DS apiserver: Fix resource path (#85494)

pkg/registry/apis/datasource/sub_resource.go

@@ -55,31 +55,23 @@ func (r *subResourceREST) Connect(ctx context.Context, name string, opts runtime
 	ctx = contextualMiddlewares(ctx)
 
 	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
-		body, err := io.ReadAll(req.Body)
+		clonedReq, err := resourceRequest(req)
 		if err != nil {
 			responder.Error(err)
 			return
 		}
 
-		idx := strings.LastIndex(req.URL.Path, "/resource")
-		if idx < 0 {
-			responder.Error(fmt.Errorf("expected resource path")) // 400?
+		body, err := io.ReadAll(req.Body)
+		if err != nil {
+			responder.Error(err)
 			return
 		}
 
-		clonedReq := req.Clone(req.Context())
-		rawURL := req.URL.Path[idx+len("/resource"):]
-
-		clonedReq.URL = &url.URL{
-			Path:     rawURL,
-			RawQuery: clonedReq.URL.RawQuery,
-		}
-
 		err = r.builder.client.CallResource(ctx, &backend.CallResourceRequest{
 			PluginContext: pluginCtx,
 			Path:          clonedReq.URL.Path,
 			Method:        req.Method,
-			URL:           req.URL.String(),
+			URL:           clonedReq.URL.String(),
 			Body:          body,
 			Headers:       req.Header,
 		}, httpresponsesender.New(w))
@@ -89,3 +81,20 @@ func (r *subResourceREST) Connect(ctx context.Context, name string, opts runtime
 		}
 	}), nil
 }
+
+func resourceRequest(req *http.Request) (*http.Request, error) {
+	idx := strings.LastIndex(req.URL.Path, "/resource")
+	if idx < 0 {
+		return nil, fmt.Errorf("expected resource path") // 400?
+	}
+
+	clonedReq := req.Clone(req.Context())
+	rawURL := strings.TrimLeft(req.URL.Path[idx+len("/resource"):], "/")
+
+	clonedReq.URL = &url.URL{
+		Path:     rawURL,
+		RawQuery: clonedReq.URL.RawQuery,
+	}
+
+	return clonedReq, nil
+}

pkg/registry/apis/datasource/sub_resource_test.go

@@ -0,0 +1,71 @@
+package datasource
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestResourceRequest(t *testing.T) {
+	testCases := []struct {
+		desc         string
+		url          string
+		error        bool
+		expectedPath string
+		expectedURL  string
+	}{
+		{
+			desc:  "no resource path",
+			url:   "http://localhost:6443/apis/test.datasource.grafana.app/v0alpha1/namespaces/default/connections/abc",
+			error: true,
+		},
+		{
+			desc:         "root resource path",
+			url:          "http://localhost:6443/apis/test.datasource.grafana.app/v0alpha1/namespaces/default/connections/abc/resource",
+			expectedPath: "",
+			expectedURL:  "",
+		},
+		{
+			desc:         "root resource path",
+			url:          "http://localhost:6443/apis/test.datasource.grafana.app/v0alpha1/namespaces/default/connections/abc/resource/",
+			expectedPath: "",
+			expectedURL:  "",
+		},
+		{
+			desc:         "resource sub path",
+			url:          "http://localhost:6443/apis/test.datasource.grafana.app/v0alpha1/namespaces/default/connections/abc/resource/test",
+			expectedPath: "test",
+			expectedURL:  "test",
+		},
+		{
+			desc:         "resource sub path with colon",
+			url:          "http://localhost:6443/apis/test.datasource.grafana.app/v0alpha1/namespaces/default/connections/abc/resource/test-*,*:test-*/_mapping",
+			expectedPath: "test-*,*:test-*/_mapping",
+			expectedURL:  "./test-%2A,%2A:test-%2A/_mapping",
+		},
+		{
+			desc:         "resource sub path with query params",
+			url:          "http://localhost:6443/apis/test.datasource.grafana.app/v0alpha1/namespaces/default/connections/abc/resource/test?k1=v1&k2=v2",
+			expectedPath: "test",
+			expectedURL:  "test?k1=v1&k2=v2",
+		},
+	}
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, tc.url, nil)
+			clonedReq, err := resourceRequest(req)
+
+			if tc.error {
+				require.Error(t, err)
+				require.Nil(t, clonedReq)
+			} else {
+				require.NoError(t, err)
+				require.NotNil(t, clonedReq)
+				require.Equal(t, tc.expectedPath, clonedReq.URL.Path)
+				require.Equal(t, tc.expectedURL, clonedReq.URL.String())
+			}
+		})
+	}
+}