PaperMC/nms-patches/PersistentRaid.patch

--- a/net/minecraft/server/PersistentRaid.java
+++ b/net/minecraft/server/PersistentRaid.java
@@ -92,19 +92,33 @@
                 boolean flag = false;
 
                 if (!raid.isStarted()) {
+                    /* CraftBukkit - moved down
                     if (!this.raids.containsKey(raid.getId())) {
                         this.raids.put(raid.getId(), raid);
                     }
+                    */
 
                     flag = true;
-                } else if (raid.getBadOmenLevel() < raid.getMaxBadOmenLevel()) {
+                    // CraftBukkit start - fixed a bug with raid: players could add up Bad Omen level even when the raid had finished
+                } else if (raid.isInProgress() && raid.getBadOmenLevel() < raid.getMaxBadOmenLevel()) {
                     flag = true;
+                    // CraftBukkit end
                 } else {
                     entityplayer.removeEffect(MobEffects.BAD_OMEN);
                     entityplayer.playerConnection.sendPacket(new PacketPlayOutEntityStatus(entityplayer, (byte) 43));
                 }
 
                 if (flag) {
+                    // CraftBukkit start
+                    if (!org.bukkit.craftbukkit.event.CraftEventFactory.callRaidTriggerEvent(raid, entityplayer)) {
+                        entityplayer.removeEffect(MobEffects.BAD_OMEN);
+                        return null;
+                    }
+
+                    if (!this.raids.containsKey(raid.getId())) {
+                        this.raids.put(raid.getId(), raid);
+                    }
+                    // CraftBukkit end
                     raid.a((EntityHuman) entityplayer);
                     entityplayer.playerConnection.sendPacket(new PacketPlayOutEntityStatus(entityplayer, (byte) 43));
                     if (!raid.c()) {