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cau-praktikum/app/routes/auth.py
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Python

from flask import Blueprint, render_template, request, redirect, url_for, session, flash
from flask_login import login_user
from app.db import get_db
from werkzeug.security import generate_password_hash, check_password_hash
from app.models.user import User
auth_bp = Blueprint("auth", __name__)
@auth_bp.route("/login", methods=["GET", "POST"])
def login():
if request.method == "POST":
username = request.form["username"]
password = request.form["password"]
db = get_db()
row = db.execute(
"SELECT * FROM users WHERE username = ?",
(username,)
).fetchone()
if row and check_password_hash(row["password_hash"], password):
user = User(id=row["id"], username=row["username"])
login_user(user)
return redirect(url_for("main.home"))
else:
flash("Invalid username or password")
return render_template("login.html")
@auth_bp.route("/register", methods=["GET", "POST"])
def register():
if request.method == "POST":
username = request.form.get("username")
password = request.form.get("password")
if not username or not password:
flash("Please fill out all fields")
return render_template("register.html")
db = get_db()
existing_user = db.execute(
"SELECT id FROM users WHERE username = ?",
(username,)
).fetchone()
if existing_user:
flash("Username already taken")
return render_template("register.html")
hashed_password = generate_password_hash(password)
db.execute(
"INSERT INTO users (username, password_hash) VALUES (?, ?)",
(username, hashed_password)
)
db.commit()
flash("Account created! Please log in.")
return redirect(url_for("auth.login"))
return render_template("register.html")