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https://issues.apache.org/jira/browse/SLING-2803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13617467#comment-13617467
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Radu Cotescu commented on SLING-2803:
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I was also thinking to hook the Validation module using a SlingPostProcessor
implementation - it's probably the best place where we can validate the data -
but I wanted to wait for more seasoned Sling developers' suggestions.
Regarding the lack of a resource type: the post processor should be able to
identify the resource type before calling in the validation services. I thought
of these cases (for the sake of simplification of these examples I've omitted
to talk about the ":operation" parameter):
1. POST to a URL without any resource type parameter
- if the path exists, get the resource type from the repo (this POST is
essentially a modify operation) - a ValidationModel could be obtained
- if the path doesn't exist, we assume it's a create operation and the
resource type should be nt:unstructured - not sure what the Validation module
should do in this case
2. POST to a URL with a resource type parameter - again, we can obtain the
ValidationModel, if there is one
What are the other cases when we can't identify the resource type?
> Create a Validation module capable of validating POST requests or Resources
> ---------------------------------------------------------------------------
>
> Key: SLING-2803
> URL: https://issues.apache.org/jira/browse/SLING-2803
> Project: Sling
> Issue Type: New Feature
> Reporter: Radu Cotescu
>
> Several Sling users have asked in the past [1] about a Validation mechanism
> in Sling that's able to validate data coming from the user. However, such a
> module is still missing.
> This issue is meant to track the work progress on such a module.
> Ideally the module should be able to validate both request parameters and
> Resources, by obtaining their properties via a ValueMap and provide feedback
> in case of a validation error.
> [1] - http://sling.markmail.org/search/?q=validation
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