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Package for parsing ``Authentication-Results`` headers as defined in RFC
5451/7001/7601/8601.  Optional support for authentication methods defined in
RFCs 5617, 6008, 6212, 7281, and 8617.

Examples:
RFC 5451 B.2
>>> str(AuthenticationResultsHeader('test.example.org'))
'Authentication-Results: test.example.org; none'

RFC 5451 B.3
>>> str(AuthenticationResultsHeader(authserv_id = 'example.com',
... results = [SPFAuthenticationResult(result = 'pass',
... smtp_mailfrom = 'example.net')]))
'Authentication-Results: example.com; spf=pass smtp.mailfrom=example.net'

RFC 5451 B.4(1)
>>> str(AuthenticationResultsHeader(authserv_id = 'example.com',
... results = [SMTPAUTHAuthenticationResult(result = 'pass', result_comment = 'cram-md5',
... smtp_auth = 'sender@example.net'), SPFAuthenticationResult(result = 'pass',
... smtp_mailfrom = 'example.net')]))
'Authentication-Results: example.com; auth=pass (cram-md5) smtp.auth=sender@example.net; spf=pass smtp.mailfrom=example.net'

RFC 5451 B.4(2)
>>> str(AuthenticationResultsHeader(authserv_id = 'example.com',
... results = [SenderIDAuthenticationResult(result = 'pass',
... header_from = 'example.com')]))
'Authentication-Results: example.com; sender-id=pass header.from=example.com'

RFC 5451 B.5(1) # Note: RFC 5451 uses 'hardfail' instead of 'fail' for
SPF failures. Hardfail is deprecated.  See RFC 6577.
Examples here use the correct 'fail'. The authres module does not
validate result codes, so either will be processed.

>>> str(AuthenticationResultsHeader(authserv_id = 'example.com',
... results = [SenderIDAuthenticationResult(result = 'fail',
... header_from = 'example.com'), DKIMAuthenticationResult(result = 'pass',
... header_i = 'sender@example.com', result_comment = 'good signature')]))
'Authentication-Results: example.com; sender-id=fail header.from=example.com; dkim=pass (good signature) header.i=sender@example.com'

# Missing parsing header comment.
#FIXME
>>> arobj = AuthenticationResultsHeader.parse('Authentication-Results: example.com; sender-id=fail header.from=example.com; dkim=pass (good signature) header.i=sender@example.com')
>>> str(arobj.authserv_id)
'example.com'
>>> str(arobj.results[0])
'sender-id=fail header.from=example.com'
>>> str(arobj.results[0].method)
'sender-id'
>>> str(arobj.results[0].result)
'fail'
>>> str(arobj.results[0].header_from)
'example.com'
>>> str(arobj.results[0].properties[0].type)
'header'
>>> str(arobj.results[0].properties[0].name)
'from'
>>> str(arobj.results[0].properties[0].value)
'example.com'
>>> str(arobj.results[1])
'dkim=pass header.i=sender@example.com'
>>> str(arobj.results[1].method)
'dkim'
>>> str(arobj.results[1].result)
'pass'
>>> str(arobj.results[1].header_i)
'sender@example.com'
>>> str(arobj.results[1].properties[0].type)
'header'
>>> str(arobj.results[1].properties[0].name)
'i'
>>> str(arobj.results[1].properties[0].value)
'sender@example.com'
�authreszJulian Mehnle, Scott Kittermanzjulian@mehnle.netz1.2.0�N)
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