wsgi/handler.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 17 Feb 2011 16:09:06 +0100
changeset 7006 d0f635d3a6bb
parent 5442 3ed8afbbdf70
child 7083 b8e35cde46e9
permissions -rw-r--r--
backport stable
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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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"""WSGI request handler for cubicweb
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"""
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__docformat__ = "restructuredtext en"
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from cubicweb import AuthenticationError
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from cubicweb.web import Redirect, DirectResponse, StatusResponse, LogOut
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from cubicweb.web.application import CubicWebPublisher
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from cubicweb.wsgi.request import CubicWebWsgiRequest
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# See http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
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STATUS_CODE_TEXT = {
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    100: 'CONTINUE',
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    101: 'SWITCHING PROTOCOLS',
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    200: 'OK',
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    201: 'CREATED',
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    202: 'ACCEPTED',
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    203: 'NON-AUTHORITATIVE INFORMATION',
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    204: 'NO CONTENT',
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    205: 'RESET CONTENT',
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    206: 'PARTIAL CONTENT',
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    300: 'MULTIPLE CHOICES',
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    301: 'MOVED PERMANENTLY',
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    302: 'FOUND',
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    303: 'SEE OTHER',
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    304: 'NOT MODIFIED',
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    305: 'USE PROXY',
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    306: 'RESERVED',
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    307: 'TEMPORARY REDIRECT',
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    400: 'BAD REQUEST',
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    401: 'UNAUTHORIZED',
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    402: 'PAYMENT REQUIRED',
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    403: 'FORBIDDEN',
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    404: 'NOT FOUND',
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    405: 'METHOD NOT ALLOWED',
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    406: 'NOT ACCEPTABLE',
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    407: 'PROXY AUTHENTICATION REQUIRED',
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    408: 'REQUEST TIMEOUT',
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    409: 'CONFLICT',
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    410: 'GONE',
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    411: 'LENGTH REQUIRED',
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    412: 'PRECONDITION FAILED',
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    413: 'REQUEST ENTITY TOO LARGE',
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    414: 'REQUEST-URI TOO LONG',
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    415: 'UNSUPPORTED MEDIA TYPE',
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    416: 'REQUESTED RANGE NOT SATISFIABLE',
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    417: 'EXPECTATION FAILED',
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    500: 'INTERNAL SERVER ERROR',
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    501: 'NOT IMPLEMENTED',
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    502: 'BAD GATEWAY',
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    503: 'SERVICE UNAVAILABLE',
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    504: 'GATEWAY TIMEOUT',
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    505: 'HTTP VERSION NOT SUPPORTED',
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}
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class WSGIResponse(object):
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    """encapsulates the wsgi response parameters
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    (code, headers and body if there is one)
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    """
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    def __init__(self, code, req, body=None):
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        text = STATUS_CODE_TEXT.get(code, 'UNKNOWN STATUS CODE')
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        self.status =  '%s %s' % (code, text)
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        self.headers = [(str(k), str(v)) for k, v in req.headers_out.items()]
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        if body:
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            self.body = [body]
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        else:
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            self.body = []
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    def __iter__(self):
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        return iter(self.body)
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class CubicWebWSGIApplication(object):
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    """This is the wsgi application which will be called by the
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    wsgi server with the WSGI ``environ`` and ``start_response``
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    parameters.
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    XXX: missing looping tasks and proper repository shutdown when
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    the application is stopped.
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    NOTE: no pyro
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    """
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    def __init__(self, config, vreg=None):
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        self.appli = CubicWebPublisher(config, vreg=vreg)
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        self.config = config
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        self.base_url = None
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#         self.base_url = config['base-url'] or config.default_base_url()
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#         assert self.base_url[-1] == '/'
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#         self.https_url = config['https-url']
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#         assert not self.https_url or self.https_url[-1] == '/'
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        self.url_rewriter = self.appli.vreg['components'].select_or_none('urlrewriter')
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0
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    def _render(self, req):
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        """this function performs the actual rendering
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        XXX missing: https handling, url rewriting, cache management,
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                     authentication
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        """
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        if self.base_url is None:
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            self.base_url = self.config._base_url = req.base_url()
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        # XXX https handling needs to be implemented
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        if req.authmode == 'http':
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            # activate realm-based auth
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            realm = self.config['realm']
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            req.set_header('WWW-Authenticate', [('Basic', {'realm' : realm })], raw=False)
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        try:
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            self.appli.connect(req)
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        except Redirect, ex:
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   128
            return self.redirect(req, ex.location)
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        path = req.path
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        if not path or path == "/":
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   131
            path = 'view'
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        try:
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            result = self.appli.publish(path, req)
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   134
        except DirectResponse, ex:
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   135
            return WSGIResponse(200, req, ex.response)
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   136
        except StatusResponse, ex:
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   137
            return WSGIResponse(ex.status, req, ex.content)
5223
6abd6e3599f4 #773448: refactor session and 'no connection' handling, by introducing proper web session. We should now be able to see page even when no anon is configured, and be redirected to the login form as soon as one tries to do a query.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
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   138
        except AuthenticationError:  # must be before AuthenticationError
0
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   139
            return self.request_auth(req)
5223
6abd6e3599f4 #773448: refactor session and 'no connection' handling, by introducing proper web session. We should now be able to see page even when no anon is configured, and be redirected to the login form as soon as one tries to do a query.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4721
diff changeset
   140
        except LogOut:
0
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   141
            if self.config['auth-mode'] == 'cookie':
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                # in cookie mode redirecting to the index view is enough :
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                # either anonymous connection is allowed and the page will
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   144
                # be displayed or we'll be redirected to the login form
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   145
                msg = req._('you have been logged out')
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   146
#                 if req.https:
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   147
#                     req._base_url =  self.base_url
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   148
#                     req.https = False
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   149
                url = req.build_url('view', vid='index', __message=msg)
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   150
                return self.redirect(req, url)
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   151
            else:
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   152
                # in http we have to request auth to flush current http auth
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   153
                # information
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   154
                return self.request_auth(req, loggedout=True)
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   155
        except Redirect, ex:
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parents:
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   156
            return self.redirect(req, ex.location)
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parents:
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   157
        if not result:
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parents:
diff changeset
   158
            # no result, something went wrong...
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parents:
diff changeset
   159
            self.error('no data (%s)', req)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   160
            # 500 Internal server error
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parents:
diff changeset
   161
            return self.redirect(req, req.build_url('error'))
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parents:
diff changeset
   162
        return WSGIResponse(200, req, result)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 0
diff changeset
   163
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 0
diff changeset
   164
0
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parents:
diff changeset
   165
    def __call__(self, environ, start_response):
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parents:
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   166
        """WSGI protocol entry point"""
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parents:
diff changeset
   167
        req = CubicWebWsgiRequest(environ, self.appli.vreg, self.base_url)
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parents:
diff changeset
   168
        response = self._render(req)
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parents:
diff changeset
   169
        start_response(response.status, response.headers)
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parents:
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   170
        return response.body
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parents:
diff changeset
   171
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   172
    def redirect(self, req, location):
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diff changeset
   173
        """convenience function which builds a redirect WSGIResponse"""
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diff changeset
   174
        self.debug('redirecting to %s', location)
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parents:
diff changeset
   175
        req.set_header('location', str(location))
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parents:
diff changeset
   176
        return WSGIResponse(303, req)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 0
diff changeset
   177
0
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parents:
diff changeset
   178
    def request_auth(self, req, loggedout=False):
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parents:
diff changeset
   179
        """returns the appropriate WSGIResponse to require the user to log in
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parents:
diff changeset
   180
        """
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parents:
diff changeset
   181
#         if self.https_url and req.base_url() != self.https_url:
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parents:
diff changeset
   182
#             return self.redirect(self.https_url + 'login')
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parents:
diff changeset
   183
        if self.config['auth-mode'] == 'http':
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parents:
diff changeset
   184
            code = 401 # UNAUTHORIZED
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diff changeset
   185
        else:
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parents:
diff changeset
   186
            code = 403 # FORBIDDEN
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parents:
diff changeset
   187
        if loggedout:
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diff changeset
   188
#             if req.https:
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diff changeset
   189
#                 req._base_url =  self.base_url
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diff changeset
   190
#                 req.https = False
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parents:
diff changeset
   191
            content = self.appli.loggedout_content(req)
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parents:
diff changeset
   192
        else:
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parents:
diff changeset
   193
            content = self.appli.need_login_content(req)
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parents:
diff changeset
   194
        return WSGIResponse(code, req, content)
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parents:
diff changeset
   195
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parents:
diff changeset
   196
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parents:
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   197
from logging import getLogger
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parents:
diff changeset
   198
from cubicweb import set_log_methods
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parents:
diff changeset
   199
set_log_methods(CubicWebWSGIApplication, getLogger('cubicweb.wsgi'))