Is there a way to set content permission on Confluence 8?

Confluence Development Confluence Server
1

Hi there,

We have a plugin that provides REST API for setting content permissions.
Previously, with Confluence 7 we used ContentEntityManagerInternal in conjunction with ContentPermissionManager:

        ContentEntityObject contentObject = contentEntityManager.getById(ContentId.of(pageId));
        ...
        contentPermissionManager.setContentPermissions(resultingPermissionsMap, contentObject);

Now we are getting ready to upgrade to Confluence 8.5. The problem we faced is, ContentEntityManagerInternal seems to no longer be available, failing with:

Unsatisfied requirement: (&(package=com.atlassian.confluence.internal))

Probably, due to this:

com.atlassian.confluence.internal (Atlassian Confluence 6.2.0 API) - Internal interfaces that are NOT exposed to the plugin classpath, by being excluded in the packageScanningConfiguration of bootstrapContext.xml. This allows us to slowly reduce the surface area of confluence-core as an API, now that we are intentionally exposing an official API in confluence-java-api.

The suggested way of getting content by ID seems to be using the ContentService, so we figured this would do the job:

        Content content = contentService.find()
                .withStatus(ContentStatus.CURRENT)
                .withId(ContentId.of(pageId))
                .fetch()
                .orElseThrow(notFound("No content found with id : " + pageId));

And it does! The problem is, it returns the com.atlassian.confluence.api.model.content.Content object, while ContentPermissionManaget expects com.atlassian.confluence.core.ContentEntityObject.

So, we need either a way of getting a ContentEntityObject some other way, or set permissions some other way.

I would appreciate any suggestions on how to do this using the current Confluence APIs.