[jira] [Commented] (SLING-9898) Support interpolation in Context-Aware Configuration

["Stefan Seifert (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SLING-9898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17460885#comment-17460885 ] 

Stefan Seifert commented on SLING-9898:
---------------------------------------

here is an example of using the already existing OsgiConfigurationOverrideProvider to apply caconfig via environment variables using placeholders via the felix interpolation:

{{org.apache.sling.caconfig.impl.override.OsgiConfigurationOverrideProvider~siteconfig.cfg.json}}
{code:json}
{
  "description": "Author/Publish hostnames for URL externalization",
  "overrides": [
    "io.wcm.handler.url.SiteConfig={\"siteUrlAuthor\":\"$[env:CMS_AEM_AUTHOR_URL;default=]\",\"siteUrl\":\"$[env:CMS_AEM_PUBLISH_URL;default=]\"}"
  ],
  "enabled": true
}
{code}

i'm very hesitant adding interpolation support directly to caconfig. this get's really complex for non-string data types, and we have to introduce a failsafe and backward-compatible placeholder (and fallback) syntax. this is another level of inheritance and fallback which makes caconfig itself even complexer (and it's already a bit over-complex). so, i'm fine with the current solution of "separated concerns" - interpolation from env variables is only supported in osgi config, and we can chain that together with and override provider.


> Support interpolation in Context-Aware Configuration
> ----------------------------------------------------
>
>                 Key: SLING-9898
>                 URL: https://issues.apache.org/jira/browse/SLING-9898
>             Project: Sling
>          Issue Type: New Feature
>    Affects Versions: Context-Aware Configuration Impl 1.5.0
>            Reporter: Konrad Windszus
>            Priority: Major
>             Fix For: Context-Aware Configuration Impl 1.6.0
>
>
> Similar to https://issues.apache.org/jira/browse/SLING-7768 and https://github.com/apache/felix-dev/blob/master/configadmin-plugins/interpolation/README.md Context-Aware configurations should support interpolating values from at least environment variables.
> Although a similar behaviour could probably be achieved with a new Override Provider (https://sling.apache.org/documentation/bundles/context-aware-configuration/context-aware-configuration-override.html#built-in-override-providers), it would require a level of indirection. 
> This feature is about directly referencing external values inside the Context-Aware Configuration.



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