115 lines
3.0 KiB
Python
115 lines
3.0 KiB
Python
#!/usr/bin/python3
|
|
"""
|
|
Authentification module
|
|
"""
|
|
import functools
|
|
from typing import Optional
|
|
|
|
from flask import (Blueprint, flash, g, redirect, render_template,
|
|
request, session, url_for, current_app)
|
|
|
|
from werkzeug.security import check_password_hash, generate_password_hash
|
|
|
|
from .db import get_db
|
|
|
|
bp = Blueprint("auth", __name__, url_prefix="/auth")
|
|
|
|
|
|
def login_required(view):
|
|
"""View decorator that redirects anonymous users to the login page."""
|
|
|
|
@functools.wraps(view)
|
|
def wrapped_view(**kwargs):
|
|
if g.user is None:
|
|
flash("You need to login to access this resource.")
|
|
return redirect(url_for("app.auth.login"))
|
|
|
|
return view(**kwargs)
|
|
|
|
return wrapped_view
|
|
|
|
def anon_required(view):
|
|
"""View decorator that redirects authenticated users to the index."""
|
|
|
|
@functools.wraps(view)
|
|
def wrapped_view(**kwargs):
|
|
if g.user is not None:
|
|
return redirect(url_for("app.index"))
|
|
|
|
return view(**kwargs)
|
|
|
|
return wrapped_view
|
|
|
|
|
|
@bp.before_app_request
|
|
def load_logged_in_user():
|
|
"""If a user id is stored in the session, load the user object from
|
|
the database into ``g.user``."""
|
|
user_id = session.get("user_id")
|
|
|
|
if user_id is None:
|
|
g.user = None
|
|
else:
|
|
g.user = (
|
|
get_db().execute("SELECT * FROM user WHERE id = ?", (user_id,)).fetchone()
|
|
)
|
|
|
|
|
|
def create_user(username: str, password: str) -> Optional[str]:
|
|
"""Adds a new user to the database"""
|
|
error = None
|
|
if not username:
|
|
error = "Missing username."
|
|
elif not password:
|
|
error = "Missing password."
|
|
|
|
try:
|
|
db = get_db()
|
|
|
|
db.execute(
|
|
"INSERT INTO user (username, password) VALUES (?, ?)",
|
|
(username, generate_password_hash(password)),
|
|
)
|
|
db.commit()
|
|
except db.IntegrityError:
|
|
# The username was already taken, which caused the
|
|
# commit to fail. Show a validation error.
|
|
error = f"Username {username} is not available."
|
|
|
|
return error # may be None
|
|
|
|
|
|
|
|
@bp.route("/login", methods=("GET", "POST"))
|
|
@anon_required
|
|
def login():
|
|
"""Log in a registered user by adding the user id to the session."""
|
|
if request.method == "POST":
|
|
username = request.form["username"]
|
|
password = request.form["password"]
|
|
db = get_db()
|
|
error = None
|
|
user = db.execute(
|
|
"SELECT * FROM user WHERE username = ?", (username,)
|
|
).fetchone()
|
|
|
|
if (user is None) or not check_password_hash(user["password"], password):
|
|
error = "Incorrect username or password"
|
|
|
|
if error is None:
|
|
# store the user id in a new session and return to the index
|
|
session.clear()
|
|
session["user_id"] = user["id"]
|
|
|
|
return redirect(url_for("app.index"))
|
|
|
|
flash(error)
|
|
|
|
return render_template("login.html")
|
|
|
|
|
|
@bp.route("/logout")
|
|
def logout():
|
|
"""Clear the current session, including the stored user id."""
|
|
session.clear()
|
|
return redirect("/") |