Elektra: Use Case: Authenticate

Elektra 0.8.24

Use Case: Authenticate

## Summary

- Title: Authenticate
- Scope: Authentication
- Level: User Goal
- Actors: Anonymous user
- Brief: Any not logged in user can authenticate to the service.

## Scenarios

- Precondition: Website opened
- Main success scenario: User successfully authenticates against the server. The websites changes its state to authenticated, which enables more features (e.g. creation of snippets).
- Alternative scenario: The authentication was not successful (e.g. wrong credentials). The user is prompted to check his credentials and retry.
- Error scenario: Technical problems prevent the authentication from succeeding (e.g. connection issues). The user is informed about the issue.
- Postcondition: Website is in authenticated state, meaning that all subsequent requests will use the authentication token to identify to the server.
- Non-functional Constraints:
  - Security mechanism
  - Is precondition to use other functions