Add GET for DCV Delegation UUID endpoint

.changelog/1384.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+dcv_delegation: add GET for DCV Delegation UUID
+```

dcv_delegation.go

@@ -0,0 +1,39 @@
+package cloudflare
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/goccy/go-json"
+)
+
+type DCVDelegation struct {
+	UUID string `json:"uuid"`
+}
+
+// DCVDelegationResponse represents the response from the dcv_delegation/uuid endpoint.
+type DCVDelegationResponse struct {
+	Result DCVDelegation `json:"result"`
+	Response
+	ResultInfo `json:"result_info"`
+}
+
+// GetDCVDelegation gets a zone DCV Delegation UUID
+//
+// TODO: Add API documentation
+func (api *API) GetDCVDelegation(ctx context.Context, rc *ResourceContainer) (DCVDelegation, ResultInfo, error) {
+	uri := fmt.Sprintf("/zones/%s/dcv_delegation/uuid", rc.Identifier)
+
+	res, err := api.makeRequestContext(ctx, http.MethodGet, uri, nil)
+	if err != nil {
+		return DCVDelegation{}, ResultInfo{}, err
+	}
+	var dcvResponse DCVDelegationResponse
+	err = json.Unmarshal(res, &dcvResponse)
+	if err != nil {
+		return DCVDelegation{}, ResultInfo{}, fmt.Errorf("%s: %w", errUnmarshalError, err)
+	}
+
+	return dcvResponse.Result, dcvResponse.ResultInfo, nil
+}

dcv_delegation_test.go

@@ -0,0 +1,43 @@
+package cloudflare
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetDCVDelegation(t *testing.T) {
+	setup()
+	defer teardown()
+
+	testUuid := "b9ab465427f949ed"
+
+	handler := func(w http.ResponseWriter, r *http.Request) {
+		assert.Equal(t, http.MethodGet, r.Method, "Expected method 'GET', got %s", r.Method)
+		w.Header().Set("content-type", "application/json")
+		fmt.Fprintf(w, `{
+	"success" : true,
+	"errors": [],
+	"messages": [],
+	"result": {
+		"uuid": "%s"
+	}
+}
+		`, testUuid)
+	}
+
+	mux.HandleFunc("/zones/"+testZoneID+"/dcv_delegation/uuid", handler)
+
+	want := DCVDelegation{
+		UUID: testUuid,
+	}
+
+	actual, _, err := client.GetDCVDelegation(context.Background(), ZoneIdentifier(testZoneID))
+
+	if assert.NoError(t, err) {
+		assert.Equal(t, want, actual)
+	}
+}