blob: b6bbcfb284a0cc0d48852462329d0df835f9691d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
# This file is released under the GNU GPL, version 3 or a later revision.
# For further details see the COPYING file
import re
import magic
def guess_mimetype(blob):
"""
uses file magic to determine the mime-type of the given data blob.
:param blob: file content as read by file.read()
:type blob: data
:returns: mime-type, falls back to 'application/octet-stream'
:rtype: str
"""
mimetype = 'application/octet-stream'
# this is a bit of a hack to support different versions of python magic.
# Hopefully at some point this will no longer be necessary
#
# the version with open() is the bindings shipped with the file source from
# http://darwinsys.com/file/ - this is what is used by the python-magic
# package on Debian/Ubuntu. However, it is not available on pypi/via pip.
#
# the version with from_buffer() is available at
# https://github.com/ahupp/python-magic and directly installable via pip.
#
# for more detail see https://github.com/pazz/alot/pull/588
if hasattr(magic, 'open'):
m = magic.open(magic.MAGIC_MIME_TYPE)
m.load()
magictype = m.buffer(blob)
elif hasattr(magic, 'from_buffer'):
# cf. issue #841
magictype = magic.from_buffer(blob, mime=True) or magictype
else:
raise Exception('Unknown magic API')
# libmagic does not always return proper mimetype strings, cf. issue #459
if re.match(r'\w+\/\w+', magictype):
mimetype = magictype
return mimetype
|
