BE: RBAC: Subject type/value is unintended to be optional (#719)

Co-authored-by: Roman Zabaluev <gpg@haarolean.dev>

Author: wernerdv

api/src/main/java/io/kafbat/ui/model/rbac/Role.java

@@ -1,6 +1,7 @@
 package io.kafbat.ui.model.rbac;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkArgument;
+
 import java.util.List;
 import lombok.Data;
 
@@ -13,9 +14,11 @@ public class Role {
   List<Permission> permissions;
 
   public void validate() {
-    Preconditions.checkArgument(!clusters.isEmpty(), "Role clusters cannot be empty");
+    checkArgument(!clusters.isEmpty(), "Role clusters cannot be empty");
+    checkArgument(!subjects.isEmpty(), "Role subjects cannot be empty");
     permissions.forEach(Permission::transform);
     permissions.forEach(Permission::validate);
+    subjects.forEach(Subject::validate);
   }
 
 }

api/src/main/java/io/kafbat/ui/model/rbac/Subject.java

@@ -1,5 +1,8 @@
 package io.kafbat.ui.model.rbac;
 
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import io.kafbat.ui.model.rbac.provider.Provider;
 import lombok.Getter;
 
@@ -21,4 +24,12 @@ public void setType(String type) {
   public void setValue(String value) {
     this.value = value;
   }
+
+  public void validate() {
+    checkNotNull(type, "Subject type cannot be null");
+    checkNotNull(value, "Subject value cannot be null");
+
+    checkArgument(!type.isEmpty(), "Subject type cannot be empty");
+    checkArgument(!value.isEmpty(), "Subject value cannot be empty");
+  }
 }