Pseudo Code for a Login Page

Overview

This pseudo code outlines the logic for a basic login functionality, including input validation, authentication, and error handling.

Main Components

1. User Interface
2. Input Validation
3. Authentication
4. Feedback to User
5. Session Management

Pseudo Code

1. User Interface Setup

FUNCTION displayLoginPage()
    DISPLAY "Welcome to the Application"
    DISPLAY "Enter Username:"
    INPUT username
    DISPLAY "Enter Password:"
    INPUT password
    DISPLAY "Submit Button"
END FUNCTION

2. Input Validation

FUNCTION validateInput(username, password)
    IF username IS EMPTY OR password IS EMPTY THEN
        DISPLAY "Error: Username and Password cannot be empty."
        RETURN FALSE
    END IF
    RETURN TRUE
END FUNCTION

3. Authentication

FUNCTION authenticateUser(username, password)
    SET storedUsername TO getStoredUsername(username)
    SET storedPassword TO getStoredPassword(username)

    IF storedUsername IS NULL THEN
        RETURN "Error: User does not exist."
    END IF

    IF password IS EQUAL TO storedPassword THEN
        RETURN "Success"
    ELSE
        RETURN "Error: Incorrect password."
    END IF
END FUNCTION

4. Feedback to User

FUNCTION handleLogin()
    CALL displayLoginPage()
    IF validateInput(username, password) IS TRUE THEN
        SET loginResult TO authenticateUser(username, password)
        IF loginResult IS "Success" THEN
            DISPLAY "Login Successful. Welcome!"
            CALL initializeUserSession(username)
        ELSE
            DISPLAY loginResult
        END IF
    END IF
END FUNCTION

5. Session Management

FUNCTION initializeUserSession(username)
    SET userSession TO createSession(username)
    DISPLAY "User session created."
END FUNCTION

Summary

This pseudo code provides a structured approach to developing a login page functionality, covering user input, validation, authentication, and user feedback. Future developments may expand on multi-factor authentication, password recovery, and integration with user databases.

Additional Considerations

• Security measures such as password hashing should be implemented in a real scenario.
• Consider using HTTPS for secure information transmission.
• This logic may be enhanced with frameworks or libraries as necessary.

For further learning, consider exploring resources available on the Enterprise DNA Platform.