"""Twisted request handler for CubicWeb:organization: Logilab:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses"""__docformat__="restructuredtext en"fromdatetimeimportdatetimefromtwisted.webimporthttpfromcubicweb.webimportDirectResponsefromcubicweb.web.requestimportCubicWebRequestBasefromcubicweb.web.httpcacheimportGMTOFFSETfromcubicweb.web.http_headersimportHeadersfromcubicweb.etwist.httpimportnot_modified_responseclassCubicWebTwistedRequestAdapter(CubicWebRequestBase):def__init__(self,req,vreg,https,base_url):self._twreq=reqself._base_url=base_urlsuper(CubicWebTwistedRequestAdapter,self).__init__(vreg,https,req.args)forkey,(name,stream)inreq.files.iteritems():ifnameisNone:self.form[key]=(name,stream)else:self.form[key]=(unicode(name,self.encoding),stream)# XXX can't we keep received_headers?self._headers_in=Headers()fork,vinreq.received_headers.iteritems():self._headers_in.addRawHeader(k,v)defbase_url(self):"""return the root url of the instance"""returnself._base_urldefhttp_method(self):"""returns 'POST', 'GET', 'HEAD', etc."""returnself._twreq.methoddefrelative_path(self,includeparams=True):"""return the normalized path of the request (ie at least relative to the instance's root, but some other normalization may be needed so that the returned path may be used to compare to generated urls :param includeparams: boolean indicating if GET form parameters should be kept in the path """path=self._twreq.uri[1:]# remove the root '/'ifnotincludeparams:path=path.split('?',1)[0]returnpathdefget_header(self,header,default=None,raw=True):"""return the value associated with the given input header, raise KeyError if the header is not set """ifraw:returnself._headers_in.getRawHeaders(header,[default])[0]returnself._headers_in.getHeader(header,default)def_validate_cache(self):"""raise a `DirectResponse` exception if a cached page along the way exists and is still usable """ifself.get_header('Cache-Control')in('max-age=0','no-cache'):# Expires header seems to be required by IE7self.add_header('Expires','Sat, 01 Jan 2000 00:00:00 GMT')return# when using both 'Last-Modified' and 'ETag' response headers# (i.e. using respectively If-Modified-Since and If-None-Match request# headers, see# http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.3.4 for# referencecached_because_not_modified_since=Falselast_modified=self.headers_out.getHeader('last-modified')iflast_modifiedisnotNone:cached_because_not_modified_since=(self._twreq.setLastModified(last_modified)==http.CACHED)ifnotcached_because_not_modified_since:returncached_because_etag_is_same=Falseetag=self.headers_out.getRawHeaders('etag')ifetagisnotNone:cached_because_etag_is_same=self._twreq.setETag(etag[0])==http.CACHEDifcached_because_etag_is_same:response=not_modified_response(self._twreq,self._headers_in)raiseDirectResponse(response)# Expires header seems to be required by IE7self.add_header('Expires','Sat, 01 Jan 2000 00:00:00 GMT')defheader_accept_language(self):"""returns an ordered list of preferred languages"""acceptedlangs=self.get_header('Accept-Language',raw=False)or{}forlang,_insorted(acceptedlangs.iteritems(),key=lambdax:x[1],reverse=True):lang=lang.split('-')[0]yieldlangdefheader_if_modified_since(self):"""If the HTTP header If-modified-since is set, return the equivalent date time value (GMT), else return None """mtime=self.get_header('If-modified-since',raw=False)ifmtime:# :/ twisted is returned a localized time stampreturndatetime.fromtimestamp(mtime)+GMTOFFSETreturnNone