sobjects/notification.py
author Pierre-Yves David <pierre-yves.david@logilab.fr>
Fri, 03 May 2013 16:27:34 +0200
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[pkg/debian] prepare release 3.17.0-2
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# copyright 2003-2012 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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"""some views to handle notification on data changes"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from itertools import repeat
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from logilab.common.textutils import normalize_text
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from logilab.common.deprecation import class_renamed, class_moved, deprecated
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from logilab.common.registry import yes
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from cubicweb.entity import Entity
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from cubicweb.view import Component, EntityView
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from cubicweb.server.hook import SendMailOp
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from cubicweb.mail import construct_message_id, format_mail
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from cubicweb.server.session import Session
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class RecipientsFinder(Component):
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    """this component is responsible to find recipients of a notification
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    by default user's with their email set are notified if any, else the default
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    email addresses specified in the configuration are used
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    """
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    __regid__ = 'recipients_finder'
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    __select__ = yes()
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    user_rql = ('Any X,E,A WHERE X is CWUser, X in_state S, S name "activated",'
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                'X primary_email E, E address A')
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    def recipients(self):
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        mode = self._cw.vreg.config['default-recipients-mode']
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        if mode == 'users':
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            execute = self._cw.execute
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            dests = [(u.cw_adapt_to('IEmailable').get_email(),
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                      u.property_value('ui.language'))
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                     for u in execute(self.user_rql, build_descr=True).entities()]
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        elif mode == 'default-dest-addrs':
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            lang = self._cw.vreg.property_value('ui.language')
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            dests = zip(self._cw.vreg.config['default-dest-addrs'], repeat(lang))
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        else: # mode == 'none'
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            dests = []
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        return dests
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# abstract or deactivated notification views and mixin ########################
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class SkipEmail(Exception):
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    """raise this if you decide to skip an email during its generation"""
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class NotificationView(EntityView):
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    """abstract view implementing the "email" API (eg to simplify sending
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    notification)
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    """
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    # XXX refactor this class to work with len(rset) > 1
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    msgid_timestamp = True
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    # to be defined on concrete sub-classes
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    content = None # body of the mail
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    message = None # action verb of the subject
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    # this is usually the method to call
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    def render_and_send(self, **kwargs):
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        """generate and send an email message for this view"""
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        delayed = kwargs.pop('delay_to_commit', None)
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        for recipients, msg in self.render_emails(**kwargs):
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            if delayed is None:
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                self.send(recipients, msg)
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            elif delayed:
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                self.send_on_commit(recipients, msg)
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            else:
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                self.send_now(recipients, msg)
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    def cell_call(self, row, col=0, **kwargs):
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        self.w(self._cw._(self.content) % self.context(**kwargs))
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    def render_emails(self, **kwargs):
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        """generate and send emails for this view (one per recipient)"""
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        self._kwargs = kwargs
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        recipients = self.recipients()
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        if not recipients:
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            self.info('skipping %s notification, no recipients', self.__regid__)
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            return
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        if self.cw_rset is not None:
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            entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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            # if the view is using timestamp in message ids, no way to reference
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            # previous email
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            if not self.msgid_timestamp:
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                refs = [self.construct_message_id(eid)
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                        for eid in entity.cw_adapt_to('INotifiable').notification_references(self)]
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            else:
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                refs = ()
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            msgid = self.construct_message_id(entity.eid)
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        else:
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            refs = ()
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            msgid = None
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        req = self._cw
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        self.user_data = req.user_data()
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        origlang = req.lang
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        for something in recipients:
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            if isinstance(something, Entity):
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                # hi-jack self._cw to get a session for the returned user
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                self._cw = Session(self._cw.repo, something)
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                emailaddr = something.cw_adapt_to('IEmailable').get_email()
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            else:
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                emailaddr, lang = something
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                self._cw.set_language(lang)
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            # since the same view (eg self) may be called multiple time and we
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            # need a fresh stream at each iteration, reset it explicitly
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            self.w = None
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            # XXX call render before subject to set .row/.col attributes on the
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            #     view
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            try:
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                content = self.render(row=0, col=0, **kwargs)
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                subject = self.subject()
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            except SkipEmail:
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                continue
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            except Exception as ex:
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                # shouldn't make the whole transaction fail because of rendering
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                # error (unauthorized or such) XXX check it doesn't actually
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                # occurs due to rollback on such error
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                self.exception(str(ex))
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                continue
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            msg = format_mail(self.user_data, [emailaddr], content, subject,
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                              config=self._cw.vreg.config, msgid=msgid, references=refs)
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            yield [emailaddr], msg
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        # restore language
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        req.set_language(origlang)
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    # recipients / email sending ###############################################
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    def recipients(self):
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        """return a list of either 2-uple (email, language) or user entity to
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        who this email should be sent
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        """
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        finder = self._cw.vreg['components'].select(
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            'recipients_finder', self._cw, rset=self.cw_rset,
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            row=self.cw_row or 0, col=self.cw_col or 0)
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        return finder.recipients()
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   160
    def send_now(self, recipients, msg):
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        self._cw.vreg.config.sendmails([(msg, recipients)])
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    def send_on_commit(self, recipients, msg):
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        SendMailOp(self._cw, recipients=recipients, msg=msg)
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    send = send_on_commit
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    # email generation helpers #################################################
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    def construct_message_id(self, eid):
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        return construct_message_id(self._cw.vreg.config.appid, eid,
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                                    self.msgid_timestamp)
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    def format_field(self, attr, value):
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        return ':%(attr)s: %(value)s' % {'attr': attr, 'value': value}
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    def format_section(self, attr, value):
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        return '%(attr)s\n%(ul)s\n%(value)s\n' % {
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            'attr': attr, 'ul': '-'*len(attr), 'value': value}
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   180
    def subject(self):
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        subject = self._cw._(self.message)
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        etype = entity.dc_type()
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        eid = entity.eid
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        login = self.user_data['login']
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        return self._cw._('%(subject)s %(etype)s #%(eid)s (%(login)s)') % locals()
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    def context(self, **kwargs):
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        for key, val in kwargs.iteritems():
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            if val and isinstance(val, unicode) and val.strip():
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               kwargs[key] = self._cw._(val)
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        kwargs.update({'user': self.user_data['login'],
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                       'eid': entity.eid,
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                       'etype': entity.dc_type(),
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                       'url': entity.absolute_url(),
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                       'title': entity.dc_long_title(),})
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        return kwargs
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0
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class StatusChangeMixIn(object):
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    __regid__ = 'notif_status_change'
0
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    msgid_timestamp = True
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    message = _('status changed')
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    content = _("""
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%(user)s changed status from <%(previous_state)s> to <%(current_state)s> for entity
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'%(title)s'
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%(comment)s
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url: %(url)s
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""")
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738
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###############################################################################
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# Actual notification views.                                                  #
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#                                                                             #
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# disable them at the recipients_finder level if you don't want them          #
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###############################################################################
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# XXX should be based on dc_title/dc_description, no?
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class ContentAddedView(NotificationView):
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    """abstract class for notification on entity/relation
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    all you have to do by default is :
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    * set id and __select__ attributes to match desired events and entity types
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    * set a content attribute to define the content of the email (unless you
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      override call)
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    """
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    __abstract__ = True
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    __regid__ = 'notif_after_add_entity'
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    msgid_timestamp = False
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    message = _('new')
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    content = """
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%(title)s
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%(content)s
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url: %(url)s
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"""
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    # to be defined on concrete sub-classes
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    content_attr = None
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    def context(self, **kwargs):
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        content = entity.printable_value(self.content_attr, format='text/plain')
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        if content:
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            contentformat = getattr(entity, self.content_attr + '_format',
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                                    'text/rest')
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            # XXX don't try to wrap rest until we've a proper transformation (see
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            # #103822)
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            if contentformat != 'text/rest':
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                content = normalize_text(content, 80)
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        return super(ContentAddedView, self).context(content=content, **kwargs)
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0
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    def subject(self):
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        return  u'%s #%s (%s)' % (self._cw.__('New %s' % entity.e_schema),
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                                  entity.eid, self.user_data['login'])
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def format_value(value):
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    if isinstance(value, unicode):
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        return u'"%s"' % value
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    return value
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class EntityUpdatedNotificationView(NotificationView):
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    """abstract class for notification on entity/relation
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    all you have to do by default is :
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    * set id and __select__ attributes to match desired events and entity types
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    * set a content attribute to define the content of the email (unless you
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      override call)
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    """
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    __abstract__ = True
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    __regid__ = 'notif_entity_updated'
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    msgid_timestamp = False
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    message = _('updated')
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    no_detailed_change_attrs = ()
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    content = """
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Properties have been updated by %(user)s:
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%(changes)s
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url: %(url)s
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"""
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    def context(self, **kwargs):
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        context = super(EntityUpdatedNotificationView, self).context(**kwargs)
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        changes = self._cw.transaction_data['changes'][self.cw_rset[0][0]]
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        _ = self._cw._
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        formatted_changes = []
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        for attr, oldvalue, newvalue in sorted(changes):
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            # check current user has permission to see the attribute
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            rschema = self._cw.vreg.schema[attr]
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            if rschema.final:
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                rdef = entity.e_schema.rdef(rschema)
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                if not rdef.has_perm(self._cw, 'read', eid=self.cw_rset[0][0]):
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                    continue
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            # XXX suppose it's a subject relation...
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            elif not rschema.has_perm(self._cw, 'read',
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                                      fromeid=self.cw_rset[0][0]):
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                continue
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            if attr in self.no_detailed_change_attrs:
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                msg = _('%s updated') % _(attr)
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            elif oldvalue not in (None, ''):
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                msg = _('%(attr)s updated from %(oldvalue)s to %(newvalue)s') % {
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                    'attr': _(attr),
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                    'oldvalue': format_value(oldvalue),
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                    'newvalue': format_value(newvalue)}
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            else:
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                msg = _('%(attr)s set to %(newvalue)s') % {
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                    'attr': _(attr), 'newvalue': format_value(newvalue)}
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            formatted_changes.append('* ' + msg)
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        if not formatted_changes:
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            # current user isn't allowed to see changes, skip this notification
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            raise SkipEmail()
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        context['changes'] = '\n'.join(formatted_changes)
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        return context
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    def subject(self):
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        entity = self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0)
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        return  u'%s #%s (%s)' % (self._cw.__('Updated %s' % entity.e_schema),
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                                  entity.eid, self.user_data['login'])