feat: auto-derive oidc.discovery_url from NEXTCLOUD_HOST

When OIDC_DISCOVERY_URL is not explicitly set, the status endpoint now
auto-derives the discovery URL from NEXTCLOUD_HOST using the standard
well-known path. This allows Astrolabe to discover OIDC endpoints
without requiring explicit OIDC configuration.

The oidc block is now included in the status response regardless of
auth mode when a discovery URL is available (explicit or derived),
enabling smoother auth mode transitions.

Closes #1

nextcloud_mcp_server/api/management.py

@@ -235,18 +235,20 @@ async def get_server_status(request: Request) -> JSONResponse:
     if mode == AuthMode.MULTI_USER_BASIC:
         response_data["supports_app_passwords"] = settings.enable_offline_access
 
-    # Include OIDC configuration if OAuth is available
-    # This includes OAuth mode AND hybrid mode (multi_user_basic + offline_access)
-    # Astrolabe needs OIDC config to discover IdP for OAuth flow in hybrid mode
-    oauth_provisioning_available = auth_mode == "oauth" or (
-        mode == AuthMode.MULTI_USER_BASIC and settings.enable_offline_access
-    )
-    if oauth_provisioning_available:
-        # Provide IdP discovery information for NC PHP app
-        oidc_config = {}
+    # Include OIDC configuration for client discovery (e.g. Astrolabe PHP app).
+    # Always attempt to provide oidc.discovery_url so clients can discover the
+    # IdP regardless of the current auth mode. This enables smoother transitions
+    # between auth modes and lets Astrolabe pre-discover OIDC endpoints.
+    oidc_config: dict[str, str] = {}
 
     if settings.oidc_discovery_url:
+        # Explicit OIDC_DISCOVERY_URL takes precedence
         oidc_config["discovery_url"] = settings.oidc_discovery_url
+    elif settings.nextcloud_host:
+        # Auto-derive from NEXTCLOUD_HOST — Nextcloud exposes OIDC discovery
+        # at the standard well-known path when user_oidc is enabled
+        host = settings.nextcloud_host.rstrip("/")
+        oidc_config["discovery_url"] = f"{host}/.well-known/openid-configuration"
 
     if settings.oidc_issuer:
         oidc_config["issuer"] = settings.oidc_issuer

tests/unit/test_management_status_endpoint.py

@@ -37,6 +37,7 @@ def create_mock_settings(
     oidc_issuer: str | None = None,
     vector_sync_enabled: bool = False,
     nextcloud_url: str = "http://localhost",
+    nextcloud_host: str | None = "http://localhost",
     enable_token_exchange: bool = False,
     mcp_client_id: str | None = None,
     mcp_client_secret: str | None = None,
@@ -49,6 +50,7 @@ def create_mock_settings(
     settings.oidc_issuer = oidc_issuer
     settings.vector_sync_enabled = vector_sync_enabled
     settings.nextcloud_url = nextcloud_url
+    settings.nextcloud_host = nextcloud_host
     settings.enable_token_exchange = enable_token_exchange
     settings.mcp_client_id = mcp_client_id
     settings.mcp_client_secret = mcp_client_secret
@@ -133,6 +135,7 @@ class TestStatusEndpointOidcConfig:
             enable_offline_access=False,  # Key difference: no offline access
             oidc_discovery_url="http://keycloak/.well-known/openid-configuration",
             oidc_issuer="http://keycloak/realms/test",
+            nextcloud_host=None,
         )
 
         with (
@@ -196,12 +199,13 @@ class TestStatusEndpointOidcConfig:
             )
 
     def test_single_user_basic_no_oidc(self):
-        """Test that single-user BasicAuth mode doesn't return OIDC config."""
+        """Test that single-user BasicAuth mode doesn't return OIDC config when no host."""
         mock_settings = create_mock_settings(
             enable_multi_user_basic=False,
             enable_offline_access=False,
             oidc_discovery_url="http://keycloak/.well-known/openid-configuration",
             oidc_issuer="http://keycloak/realms/test",
+            nextcloud_host=None,
         )
 
         with (
@@ -344,3 +348,127 @@ class TestStatusEndpointBasicResponse:
             data = response.json()
 
             assert data["vector_sync_enabled"] is True
+
+
+class TestStatusEndpointOidcAutoDerivation:
+    """Tests for OIDC discovery_url auto-derivation from NEXTCLOUD_HOST."""
+
+    def test_derives_discovery_url_from_nextcloud_host(self):
+        """Test that discovery_url is auto-derived from nextcloud_url when not explicit."""
+        mock_settings = create_mock_settings(
+            oidc_discovery_url=None,
+            oidc_issuer=None,
+        )
+        mock_settings.nextcloud_host = "https://cloud.example.com"
+
+        with (
+            patch(
+                "nextcloud_mcp_server.api.management.get_settings",
+                return_value=mock_settings,
+            ),
+            patch(
+                "nextcloud_mcp_server.api.management.detect_auth_mode",
+                return_value=AuthMode.SINGLE_USER_BASIC,
+            ),
+        ):
+            app = create_test_app()
+            client = TestClient(app)
+            response = client.get("/api/v1/status")
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "oidc" in data
+            assert (
+                data["oidc"]["discovery_url"]
+                == "https://cloud.example.com/.well-known/openid-configuration"
+            )
+
+    def test_derives_discovery_url_strips_trailing_slash(self):
+        """Test that trailing slash on nextcloud_host is stripped."""
+        mock_settings = create_mock_settings(
+            oidc_discovery_url=None,
+            oidc_issuer=None,
+        )
+        mock_settings.nextcloud_host = "https://cloud.example.com/"
+
+        with (
+            patch(
+                "nextcloud_mcp_server.api.management.get_settings",
+                return_value=mock_settings,
+            ),
+            patch(
+                "nextcloud_mcp_server.api.management.detect_auth_mode",
+                return_value=AuthMode.SINGLE_USER_BASIC,
+            ),
+        ):
+            app = create_test_app()
+            client = TestClient(app)
+            response = client.get("/api/v1/status")
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "oidc" in data
+            assert (
+                data["oidc"]["discovery_url"]
+                == "https://cloud.example.com/.well-known/openid-configuration"
+            )
+
+    def test_explicit_discovery_url_takes_precedence(self):
+        """Test that explicit OIDC_DISCOVERY_URL overrides auto-derivation."""
+        mock_settings = create_mock_settings(
+            oidc_discovery_url="https://keycloak.example.com/.well-known/openid-configuration",
+            oidc_issuer=None,
+        )
+        mock_settings.nextcloud_host = "https://cloud.example.com"
+
+        with (
+            patch(
+                "nextcloud_mcp_server.api.management.get_settings",
+                return_value=mock_settings,
+            ),
+            patch(
+                "nextcloud_mcp_server.api.management.detect_auth_mode",
+                return_value=AuthMode.SINGLE_USER_BASIC,
+            ),
+        ):
+            app = create_test_app()
+            client = TestClient(app)
+            response = client.get("/api/v1/status")
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "oidc" in data
+            assert (
+                data["oidc"]["discovery_url"]
+                == "https://keycloak.example.com/.well-known/openid-configuration"
+            )
+
+    def test_no_oidc_when_no_host_and_no_discovery_url(self):
+        """Test that oidc block is absent when neither host nor discovery_url is set."""
+        mock_settings = create_mock_settings(
+            oidc_discovery_url=None,
+            oidc_issuer=None,
+        )
+        mock_settings.nextcloud_host = None
+
+        with (
+            patch(
+                "nextcloud_mcp_server.api.management.get_settings",
+                return_value=mock_settings,
+            ),
+            patch(
+                "nextcloud_mcp_server.api.management.detect_auth_mode",
+                return_value=AuthMode.SINGLE_USER_BASIC,
+            ),
+        ):
+            app = create_test_app()
+            client = TestClient(app)
+            response = client.get("/api/v1/status")
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "oidc" not in data