forms.py

from flask_wtf import FlaskForm
from wtforms import StringField, PasswordField, SubmitField
from wtforms.validators import DataRequired, Email, EqualTo, Length, ValidationError
from models import User

class LoginForm(FlaskForm):
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Пароль', validators=[DataRequired()])
    submit = SubmitField('Войти')

class RegistrationForm(FlaskForm):
    username = StringField('Имя пользователя', validators=[DataRequired(), Length(min=4, max=25)])
    email = StringField('Email', validators=[DataRequired(), Email()])
    password = PasswordField('Пароль', validators=[DataRequired(), Length(min=6)])
    confirm_password = PasswordField('Подтвердите пароль',
                                   validators=[DataRequired(), EqualTo('password')])
    submit = SubmitField('Зарегистрироваться')

    def validate_email(self, email):
        user = User.query.filter_by(email=email.data).first()
        if user:
            raise ValidationError('Этот email уже используется')