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# -*- test-case-name: openid.test.test_xri -*-
"""Utility functions for handling XRIs.
@see: XRI Syntax v2.0 at the U{OASIS XRI Technical Committee<http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=xri>}
"""
import re
from functools import reduce
from openid import codecutil # registers 'oid_percent_escape' encoding handler
XRI_AUTHORITIES = ['!', '=', '@', '+', '$', '(']
def identifierScheme(identifier):
"""Determine if this identifier is an XRI or URI.
@returns: C{"XRI"} or C{"URI"}
"""
if identifier.startswith('xri://') or (
identifier and identifier[0] in XRI_AUTHORITIES):
return "XRI"
else:
return "URI"
def toIRINormal(xri):
"""Transform an XRI to IRI-normal form."""
if not xri.startswith('xri://'):
xri = 'xri://' + xri
return escapeForIRI(xri)
_xref_re = re.compile('\((.*?)\)')
def _escape_xref(xref_match):
"""Escape things that need to be escaped if they're in a cross-reference.
"""
xref = xref_match.group()
xref = xref.replace('/', '%2F')
xref = xref.replace('?', '%3F')
xref = xref.replace('#', '%23')
return xref
def escapeForIRI(xri):
"""Escape things that need to be escaped when transforming to an IRI."""
xri = xri.replace('%', '%25')
xri = _xref_re.sub(_escape_xref, xri)
return xri
def toURINormal(xri):
"""Transform an XRI to URI normal form."""
return iriToURI(toIRINormal(xri))
def iriToURI(iri):
"""Transform an IRI to a URI by escaping unicode."""
# According to RFC 3987, section 3.1, "Mapping of IRIs to URIs"
if isinstance(iri, bytes):
iri = str(iri, encoding="utf-8")
return iri.encode('ascii', errors='oid_percent_escape').decode()
def providerIsAuthoritative(providerID, canonicalID):
"""Is this provider ID authoritative for this XRI?
@returntype: bool
"""
# XXX: can't use rsplit until we require python >= 2.4.
lastbang = canonicalID.rindex('!')
parent = canonicalID[:lastbang]
return parent == providerID
def rootAuthority(xri):
"""Return the root authority for an XRI.
Example::
rootAuthority("xri://@example") == "xri://@"
@type xri: unicode
@returntype: unicode
"""
if xri.startswith('xri://'):
xri = xri[6:]
authority = xri.split('/', 1)[0]
if authority[0] == '(':
# Cross-reference.
# XXX: This is incorrect if someone nests cross-references so there
# is another close-paren in there. Hopefully nobody does that
# before we have a real xriparse function. Hopefully nobody does
# that *ever*.
root = authority[:authority.index(')') + 1]
elif authority[0] in XRI_AUTHORITIES:
# Other XRI reference.
root = authority[0]
else:
# IRI reference. XXX: Can IRI authorities have segments?
segments = authority.split('!')
segments = reduce(list.__add__,
[s.split('*') for s in segments])
root = segments[0]
return XRI(root)
def XRI(xri):
"""An XRI object allowing comparison of XRI.
Ideally, this would do full normalization and provide comparsion
operators as per XRI Syntax. Right now, it just does a bit of
canonicalization by ensuring the xri scheme is present.
@param xri: an xri string
@type xri: unicode
"""
if not xri.startswith('xri://'):
xri = 'xri://' + xri
return xri
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