154 lines
4.3 KiB
Python
154 lines
4.3 KiB
Python
"""Authentication dependencies"""
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from typing import Optional, Annotated
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from fastapi import Depends, HTTPException, Header, Cookie
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from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
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from jose import JWTError, jwt
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from datetime import datetime, timedelta
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from app.services.atproto import AtprotoService
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from app.core.config import settings
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# Bearer token scheme
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bearer_scheme = HTTPBearer(auto_error=False)
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# JWT settings
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SECRET_KEY = settings.secret_key if hasattr(settings, 'secret_key') else "your-secret-key"
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24 # 24 hours
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class AuthUser:
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"""Authenticated user data"""
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def __init__(self, did: str, handle: Optional[str] = None):
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self.did = did
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self.handle = handle
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
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"""Create JWT access token"""
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to_encode = data.copy()
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if expires_delta:
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expire = datetime.utcnow() + expires_delta
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else:
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expire = datetime.utcnow() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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to_encode.update({"exp": expire})
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encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded_jwt
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async def verify_token(token: str) -> Optional[AuthUser]:
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"""Verify JWT token and return user"""
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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did: str = payload.get("did")
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if did is None:
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return None
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handle: Optional[str] = payload.get("handle")
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return AuthUser(did=did, handle=handle)
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except JWTError:
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return None
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async def get_current_user(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(bearer_scheme),
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token_cookie: Optional[str] = Cookie(None, alias="ai_card_token")
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) -> Optional[AuthUser]:
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"""
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Get current user from JWT token
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Supports both Bearer token and cookie
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"""
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token = None
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# Try Bearer token first
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if credentials and credentials.credentials:
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token = credentials.credentials
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# Fall back to cookie
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elif token_cookie:
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token = token_cookie
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if not token:
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return None
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user = await verify_token(token)
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return user
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async def require_user(
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current_user: Optional[AuthUser] = Depends(get_current_user)
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) -> AuthUser:
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"""Require authenticated user"""
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if not current_user:
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raise HTTPException(
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status_code=401,
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detail="Not authenticated",
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headers={"WWW-Authenticate": "Bearer"},
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)
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return current_user
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async def get_optional_user(
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current_user: Optional[AuthUser] = Depends(get_current_user)
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) -> Optional[AuthUser]:
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"""Get user if authenticated, None otherwise"""
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return current_user
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class AtprotoAuth:
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"""atproto authentication handler"""
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def __init__(self):
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self.service = AtprotoService()
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async def authenticate(self, identifier: str, password: str) -> Optional[AuthUser]:
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"""
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Authenticate user with atproto
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Args:
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identifier: Handle or DID
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password: App password
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Returns:
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AuthUser if successful
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"""
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try:
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# Login to atproto
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session = await self.service.login(identifier, password)
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# Get user info from session
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# The session contains the DID
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if self.service.client:
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did = self.service.client.did
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handle = self.service.client.handle
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return AuthUser(did=did, handle=handle)
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return None
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except Exception:
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return None
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async def verify_did_ownership(self, did: str, session_string: str) -> bool:
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"""
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Verify user owns the DID by checking session
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Args:
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did: DID to verify
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session_string: Session string from login
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Returns:
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True if session is valid for DID
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"""
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try:
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self.service.restore_session(session_string)
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if self.service.client and self.service.client.did == did:
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return True
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return False
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except Exception:
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return False |