The app allows a user to log in or register and check the weather for a chosen city. To do so it utilises:
-FastApi - returning prepared HTML templates with Jinja2Templates
-PostgreSQL - storing user data (login, hashed password, last visited city), accessed using SQLAlchemy ORM with Psycopg2 driver
-Redis - storing token (key) and username (value) for logged users
The app is wrapped in Docker-Compose, using official docker images for postgreSQL and redis and building a custom container image for the backend, specified in Dockerfile.
-Log In - If the login and password (read with OAuth2PasswordRequestForm, verified using PassLib CryptContext) is found in postgreSQL database using SQLAlchemy ORM session , a token is created and entered into a redis database, with 1h expiry time, along with the user's username. Then, the token is set as a cookie and the user is redirected to the /weather endpoint where the weather for the last checked city is displayed
-Register - If the entered login is not found in postgreSQL database, a new user is created and the user is logged in analogically with Poznań used as a default city. The password is hashed using PassLib CryptContext before insertion to the postgreSQL database
-Check Weather - A logged user can access the /weather endpoint to display the weather, temperature, humidity and pressure for a chosen city. Data is fetched using an OpenWeatherMap API (http://api.openweathermap.org). The user can change the city using a form on the HTML page
-Log Out - Upon clicking the button, user's cookie token is deleted and the user is redirected to the root page (Index.html).