author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Fri, 22 Jan 2010 08:49:16 +0100 | |
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"""abstract controler classe for CubicWeb web client |
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:organization: Logilab |
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update copyright: welcome 2010
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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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import datetime |
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from cubicweb import typed_eid |
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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 option input rql string |
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(already processed if necessary) |
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""" |
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raise NotImplementedError |
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# generic methods useful for concret 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 check_expected_params(self, params): |
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"""check that the given list of parameters are specified in the form |
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dictionary |
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""" |
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missing = [] |
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for param in params: |
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if not self._cw.form.get(param): |
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missing.append(param) |
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if missing: |
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raise RequestError('missing required parameter(s): %s' |
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% ','.join(missing)) |
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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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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 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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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)) |
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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: |
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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() |
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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')) |
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raise Redirect(url) |
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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 |
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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: |
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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)) |
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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: |
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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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