Python-сообщество

 #!/usr/bin/env python3
from datetime import timedelta
from flask import Flask, session, render_template, redirect, url_for
from wtforms import StringField, PasswordField, SubmitField
from wtforms.validators import DataRequired
from flask_wtf import FlaskForm
from flask_login import LoginManager, UserMixin, current_user, login_user, logout_user, login_required
app = Flask(__name__)
app.secret_key = "+4Qdz8s57TJP8eLxi5rV5+aBFh601WilSZQoWzZJEIEpu39nlWbjgA=="
app.permanent_session_lifetime = timedelta(minutes=60*24)
# Login manager init.
login_manager = LoginManager()
login_manager.init_app(app)
class User(UserMixin):
    pass
valid_creds = {
    "p1": {
        "password": "123"
        },
    "p2": {
        "password": "000"
        }
}
@login_manager.user_loader
def user_loader(login):
    if login != "user":
        return
    user = User()
    user.id = login
    return user
@login_manager.unauthorized_handler
def unauthorized_callback():
    return redirect(url_for("login"))
class LoginForm(FlaskForm):
    login = StringField(label="Имя пользователя:", validators=[DataRequired()])
    password = PasswordField(label="Пароль:", validators=[DataRequired()])
    submit = SubmitField(label="Submit") 
     
@app.route("/")
@login_required
def index():
    print(f"User: {current_user.id}, authentication: {current_user.is_authenticated}")
    return render_template("index.html")
@app.route("/login", methods=["GET", "POST"])
def login():
    # If a user already logged in, route to login must not be available.
    if current_user.is_authenticated:
        return redirect(url_for("index"))
    form = LoginForm()
    if form.is_submitted() and form.validate():
        login = form.login.data
        password = form.password.data
        if login in valid_creds:
            if password == valid_creds[login]["password"]:
                user = User()
                user.id = login
                login_user(user, remember=True)
                
                return render_template("index.html")
            else:
                form.password.errors.append("Неверный пароль")
        else:
            form.login.errors.append("Такого пользователя не существует")
    return render_template("login.html", form=form)
@app.route("/restricted")
@login_required
def restricted():
    return render_template("restricted.html")
@app.route("/logout", methods=["GET", "POST"])
@login_required
def logout():
    logout_user()
    return redirect(url_for("login"))