• Implemented with Python Flask-SocketIO

• Database using PostgreSQL

• Sentiment Analysis using AYLIEN Text Analysis API

• The emojis :), :(, or :| will be displayed at the end of each message depending on the detected emotion
• The credentials will expire on Jan 28, 2020

• Deployed using Heroku: https://flask-chat-yuan.herokuapp.com/

• app.py: Main application file for the route of the registration and login page as well as the Flask-SocketIO communication with the client

• db.py: Defines the model using Flask-SQLAlchemy for user data

• wtform_fields.py: Defines the registration and login forms as classes using Flask-WTForms and validators for input verification (length, duplicate detection, etc.)

• Procfile: Specifies the commands for Heroku

• requirements.txt: Required python packages

• templates/: HTML files

• main_layout.html: General layout set-up for the forms
• macros.html: Helper template for the forms
• login.htmlL Login page
• index.html: Registration page
• chat.html: Chat page
• 404.html: Not found page

• static/: Javascript and CSS files

• scripts/chat_page.js: Sending messages on keypress
• scripts/socketio.js: SocketIO communication with the server and displaying chat data
• style/style.css: Style for registration, login,and 404 pages
• style/chat_style.css: Style for chat page