move room ID resolution and given alias information to roomInfoTree

Move room ID resolution into roomInfoTree and therefore store given
alias information in RoomInfoTree as well.

main.go

@@ -73,43 +73,15 @@ func main() {
 		fclient.WithTimeout(config.HomeserverVersionInfoTimeout),
 	)
 
-	roomIDSet := make(map[id.RoomID]bool)
-	aliasSetByRoomID := make(map[id.RoomID](map[string]bool))
-	for _, room := range config.Rooms {
-		// Check, if given room is an alias and try to resolve it into a room id.
-		if strings.HasPrefix(room, "#") {
-			resolvedAlias, err := client.ResolveAlias(context.Background(), id.RoomAlias(room))
-			if err != nil {
-				log.Fatal(err)
-			}
-
-			roomIDSet[resolvedAlias.RoomID] = true
-
-			aliasSet, ok := aliasSetByRoomID[resolvedAlias.RoomID]
-			if !ok {
-				aliasSet = make(map[string]bool)
-				aliasSetByRoomID[resolvedAlias.RoomID] = aliasSet
-			}
-			aliasSet[room] = true
-		} else {
-			roomIDSet[id.RoomID(room)] = true
-		}
-	}
-
-	roomIDs := make([]id.RoomID, 0, len(roomIDSet))
-	for roomID := range roomIDSet {
-		roomIDs = append(roomIDs, roomID)
-	}
-
-	roomInfoTree := roominfotree.Get(roomIDs, client, federationClient)
+	roomInfoTree := roominfotree.Get(config.Rooms, client, federationClient)
 
 	for roomID, roomInfo := range roomInfoTree {
 		fmt.Println("Room:")
 		fmt.Printf("  %s -> %d\n", roomID, roomInfo.MemberCount)
-		aliasSet, ok := aliasSetByRoomID[roomID]
-		if ok {
+		aliases := roomInfo.GivenAliases
+		if len(aliases) > 0 {
 			fmt.Println("Given Aliases:")
-			for alias := range aliasSet {
+			for _, alias := range aliases {
 				fmt.Printf("  %s\n", alias)
 			}
 		}