[wp-trac] [WordPress Trac] #33240: Introduce a capability for previewing posts

[WordPress Trac]

#33240: Introduce a capability for previewing posts
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 Reporter:  johnbillion  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:               |    Version:
  Role/Capability        |   Keywords:  needs-patch needs-unit-tests dev-
 Severity:  normal       |  feedback
  Focuses:               |
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 In order to preview an unpublished post (ie. draft or pending), a user
 needs the `edit_posts` capability for that post type
 ([https://core.trac.wordpress.org/browser/tags/4.2.3/src/wp-
 includes/capabilities.php#L1174 src]).

 There is a valid use case where a site requires a user role which has the
 capability to preview unpublished posts but not edit them, for example for
 editorial review/sign-off, layout review, early access, etc.

 You can [http://wordpress.stackexchange.com/a/196209/27051 get around this
 by using a combination of the posts_results and the_posts filters], but
 this isn't very future-proof because the post results skip a bunch of
 logic that occurs between those two filters.

 A `preview_post` meta capability and a `preview_posts` primitive
 capability could be introduced and implemented wherever the `edit_posts`
 capability is used in regard to previewing unpublished posts. By default,
 it will simply map to the `edit_posts` capability.

 Thoughts?

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Ticket URL: <https://core.trac.wordpress.org/ticket/33240>
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