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import re
class MediaType(object):
This class parses a media-type string as is found in HTTP headers (possibly
with params), and exposes the important information in an intuitive interface
* type: string, the main mime type
* subtype: string, the mime subtype
* params: {string: string}. Maybe should be {string: [string]}?
# RE for parsing media types. type and subtype are alpha-numeric strings
# possibly with '-'s. Then the optional parameter list: names are same type
# of string as the types above, values are pretty much anything but another
# semicolon
mediatype_re = re.compile(
# RE for parsing name-value pairs
nvpair_re = re.compile(r'^\s*([\w\-]+)=([^;\s]+)\s*$')
# constructor
def __init__(self, data):
data = string, the media type string
if not data:
log.warning('Setting empty media type to x-unknown-content-type')
self.type = 'application'
self.subtype = 'x-unknown-content-type'
params = {}
match = self.mediatype_re.match(data)
if match:
# get type/subtype
self.type =
# params
self.params = {}
param_str = # we know this is well-formed, except for extra whitespace
for pair in param_str.split(';'):
pair = pair.strip()
if pair:
pairmatch = self.nvpair_re.match(pair)
if not pairmatch: raise Exception('MediaType.__init__: invalid pair: "' + pair + '"')
self.params[] =
raise ValueError('invalid media type string: ' + data)
def mimeType(self):
return '%s/%s' % (self.type, self.subtype)
def __str__(self):
result = self.mimeType()
for n,v in self.params.iteritems():
result += '; %s=%s' % (n, v)
return result
def __repr__(self):
return 'MediaType(%s)' % self.__str__()
# test mimetype parsing
if __name__ == '__main__':
m = MediaType('application/rdf+xml ;charset=ISO-5591-1 ;foo=bar ')
print m.mimeType()
print m.params['charset']
print m.params['foo']
m = MediaType('image/')
print m.mimeType()
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