wsgi/request.py
author sylvain.thenault@logilab.fr
Thu, 14 May 2009 12:52:13 +0200
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"""WSGI request adapter for cubicweb
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NOTE: each docstring tagged with ``COME FROM DJANGO`` means that
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the code has been taken (or adapted) from Djanco source code :
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  http://www.djangoproject.com/
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:organization: Logilab
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:copyright: 2008 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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__docformat__ = "restructuredtext en"
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from StringIO import StringIO
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from urllib import quote
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from logilab.common.decorators import cached
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from cubicweb.web.request import CubicWebRequestBase
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from cubicweb.wsgi import (pformat, qs2dict, safe_copyfileobj, parse_file_upload,
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                        normalize_header)
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class CubicWebWsgiRequest(CubicWebRequestBase):
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    """most of this code COMES FROM DJANO
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    """
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    def __init__(self, environ, vreg, base_url=None):
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        self.environ = environ
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        self.path = environ['PATH_INFO']
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        self.method = environ['REQUEST_METHOD'].upper()
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        self._headers = dict([(normalize_header(k[5:]), v) for k, v in self.environ.items()
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                              if k.startswith('HTTP_')])
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        https = environ.get("HTTPS") in ('yes', 'on', '1')
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        self._base_url = base_url or self.application_uri()
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        post, files = self.get_posted_data()
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        super(CubicWebWsgiRequest, self).__init__(vreg, https, post)
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        if files is not None:
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            for fdef in files.itervalues():
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                fdef[0] = unicode(fdef[0], self.encoding)
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            self.form.update(files)
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        # prepare output headers
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        self.headers_out = {}
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    def __repr__(self):
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        # Since this is called as part of error handling, we need to be very
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        # robust against potentially malformed input.
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        form = pformat(self.form)
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        meta = pformat(self.environ)
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        return '<CubicWebWsgiRequest\FORM:%s,\nMETA:%s>' % \
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            (form, meta)
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    ## cubicweb request interface ################################################
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    def base_url(self):
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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.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 application'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.environ['PATH_INFO']
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        path = path[1:] # remove leading '/'
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        if includeparams:
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            qs = self.environ.get('QUERY_STRING')
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            if qs:
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                return '%s?%s' % (path, qs)
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        return path
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    def get_header(self, header, default=None):
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        """return the value associated with the given input HTTP header,
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        raise KeyError if the header is not set
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        """
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        return self._headers.get(normalize_header(header), default)
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    def set_header(self, header, value, raw=True):
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        """set an output HTTP header"""
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        assert raw, "don't know anything about non-raw headers for wsgi requests"
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        self.headers_out[header] = value
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    def add_header(self, header, value):
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        """add an output HTTP header"""
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        self.headers_out[header] = value
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    def remove_header(self, header):
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        """remove an output HTTP header"""
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        self.headers_out.pop(header, None)
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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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        mx date time value (GMT), else return None
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        """
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        return None
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    ## wsgi request helpers ###################################################
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    def application_uri(self):
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        """Return the application's base URI (no PATH_INFO or QUERY_STRING)
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        see python2.5's wsgiref.util.application_uri code
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        """
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        environ = self.environ
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        url = environ['wsgi.url_scheme'] + '://'
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        if environ.get('HTTP_HOST'):
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            url += environ['HTTP_HOST']
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        else:
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            url += environ['SERVER_NAME']
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            if environ['wsgi.url_scheme'] == 'https':
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                if environ['SERVER_PORT'] != '443':
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                    url += ':' + environ['SERVER_PORT']
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            else:
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                if environ['SERVER_PORT'] != '80':
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                    url += ':' + environ['SERVER_PORT']
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        url += quote(environ.get('SCRIPT_NAME') or '/')
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        return url
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    def get_full_path(self):
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        return '%s%s' % (self.path, self.environ.get('QUERY_STRING', '') and ('?' + self.environ.get('QUERY_STRING', '')) or '')
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    def is_secure(self):
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        return 'wsgi.url_scheme' in self.environ \
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            and self.environ['wsgi.url_scheme'] == 'https'
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    def get_posted_data(self):
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        files = None
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        if self.method == 'POST':
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            if self.environ.get('CONTENT_TYPE', '').startswith('multipart'):
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                header_dict = dict((normalize_header(k[5:]), v)
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                                   for k, v in self.environ.items()
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                                   if k.startswith('HTTP_'))
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                header_dict['Content-Type'] = self.environ.get('CONTENT_TYPE', '')
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                post, files = parse_file_upload(header_dict, self.raw_post_data)
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            else:
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                post = qs2dict(self.raw_post_data)
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        else:
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            # The WSGI spec says 'QUERY_STRING' may be absent.
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            post = qs2dict(self.environ.get('QUERY_STRING', ''))
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        return post, files
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    @property
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    @cached
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    def raw_post_data(self):
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        buf = StringIO()
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        try:
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            # CONTENT_LENGTH might be absent if POST doesn't have content at all (lighttpd)
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            content_length = int(self.environ.get('CONTENT_LENGTH', 0))
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        except ValueError: # if CONTENT_LENGTH was empty string or not an integer
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            content_length = 0
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        if content_length > 0:
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            safe_copyfileobj(self.environ['wsgi.input'], buf,
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                    size=content_length)
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        postdata = buf.getvalue()
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        buf.close()
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        return postdata
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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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        # XXX
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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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#         try:
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#             http.checkPreconditions(self._twreq, _PreResponse(self))
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#         except http.HTTPError, ex:
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#             self.info('valid http cache, no actual rendering')
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#             raise DirectResponse(ex.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')