"""
Authentication Module

This module implements the authentication and authorization system for 
the quantum-AI platform. It provides mechanisms for user authentication,
role-based access control, and security token management for APIs and services.

Key features:
- User authentication with multiple methods (password, OAuth, SSO)
- Role-based access control for platform resources
- API token generation and validation
- Session management for web interfaces
- Secure credential storage
- Integration with quantum resource allocation

This module ensures that only authorized users can access sensitive
quantum computations and data.
"""

def authenticate_user(username, password):
    """
    Authenticate a user with username and password.
    
    Args:
        username (str): The user's username
        password (str): The user's password
        
    Returns:
        dict: Authentication result with token and user info if successful
    """
    # Stub implementation
    pass


def verify_token(token):
    """
    Verify an authentication token.
    
    Args:
        token (str): The authentication token to verify
        
    Returns:
        bool: True if the token is valid, False otherwise
    """
    # Stub implementation
    pass


def check_permissions(user_id, resource_id, action):
    """
    Check if a user has permission to perform an action on a resource.
    
    Args:
        user_id (str): The user's ID
        resource_id (str): The resource ID
        action (str): The action to perform (read, write, execute, etc.)
        
    Returns:
        bool: True if the user has permission, False otherwise
    """
    # Stub implementation
    pass


def generate_token(user_id, expiration=None):
    """
    Generate a new authentication token for a user.
    
    Args:
        user_id (str): The user's ID
        expiration (int, optional): Token expiration time in seconds
        
    Returns:
        str: The generated token
    """
    # Stub implementation
    pass


def revoke_token(token):
    """
    Revoke an authentication token.
    
    Args:
        token (str): The token to revoke
        
    Returns:
        bool: True if the token was revoked, False otherwise
    """
    # Stub implementation
    pass 