package bslack import ( "fmt" "regexp" "strings" "time" "github.com/42wim/matterbridge/bridge/config" "github.com/sirupsen/logrus" "github.com/slack-go/slack" ) // 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.channels.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) } } // For edits, only submessage has thread ts. // Ensures edits to threaded messages maintain their prefix hint on the // unthreaded end. if ev.SubMessage != nil { rmsg.ParentID = ev.SubMessage.ThreadTimestamp } 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.users.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 } if b.GetBool("UseFullName") && user.Profile.RealName != "" { rmsg.Username = user.Profile.RealName } 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 = handleRateLimit(b.Log, err); err != nil { b.Log.Errorf("Could not retrieve bot information: %#v", err) return err } } b.Log.Debugf("Found bot %#v", bot) if bot.Name != "" { 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(`<([^<\|]+)\|([^>]+)>`) codeFenceRE = regexp.MustCompile(`(?m)^` + "```" + `\w+$`) topicOrPurposeRE = regexp.MustCompile(`(?s)(@.+) (cleared|set)(?: the)? channel (topic|purpose)(?:: (.*))?`) ) func (b *Bslack) extractTopicOrPurpose(text string) (string, string) { r := topicOrPurposeRE.FindStringSubmatch(text) if len(r) == 5 { action, updateType, extracted := r[2], r[3], r[4] switch action { case "set": return updateType, extracted case "cleared": return updateType, "" } } b.Log.Warnf("Encountered channel topic or purpose change message with unexpected format: %s", text) return "unknown", "" } // @see https://api.slack.com/docs/message-formatting#linking_to_channels_and_users func (b *Bslack) replaceMention(text string) string { replaceFunc := func(match string) string { userID := strings.Trim(match, "@<>") if username := b.users.getUsername(userID); userID != "" { return "@" + username } return match } return mentionRE.ReplaceAllStringFunc(text, replaceFunc) } // @see https://api.slack.com/docs/message-formatting#linking_to_channels_and_users func (b *Bslack) replaceChannel(text string) string { for _, r := range channelRE.FindAllStringSubmatch(text, -1) { text = strings.Replace(text, r[0], "#"+r[1], 1) } return text } // @see https://api.slack.com/docs/message-formatting#variables func (b *Bslack) replaceVariable(text string) string { for _, r := range variableRE.FindAllStringSubmatch(text, -1) { if r[2] != "" { text = strings.Replace(text, r[0], "@"+r[2], 1) } else { text = strings.Replace(text, r[0], "@"+r[1], 1) } } return text } // @see https://api.slack.com/docs/message-formatting#linking_to_urls func (b *Bslack) replaceURL(text string) string { return urlRE.ReplaceAllString(text, "[${2}](${1})") } func (b *Bslack) replaceb0rkedMarkDown(text string) string { // taken from https://github.com/mattermost/mattermost-server/blob/master/app/slackimport.go // regexReplaceAllString := []struct { regex *regexp.Regexp rpl string }{ // bold { regexp.MustCompile(`(^|[\s.;,])\*(\S[^*\n]+)\*`), "$1**$2**", }, // strikethrough { regexp.MustCompile(`(^|[\s.;,])\~(\S[^~\n]+)\~`), "$1~~$2~~", }, // single paragraph blockquote // Slack converts > character to > { regexp.MustCompile(`(?sm)^>`), ">", }, } for _, rule := range regexReplaceAllString { text = rule.regex.ReplaceAllString(text, rule.rpl) } return text } func (b *Bslack) replaceCodeFence(text string) string { return codeFenceRE.ReplaceAllString(text, "```") } // getUsersInConversation returns an array of userIDs that are members of channelID func (b *Bslack) getUsersInConversation(channelID string) ([]string, error) { channelMembers := []string{} for { queryParams := &slack.GetUsersInConversationParameters{ ChannelID: channelID, } members, nextCursor, err := b.sc.GetUsersInConversation(queryParams) if err != nil { if err = handleRateLimit(b.Log, err); err != nil { return channelMembers, fmt.Errorf("Could not retrieve users in channels: %#v", err) } continue } channelMembers = append(channelMembers, members...) if nextCursor == "" { break } queryParams.Cursor = nextCursor } return channelMembers, nil } func handleRateLimit(log *logrus.Entry, err error) error { rateLimit, ok := err.(*slack.RateLimitedError) if !ok { return err } log.Infof("Rate-limited by Slack. Sleeping for %v", rateLimit.RetryAfter) time.Sleep(rateLimit.RetryAfter) return nil }