django-orchestra/orchestra/contrib/mailboxes/backends.py

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import logging
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import os
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import re
import textwrap
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from django.core.exceptions import ObjectDoesNotExist
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from django.utils.translation import ugettext_lazy as _
from orchestra.contrib.orchestration import ServiceController
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from orchestra.contrib.resources import ServiceMonitor
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from . import settings
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from .models import Address, Mailbox
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logger = logging.getLogger(__name__)
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class SieveFilteringMixin:
def generate_filter(self, mailbox, context):
name, content = mailbox.get_filtering()
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for box in re.findall(r'fileinto\s+"([^"]+)"', content):
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# create mailboxes if fileinfo is provided witout ':create' option
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context['box'] = box
self.append(textwrap.dedent("""
# Create %(box)s mailbox
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su %(user)s --shell /bin/bash << 'EOF'
mkdir -p "%(maildir)s/.%(box)s"
EOF
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if ! grep '%(box)s' %(maildir)s/subscriptions > /dev/null; then
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echo '%(box)s' >> %(maildir)s/subscriptions
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chown %(user)s:%(user)s %(maildir)s/subscriptions
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fi
""") % context
)
context['filtering_path'] = settings.MAILBOXES_SIEVE_PATH % context
context['filtering_cpath'] = re.sub(r'\.sieve$', '.svbin', context['filtering_path'])
if content:
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context['filtering'] = ('# %(banner)s\n' + content) % context
self.append(textwrap.dedent("""\
# Create and compile orchestra sieve filtering
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su %(user)s --shell /bin/bash << 'EOF'
mkdir -p $(dirname "%(filtering_path)s")
cat << ' EOF' > %(filtering_path)s
%(filtering)s
EOF
sievec %(filtering_path)s
EOF
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""") % context
)
else:
self.append("echo '' > %(filtering_path)s" % context)
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self.append('chown %(user)s:%(group)s %(filtering_path)s' % context)
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class UNIXUserMaildirBackend(SieveFilteringMixin, ServiceController):
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"""
Assumes that all system users on this servers all mail accounts.
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If you want to have system users AND mailboxes on the same server you should consider using virtual mailboxes.
Supports quota allocation via <tt>resources.disk.allocated</tt>.
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"""
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SHELL = '/dev/null'
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verbose_name = _("UNIX maildir user")
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model = 'mailboxes.Mailbox'
def save(self, mailbox):
context = self.get_context(mailbox)
self.append(textwrap.dedent("""
# Update/create %(user)s user state
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if id %(user)s ; then
old_password=$(getent shadow %(user)s | cut -d':' -f2)
usermod %(user)s \\
--shell %(initial_shell)s \\
--password '%(password)s'
if [[ "$old_password" != '%(password)s' ]]; then
# Postfix SASL caches passwords
RESTART_POSTFIX=1
fi
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else
useradd %(user)s \\
--home %(home)s \\
--password '%(password)s'
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fi
mkdir -p %(home)s
chmod 751 %(home)s
chown %(user)s:%(group)s %(home)s""") % context
)
if hasattr(mailbox, 'resources') and hasattr(mailbox.resources, 'disk'):
self.set_quota(mailbox, context)
self.generate_filter(mailbox, context)
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def set_quota(self, mailbox, context):
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allocated = mailbox.resources.disk.allocated
scale = mailbox.resources.disk.resource.get_scale()
context['quota'] = allocated * scale
#unit_to_bytes(mailbox.resources.disk.unit)
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self.append(textwrap.dedent("""
# Set Maildir quota for %(user)s
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su %(user)s --shell /bin/bash << 'EOF'
mkdir -p %(maildir)s
EOF
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if [ ! -f %(maildir)s/maildirsize ]; then
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echo "%(quota)iS" > %(maildir)s/maildirsize
chown %(user)s:%(group)s %(maildir)s/maildirsize
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else
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sed -i '1s/.*/%(quota)iS/' %(maildir)s/maildirsize
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fi""") % context
)
def delete(self, mailbox):
context = self.get_context(mailbox)
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self.append('mv %(home)s %(home)s.deleted || exit_code=$?' % context)
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self.append(textwrap.dedent("""
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nohup bash -c '{ sleep 2 && killall -u %(user)s -s KILL; }' &> /dev/null &
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killall -u %(user)s || true
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# Restart because of Postfix SASL caching credentials
userdel %(user)s && RESTART_POSTFIX=1 || true
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groupdel %(user)s || true""") % context
)
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def commit(self):
self.append('[[ $RESTART_POSTFIX -eq 1 ]] && service postfix restart')
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super().commit()
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def get_context(self, mailbox):
context = {
'user': mailbox.name,
'group': mailbox.name,
'name': mailbox.name,
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'password': mailbox.password if mailbox.active else '*%s' % mailbox.password,
'home': mailbox.get_home(),
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'maildir': os.path.join(mailbox.get_home(), 'Maildir'),
'initial_shell': self.SHELL,
'banner': self.get_banner(),
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}
return context
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#class DovecotPostfixPasswdVirtualUserBackend(SieveFilteringMixin, ServiceController):
# """
# WARNING: This backends is not fully implemented
# """
# DEFAULT_GROUP = 'postfix'
#
# verbose_name = _("Dovecot-Postfix virtualuser")
# model = 'mailboxes.Mailbox'
#
# def set_user(self, context):
# self.append(textwrap.dedent("""
# if grep '^%(user)s:' %(passwd_path)s > /dev/null ; then
# sed -i 's#^%(user)s:.*#%(passwd)s#' %(passwd_path)s
# else
# echo '%(passwd)s' >> %(passwd_path)s
# fi""") % context
# )
# self.append("mkdir -p %(home)s" % context)
# self.append("chown %(uid)s:%(gid)s %(home)s" % context)
#
# def set_mailbox(self, context):
# self.append(textwrap.dedent("""
# if ! grep '^%(user)s@%(mailbox_domain)s\s' %(virtual_mailbox_maps)s > /dev/null; then
# echo "%(user)s@%(mailbox_domain)s\tOK" >> %(virtual_mailbox_maps)s
# UPDATED_VIRTUAL_MAILBOX_MAPS=1
# fi""") % context
# )
#
# def save(self, mailbox):
# context = self.get_context(mailbox)
# self.set_user(context)
# self.set_mailbox(context)
# self.generate_filter(mailbox, context)
#
# def delete(self, mailbox):
# context = self.get_context(mailbox)
# self.append(textwrap.dedent("""
# nohup bash -c 'sleep 2 && killall -u %(uid)s -s KILL' &> /dev/null &
# killall -u %(uid)s || true
# sed -i '/^%(user)s:.*/d' %(passwd_path)s
# sed -i '/^%(user)s@%(mailbox_domain)s\s.*/d' %(virtual_mailbox_maps)s
# UPDATED_VIRTUAL_MAILBOX_MAPS=1""") % context
# )
# if context['deleted_home']:
# self.append("mv %(home)s %(deleted_home)s || exit_code=$?" % context)
# else:
# self.append("rm -fr %(home)s" % context)
#
# def get_extra_fields(self, mailbox, context):
# context['quota'] = self.get_quota(mailbox)
# return 'userdb_mail=maildir:~/Maildir {quota}'.format(**context)
#
# def get_quota(self, mailbox):
# try:
# quota = mailbox.resources.disk.allocated
# except (AttributeError, ObjectDoesNotExist):
# return ''
# unit = mailbox.resources.disk.unit[0].upper()
# return 'userdb_quota_rule=*:bytes=%i%s' % (quota, unit)
#
# def commit(self):
# context = {
# 'virtual_mailbox_maps': settings.MAILBOXES_VIRTUAL_MAILBOX_MAPS_PATH
# }
# self.append(textwrap.dedent("""
# [[ $UPDATED_VIRTUAL_MAILBOX_MAPS == 1 ]] && {
# postmap %(virtual_mailbox_maps)s
# }""") % context
# )
#
# def get_context(self, mailbox):
# context = {
# 'name': mailbox.name,
# 'user': mailbox.name,
# 'password': mailbox.password if mailbox.active else '*%s' % mailbox.password,
# 'uid': 10000 + mailbox.pk,
# 'gid': 10000 + mailbox.pk,
# 'group': self.DEFAULT_GROUP,
# 'quota': self.get_quota(mailbox),
# 'passwd_path': settings.MAILBOXES_PASSWD_PATH,
# 'home': mailbox.get_home(),
# 'banner': self.get_banner(),
# 'virtual_mailbox_maps': settings.MAILBOXES_VIRTUAL_MAILBOX_MAPS_PATH,
# 'mailbox_domain': settings.MAILBOXES_VIRTUAL_MAILBOX_DEFAULT_DOMAIN,
# }
# context['extra_fields'] = self.get_extra_fields(mailbox, context)
# context.update({
# 'passwd': '{user}:{password}:{uid}:{gid}::{home}::{extra_fields}'.format(**context),
# 'deleted_home': settings.MAILBOXES_MOVE_ON_DELETE_PATH % context,
# })
# return context
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class PostfixAddressVirtualDomainBackend(ServiceController):
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"""
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Secondary SMTP server without mailboxes in it, only syncs virtual domains.
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"""
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verbose_name = _("Postfix address virtdomain-only")
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model = 'mailboxes.Address'
related_models = (
('mailboxes.Mailbox', 'addresses'),
)
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doc_settings = (settings,
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('MAILBOXES_LOCAL_DOMAIN', 'MAILBOXES_VIRTUAL_ALIAS_DOMAINS_PATH')
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)
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def is_hosted_domain(self, domain):
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""" whether or not domain MX points to this server """
return domain.has_default_mx()
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def include_virtual_alias_domain(self, context):
domain = context['domain']
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if domain.name != context['local_domain'] and self.is_hosted_domain(domain):
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self.append(textwrap.dedent("""
# %(domain)s is a virtual domain belonging to this server
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if ! grep '^\s*%(domain)s\s*$' %(virtual_alias_domains)s > /dev/null; then
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echo '%(domain)s' >> %(virtual_alias_domains)s
UPDATED_VIRTUAL_ALIAS_DOMAINS=1
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fi""") % context
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)
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def is_last_domain(self, domain):
return not Address.objects.filter(domain=domain).exists()
def exclude_virtual_alias_domain(self, context):
domain = context['domain']
if self.is_last_domain(domain):
# Prevent deleting the same domain multiple times on bulk deletes
if not hasattr(self, '_excluded_domains'):
self._excluded_domains = set()
if domain.name not in self._excluded_domains:
self._excluded_domains.add(domain.name)
self.append(textwrap.dedent("""
# Delete %(domain)s virtual domain
if grep '^%(domain)s\s*$' %(virtual_alias_domains)s > /dev/null; then
sed -i '/^%(domain)s\s*/d' %(virtual_alias_domains)s
UPDATED_VIRTUAL_ALIAS_DOMAINS=1
fi""") % context
)
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def save(self, address):
context = self.get_context(address)
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self.include_virtual_alias_domain(context)
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return context
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def delete(self, address):
context = self.get_context(address)
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self.exclude_virtual_alias_domain(context)
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return context
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def commit(self):
context = self.get_context_files()
self.append(textwrap.dedent("""
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[[ $UPDATED_VIRTUAL_ALIAS_DOMAINS == 1 ]] && {
service postfix reload
}
exit $exit_code
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""") % context
)
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def get_context_files(self):
return {
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'virtual_alias_domains': settings.MAILBOXES_VIRTUAL_ALIAS_DOMAINS_PATH,
'virtual_alias_maps': settings.MAILBOXES_VIRTUAL_ALIAS_MAPS_PATH
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}
def get_context(self, address):
context = self.get_context_files()
context.update({
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'name': address.name,
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'domain': address.domain,
'email': address.email,
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'local_domain': settings.MAILBOXES_LOCAL_DOMAIN,
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})
return context
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class PostfixAddressBackend(PostfixAddressVirtualDomainBackend):
"""
Addresses based on Postfix virtual alias domains, includes <tt>PostfixAddressVirtualDomainBackend</tt>.
"""
verbose_name = _("Postfix address")
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doc_settings = (settings, (
'MAILBOXES_LOCAL_DOMAIN',
'MAILBOXES_VIRTUAL_ALIAS_DOMAINS_PATH',
'MAILBOXES_VIRTUAL_ALIAS_MAPS_PATH'
))
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def is_implicit_entry(self, context):
"""
check if virtual_alias_map entry can be omitted because the address is
equivalent to its local mbox
"""
return bool(
context['domain'].name == context['local_domain'] and
context['destination'] == context['name'] and
Mailbox.objects.filter(name=context['name']).exists())
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def update_virtual_alias_maps(self, address, context):
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context['destination'] = address.destination
if not self.is_implicit_entry(context):
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self.append(textwrap.dedent("""
# Set virtual alias entry for %(email)s
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LINE='%(email)s\t%(destination)s'
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if ! grep '^%(email)s\s' %(virtual_alias_maps)s > /dev/null; then
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# Add new line
echo "${LINE}" >> %(virtual_alias_maps)s
UPDATED_VIRTUAL_ALIAS_MAPS=1
else
# Update existing line, if needed
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if ! grep "^${LINE}$" %(virtual_alias_maps)s > /dev/null; then
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sed -i "s/^%(email)s\s.*$/${LINE}/" %(virtual_alias_maps)s
UPDATED_VIRTUAL_ALIAS_MAPS=1
fi
fi""") % context)
else:
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if not context['destination']:
msg = "Address %i is empty" % address.pk
self.append("\necho 'msg' >&2" % msg)
logger.warning(msg)
else:
self.append("\n# %(email)s %(destination)s entry is redundant" % context)
self.exclude_virtual_alias_maps(context)
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# Virtual mailbox stuff
# destination = []
# for mailbox in address.get_mailboxes():
# context['mailbox'] = mailbox
# destination.append("%(mailbox)s@%(local_domain)s" % context)
# for forward in address.forward:
# if '@' in forward:
# destination.append(forward)
def exclude_virtual_alias_maps(self, context):
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self.append(textwrap.dedent("""\
# Remove %(email)s virtual alias entry
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if grep '^%(email)s\s' %(virtual_alias_maps)s > /dev/null; then
sed -i '/^%(email)s\s/d' %(virtual_alias_maps)s
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UPDATED_VIRTUAL_ALIAS_MAPS=1
fi""") % context
)
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def save(self, address):
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context = super().save(address)
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self.update_virtual_alias_maps(address, context)
def delete(self, address):
context = super().delete(address)
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self.exclude_virtual_alias_maps(context)
def commit(self):
context = self.get_context_files()
self.append(textwrap.dedent("""
# Apply changes if needed
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[[ $UPDATED_VIRTUAL_ALIAS_DOMAINS == 1 ]] && {
service postfix reload
}
[[ $UPDATED_VIRTUAL_ALIAS_MAPS == 1 ]] && {
postmap %(virtual_alias_maps)s
}
exit $exit_code
""") % context
)
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class AutoresponseBackend(ServiceController):
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"""
WARNING: not implemented
"""
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verbose_name = _("Mail autoresponse")
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model = 'mailboxes.Autoresponse'
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class DovecotMaildirDisk(ServiceMonitor):
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"""
Maildir disk usage based on Dovecot maildirsize file
http://wiki2.dovecot.org/Quota/Maildir
"""
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model = 'mailboxes.Mailbox'
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resource = ServiceMonitor.DISK
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verbose_name = _("Dovecot Maildir size")
delete_old_equal_values = True
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doc_settings = (settings,
('MAILBOXES_MAILDIRSIZE_PATH',)
)
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def prepare(self):
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super().prepare()
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current_date = self.current_date.strftime("%Y-%m-%d %H:%M:%S %Z")
self.append(textwrap.dedent("""\
function monitor () {
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awk 'BEGIN { size = 0 } NR > 1 { size += $1 } END { print size }' $1 || echo 0
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}"""))
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def monitor(self, mailbox):
context = self.get_context(mailbox)
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self.append("echo %(object_id)s $(monitor %(maildir_path)s)" % context)
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def get_context(self, mailbox):
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context = {
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'home': mailbox.get_home(),
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'object_id': mailbox.pk
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}
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context['maildir_path'] = settings.MAILBOXES_MAILDIRSIZE_PATH % context
return context
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class PostfixMailscannerTraffic(ServiceMonitor):
"""
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A high-performance log parser.
Reads the mail.log file only once, for all users.
"""
model = 'mailboxes.Mailbox'
resource = ServiceMonitor.TRAFFIC
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verbose_name = _("Postfix-Mailscanner traffic")
script_executable = '/usr/bin/python'
monthly_sum_old_values = True
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doc_settings = (settings,
('MAILBOXES_MAIL_LOG_PATH',)
)
def prepare(self):
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mail_log = settings.MAILBOXES_MAIL_LOG_PATH
context = {
'current_date': self.current_date.strftime("%Y-%m-%d %H:%M:%S %Z"),
'mail_logs': str((mail_log, mail_log+'.1')),
}
self.append(textwrap.dedent("""\
import re
import sys
from datetime import datetime
from dateutil import tz
def to_local_timezone(date, tzlocal=tz.tzlocal()):
# Converts orchestra's UTC dates to local timezone
date = datetime.strptime(date, '%Y-%m-%d %H:%M:%S %Z')
date = date.replace(tzinfo=tz.tzutc())
date = date.astimezone(tzlocal)
return date
maillogs = {mail_logs}
end_datetime = to_local_timezone('{current_date}')
end_date = int(end_datetime.strftime('%Y%m%d%H%M%S'))
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months = ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec')
months = dict((m, '%02d' % n) for n, m in enumerate(months, 1))
def inside_period(month, day, time, ini_date):
global months
global end_datetime
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# Mar 9 17:13:22
month = months[month]
year = end_datetime.year
if month == '12' and end_datetime.month == 1:
year = year+1
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if len(day) == 1:
day = '0' + day
date = str(year) + month + day
date += time.replace(':', '')
return ini_date < int(date) < end_date
users = {{}}
delivers = {{}}
reverse = {{}}
def prepare(object_id, mailbox, ini_date):
global users
global delivers
global reverse
ini_date = to_local_timezone(ini_date)
ini_date = int(ini_date.strftime('%Y%m%d%H%M%S'))
users[mailbox] = (ini_date, object_id)
delivers[mailbox] = set()
reverse[mailbox] = set()
def monitor(users, delivers, reverse, maillogs):
targets = {{}}
counter = {{}}
user_regex = re.compile(r'\(Authenticated sender: ([^ ]+)\)')
for maillog in maillogs:
try:
with open(maillog, 'r') as maillog:
for line in maillog.readlines():
# Only search for Authenticated sendings
if '(Authenticated sender: ' in line:
username = user_regex.search(line).groups()[0]
try:
sender = users[username]
except KeyError:
continue
else:
month, day, time, __, proc, id = line.split()[:6]
if inside_period(month, day, time, sender[0]):
# Add new email
delivers[id[:-1]] = username
# Look for a MailScanner requeue ID
elif ' Requeue: ' in line:
id, __, req_id = line.split()[6:9]
id = id.split('.')[0]
try:
username = delivers[id]
except KeyError:
pass
else:
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targets[req_id] = (username, 0)
reverse[username].add(req_id)
# Look for the mail size and count the number of recipients of each email
else:
try:
month, day, time, __, proc, req_id, __, msize = line.split()[:8]
except ValueError:
# not interested in this line
continue
if proc.startswith('postfix/'):
req_id = req_id[:-1]
if msize.startswith('size='):
try:
target = targets[req_id]
except KeyError:
pass
else:
targets[req_id] = (target[0], int(msize[5:-1]))
elif proc.startswith('postfix/smtp'):
try:
target = targets[req_id]
except KeyError:
pass
else:
if inside_period(month, day, time, users[target[0]][0]):
try:
counter[req_id] += 1
except KeyError:
counter[req_id] = 1
except IOError as e:
sys.stderr.write(str(e)+'\\n')
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for username, opts in users.iteritems():
size = 0
for req_id in reverse[username]:
size += targets[req_id][1] * counter.get(req_id, 0)
print opts[1], size
""").format(**context)
)
def commit(self):
self.append('monitor(users, delivers, reverse, maillogs)')
def monitor(self, mailbox):
context = self.get_context(mailbox)
self.append("prepare(%(object_id)s, '%(mailbox)s', '%(last_date)s')" % context)
def get_context(self, mailbox):
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context = {
'mailbox': mailbox.name,
'object_id': mailbox.pk,
'last_date': self.get_last_date(mailbox.pk).strftime("%Y-%m-%d %H:%M:%S %Z"),
}
return context