def check_user_share_quota(username, repo, users=[], groups=[]):
    """Check whether user has enough quota when share repo to users/groups.
    """
    if not users and not groups:
        return True

    if not seaserv.CALC_SHARE_USAGE:
        return True

    check_pass = False
    quota = seafile_api.get_user_quota(username)
    self_usage = seafile_api.get_user_self_usage(username)
    current_share_usage = seafile_api.get_user_share_usage(username)

    share_usage = 0
    if users:
        share_usage += seafile_api.get_repo_size(repo.id) * (len(users))

    if groups:
        grp_members = []
        for group in groups:
            grp_members += [ e.user_name for e in seaserv.get_group_members(group.id)]
        grp_members = set(grp_members)
        share_usage += seafile_api.get_repo_size(repo.id) * (len(grp_members) -1)
    if share_usage + self_usage + current_share_usage < quota:
        check_pass = True

    return check_pass

    def get(self, request, group_id, format=None):
        """
        Get all group members.
        """

        try:
            avatar_size = int(request.GET.get('avatar_size',
                AVATAR_DEFAULT_SIZE))
        except ValueError:
            avatar_size = AVATAR_DEFAULT_SIZE

        try:
            # only group member can get info of all group members
            if not is_group_member(group_id, request.user.username):
                error_msg = 'Permission denied.'
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

            members = seaserv.get_group_members(group_id)

        except SearpcError as e:
            logger.error(e)
            error_msg = 'Internal Server Error'
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        group_members = []
        is_admin = request.GET.get('is_admin', 'false')
        for m in members:
            # only return group admins
            if is_admin == 'true' and not m.is_staff:
                continue

            member_info = get_group_member_info(request, group_id, m.user_name, avatar_size)
            group_members.append(member_info)

        return Response(group_members)

    def _get_group_admins(self, group_id):
        members = seaserv.get_group_members(group_id)
        admin_members = filter(lambda m: m.is_staff, members)

        admins = []
        for u in admin_members:
            admins.append(u.user_name)
        return admins

def grpmsg_added_cb(sender, **kwargs):
    group_id = kwargs['group_id']
    from_email = kwargs['from_email']
    group_members = seaserv.get_group_members(int(group_id))

    notify_members = [ x.user_name for x in group_members if x.user_name != from_email ]

    detail = group_msg_to_json(group_id, email2nickname(from_email))
    UserNotification.objects.bulk_add_group_msg_notices(notify_members, detail)

def grpmsg_added_cb(sender, **kwargs):
    group_id = kwargs["group_id"]
    from_email = kwargs["from_email"]
    message = kwargs["message"]
    group_members = seaserv.get_group_members(int(group_id))

    notify_members = [x.user_name for x in group_members if x.user_name != from_email]

    detail = group_msg_to_json(group_id, from_email, message)
    UserNotification.objects.bulk_add_group_msg_notices(notify_members, detail)

def get_repo_shared_users(repo_id, repo_owner, include_groups=True):
    """Return a list contains users and group users. Repo owner is ommited.
    """
    ret = []
    users = seafile_api.list_repo_shared_to(repo_owner, repo_id)
    ret += [x.user for x in users]
    if include_groups:
        for e in seafile_api.list_repo_shared_group_by_user(repo_owner, repo_id):
            g_members = seaserv.get_group_members(e.group_id)
            ret += [x.user_name for x in g_members if x.user_name != repo_owner]

    return list(set(ret))

def attention(request):
    """
    Handle ajax request to query group members used in autocomplete.
    """
    if not request.is_ajax():
        raise Http404

    user = request.user.username
    name_str =  request.GET.get('name_startsWith')
    gids = request.GET.get('gids', '')
    result = []

    members = []
    for gid in gids.split('_'):
        try:
            gid = int(gid)
        except ValueError:
            continue

        if not is_group_user(gid, user):
            continue

        # Get all group users
        members += get_group_members(gid)

    member_names = []
    for m in members:
        if len(result) == 10:   # Return at most 10 results.
            break
        
        if m.user_name == user:
            continue
        
        if m.user_name in member_names:
            # Remove duplicated member names
            continue
        else:
            member_names.append(m.user_name)

        from base.templatetags.seahub_tags import email2nickname, char2pinyin
        nickname = email2nickname(m.user_name)
        pinyin = char2pinyin(nickname)
        if nickname.startswith(name_str) or pinyin.startswith(name_str):
            result.append({'contact_name': nickname})

    content_type = 'application/json; charset=utf-8'
    
    return HttpResponse(json.dumps(result), content_type=content_type)

def grpmsg_added_cb(sender, **kwargs):
    group_id = kwargs['group_id']
    from_email = kwargs['from_email']
    group_members = get_group_members(int(group_id))
    if len(group_members) > 15: # No need to send notification when group is 
        return                  # too large

    for m in group_members:
        if from_email == m.user_name:
            continue
        try:
            UserNotification.objects.get(to_user=m.user_name,
                                         msg_type='group_msg',
                                         detail=group_id)
        except UserNotification.DoesNotExist:
            n = UserNotification(to_user=m.user_name, msg_type='group_msg',
                                 detail=group_id)
            n.save()

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

    from base.templatetags.seahub_tags import at_pattern
    m = re.match(at_pattern, reply_msg)
    if m:
        nickname_or_emailprefix = m.group()[1:]
        for member in get_group_members(group_msg.group_id):
            # For every group member, get his username and nickname if
            # it exists, check whether match.
            username = member.user_name
            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='grpmsg_reply',
                                             detail=group_msg.id)
            except UserNotification.DoesNotExist:
                n = UserNotification(to_user=to_user,
                                     msg_type='grpmsg_reply',
                                     detail=group_msg.id)
                n.save()

    def get(self, request, group_id, format=None):
        """
        Get all group members.
        """

        try:
            avatar_size = int(request.GET.get('avatar_size',
                AVATAR_DEFAULT_SIZE))
        except ValueError:
            avatar_size = AVATAR_DEFAULT_SIZE

        try:
            members = seaserv.get_group_members(group_id)
        except SearpcError as e:
            logger.error(e)
            error_msg = _(u'Internal Server Error')
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        try:
            only_admin = int(request.GET.get('only_admin', 0))
        except ValueError:
            only_admin = 0

        if only_admin not in (0, 1):
            error_msg = _(u'Argument is not valid')
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        group_members = []
        for m in members:
            # only return group admins
            if only_admin and not m.is_staff:
                continue

            member_info = get_group_member_info(request, group_id, m.user_name, avatar_size)
            group_members.append(member_info)

        return Response(group_members)

def group_discuss(request, group):
    if group.is_pub:
        raise Http404

    username = request.user.username
    form = MessageForm()

    # remove user notifications
    UserNotification.objects.seen_group_msg_notices(username, group.id)

    # Get all group members.
    members = get_group_members(group.id)

    """group messages"""
    # Show 15 group messages per page.
    paginator = Paginator(GroupMessage.objects.filter(group_id=group.id).order_by("-timestamp"), 15)

    # Make sure page request is an int. If not, deliver first page.
    try:
        page = int(request.GET.get("page", "1"))
    except ValueError:
        page = 1

    # If page request (9999) is out of range, deliver last page of results.
    try:
        group_msgs = paginator.page(page)
    except (EmptyPage, InvalidPage):
        group_msgs = paginator.page(paginator.num_pages)

    group_msgs.page_range = paginator.get_page_range(group_msgs.number)

    # Force evaluate queryset to fix some database error for mysql.
    group_msgs.object_list = list(group_msgs.object_list)

    msg_attachments = MessageAttachment.objects.filter(group_message__in=group_msgs.object_list)

    msg_replies = MessageReply.objects.filter(reply_to__in=group_msgs.object_list)
    reply_to_list = [r.reply_to_id for r in msg_replies]

    for msg in group_msgs.object_list:
        msg.reply_cnt = reply_to_list.count(msg.id)
        msg.replies = []
        for r in msg_replies:
            if msg.id == r.reply_to_id:
                msg.replies.append(r)
        msg.replies = msg.replies[-3:]

        msg.attachments = []
        for att in msg_attachments:
            if att.group_message_id != msg.id:
                continue

            # Attachment name is file name or directory name.
            # If is top directory, use repo name instead.
            path = att.path
            if path == "/":
                repo = get_repo(att.repo_id)
                if not repo:
                    # TODO: what should we do here, tell user the repo
                    # is no longer exists?
                    continue
                att.name = repo.name
            else:
                path = path.rstrip("/")  # cut out last '/' if possible
                att.name = os.path.basename(path)

            # Load to discuss page if attachment is a image and from recommend.
            if att.attach_type == "file" and att.src == "recommend":
                att.filetype, att.fileext = get_file_type_and_ext(att.name)
                if att.filetype == IMAGE:
                    att.obj_id = get_file_id_by_path(att.repo_id, path)
                    if not att.obj_id:
                        att.err = _(u"File does not exist")
                    else:
                        att.token = seafile_api.get_fileserver_access_token(att.repo_id, att.obj_id, "view", username)
                        att.img_url = gen_file_get_url(att.token, att.name)

            msg.attachments.append(att)

    # get available modules(wiki, etc)
    mods_available = get_available_mods_by_group(group.id)
    mods_enabled = get_enabled_mods_by_group(group.id)

    return render_to_response(
        "group/group_discuss.html",
        {
            "group": group,
            "is_staff": group.is_staff,
            "group_msgs": group_msgs,
            "form": form,
            "mods_enabled": mods_enabled,
            "mods_available": mods_available,
        },
        context_instance=RequestContext(request),
    )

def render_group_info(request, group_id, form):
    group_id_int = int(group_id) # Checkeb by URL Conf

    # remove user notifications
    UserNotification.objects.filter(to_user=request.user.username,
                                    msg_type='group_msg',
                                    detail=str(group_id)).delete()
    
    group = get_group(group_id_int)
    if not group:
        return HttpResponseRedirect(reverse('group_list', args=[]))

    # Get all group members.
    members = get_group_members(group_id_int)
    
    # Check whether user belongs to the group.
    joined = is_group_user(group_id_int, request.user.username)
    if not joined and not request.user.is_staff:
        # Return group public info page.
        return render_to_response('group/group_pubinfo.html', {
                'members': members,
                'group': group,
                }, context_instance=RequestContext(request))

    is_staff = True if check_group_staff(group.id, request.user) else False
        
    managers = []
    common_members = []
    for member in members:
        if member.is_staff == 1:
            managers.append(member)
        else:
            common_members.append(member)

    org = request.user.org
    if org:
        repos = get_org_group_repos(org['org_id'], group_id_int,
                                    request.user.username)
    else:
        repos = get_group_repos(group_id_int, request.user.username)

    for repo in repos:
        repo.user_perm = check_permission(repo.props.id, request.user.username)

    """group messages"""
    # 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', '15'))
    except ValueError:
        current_page = 1
        per_page = 15

    msgs_plus_one = GroupMessage.objects.filter(
        group_id=group_id).order_by(
        '-timestamp')[per_page*(current_page-1) : per_page*current_page+1]

    if len(msgs_plus_one) == per_page + 1:
        page_next = True
    else:
        page_next = False

    group_msgs = msgs_plus_one[:per_page]
    attachments = MessageAttachment.objects.filter(group_message__in=group_msgs)

    msg_replies = MessageReply.objects.filter(reply_to__in=group_msgs)
    reply_to_list = [ r.reply_to_id for r in msg_replies ]
    
    for msg in group_msgs:
        msg.reply_cnt = reply_to_list.count(msg.id)
            
        for att in attachments:
            if msg.id == att.group_message_id:
                # Attachment name is file name or directory name.
                # If is top directory, use repo name instead.
                path = att.path
                if path == '/':
                    repo = get_repo(att.repo_id)
                    if not repo:
                        # TODO: what should we do here, tell user the repo
                        # is no longer exists?
                        continue
                    att.name = repo.name
                else:
                    # cut out last '/'
                    if path[-1] == '/':
                        path = path[:-1]
                    att.name = os.path.basename(path)
                msg.attachment = att

    contacts = Contact.objects.filter(user_email=request.user.username)

    return render_to_response("group/group_info.html", {
            "managers": managers,
            "common_members": common_members,
            "members": members,
            "repos": repos,
            "group_id": group_id,
            "group" : group,
            "is_staff": is_staff,
#.........这里部分代码省略.........

 def setUp(self):
     self.user2 = self.create_user()
     ccnet_api.group_add_member(self.group.id, self.user.username,
                                self.user2.username)
     g_members = [x.user_name for x in seaserv.get_group_members(self.group.id)]
     assert self.user2.username in g_members

def group_discuss(request, group_id):
    if request.method == 'POST':
        form = MessageForm(request.POST)

        if form.is_valid():
            msg = form.cleaned_data['message']
            message = GroupMessage()
            message.group_id = group_id
            message.from_email = request.user.username
            message.message = msg
            message.save()

            # send signal
            grpmsg_added.send(sender=GroupMessage, group_id=group_id,
                              from_email=request.user.username)
            # Always return an HttpResponseRedirect after successfully dealing
            # with POST data.
            return HttpResponseRedirect(reverse('group_discuss', args=[group_id]))
    else:
        form = MessageForm()
        
        op = request.GET.get('op', '')
        if op == 'delete':
            return group_remove(request, group_id)
        elif op == 'dismiss':
            return group_dismiss(request, group_id)
        elif op == 'quit':
            return group_quit(request, group_id)

    group_id_int = int(group_id) # Checkeb by URL Conf

    # remove user notifications
    UserNotification.objects.filter(to_user=request.user.username,
                                    msg_type='group_msg',
                                    detail=str(group_id)).delete()
    
    group = get_group(group_id_int)
    if not group:
        return HttpResponseRedirect(reverse('group_list', args=[]))
    
    # Check whether user belongs to the group.
    joined = is_group_user(group_id_int, request.user.username)
    if not joined and not request.user.is_staff:
        # Return group public info page.
        return render_to_response('group/group_pubinfo.html', {
                'members': members,
                'group': group,
                }, context_instance=RequestContext(request))

    # Get all group members.
    members = get_group_members(group_id_int)
    is_staff = True if check_group_staff(group.id, request.user) else False
        
    """group messages"""
    # Show 15 group messages per page.
    paginator = Paginator(GroupMessage.objects.filter(
            group_id=group_id).order_by('-timestamp'), 15)

    # Make sure page request is an int. If not, deliver first page.
    try:
        page = int(request.GET.get('page', '1'))
    except ValueError:
        page = 1

    # If page request (9999) is out of range, deliver last page of results.
    try:
        group_msgs = paginator.page(page)
    except (EmptyPage, InvalidPage):
        group_msgs = paginator.page(paginator.num_pages)

    group_msgs.page_range = paginator.get_page_range(group_msgs.number)

    # Force evaluate queryset to fix some database error for mysql.        
    group_msgs.object_list = list(group_msgs.object_list) 

    attachments = MessageAttachment.objects.filter(group_message__in=group_msgs.object_list)

    msg_replies = MessageReply.objects.filter(reply_to__in=group_msgs.object_list)
    reply_to_list = [ r.reply_to_id for r in msg_replies ]
    
    for msg in group_msgs.object_list:
        msg.reply_cnt = reply_to_list.count(msg.id)
        msg.replies = []
        for r in msg_replies:
            if msg.id == r.reply_to_id:
                msg.replies.append(r)
        msg.replies = msg.replies[-3:]
            
        for att in attachments:
            if msg.id == att.group_message_id:
                # Attachment name is file name or directory name.
                # If is top directory, use repo name instead.
                path = att.path
                if path == '/':
                    repo = get_repo(att.repo_id)
                    if not repo:
                        # TODO: what should we do here, tell user the repo
                        # is no longer exists?
                        continue
                    att.name = repo.name
#.........这里部分代码省略.........

def render_group_info(request, group_id, form):
    group_id_int = int(group_id) # Checkeb by URL Conf

    # remove user notifications
    UserNotification.objects.filter(to_user=request.user.username,
                                    msg_type='group_msg',
                                    detail=str(group_id)).delete()
    
    group = get_group(group_id_int)
    if not group:
        return HttpResponseRedirect(reverse('group_list', args=[]))

    # Get all group members.
    members = get_group_members(group_id_int)
    
    # Check whether user belongs to the group.
    joined = is_group_user(group_id_int, request.user.username)
    if not joined and not request.user.is_staff:
        # Return group public info page.
        return render_to_response('group/group_pubinfo.html', {
                'members': members,
                'group': group,
                }, context_instance=RequestContext(request))

    is_staff = True if check_group_staff(group.id, request.user) else False
        

    org = request.user.org
    if org:
        repos = get_org_group_repos(org['org_id'], group_id_int,
                                    request.user.username)
    else:
        repos = get_group_repos(group_id_int, request.user.username)

    recent_commits = []
    cmt_repo_dict = {}
    for repo in repos:
        repo.user_perm = check_permission(repo.props.id, request.user.username)
        cmmts = get_commits(repo.props.id, 0, 10)
        for c in cmmts:
            cmt_repo_dict[c.id] = repo
        recent_commits += cmmts

    recent_commits.sort(lambda x, y : cmp(y.props.ctime, x.props.ctime))
    recent_commits = recent_commits[:15]
    for cmt in recent_commits:
        cmt.repo = cmt_repo_dict[cmt.id]
        cmt.repo.password_set = is_passwd_set(cmt.props.repo_id,
                                              request.user.username)
        cmt.tp = cmt.props.desc.split(' ')[0]


    return render_to_response("group/group_info.html", {
            "members": members,
            "repos": repos,
            "recent_commits": recent_commits,
            "group_id": group_id,
            "group" : group,
            "is_staff": is_staff,
            "is_join": joined,
            "form": form,
            'create_shared_repo': True,
            'group_members_default_display': GROUP_MEMBERS_DEFAULT_DISPLAY,
            }, context_instance=RequestContext(request));