fix: harden channel rights and sticker compatibility

Co-authored-by: HSgram <3013954224@qq.com>

internal/domain/channel_banned_rights.go

@@ -0,0 +1,109 @@
+package domain
+
+import "strings"
+
+// ChannelBannedRightsBlockMessage reports whether a non-admin channel member is
+// blocked by fine-grained chatBannedRights for this concrete message payload.
+func ChannelBannedRightsBlockMessage(req SendChannelMessageRequest, channel Channel, member ChannelMember, selfBoostsApplied int) bool {
+	if req.Action != nil || channelBannedRightsBypassed(channel, member) {
+		return false
+	}
+	if req.Media.IsZero() {
+		if strings.TrimSpace(req.Message) == "" {
+			return false
+		}
+		return channelBannedRightsBlockWithBoost(channel, member.BannedRights.SendPlain, channel.DefaultBannedRights.SendPlain, selfBoostsApplied)
+	}
+	return ChannelBannedRightsBlockMedia(channel, member, req.Media, selfBoostsApplied)
+}
+
+// ChannelBannedRightsBlockMedia applies both legacy send_media and modern
+// per-media banned rights to one message media payload.
+func ChannelBannedRightsBlockMedia(channel Channel, member ChannelMember, media *MessageMedia, selfBoostsApplied int) bool {
+	if media.IsZero() || channelBannedRightsBypassed(channel, member) {
+		return false
+	}
+	return channelBannedRightsBlockWithBoost(
+		channel,
+		channelBannedRightsBlockMediaKind(member.BannedRights, media),
+		channelBannedRightsBlockMediaKind(channel.DefaultBannedRights, media),
+		selfBoostsApplied,
+	)
+}
+
+// ChannelBannedRightsBlockReactions applies send_reactions. Empty reaction
+// vectors are handled by callers as removals and should remain allowed.
+func ChannelBannedRightsBlockReactions(channel Channel, member ChannelMember, selfBoostsApplied int) bool {
+	if channelBannedRightsBypassed(channel, member) {
+		return false
+	}
+	return channelBannedRightsBlockWithBoost(channel, member.BannedRights.SendReactions, channel.DefaultBannedRights.SendReactions, selfBoostsApplied)
+}
+
+// ChannelBannedRightsBlockManageTopics applies manage_topics to topic create,
+// edit, and closed-topic reply bypasses.
+func ChannelBannedRightsBlockManageTopics(channel Channel, member ChannelMember, selfBoostsApplied int) bool {
+	if channelBannedRightsBypassed(channel, member) {
+		return false
+	}
+	return channelBannedRightsBlockWithBoost(channel, member.BannedRights.ManageTopics, channel.DefaultBannedRights.ManageTopics, selfBoostsApplied)
+}
+
+func channelBannedRightsBypassed(channel Channel, member ChannelMember) bool {
+	return channel.Broadcast || member.Role == ChannelRoleCreator || member.Role == ChannelRoleAdmin
+}
+
+func channelBannedRightsBlockWithBoost(channel Channel, memberBlocked, defaultBlocked bool, selfBoostsApplied int) bool {
+	if memberBlocked {
+		return true
+	}
+	if !defaultBlocked {
+		return false
+	}
+	return channel.BoostsUnrestrict == 0 || selfBoostsApplied < channel.BoostsUnrestrict
+}
+
+func channelBannedRightsBlockMediaKind(rights ChannelBannedRights, media *MessageMedia) bool {
+	if rights.SendMedia {
+		return true
+	}
+	switch media.Kind {
+	case MessageMediaKindPhoto:
+		return rights.SendPhotos
+	case MessageMediaKindDocument:
+		return channelBannedRightsBlockDocument(rights, media)
+	case MessageMediaKindPoll:
+		return rights.SendPolls
+	case MessageMediaKindDice:
+		return rights.SendGames
+	case MessageMediaKindWebPage:
+		return rights.EmbedLinks
+	default:
+		return rights.SendMedia
+	}
+}
+
+func channelBannedRightsBlockDocument(rights ChannelBannedRights, media *MessageMedia) bool {
+	if media == nil || media.Document == nil {
+		return rights.SendDocs
+	}
+	if media.Document.IsSticker() {
+		return rights.SendStickers
+	}
+	if media.Document.IsGif() {
+		return rights.SendGifs
+	}
+	if media.Round {
+		return rights.SendRoundvideos
+	}
+	if media.Voice {
+		return rights.SendVoices
+	}
+	if media.Video {
+		return rights.SendVideos
+	}
+	if media.IsMusic() {
+		return rights.SendAudios
+	}
+	return rights.SendDocs
+}