mail.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 09 Dec 2009 12:24:38 +0100
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merge
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"""Common utilies to format / semd emails.
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:organization: Logilab
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:copyright: 2001-2009 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 base64 import b64encode, b64decode
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from itertools import repeat
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from time import time
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from email.MIMEMultipart import MIMEMultipart
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from email.MIMEText import MIMEText
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from email.MIMEImage import MIMEImage
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from email.Header import Header
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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(): # gae
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        return 'XXX'
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from cubicweb.view import EntityView
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from cubicweb.entity import Entity
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def header(ustring):
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    return Header(ustring.encode('UTF-8'), 'UTF-8')
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def addrheader(uaddr, uname=None):
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    # even if an email address should be ascii, encode it using utf8 since
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    # automatic tests may generate non ascii email address
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    addr = uaddr.encode('UTF-8')
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    if uname:
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        return '%s <%s>' % (header(uname).encode(), addr)
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    return addr
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def construct_message_id(appid, eid, withtimestamp=True):
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    if withtimestamp:
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        addrpart = 'eid=%s&timestamp=%.10f' % (eid, time())
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    else:
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        addrpart = 'eid=%s' % eid
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    # we don't want any equal sign nor trailing newlines
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    leftpart = b64encode(addrpart, '.-').rstrip().rstrip('=')
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    return '<%s@%s.%s>' % (leftpart, appid, gethostname())
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def parse_message_id(msgid, appid):
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    if msgid[0] == '<':
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        msgid = msgid[1:]
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    if msgid[-1] == '>':
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        msgid = msgid[:-1]
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    try:
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        values, qualif = msgid.split('@')
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        padding = len(values) % 4
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        values = b64decode(str(values + '='*padding), '.-')
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        values = dict(v.split('=') for v in values.split('&'))
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        fromappid, host = qualif.split('.', 1)
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    except:
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        return None
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    if appid != fromappid or host != gethostname():
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        return None
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    return values
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def format_mail(uinfo, to_addrs, content, subject="",
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                cc_addrs=(), msgid=None, references=(), config=None):
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    """Sends an Email to 'e_addr' with content 'content', and subject 'subject'
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    to_addrs and cc_addrs are expected to be a list of email address without
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    name
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    """
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    assert type(content) is unicode, repr(content)
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    msg = MIMEText(content.encode('UTF-8'), 'plain', 'UTF-8')
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    # safety: keep only the first newline
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    subject = subject.splitlines()[0]
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    msg['Subject'] = header(subject)
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    if uinfo.get('email'):
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        email = uinfo['email']
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    elif config and config['sender-addr']:
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        email = unicode(config['sender-addr'])
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    else:
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        email = u''
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    if uinfo.get('name'):
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        name = uinfo['name']
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    elif config and config['sender-addr']:
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        name = unicode(config['sender-name'])
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    else:
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        name = u''
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    msg['From'] = addrheader(email, name)
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    if config and config['sender-addr'] and config['sender-addr'] != email:
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        appaddr = addrheader(config['sender-addr'], config['sender-name'])
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        msg['Reply-to'] = '%s, %s' % (msg['From'], appaddr)
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    elif email:
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        msg['Reply-to'] = msg['From']
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    if config is not None:
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        msg['X-CW'] = config.appid
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    unique_addrs = lambda addrs: sorted(set(addr for addr in addrs if addr is not None))
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    msg['To'] = ', '.join(addrheader(addr) for addr in unique_addrs(to_addrs))
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    if cc_addrs:
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        msg['Cc'] = ', '.join(addrheader(addr) for addr in unique_addrs(cc_addrs))
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    if msgid:
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        msg['Message-id'] = msgid
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    if references:
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        msg['References'] = ', '.join(references)
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    return msg
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class HtmlEmail(MIMEMultipart):
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    def __init__(self, subject, textcontent, htmlcontent,
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                 sendermail=None, sendername=None, recipients=None, ccrecipients=None):
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        MIMEMultipart.__init__(self, 'related')
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        self['Subject'] = header(subject)
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        self.preamble = 'This is a multi-part message in MIME format.'
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        # Attach alternative text message
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        alternative = MIMEMultipart('alternative')
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        self.attach(alternative)
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        msgtext = MIMEText(textcontent.encode('UTF-8'), 'plain', 'UTF-8')
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        alternative.attach(msgtext)
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        # Attach html message
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        msghtml = MIMEText(htmlcontent.encode('UTF-8'), 'html', 'UTF-8')
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        alternative.attach(msghtml)
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        if sendermail or sendername:
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            self['From'] = addrheader(sendermail, sendername)
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        if recipients:
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            self['To'] = ', '.join(addrheader(addr) for addr in recipients if addr is not None)
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        if ccrecipients:
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            self['Cc'] = ', '.join(addrheader(addr) for addr in ccrecipients if addr is not None)
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    def attach_image(self, data, htmlId):
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        image = MIMEImage(data)
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        image.add_header('Content-ID', '<%s>' % htmlId)
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        self.attach(image)
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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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    # 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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   159
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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.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 = self._cw.hijack_user(something)
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                emailaddr = something.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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   193
            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, ex:
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                # shouldn't make the whole transaction fail because of rendering
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                # error (unauthorized or such)
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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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   211
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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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   216
        who this email should be sent
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        """
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        # use super_session when available, we don't want to consider security
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        # when selecting recipients_finder
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        try:
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            req = self._cw.super_session
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        except AttributeError:
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            req = self._cw
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        finder = self._cw.vreg['components'].select('recipients_finder', req,
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                                                    rset=self.cw_rset,
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                                                    row=self.cw_row or 0,
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                                                    col=self.cw_col or 0)
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        return finder.recipients()
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    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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        raise NotImplementedError
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    send = send_now
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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, 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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    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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class SkipEmail(Exception):
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    """raise this if you decide to skip an email during its generation"""