Allow deletion of system VM templates (apache#8556)

* allow delete system VM templates

* Add isSystem parameter

* add authorized

---------

Co-authored-by: Gabriel <gabriel.fernandes@scclouds.com.br>

Author: GaOrtiga

api/src/main/java/org/apache/cloudstack/api/command/user/template/DeleteTemplateCmd.java

@@ -18,6 +18,7 @@
 
 import org.apache.commons.lang3.BooleanUtils;
 
+import org.apache.cloudstack.acl.RoleType;
 import org.apache.cloudstack.api.APICommand;
 import org.apache.cloudstack.api.ApiCommandResourceType;
 import org.apache.cloudstack.api.ApiConstants;
@@ -56,6 +57,9 @@ public class DeleteTemplateCmd extends BaseAsyncCmd {
     @Parameter(name=ApiConstants.DESKTOP_CHECK, type = CommandType.BOOLEAN, required=false, description="Verify that it is a desktop template.")
     protected Boolean isDesktop;
 
+    @Parameter(name = ApiConstants.IS_SYSTEM, type = CommandType.BOOLEAN, required = false, description = "Necessary if the template's type is system.", since = "4.20.0", authorized = {RoleType.Admin})
+    private Boolean isSystem;
+
     /////////////////////////////////////////////////////
     /////////////////// Accessors ///////////////////////
     /////////////////////////////////////////////////////
@@ -83,6 +87,10 @@ public Boolean isDesktop() {
     public void setIsDesktop(Boolean isDesktop) {
         this.isDesktop = isDesktop;
     }
+    
+    public boolean getIsSystem() {
+        return BooleanUtils.toBooleanDefaultIfNull(isSystem, false);
+    }
 
     /////////////////////////////////////////////////////
     /////////////// API Implementation///////////////////

server/src/main/java/com/cloud/template/HypervisorTemplateAdapter.java

@@ -752,8 +752,8 @@ void checkAndRemoveTemplateDetails(VMTemplateVO template) {
     public TemplateProfile prepareDelete(DeleteTemplateCmd cmd) {
         TemplateProfile profile = super.prepareDelete(cmd);
         VMTemplateVO template = profile.getTemplate();
-        if (template.getTemplateType() == TemplateType.SYSTEM) {
-            throw new InvalidParameterValueException("The DomR template cannot be deleted.");
+        if (template.getTemplateType() == TemplateType.SYSTEM && !cmd.getIsSystem()) {
+            throw new InvalidParameterValueException("Could not delete template as it is a SYSTEM template and isSystem is set to false.");
         }
         checkZoneImageStores(profile.getTemplate(), profile.getZoneIdList());
         return profile;