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