security: httpOnly cookies, rate limiting, nginx headers, SSE sanitization

Auth / token storage:
- JWT is now set as an httpOnly Secure SameSite=Lax cookie on login
- Add POST /auth/logout endpoint that clears the cookie
- get_current_member falls back to rh_token cookie when no Authorization header
- WebSocket auth now accepts cookie (rh_token) or optional ?token= query param
- Frontend removes all localStorage JWT access; uses credentials:"include" on
  every fetch so the httpOnly cookie is sent automatically
- Replace clearToken() with logout() that calls the server logout endpoint
- Non-sensitive rh_session flag in localStorage used only for client-side routing

Rate limiting:
- Add slowapi>=0.1.9 dependency
- /auth/login limited to 10 req/min per IP
- /auth/register limited to 5 req/min per IP

Nginx security headers:
- Add X-Frame-Options, X-Content-Type-Options, Referrer-Policy,
  X-XSS-Protection, Permissions-Policy to all responses

SSE error leakage:
- songs.py nc-scan/stream no longer leaks str(exc) to clients

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/src/rehearsalhub/routers/auth.py

@@ -2,10 +2,13 @@ import logging
 import os
 import uuid
 
-from fastapi import APIRouter, Depends, File, HTTPException, UploadFile, status
+from fastapi import APIRouter, Depends, File, HTTPException, Request, Response, UploadFile, status
 from PIL import Image, UnidentifiedImageError
+from slowapi import Limiter
+from slowapi.util import get_remote_address
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from rehearsalhub.config import get_settings
 from rehearsalhub.db.engine import get_session
 from rehearsalhub.db.models import Member
 from rehearsalhub.dependencies import get_current_member
@@ -17,13 +20,15 @@ from rehearsalhub.services.auth import AuthService
 log = logging.getLogger(__name__)
 
 router = APIRouter(prefix="/auth", tags=["auth"])
+limiter = Limiter(key_func=get_remote_address)
 
 _ALLOWED_IMAGE_EXTENSIONS = {"jpg", "jpeg", "png", "gif", "webp"}
 _MAX_AVATAR_SIZE = 5 * 1024 * 1024  # 5 MB
 
 
 @router.post("/register", response_model=MemberRead, status_code=status.HTTP_201_CREATED)
-async def register(req: RegisterRequest, session: AsyncSession = Depends(get_session)):
+@limiter.limit("5/minute")
+async def register(request: Request, req: RegisterRequest, session: AsyncSession = Depends(get_session)):
     svc = AuthService(session)
     try:
         member = await svc.register(req)
@@ -33,16 +38,38 @@ async def register(req: RegisterRequest, session: AsyncSession = Depends(get_ses
 
 
 @router.post("/login", response_model=TokenResponse)
-async def login(req: LoginRequest, session: AsyncSession = Depends(get_session)):
+@limiter.limit("10/minute")
+async def login(
+    request: Request,
+    req: LoginRequest,
+    response: Response,
+    session: AsyncSession = Depends(get_session),
+):
     svc = AuthService(session)
     token = await svc.login(req.email, req.password)
     if token is None:
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid credentials"
         )
+    settings = get_settings()
+    response.set_cookie(
+        key="rh_token",
+        value=token.access_token,
+        httponly=True,
+        secure=not settings.debug,
+        samesite="lax",
+        max_age=settings.access_token_expire_minutes * 60,
+        path="/",
+    )
     return token
 
 
+@router.post("/logout", status_code=status.HTTP_204_NO_CONTENT)
+async def logout(response: Response):
+    response.delete_cookie(key="rh_token", path="/")
+    return None
+
+
 @router.get("/me", response_model=MemberRead)
 async def get_me(current_member: Member = Depends(get_current_member)):
     return MemberRead.from_model(current_member)

api/src/rehearsalhub/routers/songs.py

@@ -180,9 +180,9 @@ async def scan_nextcloud_stream(
                     yield json.dumps(event) + "\n"
                     if event.get("type") in ("song", "session"):
                         await db.commit()
-            except Exception as exc:
+            except Exception:
                 log.exception("SSE scan error for band %s", band_id)
-                yield json.dumps({"type": "error", "message": str(exc)}) + "\n"
+                yield json.dumps({"type": "error", "message": "Scan failed due to an internal error."}) + "\n"
             finally:
                 await db.commit()
 

api/src/rehearsalhub/routers/ws.py

@@ -16,13 +16,19 @@ router = APIRouter(tags=["websocket"])
 async def version_ws(
     version_id: uuid.UUID,
     websocket: WebSocket,
-    token: str = Query(...),
+    token: str | None = Query(None),
 ):
-    """WebSocket endpoint. Requires a valid JWT passed as ?token=<jwt>."""
-    # Validate token before accepting the connection
+    """
+    WebSocket endpoint. Authentication via:
+    - ?token=<jwt> query parameter, or
+    - rh_token httpOnly cookie (sent automatically by the browser)
+    """
+    raw_token = token or websocket.cookies.get("rh_token")
     async for session in get_session():
         try:
-            payload = decode_token(token)
+            if not raw_token:
+                raise ValueError("no token")
+            payload = decode_token(raw_token)
             member_id = uuid.UUID(payload["sub"])
             member = await MemberRepository(session).get_by_id(member_id)
             if member is None: