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import re
import time
import string
from datetime import datetime
from datetime import date
from datetime import timedelta
__all__ = ['Cookie']
class Cookie(dict):
def __init__(self, input=None):
if input:
self.load(input)
def load(self, data):
ckey = None
for key, val in _rx_cookie.findall(data):
if key.lower() in _c_keys:
if ckey:
self[ckey][key] = _unquote(val)
elif key[0] == '$':
# RFC2109: NAMEs that begin with $ are reserved for other uses
# and must not be used by applications.
continue
else:
self[key] = _unquote(val)
ckey = key
def __setitem__(self, key, val):
if needs_quoting(key):
return
dict.__setitem__(self, key, Morsel(key, val))
def serialize(self, full=True):
return ', '.join(m.serialize(full) for m in self.values())
def values(self):
return [m for _,m in sorted(self.items())]
__str__ = serialize
def __repr__(self):
return '<%s: [%s]>' % (self.__class__.__name__,
', '.join(map(repr, self.values())))
def cookie_property(key, serialize=lambda v: v):
def fset(self, v):
self[key] = serialize(v)
return property(lambda self: self[key], fset)
def serialize_max_age(v):
if isinstance(v, timedelta):
return str(v.seconds + v.days*24*60*60)
elif isinstance(v, int):
return str(v)
else:
return v
def serialize_cookie_date(v):
if v is None:
return None
elif isinstance(v, str):
return v
elif isinstance(v, int):
v = timedelta(seconds=v)
if isinstance(v, timedelta):
v = datetime.utcnow() + v
if isinstance(v, (datetime, date)):
v = v.timetuple()
r = time.strftime('%%s, %d-%%s-%Y %H:%M:%S GMT', v)
return r % (weekdays[v[6]], months[v[1]])
class Morsel(dict):
__slots__ = ('name', 'value')
def __init__(self, name, value):
assert name.lower() not in _c_keys
assert not needs_quoting(name)
assert isinstance(value, str)
self.name = name
# we can encode the unicode value as UTF-8 here,
# but then the decoded cookie would still be str,
# so we don't do that
self.value = value
self.update(dict.fromkeys(_c_keys, None))
path = cookie_property('path')
domain = cookie_property('domain')
comment = cookie_property('comment')
expires = cookie_property('expires', serialize_cookie_date)
max_age = cookie_property('max-age', serialize_max_age)
httponly = cookie_property('httponly', bool)
secure = cookie_property('secure', bool)
def __setitem__(self, k, v):
k = k.lower()
if k in _c_keys:
dict.__setitem__(self, k, v)
def serialize(self, full=True):
result = []
add = result.append
add("%s=%s" % (self.name, _quote(self.value)))
if full:
for k in _c_valkeys:
v = self[k]
if v:
assert isinstance(v, str), v
add("%s=%s" % (_c_renames[k], _quote(v)))
if self.secure:
add('secure')
if self.httponly:
add('HttpOnly')
return '; '.join(result)
__str__ = serialize
def __repr__(self):
return '<%s: %s=%s>' % (self.__class__.__name__,
self.name, repr(self.value))
_c_renames = {
"expires" : "expires",
"path" : "Path",
"comment" : "Comment",
"domain" : "Domain",
"max-age" : "Max-Age",
}
_c_valkeys = sorted(_c_renames)
_c_keys = set(_c_renames)
_c_keys.update(['secure', 'httponly'])
#
# parsing
#
_re_quoted = r'"(?:[^\"]|\.)*"' # any doublequoted string
_legal_special_chars = "~!@#$%^&*()_+=-`.?|:/(){}<>'"
_re_legal_char = r"[\w\d%s]" % ''.join(map(r'\%s'.__mod__,
_legal_special_chars))
_re_expires_val = r"\w{3},\s[\w\d-]{9,11}\s[\d:]{8}\sGMT"
_rx_cookie = re.compile(
# key
(r"(%s+?)" % _re_legal_char)
# =
+ r"\s*=\s*"
# val
+ r"(%s|%s*|%s)" % (_re_quoted, _re_legal_char, _re_expires_val)
)
_rx_unquote = re.compile(r'\\([0-3][0-7][0-7]|.)')
def _unquote(v):
if v and v[0] == v[-1] == '"':
v = v[1:-1]
def _ch_unquote(m):
v = m.group(1)
if v.isdigit():
return chr(int(v, 8))
return v
v = _rx_unquote.sub(_ch_unquote, v)
return v
#
# serializing
#
_trans_noop = ''.join(chr(x) for x in xrange(256))
# these chars can be in cookie value w/o causing it to be quoted
_no_escape_special_chars = "!#$%&'*+-.^_`|~/"
_no_escape_chars = string.ascii_letters + string.digits + \
_no_escape_special_chars
# these chars never need to be quoted
_escape_noop_chars = _no_escape_chars+':, '
# this is a map used to escape the values
_escape_map = dict((chr(i), '\\%03o' % i) for i in xrange(256))
_escape_map.update(zip(_escape_noop_chars, _escape_noop_chars))
_escape_map['"'] = '\\"'
_escape_map['\\'] = '\\\\'
_escape_char = _escape_map.__getitem__
weekdays = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')
months = (None, 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
'Oct', 'Nov', 'Dec')
def needs_quoting(v):
return v.translate(_trans_noop, _no_escape_chars)
def _quote(v):
if needs_quoting(v):
return '"' + ''.join(map(_escape_char, v)) + '"'
return v
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