Project: Creating Functions to Register App Users

You are a junior developer working in a small start-up. Your managers have asked you to develop a new account registration system for a mobile app. The system must validate user input on the sign-up form before creating an account.

The previous junior developer wrote some helper functions that validate the name, email, and password. Use these functions to register users, store their data, and implement some error handling! These have been imported into the workspace for you. They will be a great help to you when registering the user, but first you have to understand what the function does! Inspect the docstrings of each of the helper functions: validate_name, validate_email and validate_password.

# Re-run this cell and examine the docstring of each function
from python_functions import validate_name, validate_email, validate_password, top_level_domains

print("validate_name\n")
print(validate_name.__doc__)
print("--------------------\n")

print("validate_email\n")
print(validate_email.__doc__) 
print("--------------------\n")

print("validate_password\n")
print(validate_password.__doc__)

# The top level domains variable is used in validate_email to approve only certain email domains
print(top_level_domains)

# Start coding here
# Validate name
def validate_name(name):
    if type(name) != str:
        return False
    elif len(name) < 2:
        return False
    else:
        return True

def validate_email(email):
    # Check if email contains '@'
    if '@' not in email:
        return False
    
    # Split the email into username and domain parts
    parts = email.split('@')
    
    # Check if there are exactly 2 parts (username and domain)
    if len(parts) != 2:
        return False

    username, domain = parts
        
    # Check username length > 1 character
    if len(username) <= 1:
        return False

    # Check if domain ends with any allowed top-level domain
    for tld in top_level_domains:
        if domain.endswith(tld):
            return True
            
    return False

# Validate Password
def validate_password(password):
    return (len(password) > 8 and 
            any(char.isupper() for char in password) and 
            any(char.isdigit() for char in password))

def validate_user(name,email,password):
    # Validate name
    if not validate_name(name):
        raise ValueError("Invalid name. Name must be a string.")
    
    # Validate email
    if not validate_email(email):
        raise ValueError("Invalid email. Must contain '@' and a valid top-level domain.")
    
    # Validate password
    if not validate_password(password):
        raise ValueError("Invalid password. Must be >8 characters, contain a capital letter and a digit.")
    
    # All validations passed
    return True

def register_user(name, email, password):
    try:
        # Call validate_user to check all inputs
        validate_user(name, email, password)
        
        # If validation passes, create and return the user dictionary
        user_data = {
            "name": name,
            "email": email,
            "password": password
        }
        return user_data
        
    except ValueError as e:
        # Catch the ValueError raised by validate_user() and return False
        return False

validate_user('John', '[email protected]', 'securePassword123')