Editing: cookielib.py
r"""HTTP cookie handling for web clients. This module has (now fairly distant) origins in Gisle Aas' Perl module HTTP::Cookies, from the libwww-perl library. Docstrings, comments and debug strings in this code refer to the attributes of the HTTP cookie system as cookie-attributes, to distinguish them clearly from Python attributes. Class diagram (note that BSDDBCookieJar and the MSIE* classes are not distributed with the Python standard library, but are available from http://wwwsearch.sf.net/): CookieJar____ / \ \ FileCookieJar \ \ / | \ \ \ MozillaCookieJar | LWPCookieJar \ \ | | \ | ---MSIEBase | \ | / | | \ | / MSIEDBCookieJar BSDDBCookieJar |/ MSIECookieJar """ __all__ = ['Cookie', 'CookieJar', 'CookiePolicy', 'DefaultCookiePolicy', 'FileCookieJar', 'LWPCookieJar', 'lwp_cookie_str', 'LoadError', 'MozillaCookieJar'] import re, urlparse, copy, time, urllib try: import threading as _threading except ImportError: import dummy_threading as _threading import httplib # only for the default HTTP port from calendar import timegm debug = False # set to True to enable debugging via the logging module logger = None def _debug(*args): if not debug: return global logger if not logger: import logging logger = logging.getLogger("cookielib") return logger.debug(*args) DEFAULT_HTTP_PORT = str(httplib.HTTP_PORT) MISSING_FILENAME_TEXT = ("a filename was not supplied (nor was the CookieJar " "instance initialised with one)") def _warn_unhandled_exception(): # There are a few catch-all except: statements in this module, for # catching input that's bad in unexpected ways. Warn if any # exceptions are caught there. import warnings, traceback, StringIO f = StringIO.StringIO() traceback.print_exc(None, f) msg = f.getvalue() warnings.warn("cookielib bug!\n%s" % msg, stacklevel=2) # Date/time conversion # ----------------------------------------------------------------------------- EPOCH_YEAR = 1970 def _timegm(tt): year, month, mday, hour, min, sec = tt[:6] if ((year >= EPOCH_YEAR) and (1 <= month <= 12) and (1 <= mday <= 31) and (0 <= hour <= 24) and (0 <= min <= 59) and (0 <= sec <= 61)): return timegm(tt) else: return None DAYS = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"] MONTHS = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"] MONTHS_LOWER = [] for month in MONTHS: MONTHS_LOWER.append(month.lower()) def time2isoz(t=None): """Return a string representing time in seconds since epoch, t. If the function is called without an argument, it will use the current time. The format of the returned string is like "YYYY-MM-DD hh:mm:ssZ", representing Universal Time (UTC, aka GMT). An example of this format is: 1994-11-24 08:49:37Z """ if t is None: t = time.time() year, mon, mday, hour, min, sec = time.gmtime(t)[:6] return "%04d-%02d-%02d %02d:%02d:%02dZ" % ( year, mon, mday, hour, min, sec) def time2netscape(t=None): """Return a string representing time in seconds since epoch, t. If the function is called without an argument, it will use the current time. The format of the returned string is like this: Wed, DD-Mon-YYYY HH:MM:SS GMT """ if t is None: t = time.time() year, mon, mday, hour, min, sec, wday = time.gmtime(t)[:7] return "%s, %02d-%s-%04d %02d:%02d:%02d GMT" % ( DAYS[wday], mday, MONTHS[mon-1], year, hour, min, sec) UTC_ZONES = {"GMT": None, "UTC": None, "UT": None, "Z": None} TIMEZONE_RE = re.compile(r"^([-+])?(\d\d?):?(\d\d)?$") def offset_from_tz_string(tz): offset = None if tz in UTC_ZONES: offset = 0 else: m = TIMEZONE_RE.search(tz) if m: offset = 3600 * int(m.group(2)) if m.group(3): offset = offset + 60 * int(m.group(3)) if m.group(1) == '-': offset = -offset return offset def _str2time(day, mon, yr, hr, min, sec, tz): # translate month name to number # month numbers start with 1 (January) try: mon = MONTHS_LOWER.index(mon.lower())+1 except ValueError: # maybe it's already a number try: imon = int(mon) except ValueError: return None if 1 <= imon <= 12: mon = imon else: return None # make sure clock elements are defined if hr is None: hr = 0 if min is None: min = 0 if sec is None: sec = 0 yr = int(yr) day = int(day) hr = int(hr) min = int(min) sec = int(sec) if yr < 1000: # find "obvious" year cur_yr = time.localtime(time.time())[0] m = cur_yr % 100 tmp = yr yr = yr + cur_yr - m m = m - tmp if abs(m) > 50: if m > 0: yr = yr + 100 else: yr = yr - 100 # convert UTC time tuple to seconds since epoch (not timezone-adjusted) t = _timegm((yr, mon, day, hr, min, sec, tz)) if t is not None: # adjust time using timezone string, to get absolute time since epoch if tz is None: tz = "UTC" tz = tz.upper() offset = offset_from_tz_string(tz) if offset is None: return None t = t - offset return t STRICT_DATE_RE = re.compile( r"^[SMTWF][a-z][a-z], (\d\d) ([JFMASOND][a-z][a-z]) " "(\d\d\d\d) (\d\d):(\d\d):(\d\d) GMT$") WEEKDAY_RE = re.compile( r"^(?:Sun|Mon|Tue|Wed|Thu|Fri|Sat)[a-z]*,?\s*", re.I) LOOSE_HTTP_DATE_RE = re.compile( r"""^ (\d\d?) # day (?:\s+|[-\/]) (\w+) # month (?:\s+|[-\/]) (\d+) # year (?: (?:\s+|:) # separator before clock (\d\d?):(\d\d) # hour:min (?::(\d\d))? # optional seconds )? # optional clock \s* (?: ([-+]?\d{2,4}|(?![APap][Mm]\b)[A-Za-z]+) # timezone \s* )? (?: \(\w+\) # ASCII representation of timezone in parens. \s* )?$""", re.X) def http2time(text): """Returns time in seconds since epoch of time represented by a string. Return value is an integer. None is returned if the format of str is unrecognized, the time is outside the representable range, or the timezone string is not recognized. If the string contains no timezone, UTC is assumed. The timezone in the string may be numerical (like "-0800" or "+0100") or a string timezone (like "UTC", "GMT", "BST" or "EST"). Currently, only the timezone strings equivalent to UTC (zero offset) are known to the function. The function loosely parses the following formats: Wed, 09 Feb 1994 22:23:32 GMT -- HTTP format Tuesday, 08-Feb-94 14:15:29 GMT -- old rfc850 HTTP format Tuesday, 08-Feb-1994 14:15:29 GMT -- broken rfc850 HTTP format 09 Feb 1994 22:23:32 GMT -- HTTP format (no weekday) 08-Feb-94 14:15:29 GMT -- rfc850 format (no weekday) 08-Feb-1994 14:15:29 GMT -- broken rfc850 format (no weekday) The parser ignores leading and trailing whitespace. The time may be absent. If the year is given with only 2 digits, the function will select the century that makes the year closest to the current date. """ # fast exit for strictly conforming string m = STRICT_DATE_RE.search(text) if m: g = m.groups() mon = MONTHS_LOWER.index(g[1].lower()) + 1 tt = (int(g[2]), mon, int(g[0]), int(g[3]), int(g[4]), float(g[5])) return _timegm(tt) # No, we need some messy parsing... # clean up text = text.lstrip() text = WEEKDAY_RE.sub("", text, 1) # Useless weekday # tz is time zone specifier string day, mon, yr, hr, min, sec, tz = [None]*7 # loose regexp parse m = LOOSE_HTTP_DATE_RE.search(text) if m is not None: day, mon, yr, hr, min, sec, tz = m.groups() else: return None # bad format return _str2time(day, mon, yr, hr, min, sec, tz) ISO_DATE_RE = re.compile( r"""^ (\d{4}) # year [-\/]? (\d\d?) # numerical month [-\/]? (\d\d?) # day (?: (?:\s+|[-:Tt]) # separator before clock (\d\d?):?(\d\d) # hour:min (?::?(\d\d(?:\.\d*)?))? # optional seconds (and fractional) )? # optional clock \s* (?: ([-+]?\d\d?:?(:?\d\d)? |Z|z) # timezone (Z is "zero meridian", i.e. GMT) \s* )?$""", re.X) def iso2time(text): """ As for http2time, but parses the ISO 8601 formats: 1994-02-03 14:15:29 -0100 -- ISO 8601 format 1994-02-03 14:15:29 -- zone is optional 1994-02-03 -- only date 1994-02-03T14:15:29 -- Use T as separator 19940203T141529Z -- ISO 8601 compact format 19940203 -- only date """ # clean up text = text.lstrip() # tz is time zone specifier string day, mon, yr, hr, min, sec, tz = [None]*7 # loose regexp parse m = ISO_DATE_RE.search(text) if m is not None: # XXX there's an extra bit of the timezone I'm ignoring here: is # this the right thing to do? yr, mon, day, hr, min, sec, tz, _ = m.groups() else: return None # bad format return _str2time(day, mon, yr, hr, min, sec, tz) # Header parsing # ----------------------------------------------------------------------------- def unmatched(match): """Return unmatched part of re.Match object.""" start, end = match.span(0) return match.string[:start]+match.string[end:] HEADER_TOKEN_RE = re.compile(r"^\s*([^=\s;,]+)") HEADER_QUOTED_VALUE_RE = re.compile(r"^\s*=\s*\"([^\"\\]*(?:\\.[^\"\\]*)*)\"") HEADER_VALUE_RE = re.compile(r"^\s*=\s*([^\s;,]*)") HEADER_ESCAPE_RE = re.compile(r"\\(.)") def split_header_words(header_values): r"""Parse header values into a list of lists containing key,value pairs. The function knows how to deal with ",", ";" and "=" as well as quoted values after "=". A list of space separated tokens are parsed as if they were separated by ";". If the header_values passed as argument contains multiple values, then they are treated as if they were a single value separated by comma ",". This means that this function is useful for parsing header fields that follow this syntax (BNF as from the HTTP/1.1 specification, but we relax the requirement for tokens). headers = #header header = (token | parameter) *( [";"] (token | parameter)) token = 1*<any CHAR except CTLs or separators> separators = "(" | ")" | "<" | ">" | "@" | "," | ";" | ":" | "\" | <"> | "/" | "[" | "]" | "?" | "=" | "{" | "}" | SP | HT quoted-string = ( <"> *(qdtext | quoted-pair ) <"> ) qdtext = <any TEXT except <">> quoted-pair = "\" CHAR parameter = attribute "=" value attribute = token value = token | quoted-string Each header is represented by a list of key/value pairs. The value for a simple token (not part of a parameter) is None. Syntactically incorrect headers will not necessarily be parsed as you would want. This is easier to describe with some examples: >>> split_header_words(['foo="bar"; port="80,81"; discard, bar=baz']) [[('foo', 'bar'), ('port', '80,81'), ('discard', None)], [('bar', 'baz')]] >>> split_header_words(['text/html; charset="iso-8859-1"']) [[('text/html', None), ('charset', 'iso-8859-1')]] >>> split_header_words([r'Basic realm="\"foo\bar\""']) [[('Basic', None), ('realm', '"foobar"')]] """ assert not isinstance(header_values, basestring) result = [] for text in header_values: orig_text = text pairs = [] while text: m = HEADER_TOKEN_RE.search(text) if m: text = unmatched(m) name = m.group(1) m = HEADER_QUOTED_VALUE_RE.search(text) if m: # quoted value text = unmatched(m) value = m.group(1) value = HEADER_ESCAPE_RE.sub(r"\1", value) else: m = HEADER_VALUE_RE.search(text) if m: # unquoted value text = unmatched(m) value = m.group(1) value = value.rstrip() else: # no value, a lone token value = None pairs.append((name, value)) elif text.lstrip().startswith(","): # concatenated headers, as per RFC 2616 section 4.2 text = text.lstrip()[1:] if pairs: result.append(pairs) pairs = [] else: # skip junk non_junk, nr_junk_chars = re.subn("^[=\s;]*", "", text) assert nr_junk_chars > 0, ( "split_header_words bug: '%s', '%s', %s" % (orig_text, text, pairs)) text = non_junk if pairs: result.append(pairs) return result HEADER_JOIN_ESCAPE_RE = re.compile(r"([\"\\])") def join_header_words(lists): """Do the inverse (almost) of the conversion done by split_header_words. Takes a list of lists of (key, value) pairs and produces a single header value. Attribute values are quoted if needed. >>> join_header_words([[("text/plain", None), ("charset", "iso-8859/1")]]) 'text/plain; charset="iso-8859/1"' >>> join_header_words([[("text/plain", None)], [("charset", "iso-8859/1")]]) 'text/plain, charset="iso-8859/1"' """ headers = [] for pairs in lists: attr = [] for k, v in pairs: if v is not None: if not re.search(r"^\w+$", v): v = HEADER_JOIN_ESCAPE_RE.sub(r"\\\1", v) # escape " and \ v = '"%s"' % v k = "%s=%s" % (k, v) attr.append(k) if attr: headers.append("; ".join(attr)) return ", ".join(headers) def _strip_quotes(text): if text.startswith('"'): text = text[1:] if text.endswith('"'): text = text[:-1] return text def parse_ns_headers(ns_headers): """Ad-hoc parser for Netscape protocol cookie-attributes. The old Netscape cookie format for Set-Cookie can for instance contain an unquoted "," in the expires field, so we have to use this ad-hoc parser instead of split_header_words. XXX This may not make the best possible effort to parse all the crap that Netscape Cookie headers contain. Ronald Tschalar's HTTPClient parser is probably better, so could do worse than following that if this ever gives any trouble. Currently, this is also used for parsing RFC 2109 cookies. """ known_attrs = ("expires", "domain", "path", "secure", # RFC 2109 attrs (may turn up in Netscape cookies, too) "version", "port", "max-age") result = [] for ns_header in ns_headers: pairs = [] version_set = False # XXX: The following does not strictly adhere to RFCs in that empty # names and values are legal (the former will only appear once and will # be overwritten if multiple occurrences are present). This is # mostly to deal with backwards compatibility. for ii, param in enumerate(ns_header.split(';')): param = param.strip() key, sep, val = param.partition('=') key = key.strip() if not key: if ii == 0: break else: continue # allow for a distinction between present and empty and missing # altogether val = val.strip() if sep else None if ii != 0: lc = key.lower() if lc in known_attrs: key = lc if key == "version": # This is an RFC 2109 cookie. if val is not None: val = _strip_quotes(val) version_set = True elif key == "expires": # convert expires date to seconds since epoch if val is not None: val = http2time(_strip_quotes(val)) # None if invalid pairs.append((key, val)) if pairs: if not version_set: pairs.append(("version", "0")) result.append(pairs) return result IPV4_RE = re.compile(r"\.\d+$") def is_HDN(text): """Return True if text is a host domain name.""" # XXX # This may well be wrong. Which RFC is HDN defined in, if any (for # the purposes of RFC 2965)? # For the current implementation, what about IPv6? Remember to look # at other uses of IPV4_RE also, if change this. if IPV4_RE.search(text): return False if text == "": return False if text[0] == "." or text[-1] == ".": return False return True def domain_match(A, B): """Return True if domain A domain-matches domain B, according to RFC 2965. A and B may be host domain names or IP addresses. RFC 2965, section 1: Host names can be specified either as an IP address or a HDN string. Sometimes we compare one host name with another. (Such comparisons SHALL be case-insensitive.) Host A's name domain-matches host B's if * their host name strings string-compare equal; or * A is a HDN string and has the form NB, where N is a non-empty name string, B has the form .B', and B' is a HDN string. (So, x.y.com domain-matches .Y.com but not Y.com.) Note that domain-match is not a commutative operation: a.b.c.com domain-matches .c.com, but not the reverse. """ # Note that, if A or B are IP addresses, the only relevant part of the # definition of the domain-match algorithm is the direct string-compare. A = A.lower() B = B.lower() if A == B: return True if not is_HDN(A): return False i = A.rfind(B) if i == -1 or i == 0: # A does not have form NB, or N is the empty string return False if not B.startswith("."): return False if not is_HDN(B[1:]): return False return True def liberal_is_HDN(text): """Return True if text is a sort-of-like a host domain name. For accepting/blocking domains. """ if IPV4_RE.search(text): return False return True def user_domain_match(A, B): """For blocking/accepting domains. A and B may be host domain names or IP addresses. """ A = A.lower() B = B.lower() if not (liberal_is_HDN(A) and liberal_is_HDN(B)): if A == B: # equal IP addresses return True return False initial_dot = B.startswith(".") if initial_dot and A.endswith(B): return True if not initial_dot and A == B: return True return False cut_port_re = re.compile(r":\d+$") def request_host(request): """Return request-host, as defined by RFC 2965. Variation from RFC: returned value is lowercased, for convenient comparison. """ url = request.get_full_url() host = urlparse.urlparse(url)[1] if host == "": host = request.get_header("Host", "") # remove port, if present host = cut_port_re.sub("", host, 1) return host.lower() def eff_request_host(request): """Return a tuple (request-host, effective request-host name). As defined by RFC 2965, except both are lowercased. """ erhn = req_host = request_host(request) if req_host.find(".") == -1 and not IPV4_RE.search(req_host): erhn = req_host + ".local" return req_host, erhn def request_path(request): """Path component of request-URI, as defined by RFC 2965.""" url = request.get_full_url() parts = urlparse.urlsplit(url) path = escape_path(parts.path) if not path.startswith("/"): # fix bad RFC 2396 absoluteURI path = "/" + path return path def request_port(request): host = request.get_host() i = host.find(':') if i >= 0: port = host[i+1:] try: int(port) except ValueError: _debug("nonnumeric port: '%s'", port) return None else: port = DEFAULT_HTTP_PORT return port # Characters in addition to A-Z, a-z, 0-9, '_', '.', and '-' that don't # need to be escaped to form a valid HTTP URL (RFCs 2396 and 1738). HTTP_PATH_SAFE = "%/;:@&=+$,!~*'()" ESCAPED_CHAR_RE = re.compile(r"%([0-9a-fA-F][0-9a-fA-F])") def uppercase_escaped_char(match): return "%%%s" % match.group(1).upper() def escape_path(path): """Escape any invalid characters in HTTP URL, and uppercase all escapes.""" # There's no knowing what character encoding was used to create URLs # containing %-escapes, but since we have to pick one to escape invalid # path characters, we pick UTF-8, as recommended in the HTML 4.0 # specification: # http://www.w3.org/TR/REC-html40/appendix/notes.html#h-B.2.1 # And here, kind of: draft-fielding-uri-rfc2396bis-03 # (And in draft IRI specification: draft-duerst-iri-05) # (And here, for new URI schemes: RFC 2718) if isinstance(path, unicode): path = path.encode("utf-8") path = urllib.quote(path, HTTP_PATH_SAFE) path = ESCAPED_CHAR_RE.sub(uppercase_escaped_char, path) return path def reach(h): """Return reach of host h, as defined by RFC 2965, section 1. The reach R of a host name H is defined as follows: * If - H is the host domain name of a host; and, - H has the form A.B; and - A has no embedded (that is, interior) dots; and - B has at least one embedded dot, or B is the string "local". then the reach of H is .B. * Otherwise, the reach of H is H. >>> reach("www.acme.com") '.acme.com' >>> reach("acme.com") 'acme.com' >>> reach("acme.local") '.local' """ i = h.find(".") if i >= 0: #a = h[:i] # this line is only here to show what a is b = h[i+1:] i = b.find(".") if is_HDN(h) and (i >= 0 or b == "local"): return "."+b return h def is_third_party(request): """ RFC 2965, section 3.3.6: An unverifiable transaction is to a third-party host if its request- host U does not domain-match the reach R of the request-host O in the origin transaction. """ req_host = request_host(request) if not domain_match(req_host, reach(request.get_origin_req_host())): return True else: return False class Cookie: """HTTP Cookie. This class represents both Netscape and RFC 2965 cookies. This is deliberately a very simple class. It just holds attributes. It's possible to construct Cookie instances that don't comply with the cookie standards. CookieJar.make_cookies is the factory function for Cookie objects -- it deals with cookie parsing, supplying defaults, and normalising to the representation used in this class. CookiePolicy is responsible for checking them to see whether they should be accepted from and returned to the server. Note that the port may be present in the headers, but unspecified ("Port" rather than"Port=80", for example); if this is the case, port is None. """ def __init__(self, version, name, value, port, port_specified, domain, domain_specified, domain_initial_dot, path, path_specified, secure, expires, discard, comment, comment_url, rest, rfc2109=False, ): if version is not None: version = int(version) if expires is not None: expires = int(expires) if port is None and port_specified is True: raise ValueError("if port is None, port_specified must be false") self.version = version self.name = name self.value = value self.port = port self.port_specified = port_specified # normalise case, as per RFC 2965 section 3.3.3 self.domain = domain.lower() self.domain_specified = domain_specified # Sigh. We need to know whether the domain given in the # cookie-attribute had an initial dot, in order to follow RFC 2965 # (as clarified in draft errata). Needed for the returned $Domain # value. self.domain_initial_dot = domain_initial_dot self.path = path self.path_specified = path_specified self.secure = secure self.expires = expires self.discard = discard self.comment = comment self.comment_url = comment_url self.rfc2109 = rfc2109 self._rest = copy.copy(rest) def has_nonstandard_attr(self, name): return name in self._rest def get_nonstandard_attr(self, name, default=None): return self._rest.get(name, default) def set_nonstandard_attr(self, name, value): self._rest[name] = value def is_expired(self, now=None): if now is None: now = time.time() if (self.expires is not None) and (self.expires <= now): return True return False def __str__(self): if self.port is None: p = "" else: p = ":"+self.port limit = self.domain + p + self.path if self.value is not None: namevalue = "%s=%s" % (self.name, self.value) else: namevalue = self.name return "<Cookie %s for %s>" % (namevalue, limit) def __repr__(self): args = [] for name in ("version", "name", "value", "port", "port_specified", "domain", "domain_specified", "domain_initial_dot", "path", "path_specified", "secure", "expires", "discard", "comment", "comment_url", ): attr = getattr(self, name) args.append("%s=%s" % (name, repr(attr))) args.append("rest=%s" % repr(self._rest)) args.append("rfc2109=%s" % repr(self.rfc2109)) return "Cookie(%s)" % ", ".join(args) class CookiePolicy: """Defines which cookies get accepted from and returned to server. May also modify cookies, though this is probably a bad idea. The subclass DefaultCookiePolicy defines the standard rules for Netscape and RFC 2965 cookies -- override that if you want a customised policy. """ def set_ok(self, cookie, request): """Return true if (and only if) cookie should be accepted from server. Currently, pre-expired cookies never get this far -- the CookieJar class deletes such cookies itself. """ raise NotImplementedError() def return_ok(self, cookie, request): """Return true if (and only if) cookie should be returned to server.""" raise NotImplementedError() def domain_return_ok(self, domain, request): """Return false if cookies should not be returned, given cookie domain. """ return True def path_return_ok(self, path, request): """Return false if cookies should not be returned, given cookie path. """ return True class DefaultCookiePolicy(CookiePolicy): """Implements the standard rules for accepting and returning cookies.""" DomainStrictNoDots = 1 DomainStrictNonDomain = 2 DomainRFC2965Match = 4 DomainLiberal = 0 DomainStrict = DomainStrictNoDots|DomainStrictNonDomain def __init__(self, blocked_domains=None, allowed_domains=None, netscape=True, rfc2965=False, rfc2109_as_netscape=None, hide_cookie2=False, strict_domain=False, strict_rfc2965_unverifiable=True, strict_ns_unverifiable=False, strict_ns_domain=DomainLiberal, strict_ns_set_initial_dollar=False, strict_ns_set_path=False, ): """Constructor arguments should be passed as keyword arguments only.""" self.netscape = netscape self.rfc2965 = rfc2965 self.rfc2109_as_netscape = rfc2109_as_netscape self.hide_cookie2 = hide_cookie2 self.strict_domain = strict_domain self.strict_rfc2965_unverifiable = strict_rfc2965_unverifiable self.strict_ns_unverifiable = strict_ns_unverifiable self.strict_ns_domain = strict_ns_domain self.strict_ns_set_initial_dollar = strict_ns_set_initial_dollar self.strict_ns_set_path = strict_ns_set_path if blocked_domains is not None: self._blocked_domains = tuple(blocked_domains) else: self._blocked_domains = () if allowed_domains is not None: allowed_domains = tuple(allowed_domains) self._allowed_domains = allowed_domains def blocked_domains(self): """Return the sequence of blocked domains (as a tuple).""" return self._blocked_domains def set_blocked_domains(self, blocked_domains): """Set the sequence of blocked domains.""" self._blocked_domains = tuple(blocked_domains) def is_blocked(self, domain): for blocked_domain in self._blocked_domains: if user_domain_match(domain, blocked_domain): return True return False def allowed_domains(self): """Return None, or the sequence of allowed domains (as a tuple).""" return self._allowed_domains def set_allowed_domains(self, allowed_domains): """Set the sequence of allowed domains, or None.""" if allowed_domains is not None: allowed_domains = tuple(allowed_domains) self._allowed_domains = allowed_domains def is_not_allowed(self, domain): if self._allowed_domains is None: return False for allowed_domain in self._allowed_domains: if user_domain_match(domain, allowed_domain): return False return True def set_ok(self, cookie, request): """ If you override .set_ok(), be sure to call this method. If it returns false, so should your subclass (assuming your subclass wants to be more strict about which cookies to accept). """ _debug(" - checking cookie %s=%s", cookie.name, cookie.value) assert cookie.name is not None for n in "version", "verifiability", "name", "path", "domain", "port": fn_name = "set_ok_"+n fn = getattr(self, fn_name) if not fn(cookie, request): return False return True def set_ok_version(self, cookie, request): if cookie.version is None: # Version is always set to 0 by parse_ns_headers if it's a Netscape # cookie, so this must be an invalid RFC 2965 cookie. _debug(" Set-Cookie2 without version attribute (%s=%s)", cookie.name, cookie.value) return False if cookie.version > 0 and not self.rfc2965: _debug(" RFC 2965 cookies are switched off") return False elif cookie.version == 0 and not self.netscape: _debug(" Netscape cookies are switched off") return False return True def set_ok_verifiability(self, cookie, request): if request.is_unverifiable() and is_third_party(request): if cookie.version > 0 and self.strict_rfc2965_unverifiable: _debug(" third-party RFC 2965 cookie during " "unverifiable transaction") return False elif cookie.version == 0 and self.strict_ns_unverifiable: _debug(" third-party Netscape cookie during " "unverifiable transaction") return False return True def set_ok_name(self, cookie, request): # Try and stop servers setting V0 cookies designed to hack other # servers that know both V0 and V1 protocols. if (cookie.version == 0 and self.strict_ns_set_initial_dollar and cookie.name.startswith("$")): _debug(" illegal name (starts with '$'): '%s'", cookie.name) return False return True def set_ok_path(self, cookie, request): if cookie.path_specified: req_path = request_path(request) if ((cookie.version > 0 or (cookie.version == 0 and self.strict_ns_set_path)) and not self.path_return_ok(cookie.path, request)): _debug(" path attribute %s is not a prefix of request " "path %s", cookie.path, req_path) return False return True def set_ok_domain(self, cookie, request): if self.is_blocked(cookie.domain): _debug(" domain %s is in user block-list", cookie.domain) return False if self.is_not_allowed(cookie.domain): _debug(" domain %s is not in user allow-list", cookie.domain) return False if cookie.domain_specified: req_host, erhn = eff_request_host(request) domain = cookie.domain if self.strict_domain and (domain.count(".") >= 2): # XXX This should probably be compared with the Konqueror # (kcookiejar.cpp) and Mozilla implementations, but it's a # losing battle. i = domain.rfind(".") j = domain.rfind(".", 0, i) if j == 0: # domain like .foo.bar tld = domain[i+1:] sld = domain[j+1:i] if sld.lower() in ("co", "ac", "com", "edu", "org", "net", "gov", "mil", "int", "aero", "biz", "cat", "coop", "info", "jobs", "mobi", "museum", "name", "pro", "travel", "eu") and len(tld) == 2: # domain like .co.uk _debug(" country-code second level domain %s", domain) return False if domain.startswith("."): undotted_domain = domain[1:] else: undotted_domain = domain embedded_dots = (undotted_domain.find(".") >= 0) if not embedded_dots and domain != ".local": _debug(" non-local domain %s contains no embedded dot", domain) return False if cookie.version == 0: if (not erhn.endswith(domain) and (not erhn.startswith(".") and not ("."+erhn).endswith(domain))): _debug(" effective request-host %s (even with added " "initial dot) does not end with %s", erhn, domain) return False if (cookie.version > 0 or (self.strict_ns_domain & self.DomainRFC2965Match)): if not domain_match(erhn, domain): _debug(" effective request-host %s does not domain-match " "%s", erhn, domain) return False if (cookie.version > 0 or (self.strict_ns_domain & self.DomainStrictNoDots)): host_prefix = req_host[:-len(domain)] if (host_prefix.find(".") >= 0 and not IPV4_RE.search(req_host)): _debug(" host prefix %s for domain %s contains a dot", host_prefix, domain) return False return True def set_ok_port(self, cookie, request): if cookie.port_specified: req_port = request_port(request) if req_port is None: req_port = "80" else: req_port = str(req_port) for p in cookie.port.split(","): try: int(p) except ValueError: _debug(" bad port %s (not numeric)", p) return False if p == req_port: break else: _debug(" request port (%s) not found in %s", req_port, cookie.port) return False return True def return_ok(self, cookie, request): """ If you override .return_ok(), be sure to call this method. If it returns false, so should your subclass (assuming your subclass wants to be more strict about which cookies to return). """ # Path has already been checked by .path_return_ok(), and domain # blocking done by .domain_return_ok(). _debug(" - checking cookie %s=%s", cookie.name, cookie.value) for n in "version", "verifiability", "secure", "expires", "port", "domain": fn_name = "return_ok_"+n fn = getattr(self, fn_name) if not fn(cookie, request): return False return True def return_ok_version(self, cookie, request): if cookie.version > 0 and not self.rfc2965: _debug(" RFC 2965 cookies are switched off") return False elif cookie.version == 0 and not self.netscape: _debug(" Netscape cookies are switched off") return False return True def return_ok_verifiability(self, cookie, request): if request.is_unverifiable() and is_third_party(request): if cookie.version > 0 and self.strict_rfc2965_unverifiable: _debug(" third-party RFC 2965 cookie during unverifiable " "transaction") return False elif cookie.version == 0 and self.strict_ns_unverifiable: _debug(" third-party Netscape cookie during unverifiable " "transaction") return False return True def return_ok_secure(self, cookie, request): if cookie.secure and request.get_type() != "https": _debug(" secure cookie with non-secure request") return False return True def return_ok_expires(self, cookie, request): if cookie.is_expired(self._now): _debug(" cookie expired") return False return True def return_ok_port(self, cookie, request): if cookie.port: req_port = request_port(request) if req_port is None: req_port = "80" for p in cookie.port.split(","): if p == req_port: break else: _debug(" request port %s does not match cookie port %s", req_port, cookie.port) return False return True def return_ok_domain(self, cookie, request): req_host, erhn = eff_request_host(request) domain = cookie.domain if domain and not domain.startswith("."): dotdomain = "." + domain else: dotdomain = domain # strict check of non-domain cookies: Mozilla does this, MSIE5 doesn't if (cookie.version == 0 and (self.strict_ns_domain & self.DomainStrictNonDomain) and not cookie.domain_specified and domain != erhn): _debug(" cookie with unspecified domain does not string-compare " "equal to request domain") return False if cookie.version > 0 and not domain_match(erhn, domain): _debug(" effective request-host name %s does not domain-match " "RFC 2965 cookie domain %s", erhn, domain) return False if cookie.version == 0 and not ("."+erhn).endswith(dotdomain): _debug(" request-host %s does not match Netscape cookie domain " "%s", req_host, domain) return False return True def domain_return_ok(self, domain, request): # Liberal check of. This is here as an optimization to avoid # having to load lots of MSIE cookie files unless necessary. req_host, erhn = eff_request_host(request) if not req_host.startswith("."): req_host = "."+req_host if not erhn.startswith("."): erhn = "."+erhn if domain and not domain.startswith("."): dotdomain = "." + domain else: dotdomain = domain if not (req_host.endswith(dotdomain) or erhn.endswith(dotdomain)): #_debug(" request domain %s does not match cookie domain %s", # req_host, domain) return False if self.is_blocked(domain): _debug(" domain %s is in user block-list", domain) return False if self.is_not_allowed(domain): _debug(" domain %s is not in user allow-list", domain) return False return True def path_return_ok(self, path, request): _debug("- checking cookie path=%s", path) req_path = request_path(request) pathlen = len(path) if req_path == path: return True elif (req_path.startswith(path) and (path.endswith("/") or req_path[pathlen:pathlen+1] == "/")): return True _debug(" %s does not path-match %s", req_path, path) return False def vals_sorted_by_key(adict): keys = adict.keys() keys.sort() return map(adict.get, keys) def deepvalues(mapping): """Iterates over nested mapping, depth-first, in sorted order by key.""" values = vals_sorted_by_key(mapping) for obj in values: mapping = False try: obj.items except AttributeError: pass else: mapping = True for subobj in deepvalues(obj): yield subobj if not mapping: yield obj # Used as second parameter to dict.get() method, to distinguish absent # dict key from one with a None value. class Absent: pass class CookieJar: """Collection of HTTP cookies. You may not need to know about this class: try urllib2.build_opener(HTTPCookieProcessor).open(url). """ non_word_re = re.compile(r"\W") quote_re = re.compile(r"([\"\\])") strict_domain_re = re.compile(r"\.?[^.]*") domain_re = re.compile(r"[^.]*") dots_re = re.compile(r"^\.+") magic_re = r"^\#LWP-Cookies-(\d+\.\d+)" def __init__(self, policy=None): if policy is None: policy = DefaultCookiePolicy() self._policy = policy self._cookies_lock = _threading.RLock() self._cookies = {} def set_policy(self, policy): self._policy = policy def _cookies_for_domain(self, domain, request): cookies = [] if not self._policy.domain_return_ok(domain, request): return [] _debug("Checking %s for cookies to return", domain) cookies_by_path = self._cookies[domain] for path in cookies_by_path.keys(): if not self._policy.path_return_ok(path, request): continue cookies_by_name = cookies_by_path[path] for cookie in cookies_by_name.values(): if not self._policy.return_ok(cookie, request): _debug(" not returning cookie") continue _debug(" it's a match") cookies.append(cookie) return cookies def _cookies_for_request(self, request): """Return a list of cookies to be returned to server.""" cookies = [] for domain in self._cookies.keys(): cookies.extend(self._cookies_for_domain(domain, request)) return cookies def _cookie_attrs(self, cookies): """Return a list of cookie-attributes to be returned to server. like ['foo="bar"; $Path="/"', ...] The $Version attribute is also added when appropriate (currently only once per request). """ # add cookies in order of most specific (ie. longest) path first cookies.sort(key=lambda arg: len(arg.path), reverse=True) version_set = False attrs = [] for cookie in cookies: # set version of Cookie header # XXX # What should it be if multiple matching Set-Cookie headers have # different versions themselves? # Answer: there is no answer; was supposed to be settled by # RFC 2965 errata, but that may never appear... version = cookie.version if not version_set: version_set = True if version > 0: attrs.append("$Version=%s" % version) # quote cookie value if necessary # (not for Netscape protocol, which already has any quotes # intact, due to the poorly-specified Netscape Cookie: syntax) if ((cookie.value is not None) and self.non_word_re.search(cookie.value) and version > 0): value = self.quote_re.sub(r"\\\1", cookie.value) else: value = cookie.value # add cookie-attributes to be returned in Cookie header if cookie.value is None: attrs.append(cookie.name) else: attrs.append("%s=%s" % (cookie.name, value)) if version > 0: if cookie.path_specified: attrs.append('$Path="%s"' % cookie.path) if cookie.domain.startswith("."): domain = cookie.domain if (not cookie.domain_initial_dot and domain.startswith(".")): domain = domain[1:] attrs.append('$Domain="%s"' % domain) if cookie.port is not None: p = "$Port" if cookie.port_specified: p = p + ('="%s"' % cookie.port) attrs.append(p) return attrs def add_cookie_header(self, request): """Add correct Cookie: header to request (urllib2.Request object). The Cookie2 header is also added unless policy.hide_cookie2 is true. """ _debug("add_cookie_header") self._cookies_lock.acquire() try: self._policy._now = self._now = int(time.time()) cookies = self._cookies_for_request(request) attrs = self._cookie_attrs(cookies) if attrs: if not request.has_header("Cookie"): request.add_unredirected_header( "Cookie", "; ".join(attrs)) # if necessary, advertise that we know RFC 2965 if (self._policy.rfc2965 and not self._policy.hide_cookie2 and not request.has_header("Cookie2")): for cookie in cookies: if cookie.version != 1: request.add_unredirected_header("Cookie2", '$Version="1"') break finally: self._cookies_lock.release() self.clear_expired_cookies() def _normalized_cookie_tuples(self, attrs_set): """Return list of tuples containing normalised cookie information. attrs_set is the list of lists of key,value pairs extracted from the Set-Cookie or Set-Cookie2 headers. Tuples are name, value, standard, rest, where name and value are the cookie name and value, standard is a dictionary containing the standard cookie-attributes (discard, secure, version, expires or max-age, domain, path and port) and rest is a dictionary containing the rest of the cookie-attributes. """ cookie_tuples = [] boolean_attrs = "discard", "secure" value_attrs = ("version", "expires", "max-age", "domain", "path", "port", "comment", "commenturl") for cookie_attrs in attrs_set: name, value = cookie_attrs[0] # Build dictionary of standard cookie-attributes (standard) and # dictionary of other cookie-attributes (rest). # Note: expiry time is normalised to seconds since epoch. V0 # cookies should have the Expires cookie-attribute, and V1 cookies # should have Max-Age, but since V1 includes RFC 2109 cookies (and # since V0 cookies may be a mish-mash of Netscape and RFC 2109), we # accept either (but prefer Max-Age). max_age_set = False bad_cookie = False standard = {} rest = {} for k, v in cookie_attrs[1:]: lc = k.lower() # don't lose case distinction for unknown fields if lc in value_attrs or lc in boolean_attrs: k = lc if k in boolean_attrs and v is None: # boolean cookie-attribute is present, but has no value # (like "discard", rather than "port=80") v = True if k in standard: # only first value is significant continue if k == "domain": if v is None: _debug(" missing value for domain attribute") bad_cookie = True break # RFC 2965 section 3.3.3 v = v.lower() if k == "expires": if max_age_set: # Prefer max-age to expires (like Mozilla) continue if v is None: _debug(" missing or invalid value for expires " "attribute: treating as session cookie") continue if k == "max-age": max_age_set = True try: v = int(v) except ValueError: _debug(" missing or invalid (non-numeric) value for " "max-age attribute") bad_cookie = True break # convert RFC 2965 Max-Age to seconds since epoch # XXX Strictly you're supposed to follow RFC 2616 # age-calculation rules. Remember that zero Max-Age # is a request to discard (old and new) cookie, though. k = "expires" v = self._now + v if (k in value_attrs) or (k in boolean_attrs): if (v is None and k not in ("port", "comment", "commenturl")): _debug(" missing value for %s attribute" % k) bad_cookie = True break standard[k] = v else: rest[k] = v if bad_cookie: continue cookie_tuples.append((name, value, standard, rest)) return cookie_tuples def _cookie_from_cookie_tuple(self, tup, request): # standard is dict of standard cookie-attributes, rest is dict of the # rest of them name, value, standard, rest = tup domain = standard.get("domain", Absent) path = standard.get("path", Absent) port = standard.get("port", Absent) expires = standard.get("expires", Absent) # set the easy defaults version = standard.get("version", None) if version is not None: try: version = int(version) except ValueError: return None # invalid version, ignore cookie secure = standard.get("secure", False) # (discard is also set if expires is Absent) discard = standard.get("discard", False) comment = standard.get("comment", None) comment_url = standard.get("commenturl", None) # set default path if path is not Absent and path != "": path_specified = True path = escape_path(path) else: path_specified = False path = request_path(request) i = path.rfind("/") if i != -1: if version == 0: # Netscape spec parts company from reality here path = path[:i] else: path = path[:i+1] if len(path) == 0: path = "/" # set default domain domain_specified = domain is not Absent # but first we have to remember whether it starts with a dot domain_initial_dot = False if domain_specified: domain_initial_dot = bool(domain.startswith(".")) if domain is Absent: req_host, erhn = eff_request_host(request) domain = erhn elif not domain.startswith("."): domain = "."+domain # set default port port_specified = False if port is not Absent: if port is None: # Port attr present, but has no value: default to request port. # Cookie should then only be sent back on that port. port = request_port(request) else: port_specified = True port = re.sub(r"\s+", "", port) else: # No port attr present. Cookie can be sent back on any port. port = None # set default expires and discard if expires is Absent: expires = None discard = True elif expires <= self._now: # Expiry date in past is request to delete cookie. This can't be # in DefaultCookiePolicy, because can't delete cookies there. try: self.clear(domain, path, name) except KeyError: pass _debug("Expiring cookie, domain='%s', path='%s', name='%s'", domain, path, name) return None return Cookie(version, name, value, port, port_specified, domain, domain_specified, domain_initial_dot, path, path_specified, secure, expires, discard, comment, comment_url, rest) def _cookies_from_attrs_set(self, attrs_set, request): cookie_tuples = self._normalized_cookie_tuples(attrs_set) cookies = [] for tup in cookie_tuples: cookie = self._cookie_from_cookie_tuple(tup, request) if cookie: cookies.append(cookie) return cookies def _process_rfc2109_cookies(self, cookies): rfc2109_as_ns = getattr(self._policy, 'rfc2109_as_netscape', None) if rfc2109_as_ns is None: rfc2109_as_ns = not self._policy.rfc2965 for cookie in cookies: if cookie.version == 1: cookie.rfc2109 = True if rfc2109_as_ns: # treat 2109 cookies as Netscape cookies rather than # as RFC2965 cookies cookie.version = 0 def make_cookies(self, response, request): """Return sequence of Cookie objects extracted from response object.""" # get cookie-attributes for RFC 2965 and Netscape protocols headers = response.info() rfc2965_hdrs = headers.getheaders("Set-Cookie2") ns_hdrs = headers.getheaders("Set-Cookie") rfc2965 = self._policy.rfc2965 netscape = self._policy.netscape if ((not rfc2965_hdrs and not ns_hdrs) or (not ns_hdrs and not rfc2965) or (not rfc2965_hdrs and not netscape) or (not netscape and not rfc2965)): return [] # no relevant cookie headers: quick exit try: cookies = self._cookies_from_attrs_set( split_header_words(rfc2965_hdrs), request) except Exception: _warn_unhandled_exception() cookies = [] if ns_hdrs and netscape: try: # RFC 2109 and Netscape cookies ns_cookies = self._cookies_from_attrs_set( parse_ns_headers(ns_hdrs), request) except Exception: _warn_unhandled_exception() ns_cookies = [] self._process_rfc2109_cookies(ns_cookies) # Look for Netscape cookies (from Set-Cookie headers) that match # corresponding RFC 2965 cookies (from Set-Cookie2 headers). # For each match, keep the RFC 2965 cookie and ignore the Netscape # cookie (RFC 2965 section 9.1). Actually, RFC 2109 cookies are # bundled in with the Netscape cookies for this purpose, which is # reasonable behaviour. if rfc2965: lookup = {} for cookie in cookies: lookup[(cookie.domain, cookie.path, cookie.name)] = None def no_matching_rfc2965(ns_cookie, lookup=lookup): key = ns_cookie.domain, ns_cookie.path, ns_cookie.name return key not in lookup ns_cookies = filter(no_matching_rfc2965, ns_cookies) if ns_cookies: cookies.extend(ns_cookies) return cookies def set_cookie_if_ok(self, cookie, request): """Set a cookie if policy says it's OK to do so.""" self._cookies_lock.acquire() try: self._policy._now = self._now = int(time.time()) if self._policy.set_ok(cookie, request): self.set_cookie(cookie) finally: self._cookies_lock.release() def set_cookie(self, cookie): """Set a cookie, without checking whether or not it should be set.""" c = self._cookies self._cookies_lock.acquire() try: if cookie.domain not in c: c[cookie.domain] = {} c2 = c[cookie.domain] if cookie.path not in c2: c2[cookie.path] = {} c3 = c2[cookie.path] c3[cookie.name] = cookie finally: self._cookies_lock.release() def extract_cookies(self, response, request): """Extract cookies from response, where allowable given the request.""" _debug("extract_cookies: %s", response.info()) self._cookies_lock.acquire() try: self._policy._now = self._now = int(time.time()) for cookie in self.make_cookies(response, request): if self._policy.set_ok(cookie, request): _debug(" setting cookie: %s", cookie) self.set_cookie(cookie) finally: self._cookies_lock.release() def clear(self, domain=None, path=None, name=None): """Clear some cookies. Invoking this method without arguments will clear all cookies. If given a single argument, only cookies belonging to that domain will be removed. If given two arguments, cookies belonging to the specified path within that domain are removed. If given three arguments, then the cookie with the specified name, path and domain is removed. Raises KeyError if no matching cookie exists. """ if name is not None: if (domain is None) or (path is None): raise ValueError( "domain and path must be given to remove a cookie by name") del self._cookies[domain][path][name] elif path is not None: if domain is None: raise ValueError( "domain must be given to remove cookies by path") del self._cookies[domain][path] elif domain is not None: del self._cookies[domain] else: self._cookies = {} def clear_session_cookies(self): """Discard all session cookies. Note that the .save() method won't save session cookies anyway, unless you ask otherwise by passing a true ignore_discard argument. """ self._cookies_lock.acquire() try: for cookie in self: if cookie.discard: self.clear(cookie.domain, cookie.path, cookie.name) finally: self._cookies_lock.release() def clear_expired_cookies(self): """Discard all expired cookies. You probably don't need to call this method: expired cookies are never sent back to the server (provided you're using DefaultCookiePolicy), this method is called by CookieJar itself every so often, and the .save() method won't save expired cookies anyway (unless you ask otherwise by passing a true ignore_expires argument). """ self._cookies_lock.acquire() try: now = time.time() for cookie in self: if cookie.is_expired(now): self.clear(cookie.domain, cookie.path, cookie.name) finally: self._cookies_lock.release() def __iter__(self): return deepvalues(self._cookies) def __len__(self): """Return number of contained cookies.""" i = 0 for cookie in self: i = i + 1 return i def __repr__(self): r = [] for cookie in self: r.append(repr(cookie)) return "<%s[%s]>" % (self.__class__.__name__, ", ".join(r)) def __str__(self): r = [] for cookie in self: r.append(str(cookie)) return "<%s[%s]>" % (self.__class__.__name__, ", ".join(r)) # derives from IOError for backwards-compatibility with Python 2.4.0 class LoadError(IOError): pass class FileCookieJar(CookieJar): """CookieJar that can be loaded from and saved to a file.""" def __init__(self, filename=None, delayload=False, policy=None): """ Cookies are NOT loaded from the named file until either the .load() or .revert() method is called. """ CookieJar.__init__(self, policy) if filename is not None: try: filename+"" except: raise ValueError("filename must be string-like") self.filename = filename self.delayload = bool(delayload) def save(self, filename=None, ignore_discard=False, ignore_expires=False): """Save cookies to a file.""" raise NotImplementedError() def load(self, filename=None, ignore_discard=False, ignore_expires=False): """Load cookies from a file.""" if filename is None: if self.filename is not None: filename = self.filename else: raise ValueError(MISSING_FILENAME_TEXT) f = open(filename) try: self._really_load(f, filename, ignore_discard, ignore_expires) finally: f.close() def revert(self, filename=None, ignore_discard=False, ignore_expires=False): """Clear all cookies and reload cookies from a saved file. Raises LoadError (or IOError) if reversion is not successful; the object's state will not be altered if this happens. """ if filename is None: if self.filename is not None: filename = self.filename else: raise ValueError(MISSING_FILENAME_TEXT) self._cookies_lock.acquire() try: old_state = copy.deepcopy(self._cookies) self._cookies = {} try: self.load(filename, ignore_discard, ignore_expires) except (LoadError, IOError): self._cookies = old_state raise finally: self._cookies_lock.release() from _LWPCookieJar import LWPCookieJar, lwp_cookie_str from _MozillaCookieJar import MozillaCookieJar
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