File: urinorm.py

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import re

# from appendix B of rfc 3986 (http://www.ietf.org/rfc/rfc3986.txt)
uri_pattern = r'^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?'
uri_re = re.compile(uri_pattern)

# gen-delims  = ":" / "/" / "?" / "#" / "[" / "]" / "@"
#
# sub-delims  = "!" / "$" / "&" / "'" / "(" / ")"
#                  / "*" / "+" / "," / ";" / "="
#
# unreserved  = ALPHA / DIGIT / "-" / "." / "_" / "~"

uri_illegal_char_re = re.compile(
    "[^-A-Za-z0-9:/?#[\]@!$&'()*+,;=._~%]", re.UNICODE)

authority_pattern = r'^([^@]*@)?([^:]*)(:.*)?'
authority_re = re.compile(authority_pattern)


pct_encoded_pattern = r'%([0-9A-Fa-f]{2})'
pct_encoded_re = re.compile(pct_encoded_pattern)

try:
    unichr(0x10000)
except ValueError:
    # narrow python build
    UCSCHAR = [
        (0xA0, 0xD7FF),
        (0xF900, 0xFDCF),
        (0xFDF0, 0xFFEF),
        ]

    IPRIVATE = [
        (0xE000, 0xF8FF),
        ]
else:
    UCSCHAR = [
        (0xA0, 0xD7FF),
        (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),
        ]

    IPRIVATE = [
        (0xE000, 0xF8FF),
        (0xF0000, 0xFFFFD),
        (0x100000, 0x10FFFD),
        ]


_unreserved = [False] * 256
for _ in range(ord('A'), ord('Z') + 1): _unreserved[_] = True
for _ in range(ord('0'), ord('9') + 1): _unreserved[_] = True
for _ in range(ord('a'), ord('z') + 1): _unreserved[_] = True
_unreserved[ord('-')] = True
_unreserved[ord('.')] = True
_unreserved[ord('_')] = True
_unreserved[ord('~')] = True


_escapeme_re = re.compile('[%s]' % (''.join(
    map(lambda (m, n): u'%s-%s' % (unichr(m), unichr(n)),
        UCSCHAR + IPRIVATE)),))


def _pct_escape_unicode(char_match):
    c = char_match.group()
    return ''.join(['%%%X' % (ord(octet),) for octet in c.encode('utf-8')])


def _pct_encoded_replace_unreserved(mo):
    try:
        i = int(mo.group(1), 16)
        if _unreserved[i]:
            return chr(i)
        else:
            return mo.group().upper()

    except ValueError:
        return mo.group()


def _pct_encoded_replace(mo):
    try:
        return chr(int(mo.group(1), 16))
    except ValueError:
        return mo.group()


def remove_dot_segments(path):
    result_segments = []

    while path:
        if path.startswith('../'):
            path = path[3:]
        elif path.startswith('./'):
            path = path[2:]
        elif path.startswith('/./'):
            path = path[2:]
        elif path == '/.':
            path = '/'
        elif path.startswith('/../'):
            path = path[3:]
            if result_segments:
                result_segments.pop()
        elif path == '/..':
            path = '/'
            if result_segments:
                result_segments.pop()
        elif path == '..' or path == '.':
            path = ''
        else:
            i = 0
            if path[0] == '/':
                i = 1
            i = path.find('/', i)
            if i == -1:
                i = len(path)
            result_segments.append(path[:i])
            path = path[i:]

    return ''.join(result_segments)


def urinorm(uri):
    if isinstance(uri, unicode):
        uri = _escapeme_re.sub(_pct_escape_unicode, uri).encode('ascii')

    illegal_mo = uri_illegal_char_re.search(uri)
    if illegal_mo:
        raise ValueError('Illegal characters in URI: %r at position %s' %
                         (illegal_mo.group(), illegal_mo.start()))

    uri_mo = uri_re.match(uri)

    scheme = uri_mo.group(2)
    if scheme is None:
        raise ValueError('No scheme specified')

    scheme = scheme.lower()
    if scheme not in ('http', 'https'):
        raise ValueError('Not an absolute HTTP or HTTPS URI: %r' % (uri,))

    authority = uri_mo.group(4)
    if authority is None:
        raise ValueError('Not an absolute URI: %r' % (uri,))

    authority_mo = authority_re.match(authority)
    if authority_mo is None:
        raise ValueError('URI does not have a valid authority: %r' % (uri,))

    userinfo, host, port = authority_mo.groups()

    if userinfo is None:
        userinfo = ''

    if '%' in host:
        host = host.lower()
        host = pct_encoded_re.sub(_pct_encoded_replace, host)
        host = unicode(host, 'utf-8').encode('idna')
    else:
        host = host.lower()

    if port:
        if (port == ':' or
            (scheme == 'http' and port == ':80') or
            (scheme == 'https' and port == ':443')):
            port = ''
    else:
        port = ''

    authority = userinfo + host + port

    path = uri_mo.group(5)
    path = pct_encoded_re.sub(_pct_encoded_replace_unreserved, path)
    path = remove_dot_segments(path)
    if not path:
        path = '/'

    query = uri_mo.group(6)
    if query is None:
        query = ''

    fragment = uri_mo.group(8)
    if fragment is None:
        fragment = ''

    return scheme + '://' + authority + path + query + fragment