showAuth()
Launches the Auth Modal when no valid access token is available.
logout(redirectUrl)
Logs out a user by removing the authenticated user token from localStorage and redirects the user (optional).
getUserId()
Retreives a user's id when authenticated. If no auth token exists or if it's invalid, the return value will be null.
getUserToken()
Retreives a user's token when one exists.
isAuthenticated()
Checks whether a user is authenticated, which means that they have a token and that the token is not expired.
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