Add welcome message functionality

(Telegram and whatsapp for now)

bridge/config/config.go

@@ -15,6 +15,7 @@ import (
 )
 
 const (
+	EventWelcomeMsg        = "welcome"
 	EventJoinLeave         = "join_leave"
 	EventTopicChange       = "topic_change"
 	EventFailure           = "failure"

bridge/telegram/handlers.go

@@ -287,7 +287,9 @@ func (b *Btelegram) handleUserJoin(update tgbotapi.Update) {
 			Event:    config.EventJoinLeave,
 			Text:     "joined chat",
 		}
+		b.Remote <- rmsg
 
+		rmsg.Event = config.EventWelcomeMsg
 		b.Remote <- rmsg
 	}
 }

bridge/whatsappmulti/handlers.go

@@ -53,7 +53,9 @@ func (b *Bwhatsapp) handleUserJoin(event *events.GroupInfo) {
 			Event:    config.EventJoinLeave,
 			Text:     "joined chat",
 		}
+		b.Remote <- rmsg
 
+		rmsg.Event = config.EventWelcomeMsg
 		b.Remote <- rmsg
 	}
 }

gateway/channelstore.go

@@ -0,0 +1,68 @@
+package gateway
+
+import (
+	"encoding/gob"
+
+	"github.com/42wim/matterbridge/bridge/config"
+	"github.com/philippgille/gokv"
+	"github.com/philippgille/gokv/bbolt"
+	"github.com/philippgille/gokv/encoding"
+)
+
+type ChannelData struct {
+	HasWelcomeMessage bool
+	WelcomeMessage    config.Message
+}
+
+func (r *Router) getChannelStore(path string) gokv.Store {
+	gob.Register(map[string]interface{}{})
+	gob.Register(config.FileInfo{})
+
+	options := bbolt.Options{
+		BucketName: "ChannelData",
+		Path:       path,
+		Codec:      encoding.Gob,
+	}
+
+	gob.Register(map[string]interface{}{})
+
+	store, err := bbolt.NewStore(options)
+	if err != nil {
+		r.logger.Errorf("Could not connect to db: %s", path)
+	}
+
+	return store
+}
+
+func (r *Router) getWelcomeMessage(Channel string) *config.Message {
+	channelData := new(ChannelData)
+	found, err := r.ChannelStore.Get(Channel, channelData)
+	if err != nil {
+		r.logger.Error(err)
+	}
+
+	if found && channelData.HasWelcomeMessage {
+		return &channelData.WelcomeMessage
+	}
+
+	return nil
+}
+
+func (r *Router) setWelcomeMessage(Channel string, newWelcomeMessage *config.Message) error {
+	channelData := new(ChannelData)
+	r.ChannelStore.Get(Channel, channelData)
+
+	if newWelcomeMessage == nil {
+		channelData.HasWelcomeMessage = false
+		channelData.WelcomeMessage = config.Message{}
+	} else {
+		channelData.HasWelcomeMessage = true
+		channelData.WelcomeMessage = *newWelcomeMessage
+	}
+
+	err := r.ChannelStore.Set(Channel, channelData)
+	if err != nil {
+		r.logger.Errorf(err.Error())
+	}
+	return err
+}

gateway/command.go

@@ -1,43 +1,82 @@
 package gateway
 
 import (
+	"strings"
+
 	"github.com/42wim/matterbridge/bridge/config"
 )
 
 // returns true if a command was registered (therefore a should not be relayed
 func (r *Router) handleCommand(msg *config.Message) bool {
-	switch text := msg.Text; text {
-	case "!chatId":
+	help := `!optout - opt out from all message relaying
+	!optoutmedia - only opt out from relaying attachments
+	!optin - opt back into chat relaying
+	!setwelcome - set channel welcome message (admin)
+	!unsetwelcome - clear channel welcome message (admin)
+	!help - display this message`
+
+	isAdmin := r.isAdmin(msg)
+	addTextFromCaptions(msg)
+	cmd := msg.Text
+
+	switch {
+	case cmd == "!help":
+		r.logger.Debug("!help")
+		r.replyCmd(msg, help)
+	case cmd == "!chatId":
 		r.logger.Infof("!chatId: %s", msg.Channel)
-	case "!optin":
+	case cmd == "!userId":
+		r.logger.Infof("!userId: %s", msg.UserID)
+	case cmd == "!ping":
+		r.logger.Debug("!pong: %s,%s", msg.Channel, msg.UserID)
+		r.replyCmd(msg, "pong!")
+	case cmd == "!pingdm":
+		r.logger.Debug("!pongdm: %s,%s", msg.Channel, msg.UserID)
+		r.replyDM(msg, "pong!")
+	case cmd == "!optin":
 		r.logger.Debugf("!optin: %s", msg.UserID)
 		r.handleOptOutCmd(msg, OptIn)
-	case "!optout":
+	case cmd == "!optout":
 		r.logger.Debugf("!optout: %s", msg.UserID)
 		r.handleOptOutCmd(msg, OptOut)
-	case "!optoutmedia":
+	case cmd == "!optoutmedia":
 		r.logger.Debugf("!optoutmedia: %s", msg.UserID)
 		r.handleOptOutCmd(msg, OptOutMediaOnly)
-	case "!help":
-		r.logger.Debug("!help")
-		help := `!optout - opt out from all message relaying
-!optoutmedia - only opt out from relaying attachments
-!optin - opt back into chat relaying
-!help - display this message`
-
-		r.replyCmd(msg, help)
-	case "!ping":
-		r.logger.Debug("!pong")
-		r.replyCmd(msg, "pong!")
-	case "!pingdm":
-		r.logger.Debug("!pongdm")
-		r.replyDM(msg, "pong!")
+	case isAdmin && strings.HasPrefix(cmd, "!setwelcome"):
+		r.logger.Debugf("!setwelcome: %s - %+v", msg.Channel, msg)
+		r.handleWelcomeCmd(msg, msg)
+	case isAdmin && strings.HasPrefix(cmd, "!unsetwelcome"):
+		r.logger.Debugf("!unsetwelcome: %s", msg.Channel)
+		r.handleWelcomeCmd(msg, nil)
+	case cmd == "!echowelcome":
+		r.logger.Debugf("!echowelcome: %s,%s", msg.Channel, msg.UserID)
+		r.handleEchoWelcomeCmd(msg)
 	default:
 		return false
 	}
+
 	return true
 }
 
+func (r *Router) isAdmin(msg *config.Message) bool {
+	admins, _ := r.GetStringSlice("Admins")
+
+	for _, ID := range admins {
+		if msg.UserID == ID {
+			return true
+		}
+	}
+	return false
+}
+
+func addTextFromCaptions(msg *config.Message) {
+	for _, f := range msg.Extra["file"] {
+		fi := f.(config.FileInfo)
+
+		msg.Text += fi.Comment
+	}
+}
+
 func (r *Router) replyCmd(msg *config.Message, str string) {
 	srcBridge := r.getBridge(msg.Account)
 
@@ -71,8 +110,20 @@ func (r *Router) replyDM(msg *config.Message, str string) {
 	srcBridge.Send(reply)
 }
 
-func (r *Router) handleOptOutCmd(msg *config.Message, newStaus OptOutStatus) {
-	err := r.setOptOutStatus(msg.UserID, newStaus)
+func (r *Router) sendDM(msg *config.Message, dmChannel string) {
+	srcBridge := r.getBridge(msg.Account)
+
+	msg.Channel = dmChannel
+	msg.Username = ""
+	msg.UserID = ""
+	msg.ID = ""
+	msg.Event = ""
+
+	srcBridge.Send(*msg)
+}
+
+func (r *Router) handleOptOutCmd(msg *config.Message, newStatus OptOutStatus) {
+	err := r.setOptOutStatus(msg.UserID, newStatus)
 
 	reply := "Successfully set message relay preferences."
 	if err != nil {
@@ -81,3 +132,40 @@ func (r *Router) handleOptOutCmd(msg *config.Message, newStaus OptOutStatus) {
 
 	r.replyCmd(msg, reply)
 }
+
+func (r *Router) handleWelcomeCmd(msg *config.Message, welcomeMsg *config.Message) {
+
+	if welcomeMsg != nil {
+		welcomeMsg.Text = strings.Replace(welcomeMsg.Text, "!setwelcome ", "", 1)
+
+		for i, f := range welcomeMsg.Extra["file"] {
+			fi := f.(config.FileInfo)
+			fi.Comment = strings.Replace(fi.Comment, "!setwelcome ", "", 1)
+
+			welcomeMsg.Extra["file"][i] = fi
+		}
+	}
+
+	err := r.setWelcomeMessage(msg.Channel, welcomeMsg)
+
+	reply := "Successfully set welcome message for channel."
+	if welcomeMsg == nil {
+		reply = "Successfully removed welcome message for channel."
+	}
+	if err != nil {
+		reply = "Error setting channel welcome message, try again later or contact the moderators."
+	}
+
+	r.replyCmd(msg, reply)
+}
+
+func (r *Router) handleEchoWelcomeCmd(msg *config.Message) {
+	msg.Event = config.EventWelcomeMsg
+
+	if r.getWelcomeMessage(msg.Channel) == nil {
+		r.replyCmd(msg, "No welcome message configured, set with !setwelcome")
+		return
+	}
+
+	r.handleEventWelcome(msg)
+}

gateway/handlers.go

@@ -49,6 +49,20 @@ func (r *Router) handleEventGetChannelMembers(msg *config.Message) {
 	}
 }
 
+func (r *Router) handleEventWelcome(msg *config.Message) bool {
+	if msg.Event != config.EventWelcomeMsg {
+		return false
+	}
+
+	welcomeMsg := r.getWelcomeMessage(msg.Channel)
+
+	if welcomeMsg != nil {
+		r.sendDM(welcomeMsg, msg.UserID)
+	}
+
+	return true
+}
+
 // handleEventRejoinChannels handles rejoining of channels.
 func (r *Router) handleEventRejoinChannels(msg *config.Message) {
 	if msg.Event != config.EventRejoinChannels {

gateway/router.go

@@ -21,6 +21,7 @@ type Router struct {
 	Message          chan config.Message
 	MattermostPlugin chan config.Message
 	UserStore        gokv.Store
+	ChannelStore     gokv.Store
 
 	logger *logrus.Entry
 }
@@ -101,9 +102,13 @@ func (r *Router) Start() error {
 			}
 		}
 	}
-	userStorePath, exists := r.Config.GetString("UserStorePath")
+	dataStorePath, exists := r.Config.GetString("UserStore")
 	if exists {
-		r.UserStore = r.getUserStore(userStorePath)
+		r.UserStore = r.getUserStore(dataStorePath)
+	}
+	dataStorePath, exists = r.Config.GetString("ChannelStore")
+	if exists {
+		r.ChannelStore = r.getChannelStore(dataStorePath)
 	}
 
 	go r.handleReceive()
@@ -137,14 +142,19 @@ func (r *Router) getBridge(account string) *bridge.Bridge {
 func (r *Router) handleReceive() {
 	for msg := range r.Message {
 		msg := msg // scopelint
-		if r.handleCommand(&msg) {
-			continue
-		}
+
+		skipMsg := false
+		skipMsg = skipMsg || r.handleCommand(&msg)
+		skipMsg = skipMsg || r.handleEventWelcome(&msg)
 		r.handleEventGetChannelMembers(&msg)
 		r.handleEventFailure(&msg)
 		r.handleEventRejoinChannels(&msg)
 		r.handleOptOutUser(&msg)
 
+		if skipMsg {
+			continue
+		}
+
 		// Set message protocol based on the account it came from
 		msg.Protocol = r.getBridge(msg.Account).Protocol