#28165: FileExtensionValidator's allowed_extensions must be given in lower case
-------------------------------------+-------------------------------------
     Reporter:  Arne de Laat         |                    Owner:  nobody
         Type:  Bug                  |                   Status:  new
    Component:  File                 |                  Version:  1.11
  uploads/storage                    |
     Severity:  Normal               |               Resolution:
     Keywords:  validators           |             Triage Stage:
  filefield                          |  Unreviewed
    Has patch:  1                    |      Needs documentation:  0
  Needs tests:  0                    |  Patch needs improvement:  0
Easy pickings:  0                    |                    UI/UX:  0
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Comment (by Arne de Laat):

 The problem with that is that it would be less obvious, why not simply
 support case insensitive matching?
 Additionally if you retrieve the extensions from some source, as is done
 to validate images (using the extensions supported by Pillow) you need to
 ensure those are already lowered, or add some additional code to ensure
 they are.
 Also, the current validation error is also a bit unclear `'pdf' is not
 allowed. Allowed extensions are: 'PDF'`, even if the original file
 extension is `PDF`. So to clarify that error some code would need to be
 changed anyway.

--
Ticket URL: <https://code.djangoproject.com/ticket/28165#comment:2>
Django <https://code.djangoproject.com/>
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