sobjects/notification.py
author sylvain.thenault@logilab.fr
Thu, 14 May 2009 12:49:44 +0200
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"""some hooks and views to handle notification on entity's changes
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:organization: Logilab
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:copyright: 2001-2008 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 base64 import b64encode, b64decode
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from itertools import repeat
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from time import time
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try:
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    from socket import gethostname
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except ImportError:
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    def gethostname():
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        return 'XXX'
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from logilab.common.textutils import normalize_text
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from cubicweb import RegistryException
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from cubicweb.common.view import EntityView
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from cubicweb.common.appobject import Component
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from cubicweb.common.registerers import accepts_registerer
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from cubicweb.common.selectors import accept
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from cubicweb.common.mail import format_mail
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from cubicweb.server.pool import PreCommitOperation
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from cubicweb.server.hookhelper import SendMailOp
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from cubicweb.server.hooksmanager import Hook
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_ = unicode
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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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    id = 'recipients_finder'
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    __registerer__ = accepts_registerer
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    __selectors__ = (accept,)
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    accepts = ('Any',)
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    user_rql = ('Any X,E,A WHERE X is EUser, 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.config['default-recipients-mode']
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        if mode == 'users':
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            # use unsafe execute else we may don't have the right to see users
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            # to notify...
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            execute = self.req.unsafe_execute
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            dests = [(u.get_email(), u.property_value('ui.language'))
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                     for u in execute(self.user_rql, build_descr=True, propagate=True).entities()]
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        elif mode == 'default-dest-addrs':
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            lang = self.vreg.property_value('ui.language')
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            dests = zip(self.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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# hooks #######################################################################
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class RenderAndSendNotificationView(PreCommitOperation):
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    """delay rendering of notification view until precommit"""
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    def precommit_event(self):
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        if self.view.rset[0][0] in self.session.query_data('pendingeids', ()):
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            return # entity added and deleted in the same transaction
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        self.view.render_and_send(**getattr(self, 'viewargs', {}))
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class StatusChangeHook(Hook):
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    """notify when a workflowable entity has its state modified"""
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    events = ('after_add_entity',)
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    accepts = ('TrInfo',)
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    def call(self, session, entity):
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        if not entity.from_state: # not a transition
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            return
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        rset = entity.related('wf_info_for')
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        try:
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            view = session.vreg.select_view('notif_status_change',
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                                            session, rset, row=0)
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        except RegistryException:
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            return
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        comment = entity.printable_value('comment', format='text/plain')
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        if comment:
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            comment = normalize_text(comment, 80,
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                                     rest=entity.comment_format=='text/rest')
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        RenderAndSendNotificationView(session, view=view, viewargs={
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            'comment': comment, 'previous_state': entity.previous_state.name,
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            'current_state': entity.new_state.name})
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class RelationChangeHook(Hook):
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    events = ('before_add_relation', 'after_add_relation',
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              'before_delete_relation', 'after_delete_relation')
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    accepts = ('Any',)
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    def call(self, session, fromeid, rtype, toeid):
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        """if a notification view is defined for the event, send notification
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        email defined by the view
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        """
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        rset = session.eid_rset(fromeid)
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        vid = 'notif_%s_%s' % (self.event,  rtype)
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        try:
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            view = session.vreg.select_view(vid, session, rset, row=0)
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        except RegistryException:
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            return
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        RenderAndSendNotificationView(session, view=view)
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class EntityChangeHook(Hook):
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    events = ('after_add_entity',
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              'after_update_entity')
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    accepts = ('Any',)
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    def call(self, session, entity):
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        """if a notification view is defined for the event, send notification
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        email defined by the view
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        """
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        rset = entity.as_rset()
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        vid = 'notif_%s' % self.event
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        try:
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            view = session.vreg.select_view(vid, session, rset, row=0)
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        except RegistryException:
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            return
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        RenderAndSendNotificationView(session, view=view)
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# abstract or deactivated notification views and mixin ########################
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class NotificationView(EntityView):
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    """abstract view implementing the email API
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    all you have to do by default is :
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    * set id and accepts 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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    accepts = ()
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    id = None
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    msgid_timestamp = True
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    def recipients(self):
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        finder = self.vreg.select_component('recipients_finder',
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                                            req=self.req, rset=self.rset)
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        return finder.recipients()
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   146
        
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    def subject(self):
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        entity = self.entity(0, 0)
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        subject = self.req._(self.message)
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        etype = entity.dc_type()
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        eid = entity.eid
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        login = self.user_login()
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        return self.req._('%(subject)s %(etype)s #%(eid)s (%(login)s)') % locals()
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    def user_login(self):
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        # req is actually a session (we are on the server side), and we have to
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        # prevent nested internal session
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        return self.req.actual_session().user.login
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   159
    
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    def context(self, **kwargs):
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        entity = self.entity(0, 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.req._(val)
0
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        kwargs.update({'user': self.user_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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   171
    
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    def cell_call(self, row, col=0, **kwargs):
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        self.w(self.req._(self.content) % self.context(**kwargs))
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   174
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    def construct_message_id(self, eid):
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        return construct_message_id(self.config.appid, eid, self.msgid_timestamp)
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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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        self._kwargs = kwargs
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        recipients = self.recipients()
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   182
        if not recipients:
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   183
            self.info('skipping %s%s notification which has no recipients',
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   184
                      self.id, self.accepts)
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   185
            return
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   186
        if not isinstance(recipients[0], tuple):
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   187
            from warnings import warn
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            warn('recipients should now return a list of 2-uple (email, language)',
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                 DeprecationWarning, stacklevel=1)
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            lang = self.vreg.property_value('ui.language')
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   191
            recipients = zip(recipients, repeat(lang))
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   192
        entity = self.entity(0, 0)
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   193
        # if the view is using timestamp in message ids, no way to reference
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   194
        # previous email
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   195
        if not self.msgid_timestamp:
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   196
            refs = [self.construct_message_id(eid)
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   197
                    for eid in entity.notification_references(self)]
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   198
        else:
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   199
            refs = ()
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        msgid = self.construct_message_id(entity.eid)
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   201
        userdata = self.req.user_data()
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   202
        origlang = self.req.lang
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   203
        for emailaddr, lang in recipients:
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   204
            self.req.set_language(lang)
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   205
            # since the same view (eg self) may be called multiple time and we
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   206
            # need a fresh stream at each iteration, reset it explicitly
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   207
            self.w = None
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   208
            # call dispatch before subject to set .row/.col attributes on the view :/
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   209
            content = self.dispatch(row=0, col=0, **kwargs)
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   210
            subject = self.subject()
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   211
            msg = format_mail(userdata, [emailaddr], content, subject,
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                              config=self.config, msgid=msgid, references=refs)
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   213
            self.send([emailaddr], msg)
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   214
        # restore language
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   215
        self.req.set_language(origlang)
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diff changeset
   216
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    def send(self, recipients, msg):
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   218
        SendMailOp(self.req, recipients=recipients, msg=msg)
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   219
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   220
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   221
def construct_message_id(appid, eid, withtimestamp=True):
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   222
    if withtimestamp:
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   223
        addrpart = 'eid=%s&timestamp=%.10f' % (eid, time())
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   224
    else:
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   225
        addrpart = 'eid=%s' % eid
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   226
    # we don't want any equal sign nor trailing newlines
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   227
    leftpart = b64encode(addrpart, '.-').rstrip().rstrip('=')
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   228
    return '<%s@%s.%s>' % (leftpart, appid, gethostname())
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   229
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   230
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def parse_message_id(msgid, appid):
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   232
    if msgid[0] == '<':
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diff changeset
   233
        msgid = msgid[1:]
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   234
    if msgid[-1] == '>':
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   235
        msgid = msgid[:-1]
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   236
    try:
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   237
        values, qualif = msgid.split('@')
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   238
        padding = len(values) % 4
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diff changeset
   239
        values = b64decode(str(values + '='*padding), '.-')
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diff changeset
   240
        values = dict(v.split('=') for v in values.split('&'))
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   241
        fromappid, host = qualif.split('.', 1)
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   242
    except:
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   243
        return None
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   244
    if appid != fromappid or host != gethostname():
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diff changeset
   245
        return None
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diff changeset
   246
    return values
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diff changeset
   247
    
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   248
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class StatusChangeMixIn(object):
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   250
    id = 'notif_status_change'
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   251
    msgid_timestamp = True
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   252
    message = _('status changed')
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   253
    content = _("""
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%(user)s changed status from <%(previous_state)s> to <%(current_state)s> for entity
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   255
'%(title)s'
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diff changeset
   256
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%(comment)s
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   258
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url: %(url)s
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""")
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   262
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class ContentAddedMixIn(object):
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    """define emailcontent view for entity types for which you want to be notified
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    """
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    id = '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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###############################################################################
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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 NormalizedTextView(ContentAddedMixIn, NotificationView):
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    def context(self, **kwargs):
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        entity = self.entity(0, 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', 'text/rest')
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            content = normalize_text(content, 80, rest=contentformat=='text/rest')
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        return super(NormalizedTextView, self).context(content=content, **kwargs)
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    def subject(self):
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        entity = self.entity(0, 0)
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        return  u'%s #%s (%s)' % (self.req.__('New %s' % entity.e_schema),
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                                  entity.eid, self.user_login())
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class CardAddedView(NormalizedTextView):
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    """get notified from new cards"""
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    accepts = ('Card',)
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    content_attr = 'synopsis'
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