fix: address PR review round 3 — info disclosure, conditional routes, cleanup

- Replace exception details in user-facing error page with generic message
- Only register /app/provision routes when enable_login_flow is true
- Piggyback expired provision session cleanup on hourly cleanup loop
- Add multi-process limitation comment on in-memory session store
- Add comment explaining login_url vs poll_endpoint rewrite asymmetry
- Document curl dependency in Dockerfile (healthcheck probes)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -3,8 +3,9 @@ FROM docker.io/library/python:3.12-slim-trixie@sha256:f3fa41d74a768c2fce8016b98c
 COPY --from=ghcr.io/astral-sh/uv:0.10.12@sha256:72ab0aeb448090480ccabb99fb5f52b0dc3c71923bffb5e2e26517a1c27b7fec /uv /uvx /bin/
 
 # Install dependencies
-# 1. git (required for caldav dependency from git)
-# 2. sqlite for development with token db
+# 1. curl (required for container healthcheck probes)
+# 2. git (required for caldav dependency from git)
+# 3. sqlite for development with token db
 RUN apt update && apt install --no-install-recommends --no-install-suggests -y \
     curl \
     git \

nextcloud_mcp_server/app.py

@@ -1398,6 +1398,9 @@ def get_app(transport: str = "streamable-http", enabled_apps: list[str] | None =
         from nextcloud_mcp_server.auth.oauth_routes import (  # noqa: PLC0415
             _cleanup_expired_proxy_codes,
         )
+        from nextcloud_mcp_server.auth.provision_routes import (  # noqa: PLC0415
+            _cleanup_expired_sessions as _cleanup_expired_provision_sessions,
+        )
 
         while True:
             try:
@@ -1407,6 +1410,8 @@ def get_app(transport: str = "streamable-http", enabled_apps: list[str] | None =
                     logger.info(f"Cleaned up {count} expired login flow sessions")
                 # Also clean up expired AS proxy codes/sessions
                 _cleanup_expired_proxy_codes()
+                # Clean up expired web provision sessions
+                _cleanup_expired_provision_sessions()
             except Exception as e:
                 logger.warning(f"Login flow cleanup error: {e}")
             await anyio.sleep(3600)  # Every hour
@@ -2337,11 +2342,6 @@ def get_app(transport: str = "streamable-http", enabled_apps: list[str] | None =
             chunk_context_endpoint,
             methods=["GET"],
         ),  # /app/chunk-context
-        # Login Flow v2 web provisioning (used by Astrolabe)
-        Route("/provision", provision_page, methods=["GET"]),  # /app/provision
-        Route(
-            "/provision/status", provision_status, methods=["GET"]
-        ),  # /app/provision/status
         # Webhook management routes (admin-only)
         Route("/webhooks", webhook_management_pane, methods=["GET"]),  # /app/webhooks
         Route(
@@ -2356,6 +2356,15 @@ def get_app(transport: str = "streamable-http", enabled_apps: list[str] | None =
         ),
     ]
 
+    # Login Flow v2 web provisioning (only when Login Flow is enabled)
+    if settings.enable_login_flow:
+        browser_routes += [
+            Route("/provision", provision_page, methods=["GET"]),  # /app/provision
+            Route(
+                "/provision/status", provision_status, methods=["GET"]
+            ),  # /app/provision/status
+        ]
+
     # Add static files mount if directory exists
     static_dir = os.path.join(os.path.dirname(__file__), "auth", "static")
     if os.path.isdir(static_dir):

nextcloud_mcp_server/auth/provision_routes.py

@@ -30,8 +30,10 @@ from nextcloud_mcp_server.config import get_nextcloud_ssl_verify, get_settings
 
 logger = logging.getLogger(__name__)
 
-# In-memory store for web provision sessions (short-lived, no persistence needed)
-# Maps provision_id → session data
+# In-memory store for web provision sessions (short-lived, no persistence needed).
+# Maps provision_id → session data.
+# NOTE: This does not work with multi-process deployments (e.g. uvicorn --workers N).
+# Login Flow v2 mode assumes a single worker process.
 _provision_sessions: dict[str, dict] = {}
 
 # Session TTL: 20 minutes (matches Nextcloud's Login Flow v2 timeout)
@@ -192,7 +194,9 @@ async def provision_page(request: Request) -> RedirectResponse | HTMLResponse:
     except Exception as e:
         logger.error(f"Failed to initiate Login Flow v2 for web provision: {e}")
         return HTMLResponse(
-            content=_render_error(f"Failed to start login flow: {e}"),
+            content=_render_error(
+                "Failed to start login flow. Please try again later."
+            ),
             status_code=502,
         )
 
@@ -230,6 +234,9 @@ async def provision_page(request: Request) -> RedirectResponse | HTMLResponse:
     # Redirect to Nextcloud's Login Flow v2 login page.
     # The login_url may use the internal Docker hostname (http://app/...).
     # Replace with the public Nextcloud URL for the browser.
+    # Note: poll_endpoint is rewritten to NEXTCLOUD_HOST (server-side, in
+    # LoginFlowV2Client) while login_url is rewritten to the public issuer
+    # URL here because the browser needs a publicly-reachable address.
     login_url = init_response.login_url
     public_issuer = os.getenv("NEXTCLOUD_PUBLIC_ISSUER_URL", "")
     if public_issuer and nextcloud_host: