Add an ID cache (discord). Fixes #1106 (#1111)

When a webhook "edits" a message, it does this by deleting the message
and creating a new one with the new content.

On creation of this new message, we'll get another ID then already is
know by the gateway in its id cache. So we add it in our own cache and
replace it whenever we want to edit/delete it again.

bridge/discord/discord.go

@@ -34,6 +34,8 @@ type Bdiscord struct {
 	membersMutex  sync.RWMutex
 	userMemberMap map[string]*discordgo.Member
 	nickMemberMap map[string]*discordgo.Member
+	webhookCache  map[string]string
+	webhookMutex  sync.RWMutex
 }
 
 func New(cfg *bridge.Config) bridge.Bridger {
@@ -41,6 +43,7 @@ func New(cfg *bridge.Config) bridge.Bridger {
 	b.userMemberMap = make(map[string]*discordgo.Member)
 	b.nickMemberMap = make(map[string]*discordgo.Member)
 	b.channelInfoMap = make(map[string]*config.ChannelInfo)
+	b.webhookCache = make(map[string]string)
 	if b.GetString("WebhookURL") != "" {
 		b.Log.Debug("Configuring Discord Incoming Webhook")
 		b.webhookID, b.webhookToken = b.splitURL(b.GetString("WebhookURL"))
@@ -188,6 +191,8 @@ func (b *Bdiscord) JoinChannel(channel config.ChannelInfo) error {
 func (b *Bdiscord) Send(msg config.Message) (string, error) {
 	b.Log.Debugf("=> Receiving %#v", msg)
 
+	origMsgID := msg.ID
+
 	channelID := b.getChannelID(msg.Channel)
 	if channelID == "" {
 		return "", fmt.Errorf("Could not find channelID for %v", msg.Channel)
@@ -230,6 +235,7 @@ func (b *Bdiscord) Send(msg config.Message) (string, error) {
 
 		// If we are editing a message, delete the old message
 		if msg.ID != "" {
+			msg.ID = b.getCacheID(msg.ID)
 			b.Log.Debugf("Deleting edited webhook message")
 			err := b.c.ChannelMessageDelete(channelID, msg.ID)
 			if err != nil {
@@ -273,6 +279,8 @@ func (b *Bdiscord) Send(msg config.Message) (string, error) {
 		if msg == nil {
 			return "", nil
 		}
+
+		b.updateCacheID(origMsgID, msg.ID)
 		return msg.ID, nil
 	}
 
@@ -283,6 +291,7 @@ func (b *Bdiscord) Send(msg config.Message) (string, error) {
 		if msg.ID == "" {
 			return "", nil
 		}
+		msg.ID = b.getCacheID(msg.ID)
 		err := b.c.ChannelMessageDelete(channelID, msg.ID)
 		return "", err
 	}

bridge/discord/helpers.go

@@ -208,6 +208,40 @@ func (b *Bdiscord) splitURL(url string) (string, string) {
 	return webhookURLSplit[webhookIdxID], webhookURLSplit[webhookIdxToken]
 }
 
+// getcacheID tries to find a corresponding msgID in the webhook cache.
+// if not found returns the original request.
+func (b *Bdiscord) getCacheID(msgID string) string {
+	b.webhookMutex.RLock()
+	defer b.webhookMutex.RUnlock()
+	for k, v := range b.webhookCache {
+		if msgID == k {
+			return v
+		}
+	}
+	return msgID
+}
+
+// updateCacheID updates the cache so that the newID takes the place of
+// the original ID. This is used for edit/deletes in combination with webhooks
+// as editing a message via webhook means deleting the message and creating a
+// new message (with a new ID). This ID needs to be set instead of the original ID
+func (b *Bdiscord) updateCacheID(origID, newID string) {
+	b.webhookMutex.Lock()
+	match := false
+	for k, v := range b.webhookCache {
+		if v == origID {
+			delete(b.webhookCache, k)
+			b.webhookCache[origID] = newID
+			match = true
+			continue
+		}
+	}
+	if !match && origID != "" {
+		b.webhookCache[origID] = newID
+	}
+	b.webhookMutex.Unlock()
+}
+
 func enumerateUsernames(s string) []string {
 	onlySpace := true
 	for _, r := range s {