[wp-trac] [WordPress Trac] #42230: current_user_can( 'install_languages' ) calls a function which may not be defined

[WordPress Trac]

#42230: current_user_can( 'install_languages' ) calls a function which may not be
defined
-----------------------------+-------------------------
 Reporter:  johnbillion      |      Owner:
     Type:  defect (bug)     |     Status:  new
 Priority:  low              |  Milestone:  4.9
Component:  Role/Capability  |    Version:  trunk
 Severity:  critical         |   Keywords:  needs-patch
  Focuses:                   |
-----------------------------+-------------------------
 The following code causes a fatal error when used on the front end of a
 site:

 {{{
 add_action( 'init', function() {
         current_user_can( 'install_languages' );
 } );
 }}}

 This is because the `install_languages` case inside `map_meta_cap()` calls
 `wp_can_install_language_pack()` which in turn instantiates the
 `WP_Upgrader` class and calls methods which call functions which are only
 available in the admin context. `request_filesystem_credentials()` is
 ultimately called and causes a fatal error because the function is only
 available in the admin context.

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Ticket URL: <https://core.trac.wordpress.org/ticket/42230>
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