[wp-trac] [WordPress Trac] #50620: REST API: regression after introducing changes how block renderer endpoint is non defined

[WordPress Trac]

#50620: REST API: regression after introducing changes how block renderer endpoint
is non defined
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 Reporter:  manooweb      |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  trunk
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Hello,

 We developed a dynamic block with only boolean block attributes.
 For this development we used WordPress 5.4.2 and everything works fine.

 We are testing with the future version of WordPress 5.5 ( WordPress
 5.5-beta1-48410 ) and we noticed a regression because sanitization of
 block attributes doesn't work anymore espacially for boolean attributes
 which is important to get the right value in PHP (true or false) and not a
 string.

 Indeed there has been changes in the REST API block renderer endpoint
 definition introduced by this changeset
 https://core.trac.wordpress.org/changeset/48069 to fix this ticket
 https://core.trac.wordpress.org/ticket/48079

 As we can see in the endpoint schema we lost the 'properties' attributes
 which is used before to set the block attributes.

 Everything is ok during the attributes validation which passes through the
 'validate_callback' defined in the endpoint.

 However during the REST API process we also pass through a sanitization
 step here https://github.com/WordPress/WordPress/blob/master/wp-includes
 /rest-api/class-wp-rest-server.php#L965

 and then here for block attributes
 https://github.com/WordPress/WordPress/blob/master/wp-includes/rest-
 api.php#L1864

 We never pass through the condition because the 'properties' array is
 never defined at this point as it should be.

 As every dynamic blocks need their own attributes, I don't understand how
 to set correctly this 'properties' array to get the values correctly
 sanitized.

 Of course we found a workaround on our side directly in our
 'render_callback' of our dynamic block function but I think it is not the
 best and right solution.

 If you need further information, let me know.

 Regards

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Ticket URL: <https://core.trac.wordpress.org/ticket/50620>
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