web/controller.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 12 Mar 2010 10:49:42 +0100
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"""abstract controller classe for CubicWeb web client
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from cubicweb.selectors import yes
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from cubicweb.appobject import AppObject
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from cubicweb.web import LOGGER, Redirect, RequestError
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NAVIGATION_PARAMETERS = (('vid', '__redirectvid'),
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                         ('rql', '__redirectrql'),
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                         ('__redirectpath', '__redirectpath'),
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                         ('__redirectparams', '__redirectparams'),
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                         )
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NAV_FORM_PARAMETERS = tuple(fp for ap, fp in NAVIGATION_PARAMETERS)
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def redirect_params(form):
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    """transform redirection parameters into navigation parameters
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    """
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    params = {}
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    # extract navigation parameters from redirection parameters
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    for navparam, redirectparam in NAVIGATION_PARAMETERS:
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        if navparam == redirectparam:
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            continue
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        if redirectparam in form:
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            params[navparam] = form[redirectparam]
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    return params
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def append_url_params(url, params):
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    """append raw parameters to the url. Given parameters, if any, are expected
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    to be already url-quoted.
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    """
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    if params:
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        if not '?' in url:
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            url += '?'
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        else:
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            url += '&'
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        url += params
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    return url
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class Controller(AppObject):
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    """a controller is responsible to make necessary stuff to publish
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    a request. There is usually at least one standard "view" controller
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    and another linked by forms to edit objects ("edit").
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    """
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    __registry__ = 'controllers'
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    __select__ = yes()
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    def __init__(self, *args, **kwargs):
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        self.appli = kwargs.pop('appli', None)
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        super(Controller, self).__init__(*args, **kwargs)
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        # attributes use to control after edition redirection
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        self._after_deletion_path = None
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        self._edited_entity = None
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    def publish(self, rset=None):
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        """publish the current request, with an optional input rset"""
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        raise NotImplementedError
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    # generic methods useful for concrete implementations ######################
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    def process_rql(self, rql):
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        """execute rql if specified"""
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        # XXX assigning to self really necessary?
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        self.cw_rset = None
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        if rql:
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            self._cw.ensure_ro_rql(rql)
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            if not isinstance(rql, unicode):
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                rql = unicode(rql, self._cw.encoding)
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            pp = self._cw.vreg['components'].select_or_none('magicsearch', self._cw)
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            if pp is not None:
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                self.cw_rset = pp.process_query(rql)
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        return self.cw_rset
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    def notify_edited(self, entity):
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        """called by edit_entity() to notify which entity is edited"""
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        # NOTE: we can't use entity.rest_path() at this point because
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        #       rest_path() could rely on schema constraints (such as a required
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        #       relation) that might not be satisfied yet (in case of creations)
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        if not self._edited_entity:
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            self._edited_entity = entity
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    # XXX move to EditController (only customer)
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    def delete_entities(self, eidtypes):
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        """delete entities from the repository"""
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        redirect_info = set()
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        eidtypes = tuple(eidtypes)
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        for eid, etype in eidtypes:
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            entity = self._cw.entity_from_eid(eid, etype)
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            path, params = entity.after_deletion_path()
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            redirect_info.add( (path, tuple(params.iteritems())) )
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            entity.delete()
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        if len(redirect_info) > 1:
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            # In the face of ambiguity, refuse the temptation to guess.
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            self._after_deletion_path = 'view', ()
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        else:
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            self._after_deletion_path = iter(redirect_info).next()
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        if len(eidtypes) > 1:
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            self._cw.set_message(self._cw._('entities deleted'))
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        else:
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            self._cw.set_message(self._cw._('entity deleted'))
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    def validate_cache(self, view):
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        view.set_http_cache_headers()
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        self._cw.validate_cache()
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    # XXX is that used AT ALL ?
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    def reset(self):
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        """reset form parameters and redirect to a view determinated by given
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        parameters
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        """
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        newparams = {}
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        # sets message if needed
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        if self._cw.message:
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            newparams['__message'] = self._cw.message
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        if self._cw.form.has_key('__action_apply'):
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            self._return_to_edition_view(newparams)
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        if self._cw.form.has_key('__action_cancel'):
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            self._return_to_lastpage(newparams)
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        else:
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            self._return_to_original_view(newparams)
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    # XXX is that used AT ALL ?
0
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    def _return_to_original_view(self, newparams):
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        """validate-button case"""
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        # transforms __redirect[*] parameters into regular form parameters
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        newparams.update(redirect_params(self._cw.form))
0
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        # find out if we have some explicit `rql` needs
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        rql = newparams.pop('rql', None)
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        # if rql is needed (explicit __redirectrql or multiple deletions for
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        # instance), we have to use the old `view?rql=...` form
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        if rql:
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            path = 'view'
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            newparams['rql'] = rql
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        elif '__redirectpath' in self._cw.form:
0
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            # if redirect path was explicitly specified in the form, use it
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            path = self._cw.form['__redirectpath']
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            if self._edited_entity and path != self._edited_entity.rest_path():
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                # XXX may be here on modification? if yes the message should be
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                # modified where __createdpath is detected (cw.web.request)
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                newparams['__createdpath'] = self._edited_entity.rest_path()
0
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        elif self._after_deletion_path:
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            # else it should have been set during form processing
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            path, params = self._after_deletion_path
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            params = dict(params) # params given as tuple
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            params.update(newparams)
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            newparams = params
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        elif self._edited_entity:
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            path = self._edited_entity.rest_path()
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        else:
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            path = 'view'
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        url = self._cw.build_url(path, **newparams)
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        url = append_url_params(url, self._cw.form.get('__redirectparams'))
0
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        raise Redirect(url)
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    # XXX is that used AT ALL ?
0
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    def _return_to_edition_view(self, newparams):
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        """apply-button case"""
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        form = self._cw.form
0
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        if self._edited_entity:
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            path = self._edited_entity.rest_path()
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            newparams.pop('rql', None)
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        # else, fallback on the old `view?rql=...` url form
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        elif 'rql' in self._cw.form:
0
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            path = 'view'
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            newparams['rql'] = form['rql']
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        else:
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            self.warning("the edited data seems inconsistent")
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            path = 'view'
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        # pick up the correction edition view
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        if form.get('__form_id'):
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            newparams['vid'] = form['__form_id']
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        # re-insert copy redirection parameters
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        for redirectparam in NAV_FORM_PARAMETERS:
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            if redirectparam in form:
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                newparams[redirectparam] = form[redirectparam]
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        raise Redirect(self._cw.build_url(path, **newparams))
0
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    # XXX is that used AT ALL ?
0
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    def _return_to_lastpage(self, newparams):
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        """cancel-button case: in this case we are always expecting to go back
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        where we came from, and this is not easy. Currently we suppose that
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        __redirectpath is specifying that place if found, else we look in the
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        request breadcrumbs for the last visited page.
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        """
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        if '__redirectpath' in self._cw.form:
0
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            # if redirect path was explicitly specified in the form, use it
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            path = self._cw.form['__redirectpath']
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            url = self._cw.build_url(path, **newparams)
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            url = append_url_params(url, self._cw.form.get('__redirectparams'))
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        else:
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            url = self._cw.last_visited_page()
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        raise Redirect(url)
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from cubicweb import set_log_methods
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set_log_methods(Controller, LOGGER)
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