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Use a leading-edge debounce for bans #19

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Use a leading-edge debounce for bans #19

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12 changes: 12 additions & 0 deletions src/main/java/org/enginehub/discord/util/PunishmentUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@

package org.enginehub.discord.util;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import net.dv8tion.jda.api.entities.Guild;
import net.dv8tion.jda.api.entities.Member;
import net.dv8tion.jda.api.entities.User;
Expand All @@ -30,6 +32,12 @@

public final class PunishmentUtil {

private record BanKey(long guildId, long userId) { }

private static final Cache<BanKey, Boolean> RECENT_BANS = CacheBuilder.newBuilder()
.expireAfterAccess(1, TimeUnit.MINUTES)
.build();

private static String getContactString() {
return "Submit an appeal via https://ehub.to/ban-appeal if you wish to appeal.";
}
Expand All @@ -44,6 +52,10 @@ public static void kickUser(Guild guild, Member member, String reason) {
}

public static void banUser(Guild guild, User user, String reason, boolean eraseHistory) {
if (RECENT_BANS.asMap().putIfAbsent(new BanKey(guild.getIdLong(), user.getIdLong()), Boolean.TRUE) != null) {
return;
}

var _ = user.openPrivateChannel().submit()
.thenCompose(privateChannel ->
privateChannel.sendMessage("You have been banned for `" + reason + "`. " + getContactString())
Expand Down