Pseudo Code for Login Page Module

This document outlines the pseudo code needed to create a login page using a modular approach. The main focus is to design a module that encapsulates the functionality required for user login.

Module Overview

• Module Name: LoginModule
• Purpose: To handle user login functionality including input validation and error handling.

Pseudo Code Structure

1. Module Definition

Define the LoginModule with the necessary components.

MODULE LoginModule

    FUNCTION Initialize
        // Setup any required resources such as database connections, UI components, etc.
        DisplayLoginPage()
    END FUNCTION

2. User Interface

Create a function to display the login page.

    FUNCTION DisplayLoginPage
        PRINT "Welcome to the Login Page"
        PRINT "Please enter your credentials:"
        INPUT username
        INPUT password
        Call ValidateInput(username, password)
    END FUNCTION

3. Input Validation

Create logic to validate user input.

    FUNCTION ValidateInput(username, password)
        IF IsEmpty(username) OR IsEmpty(password) THEN
            PRINT "Error: Username and Password cannot be empty"
            RETURN
        END IF
        Call AuthenticateUser(username, password)
    END FUNCTION

4. User Authentication

Implement user authentication logic.

    FUNCTION AuthenticateUser(username, password)
        userRecord = GetUserFromDatabase(username)

        IF userRecord EXISTS THEN
            IF VerifyPassword(userRecord.password, password) THEN
                Call SuccessfulLogin(userRecord)
            ELSE
                PRINT "Error: Incorrect Password"
            END IF
        ELSE
            PRINT "Error: Username not found"
        END IF
    END FUNCTION

5. Successful Login

Handle successful login processes.

    FUNCTION SuccessfulLogin(userRecord)
        PRINT "Login Successful! Welcome " + userRecord.username
        // Redirect to the user's dashboard or home page
        RedirectToDashboard(userRecord)
    END FUNCTION

6. Utility Functions

Include additional helper functions as needed.

    FUNCTION GetUserFromDatabase(username)
        // Query database to retrieve user record
        RETURN userRecord FROM database WHERE username = username
    END FUNCTION

    FUNCTION VerifyPassword(storedPassword, inputPassword)
        // Compare passwords using a suitable hashing mechanism
        RETURN Hash(inputPassword) = storedPassword
    END FUNCTION

    FUNCTION IsEmpty(value)
        RETURN value == null OR value == ""
    END FUNCTION

Conclusion

This pseudo code provides a modular approach to developing a login page. By encapsulating functionalities within a module, the design promotes maintainability, readability, and separation of concerns. Each function within the module serves a unique purpose contributing to the overall functionality of the login process.