topic Re: Liferay JSR-168 (Portlets) and Web Scripts in Alfresco Archive

Liferay JSR-168 (Portlets) and Web Scripts

jett — Sun, 28 Dec 2008 15:58:08 GMT

I tried creating a portlet in Netbeans that references a Web Script in Alfresco. The webscript has not problems as I can "call" it directly from http://host/alfresco/services . When I deploy the portlet WAR file however, I am getting the following error message from the Tomcat log:15:45:17,921 INFO

Re: Liferay JSR-168 (Portlets) and Web Scripts

andrepra — Mon, 29 Dec 2008 10:00:01 GMT

I want to do the same thing. Can you tell me, please, where I can find the jar containing the WebScriptPortlet?

thanks
Andrea

Re: Liferay JSR-168 (Portlets) and Web Scripts

zstinah — Mon, 05 Jan 2009 14:53:19 GMT

alfresco-webscript-framework.jar
in \root\projects\webscript-framework\build\dist
in the alfresco source http://svn.alfresco.com/repos/alfresco-open-mirror/alfresco/HEAD

Re: Liferay JSR-168 (Portlets) and Web Scripts

jett — Tue, 06 Jan 2009 15:03:30 GMT

While searching for the a solution to this issue, I found an old (2007) presentation regarding integrating Liferay and Alfresco. Sent an email to the author of the presentation (Luis Sala from Alfresco) and got a response. I am sharing his response so the rest of us can benefit.

The presentation is outdated, not to mention that it doesn't include any code. Finally, I strongly discourage deploying Alfresco in its entirety into the portal. It was a mistake for our engineers to make that possible in the first place.

The best approach is where you develop a standalone portlet that invokes a Web Script on a remote Alfresco server.

I recently edited this article, which I think will help provide some hints and tips:
http://www.liferay.com/web/guest/community/wiki/-/wiki/Main/Alfresco+integration

Finally, I've attached two quick and dirty sample portlets that some friends drew up to demonstrate the use of the new CMIS API which are implemented within Alfresco as Web Scripts… One of them uses a straight XML parse the ATOM responses while the other uses the Abdera library.

There seems to be no way of attaching files in this forum so I am copying and pasting both sample portlet code.

the first one:


package training;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;

import javax.portlet.ActionRequest;
import javax.portlet.ActionResponse;
import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.PortletSecurityException;
import javax.portlet.PortletSession;
import javax.portlet.PortletURL;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

public class AlfrescoTrainingPortlet extends GenericPortlet {

   @Override
   protected void doView(RenderRequest request, RenderResponse response) throws PortletException, IOException {
      response.setContentType("text/html");
      
      HttpClient client = new HttpClient();
      client.getParams().setAuthenticationPreemptive(true);
      Credentials defaultcreds = new UsernamePasswordCredentials("admin", "admin");
      client.getState().setCredentials(AuthScope.ANY, defaultcreds);
      String url;
      
      String objectIdParam = (String) request.getPortletSession().getAttribute("objectId", PortletSession.PORTLET_SCOPE);
      if (objectIdParam == null) {
         url = "http://192.168.13.42:8080/alfresco/s/api/path/workspace/SpacesStore/Company%20Home/children";
      } else {
         url = "http://192.168.13.42:8080/alfresco/s/api/node/workspace/SpacesStore/" + objectIdParam + "/children";
      }
      
      GetMethod method = new GetMethod(url);
      client.executeMethod(method);
      
      PortletURL actionURL = response.createActionURL();
      
      PrintWriter writer = response.getWriter();
      try {
         Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(method.getResponseBodyAsStream());
         NodeList list = dom.getElementsByTagName("cmis:propertyId");
         int len = list.getLength();
         
         for (int i = 0; i < len; i++) {
            Element element = (Element) list.item(i);
            String propertyName = element.getAttribute("cmis:name");
            String objectId = null;
            if (propertyName.equals("ObjectId")) {
               objectId = element.getElementsByTagName("cmis:value").item(0).getTextContent();
               objectId = objectId.replaceAll("workspace://SpacesStore/", "");
               writer.println("<p>" + objectId);
            }
            if (objectId == null) {
               continue;
            }
            NodeList stringList = ((Element) element.getParentNode()).getElementsByTagName("cmis:propertyString");
            int stringSize = stringList.getLength();
            for (int j = 0; j < stringSize; j++) {
               Element strElem = ((Element) stringList.item(j));
               String strName = strElem.getAttribute("cmis:name");
               if (strName.equals("Name")) {
                  actionURL.setParameter("objectId", objectId);
                  writer.println("<a href='" + actionURL.toString() + "'>" + strElem.getTextContent() + "</a>");
                  break;
               }
            }
         }
      } catch (Exception exc) {
         exc.printStackTrace();
      }
      
      //response.getWriter().println(method.getResponseBodyAsString());
   }

   @Override
   public void processAction(ActionRequest request, ActionResponse response)
         throws PortletException, PortletSecurityException, IOException {
      String objectId = request.getParameter("objectId");
      if (objectId != null) {
         request.getPortletSession().setAttribute("objectId", objectId, PortletSession.PORTLET_SCOPE);
      }
   }
}
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second code (using Abdera)


package alf;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.Writer;
import java.net.URL;

import javax.portlet.GenericPortlet;
import javax.portlet.PortletException;
import javax.portlet.RenderRequest;
import javax.portlet.RenderResponse;
import javax.portlet.UnavailableException;

import org.apache.abdera.Abdera;
import org.apache.abdera.model.Document;
import org.apache.abdera.model.Entry;
import org.apache.abdera.model.Feed;
import org.apache.abdera.parser.Parser;
import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.GetMethod;

public class AlfPort extends GenericPortlet {

   @Override
   protected void doView(RenderRequest request, RenderResponse response)
         throws PortletException, IOException, UnavailableException {
      response.setContentType("text/html");
      HttpClient client = new HttpClient();
      client.getParams().setAuthenticationPreemptive(true);
      Credentials defaultCreds = new UsernamePasswordCredentials("admin","admin");
      client.getState().setCredentials(AuthScope.ANY, defaultCreds);
      
      GetMethod method = new GetMethod("http://192.168.13.42:8080/alfresco/s/api/path/workspace/SpacesStore/Company%20Home/children");
      client.executeMethod(method);
      //response.getWriter().println(method.getResponseBodyAsString());
      PrintWriter writer = response.getWriter();
      
      Abdera abdera = new Abdera();
      Parser parser = abdera.getParser();
        
      //URL url = new URL("http://192.168.13.42:8080/alfresco/s/api/path/workspace/SpacesStore/Company%20Home/children");
      Document<Feed> doc = parser.parse(method.getResponseBodyAsStream());
      Feed feed = doc.getRoot();
      writer.println(feed.getTitle());
      System.out.println(feed.getTitle());
      for (Entry entry : feed.getEntries()) {
         writer.println("\t" + entry.getTitle());
          System.out.println("\t" + entry.getTitle());
      }
   }
}
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Re: Liferay JSR-168 (Portlets) and Web Scripts

zstinah — Wed, 07 Jan 2009 11:17:50 GMT

Hi Jett

in your first post you are using the Web Script Framework in your portlet. Right?
Deploying a presentation web script as a portlet.

Do you (or anyone) have code samples using presentation web scripts communicating with a data webscript in Alfresco?
How they interact?

The code samples you shared use the CMIS API.

When should I use the CMIS API and when should I use the WSF? I am confused. Pros/cons?

I need to be able to search a remote alfresco repository for files of certain contenttype and then open/download that file if the user logged in has permission to do that.
From what I've read that should be an ideal job for the web script framework.

Regards

Re: Liferay JSR-168 (Portlets) and Web Scripts

jett — Thu, 08 Jan 2009 10:20:53 GMT

In my original post, I was attempting use Alfresco Webscripts JSR-168 runtime (http://wiki.alfresco.com/wiki/3.0_Web_Scripts_Framework#JSR-168_Runtime). Based on the documentation this seemed to be the easiest to implement as one would theoretically just create a Webscript which had both the controller/business logic and view/presentation. All one had to do for the Portal part is to "declare" the portlet in the xml config files (portlet.xml, liferay-portlet.xml, liferay-plugin-package.properties) I was however unable to get this approach to work and hence my posting of this topic.

I only needed to understand the concept in preparation for a POC we are about to create. In theory, here is what I was planning to do:

Webscript
1. create an Alfresco webscript and set the response format to either "html" or "portlet" (refer to http://wiki.alfresco.com/wiki/3.0_Web_Scripts_Framework#HTTP_Response_Formats) in the description configuration file (.desc.xml) for the Webscript.

Portlet
From the portlet, one just needs to "call" the Webscript from the Portlet (example is in the code from Luis).

This requires portlet to authenticate with Alfresco first. There are 2 options:
a. use HTTP basic authentication - the sample code does this exactly using httpclient.Credentials
b. pass an alf_ticket request parameter to the URL of your webscript call (http://wiki.alfresco.com/wiki/Web_Scripts#Authenticating). If you chose this method, you would need to login first by calling Alfresco's Login REST API service (http://wiki.alfresco.com/wiki/2.1_REST_API#Login)

** In my case for SSO functionality, we will be using the user's Liferay username and password. To authenticate, I will be using a couple of methods in Liferay's PortalUtil class (com.liferay.portal.util.PortalUtil) to get the current user's login credentials.
*** I think authentication (or getting alf_ticket) needs to be done only once and it should work for subsequent calls so this may be done once user logs into Liferay.

Assuming that authentication is ok, the webscript should return an output depending on the response format set for the Webscript (html or portlet in our case). Whatever output is retrieved will be written to the portlet using writer. Assuming method is a httpclient.methods.GetMethod object, it should be as simple as:

response.getWriter().println(method.getResponseBodyAsString());

Again this is purely theoretical until I actually get to write the code. Other suggestions/thoughts are definitely welcome.

Re: Liferay JSR-168 (Portlets) and Web Scripts

zstinah — Thu, 08 Jan 2009 11:12:45 GMT

Thank you for your answer. It helps alot.

Seems we are planning similar things but everything still just in theory In theory our plans should all be a piece of pie according to the wikis!

Would be nice to know if there are people out there that have this thing actually working

Regards

Re: Liferay JSR-168 (Portlets) and Web Scripts

alovell — Tue, 10 Feb 2009 11:39:17 GMT

Hi folks,

Has anyone been able to make any advances on this? I've been trying to do exactly this without much success.

All the Best

Andy Lovell

Re: Liferay JSR-168 (Portlets) and Web Scripts

rivetlogic — Mon, 22 Jun 2009 19:06:51 GMT

Hi,

You could try AWPr (http://forge.rivetlogic.com/Forge/Rivets/Alfresco-Web-script-Portlet). I'm not sure if this will satisfy your requirements but it's a possible option.

Hope this helps,

–Alaaeldin

Re: Liferay JSR-168 (Portlets) and Web Scripts

anusk — Tue, 15 Jun 2010 10:28:32 GMT

Hi!
I know is an old post, but i'm trying to achieve the same and appears the same error.

java.lang.NullPointerException
 at org.springframework.extensions.webscripts.portlet.WebScriptPortlet.init(WebScriptPortlet.java:80)
‍‍‍

I am using Liferay 6 and Alfresco 3.3.
Did anyone find the solution? because I'm really stuck at this point.

Thanks in advance.
Ana

Re: Liferay JSR-168 (Portlets) and Web Scripts

berenicestr69 — Thu, 05 Aug 2010 10:14:13 GMT

Hello, I´m trying to conect from a portlet in Liferay to Alfresco with a Web Script.

I have problems from the portlet to doywload a document, i generate a ticket, but when i try to download appears the page for login in Alfresco after to download the document.

I try creating credentials in the porltet for the autentication but don´t do nothing, appears the page for login in Alfresco.

I post the code, if somewone see the error, or how can i solved for download the document from the repository of Alfresco and don´t have to login in Alfresco.

Thanks for yur help.

@Override
   protected void doView(RenderRequest request, RenderResponse response)
         throws PortletException, IOException {

      response.setContentType("text/html");
      String ipServidorAlfresco="localhost";
        String user="admin";
        String password="123456";



        HttpClient client = new HttpClient();
        client.getParams().setAuthenticationPreemptive(true);
        Credentials defaultCreds = new UsernamePasswordCredentials(user,password);
        client.getState().setCredentials(AuthScope.ANY, defaultCreds);

        String url;


        String urlRaiz="/Company%20Home/documentos/";



           String ticket=crearTicket(user,password,ipServidorAlfresco);
         String ticketUser=parsearXMLTicket(ticket);
         String urlDocumentos = "http://'+ipServidorAlfresco+':8080/alfresco/service/documentosalfresco?alf_ticket='+ticketUser+'&carpeta='+urlRaiz+"";

           GetMethod method = new GetMethod(urlDocumentos);
              client.executeMethod(method);


      System.out.println(urlDocumentos);
      URL urlDoc = new URL(urlDocumentos);
      urlDoc.openConnection();
      InputStream source2 = urlDoc.openStream();
      String data = readInputStreamAsString(source2);
      PrintWriter out = response.getWriter();
      String urlpagina=recuperarUrl(request);
      System.out.print(urlpagina);

      out.print(data);
      out.println(urlpagina);

   }