flanker
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Published
20 hours ago •
mailgun
mailgun
Improve parsing of MIME parameter part
I have mails with MIME headers like this:
Content-Type: application/pdf; name=30676_2015.pdf;name*=iso-8859-1''%33%30%36%37%36%5F%32%30%31%35%2E%70%64%66
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=30676_2015.pdf;
filename*=iso-8859-1''%33%30%36%37%36%5F%32%30%31%35%2E%70%64%66
The parameter name and filename are present as single encoded and single unencoded. This leads to an interpretation as a parameter continuation and to a concatenation of the values so that the result would be "30676_2015.pdf30676_2015.pdf".
I added code to avoid joining parameter values of the same name if they are not actually continuations, but just different encodings of the same value. Test is included!
