plugin account, tools: some cleaning account + email and password tools:

- plugin misc account has been reordered and cleaned a bit.
    - new xmpp_domain setting is used to get the domain name of main XMPP server
    - password generation method has been moved to tools.utils
    - email sending method has been moved to tools.email

src/tools/email.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+
+# SàT: a jabber client
+# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""email sending facilities"""
+
+from __future__ import absolute_import
+from sat.core.constants import Const as C
+from sat.core.log import getLogger
+log = getLogger(__name__)
+from twisted.mail import smtp
+from email.mime.text import MIMEText
+
+
+
+def sendEmail(host, to_emails, subject=u'', body=u'', from_email=None):
+    """send an email using SàT configuration
+
+    @param to_emails(list[unicode]): list of recipients
+    @param subject(unicode): subject of the message
+    @param body(unicode): body of the message
+    @param from_email(unicode): address of the sender
+    @return (D): same as smtp.sendmail
+    """
+    email_host = host.memory.getConfig(None, u'email_server') or u'localhost'
+    email_from = host.memory.getConfig(None, u'email_from')
+    if email_from is None:
+        # we suppose that email domain and XMPP domain are identical
+        domain = host.memory.getConfig(None, u'xmpp_domain', u'example.net')
+        email_from = u'no_reply@' + domain
+    email_sender_domain = host.memory.getConfig(None, u'email_sender_domain')
+    email_port = int(host.memory.getConfig(None, u'email_port', 25))
+    email_username = host.memory.getConfig(None, u'email_username')
+    email_password = host.memory.getConfig(None, u'email_password')
+    email_auth = C.bool(host.memory.getConfig(None, 'email_auth', False))
+    email_starttls = C.bool(host.memory.getConfig(None, 'email_starttls', False))
+
+    msg = MIMEText(body, 'plain', 'UTF-8')
+    msg[u'Subject'] = subject
+    msg[u'From'] = email_from
+    msg[u'To'] = u", ".join(to_emails)
+
+    return smtp.sendmail(email_host.encode("utf-8"),
+                         email_from.encode("utf-8"),
+                         [email.encode("utf-8") for email in to_emails],
+                         msg.as_string(),
+                         senderDomainName = email_sender_domain.encode("utf-8") if email_sender_domain else None,
+                         port = email_port,
+                         username = email_username.encode("utf-8") if email_username else None,
+                         password = email_password.encode("utf-8") if email_password else None,
+                         requireAuthentication = email_auth,
+                         requireTransportSecurity = email_starttls)