topic Re: Call a webscript within an Evaluator in Alfresco Archive

Call a webscript within an Evaluator

drocco88 — Thu, 04 Oct 2012 13:53:55 GMT

Hi all,I need to call a custom web script from my evaluator (java). I'm having some problems with authentication (calling a URL directly from Java). I tried with /alfresco/service, /alfresco/wcservice and /share/proxy/alfresco.Have someone done this before or have an idea on how to do it?Many thanks

Re: Call a webscript within an Evaluator

ddraper — Thu, 04 Oct 2012 15:45:06 GMT

What sort of evaluator are you referring to? A doc lib evaluator, a sub-component evaluator or an extension module evaluator? (or some other evaluator). For those 3 the solution will largely be the same. Get the the RequestContext (this is provided as an argument to the sub-component and extension module evaluators) or can be retrieved by calling ThreadLocalRequestContext.getRequestContext(); in a doc lib evaluator.

Then call:

Connector connector = context.getServiceRegistry().getConnectorService().getConnector("alfresco", userName, ServletUtil.getSession());
Response res = connector.call("<some-url>");

I'm assuming that you want to make a request to a WebScript on the repository?

Regards,
Dave

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 11:22:54 GMT

Is a doc lib evaluator.

I tried your suggestion (and also extending ServiceBasedEvaluator which basically calls the same) but I'm getting:

Web Script Status 500 - Internal Error
09050456 Access Denied. You do not have the appropriate permissions to perform this operation.

Re: Call a webscript within an Evaluator

ddraper — Fri, 05 Oct 2012 12:16:55 GMT

Slightly obvious question this one….. but DO you have the permissions to perform the operation? 😉

What WebScript are you calling and does the user you've logged in with have the authority to call the WebScript. Has the user actually been through an authentication step before the evaluator is called?

Regards,
Dave

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 12:24:09 GMT

Thanks Dave,

This is the flow:

The user login to share –> when he navigates the document library a custom evaluator is fired –> this evaluator calls a custom webscript (this webscript only check if a user belongs to a particular group).

What am I missing?

Re: Call a webscript within an Evaluator

ddraper — Fri, 05 Oct 2012 12:36:09 GMT

This seems to be a popular activity at the moment… I'm actually just writing exactly the same evaluator (with the logic shared between SubComponent, Module and DocLib evaluators). It will eventually make it's way onto HEAD but I'm not sure when… which WebScript are you calling to check group membership?

Regards,
Dave

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 13:08:19 GMT

One that I created which takes as parameters a username and groupname (must be called from different parts of share).

Can you please anticipate me how to get it working?

Many thanks,
Rocco

Re: Call a webscript within an Evaluator

ddraper — Fri, 05 Oct 2012 13:20:33 GMT

I'm using a repository WebScript accessed via:

/api/people/<user-name>?groups=true

This seems to be working fine. You can try it out by calling http://<share-server>:<share-port>/share/proxy/alfresco/api/people/<user-name>?groups=true (you need to have logged into Share before of course) to see how the membership information is returned. Why not try with that one rather than writing your own?

Regards,
Dave

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 13:36:06 GMT

I didn't know about that webscript

I tried but is not working either. The thing is that inside the evaluator I'm manually calling a java URL pointing to this webscript but I get the same 401 error for authentication.

Re: Call a webscript within an Evaluator

ddraper — Fri, 05 Oct 2012 13:39:12 GMT

If you're just creating a Java URL then how are you providing authentication credentials? Why not just use the code snippet I provided earlier in this thread as this will handle all the authentication issues for you.

Regards,
Dave

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 13:41:12 GMT

Sorry my bad was working from within the browser but not from java. I will try give me a couple of minutes.

Thanks 🙂

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 14:03:31 GMT

I got it working now 🙂

using your snippet the first time I didn't realize that the url as parameter for connector.call(url) has to be only "/api/people/…"

Thanks very much for your help Dave

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 14:11:50 GMT

Sorry a last quick question:

The response returns a String, is there a way to handle the response as a JSON object?

Re: Call a webscript within an Evaluator

ddraper — Fri, 05 Oct 2012 14:17:32 GMT

(Assuming you're using the WebScript I recommended) Try this:

org.json.simple.parser.JSONParser p = new org.json.simple.parser.JSONParser();
Object o = p.parse(response);
if (o instanceof org.json.simple.JSONObject)
{
    org.json.simple.JSONObject jsonRes = (org.json.simple.JSONObject) o;
    org.json.simple.JSONArray groupsList groupsList = (org.json.simple.JSONArray) jsonRes.get("groups");
    Iterator i = groupsList.iterator();
    while (i.hasNext())
    {                            
        org.json.simple.JSONObject group = (org.json.simple.JSONObject) i.next();
        String currGroupName = group.get("itemName").toString();
    }
}‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Call a webscript within an Evaluator

drocco88 — Fri, 05 Oct 2012 14:30:16 GMT

Awesome!

sorry if this was obvious but I recently started with Alfresco.

Hopefully in a couple of weeks it will be better.

Cheers

Re: Call a webscript within an Evaluator

ddraper — Fri, 05 Oct 2012 14:34:33 GMT

No problem… happy to help. At least you've found out what an awesome community Alfresco has