66 lines
2.2 KiB
Python
66 lines
2.2 KiB
Python
"""Auth middleware — JWT validation dependency.
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``get_current_user`` is the FastAPI dependency used by all protected routes.
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It decodes the Bearer JWT (identity + expiry), then fetches the current tier
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from the ``subscriptions`` table so that tier changes take effect immediately
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without requiring token re-issue.
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Exempt routes (no JWT required):
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- POST /api/v1/auth/register
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- POST /api/v1/auth/login
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- POST /api/v1/billing/webhook
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"""
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from __future__ import annotations
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from fastapi import Depends, HTTPException, status
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from fastapi.security import OAuth2PasswordBearer
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from jose import JWTError, jwt
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from sqlalchemy import select
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.config.settings import settings
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from app.db import get_session
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from app.schemas import UserProfile
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")
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async def get_current_user(
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token: str = Depends(oauth2_scheme),
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db: AsyncSession = Depends(get_session),
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) -> UserProfile:
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"""Validate a Bearer JWT and return the authenticated user.
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The JWT is used for identity and expiry only. The tier is fetched live
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from the ``subscriptions`` table so that upgrades/downgrades take effect
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immediately. Falls back to ``'free'`` when no subscription row exists.
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Raises HTTP 401 on any invalid or expired token.
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"""
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credentials_exc = 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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try:
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payload = jwt.decode(
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token, settings.JWT_SECRET, algorithms=[settings.JWT_ALGORITHM]
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)
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user_id: str | None = payload.get("sub")
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email: str | None = payload.get("email")
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if not user_id or not email:
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raise credentials_exc
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except JWTError:
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raise credentials_exc
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# Live tier lookup — subscription row is the authoritative source.
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from app.models import Subscription # noqa: PLC0415
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result = await db.execute(
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select(Subscription.tier).where(Subscription.user_id == user_id)
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)
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tier: str = result.scalar_one_or_none() or "free"
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return UserProfile(id=user_id, email=email, tier=tier) # type: ignore[arg-type]
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