etwist/request.py
author Stephanie Marcu <stephanie.marcu@logilab.fr>
Wed, 16 Jun 2010 09:30:30 +0200
branchstable
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permissions -rw-r--r--
[c-c exlog] fix code and documentation
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""Twisted request handler for CubicWeb
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"""
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__docformat__ = "restructuredtext en"
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from datetime import datetime
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from twisted.web import http
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from cubicweb.web import DirectResponse
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from cubicweb.web.request import CubicWebRequestBase
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from cubicweb.web.httpcache import GMTOFFSET
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from cubicweb.web.http_headers import Headers
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from cubicweb.etwist.http import not_modified_response
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class CubicWebTwistedRequestAdapter(CubicWebRequestBase):
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    def __init__(self, req, vreg, https, base_url):
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        self._twreq = req
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        self._base_url = base_url
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        super(CubicWebTwistedRequestAdapter, self).__init__(vreg, https, req.args)
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        for key, (name, stream) in req.files.iteritems():
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            if name is None:
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                self.form[key] = (name, stream)
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            else:
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                self.form[key] = (unicode(name, self.encoding), stream)
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        # XXX can't we keep received_headers?
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        self._headers_in = Headers()
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        for k, v in req.received_headers.iteritems():
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            self._headers_in.addRawHeader(k, v)
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    def base_url(self):
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        """return the root url of the instance"""
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        return self._base_url
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    def http_method(self):
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        """returns 'POST', 'GET', 'HEAD', etc."""
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        return self._twreq.method
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    def relative_path(self, includeparams=True):
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        """return the normalized path of the request (ie at least relative
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        to the instance's root, but some other normalization may be needed
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        so that the returned path may be used to compare to generated urls
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        :param includeparams:
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           boolean indicating if GET form parameters should be kept in the path
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        """
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        path = self._twreq.uri[1:] # remove the root '/'
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        if not includeparams:
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            path = path.split('?', 1)[0]
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        return path
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    def get_header(self, header, default=None, raw=True):
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        """return the value associated with the given input header,
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        raise KeyError if the header is not set
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        """
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        if raw:
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            return self._headers_in.getRawHeaders(header, [default])[0]
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        return self._headers_in.getHeader(header, default)
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    def _validate_cache(self):
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        """raise a `DirectResponse` exception if a cached page along the way
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        exists and is still usable
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        """
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        if self.get_header('Cache-Control') in ('max-age=0', 'no-cache'):
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            # Expires header seems to be required by IE7
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            self.add_header('Expires', 'Sat, 01 Jan 2000 00:00:00 GMT')
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            return
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        # when using both 'Last-Modified' and 'ETag' response headers
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        # (i.e. using respectively If-Modified-Since and If-None-Match request
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        # headers, see
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        # http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.3.4 for
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        # reference
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        cached_because_not_modified_since = False
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        last_modified = self.headers_out.getHeader('last-modified')
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        if last_modified is not None:
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            cached_because_not_modified_since = (self._twreq.setLastModified(last_modified)
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                                                 == http.CACHED)
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        if not cached_because_not_modified_since:
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            return
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        cached_because_etag_is_same = False
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        etag = self.headers_out.getRawHeaders('etag')
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        if etag is not None:
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            cached_because_etag_is_same = self._twreq.setETag(etag[0]) == http.CACHED
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        if cached_because_etag_is_same:
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            response = not_modified_response(self._twreq, self._headers_in)
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            raise DirectResponse(response)
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        # Expires header seems to be required by IE7
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        self.add_header('Expires', 'Sat, 01 Jan 2000 00:00:00 GMT')
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    def header_accept_language(self):
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        """returns an ordered list of preferred languages"""
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        acceptedlangs = self.get_header('Accept-Language', raw=False) or {}
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        for lang, _ in sorted(acceptedlangs.iteritems(), key=lambda x: x[1],
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                              reverse=True):
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            lang = lang.split('-')[0]
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            yield lang
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    def header_if_modified_since(self):
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        """If the HTTP header If-modified-since is set, return the equivalent
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        date time value (GMT), else return None
0
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        """
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        mtime = self.get_header('If-modified-since', raw=False)
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        if mtime:
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            # :/ twisted is returned a localized time stamp
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            return datetime.fromtimestamp(mtime) + GMTOFFSET
0
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        return None