Initial bot functionality

* The bot now properly joins the management room
* The management room is persisted in the database
* Welcome/help messages are sent in the management room

bridge/puppet.go

@@ -0,0 +1,87 @@
+package bridge
+
+import (
+	"fmt"
+	"regexp"
+
+	log "maunium.net/go/maulogger/v2"
+	"maunium.net/go/mautrix/id"
+
+	"gitlab.com/beeper/discord/database"
+)
+
+type Puppet struct {
+	*database.Puppet
+
+	bridge *Bridge
+	log    log.Logger
+
+	MXID id.UserID
+}
+
+var userIDRegex *regexp.Regexp
+
+func (b *Bridge) NewPuppet(dbPuppet *database.Puppet) *Puppet {
+	return &Puppet{
+		Puppet: dbPuppet,
+		bridge: b,
+		log:    b.log.Sub(fmt.Sprintf("Puppet/%s", dbPuppet.ID)),
+
+		MXID: b.FormatPuppetMXID(dbPuppet.ID),
+	}
+}
+
+func (b *Bridge) ParsePuppetMXID(mxid id.UserID) (string, bool) {
+	if userIDRegex == nil {
+		pattern := fmt.Sprintf(
+			"^@%s:%s$",
+			b.config.Bridge.FormatUsername("([0-9]+)"),
+			b.config.Homeserver.Domain,
+		)
+
+		userIDRegex = regexp.MustCompile(pattern)
+	}
+
+	match := userIDRegex.FindStringSubmatch(string(mxid))
+	if len(match) == 2 {
+		return match[1], true
+	}
+
+	return "", false
+}
+
+func (b *Bridge) GetPuppetByMXID(mxid id.UserID) *Puppet {
+	id, ok := b.ParsePuppetMXID(mxid)
+	if !ok {
+		return nil
+	}
+
+	return b.GetPuppetByID(id)
+}
+
+func (b *Bridge) GetPuppetByID(id string) *Puppet {
+	b.puppetsLock.Lock()
+	defer b.puppetsLock.Unlock()
+
+	puppet, ok := b.puppets[id]
+	if !ok {
+		dbPuppet := b.db.Puppet.Get(id)
+		if dbPuppet == nil {
+			dbPuppet = b.db.Puppet.New()
+			dbPuppet.ID = id
+			dbPuppet.Insert()
+		}
+
+		puppet = b.NewPuppet(dbPuppet)
+		b.puppets[puppet.ID] = puppet
+	}
+
+	return puppet
+}
+
+func (b *Bridge) FormatPuppetMXID(did string) id.UserID {
+	return id.NewUserID(
+		b.config.Bridge.FormatUsername(did),
+		b.config.Homeserver.Domain,
+	)
+}