Update client license etag to handle new features (#2716)

utils/license.go

@@ -5,11 +5,13 @@ package utils
 
 import (
 	"crypto"
+	"crypto/md5"
 	"crypto/rsa"
 	"crypto/sha512"
 	"crypto/x509"
 	"encoding/base64"
 	"encoding/pem"
+	"fmt"
 	"strconv"
 	"strings"
 
@@ -129,3 +131,13 @@ func getClientLicense(l *model.License) map[string]string {
 
 	return props
 }
+
+func GetClientLicenseEtag() string {
+	value := ""
+
+	for k, v := range ClientLicense {
+		value += fmt.Sprintf("%s:%s;", k, v)
+	}
+
+	return model.Etag(fmt.Sprintf("%x", md5.Sum([]byte(value))))
+}

utils/license_test.go

@@ -48,3 +48,21 @@ func TestValidateLicense(t *testing.T) {
 		t.Fatal("should have failed - bad license")
 	}
 }
+
+func TestClientLicenseEtag(t *testing.T) {
+	etag1 := GetClientLicenseEtag()
+
+	ClientLicense["SomeFeature"] = "true"
+
+	etag2 := GetClientLicenseEtag()
+	if etag1 == etag2 {
+		t.Fatal("etags should not match")
+	}
+
+	ClientLicense["SomeFeature"] = "false"
+
+	etag3 := GetClientLicenseEtag()
+	if etag2 == etag3 {
+		t.Fatal("etags should not match")
+	}
+}