""" iri2uri Converts an IRI to a URI. """ __author__ = "Joe Gregorio (joe@bitworking.org)" __copyright__ = "Copyright 2006, Joe Gregorio" __contributors__ = [] __version__ = "1.0.0" __license__ = "MIT" __history__ = """ """ import urlparse # Convert an IRI to a URI following the rules in RFC 3987 # # The characters we need to enocde and escape are defined in the spec: # # iprivate = %xE000-F8FF / %xF0000-FFFFD / %x100000-10FFFD # ucschar = %xA0-D7FF / %xF900-FDCF / %xFDF0-FFEF # / %x10000-1FFFD / %x20000-2FFFD / %x30000-3FFFD # / %x40000-4FFFD / %x50000-5FFFD / %x60000-6FFFD # / %x70000-7FFFD / %x80000-8FFFD / %x90000-9FFFD # / %xA0000-AFFFD / %xB0000-BFFFD / %xC0000-CFFFD # / %xD0000-DFFFD / %xE1000-EFFFD escape_range = [ (0xA0, 0xD7FF ), (0xE000, 0xF8FF ), (0xF900, 0xFDCF ), (0xFDF0, 0xFFEF), (0x10000, 0x1FFFD ), (0x20000, 0x2FFFD ), (0x30000, 0x3FFFD), (0x40000, 0x4FFFD ), (0x50000, 0x5FFFD ), (0x60000, 0x6FFFD), (0x70000, 0x7FFFD ), (0x80000, 0x8FFFD ), (0x90000, 0x9FFFD), (0xA0000, 0xAFFFD ), (0xB0000, 0xBFFFD ), (0xC0000, 0xCFFFD), (0xD0000, 0xDFFFD ), (0xE1000, 0xEFFFD), (0xF0000, 0xFFFFD ), (0x100000, 0x10FFFD) ] def encode(c): retval = c i = ord(c) for low, high in escape_range: if i < low: break if i >= low and i <= high: retval = "".join(["%%%2X" % ord(o) for o in c.encode('utf-8')]) break return retval def iri2uri(uri): """Convert an IRI to a URI. Note that IRIs must be passed in a unicode strings. That is, do not utf-8 encode the IRI before passing it into the function.""" if isinstance(uri ,unicode): (scheme, authority, path, query, fragment) = urlparse.urlsplit(uri) authority = authority.encode('idna') # For each character in 'ucschar' or 'iprivate' # 1. encode as utf-8 # 2. then %-encode each octet of that utf-8 uri = urlparse.urlunsplit((scheme, authority, path, query, fragment)) uri = "".join([encode(c) for c in uri]) return uri if __name__ == "__main__": import unittest class Test(unittest.TestCase): def test_uris(self): """Test that URIs are invariant under the transformation.""" invariant = [ u"ftp://ftp.is.co.za/rfc/rfc1808.txt", u"http://www.ietf.org/rfc/rfc2396.txt", u"ldap://[2001:db8::7]/c=GB?objectClass?one", u"mailto:John.Doe@example.com", u"news:comp.infosystems.www.servers.unix", u"tel:+1-816-555-1212", u"telnet://192.0.2.16:80/", u"urn:oasis:names:specification:docbook:dtd:xml:4.1.2" ] for uri in invariant: self.assertEqual(uri, iri2uri(uri)) def test_iri(self): """ Test that the right type of escaping is done for each part of the URI.""" self.assertEqual("http://xn--o3h.com/%E2%98%84", iri2uri(u"http://\N{COMET}.com/\N{COMET}")) self.assertEqual("http://bitworking.org/?fred=%E2%98%84", iri2uri(u"http://bitworking.org/?fred=\N{COMET}")) self.assertEqual("http://bitworking.org/#%E2%98%84", iri2uri(u"http://bitworking.org/#\N{COMET}")) self.assertEqual("#%E2%98%84", iri2uri(u"#\N{COMET}")) self.assertEqual("/fred?bar=%E2%98%9A#%E2%98%84", iri2uri(u"/fred?bar=\N{BLACK LEFT POINTING INDEX}#\N{COMET}")) self.assertEqual("/fred?bar=%E2%98%9A#%E2%98%84", iri2uri(iri2uri(u"/fred?bar=\N{BLACK LEFT POINTING INDEX}#\N{COMET}"))) self.assertNotEqual("/fred?bar=%E2%98%9A#%E2%98%84", iri2uri(u"/fred?bar=\N{BLACK LEFT POINTING INDEX}#\N{COMET}".encode('utf-8'))) unittest.main()