237 lines
8.5 KiB
Python
237 lines
8.5 KiB
Python
import asyncio
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import time
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from typing import Any, Optional
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import jwt
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from fastapi import HTTPException, status, Request
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from fastapi.security import OAuth2PasswordBearer
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from decnet.web.auth import ALGORITHM, SECRET_KEY
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from decnet.web.db.repository import BaseRepository
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from decnet.web.db.factory import get_repository
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# Shared repository singleton
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_repo: Optional[BaseRepository] = None
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def get_repo() -> BaseRepository:
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"""FastAPI dependency to inject the configured repository."""
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global _repo
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if _repo is None:
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_repo = get_repository()
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return _repo
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repo = get_repo()
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")
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# Per-request user lookup was the hidden tax behind every authed endpoint —
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# SELECT users WHERE uuid=? ran once per call, serializing through aiosqlite.
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# 10s TTL is well below JWT expiry and we invalidate on all user writes.
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_USER_TTL = 10.0
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_user_cache: dict[str, tuple[Optional[dict[str, Any]], float]] = {}
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_user_cache_lock: Optional[asyncio.Lock] = None
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# Username cache for the login hot path. Short TTL — the bcrypt verify
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# still runs against the cached hash, so security is unchanged. The
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# staleness window is: if a password is changed, the old password is
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# usable for up to _USERNAME_TTL seconds until the cache expires (or
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# invalidate_user_cache fires). We invalidate on every user write.
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# Missing lookups are NOT cached to avoid locking out a just-created user.
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_USERNAME_TTL = 5.0
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_username_cache: dict[str, tuple[dict[str, Any], float]] = {}
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_username_cache_lock: Optional[asyncio.Lock] = None
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def _reset_user_cache() -> None:
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global _user_cache, _user_cache_lock, _username_cache, _username_cache_lock
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_user_cache = {}
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_user_cache_lock = None
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_username_cache = {}
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_username_cache_lock = None
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def invalidate_user_cache(user_uuid: Optional[str] = None) -> None:
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"""Drop a single user (or all users) from the auth caches.
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Callers: password change, role change, user create/delete.
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The username cache is always cleared wholesale — we don't track
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uuid→username and user writes are rare, so the cost is trivial.
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"""
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if user_uuid is None:
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_user_cache.clear()
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else:
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_user_cache.pop(user_uuid, None)
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_username_cache.clear()
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async def get_user_by_username_cached(username: str) -> Optional[dict[str, Any]]:
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"""Cached read of get_user_by_username for the login path.
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Positive hits are cached for _USERNAME_TTL seconds. Misses bypass
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the cache so a freshly-created user can log in immediately.
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"""
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global _username_cache_lock
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entry = _username_cache.get(username)
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now = time.monotonic()
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if entry is not None and now - entry[1] < _USERNAME_TTL:
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return entry[0]
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if _username_cache_lock is None:
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_username_cache_lock = asyncio.Lock()
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async with _username_cache_lock:
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entry = _username_cache.get(username)
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now = time.monotonic()
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if entry is not None and now - entry[1] < _USERNAME_TTL:
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return entry[0]
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user = await repo.get_user_by_username(username)
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if user is not None:
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_username_cache[username] = (user, time.monotonic())
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return user
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async def _get_user_cached(user_uuid: str) -> Optional[dict[str, Any]]:
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global _user_cache_lock
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entry = _user_cache.get(user_uuid)
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now = time.monotonic()
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if entry is not None and now - entry[1] < _USER_TTL:
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return entry[0]
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if _user_cache_lock is None:
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_user_cache_lock = asyncio.Lock()
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async with _user_cache_lock:
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entry = _user_cache.get(user_uuid)
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now = time.monotonic()
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if entry is not None and now - entry[1] < _USER_TTL:
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return entry[0]
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user = await repo.get_user_by_uuid(user_uuid)
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_user_cache[user_uuid] = (user, time.monotonic())
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return user
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async def get_stream_user(request: Request, token: Optional[str] = None) -> str:
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"""Auth dependency for SSE endpoints — accepts Bearer header OR ?token= query param.
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EventSource does not support custom headers, so the query-string fallback is intentional here only.
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"""
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_credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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auth_header = request.headers.get("Authorization")
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resolved: str | None = (
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auth_header.split(" ", 1)[1]
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if auth_header and auth_header.startswith("Bearer ")
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else token
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)
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if not resolved:
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raise _credentials_exception
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try:
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_payload: dict[str, Any] = jwt.decode(resolved, SECRET_KEY, algorithms=[ALGORITHM])
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_user_uuid: Optional[str] = _payload.get("uuid")
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if _user_uuid is None:
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raise _credentials_exception
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return _user_uuid
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except jwt.PyJWTError:
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raise _credentials_exception
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async def _decode_token(request: Request) -> str:
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"""Decode and validate a Bearer JWT, returning the user UUID."""
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_credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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auth_header = request.headers.get("Authorization")
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token: str | None = (
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auth_header.split(" ", 1)[1]
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if auth_header and auth_header.startswith("Bearer ")
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else None
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)
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if not token:
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raise _credentials_exception
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try:
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_payload: dict[str, Any] = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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_user_uuid: Optional[str] = _payload.get("uuid")
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if _user_uuid is None:
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raise _credentials_exception
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return _user_uuid
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except jwt.PyJWTError:
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raise _credentials_exception
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async def get_current_user(request: Request) -> str:
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"""Auth dependency — enforces must_change_password."""
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_user_uuid = await _decode_token(request)
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_user = await _get_user_cached(_user_uuid)
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if _user and _user.get("must_change_password"):
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Password change required before accessing this resource",
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)
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return _user_uuid
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async def get_current_user_unchecked(request: Request) -> str:
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"""Auth dependency — skips must_change_password enforcement.
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Use only for endpoints that must remain reachable with the flag set (e.g. change-password).
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"""
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return await _decode_token(request)
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# ---------------------------------------------------------------------------
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# Role-based access control
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# ---------------------------------------------------------------------------
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def require_role(*allowed_roles: str):
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"""Factory that returns a FastAPI dependency enforcing role membership.
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Inlines JWT decode + user lookup + must_change_password + role check so the
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user is only loaded from the DB once per request (not once in
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``get_current_user`` and again here). Returns the full user dict so
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endpoints can inspect ``user["uuid"]``, ``user["role"]``, etc.
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"""
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async def _check(request: Request) -> dict:
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user_uuid = await _decode_token(request)
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user = await _get_user_cached(user_uuid)
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if not user:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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if user.get("must_change_password"):
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Password change required before accessing this resource",
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)
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if user["role"] not in allowed_roles:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Insufficient permissions",
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)
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return user
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return _check
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def require_stream_role(*allowed_roles: str):
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"""Like ``require_role`` but for SSE endpoints that accept a query-param token."""
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async def _check(request: Request, token: Optional[str] = None) -> dict:
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user_uuid = await get_stream_user(request, token)
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user = await _get_user_cached(user_uuid)
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if not user or user["role"] not in allowed_roles:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Insufficient permissions",
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)
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return user
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return _check
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require_admin = require_role("admin")
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require_viewer = require_role("viewer", "admin")
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require_stream_viewer = require_stream_role("viewer", "admin")
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