package bslack import ( "context" "fmt" "regexp" "strings" "time" "github.com/42wim/matterbridge/bridge/config" "github.com/nlopes/slack" ) func (b *Bslack) getUser(id string) *slack.User { b.usersMutex.RLock() defer b.usersMutex.RUnlock() return b.users[id] } func (b *Bslack) getUsername(id string) string { if user := b.getUser(id); user != nil { if user.Profile.DisplayName != "" { return user.Profile.DisplayName } return user.Name } b.Log.Warnf("Could not find user with ID '%s'", id) return "" } func (b *Bslack) getAvatar(id string) string { if user := b.getUser(id); user != nil { return user.Profile.Image48 } return "" } func (b *Bslack) getChannel(channel string) (*slack.Channel, error) { if strings.HasPrefix(channel, "ID:") { return b.getChannelByID(strings.TrimPrefix(channel, "ID:")) } return b.getChannelByName(channel) } func (b *Bslack) getChannelByName(name string) (*slack.Channel, error) { return b.getChannelBy(name, b.channelsByName) } func (b *Bslack) getChannelByID(ID string) (*slack.Channel, error) { return b.getChannelBy(ID, b.channelsByID) } func (b *Bslack) getChannelBy(lookupKey string, lookupMap map[string]*slack.Channel) (*slack.Channel, error) { b.channelsMutex.RLock() defer b.channelsMutex.RUnlock() if channel, ok := lookupMap[lookupKey]; ok { return channel, nil } return nil, fmt.Errorf("%s: channel %s not found", b.Account, lookupKey) } const minimumRefreshInterval = 10 * time.Second func (b *Bslack) populateUsers() { b.refreshMutex.Lock() if time.Now().Before(b.earliestUserRefresh) || b.refreshInProgress { b.Log.Debugf("Not refreshing user list as it was done less than %v ago.", minimumRefreshInterval) b.refreshMutex.Unlock() return } b.refreshInProgress = true b.refreshMutex.Unlock() newUsers := map[string]*slack.User{} pagination := b.sc.GetUsersPaginated(slack.GetUsersOptionLimit(200)) for { var err error pagination, err = pagination.Next(context.Background()) if err != nil { if pagination.Done(err) { break } if err = b.handleRateLimit(err); err != nil { b.Log.Errorf("Could not retrieve users: %#v", err) return } continue } for i := range pagination.Users { newUsers[pagination.Users[i].ID] = &pagination.Users[i] } } b.usersMutex.Lock() defer b.usersMutex.Unlock() b.users = newUsers b.refreshMutex.Lock() defer b.refreshMutex.Unlock() b.earliestUserRefresh = time.Now().Add(minimumRefreshInterval) b.refreshInProgress = false } func (b *Bslack) populateChannels() { b.refreshMutex.Lock() if time.Now().Before(b.earliestChannelRefresh) || b.refreshInProgress { b.Log.Debugf("Not refreshing channel list as it was done less than %v seconds ago.", minimumRefreshInterval) b.refreshMutex.Unlock() return } b.refreshInProgress = true b.refreshMutex.Unlock() newChannelsByID := map[string]*slack.Channel{} newChannelsByName := map[string]*slack.Channel{} // We only retrieve public and private channels, not IMs // and MPIMs as those do not have a channel name. queryParams := &slack.GetConversationsParameters{ ExcludeArchived: "true", Types: []string{"public_channel,private_channel"}, } for { channels, nextCursor, err := b.sc.GetConversations(queryParams) if err != nil { if err = b.handleRateLimit(err); err != nil { b.Log.Errorf("Could not retrieve channels: %#v", err) return } continue } for i := range channels { newChannelsByID[channels[i].ID] = &channels[i] newChannelsByName[channels[i].Name] = &channels[i] } if nextCursor == "" { break } queryParams.Cursor = nextCursor } b.channelsMutex.Lock() defer b.channelsMutex.Unlock() b.channelsByID = newChannelsByID b.channelsByName = newChannelsByName b.refreshMutex.Lock() defer b.refreshMutex.Unlock() b.earliestChannelRefresh = time.Now().Add(minimumRefreshInterval) b.refreshInProgress = false } // populateReceivedMessage shapes the initial Matterbridge message that we will forward to the // router before we apply message-dependent modifications. func (b *Bslack) populateReceivedMessage(ev *slack.MessageEvent) (*config.Message, error) { // Use our own func because rtm.GetChannelInfo doesn't work for private channels. channel, err := b.getChannelByID(ev.Channel) if err != nil { return nil, err } rmsg := &config.Message{ Text: ev.Text, Channel: channel.Name, Account: b.Account, ID: ev.Timestamp, Extra: make(map[string][]interface{}), ParentID: ev.ThreadTimestamp, Protocol: b.Protocol, } if b.useChannelID { rmsg.Channel = "ID:" + channel.ID } // Handle 'edit' messages. if ev.SubMessage != nil && !b.GetBool(editDisableConfig) { rmsg.ID = ev.SubMessage.Timestamp if ev.SubMessage.ThreadTimestamp != ev.SubMessage.Timestamp { b.Log.Debugf("SubMessage %#v", ev.SubMessage) rmsg.Text = ev.SubMessage.Text + b.GetString(editSuffixConfig) } } if err = b.populateMessageWithUserInfo(ev, rmsg); err != nil { return nil, err } return rmsg, err } func (b *Bslack) populateMessageWithUserInfo(ev *slack.MessageEvent, rmsg *config.Message) error { if ev.SubType == sMessageDeleted || ev.SubType == sFileComment { return nil } // First, deal with bot-originating messages but only do so when not using webhooks: we // would not be able to distinguish which bot would be sending them. if err := b.populateMessageWithBotInfo(ev, rmsg); err != nil { return err } // Second, deal with "real" users if we have the necessary information. var userID string switch { case ev.User != "": userID = ev.User case ev.SubMessage != nil && ev.SubMessage.User != "": userID = ev.SubMessage.User default: return nil } user := b.getUser(userID) if user == nil { return fmt.Errorf("could not find information for user with id %s", ev.User) } rmsg.UserID = user.ID rmsg.Username = user.Name if user.Profile.DisplayName != "" { rmsg.Username = user.Profile.DisplayName } return nil } func (b *Bslack) populateMessageWithBotInfo(ev *slack.MessageEvent, rmsg *config.Message) error { if ev.BotID == "" || b.GetString(outgoingWebhookConfig) != "" { return nil } var err error var bot *slack.Bot for { bot, err = b.rtm.GetBotInfo(ev.BotID) if err == nil { break } if err = b.handleRateLimit(err); err != nil { b.Log.Errorf("Could not retrieve bot information: %#v", err) return err } } if bot.Name != "" && bot.Name != "Slack API Tester" { rmsg.Username = bot.Name if ev.Username != "" { rmsg.Username = ev.Username } rmsg.UserID = bot.ID } return nil } var ( mentionRE = regexp.MustCompile(`<@([a-zA-Z0-9]+)>`) channelRE = regexp.MustCompile(`<#[a-zA-Z0-9]+\|(.+?)>`) variableRE = regexp.MustCompile(`<!((?:subteam\^)?[a-zA-Z0-9]+)(?:\|@?(.+?))?>`) urlRE = regexp.MustCompile(`<(.*?)(\|.*?)?>`) topicOrPurposeRE = regexp.MustCompile(`(?s)(@.+) (cleared|set)(?: the)? channel (topic|purpose)(?:: (.*))?`) ) func (b *Bslack) extractTopicOrPurpose(text string) (string, string) { r := topicOrPurposeRE.FindStringSubmatch(text) if len(r) == 5 { action, updateType, extracted := r[2], r[3], r[4] switch action { case "set": return updateType, extracted case "cleared": return updateType, "" } } b.Log.Warnf("Encountered channel topic or purpose change message with unexpected format: %s", text) return "unknown", "" } // @see https://api.slack.com/docs/message-formatting#linking_to_channels_and_users func (b *Bslack) replaceMention(text string) string { replaceFunc := func(match string) string { userID := strings.Trim(match, "@<>") if username := b.getUsername(userID); userID != "" { return "@" + username } return match } return mentionRE.ReplaceAllStringFunc(text, replaceFunc) } // @see https://api.slack.com/docs/message-formatting#linking_to_channels_and_users func (b *Bslack) replaceChannel(text string) string { for _, r := range channelRE.FindAllStringSubmatch(text, -1) { text = strings.Replace(text, r[0], "#"+r[1], 1) } return text } // @see https://api.slack.com/docs/message-formatting#variables func (b *Bslack) replaceVariable(text string) string { for _, r := range variableRE.FindAllStringSubmatch(text, -1) { if r[2] != "" { text = strings.Replace(text, r[0], "@"+r[2], 1) } else { text = strings.Replace(text, r[0], "@"+r[1], 1) } } return text } // @see https://api.slack.com/docs/message-formatting#linking_to_urls func (b *Bslack) replaceURL(text string) string { for _, r := range urlRE.FindAllStringSubmatch(text, -1) { if len(strings.TrimSpace(r[2])) == 1 { // A display text separator was found, but the text was blank text = strings.Replace(text, r[0], "", 1) } else { text = strings.Replace(text, r[0], r[1], 1) } } return text } func (b *Bslack) handleRateLimit(err error) error { rateLimit, ok := err.(*slack.RateLimitedError) if !ok { return err } b.Log.Infof("Rate-limited by Slack. Sleeping for %v", rateLimit.RetryAfter) time.Sleep(rateLimit.RetryAfter) return nil }