Saturday, July 18, 2020

Configure Sling Mapping for Resource Resolution in Adobe Experience Manager — Deep Dive

This tutorial explains the complete details on configuring sling mapping for resource resolution in Adobe Experience Manager.
Resource mapping is used to define the content mapping and redirects in AEM.
I have enabled two sample domains www.example1.com and www.example2.com pointing to /content/wknd/us/en and /content/wknd/ca/en nodes respectively(sample wknd website nodes).
The flow is as below


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The user request for www.example1.com and www.example2.com, the Apache redirects the user to the domain specific landing pages and also redirect the user to the shortened URL(hide/content/wknd/<country code> if user access the page with full content path). The dispatcher pass through the shortened content URL’s to publisher by appending the full content path /content/wknd/<country code>
As first step let us enable the virtual host configurations for www.example1.com and www.example2.com in Apache(Dispatcher)
“DispatcherUseProcessedURL on” configuration should be enabled in dispatcher configuration to enable the Pass Through URL’s to work
e.g
Now both the domains www.example1.com and www.example2.com are accessible, this will display the mapped landing page content but the internal page links still point to the complete URL(/content/wknd/<<country code>>)


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Let us now enable the run mode specific(my case the server is enabled with additional run mode “dev”) ResourceResolver configuration — “Apache Sling Resource Resolver Factory” to reverse map the internal full content path to the shortened URL— enable the mapping for all the required content paths.


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Now the internal page links are transformed to shortened URL based on the URL mappings in the Resource Resolver.


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This approach has multiple draw backs —
  • the mapping don’t supports the regex expressions
  • it doesn’t support cross-site links because this rewriting method is not domain-aware
  • reverse map the content path to the corresponding domain wont work
The incoming URL will be resolved without any issue as the dispatcher always send the complete path(e.g /content/wknd/us/en.html) to the publisher — http://localhost:4503/system/console/jcrresolver.


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The content path is not reversed mapped to the domain URL


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This will create issues while supporting multiple domains in the AEM platform and need to link the pages between sites(the components should identify the domain corresponding to the content path while linking the pages from different sites — ResourceResolver.map(…))
We should use the etc mapping to enable the forward resolving(resolve the incoming URL to content path) and reverse mapping (map the content path to the domain)
As a first step create an environment specific mapping folder (sling:Folder)— /etc/map.dev.publish, the etc mapping configurations won’t honor the run mode but it is possible to enable the environment specific configuration by enabling different folders e.g map.dev.publish, map.uat.publish, map.stage.publish and map.prod.publish and configure the folder to the run mode specific JCR Resolver configuration( “Apache Sling Resource Resolver Factory”).
Create a folder http or https(sling:Folder) under map.dev.publish based on the protocol used to communicate to publisher, use https even the SSL is terminated at load balancer level — the mapping details can be stored to code repository for better management.


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Enable the below Sling Mappings under /etc/map.dev.publish /http(s) based on the protocol used— this will enable the forward mapping(resolve) — map the incoming URL to the content path(forward mapping is optional as the dispatcher is already sending the complete content path to publisher) and reverse mapping (map)— map the content path to shortened DNS URL.


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Now the forward and reverse mapping works as expected


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The resolve and map methods of org.apache.sling.api.resource.ResourceResolver interface can be used to resolve/map the resources in java services/components.
Let us now enable some additional sling mappings
Resolve(Forward Mapping) the specific incoming URL to a different content path.
e.g the incoming request to the sitemap.xml file should be internally mapped to a different location where the file is located(under /content/wknd)
Create a node sitemap_mapping of type “sling:Mapping” under /etc/map.dev.publish/www.example1.com and add the below properties


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Now the request to sitemap.xml — http://www.example.com/sitemap.xml displays the content from /content/wknd/sitemap.xml(enabled sample sitemap.xml file under /content/wknd)


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Multiple forward mappings can be created as required for the specific domain.
Reverse Map the URLs to remove the .html extension from the page links
Let us now enable additional reverse mapping to remove the html extension from internal page links.
Create a node reverse_no_html of type “sling:Mapping” under /etc/map.dev.publish/www.example1.com and add the below properties


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Multiple reverse mappings can be created as required for the specific domain.
Enable external redirects for specific URL’s
Let us now enable a external redirect, redirect the request with string “test” to a external URL — https://albinsblog.com
Create a node external_redirect of type “sling:Mapping” under /etc/map.dev.publish/www.example1.com and add the below properties


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Now the URL http://www.example1.com/test.html will be redirected to https://www.albinsblog.com
The jcr package can be downloaded from the below link

References




The sling mapping helps us to map the incoming request to the internal content path and at the same time map the internal content path to the complete DNS based shortened URL. This will enable the AEM platform to support multi tenants and allows the author to cross link the websites just through the content path(AEM automatically maps the content path to the domain URL)


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