do not truncate wlid if namespace is empty, use string builder

wlid/wlid.go

@@ -81,24 +81,29 @@ func generateWLID(pLevel0, level0, pLevel1, level1, k, name string) string {
 	kind := strings.ToLower(k)
 	kind = strings.Replace(kind, "-", "", -1)
 
-	wlid := WlidPrefix
-	wlid += fmt.Sprintf("%s%s", pLevel0, level0)
-	if level1 == "" {
-		return wlid
-	}
-	wlid += fmt.Sprintf("/%s%s", pLevel1, level1)
+	var wlid strings.Builder
+	wlid.WriteString(WlidPrefix)
+	wlid.WriteString(pLevel0)
+	wlid.WriteString(level0)
+
+	// don't exit if level1 is empty
+	wlid.WriteString("/")
+	wlid.WriteString(pLevel1)
+	wlid.WriteString(level1)
 
 	if kind == "" {
-		return wlid
+		return wlid.String()
 	}
-	wlid += fmt.Sprintf("/%s", kind)
+	wlid.WriteString("/")
+	wlid.WriteString(kind)
 
 	if name == "" {
-		return wlid
+		return wlid.String()
 	}
-	wlid += fmt.Sprintf("-%s", name)
+	wlid.WriteString("-")
+	wlid.WriteString(name)
 
-	return wlid
+	return wlid.String()
 }
 
 // GetWLID get the calculated wlid

wlid/wlid_test.go

@@ -1,6 +1,7 @@
 package wlid
 
 import (
+	"github.com/stretchr/testify/assert"
 	"testing"
 )
 
@@ -27,3 +28,51 @@ func TestSpiffeSIDInfoSuccess(t *testing.T) {
 		t.Errorf("TestSpiffeSIDInfoSuccess failed to parse %v", SID)
 	}
 }
+
+func Test_generateWLID(t *testing.T) {
+	type args struct {
+		pLevel0 string
+		level0  string
+		pLevel1 string
+		level1  string
+		k       string
+		name    string
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "k8s wlid",
+			args: args{
+				pLevel0: ClusterWlidPrefix,
+				level0:  "HipsterShopCluster2",
+				pLevel1: NamespaceWlidPrefix,
+				level1:  "prod",
+				k:       "Deployment",
+				name:    "cartservice",
+			},
+			want: "wlid://cluster-HipsterShopCluster2/namespace-prod/deployment-cartservice",
+		},
+		{
+			name: "k8s wlid no namespace",
+			args: args{
+				pLevel0: ClusterWlidPrefix,
+				level0:  "HipsterShopCluster2",
+				pLevel1: NamespaceWlidPrefix,
+				level1:  "",
+				k:       "ClusterRoleBinding",
+				name:    "cartservice",
+			},
+			want: "wlid://cluster-HipsterShopCluster2/namespace-/clusterrolebinding-cartservice",
+			// FIXME: do we want "wlid://cluster-HipsterShopCluster2/clusterrolebinding-cartservice" instead?
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := generateWLID(tt.args.pLevel0, tt.args.level0, tt.args.pLevel1, tt.args.level1, tt.args.k, tt.args.name)
+			assert.Equal(t, tt.want, got)
+		})
+	}
+}