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/matrix.go

@@ -5,6 +5,7 @@ import (
 	"maunium.net/go/mautrix"
 	"maunium.net/go/mautrix/appservice"
 	"maunium.net/go/mautrix/event"
+	"maunium.net/go/mautrix/format"
 	"maunium.net/go/mautrix/id"
 )
 
@@ -60,16 +61,92 @@ func (mh *matrixHandler) ignoreEvent(evt *event.Event) bool {
 }
 
 func (mh *matrixHandler) handleMessage(evt *event.Event) {
+	mh.log.Debugfln("received message from %q: %q", evt.Sender, evt.Content.AsMessage())
 	if mh.ignoreEvent(evt) {
 		return
 	}
 
-	mh.log.Debugfln("received message from %q: %q", evt.Sender, evt.Content.AsMessage())
+}
+
+func (mh *matrixHandler) joinAndCheckMembers(evt *event.Event, intent *appservice.IntentAPI) *mautrix.RespJoinedMembers {
+	resp, err := intent.JoinRoomByID(evt.RoomID)
+	if err != nil {
+		mh.log.Debugfln("Failed to join room %q as %q with invite from %q: %v", evt.RoomID, intent.UserID, evt.Sender, err)
+
+		return nil
+	}
+
+	members, err := intent.JoinedMembers(resp.RoomID)
+	if err != nil {
+		mh.log.Debugfln("Failed to get members in room %q with invite from %q as %q: %v", resp.RoomID, evt.Sender, intent.UserID, err)
+
+		return nil
+	}
+
+	if len(members.Joined) < 2 {
+		mh.log.Debugfln("Leaving empty room %q with invite from %q as %q", resp.RoomID, evt.Sender, intent.UserID)
+
+		intent.LeaveRoom(resp.RoomID)
+
+		return nil
+	}
+
+	return members
+}
+
+func (mh *matrixHandler) sendNoticeWithmarkdown(roomID id.RoomID, message string) (*mautrix.RespSendEvent, error) {
+	intent := mh.as.BotIntent()
+	content := format.RenderMarkdown(message, true, false)
+	content.MsgType = event.MsgNotice
+
+	return intent.SendMessageEvent(roomID, event.EventMessage, content)
+}
+
+func (mh *matrixHandler) handleBotInvite(evt *event.Event) {
+	intent := mh.as.BotIntent()
+
+	user := mh.bridge.GetUserByMXID(evt.Sender)
+	if user == nil {
+		return
+	}
+
+	members := mh.joinAndCheckMembers(evt, intent)
+	if members == nil {
+		return
+	}
+
+	// If this is a DM and the user doesn't have a management room, make this
+	// the management room.
+	if len(members.Joined) == 2 && (user.ManagementRoom == "" || evt.Content.AsMember().IsDirect) {
+		user.SetManagementRoom(evt.RoomID)
+
+		intent.SendNotice(user.ManagementRoom, "This room has been registered as your bridge management/status room")
+		mh.log.Debugfln("%q registered as management room with %q", evt.RoomID, evt.Sender)
+	}
+
+	// Wait to send the welcome message until we're sure we're not in an empty
+	// room.
+	mh.sendNoticeWithmarkdown(evt.RoomID, mh.bridge.config.Bridge.ManagementRoomText.Welcome)
+
+	if evt.RoomID == user.ManagementRoom {
+		if user.HasSession() {
+			mh.sendNoticeWithmarkdown(evt.RoomID, mh.bridge.config.Bridge.ManagementRoomText.Connected)
+		} else {
+			mh.sendNoticeWithmarkdown(evt.RoomID, mh.bridge.config.Bridge.ManagementRoomText.NotConnected)
+		}
+
+		additionalHelp := mh.bridge.config.Bridge.ManagementRoomText.AdditionalHelp
+		if additionalHelp != "" {
+			mh.sendNoticeWithmarkdown(evt.RoomID, additionalHelp)
+		}
+	}
+}
+
+func (mh *matrixHandler) handlePuppetInvite(evt *event.Event, inviter *User, puppet *Puppet) {
+	mh.log.Warnln("handling puppet invite!")
 }
 
 func (mh *matrixHandler) handleMembership(evt *event.Event) {
-	mh.log.Debugfln("recevied invite %#v\n", evt)
-
 	// Return early if we're supposed to ignore the event.
 	if mh.ignoreEvent(evt) {
 		return
@@ -78,12 +155,37 @@ func (mh *matrixHandler) handleMembership(evt *event.Event) {
 	// Grab the content of the event.
 	content := evt.Content.AsMember()
 
-	// TODO: handle invites from ourselfs?
+	// Check if this is a new conversation from a matrix user to the bot
+	if content.Membership == event.MembershipInvite && id.UserID(evt.GetStateKey()) == mh.as.BotMXID() {
+		mh.handleBotInvite(evt)
+
+		return
+	}
+
+	// Load or create a new user.
+	user := mh.bridge.GetUserByMXID(evt.Sender)
+	if user == nil {
+		return
+	}
+
+	// Load or create a new portal.
+	portal := mh.bridge.GetPortalByMXID(evt.RoomID)
+	if portal == nil {
+		puppet := mh.bridge.GetPuppetByMXID(id.UserID(evt.GetStateKey()))
+
+		if content.Membership == event.MembershipInvite && puppet != nil {
+			mh.handlePuppetInvite(evt, user, puppet)
+		}
+
+		mh.log.Warnln("no existing portal for", evt.RoomID)
+
+		return
+	}
 
 	isSelf := id.UserID(evt.GetStateKey()) == evt.Sender
 
 	// Handle matrix invites.
 	if content.Membership == event.MembershipInvite && !isSelf {
-		//
+		portal.HandleMatrixInvite(user, evt)
 	}
 }