"""Common utilies to format / semd emails.
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
from base64 import b64encode, b64decode
from itertools import repeat
from time import time
from email.MIMEMultipart import MIMEMultipart
from email.MIMEText import MIMEText
from email.MIMEImage import MIMEImage
from email.Header import Header
try:
from socket import gethostname
except ImportError:
def gethostname(): # gae
return 'XXX'
from cubicweb.view import EntityView
from cubicweb.entity import Entity
def header(ustring):
return Header(ustring.encode('UTF-8'), 'UTF-8')
def addrheader(uaddr, uname=None):
# even if an email address should be ascii, encode it using utf8 since
# automatic tests may generate non ascii email address
addr = uaddr.encode('UTF-8')
if uname:
return '%s <%s>' % (header(uname).encode(), addr)
return addr
def construct_message_id(appid, eid, withtimestamp=True):
if withtimestamp:
addrpart = 'eid=%s×tamp=%.10f' % (eid, time())
else:
addrpart = 'eid=%s' % eid
# we don't want any equal sign nor trailing newlines
leftpart = b64encode(addrpart, '.-').rstrip().rstrip('=')
return '<%s@%s.%s>' % (leftpart, appid, gethostname())
def parse_message_id(msgid, appid):
if msgid[0] == '<':
msgid = msgid[1:]
if msgid[-1] == '>':
msgid = msgid[:-1]
try:
values, qualif = msgid.split('@')
padding = len(values) % 4
values = b64decode(str(values + '='*padding), '.-')
values = dict(v.split('=') for v in values.split('&'))
fromappid, host = qualif.split('.', 1)
except:
return None
if appid != fromappid or host != gethostname():
return None
return values
def format_mail(uinfo, to_addrs, content, subject="",
cc_addrs=(), msgid=None, references=(), config=None):
"""Sends an Email to 'e_addr' with content 'content', and subject 'subject'
to_addrs and cc_addrs are expected to be a list of email address without
name
"""
assert type(content) is unicode, repr(content)
msg = MIMEText(content.encode('UTF-8'), 'plain', 'UTF-8')
# safety: keep only the first newline
subject = subject.splitlines()[0]
msg['Subject'] = header(subject)
if uinfo.get('email'):
email = uinfo['email']
elif config and config['sender-addr']:
email = unicode(config['sender-addr'])
else:
email = u''
if uinfo.get('name'):
name = uinfo['name']
elif config and config['sender-addr']:
name = unicode(config['sender-name'])
else:
name = u''
msg['From'] = addrheader(email, name)
if config and config['sender-addr'] and config['sender-addr'] != email:
appaddr = addrheader(config['sender-addr'], config['sender-name'])
msg['Reply-to'] = '%s, %s' % (msg['From'], appaddr)
elif email:
msg['Reply-to'] = msg['From']
if config is not None:
msg['X-CW'] = config.appid
unique_addrs = lambda addrs: sorted(set(addr for addr in addrs if addr is not None))
msg['To'] = ', '.join(addrheader(addr) for addr in unique_addrs(to_addrs))
if cc_addrs:
msg['Cc'] = ', '.join(addrheader(addr) for addr in unique_addrs(cc_addrs))
if msgid:
msg['Message-id'] = msgid
if references:
msg['References'] = ', '.join(references)
return msg
class HtmlEmail(MIMEMultipart):
def __init__(self, subject, textcontent, htmlcontent,
sendermail=None, sendername=None, recipients=None, ccrecipients=None):
MIMEMultipart.__init__(self, 'related')
self['Subject'] = header(subject)
self.preamble = 'This is a multi-part message in MIME format.'
# Attach alternative text message
alternative = MIMEMultipart('alternative')
self.attach(alternative)
msgtext = MIMEText(textcontent.encode('UTF-8'), 'plain', 'UTF-8')
alternative.attach(msgtext)
# Attach html message
msghtml = MIMEText(htmlcontent.encode('UTF-8'), 'html', 'UTF-8')
alternative.attach(msghtml)
if sendermail or sendername:
self['From'] = addrheader(sendermail, sendername)
if recipients:
self['To'] = ', '.join(addrheader(addr) for addr in recipients if addr is not None)
if ccrecipients:
self['Cc'] = ', '.join(addrheader(addr) for addr in ccrecipients if addr is not None)
def attach_image(self, data, htmlId):
image = MIMEImage(data)
image.add_header('Content-ID', '<%s>' % htmlId)
self.attach(image)
class NotificationView(EntityView):
"""abstract view implementing the "email" API (eg to simplify sending
notification)
"""
# XXX refactor this class to work with len(rset) > 1
msgid_timestamp = True
# this is usually the method to call
def render_and_send(self, **kwargs):
"""generate and send an email message for this view"""
delayed = kwargs.pop('delay_to_commit', None)
for recipients, msg in self.render_emails(**kwargs):
if delayed is None:
self.send(recipients, msg)
elif delayed:
self.send_on_commit(recipients, msg)
else:
self.send_now(recipients, msg)
def cell_call(self, row, col=0, **kwargs):
self.w(self.req._(self.content) % self.context(**kwargs))
def render_emails(self, **kwargs):
"""generate and send emails for this view (one per recipient)"""
self._kwargs = kwargs
recipients = self.recipients()
if not recipients:
self.info('skipping %s notification, no recipients', self.id)
return
if self.rset is not None:
entity = self.entity(self.row or 0, self.col or 0)
# if the view is using timestamp in message ids, no way to reference
# previous email
if not self.msgid_timestamp:
refs = [self.construct_message_id(eid)
for eid in entity.notification_references(self)]
else:
refs = ()
msgid = self.construct_message_id(entity.eid)
else:
refs = ()
msgid = None
req = self.req
self.user_data = req.user_data()
origlang = req.lang
for something in recipients:
if isinstance(something, Entity):
# hi-jack self.req to get a session for the returned user
self.req = self.req.hijack_user(something)
emailaddr = something.get_email()
else:
emailaddr, lang = something
self.req.set_language(lang)
# since the same view (eg self) may be called multiple time and we
# need a fresh stream at each iteration, reset it explicitly
self.w = None
# XXX call render before subject to set .row/.col attributes on the
# view
try:
content = self.render(row=0, col=0, **kwargs)
subject = self.subject()
except SkipEmail:
continue
msg = format_mail(self.user_data, [emailaddr], content, subject,
config=self.config, msgid=msgid, references=refs)
yield [emailaddr], msg
# restore language
req.set_language(origlang)
# recipients / email sending ###############################################
def recipients(self):
"""return a list of either 2-uple (email, language) or user entity to
who this email should be sent
"""
finder = self.vreg['components'].select('recipients_finder', self.req,
rset=self.rset,
row=self.row or 0,
col=self.col or 0)
return finder.recipients()
def send_now(self, recipients, msg):
self.config.sendmails([(msg, recipients)])
def send_on_commit(self, recipients, msg):
raise NotImplementedError
send = send_now
# email generation helpers #################################################
def construct_message_id(self, eid):
return construct_message_id(self.config.appid, eid, self.msgid_timestamp)
def format_field(self, attr, value):
return ':%(attr)s: %(value)s' % {'attr': attr, 'value': value}
def format_section(self, attr, value):
return '%(attr)s\n%(ul)s\n%(value)s\n' % {
'attr': attr, 'ul': '-'*len(attr), 'value': value}
def subject(self):
entity = self.entity(self.row or 0, self.col or 0)
subject = self.req._(self.message)
etype = entity.dc_type()
eid = entity.eid
login = self.user_data['login']
return self.req._('%(subject)s %(etype)s #%(eid)s (%(login)s)') % locals()
def context(self, **kwargs):
entity = self.entity(self.row or 0, self.col or 0)
for key, val in kwargs.iteritems():
if val and isinstance(val, unicode) and val.strip():
kwargs[key] = self.req._(val)
kwargs.update({'user': self.user_data['login'],
'eid': entity.eid,
'etype': entity.dc_type(),
'url': entity.absolute_url(),
'title': entity.dc_long_title(),})
return kwargs
class SkipEmail(Exception):
"""raise this if you decide to skip an email during its generation"""