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Tenu
Level 2
June 19, 2023
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AEM Workflow PDF Metadata

  • June 19, 2023
  • 2 replies
  • 1970 views

Hello, I have a workflow in AEM that is responsible for cleaning the metadata of my PDFs in the DAM. The issue is that it doesn't delete all the metadata; it seems to only delete it from the environment but not from the document when I download it again. It also appears that the XMP metadata persists. Any help or solution? I tried cleaning the metadata node or deleting it, but in both cases, due to configuration, I get a message saying that the node is protected and cannot be accessed. Greetings. My workflow that "works a bit".

package com.unicaja.aem.site.core.workflow; import java.util.HashMap; import java.util.Map; import java.util.regex.Matcher; import java.util.regex.Pattern; import javax.jcr.Session; import org.apache.sling.api.resource.LoginException; import org.apache.sling.api.resource.ModifiableValueMap; import org.apache.sling.api.resource.PersistenceException; import org.apache.sling.api.resource.Resource; import org.apache.sling.api.resource.ResourceResolver; import org.apache.sling.api.resource.ResourceResolverFactory; import org.apache.sling.api.resource.ValueMap; import org.osgi.framework.Constants; import org.osgi.service.component.annotations.Component; import org.osgi.service.component.annotations.Reference; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.adobe.granite.workflow.WorkflowException; import com.adobe.granite.workflow.WorkflowSession; import com.adobe.granite.workflow.exec.WorkItem; import com.adobe.granite.workflow.exec.Workflow; import com.adobe.granite.workflow.exec.WorkflowProcess; import com.adobe.granite.workflow.metadata.MetaDataMap; @Component(service = WorkflowProcess.class, property = { Constants.SERVICE_DESCRIPTION + "= Remove Metas PDF Proccess", Constants.SERVICE_VENDOR + "= Adobe", "process.label=" + "Remove Metas PDF Proccess" }) public class RemoveMetas implements WorkflowProcess { @3214626 private ResourceResolverFactory resolverFactory; /** Default log. */ protected final Logger log = LoggerFactory.getLogger(this.getClass()); public void execute(WorkItem item, WorkflowSession wfsession, MetaDataMap args) throws WorkflowException { try { Session session = wfsession.adaptTo(Session.class); final Map<String, Object> map = new HashMap<>(); map.put("user.jcr.session", session); ResourceResolver rr = resolverFactory.getResourceResolver(map); String path = item.getWorkflowData().getPayload().toString(); Resource resource; Pattern regexExpression = Pattern.compile(".*/jcr:content/metadata.*"); Matcher match = regexExpression.matcher(path); if(match.matches()){ resource = rr.getResource(path); } else { resource = rr.getResource(path + "/jcr:content/metadata"); } ValueMap vm = resource.getValueMap(); if (vm.get("dc:format").equals("application/pdf")) { for (String key : vm.keySet()) { if (!key.equals("jcr:mixinTypes") && !key.equals("jcr:primaryType") && !key.equals("dc:format") && !key.equals("dateHR") && !key.equals("jcr:title") && !key.equals("pdf:Title") && !key.equals("dc:title") && !key.equals("dc:description") && !key.equals("cq:tags")) { ModifiableValueMap map1 = resource.adaptTo(ModifiableValueMap.class); if (map1 != null) { map1.remove(key); } } } resource.getResourceResolver().commit(); } } catch (LoginException | PersistenceException e) { log.error("Error {}", e.getMessage()); } finally { Workflow workflow = wfsession.getWorkflow(item.getWorkflow().getId()); wfsession.terminateWorkflow(workflow); } } }

 

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Best answer by Tanika02

Hello @tenu 

 

Could you please try below implementation, if this is able to fix the issue ? 

 

  • The XMP metadata is stored within the PDF file is separate from the metadata stored in the DAM asset's metadata node.

 

 

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Session;

import org.apache.commons.io.IOUtils;
import org.apache.jackrabbit.commons.JcrUtils;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.resource.ResourceResolverFactory;
import org.osgi.framework.Constants;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.adobe.granite.workflow.WorkflowException;
import com.adobe.granite.workflow.WorkflowSession;
import com.adobe.granite.workflow.exec.WorkItem;
import com.adobe.granite.workflow.exec.Workflow;
import com.adobe.granite.workflow.exec.WorkflowData;
import com.adobe.granite.workflow.exec.WorkflowProcess;
import com.adobe.granite.workflow.metadata.MetaDataMap;
import com.day.cq.dam.api.Asset;
import com.day.cq.dam.api.DamConstants;
import com.day.cq.dam.commons.util.AssetReferenceSearch;
import com.day.cq.dam.commons.util.DamUtil;
import com.day.cq.dam.commons.util.UIHelper;

@Component(service = WorkflowProcess.class, property = {
Constants.SERVICE_DESCRIPTION + "=Remove Metas PDF Process",
Constants.SERVICE_VENDOR + "=Adobe",
"process.label=Remove Metas PDF Process"
})
public class RemoveMetas implements WorkflowProcess {

private static final Logger log = LoggerFactory.getLogger(RemoveMetas.class);

@Reference
private ResourceResolverFactory resolverFactory;

@Override
public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap args)
throws WorkflowException {
ResourceResolver resourceResolver = null;
try {
Session session = workflowSession.adaptTo(Session.class);
resourceResolver = resolverFactory.getResourceResolver(
UIHelper.getAuthInfoMap(session));

WorkflowData workflowData = workItem.getWorkflowData();
String path = workflowData.getPayload().toString();

Asset asset = DamUtil.resolveToAsset(resourceResolver.getResource(path));

if (asset != null && DamUtil.isSupportedAsset(asset)) {
removeMetadataFromDAM(asset);
removeMetadataFromPDF(asset, resourceResolver);
resourceResolver.commit();
} else {
log.error("Invalid asset or unsupported asset type: {}", path);
}
} catch (Exception e) {
log.error("Error removing metadata from PDF: {}", e.getMessage());
} finally {
if (resourceResolver != null && resourceResolver.isLive()) {
resourceResolver.close();
}
}
}

private void removeMetadataFromDAM(Asset asset) throws RepositoryException {
Node assetNode = asset.adaptTo(Node.class);
if (assetNode != null && assetNode.hasNode(DamConstants.METADATA_FOLDER)) {
Node metadataNode = assetNode.getNode(DamConstants.METADATA_FOLDER);
metadataNode.remove();
}
}

private void removeMetadataFromPDF(Asset asset, ResourceResolver resourceResolver) throws IOException {
InputStream inputStream = null;
OutputStream outputStream = null;
try {
inputStream = asset.getOriginal().getStream();
outputStream = asset.getOriginal().getStream();
AssetReferenceSearch assetReferenceSearch = new AssetReferenceSearch(resourceResolver);
assetReferenceSearch.add(new AssetReferenceSearch.AssetReference(asset));
assetReferenceSearch.removeMetadata(inputStream, outputStream);
} finally {
IOUtils.closeQuietly(inputStream);
IOUtils.closeQuietly(outputStream);
}
}
}

2 replies

Nishant-Singh
Adobe Employee
Nishant-SinghAdobe Employee
Adobe Employee
June 19, 2023

It seems resource resolver issue. if you are using "rr" resource resolver then use the same for commit method. 

    T
    TenuAuthor
    Level 2
    June 19, 2023

    I notice that if I delete the metadata in AEM when looking at the CRX, but if I download the file it still has metadata and XMP saved

      Nishant-Singh
      Adobe Employee
      Nishant-SinghAdobe Employee
      Adobe Employee
      June 19, 2023

      AEM only extract the XMP data from the PDF file and store in metadata node. you can delete rom AEM node but if you want to delete XMP data from the PDF document itself then you will have to write custom code to do that. 

       

      Example : https://stackoverflow.com/questions/21295420/pdf-metadata-removal-using-java

        Tanika02
        Tanika02Accepted solution
        Level 7
        June 19, 2023

        Hello @tenu 

         

        Could you please try below implementation, if this is able to fix the issue ? 

         

        • The XMP metadata is stored within the PDF file is separate from the metadata stored in the DAM asset's metadata node.

         

         

        import java.io.IOException;
        import java.io.InputStream;
        import java.io.OutputStream;

        import javax.jcr.Node;
        import javax.jcr.RepositoryException;
        import javax.jcr.Session;

        import org.apache.commons.io.IOUtils;
        import org.apache.jackrabbit.commons.JcrUtils;
        import org.apache.sling.api.resource.Resource;
        import org.apache.sling.api.resource.ResourceResolver;
        import org.apache.sling.api.resource.ResourceResolverFactory;
        import org.osgi.framework.Constants;
        import org.osgi.service.component.annotations.Component;
        import org.osgi.service.component.annotations.Reference;
        import org.slf4j.Logger;
        import org.slf4j.LoggerFactory;

        import com.adobe.granite.workflow.WorkflowException;
        import com.adobe.granite.workflow.WorkflowSession;
        import com.adobe.granite.workflow.exec.WorkItem;
        import com.adobe.granite.workflow.exec.Workflow;
        import com.adobe.granite.workflow.exec.WorkflowData;
        import com.adobe.granite.workflow.exec.WorkflowProcess;
        import com.adobe.granite.workflow.metadata.MetaDataMap;
        import com.day.cq.dam.api.Asset;
        import com.day.cq.dam.api.DamConstants;
        import com.day.cq.dam.commons.util.AssetReferenceSearch;
        import com.day.cq.dam.commons.util.DamUtil;
        import com.day.cq.dam.commons.util.UIHelper;

        @Component(service = WorkflowProcess.class, property = {
        Constants.SERVICE_DESCRIPTION + "=Remove Metas PDF Process",
        Constants.SERVICE_VENDOR + "=Adobe",
        "process.label=Remove Metas PDF Process"
        })
        public class RemoveMetas implements WorkflowProcess {

        private static final Logger log = LoggerFactory.getLogger(RemoveMetas.class);

        @Reference
        private ResourceResolverFactory resolverFactory;

        @Override
        public void execute(WorkItem workItem, WorkflowSession workflowSession, MetaDataMap args)
        throws WorkflowException {
        ResourceResolver resourceResolver = null;
        try {
        Session session = workflowSession.adaptTo(Session.class);
        resourceResolver = resolverFactory.getResourceResolver(
        UIHelper.getAuthInfoMap(session));

        WorkflowData workflowData = workItem.getWorkflowData();
        String path = workflowData.getPayload().toString();

        Asset asset = DamUtil.resolveToAsset(resourceResolver.getResource(path));

        if (asset != null && DamUtil.isSupportedAsset(asset)) {
        removeMetadataFromDAM(asset);
        removeMetadataFromPDF(asset, resourceResolver);
        resourceResolver.commit();
        } else {
        log.error("Invalid asset or unsupported asset type: {}", path);
        }
        } catch (Exception e) {
        log.error("Error removing metadata from PDF: {}", e.getMessage());
        } finally {
        if (resourceResolver != null && resourceResolver.isLive()) {
        resourceResolver.close();
        }
        }
        }

        private void removeMetadataFromDAM(Asset asset) throws RepositoryException {
        Node assetNode = asset.adaptTo(Node.class);
        if (assetNode != null && assetNode.hasNode(DamConstants.METADATA_FOLDER)) {
        Node metadataNode = assetNode.getNode(DamConstants.METADATA_FOLDER);
        metadataNode.remove();
        }
        }

        private void removeMetadataFromPDF(Asset asset, ResourceResolver resourceResolver) throws IOException {
        InputStream inputStream = null;
        OutputStream outputStream = null;
        try {
        inputStream = asset.getOriginal().getStream();
        outputStream = asset.getOriginal().getStream();
        AssetReferenceSearch assetReferenceSearch = new AssetReferenceSearch(resourceResolver);
        assetReferenceSearch.add(new AssetReferenceSearch.AssetReference(asset));
        assetReferenceSearch.removeMetadata(inputStream, outputStream);
        } finally {
        IOUtils.closeQuietly(inputStream);
        IOUtils.closeQuietly(outputStream);
        }
        }
        }

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