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Re: [Nmh-workers] When send does not recognize a mime type

From: jon
Subject: Re: [Nmh-workers] When send does not recognize a mime type
Date: Tue, 11 Sep 2012 10:12:41 -0700

Lyndon Nerenberg writes:
> What we really ought to do is derive the MIME type from the file contents.
> I realize this means bundling an implementation of magic, but I think it's
> worth the price.  There are several license-compatible implementations out
> there that could be used as a starting point.

Send runs the file command on files.  However, it only does this to get
additional descriptive information.

Send (in make_mime_composition_file) tests for the existence of a known
suffix, and then picks text/plain or application/octet-stream depending
on whether or not there are non-ASCII characters in the content (see earlier
complaints).   It could be changed to run file if there was no known suffix.

BUT, finding the file type does not give you the mime type.  There's the rub.

I guess that I think that this is pretty much a non-issue.  I believe (I didn't
do this part of the work) that we import /etc/mime.types, so we likely have the
mime types for all of the file types that file would recognize.

There is also the issue that if types are not in the profile we can send 'em but
not receive 'em.


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