[wp-trac] [WordPress Trac] #40175: Upload Validation / MIME Handling

[WordPress Trac]

#40175: Upload Validation / MIME Handling
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 Reporter:  blobfolio                            |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  assigned
 Priority:  high                                 |   Milestone:  Future
                                                 |  Release
Component:  Media                                |     Version:  4.7.3
 Severity:  major                                |  Resolution:
 Keywords:  has-unit-tests early needs-dev-note  |     Focuses:
                                                 |  administration
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Comment (by benz001):

 Not sure if this is best listed as a new feature request or a comment on
 this one, but to add another couple of examples to this: .DWG files can be
 `'dwg' => 'image/vnd.dwg'` or `'dwg' => 'text/plain'` similarly DXF files
 can be `'dxf' => 'text/plain'` or `'dxf' => 'application/octet-stream'`
 and possibly more. Both formats support text and binary versions of their
 extensions. SVGs can do a similar thing.

 As far as I can tell the `add_custom_mime_types` filter allows for adding
 new extensions and for multiple extensions to map to the same type, but
 not the reverse ie multiple types per extension can't be added.

 Hence the need discussed above (and here
 https://wordpress.stackexchange.com/questions/323750/how-to-assign-
 multiple-file-mime-types-to-extension/346169#346169) to loop around the
 check and retry with a new mime type array.

 For us, we regularly hit this when users attempt to submit drawings of
 various types through a gravity forms contact form.

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Ticket URL: <https://core.trac.wordpress.org/ticket/40175#comment:81>
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