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sreedobe
sreedobe
Level 4
November 17, 2020
Solved

get component policy values in servlet

  • November 17, 2020
  • 4 replies
  • 4768 views

Component Dialog has "select" drop down that needs to read values set by author in "design dialog".

Following is the servlet that mapped to dialog select field using resourceType mapping. How to get get component policy values in servlet. 

 

I tried below but content resource coming as null 

 

Resource contentResource = resolver.getResource((String) request.getAttribute(Value.CONTENTPATH_ATTRIBUTE));

 

Thanks for any help. Below is the servlet code.

package com.company.aem.core.servlets; import com.adobe.granite.ui.components.Value; import com.adobe.granite.ui.components.ds.DataSource; import com.adobe.granite.ui.components.ds.EmptyDataSource; import com.adobe.granite.ui.components.ds.SimpleDataSource; import com.adobe.granite.ui.components.ds.ValueMapResource; import com.day.cq.wcm.api.policies.ContentPolicy; import com.day.cq.wcm.api.policies.ContentPolicyManager; import org.apache.sling.api.SlingHttpServletRequest; import org.apache.sling.api.SlingHttpServletResponse; import org.apache.sling.api.resource.Resource; import org.apache.sling.api.resource.ResourceMetadata; import org.apache.sling.api.resource.ResourceResolver; import org.apache.sling.api.resource.ValueMap; import org.apache.sling.api.servlets.SlingSafeMethodsServlet; import org.apache.sling.api.wrappers.ValueMapDecorator; import org.osgi.service.component.annotations.Component; import javax.servlet.Servlet; import javax.servlet.ServletException; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; /** * * Data source for links dropdown */ @Component(service = { Servlet.class }, property = { "sling.servlet.resourceTypes=" + AllowedArticleInsightsLinksServlet.RESOURCE_TYPE, "sling.servlet.methods=GET", "sling.servlet.extensions=html" }) public class AllowedArticleInsightsLinksServlet extends SlingSafeMethodsServlet { public final static String RESOURCE_TYPE = "pi-web/components/content/articleinsights/datasource/allowedlinks"; @Override protected void doGet( SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException { SimpleDataSource allowedHeadingElementsDataSource = new SimpleDataSource(getAllowedHeadingElements(request).iterator()); request.setAttribute(DataSource.class.getName(), allowedHeadingElementsDataSource); } private List < Resource > getAllowedHeadingElements(SlingHttpServletRequest request) { List < Resource > allowedHeadingElements = new ArrayList<>(); ResourceResolver resolver = request.getResourceResolver(); Resource contentResource = resolver.getResource((String) request.getAttribute(Value.CONTENTPATH_ATTRIBUTE)); ContentPolicyManager policyManager = resolver.adaptTo(ContentPolicyManager.class); if (policyManager != null && contentResource != null) { ContentPolicy policy = policyManager.getPolicy(contentResource); if (policy != null) { request.setAttribute(DataSource.class.getName(), EmptyDataSource.instance()); Resource allowedLinksResource = policy.adaptTo(Resource.class).getChild("links"); if (allowedLinksResource != null) { ValueMap vm = null; for (Resource rs : allowedLinksResource.getChildren()) { vm = new ValueMapDecorator(new HashMap<>()); // Specify the value and text values String Value = rs.getValueMap().get("linkhref", String.class); String Text = rs.getValueMap().get("linkname", String.class); //populate the map vm.put("value", Value); vm.put("text", Text); allowedHeadingElements.add( new ValueMapResource(resolver, new ResourceMetadata(), "nt:unstructured", vm)); } } } } return allowedHeadingElements; } }
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Best answer by Anudeep_Garnepudi

Hi @manjunath_k 

Can get ComponentContext from request.

ContentPolicyManager policyManager = resolver.adaptTo(ContentPolicyManager.class);
ComponentContext componentContxt = (ComponentContext) request.getAttribute("com.day.cq.wcm.componentcontext");
ContentPolicy policy = policyManager.getPolicy(componentContxt);

Hope it works!

AG

4 replies

Shubham_borole
Community Advisor
Shubham_boroleCommunity Advisor
Community Advisor
November 17, 2020

What is the value of (String)request.getAttribute(Value.CONTENTPATH_ATTRIBUTE) when you debug? We can check if its a valid resource path. May be if it has selector or something, we can try resolver.resolve(pathobtained)

Also check if the resolver has correct access, may be we need to use a admin user service resolver

    sreedobe
    sreedobeAuthor
    Level 4
    November 17, 2020
    It is not directly mapped to component but one of component dialog fields. that would we component/cq:dialog/items/item/field
    Anudeep_Garnepudi
    Community Advisor
    Anudeep_GarnepudiCommunity Advisor
    Community Advisor
    November 17, 2020

    Hi @sreedobe 

    Check your request has read access to the content path.

    AG

      Manjunath_K
      Manjunath_K
      Level 7
      November 17, 2020

      Hi @sreedobe 

      If its resource based servlet then you can access component policy configuration by passing current resource to getPolicy(). in below example component policy configuration has title field & same configured value is retrieved using ContentPolicyManager.

       

      ContentPolicyManager policyManager = request.getResourceResolver().adaptTo(ContentPolicyManager.class);
      if (policyManager != null) {
          ContentPolicy contentPolicy = policyManager.getPolicy(request.getResource()); //ex: request.getResource() path "/content/test-page/jcr:content/root/component"
          if (contentPolicy != null) {
              String title= contentPolicy.getProperties().get("title",String.class);
          }
      }

      refer this article:

      https://techrevel.blog/2017/08/28/aem-template-editor-design-configuration-via-policies/

       

       

      Hope this helps!

       

        sreedobe
        sreedobeAuthor
        Level 4
        November 17, 2020
        Here resource is not /component rather "/component/cq_dialog/items/item/field"
        Anudeep_Garnepudi
        Community Advisor
        Anudeep_GarnepudiCommunity AdvisorAccepted solution
        Community Advisor
        November 18, 2020

        Hi @manjunath_k 

        Can get ComponentContext from request.

        ContentPolicyManager policyManager = resolver.adaptTo(ContentPolicyManager.class);
        ComponentContext componentContxt = (ComponentContext) request.getAttribute("com.day.cq.wcm.componentcontext");
        ContentPolicy policy = policyManager.getPolicy(componentContxt);

        Hope it works!

        AG

          D
          DeepikaSh
          January 10, 2024

          Hi @anudeep_garnepudi, 
          I am facing similar issue in my below servlet code, trying to fetch the components in the accordion component dialog's dropdown field through a component policy (under path-/conf/project/settings/wcm/policies/project/components/content/accordion/policy_869306689481091), at line 23 the currentResouce is null. Could you help me on this ?


          @SlingServlet(paths = "/bin/project/authoring/accordionComponents",
          description = "This servlet will return the components configured in the component policy",
          methods = "GET",
          metatype = false)
          public class AccordionPolicyServlet extends SlingAllMethodsServlet {
          private static final long serialVersionUID = -4248132624511134604L;
          private static final Logger LOG = LoggerFactory.getLogger(AccordionPolicyServlet.class);

          /* (non-Javadoc)
          * @see org.apache.sling.api.servlets.SlingSafeMethodsServlet#doGet(org.apache.sling.api.SlingHttpServletRequest, org.apache.sling.api.SlingHttpServletResponse)
          */
          @Override
          protected void doGet(final SlingHttpServletRequest request, final SlingHttpServletResponse response)
          throws ServletException, IOException {
          LOG.info("Inside AccordionPolicyServlet");
          final String pagePath = request.getRequestURI();
          String contentPath = StringUtils.substringAfter(pagePath, "_cq_dialog.html");
          Resource currentResource = request.getResourceResolver().getResource(contentPath);
          String resourceType = StringUtils.substringAfterLast(currentResource.getResourceType(), "/");
          String accordNode = StringUtils.substringAfterLast(contentPath, "/");
          if (accordNode.contains(resourceType)) {
          contentPath = contentPath.replace(accordNode, resourceType);
          currentResource = request.getResourceResolver().getResource(contentPath);
          }
          final ContentPolicyManager policyManager = request.getResourceResolver().adaptTo(ContentPolicyManager.class);
          final List<Resource> optionResourceList = new ArrayList<Resource>();
          ValueMap vm = null;
          if (policyManager != null) {
          final ContentPolicy contentPolicy = policyManager.getPolicy(currentResource);
          if (contentPolicy != null) {
          final String[] components = (String[]) contentPolicy.getProperties().get("components");
          for (String componentPath : components) {
          vm = new ValueMapDecorator(new HashMap<String, Object>());
          final Resource componentRes = request.getResourceResolver().getResource(componentPath);
          vm.put("text", componentRes.getValueMap().get("jcr:title"));
          vm.put("value", componentPath);
          optionResourceList.add(new ValueMapResource(request.getResourceResolver(),
          new ResourceMetadata(), "nt:unstructured", vm));
          }
          }
          }
          final DataSource ds = new SimpleDataSource(optionResourceList.iterator());
          request.setAttribute(DataSource.class.getName(), ds);
          }
          }

          sreenu539
          sreenu539
          Level 7
          January 10, 2024

          If you are trying to access policy of a component.

           

          Do below:

           

          1) In scenario I had, servlet is called from datasource attribute in dialog xml dropdown.

           

          and in Servlet :

           

          Resource contentResource = request.getResourceResolver().getResource((String) request.getAttribute(Value.CONTENTPATH_ATTRIBUTE));

           

          ContrentPolicyManager policymanager = resolver.adaptTo(ContentPolicyManager.class);

           

          ContentPolicy policy = policyManager.getPolicy(contentResource);

           

          policy node will have policy details selected for that specific component at template level.

           

          you can also try manjunath, anudeep answers above as well

           

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