F [dialog] offer to create backup. refactor to use l.c.shellutils.ASK
"""Twisted request handler for CubicWeb
:organization: Logilab
:copyright: 2001-2009 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"
from datetime import datetime
from twisted.web2 import http, http_headers
from cubicweb.web import DirectResponse
from cubicweb.web.request import CubicWebRequestBase
from cubicweb.web.httpcache import GMTOFFSET
def cleanup_files(dct, encoding):
d = {}
for k, infos in dct.items():
for (filename, mt, stream) in infos:
if filename:
# XXX: suppose that no file submitted <-> no filename
filename = unicode(filename, encoding)
mt = u'%s/%s' % (mt.mediaType, mt.mediaSubtype)
d[k] = (filename, mt, stream)
return d
class CubicWebTwistedRequestAdapter(CubicWebRequestBase):
def __init__(self, req, vreg, https, base_url):
self._twreq = req
self._base_url = base_url
super(CubicWebTwistedRequestAdapter, self).__init__(vreg, https, req.args)
self.form.update(cleanup_files(req.files, self.encoding))
# prepare output headers
self.headers_out = http_headers.Headers()
self._headers = req.headers
def base_url(self):
"""return the root url of the instance"""
return self._base_url
def http_method(self):
"""returns 'POST', 'GET', 'HEAD', etc."""
return self._twreq.method
def relative_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 '/'
if not includeparams:
path = path.split('?', 1)[0]
return path
def get_header(self, header, default=None, raw=True):
"""return the value associated with the given input header,
raise KeyError if the header is not set
"""
if raw:
return self._twreq.headers.getRawHeaders(header, [default])[0]
return self._twreq.headers.getHeader(header, default)
def set_header(self, header, value, raw=True):
"""set an output HTTP header"""
if raw:
# adding encoded header is important, else page content
# will be reconverted back to unicode and apart unefficiency, this
# may cause decoding problem (e.g. when downloading a file)
self.headers_out.setRawHeaders(header, [str(value)])
else:
self.headers_out.setHeader(header, value)
def add_header(self, header, value):
"""add an output HTTP header"""
# adding encoded header is important, else page content
# will be reconverted back to unicode and apart unefficiency, this
# may cause decoding problem (e.g. when downloading a file)
self.headers_out.addRawHeader(header, str(value))
def remove_header(self, header):
"""remove an output HTTP header"""
self.headers_out.removeHeader(header)
def _validate_cache(self):
"""raise a `DirectResponse` exception if a cached page along the way
exists and is still usable
"""
if self.get_header('Cache-Control') in ('max-age=0', 'no-cache'):
# Expires header seems to be required by IE7
self.add_header('Expires', 'Sat, 01 Jan 2000 00:00:00 GMT')
return
try:
http.checkPreconditions(self._twreq, _PreResponse(self))
except http.HTTPError, ex:
self.info('valid http cache, no actual rendering')
raise DirectResponse(ex.response)
# Expires header seems to be required by IE7
self.add_header('Expires', 'Sat, 01 Jan 2000 00:00:00 GMT')
def header_accept_language(self):
"""returns an ordered list of preferred languages"""
acceptedlangs = self.get_header('Accept-Language', raw=False) or {}
for lang, _ in sorted(acceptedlangs.iteritems(), key=lambda x: x[1],
reverse=True):
lang = lang.split('-')[0]
yield lang
def header_if_modified_since(self):
"""If the HTTP header If-modified-since is set, return the equivalent
mx date time value (GMT), else return None
"""
mtime = self.get_header('If-modified-since', raw=False)
if mtime:
# :/ twisted is returned a localized time stamp
return datetime.fromtimestamp(mtime) + GMTOFFSET
return None
class _PreResponse(object):
def __init__(self, request):
self.headers = request.headers_out
self.code = 200