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| import hashlib | |
| import time | |
| import random | |
| import string | |
| from typing import Dict, Any, Optional | |
| class MFAService: | |
| """Multi-factor authentication service for identity verification""" | |
| def __init__(self, api_key: Optional[str] = None): | |
| """Initialize MFA service | |
| Args: | |
| api_key: Optional API key for an external MFA service | |
| """ | |
| self.api_key = api_key | |
| # For demo purposes, we'll use a mock implementation | |
| self.connected = api_key is not None | |
| # Store active challenges (would be in a database in production) | |
| self.active_challenges = {} | |
| def generate_challenge(self, user_id: str) -> Dict[str, Any]: | |
| """Generate an MFA challenge for a user | |
| Args: | |
| user_id: User identifier | |
| Returns: | |
| Dictionary with challenge details | |
| """ | |
| # Generate a random challenge code | |
| challenge_code = ''.join(random.choices(string.digits, k=6)) | |
| # Create timestamp | |
| timestamp = time.time() | |
| # Store challenge (in production, this would be in a database) | |
| self.active_challenges[user_id] = { | |
| "code": challenge_code, | |
| "timestamp": timestamp, | |
| "verified": False | |
| } | |
| # In a real implementation, this would send an SMS, email, or push notification | |
| # to the user with the challenge code | |
| return { | |
| "challenge_id": hashlib.sha256(f"{user_id}-{timestamp}".encode()).hexdigest()[:12], | |
| "expires_at": timestamp + 300 # 5 minutes | |
| } | |
| def verify_challenge(self, user_id: str, response: str) -> bool: | |
| """Verify a user's response to an MFA challenge | |
| Args: | |
| user_id: User identifier | |
| response: User's response to the challenge | |
| Returns: | |
| True if verification successful | |
| """ | |
| # Check if user has an active challenge | |
| if user_id not in self.active_challenges: | |
| return False | |
| challenge = self.active_challenges[user_id] | |
| # Check if challenge has expired (5 minutes) | |
| if time.time() - challenge["timestamp"] > 300: | |
| del self.active_challenges[user_id] | |
| return False | |
| # Verify the response | |
| if response == challenge["code"]: | |
| challenge["verified"] = True | |
| return True | |
| return False |