package bslack import ( "bytes" "errors" "fmt" "html" "regexp" "strings" "sync" "time" "github.com/42wim/matterbridge/bridge" "github.com/42wim/matterbridge/bridge/config" "github.com/42wim/matterbridge/bridge/helper" "github.com/42wim/matterbridge/matterhook" "github.com/nlopes/slack" "github.com/rs/xid" ) type Bslack struct { mh *matterhook.Client sc *slack.Client rtm *slack.RTM Users []slack.User Usergroups []slack.UserGroup si *slack.Info channels []slack.Channel uuid string *bridge.Config sync.RWMutex } const messageDeleted = "message_deleted" func New(cfg *bridge.Config) bridge.Bridger { return &Bslack{Config: cfg, uuid: xid.New().String()} } func (b *Bslack) Command(cmd string) string { return "" } func (b *Bslack) Connect() error { b.RLock() defer b.RUnlock() if b.GetString("WebhookBindAddress") != "" { if b.GetString("WebhookURL") != "" { b.Log.Info("Connecting using webhookurl (sending) and webhookbindaddress (receiving)") b.mh = matterhook.New(b.GetString("WebhookURL"), matterhook.Config{InsecureSkipVerify: b.GetBool("SkipTLSVerify"), BindAddress: b.GetString("WebhookBindAddress")}) } else if b.GetString("Token") != "" { b.Log.Info("Connecting using token (sending)") b.sc = slack.New(b.GetString("Token")) b.rtm = b.sc.NewRTM() go b.rtm.ManageConnection() b.Log.Info("Connecting using webhookbindaddress (receiving)") b.mh = matterhook.New(b.GetString("WebhookURL"), matterhook.Config{InsecureSkipVerify: b.GetBool("SkipTLSVerify"), BindAddress: b.GetString("WebhookBindAddress")}) } else { b.Log.Info("Connecting using webhookbindaddress (receiving)") b.mh = matterhook.New(b.GetString("WebhookURL"), matterhook.Config{InsecureSkipVerify: b.GetBool("SkipTLSVerify"), BindAddress: b.GetString("WebhookBindAddress")}) } go b.handleSlack() return nil } if b.GetString("WebhookURL") != "" { b.Log.Info("Connecting using webhookurl (sending)") b.mh = matterhook.New(b.GetString("WebhookURL"), matterhook.Config{InsecureSkipVerify: b.GetBool("SkipTLSVerify"), DisableServer: true}) if b.GetString("Token") != "" { b.Log.Info("Connecting using token (receiving)") b.sc = slack.New(b.GetString("Token")) b.rtm = b.sc.NewRTM() go b.rtm.ManageConnection() go b.handleSlack() } } else if b.GetString("Token") != "" { b.Log.Info("Connecting using token (sending and receiving)") b.sc = slack.New(b.GetString("Token")) b.rtm = b.sc.NewRTM() go b.rtm.ManageConnection() go b.handleSlack() } if b.GetString("WebhookBindAddress") == "" && b.GetString("WebhookURL") == "" && b.GetString("Token") == "" { return errors.New("no connection method found. See that you have WebhookBindAddress, WebhookURL or Token configured") } return nil } func (b *Bslack) Disconnect() error { return b.rtm.Disconnect() } func (b *Bslack) JoinChannel(channel config.ChannelInfo) error { // we can only join channels using the API if b.sc != nil { if strings.HasPrefix(b.GetString("Token"), "xoxb") { // TODO check if bot has already joined channel return nil } _, err := b.sc.JoinChannel(channel.Name) if err != nil { switch err.Error() { case "name_taken", "restricted_action": case "default": { return err } } } } return nil } func (b *Bslack) Send(msg config.Message) (string, error) { b.Log.Debugf("=> Receiving %#v", msg) // Make a action /me of the message if msg.Event == config.EVENT_USER_ACTION { msg.Text = "_" + msg.Text + "_" } // Use webhook to send the message if b.GetString("WebhookURL") != "" { return b.sendWebhook(msg) } // get the slack channel schannel, err := b.getChannelByName(msg.Channel) if err != nil { return "", err } // Delete message if msg.Event == config.EVENT_MSG_DELETE { // some protocols echo deletes, but with empty ID if msg.ID == "" { return "", nil } // we get a "slack ", split it ts := strings.Fields(msg.ID) _, _, err := b.sc.DeleteMessage(schannel.ID, ts[1]) if err != nil { return msg.ID, err } return msg.ID, nil } // Prepend nick if configured if b.GetBool("PrefixMessagesWithNick") { msg.Text = msg.Username + msg.Text } // Edit message if we have an ID if msg.ID != "" { ts := strings.Fields(msg.ID) _, _, _, err := b.sc.UpdateMessage(schannel.ID, ts[1], msg.Text) if err != nil { return msg.ID, err } return msg.ID, nil } // create slack new post parameters np := slack.NewPostMessageParameters() if b.GetBool("PrefixMessagesWithNick") { np.AsUser = true } np.Username = msg.Username np.LinkNames = 1 // replace mentions np.IconURL = config.GetIconURL(&msg, b.GetString("iconurl")) if msg.Avatar != "" { np.IconURL = msg.Avatar } // add a callback ID so we can see we created it np.Attachments = append(np.Attachments, slack.Attachment{CallbackID: "matterbridge_" + b.uuid}) // add file attachments np.Attachments = append(np.Attachments, b.createAttach(msg.Extra)...) // add slack attachments (from another slack bridge) if len(msg.Extra["slack_attachment"]) > 0 { for _, attach := range msg.Extra["slack_attachment"] { np.Attachments = append(np.Attachments, attach.([]slack.Attachment)...) } } // Upload a file if it exists if msg.Extra != nil { for _, rmsg := range helper.HandleExtra(&msg, b.General) { b.sc.PostMessage(schannel.ID, rmsg.Username+rmsg.Text, np) } // check if we have files to upload (from slack, telegram or mattermost) if len(msg.Extra["file"]) > 0 { b.handleUploadFile(&msg, schannel.ID) } } // Post normal message _, id, err := b.sc.PostMessage(schannel.ID, msg.Text, np) if err != nil { return "", err } return "slack " + id, nil } func (b *Bslack) Reload(cfg *bridge.Config) (string, error) { return "", nil } func (b *Bslack) getAvatar(user string) string { var avatar string if b.Users != nil { for _, u := range b.Users { if user == u.Name { return u.Profile.Image48 } } } return avatar } func (b *Bslack) getChannelByName(name string) (*slack.Channel, error) { if b.channels == nil { return nil, fmt.Errorf("%s: channel %s not found (no channels found)", b.Account, name) } for _, channel := range b.channels { if channel.Name == name { return &channel, nil } } return nil, fmt.Errorf("%s: channel %s not found", b.Account, name) } func (b *Bslack) getChannelByID(ID string) (*slack.Channel, error) { if b.channels == nil { return nil, fmt.Errorf("%s: channel %s not found (no channels found)", b.Account, ID) } for _, channel := range b.channels { if channel.ID == ID { return &channel, nil } } return nil, fmt.Errorf("%s: channel %s not found", b.Account, ID) } func (b *Bslack) handleSlack() { messages := make(chan *config.Message) if b.GetString("WebhookBindAddress") != "" { b.Log.Debugf("Choosing webhooks based receiving") go b.handleMatterHook(messages) } else { b.Log.Debugf("Choosing token based receiving") go b.handleSlackClient(messages) } time.Sleep(time.Second) b.Log.Debug("Start listening for Slack messages") for message := range messages { b.Log.Debugf("<= Sending message from %s on %s to gateway", message.Username, b.Account) // cleanup the message message.Text = b.replaceMention(message.Text) message.Text = b.replaceVariable(message.Text) message.Text = b.replaceChannel(message.Text) message.Text = b.replaceURL(message.Text) message.Text = html.UnescapeString(message.Text) // Add the avatar message.Avatar = b.getAvatar(strings.ToLower(message.Username)) b.Log.Debugf("<= Message is %#v", message) b.Remote <- *message } } func (b *Bslack) handleSlackClient(messages chan *config.Message) { for msg := range b.rtm.IncomingEvents { if msg.Type != "user_typing" && msg.Type != "latency_report" { b.Log.Debugf("== Receiving event %#v", msg.Data) } switch ev := msg.Data.(type) { case *slack.MessageEvent: if b.skipMessageEvent(ev) { b.Log.Debugf("Skipped message: %#v", ev) continue } rmsg, err := b.handleMessageEvent(ev) if err != nil { b.Log.Errorf("%#v", err) continue } messages <- rmsg case *slack.OutgoingErrorEvent: b.Log.Debugf("%#v", ev.Error()) case *slack.ChannelJoinedEvent: b.Users, _ = b.sc.GetUsers() b.Usergroups, _ = b.sc.GetUserGroups() case *slack.ConnectedEvent: b.channels = ev.Info.Channels b.si = ev.Info b.Users, _ = b.sc.GetUsers() b.Usergroups, _ = b.sc.GetUserGroups() // add private channels groups, _ := b.sc.GetGroups(true) for _, g := range groups { channel := new(slack.Channel) channel.ID = g.ID channel.Name = g.Name b.channels = append(b.channels, *channel) } case *slack.InvalidAuthEvent: b.Log.Fatalf("Invalid Token %#v", ev) case *slack.ConnectionErrorEvent: b.Log.Errorf("Connection failed %#v %#v", ev.Error(), ev.ErrorObj) default: } } } func (b *Bslack) handleMatterHook(messages chan *config.Message) { for { message := b.mh.Receive() b.Log.Debugf("receiving from matterhook (slack) %#v", message) if message.UserName == "slackbot" { continue } messages <- &config.Message{Username: message.UserName, Text: message.Text, Channel: message.ChannelName} } } func (b *Bslack) userName(id string) string { for _, u := range b.Users { if u.ID == id { if u.Profile.DisplayName != "" { return u.Profile.DisplayName } return u.Name } } return "" } /* func (b *Bslack) userGroupName(id string) string { for _, u := range b.Usergroups { if u.ID == id { return u.Name } } return "" } */ // @see https://api.slack.com/docs/message-formatting#linking_to_channels_and_users func (b *Bslack) replaceMention(text string) string { results := regexp.MustCompile(`<@([a-zA-z0-9]+)>`).FindAllStringSubmatch(text, -1) for _, r := range results { text = strings.Replace(text, "<@"+r[1]+">", "@"+b.userName(r[1]), -1) } return text } // @see https://api.slack.com/docs/message-formatting#linking_to_channels_and_users func (b *Bslack) replaceChannel(text string) string { results := regexp.MustCompile(`<#[a-zA-Z0-9]+\|(.+?)>`).FindAllStringSubmatch(text, -1) for _, r := range results { 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 { results := regexp.MustCompile(``).FindAllStringSubmatch(text, -1) for _, r := range results { 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 { results := regexp.MustCompile(`<(.*?)(\|.*?)?>`).FindAllStringSubmatch(text, -1) for _, r := range results { 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) createAttach(extra map[string][]interface{}) []slack.Attachment { var attachs []slack.Attachment for _, v := range extra["attachments"] { entry := v.(map[string]interface{}) s := slack.Attachment{} s.Fallback = entry["fallback"].(string) s.Color = entry["color"].(string) s.Pretext = entry["pretext"].(string) s.AuthorName = entry["author_name"].(string) s.AuthorLink = entry["author_link"].(string) s.AuthorIcon = entry["author_icon"].(string) s.Title = entry["title"].(string) s.TitleLink = entry["title_link"].(string) s.Text = entry["text"].(string) s.ImageURL = entry["image_url"].(string) s.ThumbURL = entry["thumb_url"].(string) s.Footer = entry["footer"].(string) s.FooterIcon = entry["footer_icon"].(string) attachs = append(attachs, s) } return attachs } // handleDownloadFile handles file download func (b *Bslack) handleDownloadFile(rmsg *config.Message, file *slack.File) error { // if we have a file attached, download it (in memory) and put a pointer to it in msg.Extra // limit to 1MB for now comment := "" results := regexp.MustCompile(`.*?commented: (.*)`).FindAllStringSubmatch(rmsg.Text, -1) if len(results) > 0 { comment = results[0][1] } err := helper.HandleDownloadSize(b.Log, rmsg, file.Name, int64(file.Size), b.General) if err != nil { return err } // actually download the file data, err := helper.DownloadFileAuth(file.URLPrivateDownload, "Bearer "+b.GetString("Token")) if err != nil { return fmt.Errorf("download %s failed %#v", file.URLPrivateDownload, err) } // add the downloaded data to the message helper.HandleDownloadData(b.Log, rmsg, file.Name, comment, file.URLPrivateDownload, data, b.General) return nil } // handleUploadFile handles native upload of files func (b *Bslack) handleUploadFile(msg *config.Message, channelID string) (string, error) { var err error for _, f := range msg.Extra["file"] { fi := f.(config.FileInfo) _, err = b.sc.UploadFile(slack.FileUploadParameters{ Reader: bytes.NewReader(*fi.Data), Filename: fi.Name, Channels: []string{channelID}, InitialComment: fi.Comment, }) if err != nil { b.Log.Errorf("uploadfile %#v", err) } } return "", nil } // handleMessageEvent handles the message events func (b *Bslack) handleMessageEvent(ev *slack.MessageEvent) (*config.Message, error) { // update the userlist on a channel_join if ev.SubType == "channel_join" { b.Users, _ = b.sc.GetUsers() } // Edit message if !b.GetBool("EditDisable") && ev.SubMessage != nil && ev.SubMessage.ThreadTimestamp != ev.SubMessage.Timestamp { b.Log.Debugf("SubMessage %#v", ev.SubMessage) ev.User = ev.SubMessage.User ev.Text = ev.SubMessage.Text + b.GetString("EditSuffix") } // 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: "slack " + ev.Timestamp, Extra: make(map[string][]interface{})} // find the user id and name if ev.User != "" && ev.SubType != messageDeleted && ev.SubType != "file_comment" { user, err := b.rtm.GetUserInfo(ev.User) if err != nil { return nil, err } rmsg.UserID = user.ID rmsg.Username = user.Name if user.Profile.DisplayName != "" { rmsg.Username = user.Profile.DisplayName } } // See if we have some text in the attachments if rmsg.Text == "" { for _, attach := range ev.Attachments { if attach.Text != "" { rmsg.Text = attach.Text } else { rmsg.Text = attach.Fallback } } } // when using webhookURL we can't check if it's our webhook or not for now if rmsg.Username == "" && ev.BotID != "" && b.GetString("WebhookURL") == "" { bot, err := b.rtm.GetBotInfo(ev.BotID) if err != nil { return nil, err } if bot.Name != "" { rmsg.Username = bot.Name if ev.Username != "" { rmsg.Username = ev.Username } rmsg.UserID = bot.ID } // fixes issues with matterircd users if bot.Name == "Slack API Tester" { user, err := b.rtm.GetUserInfo(ev.User) if err != nil { return nil, err } rmsg.UserID = user.ID rmsg.Username = user.Name if user.Profile.DisplayName != "" { rmsg.Username = user.Profile.DisplayName } } } // file comments are set by the system (because there is no username given) if ev.SubType == "file_comment" { rmsg.Username = "system" } // do we have a /me action if ev.SubType == "me_message" { rmsg.Event = config.EVENT_USER_ACTION } // Handle join/leave if ev.SubType == "channel_leave" || ev.SubType == "channel_join" { rmsg.Username = "system" rmsg.Event = config.EVENT_JOIN_LEAVE } // edited messages have a submessage, use this timestamp if ev.SubMessage != nil { rmsg.ID = "slack " + ev.SubMessage.Timestamp } // deleted message event if ev.SubType == messageDeleted { rmsg.Text = config.EVENT_MSG_DELETE rmsg.Event = config.EVENT_MSG_DELETE rmsg.ID = "slack " + ev.DeletedTimestamp } // topic change event if ev.SubType == "channel_topic" || ev.SubType == "channel_purpose" { rmsg.Event = config.EVENT_TOPIC_CHANGE } // Only deleted messages can have a empty username and text if (rmsg.Text == "" || rmsg.Username == "") && ev.SubType != messageDeleted { // this is probably a webhook we couldn't resolve if ev.BotID != "" { return nil, fmt.Errorf("probably an incoming webhook we couldn't resolve (maybe ourselves)") } return nil, fmt.Errorf("empty message and not a deleted message") } // save the attachments, so that we can send them to other slack (compatible) bridges if len(ev.Attachments) > 0 { rmsg.Extra["slack_attachment"] = append(rmsg.Extra["slack_attachment"], ev.Attachments) } // if we have a file attached, download it (in memory) and put a pointer to it in msg.Extra if ev.File != nil { err := b.handleDownloadFile(&rmsg, ev.File) if err != nil { b.Log.Errorf("download failed: %s", err) } } return &rmsg, nil } // sendWebhook uses the configured WebhookURL to send the message func (b *Bslack) sendWebhook(msg config.Message) (string, error) { // skip events if msg.Event != "" { return "", nil } if b.GetBool("PrefixMessagesWithNick") { msg.Text = msg.Username + msg.Text } if msg.Extra != nil { // this sends a message only if we received a config.EVENT_FILE_FAILURE_SIZE for _, rmsg := range helper.HandleExtra(&msg, b.General) { iconURL := config.GetIconURL(&rmsg, b.GetString("iconurl")) matterMessage := matterhook.OMessage{IconURL: iconURL, Channel: msg.Channel, UserName: rmsg.Username, Text: rmsg.Text} b.mh.Send(matterMessage) } // webhook doesn't support file uploads, so we add the url manually if len(msg.Extra["file"]) > 0 { for _, f := range msg.Extra["file"] { fi := f.(config.FileInfo) if fi.URL != "" { msg.Text += " " + fi.URL } } } } // if we have native slack_attachments add them var attachs []slack.Attachment if len(msg.Extra["slack_attachment"]) > 0 { for _, attach := range msg.Extra["slack_attachment"] { attachs = append(attachs, attach.([]slack.Attachment)...) } } iconURL := config.GetIconURL(&msg, b.GetString("iconurl")) matterMessage := matterhook.OMessage{IconURL: iconURL, Attachments: attachs, Channel: msg.Channel, UserName: msg.Username, Text: msg.Text} if msg.Avatar != "" { matterMessage.IconURL = msg.Avatar } err := b.mh.Send(matterMessage) if err != nil { b.Log.Error(err) return "", err } return "", nil } // skipMessageEvent skips event that need to be skipped :-) func (b *Bslack) skipMessageEvent(ev *slack.MessageEvent) bool { if ev.SubType == "channel_leave" || ev.SubType == "channel_join" { return b.GetBool("nosendjoinpart") } // ignore pinned items if ev.SubType == "pinned_item" || ev.SubType == "unpinned_item" { return true } // do not send messages from ourself if b.GetString("WebhookURL") == "" && b.GetString("WebhookBindAddress") == "" && ev.Username == b.si.User.Name { return true } // skip messages we made ourselves if len(ev.Attachments) > 0 { if ev.Attachments[0].CallbackID == "matterbridge_"+b.uuid { return true } } if !b.GetBool("EditDisable") && ev.SubMessage != nil && ev.SubMessage.ThreadTimestamp != ev.SubMessage.Timestamp { // it seems ev.SubMessage.Edited == nil when slack unfurls // do not forward these messages #266 if ev.SubMessage.Edited == nil { return true } } return false }