A quick reference for those looking to build a simple interface for user login on their Shiny App. Particularly useful for those not looking to pay for the premium ShinyApps login feature.

I do not study cryptography nor can I say that this is a secure authentication procedure.

• Creates a SQLite database for storing information. The 'users' table houses the username and hashed passwords for all registered users.
• User switches between two renderUI() functions depending on the login status.
• If an account does not exist, the user can create an account. The username is stored in plaintext along with the hashed password text using the sha256() function from the openssl library
• If an account exists, the user can login with the corresponding username and password. The loggedIn status of the app changes and the UI changes.
• After logging in, the user can logout by clicking the action-link in the top right.
• A log of actions can be found in the console.

• Password resets
• More detailed user registration form (re-type password, user email)
• Verify password authentication with cryptography standards