[wp-trac] [WordPress Trac] #41159: REST API: Add a way to determine if a request is an embedded "sub-request"

[WordPress Trac]

#41159: REST API: Add a way to determine if a request is an embedded "sub-request"
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 Reporter:  jnylen0                       |       Owner:
     Type:  enhancement                   |      Status:  new
 Priority:  normal                        |   Milestone:  Future Release
Component:  REST API                      |     Version:  4.4
 Severity:  normal                        |  Resolution:
 Keywords:  needs-patch needs-unit-tests  |     Focuses:  rest-api
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Comment (by jnylen0):

 The rationale is that an `?_embed` response is not truly context-free -
 it's a tree of requests that are all returned at the same time, and it's
 occasionally useful to be able to decipher this structure.

 For some background, the v1 WP.com REST API does not allow listing or
 fetching users or media unauthenticated, so we decided to preserve that
 contract when adding the WP REST API and prohibit the same operations
 there.

 However, it should still be possible to get limited user or media item
 details via `?_embed`.  My specific use case here is to make this
 possible.

 Currently this is achieved by watching `rest_request_before_callbacks` and
 remembering some information about the "root" request.  The solution
 described in this ticket would be much less hacky.

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Ticket URL: <https://core.trac.wordpress.org/ticket/41159#comment:2>
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