from Common import *

from MiscUtils.Funcs import positive_id

# If this is Python 2.2 or greater, import the standard Cookie module
# as CookieEngine. Otherwise, import WebUtils.Cookie as CookieEngine.
# This is because there is a nasty bug in the Cookie.py module
# included in Python 2.1 and earlier.

pyVer = getattr(sys, 'version_info', None)
if pyVer and pyVer[:2] >= (2, 2):
	# Get Python's Cookie module. We have to do some work since
	# it has the same name as we do. So we'll strip out anything
	# from the path that might cause us to import from the WebKit
	# directory, then import Cookie using that restricted path --
	# that ought to ensure that we're using Python's module.
	import imp
	path = []
	thisDir = os.path.abspath(os.path.dirname(__file__))
	for dir in sys.path:
		if not dir or dir == '.':
			continue
		if os.path.abspath(dir) == thisDir:
			continue
		path.append(dir)
	file, pathname, description = imp.find_module('Cookie', path)
	try:
		CookieEngine = imp.load_module('Cookie', file, pathname, description)
	finally:
		if file:
			file.close()
else:
	# For Python versions < 2.2, we are including a copy of the
	# standard Cookie.py module from Python 2.2, but modified to
	# work with Python 1.5.2 and up.
	from WebUtils import Cookie
	CookieEngine = Cookie
	del Cookie


class Cookie(Object):
	"""Delicious cookies.

	Cookie is used to create cookies that have additional attributes
	beyond their value.

	Note that web browsers don't typically send any information with
	the cookie other than its value. Therefore `HTTPRequest.cookie`
	simply returns a value such as an integer or a string.

	When the server sends cookies back to the browser, it can send
	a cookie that simply has a value, or the cookie can be
	accompanied by various attributes (domain, path, max-age, ...)
	as described in `RFC 2109`_. Therefore, in HTTPResponse,
	`setCookie` can take either an instance of the Cookie class,
	as defined in this module, or a value.

	Note that Cookies values get pickled (see the `pickle` module),
	so you can set and get cookies that are integers, lists,
	dictionaries, etc.

	.. _`RFC 2109`: ftp://ftp.isi.edu/in-notes/rfc2109.txt

	"""

	# Future
	#
	# * This class should provide error checking in the setFoo()
	#   methods. Or maybe our internal Cookie implementation
	#   already does that?
	# * This implementation is probably not as efficient as it
	#   should be, [a] it works and [b] the interface is stable.
	#   We can optimize later.


	## Init ##

	def __init__(self, name, value):
		"""Create a cookie.

		Properties other than `name` and `value` are set with methods.

		"""

		self._cookies = CookieEngine.SimpleCookie()
		self._name = name
		self._value = value
		self._cookies[name] = value
		self._cookie = self._cookies[name]

	def __repr__(self):
		return ('%s(id=0x%x, name=%r, domain=%r, '
				'path=%r, value=%r, expires=%r, maxAge=%r)'
			% (self.__class__.__name__, positive_id(self),
				self.name(), self.domain(),
				self.path(), self.value(), self.expires(), self.maxAge()))


	## Accessors ##

	def comment(self):
		return self._cookie['comment']

	def domain(self):
		return self._cookie['domain']

	def maxAge(self):
		return self._cookie['max-age']

	def expires(self):
		return self._cookie['expires']

	def name(self):
		return self._name

	def path(self):
		return self._cookie['path']

	def isSecure(self):
		return self._cookie['secure']

	def value(self):
		return self._value

	def version(self):
		return self._cookie['version']


	## Setters ##

	def setComment(self, comment):
		self._cookie['comment'] = comment

	def setDomain(self, domain):
		self._cookie['domain'] = domain

	def setExpires(self, expires):
		self._cookie['expires'] = expires

	def setMaxAge(self, maxAge):
		self._cookie['max-age'] = maxAge

	def setPath(self, path):
		self._cookie['path'] = path

	def setSecure(self, secure=True):
		self._cookie['secure'] = secure

	def setValue(self, value):
		self._value = value
		self._cookies[self._name] = value

	def setVersion(self, version):
		self._cookie['version'] = version


	## Misc ##

	def delete(self):
		"""Delete a cookie.

		When sent, this should delete the cookie from the user's
		browser, by making it empty, expiring it in the past,
		and setting its max-age to 0. One of these will delete
		the cookie for any browser (which one actually works
		depends on the browser).

		"""
		self._value = ''
		self._cookie['expires'] = "Mon, 01-Jan-1900 00:00:00 GMT"
		self._cookie['max-age'] = 0

	def headerValue(self):
		"""Return header value.

		Returns a string with the value that should be used
		in the HTTP headers.

		"""
		items = self._cookies.items()
		assert len(items) == 1
		return items[0][1].OutputString()
