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"""
FastAPI shared dependencies — injected via Depends().
JWT scope enforcement:
- "user" scope (browser login): full access to all endpoints
- "node" scope (Ed25519 daemon auth): read-only group access + node operations
Node-scoped tokens CANNOT create/delete groups or manage membership.
"""
from fastapi import Depends, Header, HTTPException, status
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from meshbay_hub.auth import decode_access_token
from meshbay_hub.db.engine import get_db
from meshbay_hub.db.models import User
_admin_usernames: set[str] = set()
def set_admin_usernames(usernames: list[str]) -> None:
global _admin_usernames
_admin_usernames = set(usernames)
async def _decode_token(authorization: str = Header(...)) -> dict:
"""Decode and verify JWT bearer token. Returns full payload."""
try:
scheme, token = authorization.split(None, 1)
if scheme.lower() != "bearer":
raise ValueError
return decode_access_token(token)
except Exception:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid or expired token",
headers={"WWW-Authenticate": "Bearer"},
)
async def get_current_user(
payload: dict = Depends(_decode_token),
db: AsyncSession = Depends(get_db),
) -> User:
"""
Verify the JWT bearer token and return the User from the database.
Accepts both user-scoped and node-scoped tokens.
"""
result = await db.execute(
select(User).where(User.id == payload["sub"]))
user = result.scalar_one_or_none()
if user is None:
raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED,
detail="User not found")
if user.status != "active":
raise HTTPException(status_code=status.HTTP_403_FORBIDDEN,
detail=f"Account {user.status}")
return user
async def require_user_scope(
payload: dict = Depends(_decode_token),
current_user: User = Depends(get_current_user),
) -> User:
"""Reject node-scoped tokens — only browser (user-scope) can mutate groups."""
if payload.get("scope") == "node":
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Node-scoped token cannot perform this operation — use browser",
)
return current_user
def user_is_admin(user: User) -> bool:
"""Admin by DB role or by the config allow-list. Use inside a handler that
already depends on `require_moderator` but has to draw the admin line for
one field (see `admin_patch_user`)."""
return user.role == "admin" or user.username in _admin_usernames
def user_is_moderator(user: User) -> bool:
return user.role in ("moderator", "admin") or user.username in _admin_usernames
async def require_moderator(
current_user: User = Depends(get_current_user),
) -> User:
if not user_is_moderator(current_user):
raise HTTPException(status_code=status.HTTP_403_FORBIDDEN,
detail="Moderator access required")
return current_user
async def require_admin(
current_user: User = Depends(get_current_user),
) -> User:
if not user_is_admin(current_user):
raise HTTPException(status_code=status.HTTP_403_FORBIDDEN,
detail="Admin access required")
return current_user
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