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app.py
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app.py
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# Written by Arpan Neupane on October 30, 2020
# Copyright ©️ Arpan Neupane 2020.
# Refer to the README.md for more information.
from flask import Flask, url_for, render_template, flash, redirect, session, request, jsonify
from flask_sqlalchemy import SQLAlchemy
from flask_wtf import FlaskForm
from wtforms import SubmitField, TextAreaField, StringField, PasswordField, DateTimeField
from wtforms.validators import InputRequired, Length, ValidationError, Email
from flask_login import LoginManager, UserMixin, login_user, login_required, logout_user, current_user
from flask_mail import Mail, Message
import os
from datetime import datetime
from flask_bcrypt import Bcrypt
import datetime
from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
app = Flask(__name__)
db = SQLAlchemy(app)
bcrypt = Bcrypt(app)
app.config['SECRET_KEY'] = '1a83656b61b74d87935a23efa27b819d'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
app.config['MAIL_SERVER'] = 'smtp.gmail.com'
app.config['MAIL_PORT'] = 465
app.config['MAIL_USERNAME'] = os.environ.get("EMAIL_TODO")
app.config['MAIL_PASSWORD'] = os.environ.get("PASSWORD_TODO")
app.config['MAIL_USE_TLS'] = False
app.config['MAIL_USE_SSL'] = True
mail = Mail(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = "login"
@login_manager.user_loader
def load_user(user_id):
return User.query.get(int(user_id))
@app.before_request
def make_session_permanent():
session.permanent = True
class Todo(db.Model):
id = db.Column(db.Integer, primary_key=True)
todo = db.Column(db.String(130), nullable=False)
complete = db.Column(db.Boolean)
todo_time = db.Column(db.DateTime, nullable=False,
default=datetime.datetime.utcnow())
user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
class User(db.Model, UserMixin):
id = db.Column(db.Integer, primary_key=True)
username = db.Column(db.String(15), unique=True)
email = db.Column(db.String(50), unique=True)
password = db.Column(db.String(80))
todo = db.relationship('Todo', backref='writer', lazy=True)
def get_reset_token(self, expires_sec=1800):
s = Serializer(app.config['SECRET_KEY'], expires_sec)
return s.dumps({'user_id': self.id}).decode('utf-8')
@staticmethod
def verify_reset_token(token):
s = Serializer(app.config['SECRET_KEY'])
try:
user_id = s.loads(token)['user_id']
except:
return None
return User.query.get(user_id)
class RegisterForm(FlaskForm):
email = StringField(validators=[InputRequired(), Email(
message="Invalid Email"), Length(max=50)], render_kw={"placeholder": "Email Address"})
username = StringField(validators=[InputRequired(), Length(
min=4, max=15)], render_kw={"placeholder": "Username"})
password = PasswordField("Password", validators=[InputRequired(), Length(
min=4, max=15)], render_kw={"placeholder": "Password"})
def validate_username(self, username):
existing_user_username = User.query.filter_by(
username=username.data).first()
if existing_user_username:
raise ValidationError(
"That username already exists. Please choose a different one.")
def validate_email(self, email):
existing_user_email = User.query.filter_by(email=email.data).first()
if existing_user_email:
raise ValidationError(
"That email address belongs to different user. Please choose a different one.")
class LoginForm(FlaskForm):
username = StringField(validators=[InputRequired(), Length(
min=4, max=15)], render_kw={"placeholder": "Username"})
password = PasswordField("Password", validators=[InputRequired(), Length(
min=4, max=15)], render_kw={"placeholder": "Password"})
submit = SubmitField('Login')
class CreateForm(FlaskForm):
todo = StringField(validators=[InputRequired(), Length(
min=2, max=130)], render_kw={"placeholder": "Enter Todo"})
class EditForm(FlaskForm):
todo = StringField(validators=[InputRequired(), Length(
min=2, max=130)], render_kw={"placeholder": "Edit Todo"})
class ForgotPasswordForm(FlaskForm):
email = StringField(validators=[InputRequired(), Email(
message="Invalid Email"), Length(max=50)], render_kw={"placeholder": "Email Address"})
class ResetPasswordForm(FlaskForm):
email = StringField(validators=[InputRequired(), Email(
message="Invalid Email"), Length(max=50)], render_kw={"placeholder": "Email Address"})
password = PasswordField(validators=[InputRequired(), Length(
min=4, max=15)], render_kw={"placeholder": "New Password"})
class UpdateAccountForm(FlaskForm):
email = StringField(validators=[InputRequired(), Email(
message="Invalid Email"), Length(max=50)], render_kw={"placeholder": "Email"})
username = StringField(validators=[InputRequired(), Length(
min=4, max=15)], render_kw={"placeholder": "Username"})
def validate_username(self, username):
if current_user.username != username.data:
user = User.query.filter_by(username=username.data).first()
if user:
raise ValidationError(
"That username already exists. Please choose a different one.")
def validate_email(self, email):
if current_user.email != email.data:
email = User.query.filter_by(email=email.data).first()
if email:
raise ValidationError(
"That email address belongs to different user. Please choose a different one.")
class ChangePassword(FlaskForm):
email = StringField(validators=[InputRequired(), Email(
message="Invalid Email"), Length(max=50)], render_kw={"placeholder": "Email Address"})
new_password = PasswordField(validators=[InputRequired(), Length(
min=4, max=15)], render_kw={"placeholder": "New Password"})
@app.route('/', methods=['GET', "POST"])
@app.route('/home', methods=['GET', "POST"])
@app.route('/sign-up', methods=['GET', "POST"])
def home():
form = RegisterForm()
if current_user.is_authenticated:
return redirect(url_for('dashboard'))
if form.validate_on_submit():
hashed_password = bcrypt.generate_password_hash(form.password.data)
new_user = User(username=form.username.data,
email=form.email.data, password=hashed_password)
db.session.add(new_user)
db.session.commit()
flash('Your account was successfully created! You are able to login now.')
return redirect(url_for('login'))
return render_template('home.html', form=form)
@app.errorhandler(404)
def page_not_found(e):
return render_template('404.html')
@app.errorhandler(403)
def page_not_found(e):
return render_template('403.html')
@app.errorhandler(500)
def page_not_found(e):
return render_template('500.html')
@app.route('/login', methods=['GET', 'POST'])
def login():
form = LoginForm()
if form.validate_on_submit():
user = User.query.filter_by(username=form.username.data).first()
if user:
if bcrypt.check_password_hash(user.password, form.password.data):
login_user(user)
return redirect('dashboard')
return render_template('login.html', form=form)
@app.route('/logout')
def logout():
logout_user()
flash('You have been logged out.')
return redirect(url_for('login'))
@app.route('/dashboard', methods=['GET', 'POST'])
@login_required
def dashboard():
incomplete_todos = Todo.query.filter_by(
writer=current_user, complete=False).all()
complete_todos = Todo.query.filter_by(
writer=current_user, complete=True).all()
return render_template('dashboard.html', incomplete_todos=incomplete_todos, complete_todos=complete_todos, datetime=datetime.datetime.now())
@app.route('/my-account', methods=['GET', 'POST'])
@login_required
def account():
form = UpdateAccountForm()
if form.validate_on_submit():
current_user.username = form.username.data
current_user.email = form.email.data
db.session.commit()
flash('Your account has been updated!')
return redirect(url_for('account'))
elif request.method == 'GET':
form.username.data = current_user.username
form.email.data = current_user.email
return render_template('account.html', form=form, email=current_user.email, username=current_user.username)
@app.route('/change-password', methods=['GET', 'POST'])
@login_required
def change_password():
form = ChangePassword()
if form.validate_on_submit():
user = User.query.filter_by(email=form.email.data).first()
hashed_password = bcrypt.generate_password_hash(form.new_password.data)
if form.email.data != current_user.email:
flash("Invalid email")
else:
current_user.password = hashed_password
db.session.commit()
flash('Your password has been updated!')
return redirect(url_for('account'))
return render_template('change_password.html', form=form)
@app.route('/new-todo', methods=['GET', 'POST'])
@login_required
def create_todo():
form = CreateForm()
if form.validate_on_submit():
new_todo = Todo(todo=form.todo.data,
writer=current_user, complete=False)
db.session.add(new_todo)
db.session.commit()
return redirect(url_for('dashboard'))
return render_template('create_todo.html', form=form)
@app.route('/delete-todo/<int:todo_id>', methods=['GET', 'POST'])
@login_required
def delete_todo(todo_id):
todo = Todo.query.filter_by(writer=current_user, id=todo_id).first_or_404()
db.session.delete(todo)
db.session.commit()
return redirect(url_for('dashboard'))
@app.route('/complete-todo/<int:todo_id>', methods=['GET', 'POST'])
@login_required
def complete_todo(todo_id):
todo = Todo.query.filter_by(id=todo_id, writer=current_user).first_or_404()
todo.complete = True
db.session.commit()
return redirect(url_for('dashboard'))
@app.route('/edit-todo/<int:todo_id>', methods=['GET', 'POST'])
@login_required
def edit_todo(todo_id):
todo = Todo.query.filter_by(id=todo_id, writer=current_user).first_or_404()
form = EditForm()
if form.validate_on_submit():
todo.todo = form.todo.data
db.session.commit()
return redirect(url_for('dashboard'))
elif request.method == 'GET':
form.todo.data = todo.todo
return render_template('edit_todo.html', form=form)
def send_reset_email(user):
token = user.get_reset_token()
msg = Message('Forgot your password?',
sender='todosapp1490@gmail.com',
recipients=[user.email])
msg.body = f'''To reset your password, visit the following link:
{url_for('reset_password', token=token, _external=True)}
If you did not make this request then simply ignore this email.
'''
mail.send(msg)
# If a user forgets their password
@app.route("/forgot-password", methods=["GET", "POST"])
def forgot_password():
form = ForgotPasswordForm()
if current_user.is_authenticated:
return redirect(url_for('dashboard'))
if form.validate_on_submit():
user = User.query.filter_by(email=form.email.data).first()
send_reset_email(user)
flash('An email has been sent to that email address you provided. If this was an accidental request, you can ignore the email.')
return render_template("forgot_password.html", form=form, title="Forgot Password")
# Reset the Password
@app.route("/reset-password/<token>", methods=["GET", "POST"])
def reset_password(token):
if current_user.is_authenticated:
return redirect(url_for('dashboard'))
user = User.verify_reset_token(token)
if user is None:
flash('That is an invalid or expired token', 'warning')
return redirect(url_for('forgot_password'))
form = ResetPasswordForm()
if form.validate_on_submit():
hashed_password = bcrypt.generate_password_hash(form.password.data)
user.password = hashed_password
db.session.commit()
flash('Your password has been updated! You are now able to log in.', 'success')
return redirect(url_for('login'))
return render_template('reset_password.html', title='Reset Password', form=form)
if __name__ == '__main__':
app.run(debug=True)