[wp-trac] [WordPress Trac] #36614: admin-ajax.php is not compatible with multisite

[WordPress Trac]

#36614: admin-ajax.php is not compatible with multisite
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 Reporter:  helium-3            |      Owner:
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Networks and Sites  |    Version:  4.3
 Severity:  normal              |   Keywords:
  Focuses:  multisite           |
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 I have noticed a major problem with admin-ajax.php on multisite.

  admin-ajax.php works completely only for the primary blog

 It seems like on mulisite admin-ajax.php is just a regular primary blog
 page. You could use switch to blog, but it doesn't work completely. For
 example $user->roles will return roles for the primary blog, even after
 you switched. current_user_can_for_blog doesn't seem to work at all during
 ajax call. The only way to check user roles for a specific blog is to
 check usermeta.

 But that's just if the plugin is active networkwide. What if the plugin is
 active for a blog, other than primary? It won't fire at all in admin-
 ajax.php . '''Meaning admin-ajax.php is unusable to plugins activated on a
 blog other than primary.'''

 WordPress needs to stop treating admin-ajax.php as if it was a primary
 blog page. There should be a request parameter, like blog_id which would
 tell which blog we are running request for.


 I think this should be fixed asap in the next release. This basically
 prevents writing plugins which should work on a specific blog of multisite
 and use ajax.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36614>
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