[Python] Login Google API Flask Python

I'm trying to implement Google login using Flask Python. All the keys match in my app and Google API settings. Everywhere I've set localhost with port 5000. It allows me to log in, I confirm it via my phone, but when it should redirect to the main page with the logged-in user, it throws the error shown in image No. 2. IMAGE

from flask import Flask, render_template, request, redirect, url_for, flash
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, UserMixin, login_user, logout_user, login_required, current_user
from werkzeug.security import generate_password_hash, check_password_hash
from flask_dance.contrib.google import make_google_blueprint, google
import os

from flask_dance.contrib.google import make_google_blueprint, google


app = Flask(__name__)
app.secret_key = 'kasjkjk48g48d48s4848df'

# leidžiam naudoti HTTP (tik testavimui)
os.environ["OAUTHLIB_INSECURE_TRANSPORT"] = "1"

# Google OAuth blueprint


google_bp = make_google_blueprint(
client_id="501193612xxxj3de342hp2bg.apps.googleusercontent.com",
client_secret="GOCSPxxxpH28YVhpv_ELbbU",
redirect_url="http://localhost:5000/login/google/authorized", # Patikrinkite, kad šis URL tiksliai atitiktų
scope=["openid", "https://www.googleapis.com/auth/userinfo.email", "https://www.googleapis.com/auth/userinfo.profile"]
)


app.register_blueprint(google_bp, url_prefix="/login")

# PostgreSQL nustatymai
DB_USER = 'xxxx'
DB_PASSWORD = 'xxx'
DB_HOST = '127.0.0.1'
DB_NAME = 'autogptdb'
app.config['SQLALCHEMY_DATABASE_URI'] = f'postgresql://{DB_USER}:{DB_PASSWORD}@{DB_HOST}/{DB_NAME}'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

db = SQLAlchemy(app)

# ✅ Flask-Login setup
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login' # jei vartotojas nėra prisijungęs – redirectins į login

# ✅ Vartotojų modelis
class User(UserMixin, db.Model):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(50), unique=True, nullable=False)
password = db.Column(db.String(200), nullable=True)

# ✅ User loader
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))

# ✅ Sukuria lenteles, jei jų nėra
def create_tables():
with app.app_context():
db.create_all()

@app.route('/')
def home():
return render_template('index.html', user=current_user)

@app.route("/login/google/authorized")
def google_login():
if not google.authorized:
flash("Nepavyko prisijungti per Google.", "danger")
return redirect(url_for("login")) # Nebereikia dar kartą pereiti į Google login.

try:
resp = google.get("/oauth2/v2/userinfo")
if not resp.ok:
flash("Nepavyko gauti informacijos iš Google", "danger")
return redirect(url_for("login"))

user_info = resp.json()
email = user_info.get("email")

if not email:
flash("Google nepateikė el. pašto", "danger")
return redirect(url_for("login"))

user = User.query.filter_by(username=email).first()
if not user:
# Jei nėra vartotojo, sukuriame jį
user = User(username=email, password=None) # Nereikia slaptažodžio, nes prisijungta per Google
db.session.add(user)
db.session.commit()

login_user(user) # Prisijungimas
flash("Prisijungta per Google!", "success")
return redirect(url_for("home")) # Nukreipimas į pagrindinį puslapį

except Exception as e:
flash(f"Klaida: {e}", "danger")
return redirect(url_for("login"))






@app.route('/register', methods=['GET', 'POST'])
def register():
if request.method == 'POST':
username = request.form['username']
password = request.form['password']
confirm_password = request.form['confirm_password']

if password != confirm_password:
flash('Slaptažodžiai nesutampa', 'danger')
return redirect(url_for('register'))

hashed_password = generate_password_hash(password)

if User.query.filter_by(username=username).first():
flash('Vartotojas jau egzistuoja', 'danger')
return redirect(url_for('register'))

new_user = User(username=username, password=hashed_password)
db.session.add(new_user)
db.session.commit()
flash('Registracija sėkminga, prisijunkite', 'success')
return redirect(url_for('login'))

return render_template('register.html')

@app.route('/login', methods=['GET', 'POST'])
def login():
if request.method == 'POST':
username = request.form['username']
password = request.form['password']

user = User.query.filter_by(username=username).first()
if user and check_password_hash(user.password, password):
login_user(user)
flash('Prisijungta sėkmingai', 'success')
return redirect(url_for('home'))
else:
flash('Neteisingi prisijungimo duomenys', 'danger')

return render_template('login.html')

@app.route('/dashboard')
@login_required
def dashboard():
return render_template('dashboard.html')

@app.route('/logout')
@login_required
def logout():
logout_user()
flash('Atsijungta sėkmingai', 'info')
return redirect(url_for('home'))

if __name__ == "__main__":
create_tables()
app.run(host="0.0.0.0", port=5000, debug=True)


Perhaps someone knows the solution? Thank you.

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