author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Wed, 16 Sep 2009 17:52:54 +0200 | |
branch | 3.5 |
changeset 3268 | e9f4ea71e696 |
parent 3120 | 57ceabc6dfbc |
child 3370 | 62ed9981a770 |
permissions | -rw-r--r-- |
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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×tamp=%.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.req._(self.content) % self.context(**kwargs)) |
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159 |
|
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160 |
def render_emails(self, **kwargs): |
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161 |
"""generate and send emails for this view (one per recipient)""" |
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162 |
self._kwargs = kwargs |
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163 |
recipients = self.recipients() |
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164 |
if not recipients: |
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165 |
self.info('skipping %s notification, no recipients', self.id) |
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166 |
return |
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167 |
if self.rset is not None: |
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168 |
entity = self.entity(self.row or 0, self.col or 0) |
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169 |
# if the view is using timestamp in message ids, no way to reference |
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170 |
# previous email |
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171 |
if not self.msgid_timestamp: |
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172 |
refs = [self.construct_message_id(eid) |
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173 |
for eid in entity.notification_references(self)] |
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174 |
else: |
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175 |
refs = () |
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176 |
msgid = self.construct_message_id(entity.eid) |
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177 |
else: |
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178 |
refs = () |
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179 |
msgid = None |
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180 |
req = self.req |
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181 |
self.user_data = req.user_data() |
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182 |
origlang = req.lang |
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183 |
for something in recipients: |
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184 |
if isinstance(something, Entity): |
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185 |
# hi-jack self.req to get a session for the returned user |
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186 |
self.req = self.req.hijack_user(something) |
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187 |
emailaddr = something.get_email() |
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188 |
else: |
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189 |
emailaddr, lang = something |
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190 |
self.req.set_language(lang) |
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191 |
# since the same view (eg self) may be called multiple time and we |
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192 |
# need a fresh stream at each iteration, reset it explicitly |
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193 |
self.w = None |
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194 |
# XXX call render before subject to set .row/.col attributes on the |
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195 |
# view |
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196 |
try: |
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197 |
content = self.render(row=0, col=0, **kwargs) |
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198 |
subject = self.subject() |
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199 |
except SkipEmail: |
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200 |
continue |
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201 |
msg = format_mail(self.user_data, [emailaddr], content, subject, |
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202 |
config=self.config, msgid=msgid, references=refs) |
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203 |
yield [emailaddr], msg |
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204 |
# restore language |
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205 |
req.set_language(origlang) |
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206 |
|
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207 |
# recipients / email sending ############################################### |
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208 |
|
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209 |
def recipients(self): |
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210 |
"""return a list of either 2-uple (email, language) or user entity to |
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211 |
who this email should be sent |
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212 |
""" |
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213 |
finder = self.vreg['components'].select('recipients_finder', self.req, |
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214 |
rset=self.rset, |
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215 |
row=self.row or 0, |
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216 |
col=self.col or 0) |
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217 |
return finder.recipients() |
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218 |
|
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219 |
def send_now(self, recipients, msg): |
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220 |
self.config.sendmails([(msg, recipients)]) |
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221 |
|
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222 |
def send_on_commit(self, recipients, msg): |
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223 |
raise NotImplementedError |
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224 |
|
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225 |
send = send_now |
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226 |
|
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227 |
# email generation helpers ################################################# |
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228 |
|
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229 |
def construct_message_id(self, eid): |
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230 |
return construct_message_id(self.config.appid, eid, self.msgid_timestamp) |
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231 |
|
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232 |
def format_field(self, attr, value): |
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233 |
return ':%(attr)s: %(value)s' % {'attr': attr, 'value': value} |
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234 |
|
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235 |
def format_section(self, attr, value): |
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236 |
return '%(attr)s\n%(ul)s\n%(value)s\n' % { |
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237 |
'attr': attr, 'ul': '-'*len(attr), 'value': value} |
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238 |
|
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239 |
def subject(self): |
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240 |
entity = self.entity(self.row or 0, self.col or 0) |
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241 |
subject = self.req._(self.message) |
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242 |
etype = entity.dc_type() |
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243 |
eid = entity.eid |
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244 |
login = self.user_data['login'] |
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245 |
return self.req._('%(subject)s %(etype)s #%(eid)s (%(login)s)') % locals() |
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def context(self, **kwargs): |
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entity = self.entity(self.row or 0, self.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.req._(val) |
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enhance notification mecanism: recipients may return user entities, which will be used to create a fake session so one can check security during notification if necessary
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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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|
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|
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class SkipEmail(Exception): |
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"""raise this if you decide to skip an email during its generation""" |