A Sling Rewriter Transformer that replaces all ".html" extensions in links within an HREF attribute of a requested page with "/".

LinkTransformer.java

package com.citytechinc.rewriter.linkchecker;

import java.io.IOException;

import org.apache.cocoon.xml.sax.AbstractSAXPipe;
import org.apache.sling.rewriter.ProcessingComponentConfiguration;
import org.apache.sling.rewriter.ProcessingContext;
import org.apache.sling.rewriter.Transformer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

import com.citytechinc.web.services.URLAdapter;

public class LinkTransformer extends AbstractSAXPipe implements Transformer {

    private static final Logger LOG = LoggerFactory.getLogger(LinkTransformer.class);

    private Boolean enableRemoveExtensions;
    private URLAdapter adapter;

    public LinkTransformer(final URLAdapter adapter) {
        enableRemoveExtensions = adapter != null
                && adapter.getOldExtensions() != null
                && adapter.getOldExtensions().size() > 0
                && adapter.getNewExtension() != null;

        LOG.info("LinkTransformer created. Enabled = " + enableRemoveExtensions);

        this.adapter = adapter;
    }

    @Override
    public void dispose() {

    }

    @Override
    public void init(final ProcessingContext context, final ProcessingComponentConfiguration config)
        throws IOException {
    }

    @Override
    public void startElement(final String uri, final String name, final String raw, final Attributes attrs)
        throws SAXException {

        final AttributesImpl attributes = new AttributesImpl(attrs);
        LOG.info("Processing element: " + raw);
        final String href = attributes.getValue("href");
        if (href != null && href.startsWith("/")) {
            LOG.info("Processing internal link href: " + href);

            for (int i = 0; i < attributes.getLength(); i++) {
                if ("href".equalsIgnoreCase(attributes.getQName(i))) {
                    attributes.setValue(i, enableRemoveExtensions ? removeExtension(href) : href);
                }
            }
        }

        super.startElement(uri, name, raw, attributes);
    }

    private String removeExtension(final String url) {
        return adapter.adaptUrl(url);
    }
}

LinkTransformerFactory.java

package com.citytechinc.rewriter.linkchecker;

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.rewriter.Transformer;
import org.apache.sling.rewriter.TransformerFactory;
import com.citytechinc.web.services.URLAdapter;

@Service(value = TransformerFactory.class)
@Component
public class LinkTransformerFactory implements TransformerFactory {

    @Property(
        value = "mylinktransformer",
        propertyPrivate = true)
    static final String PIPELINE_TYPE = "pipeline.type";

    @Reference
    private URLAdapter urlAdapter; // A class with one method that replaces ".html" with "/", given a URL.

    public final Transformer createTransformer() {
        return new LinkTransformer(urlAdapter);
    }
}

Hi Ryan,

How do I get the com.citytechinc.web.services.URLAdapter package?

Question, why do you iterate over the attributes even after null checking the value for href ? Wouldn't this be enough ?

      if (href != null && href.startsWith("/")) {
          LOG.info("Processing internal link href: " + href);
          attributes.setValue(i, enableRemoveExtensions ? removeExtension(href) : href);
      }

Hi Ryan, as ehurtarte asked you, can you give us the URLAdparter code?

Thanks

Regards,

Jorge