wsgi/handler.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 01 Jul 2010 17:46:58 +0200
branchstable
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child 5442 3ed8afbbdf70
permissions -rw-r--r--
[migration] schema should be accessed through .repo
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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, debug=None, vreg=None):
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        self.appli = CubicWebPublisher(config, debug=debug, vreg=vreg)
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        self.debugmode = debug
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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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   128
        except Redirect, ex:
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   129
            return self.redirect(req, ex.location)
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        path = req.path
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   131
        if not path or path == "/":
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   132
            path = 'view'
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   133
        try:
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   134
            result = self.appli.publish(path, req)
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   135
        except DirectResponse, ex:
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   136
            return WSGIResponse(200, req, ex.response)
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   137
        except StatusResponse, ex:
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   138
            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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   139
        except AuthenticationError:  # must be before AuthenticationError
0
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   140
            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
   141
        except LogOut:
0
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   142
            if self.config['auth-mode'] == 'cookie':
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   143
                # in cookie mode redirecting to the index view is enough :
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   144
                # either anonymous connection is allowed and the page will
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   145
                # be displayed or we'll be redirected to the login form
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   146
                msg = req._('you have been logged out')
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   147
#                 if req.https:
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   148
#                     req._base_url =  self.base_url
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   149
#                     req.https = False
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   150
                url = req.build_url('view', vid='index', __message=msg)
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parents:
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   151
                return self.redirect(req, url)
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   152
            else:
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   153
                # in http we have to request auth to flush current http auth
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   154
                # information
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   155
                return self.request_auth(req, loggedout=True)
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parents:
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   156
        except Redirect, ex:
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parents:
diff changeset
   157
            return self.redirect(req, ex.location)
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parents:
diff changeset
   158
        if not result:
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parents:
diff changeset
   159
            # no result, something went wrong...
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parents:
diff changeset
   160
            self.error('no data (%s)', req)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   161
            # 500 Internal server error
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parents:
diff changeset
   162
            return self.redirect(req, req.build_url('error'))
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parents:
diff changeset
   163
        return WSGIResponse(200, req, result)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 0
diff changeset
   164
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 0
diff changeset
   165
0
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parents:
diff changeset
   166
    def __call__(self, environ, start_response):
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parents:
diff changeset
   167
        """WSGI protocol entry point"""
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parents:
diff changeset
   168
        req = CubicWebWsgiRequest(environ, self.appli.vreg, self.base_url)
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parents:
diff changeset
   169
        response = self._render(req)
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parents:
diff changeset
   170
        start_response(response.status, response.headers)
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parents:
diff changeset
   171
        return response.body
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parents:
diff changeset
   172
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   173
    def redirect(self, req, location):
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diff changeset
   174
        """convenience function which builds a redirect WSGIResponse"""
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parents:
diff changeset
   175
        self.debug('redirecting to %s', location)
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parents:
diff changeset
   176
        req.set_header('location', str(location))
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parents:
diff changeset
   177
        return WSGIResponse(303, req)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 0
diff changeset
   178
0
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parents:
diff changeset
   179
    def request_auth(self, req, loggedout=False):
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parents:
diff changeset
   180
        """returns the appropriate WSGIResponse to require the user to log in
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   181
        """
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parents:
diff changeset
   182
#         if self.https_url and req.base_url() != self.https_url:
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   183
#             return self.redirect(self.https_url + 'login')
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parents:
diff changeset
   184
        if self.config['auth-mode'] == 'http':
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parents:
diff changeset
   185
            code = 401 # UNAUTHORIZED
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parents:
diff changeset
   186
        else:
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parents:
diff changeset
   187
            code = 403 # FORBIDDEN
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parents:
diff changeset
   188
        if loggedout:
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parents:
diff changeset
   189
#             if req.https:
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parents:
diff changeset
   190
#                 req._base_url =  self.base_url
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parents:
diff changeset
   191
#                 req.https = False
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parents:
diff changeset
   192
            content = self.appli.loggedout_content(req)
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parents:
diff changeset
   193
        else:
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parents:
diff changeset
   194
            content = self.appli.need_login_content(req)
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parents:
diff changeset
   195
        return WSGIResponse(code, req, content)
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parents:
diff changeset
   196
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parents:
diff changeset
   197
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parents:
diff changeset
   198
from logging import getLogger
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parents:
diff changeset
   199
from cubicweb import set_log_methods
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parents:
diff changeset
   200
set_log_methods(CubicWebWSGIApplication, getLogger('cubicweb.wsgi'))