kopia lustrzana https://gitlab.com/marnanel/chapeau
80 wiersze
2.8 KiB
Python
80 wiersze
2.8 KiB
Python
# based on:
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# https://gist.github.com/samuraisam/2714195
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#
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#####
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# The author disclaims copyright to this source code. In place of a legal
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# notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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# It is based on a snipped found in this project:
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# https://github.com/martinblech/mimerender
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import functools
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def parse_accept_header(accept):
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"""
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Parse the Accept header *accept*, returning a list with 3-tuples of
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[(str(media_type), dict(params), float(q_value)),] ordered by q values.
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If the accept header includes vendor-specific types like::
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application/vnd.yourcompany.yourproduct-v1.1+json
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It will actually convert the vendor and version into parameters and
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convert the content type into `application/json` so appropriate content
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negotiation decisions can be made.
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Default `q` for values that are not specified is 1.0
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"""
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result = []
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for media_range in accept.split(","):
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parts = media_range.split(";")
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media_type = parts.pop(0).strip()
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media_params = []
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# convert vendor-specific content types into something useful (see
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# docstring)
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try:
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typ, subtyp = media_type.split('/')
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except ValueError:
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typ = ''
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subtyp = ''
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# check for a + in the sub-type
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if '+' in subtyp:
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# if it exists, determine if the subtype is a vendor-specific type
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vnd, sep, extra = subtyp.partition('+')
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if vnd.startswith('vnd'):
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# and then... if it ends in something like "-v1.1" parse the
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# version out
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if '-v' in vnd:
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vnd, sep, rest = vnd.rpartition('-v')
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if len(rest):
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# add the version as a media param
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try:
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version = media_params.append(('version',
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float(rest)))
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except ValueError:
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version = 1.0 # could not be parsed
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# add the vendor code as a media param
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media_params.append(('vendor', vnd))
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# and re-write media_type to something like application/json so
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# it can be used usefully when looking up emitters
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subtyp = extra
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q = 1.0
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for part in parts:
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(key, value) = part.lstrip().split("=", 1)
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key = key.strip()
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value = value.strip()
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if key == "q":
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q = float(value)
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else:
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media_params.append((key, value))
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result.append((typ, subtyp, dict(media_params), q))
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result.sort(key=lambda n: -n[3])
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return result
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