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Business Requirements

Business requirements for the Let's Stream It project are described using use case diagrams and a textual description.

User Login/Registration​

User Login/Registration

A user who accesses the system must be able to:

  1. Register a new account (Sign Up)
    • Actor: User
    • Preconditions: The user is not registered in the system.
    • Postconditions: The user is registered in the system.
    • Main Success Scenario
      1. The user accesses the registration page.
      2. The user fills in the registration form.
      3. The user submits the registration form.
      4. The system validates the registration form.
      5. The system registers the user.
      6. The system redirects the user to the login page.
    • Extensions
      • A1: The user submits an invalid registration form.
        1. The system displays an error message.
        2. The user returns to step 2 and corrects the form.
      • A2: The user submits a registration form with an existing email.
        1. The system displays an error message.
        2. The user returns to step 2 and enters a different email.
  2. Login
    • Actor: User
    • Preconditions: The user is registered in the system.
    • Postconditions: The user is authenticated in the system.
    • Main Success Scenario
      1. The user accesses the login page.
      2. The user fills in the login form.
      3. The user submits the login form.
      4. The system validates the login form.
      5. The system authenticates the user.
      6. The system redirects the user to the home page.
    • Extensions
      • A1: The user submits a login form with incorrect credentials.
        1. The system displays an error message.
        2. The user returns to step 2 and enters the correct credentials.

Authenticated User​

After the user is authenticated, it can perform numerous actions such as:

  • Logout
  • Modify its profile
  • Create a new Session
  • Join an existing Session
  • Look at a user's profile

Authenticated User

  1. Logout

    • Actor: Authenticated User
    • Preconditions: The user is authenticated in the system.
    • Postconditions: The user is not authenticated in the system.
    • Main Success Scenario
      1. The user accesses the logout page.
      2. The user clicks on the logout button.
      3. The system logs out the user.
      4. The system redirects the user to the login page.

  2. Modify Profile

    • Actor: Authenticated User
    • Preconditions: The user is authenticated in the system.
    • Postconditions: The user's profile is updated.
    • Main Success Scenario
      1. The user accesses the profile page.
      2. The user fills in the profile form.
      3. The user submits the profile form.
      4. The system validates the profile form.
      5. The system updates the user's profile.
    • Extensions
      • A1: The user submits an invalid profile form.
        1. The system displays an error message.
        2. The user returns to step 2 and corrects the form.

  3. Create Session

    • Actor: Authenticated User
    • Preconditions: The user is authenticated in the system.
    • Postconditions: Session is created.
    • Main Success Scenario
      1. The user accesses the Create Session popup.
      2. The user fills in the Session form.
      3. The user submits the Session form.
      4. The system validates the Session form.
      5. The system creates the Session.
      6. The system redirects the user to the Session page, directly joining him to the Session.
    • Extensions
      • A1: The user is already joined in a Session.
        1. The system displays an error message.
        2. The user goes back to the home page.
      • A2: The user submits an invalid Session form.
        1. The system displays an error message.
        2. The user returns to step 2 and corrects the form.
      • A3: The user token is not valid.
        1. The system displays an error message.
        2. The user returns to step 2 and corrects the form.

  4. Join Session

    • Actor: Authenticated User
    • Preconditions:
      1. The user is authenticated in the system.
      2. The specified Session has been previously created.
    • Postconditions: The user is in the Session.
    • Main Success Scenario
      1. The user accesses the Session page by specifying its Id in the URL.
      2. The system validates the Session URL.
      3. The system adds the user to the Session.
      4. The system updates the page with current Session information.
    • Extensions
      • A1: The user is already joined in a Session.
        1. The system displays an error message.
        2. The user goes back to the home page.
      • A2: The user accesses an invalid Session URL.
        1. The system displays an error message.
        2. The user goes back to the home page.
      • A3: The user token is not valid.
        1. The system displays an error message.
        2. The user goes back to the home page.

  5. Look at a User's Profile

    • Actor: Authenticated User
    • Preconditions: The user is authenticated in the system.
    • Postconditions: The user is looking at a user's profile.
    • Main Success Scenario
      1. The user accesses a user's profile page.
      2. The system displays the user's profile.
    • Extensions
      • A1: The user accesses an invalid user's profile.
        1. The system displays an error message.
        2. The user goes back to the home page.
      • A3: The user accesses a non-existing user's profile.
        1. The system displays an error message.
        2. The user goes back to the home page.

User in a Session​

When the user is in a Session, it can perform actions such as:

  • Leave the Session
  • Send a message
  • Play the video
  • Pause the video
  • Move the video to a specific time

User in a Session

  1. Leave Session

    • Actor: User in a Session
    • Preconditions: The user is joined in a Session.
    • Postconditions: The user is disconnected from the Session.
    • Main Success Scenario
      1. The user navigates to another Let's Stream It page or closes the Session tab.
      2. The system automatically removes the user from the Session.
      3. The system redirects the user to the requested page.

  2. Send Message

    • Actor: User in a Session
    • Preconditions: The user is in a Session.
    • Postconditions: Message is sent.
    • Main Success Scenario
      1. The user fills in the message form.
      2. The user submits the message form.
      3. The system sends the message to the Session.
      4. The system displays the message in the Session.

  3. Play Video

    • Actor: User in a Session
    • Preconditions: The user is joined in a Session.
    • Postconditions: Video is playing.
    • Main Success Scenario
      1. The user clicks on the play button.
      2. The system plays the Session video.

  4. Pause Video

    • Actor: User in a Session
    • Preconditions: The user is joined in a Session.
    • Postconditions: Video is paused.
    • Main Success Scenario
      1. The user clicks on the pause button.
      2. The system pauses the Session video.

  5. Move Video to a Specific Time

    • Actor: User in a Session
    • Preconditions: The user is joined in a Session.
    • Postconditions: Video is moved to a specific time.
    • Main Success Scenario
      1. The user fills in the time form.
      2. The user submits the time form.
      3. The system moves the Session video to a specific time.