app.py

from flask import Flask, render_template, redirect, url_for, request, flash
from werkzeug.security import generate_password_hash, check_password_hash
from flask_sqlalchemy import SQLAlchemy
from flask_login import login_user, logout_user, login_required, LoginManager, current_user, UserMixin


db = SQLAlchemy()

app = Flask(__name__)

app.config['SECRET_KEY'] = '9OLWxND4o83j4K4iuopO'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.sqlite'

db.init_app(app)

login_manager = LoginManager()
login_manager.login_view = 'login'
login_manager.init_app(app)

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(100), unique=True)
    password = db.Column(db.String(100))
    name = db.Column(db.String(1000))

@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

@app.route("/")
@app.route("/index")
def home():
    return render_template('index.html')

@app.route("/train")
def train():
	return render_template('train.html', title='Train Now')

@app.route("/login")
def login():
	return render_template('login.html', title='Login')

@app.route("/login", methods=['POST'])
def login_post():
    email = request.form.get('email')
    password = request.form.get('password')
    remember = True if request.form.get('remember') else False

    user = User.query.filter_by(email=email).first()

    if not user or not check_password_hash(user.password, password): 
        flash('Please check your login details and try again.')
        return redirect(url_for('login'))
    login_user(user, remember=remember)
    return redirect(url_for('home'))


@app.route("/signup")
def signup():
	return render_template('signup.html', title='Signup')

@app.route("/signup", methods=['POST'])
def signup_post():

    email = request.form.get('email')
    name = request.form.get('name')
    password = request.form.get('password')

    user = User.query.filter_by(email=email).first()

    if user:  
        flash('Email address already exists')
        return redirect(url_for('login'))

    new_user = User(email=email, name=name, password=generate_password_hash(password, method='sha256'))

    db.session.add(new_user)
    db.session.commit()

    return redirect(url_for('login'))

@app.route('/logout')
@login_required
def logout():
    logout_user()
    return redirect(url_for('home'))

if __name__ == "__main__":
    app.run()