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import base64
import re
import pyparsing as pp
from .error import *
UNQUOTE_PAIRS = re.compile(r"\\(.)")
unquote = lambda s, l, t: UNQUOTE_PAIRS.sub(r"\1", t[0][1:-1])
# https://tools.ietf.org/html/rfc7235#section-1.2
# https://tools.ietf.org/html/rfc7235#appendix-B
tchar = "!#$%&'*+-.^_`|~" + pp.nums + pp.alphas
token = pp.Word(tchar).setName("token")
token68 = pp.Combine(pp.Word("-._~+/" + pp.nums + pp.alphas) + pp.Optional(pp.Word("=").leaveWhitespace())).setName(
"token68"
)
quoted_string = pp.dblQuotedString.copy().setName("quoted-string").setParseAction(unquote)
auth_param_name = token.copy().setName("auth-param-name").addParseAction(pp.downcaseTokens)
auth_param = auth_param_name + pp.Suppress("=") + (quoted_string | token)
params = pp.Dict(pp.delimitedList(pp.Group(auth_param)))
scheme = token("scheme")
challenge = scheme + (params("params") | token68("token"))
authentication_info = params.copy()
www_authenticate = pp.delimitedList(pp.Group(challenge))
def _parse_authentication_info(headers, headername="authentication-info"):
"""https://tools.ietf.org/html/rfc7615
"""
header = headers.get(headername, "").strip()
if not header:
return {}
try:
parsed = authentication_info.parseString(header)
except pp.ParseException as ex:
# print(ex.explain(ex))
raise MalformedHeader(headername)
return parsed.asDict()
def _parse_www_authenticate(headers, headername="www-authenticate"):
"""Returns a dictionary of dictionaries, one dict per auth_scheme."""
header = headers.get(headername, "").strip()
if not header:
return {}
try:
parsed = www_authenticate.parseString(header)
except pp.ParseException as ex:
# print(ex.explain(ex))
raise MalformedHeader(headername)
retval = {
challenge["scheme"].lower(): challenge["params"].asDict()
if "params" in challenge
else {"token": challenge.get("token")}
for challenge in parsed
}
return retval