wsgi/handler.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Tue, 10 Mar 2009 09:39:23 +0100
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"""WSGI request handler for cubicweb
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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 cubicweb import ObjectNotFound, AuthenticationError
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from cubicweb.web import (NotFound, Redirect, DirectResponse, StatusResponse,
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                       ExplicitLogin)
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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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        try:
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            self.url_rewriter = self.appli.vreg.select_component('urlrewriter')
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        except ObjectNotFound:
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            self.url_rewriter = None
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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 AuthenticationError:
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            return self.request_auth(req)
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        except Redirect, ex:
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            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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            path = 'view'
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        try:
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            result = self.appli.publish(path, req)
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        except DirectResponse, ex:
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            return WSGIResponse(200, req, ex.response)
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        except StatusResponse, ex:
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            return WSGIResponse(ex.status, req, ex.content)
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        except NotFound:
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            result = self.appli.notfound_content(req)
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            return WSGIResponse(404, req, result)
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        except ExplicitLogin:  # must be before AuthenticationError
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            return self.request_auth(req)
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        except AuthenticationError:
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            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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                # be displayed or we'll be redirected to the login form
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                msg = req._('you have been logged out')
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#                 if req.https:
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#                     req._base_url =  self.base_url
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#                     req.https = False
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                url = req.build_url('view', vid='index', __message=msg)
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                return self.redirect(req, url)
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            else:
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                # in http we have to request auth to flush current http auth
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                # information
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                return self.request_auth(req, loggedout=True)
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        except Redirect, ex:
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            return self.redirect(req, ex.location)
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        if not result:
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            # no result, something went wrong...
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            self.error('no data (%s)', req)
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            # 500 Internal server error
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            return self.redirect(req, req.build_url('error'))
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        return WSGIResponse(200, req, result)
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    def __call__(self, environ, start_response):
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        """WSGI protocol entry point"""
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        req = CubicWebWsgiRequest(environ, self.appli.vreg, self.base_url)
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        response = self._render(req)
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        start_response(response.status, response.headers)
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        return response.body
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    def redirect(self, req, location):
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        """convenience function which builds a redirect WSGIResponse"""
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        self.debug('redirecting to %s', location)
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        req.set_header('location', str(location))
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        return WSGIResponse(303, req)
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    def request_auth(self, req, loggedout=False):
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        """returns the appropriate WSGIResponse to require the user to log in
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        """
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#         if self.https_url and req.base_url() != self.https_url:
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#             return self.redirect(self.https_url + 'login')
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        if self.config['auth-mode'] == 'http':
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            code = 401 # UNAUTHORIZED
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        else:
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            code = 403 # FORBIDDEN
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        if loggedout:
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#             if req.https:
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#                 req._base_url =  self.base_url
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#                 req.https = False
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            content = self.appli.loggedout_content(req)
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        else:
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            content = self.appli.need_login_content(req)
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        return WSGIResponse(code, req, content)
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from logging import getLogger
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from cubicweb import set_log_methods
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set_log_methods(CubicWebWSGIApplication, getLogger('cubicweb.wsgi'))