+
−# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+
−# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+
−#
+
−# This file is part of CubicWeb.
+
−#
+
−# CubicWeb is free software: you can redistribute it and/or modify it under the
+
−# terms of the GNU Lesser General Public License as published by the Free
+
−# Software Foundation, either version 2.1 of the License, or (at your option)
+
−# any later version.
+
−#
+
−# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
+
−# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+
−# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+
−# details.
+
−#
+
−# You should have received a copy of the GNU Lesser General Public License along
+
−# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
+
−"""abstract controller classe for CubicWeb web client
+
−
+
−
+
−"""
+
−__docformat__ = "restructuredtext en"
+
−
+
−from logilab.mtconverter import xml_escape
+
−
+
−from cubicweb.selectors import yes
+
−from cubicweb.appobject import AppObject
+
−from cubicweb.web import LOGGER, Redirect, RequestError
+
−
+
−
+
−NAVIGATION_PARAMETERS = (('vid', '__redirectvid'),
+
−                         ('rql', '__redirectrql'),
+
−                         ('__redirectpath', '__redirectpath'),
+
−                         ('__redirectparams', '__redirectparams'),
+
−                         )
+
−NAV_FORM_PARAMETERS = tuple(fp for ap, fp in NAVIGATION_PARAMETERS)
+
−
+
−def redirect_params(form):
+
−    """transform redirection parameters into navigation parameters
+
−    """
+
−    params = {}
+
−    # extract navigation parameters from redirection parameters
+
−    for navparam, redirectparam in NAVIGATION_PARAMETERS:
+
−        if navparam == redirectparam:
+
−            continue
+
−        if redirectparam in form:
+
−            params[navparam] = form[redirectparam]
+
−    return params
+
−
+
−def append_url_params(url, params):
+
−    """append raw parameters to the url. Given parameters, if any, are expected
+
−    to be already url-quoted.
+
−    """
+
−    if params:
+
−        if not '?' in url:
+
−            url += '?'
+
−        else:
+
−            url += '&'
+
−        url += params
+
−    return url
+
−
+
−
+
−class Controller(AppObject):
+
−    """a controller is responsible to make necessary stuff to publish
+
−    a request. There is usually at least one standard "view" controller
+
−    and another linked by forms to edit objects ("edit").
+
−    """
+
−    __registry__ = 'controllers'
+
−    __select__ = yes()
+
−
+
−    def __init__(self, *args, **kwargs):
+
−        self.appli = kwargs.pop('appli', None)
+
−        super(Controller, self).__init__(*args, **kwargs)
+
−        # attributes use to control after edition redirection
+
−        self._after_deletion_path = None
+
−        self._edited_entity = None
+
−
+
−    def publish(self, rset=None):
+
−        """publish the current request, with an optional input rset"""
+
−        raise NotImplementedError
+
−
+
−    # generic methods useful for concrete implementations ######################
+
−
+
−    def process_rql(self, rql):
+
−        """execute rql if specified"""
+
−        # XXX assigning to self really necessary?
+
−        self.cw_rset = None
+
−        if rql:
+
−            self._cw.ensure_ro_rql(rql)
+
−            if not isinstance(rql, unicode):
+
−                rql = unicode(rql, self._cw.encoding)
+
−            pp = self._cw.vreg['components'].select_or_none('magicsearch', self._cw)
+
−            if pp is not None:
+
−                self.cw_rset = pp.process_query(rql)
+
−        return self.cw_rset
+
−
+
−    def notify_edited(self, entity):
+
−        """called by edit_entity() to notify which entity is edited"""
+
−        # NOTE: we can't use entity.rest_path() at this point because
+
−        #       rest_path() could rely on schema constraints (such as a required
+
−        #       relation) that might not be satisfied yet (in case of creations)
+
−        if not self._edited_entity:
+
−            self._edited_entity = entity
+
−
+
−    def validate_cache(self, view):
+
−        view.set_http_cache_headers()
+
−        self._cw.validate_cache()
+
−
+
−    def reset(self):
+
−        """reset form parameters and redirect to a view determinated by given
+
−        parameters
+
−        """
+
−        newparams = {}
+
−        # sets message if needed
+
−        if self._cw.message:
+
−            newparams['_cwmsgid'] = self._cw.set_redirect_message(self._cw.message)
+
−        if self._cw.form.has_key('__action_apply'):
+
−            self._return_to_edition_view(newparams)
+
−        if self._cw.form.has_key('__action_cancel'):
+
−            self._return_to_lastpage(newparams)
+
−        else:
+
−            self._return_to_original_view(newparams)
+
−
+
−    def _return_to_original_view(self, newparams):
+
−        """validate-button case"""
+
−        # transforms __redirect[*] parameters into regular form parameters
+
−        newparams.update(redirect_params(self._cw.form))
+
−        # find out if we have some explicit `rql` needs
+
−        rql = newparams.pop('rql', None)
+
−        # if rql is needed (explicit __redirectrql or multiple deletions for
+
−        # instance), we have to use the old `view?rql=...` form
+
−        if rql:
+
−            path = 'view'
+
−            newparams['rql'] = rql
+
−        elif '__redirectpath' in self._cw.form:
+
−            # if redirect path was explicitly specified in the form, use it
+
−            path = self._cw.form['__redirectpath']
+
−            if (self._edited_entity and path != self._edited_entity.rest_path()
+
−                and '_cwmsgid' in newparams):
+
−                # XXX may be here on modification?
+
−                msg = u'(<a href="%s">%s</a>)' % (
+
−                    xml_escape(self._edited_entity.absolute_url()),
+
−                    self._cw._('click here to see created entity'))
+
−                self._cw.append_to_redirect_message(msg)
+
−        elif self._after_deletion_path:
+
−            # else it should have been set during form processing
+
−            path, params = self._after_deletion_path
+
−            params = dict(params) # params given as tuple
+
−            params.update(newparams)
+
−            newparams = params
+
−        elif self._edited_entity:
+
−            # clear caches in case some attribute participating to the rest path
+
−            # has been modified
+
−            self._edited_entity.clear_all_caches()
+
−            path = self._edited_entity.rest_path()
+
−        else:
+
−            path = 'view'
+
−        url = self._cw.build_url(path, **newparams)
+
−        url = append_url_params(url, self._cw.form.get('__redirectparams'))
+
−        raise Redirect(url)
+
−
+
−    def _return_to_edition_view(self, newparams):
+
−        """apply-button case"""
+
−        form = self._cw.form
+
−        if self._edited_entity:
+
−            path = self._edited_entity.rest_path()
+
−            newparams.pop('rql', None)
+
−        # else, fallback on the old `view?rql=...` url form
+
−        elif 'rql' in self._cw.form:
+
−            path = 'view'
+
−            newparams['rql'] = form['rql']
+
−        else:
+
−            self.warning('the edited data seems inconsistent')
+
−            path = 'view'
+
−        # pick up the correction edition view
+
−        if form.get('__form_id'):
+
−            newparams['vid'] = form['__form_id']
+
−        # re-insert copy redirection parameters
+
−        for redirectparam in NAV_FORM_PARAMETERS:
+
−            if redirectparam in form:
+
−                newparams[redirectparam] = form[redirectparam]
+
−        raise Redirect(self._cw.build_url(path, **newparams))
+
−
+
−
+
−    def _return_to_lastpage(self, newparams):
+
−        """cancel-button case: in this case we are always expecting to go back
+
−        where we came from, and this is not easy. Currently we suppose that
+
−        __redirectpath is specifying that place if found, else we look in the
+
−        request breadcrumbs for the last visited page.
+
−        """
+
−        if '__redirectpath' in self._cw.form:
+
−            # if redirect path was explicitly specified in the form, use it
+
−            path = self._cw.form['__redirectpath']
+
−            url = self._cw.build_url(path, **newparams)
+
−            url = append_url_params(url, self._cw.form.get('__redirectparams'))
+
−        else:
+
−            url = self._cw.last_visited_page()
+
−        raise Redirect(url)
+
−
+
−
+
−from cubicweb import set_log_methods
+
−set_log_methods(Controller, LOGGER)
+
−