Call AEM Servlet based on asset path

Question

Hello All, Any thoughts on how can we call a servlet based on the asset path, say /content/dam/cms/assetpath.  If I want to load a servlet if we hit any asset under this path.   Thanks,Sateesh K.

EstebanBustamante · Accepted Answer

Technically you can register to any resource, but you cannot register a servlet by resourceType and specify the filter on it, instead, you could use a Sling servlet Filter, I would recommend exploring the Sling Filter first. Answering your question, the resource type to register an asset is "dam/Asset".

Another option could be to use a Workflow + WF Launcher to make sure a workflow is executed only under that asset.

Just for reference, this is how you will register the servlet for all the resources which are assets:

(service = { Servlet.class })
@SlingServletResourceTypes(
        resourceTypes="dam/Asset",
        methods=HttpConstants.METHOD_GET,
        extensions="txt")
@ServiceDescription("Simple Demo Servlet")
public class MyServlet extends SlingSafeMethodsServlet {
..
..
..

Then, you will invoke the servlet like this:

http://localhost:4502/content/dam/myasset.jpg.txt

Hope it helps