def login():
if current_user.is_authenticated:
return redirect(url_for('index'))
form = LoginForm()
form.username(style='color:red')
if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user is None or not user.check_password(form.password.data):
flash("Invalid username or password")
return redirect(url_for('login'))
login_user(user, remember=form.remember_me.data)
next_page = request.args.get('next')
if next_page is None or url_parse(next_page).netloc != '':
next_page = url_for('index')
return redirect((next_page))
return render_template('login.html', form=form, title="Sign In")
