[wp-trac] [WordPress Trac] #55515: About the problem that the php file of the theme editor and plugin editor cannot be edited in multi-site

[WordPress Trac]

#55515: About the problem that the php file of the theme editor and plugin editor
cannot be edited in multi-site
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 Reporter:  ishihara takashi            |       Owner:  (none)
     Type:  defect (bug)                |      Status:  closed
 Priority:  normal                      |   Milestone:
Component:  Networks and Sites          |     Version:  5.9.2
 Severity:  normal                      |  Resolution:  wontfix
 Keywords:  dev-feedback has-test-info  |     Focuses:  multisite
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Comment (by ampluswp):

 Hello

 I ran into the same issue and spent quite some time debugging it. In my
 case this happened in a WordPress Multisite installation when trying to
 edit functions.php via the built-in Theme Editor in the network admin.

 The strange thing was that:

 saving style.css worked

 saving functions.php always failed with the message that WordPress could
 not verify the site communication and therefore reverted the change

 no PHP error appeared in debug.log

 the AJAX request itself returned HTTP 200

 After adding extensive logging I found that the actual save request works
 correctly (admin-ajax.php, action edit-theme-plugin-file). The problem
 occurs in the second request that WordPress performs to validate the PHP
 file.

 WordPress sends a loopback request like this:

 /wp-admin/theme-
 editor.php?theme=...&file=functions.php&wp_scrape_key=...&wp_scrape_nonce=...

 In a Multisite environment this request ends up loading the network theme
 editor page, returning the full admin HTML instead of the expected scrape
 response. Because of that the validation step fails and WordPress rolls
 back the change even though the file itself is valid.

 Key observations from the logs:

 save request succeeds

 response code 200

 no PHP errors

 loopback request returns the full network theme editor HTML

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Ticket URL: <https://core.trac.wordpress.org/ticket/55515#comment:5>
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