Pseudo Code for Login Page and Function Module

Overview

This pseudo code describes the functionality of a login page and illustrates how to refactor the login process into a separate module.

Main Components

1. Login Functionality
2. Module Implementation

1. Login Functionality

Purpose

To authenticate a user via a username and password.

Pseudo Code

FUNCTION main()
    DISPLAY login_page()
    credentials = GET user input from login form
    result = authenticate_user(credentials.username, credentials.password)
    
    IF result is SUCCESS THEN
        DISPLAY welcome_message()
    ELSE
        DISPLAY error_message("Invalid username or password. Please try again.")
    END IF
END FUNCTION

FUNCTION login_page()
    PRINT "Please enter your username and password."
    INPUT username
    INPUT password
    RETURN (username, password)
END FUNCTION

FUNCTION authenticate_user(username, password)
    stored_user = retrieve_user_from_database(username)
    
    IF stored_user is NOT NULL AND stored_user.password == hash(password) THEN
        RETURN SUCCESS
    ELSE
        RETURN FAILURE
    END IF
END FUNCTION

2. Module Implementation

Purpose

To refactor the login functionality into a separate module for better organization and reusability.

Pseudo Code

MODULE AuthModule

    FUNCTION login_page()
        PRINT "Please enter your username and password."
        INPUT username
        INPUT password
        RETURN (username, password)
    END FUNCTION

    FUNCTION authenticate_user(username, password)
        stored_user = retrieve_user_from_database(username)
        
        IF stored_user is NOT NULL AND stored_user.password == hash(password) THEN
            RETURN SUCCESS
        ELSE
            RETURN FAILURE
        END IF
    END FUNCTION

END MODULE

FUNCTION main()
    DISPLAY AuthModule.login_page()
    credentials = GET user input from login form
    result = AuthModule.authenticate_user(credentials.username, credentials.password)
    
    IF result is SUCCESS THEN
        DISPLAY welcome_message()
    ELSE
        DISPLAY error_message("Invalid username or password. Please try again.")
    END IF
END FUNCTION

Summary

• The code defines a main function that handles user interaction and initiates the login process.
• A separate module AuthModule is created to encapsulate the login_page and authenticate_user functions for improved structure and maintainability.
• Utilizing functions enhances code reusability and separation of concerns, making it easier to manage and understand the codebase.

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