Link Rewriting

[Ronnie09]

I am trying to make a link rewriter which will open all external links(eg: google.com, facebook.com) in a new tab by default and all internal links(/content/....) in same tab. 

I am not sure how should I proceed for that. Need help

[Shiv_Prakash_Patel · Accepted solution]

Hi @Ronnie09 ,

We use Siglhty for Markup Rendering, Most of the manipulation or condition checks we do in JavaScript Code or Java Backend Code.

You can proceed with the below approach:

• In Sling Model, When we are checking for an internal( appending .html) link or external link and passing it to sightly.
• We can also pass flags true for internal and false for external to sightly.
• In Sightly use the data-sly-test tag for checking the condition, If it is true, Provide target ="_self", and for false provide target="_blank".

Hope this could help you !!!

Thanks

Shiv

[Dipti_Chauhan]

Hi @Ronnie09 

   Another option to could be you write your own Transformer (org.apache.sling.rewriter.Transformer) to update the links accordingly. However I still prefer doing it in sightly.

Thanks

Dipti

[arunpatidar]

Here here is the example

https://github.com/arunpatidar02/aem63app-repo/blob/master/java/CustomLinkChecker.java

Note: This is a global link rewriter, please restrict the link rewriter to your project itself using rewrite config.

e.g. https://adobe-consulting-services.github.io/acs-aem-commons/features/utils-and-apis/static-reference... 

[Ronnie09]

Hi @arunpatidar 

https://github.com/arunpatidar02/aem63app-repo/blob/master/java/CustomLinkChecker.java

Using is java class is enough or do I have to do something else?
Can you please guide how can I add target=_blank for external link

[arunpatidar]

Yes java is enough , you need to check if link is external and there is no target attribute and add target attribute at https://github.com/arunpatidar02/aem63app-repo/blob/f99cdbdd649423d8ee4bdbeafe0e840bdf99c97c/java/Cu... 

You also configure the pipeline at /apps/yourapp/config/rewriter, there you need to mentioned the pipeline name and path and other properties.

Below is the example of non global CustmLinkChecker

https://github.com/arunpatidar02/aemaacs-aemlab/blob/master/core/src/main/java/com/community/aemlab/... 

[Ronnie09]

Hi @arunpatidar 

How can I set target=_blank. I tried but it is asking for index not sure what to give and attributeimpl doesn't have target. 

[arunpatidar]

Hi,

You need to add target attribute to the attribute list

public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
		final AttributesImpl attributes = new AttributesImpl(atts);
                final int index =attributes.getLength();
                final String href = attributes.getValue("href");
		if (href != null && href.startsWith("/content/aemlab")) {
                    final String target = attributes.getValue("target");
                    if(target == null){
                     attributes.setAttribute(index, "","target","target", "CDATA","_blank");
                     }
		}
		contentHandler.startElement(uri, localName, qName, attributes);
	}

https://docs.oracle.com/javase/7/docs/api/org/xml/sax/helpers/AttributesImpl.html#setAttribute(int,%...

[Ronnie09]

@arunpatidar 

With above code I am getting arrayIndexout of bound exception

I tried with hrefindex but href is overwritten.

[arunpatidar]

Hi,

you need to use addAttribute method but not the set

public void addAttribute(String uri,
                String localName,
                String qName,
                String type,
                String value)

if(target == null){
                     attributes.setAttribute( "","target","target", "CDATA","_blank");
                     }

https://docs.oracle.com/javase/7/docs/api/org/xml/sax/helpers/AttributesImpl.html#addAttribute(java....