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- Auto-fix F401 (unused imports) and I001 (unsorted imports) with ruff --fix - Manually fix E501 (line too long) in alembic migrations and src/ models - Run ruff format to ensure consistent formatting Co-Authored-By: Paperclip <noreply@paperclip.ing>
103 lines
3.4 KiB
Python
103 lines
3.4 KiB
Python
"""FastAPI dependency injection for authentication.
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Validates Better-Auth session tokens from cookies or Bearer header.
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Sessions are verified by querying the shared sessions table directly.
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"""
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from datetime import UTC, datetime
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from fastapi import Depends, Header, HTTPException, Request, status
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from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
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from sqlalchemy import text
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from sqlalchemy.ext.asyncio import AsyncSession
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from cartsnitch_api.config import settings
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from cartsnitch_api.database import get_db
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# Keep Bearer scheme as optional — Better-Auth primarily uses cookies,
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# but we support Bearer tokens for service-to-service or mobile clients.
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bearer_scheme = HTTPBearer(auto_error=False)
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# Better-Auth session cookie name
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SESSION_COOKIE_NAME = "better-auth.session_token"
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# Secure prefix used by better-auth on HTTPS deployments
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SECURE_SESSION_COOKIE_NAME = "__Secure-better-auth.session_token"
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async def _validate_session_token(token: str, db: AsyncSession) -> str:
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"""Validate a Better-Auth session token against the sessions table.
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Better-Auth stores the raw token in the DB. The cookie/Bearer header
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carries the same raw token, so we compare directly.
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"""
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result = await db.execute(
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text("SELECT user_id, expires_at FROM sessions WHERE token = :token"),
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{"token": token},
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)
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row = result.first()
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if not row:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid session token",
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)
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user_id, expires_at = row
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if expires_at.tzinfo is None:
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# Treat naive datetimes as UTC
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expires_at = expires_at.replace(tzinfo=UTC)
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if expires_at < datetime.now(UTC):
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Session expired",
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)
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return str(user_id)
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async def get_current_user(
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request: Request,
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credentials: HTTPAuthorizationCredentials | None = Depends(bearer_scheme),
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db: AsyncSession = Depends(get_db),
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) -> str:
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"""Extract and validate the session token from cookie or Authorization header.
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Checks in order:
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1. Better-Auth session cookie (primary — web clients)
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2. Bearer token in Authorization header (fallback — API clients)
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"""
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token: str | None = None
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# 1. Check session cookie — prefer __Secure- variant (HTTPS) over plain (HTTP dev)
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cookie_token = request.cookies.get(SECURE_SESSION_COOKIE_NAME) or request.cookies.get(
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SESSION_COOKIE_NAME
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)
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if cookie_token:
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# Better-Auth cookie format is "token.sessionId" — extract just the token part
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token = cookie_token.split(".")[0] if "." in cookie_token else cookie_token
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# 2. Fall back to Bearer header
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if not token and credentials:
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# Callers might pass the compound value here too
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raw = credentials.credentials
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token = raw.split(".")[0] if "." in raw else raw
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if not token:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Authentication required",
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)
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user_id = await _validate_session_token(token, db)
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request.state.user_id = user_id
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return user_id
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async def verify_service_key(x_service_key: str = Header()) -> None:
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if x_service_key != settings.service_key:
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Invalid service key",
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)
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