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A custom exception class for handling authentication-related errors in an application.

Purpose

AuthError is a specialized exception class that extends Python's built-in Exception class. It is designed to be raised when authentication failures occur, such as invalid credentials, expired tokens, unauthorized access attempts, or other authentication-related issues. By using a custom exception, code can distinguish authentication errors from other types of exceptions and handle them specifically.

Source Code

class AuthError(Exception):
    """Authentication error"""
    def __init__(self, msg):
        super(AuthError, self).__init__(msg)

Parameters

Parameter Details

msg: A string message describing the authentication error that occurred. This message will be displayed when the exception is raised and can provide context about why authentication failed (e.g., 'Invalid credentials', 'Token expired', 'Unauthorized access').

Return Value

Instantiation returns an AuthError exception object that inherits from Exception. This object can be raised using the 'raise' keyword and caught using try-except blocks. The exception carries the error message provided during instantiation.

Class Interface

Methods

Attributes

Usage Example

# Raising the exception
try:
    user_authenticated = False
    if not user_authenticated:
        raise AuthError('User authentication failed: Invalid credentials')
except AuthError as e:
    print(f'Authentication error occurred: {e}')

# Using in a function
def authenticate_user(username, password):
    if not username or not password:
        raise AuthError('Username and password are required')
    if password != 'correct_password':
        raise AuthError('Invalid password provided')
    return True

# Catching specific authentication errors
try:
    authenticate_user('john', 'wrong_pass')
except AuthError as auth_err:
    print(f'Auth failed: {auth_err}')
except Exception as e:
    print(f'Other error: {e}')

Best Practices

• Always provide descriptive error messages when raising AuthError to help with debugging and user feedback
• Catch AuthError specifically before catching general Exception to handle authentication failures differently from other errors
• Use AuthError consistently throughout your codebase for all authentication-related failures to maintain clear error handling patterns
• Consider logging AuthError occurrences for security monitoring and audit trails
• Don't expose sensitive information (like valid usernames or password hints) in the error message
• Raise AuthError as early as possible when authentication fails to prevent unauthorized code execution
• Document in your API/module which functions may raise AuthError so callers know to handle it

Tags

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