Added useful methods for ServiceTokenCredentialsSupplier

Author: artem-v

services-security/src/main/java/io/scalecube/services/security/ServiceTokenCredentialsSupplier.java

@@ -3,6 +3,7 @@
 import io.scalecube.security.vault.VaultServiceTokenSupplier;
 import io.scalecube.services.auth.CredentialsSupplier;
 import io.scalecube.services.exceptions.ForbiddenException;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -37,6 +38,27 @@ public ServiceTokenCredentialsSupplier(
     this.allowedRoles = allowedRoles;
   }
 
+  /**
+   * Clones this {@link ServiceTokenCredentialsSupplier} with given allowed roles.
+   *
+   * @param allowedRoles allowedRoles
+   * @return new instance
+   */
+  public ServiceTokenCredentialsSupplier forAllowedRoles(String... allowedRoles) {
+    return forAllowedRoles(Arrays.asList(allowedRoles));
+  }
+
+  /**
+   * Clones this {@link ServiceTokenCredentialsSupplier} with given allowed roles.
+   *
+   * @param allowedRoles allowedRoles
+   * @return new instance
+   */
+  public ServiceTokenCredentialsSupplier forAllowedRoles(Collection<String> allowedRoles) {
+    return new ServiceTokenCredentialsSupplier(
+        environment, vaultAddress, vaultTokenSupplier, allowedRoles);
+  }
+
   @Override
   public Mono<byte[]> credentials(String serviceName, List<String> serviceRoles) {
     return Mono.defer(