Need help with rule (script) to set document as read only

[Scorpios]

I have a document that goes through various reviews and then when the final review is approved I want to set the permisions of the document to read-only. I have the rule calling my javascript code and it works for administrators but does not work for normal (non-admin) users. Normal users when the rule runs I see this error in the log: 

Access Denied. You do not have the appropriate permissions to perform this operation.

Is there a way for a nomal user to be able to set the permissions of the document to read-only

or in the script give them elevated privlidges temporarlity to set the permisions.

This is my code fragment:

    //

    // Set the Permission we want    

    //      Alfrseco Admins Delete

    //       Everyone Read-Only

    //

    document.setPermission("Delete", "GROUP_ALFRESCO_ADMINISTRATORS");

    document.setPermission("Read", "GROUP_EVERYONE");

    //

    // Stop inherting permissions

    //

    document.setInheritsPermissions(false);

Thank You

[angelborroy · Accepted solution]

It's tricky, but you can do something similar to:

https://angelborroy.wordpress.com/2015/07/24/alfresco-run-as-system-admin-user-without-credentials/

>> From JavaScript (server side)

[Scorpios]

Thank you I saw that article and the one that it referred to also.

The code looks straight foward.

What I didn't see what where to put the Java file and where to put the XML files.

From https://docs.alfresco.com/4.1/tasks/ext-file-config.html

I think I know where the XML file would go. 

Still looking for where the Java file would go.

[Scorpios]

I think I found where the XML file would go from this page

https://docs.alfresco.com/4.1/tasks/ext-file-config.html

Still looking for where the Java code would go.

[sanjaybandhaniya]

You have to use customization for that.

Please use sdk for customization.