(code)
            user = supabase.auth.user()
            session['user'] = user
            logging.info(f"User info: {user}") 

            user_data = {
                'email': user['email'],
                'name': user['user_metadata']['full_name'],
            }
            return redirect('/dashboard')
        except Exception as e:
            logging.error(f"Error during authentication: {str(e)}")
            return "Authentication failed", 400
    return "Authentication failed", 400
 
@app.route('/dashboard')
def dashboard():
    if 'user' in session:
        return f'Sei loggato, {session["user"]["user_metadata"]["full_name"]}! <a href="/logout">Logout</a>'
    return redirect('/')
 
if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO) 
    app.run(debug=True, port=5000)

supabase: Client = create_client(supabase_url, supabase_key)

@app.route('/')
def home():
    if 'user' in session:
        return redirect('/dashboard')
    return '''
        <a href="/login/github">Login with GitHub</a><br>
        <a href="/login/google">Login with Google</a><br>
        <a href="/login/microsoft">Login with Microsoft</a>
    ''' 
 
@app.route('/login/<provider>')
def login(provider):
    redirect_uri = 'https://mvtnwpifahffpceqsemj.supabase.co/auth/v1/callback'
    auth_url = f"{supabase_url}/auth/v1/authorize?provider={provider}&redirect_to={redirect_uri}"
    logging.info(f"Redirect URL: {auth_url}")
    return redirect(auth_url)
 
@app.route('/callback')
def callback():
    code = request.args.get('code')
    if code:
        try:
            auth_response = supabase.auth.exchange_code_for_session(code)
            user = supabase.auth.user()
            session['user'] = user
            logging.info(f"User info: {user}") 

            user_data = {
                'email': user['email'],
                'name': user['user_metadata']['full_name'],
            }
            return redirect('/dashboard')
        except Exception as e:
            logging.error(f"Error during authentication: {str(e)}")
            return "Authentication failed", 400
    return "Authentication failed", 400
 
@app.route('/dashboard')
def dashboard():
    if 'user' in session:
        return f'Sei loggato, {session["user"]["user_metadata"]["full_name"]}! <a href="/logout">Logout</a>'
    return redirect('/')
 
if __name__ == '__main__':
    logging.basicConfig(level=logging.INFO) 
    app.run(debug=True, port=5000)

silentworks•1/4/25, 2:27 PM

Don't link out to code please unless its a GitHub repo. Provide the code inline here. You can do so using triple back ticks.

Ssilentworks Don't link out to code please unless its a GitHub repo. Provide the code inline ...

soufian01OP•1/4/25, 2:29 PM

i have tryed but it syas that the message is too long

Ssoufian01 i have tryed but it syas that the message is too long

silentworks•1/4/25, 2:30 PM

You only need to paste the relevant parts of your code not your entire codebase

Ssilentworks You only need to paste the relevant parts of your code not your entire codebase

soufian01OP•1/4/25, 2:30 PM

ok done, sorry for the inconvenience

silentworks•1/4/25, 2:31 PM

Why is your login doing all sorts of URL concatenation?

Ssilentworks Why is your login doing all sorts of URL concatenation?

soufian01OP•1/4/25, 2:32 PM

i tought i had to it this way to login by the choosed provider from user

Ssoufian01 i tought i had to it this way to login by the choosed provider from user

silentworks•1/4/25, 2:33 PM

All you have to do is

supabase.auth.sign_in_with_oauth({"provider": provider, { "options": {"redirect_to": ""}}})

supabase.auth.sign_in_with_oauth({"provider": provider, { "options": {"redirect_to": ""}}})

silentworks•1/4/25, 2:33 PM

You can see an example here https://github.com/silentworks/flask-notes/blob/main/app/auth.py#L33-L40

silentworks•1/4/25, 2:34 PM

You can use that entire project as a reference for using Supabase with Flask.

soufian01OP•1/4/25, 2:34 PM

oh wow, that is exactly what i was looking for, thankk you very much i will give it try now

silentworks•1/4/25, 2:36 PM

I haven't updated the project in a while but it works. I need to update it to use the latest supabasesupabase python library.

soufian01OP•1/4/25, 2:55 PM

@app.route('/')
def home():
    if 'user' in session:
        return redirect('/dashboard')
    return '''
        <a href="/login/github">Login with GitHub</a><br>
        <a href="/login/google">Login with Google</a><br>
        <a href="/login/microsoft">Login with Microsoft</a>
    '''  # Pulsanti di login per ogni provider

@app.route('/login/<provider>')
def login(provider):
    resp = supabase.auth.sign_in_with_oauth(
        {
            "provider": provider,
            "options": {"redirect_to": f"{request.host_url}auth/callback"},
        }
    )
    return redirect(resp.url)

@app.route('/callback')
def callback():
    # Gestione del callback dopo il login con il provider (GitHub, Google, Microsoft)
    code = request.args.get('code')
    if code:
        try:

            auth_response = supabase.auth.exchange_code_for_session(code)
            user = supabase.auth.user()

            session['user'] = user
            logging.info(f"User info: {user}")  # Aggiungi log per vedere i dati dell'utente
            return redirect('/dashboard')
        except Exception as e:
            logging.error(f"Error during authentication: {str(e)}") 
            return "Authentication failed", 400
    return "Authentication failed", 400

@app.route('/dashboard')
def dashboard():
    if 'user' in session:
        user = session['user']
        return f"Welcome, {user['email']}!"
    return redirect(url_for('home'))

if __name__ == '__main__':
    app.run(debug=True)

@app.route('/')
def home():
    if 'user' in session:
        return redirect('/dashboard')
    return '''
        <a href="/login/github">Login with GitHub</a><br>
        <a href="/login/google">Login with Google</a><br>
        <a href="/login/microsoft">Login with Microsoft</a>
    '''  # Pulsanti di login per ogni provider

@app.route('/login/<provider>')
def login(provider):
    resp = supabase.auth.sign_in_with_oauth(
        {
            "provider": provider,
            "options": {"redirect_to": f"{request.host_url}auth/callback"},
        }
    )
    return redirect(resp.url)

@app.route('/callback')
def callback():
    # Gestione del callback dopo il login con il provider (GitHub, Google, Microsoft)
    code = request.args.get('code')
    if code:
        try:

            auth_response = supabase.auth.exchange_code_for_session(code)
            user = supabase.auth.user()

            session['user'] = user
            logging.info(f"User info: {user}")  # Aggiungi log per vedere i dati dell'utente
            return redirect('/dashboard')
        except Exception as e:
            logging.error(f"Error during authentication: {str(e)}") 
            return "Authentication failed", 400
    return "Authentication failed", 400

@app.route('/dashboard')
def dashboard():
    if 'user' in session:
        user = session['user']
        return f"Welcome, {user['email']}!"
    return redirect(url_for('home'))

if __name__ == '__main__':
    app.run(debug=True)

this is my code now, but i still got error, idk why i followe the one that you sent me

Ssilentworks I haven't updated the project in a while but it works. I need to update it to us...

soufian01OP•1/4/25, 2:56 PM

oh wow thats nice, thank you very much

soufian01OP•1/4/25, 8:33 PM

@silentworks can you please help me, im really stuck into this idk what to do it's been already 2 days. this is the code i am using now:

supabase: Client = create_client(supabase_url, supabase_key)


@app.route("/")
def home():
    user = session.get("user")
    return render_template("index.html", user=user)

@app.route("/login")
def login():
    redirect_uri = url_for('callback', _external=True)
    response = supabase.auth.sign_in_with_oauth(
        {"provider": "google", "options": {"redirect_to": redirect_uri}}
    )

    return redirect(response.url)


@app.route("/callback")
def callback():

    code = request.args.get("code")
    if code:

        user_session = supabase.auth.get_session()
        print(user_session)
        if user_session:
            user = supabase.auth.get_user()
            session["user"] = user
            return redirect("/user")
    return redirect("/")

@app.route("/user")
def user_page():
    user = session.get("user")
    if not user:
        return redirect("/")
    return f"Welcome, {user['user']['email']}!"

@app.route("/logout")
def logout():
    # Effettua il logout
    session.pop("user", None)
    return redirect("/")

if __name__ == "__main__":
    app.run(debug=True)

supabase: Client = create_client(supabase_url, supabase_key)


@app.route("/")
def home():
    user = session.get("user")
    return render_template("index.html", user=user)

@app.route("/login")
def login():
    redirect_uri = url_for('callback', _external=True)
    response = supabase.auth.sign_in_with_oauth(
        {"provider": "google", "options": {"redirect_to": redirect_uri}}
    )

    return redirect(response.url)


@app.route("/callback")
def callback():

    code = request.args.get("code")
    if code:

        user_session = supabase.auth.get_session()
        print(user_session)
        if user_session:
            user = supabase.auth.get_user()
            session["user"] = user
            return redirect("/user")
    return redirect("/")

@app.route("/user")
def user_page():
    user = session.get("user")
    if not user:
        return redirect("/")
    return f"Welcome, {user['user']['email']}!"

@app.route("/logout")
def logout():
    # Effettua il logout
    session.pop("user", None)
    return redirect("/")

if __name__ == "__main__":
    app.run(debug=True)

thefact is that in the supabase db i can see that the user has been registerd/logged in, but i dont get any session idk why it print None

Ssoufian01 @silentworks can you please help me, im really stuck into this idk what to do it...

silentworks•1/5/25, 12:45 AM

I provided you with an entire project that does all this, you can see the project has a auth/callbackauth/callback route and certain actions happen there, those need to happen in your project also.

Auth error after having the user logged

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