show banlist by day, in weekly chunks

bot/command_admin.go

@@ -7,6 +7,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"time"
 
 	"gitlab.com/etke.cc/go/secgen"
 	"maunium.net/go/mautrix/id"
@@ -302,9 +303,7 @@ func (b *Bot) runBanlist(ctx context.Context, commandSlice []string) {
 			msg.WriteString(cfg.Get(config.BotBanlistEnabled))
 			msg.WriteString("`, total: ")
 			msg.WriteString(strconv.Itoa(size))
-			msg.WriteString(" hosts (`")
-			msg.WriteString(strings.Join(banlist.Slice(), "`, `"))
-			msg.WriteString("`)\n\n")
+			msg.WriteString("\n\n")
 		}
 		if !cfg.BanlistEnabled() {
 			msg.WriteString("To enable banlist, send `")
@@ -314,9 +313,11 @@ func (b *Bot) runBanlist(ctx context.Context, commandSlice []string) {
 		msg.WriteString("To ban somebody: `")
 		msg.WriteString(b.prefix)
 		msg.WriteString(" banlist:add IP1 IP2 IP3...`")
-		msg.WriteString("where each ip is IPv4 or IPv6\n")
+		msg.WriteString("where each ip is IPv4 or IPv6\n\n")
+		msg.WriteString("You can find current banlist values below:\n")
 
 		b.SendNotice(ctx, evt.RoomID, msg.String())
+		b.addBanlistTimeline(ctx)
 		return
 	}
 	value := utils.SanitizeBoolString(commandSlice[1])
@@ -444,6 +445,38 @@ func (b *Bot) runBanlistRemove(ctx context.Context, commandSlice []string) {
 	b.SendNotice(ctx, evt.RoomID, "banlist has been updated, kupo")
 }
 
+func (b *Bot) addBanlistTimeline(ctx context.Context) {
+	evt := eventFromContext(ctx)
+	banlist := b.cfg.GetBanlist()
+	timeline := map[string][]string{}
+	for ip, ts := range banlist {
+		key := "???"
+		date, _ := time.ParseInLocation(time.RFC1123Z, ts, time.UTC) //nolint:errcheck // stored in that format
+		if !date.IsZero() {
+			key = date.Truncate(24 * time.Hour).Format(time.DateOnly)
+		}
+		if _, ok := timeline[key]; !ok {
+			timeline[key] = []string{}
+		}
+		timeline[key] = append(timeline[key], ip)
+	}
+	keys := utils.MapKeys(timeline)
+
+	for _, chunk := range utils.Chunks(keys, 7) {
+		var txt strings.Builder
+		for _, day := range chunk {
+			data := timeline[day]
+			sort.Strings(data)
+			txt.WriteString("* `")
+			txt.WriteString(day)
+			txt.WriteString("` `")
+			txt.WriteString(strings.Join(data, "`, `"))
+			txt.WriteString("`\n")
+		}
+		b.SendNotice(ctx, evt.RoomID, txt.String())
+	}
+}
+
 func (b *Bot) runBanlistReset(ctx context.Context) {
 	evt := eventFromContext(ctx)
 	if !b.cfg.GetBot().BanlistEnabled() {

utils/utils.go

@@ -134,3 +134,23 @@ func StringSlice(str string) []string {
 func SanitizeStringSlice(str string) string {
 	return SliceString(StringSlice(str))
 }
+
+// MapKeys returns sorted keys of the map
+func MapKeys[V any](data map[string]V) []string {
+	keys := make([]string, 0, len(data))
+	for k := range data {
+		keys = append(keys, k)
+	}
+	sort.Strings(keys)
+	return keys
+}
+
+// Chunks divides slice by chunks with specified size
+func Chunks[T any](slice []T, chunkSize int) [][]T {
+	chunks := make([][]T, 0, (len(slice)+chunkSize-1)/chunkSize)
+
+	for chunkSize < len(slice) {
+		slice, chunks = slice[chunkSize:], append(chunks, slice[0:chunkSize:chunkSize])
+	}
+	return append(chunks, slice)
+}