def handle(self, *args, **options):
        db_users = seaserv.get_emailusers('DB', -1, -1)
        ldpa_imported_users = seaserv.get_emailusers('LDAPImport', -1, -1)

        admins = []
        for user in db_users + ldpa_imported_users:
            if user.is_staff:
                admins.append(user)

        for u in admins:
            # save current language
            cur_language = translation.get_language()

            # get and active user language
            user_language = self.get_user_language(u.email)
            translation.activate(user_language)

            send_html_email_with_dj_template(
                u.email, dj_template='notifications/notify_virus.html',
                subject=_('Virus detected on %s') % settings.SITE_NAME,
                priority=MAIL_PRIORITY.now
            )

            # restore current language
            translation.activate(cur_language)

def get_system_admins():
    db_users = seaserv.get_emailusers('DB', -1, -1)
    ldpa_imported_users = seaserv.get_emailusers('LDAPImport', -1, -1)

    admins = []
    for user in db_users + ldpa_imported_users:
        if user.is_staff:
            admins.append(user)

    return admins

def sys_user_admin(request):
    """List all users from database.
    """
    # Make sure page request is an int. If not, deliver first page.
    try:
        current_page = int(request.GET.get('page', '1'))
        per_page = int(request.GET.get('per_page', '25'))
    except ValueError:
        current_page = 1
        per_page = 25
    users_plus_one = get_emailusers('DB', per_page * (current_page - 1), per_page + 1)
    if len(users_plus_one) == per_page + 1:
        page_next = True
    else:
        page_next = False

    users = users_plus_one[:per_page]
    last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in users])
    for user in users:
        if user.props.id == request.user.id:
            user.is_self = True
        try:
            user.self_usage = seafile_api.get_user_self_usage(user.email)
            user.share_usage = seafile_api.get_user_share_usage(user.email)
            user.quota = seafile_api.get_user_quota(user.email)
        except:
            user.self_usage = -1
            user.share_usage = -1
            user.quota = -1
        # populate user last login time
        user.last_login = None
        for last_login in last_logins:
            if last_login.username == user.email:
                user.last_login = last_login.last_login

    have_ldap = True if len(get_emailusers('LDAP', 0, 1)) > 0 else False

    platform = get_platform_name()
    server_id = get_server_id()

    return render_to_response(
        'sysadmin/sys_useradmin.html', {
            'users': users,
            'current_page': current_page,
            'prev_page': current_page-1,
            'next_page': current_page+1,
            'per_page': per_page,
            'page_next': page_next,
            'CALC_SHARE_USAGE': CALC_SHARE_USAGE,
            'have_ldap': have_ldap,
            'platform': platform,
            'server_id': server_id[:8],
        },
        context_instance=RequestContext(request))

def sys_user_admin_admins(request):
    """List all admins from database.
    """
    users = get_emailusers('DB', -1, -1)

    admin_users = []
    not_admin_users = []
    for user in users:
        if user.is_staff is True:
            admin_users.append(user)
        else:
            not_admin_users.append(user)

    last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in admin_users])

    for user in admin_users:
        if user.props.id == request.user.id:
            user.is_self = True
        try:
            user.self_usage = seafile_api.get_user_self_usage(user.email)
            user.share_usage = seafile_api.get_user_share_usage(user.email)
            user.quota = seafile_api.get_user_quota(user.email)
        except:
            user.self_usage = -1
            user.share_usage = -1
            user.quota = -1
        # check user's role
        if user.role == GUEST_USER:
            user.is_guest = True
        else:
            user.is_guest = False
        # populate user last login time
        user.last_login = None
        for last_login in last_logins:
            if last_login.username == user.email:
                user.last_login = last_login.last_login

    have_ldap = True if len(get_emailusers('LDAP', 0, 1)) > 0 else False

    return render_to_response(
        'sysadmin/sys_useradmin_admins.html', {
            'admin_users': admin_users,
            'not_admin_users': not_admin_users,
            'CALC_SHARE_USAGE': CALC_SHARE_USAGE,
            'have_ldap': have_ldap,
            'default_user': DEFAULT_USER,
            'guest_user': GUEST_USER,
            }, context_instance=RequestContext(request))

def innerpub_msg_added_cb(sender, instance, **kwargs):
    from_email = instance.from_email

    users = get_emailusers(-1, -1)
    for u in users:
        if u.email == from_email:
            continue
        try:
            UserNotification.objects.get(to_user=u.email,
                                         msg_type='innerpub_msg')
        except UserNotification.DoesNotExist:
            n = UserNotification(to_user=u.email, msg_type='innerpub_msg',
                                 detail='')
            n.save()

def sys_user_admin_ldap(request):
    """List all users from LDAP.
    """
    # Make sure page request is an int. If not, deliver first page.
    try:
        current_page = int(request.GET.get('page', '1'))
        per_page = int(request.GET.get('per_page', '25'))
    except ValueError:
        current_page = 1
        per_page = 25
    users_plus_one = get_emailusers('LDAP', per_page * (current_page - 1), per_page + 1)
    if len(users_plus_one) == per_page + 1:
        page_next = True
    else:
        page_next = False

    users = users_plus_one[:per_page]
    last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in users])
    for user in users:
        if user.props.id == request.user.id:
            user.is_self = True

        _populate_user_quota_usage(user)

        # populate user last login time
        user.last_login = None
        for last_login in last_logins:
            if last_login.username == user.email:
                user.last_login = last_login.last_login

    return render_to_response(
        'sysadmin/sys_useradmin_ldap.html', {
            'users': users,
            'current_page': current_page,
            'prev_page': current_page-1,
            'next_page': current_page+1,
            'per_page': per_page,
            'page_next': page_next,
            'enable_guest': ENABLE_GUEST,
            'CALC_SHARE_USAGE': CALC_SHARE_USAGE,
        },
        context_instance=RequestContext(request))

def batch_user_make_admin(request):
    """Batch make users as admins.
    """
    if not request.is_ajax() or request.method != 'POST':
        raise Http404

    result = {}
    content_type = 'application/json; charset=utf-8'

    set_admin_emails = request.POST.get('set_admin_emails')
    set_admin_emails = string2list(set_admin_emails)

    success = []
    failed = []
    already_admin = []

    if len(get_emailusers('LDAP', 0, 1)) > 0:
        messages.error(request, _(u'Using LDAP now, can not add admin.'))
        result['success'] = True
        return HttpResponse(json.dumps(result), content_type=content_type)

    for email in set_admin_emails:
        try:
            user = User.objects.get(email=email)
            if user.is_staff is True:
                already_admin.append(email)
            else:
                user.is_staff = True
                user.save()
                success.append(email)
        except User.DoesNotExist:
            failed.append(email)

    for item in success + already_admin:
        messages.success(request, _(u'Successfully set %s as admin.') % item)
    for item in failed:
        messages.error(request, _(u'Failed to set %s as admin: user does not exist.') % item)

    result['success'] = True
    return HttpResponse(json.dumps(result), content_type=content_type)

def msgreply_save_handler(sender, instance, **kwargs):
    """
    Handle sending notification to '@<user>' when reply messages.
    """
    from_email = instance.from_email
    reply_msg = instance.message
    innerpub_msg = instance.reply_to
    to_user = ''


    m = re.match(at_pattern, reply_msg)
    if m:
        nickname_or_emailprefix = m.group()[1:]
        for member in get_emailusers(-1, -1):
            # For every user, get his username and nickname if
            # it exists, check whether match.
            username = member.email
            if username == from_email:
                continue
            
            p = get_first_object_or_none(
                Profile.objects.filter(user=username))
            nickname = p.nickname if p else ''
            if nickname == nickname_or_emailprefix or \
                    username.split('@')[0] == nickname_or_emailprefix:
                to_user = username
                break

        if to_user:
            # Send notification to the user if he replies someone else'
            # message.
            try:
                UserNotification.objects.get(to_user=to_user,
                                             msg_type='innerpubmsg_reply',
                                             detail=innerpub_msg.id)
            except UserNotification.DoesNotExist:
                n = UserNotification(to_user=to_user,
                                     msg_type='innerpubmsg_reply',
                                     detail=innerpub_msg.id)
                n.save()

def sys_user_admin(request):
    # Make sure page request is an int. If not, deliver first page.
    try:
        current_page = int(request.GET.get('page', '1'))
        per_page= int(request.GET.get('per_page', '25'))
    except ValueError:
        current_page = 1
        per_page = 25
    users_plus_one = get_emailusers(per_page * (current_page - 1), per_page + 1)
    if len(users_plus_one) == per_page + 1:
        page_next = True
    else:
        page_next = False

    users = users_plus_one[:per_page]
    for user in users:
        if user.props.id == request.user.id:
            user.is_self = True
        try:
            user.self_usage = seafile_api.get_user_self_usage(user.email)
            user.share_usage = seafile_api.get_user_share_usage(user.email)
            user.quota = seafile_api.get_user_quota(user.email)
        except:
            user.self_usage = -1
            user.share_usage = -1
            user.quota = -1
            
    return render_to_response(
        'sysadmin/sys_useradmin.html', {
            'users': users,
            'current_page': current_page,
            'prev_page': current_page-1,
            'next_page': current_page+1,
            'per_page': per_page,
            'page_next': page_next,
            'CALC_SHARE_USAGE': CALC_SHARE_USAGE,
        },
        context_instance=RequestContext(request))

def sys_user_admin(request):
    """List all users from database.
    """
    # Make sure page request is an int. If not, deliver first page.
    try:
        current_page = int(request.GET.get('page', '1'))
        per_page = int(request.GET.get('per_page', '25'))
    except ValueError:
        current_page = 1
        per_page = 25
    users_plus_one = get_emailusers('DB', per_page * (current_page - 1), per_page + 1)
    if len(users_plus_one) == per_page + 1:
        page_next = True
    else:
        page_next = False

    users = users_plus_one[:per_page]
    last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in users])
    if enable_trial_account:
        trial_users = TrialAccount.objects.filter(user_or_org__in=[x.email for x in users])
    else:
        trial_users = []
    for user in users:
        if user.props.id == request.user.id:
            user.is_self = True

        _populate_user_quota_usage(user)

        # check user's role
        if user.role == GUEST_USER:
            user.is_guest = True
        else:
            user.is_guest = False

        # populate user last login time
        user.last_login = None
        for last_login in last_logins:
            if last_login.username == user.email:
                user.last_login = last_login.last_login

        user.trial_info = None
        for trial_user in trial_users:
            if trial_user.user_or_org == user.email:
                user.trial_info = {'expire_date': trial_user.expire_date}

    have_ldap = True if len(get_emailusers('LDAP', 0, 1)) > 0 else False

    platform = get_platform_name()
    server_id = get_server_id()
    pro_server = 1 if is_pro_version() else 0

    return render_to_response(
        'sysadmin/sys_useradmin.html', {
            'users': users,
            'current_page': current_page,
            'prev_page': current_page-1,
            'next_page': current_page+1,
            'per_page': per_page,
            'page_next': page_next,
            'CALC_SHARE_USAGE': CALC_SHARE_USAGE,
            'have_ldap': have_ldap,
            'platform': platform,
            'server_id': server_id[:8],
            'default_user': DEFAULT_USER,
            'guest_user': GUEST_USER,
            'enable_guest': ENABLE_GUEST,
            'pro_server': pro_server,
        }, context_instance=RequestContext(request))