Initial commit

pkg/utils/utils.go

@@ -0,0 +1,40 @@
+package utils
+
+import (
+	"encoding/json"
+	"net/http"
+	"os"
+
+	"github.com/open-policy-agent/frameworks/constraint/pkg/externaldata"
+	"k8s.io/klog/v2"
+)
+
+const (
+	apiVersion = "externaldata.gatekeeper.sh/v1beta1"
+	kind       = "ProviderResponse"
+)
+
+// sendResponse sends back the response to Gatekeeper.
+func SendResponse(results *[]externaldata.Item, systemErr string, w http.ResponseWriter) {
+	response := externaldata.ProviderResponse{
+		APIVersion: apiVersion,
+		Kind:       kind,
+		Response: externaldata.Response{
+			Idempotent: true, // mutation requires idempotent results
+		},
+	}
+
+	if results != nil {
+		response.Response.Items = *results
+	} else {
+		response.Response.SystemError = systemErr
+	}
+
+	klog.InfoS("sending response", "response", response)
+
+	w.WriteHeader(http.StatusOK)
+	if err := json.NewEncoder(w).Encode(response); err != nil {
+		klog.ErrorS(err, "unable to encode response")
+		os.Exit(1)
+	}
+}