PaperMC/paper-server/patches/sources/net/minecraft/world/item/FishingRodItem.java.patch

--- a/net/minecraft/world/item/FishingRodItem.java
+++ b/net/minecraft/world/item/FishingRodItem.java
@@ -24,7 +_,7 @@
         ItemStack itemInHand = player.getItemInHand(hand);
         if (player.fishing != null) {
             if (!level.isClientSide) {
-                int i = player.fishing.retrieve(itemInHand);
+                int i = player.fishing.retrieve(hand, itemInHand); // Paper - Add hand parameter to PlayerFishEvent
                 itemInHand.hurtAndBreak(i, player, LivingEntity.getSlotForHand(hand));
             }
 
@@ -40,20 +_,31 @@
             );
             player.gameEvent(GameEvent.ITEM_INTERACT_FINISH);
         } else {
-            level.playSound(
-                null,
-                player.getX(),
-                player.getY(),
-                player.getZ(),
-                SoundEvents.FISHING_BOBBER_THROW,
-                SoundSource.NEUTRAL,
-                0.5F,
-                0.4F / (level.getRandom().nextFloat() * 0.4F + 0.8F)
-            );
+            // CraftBukkit - moved down
             if (level instanceof ServerLevel serverLevel) {
                 int i1 = (int)(EnchantmentHelper.getFishingTimeReduction(serverLevel, itemInHand, player) * 20.0F);
                 int fishingLuckBonus = EnchantmentHelper.getFishingLuckBonus(serverLevel, itemInHand, player);
-                Projectile.spawnProjectile(new FishingHook(player, level, fishingLuckBonus, i1), serverLevel, itemInHand);
+                // CraftBukkit start
+                FishingHook fishingHook = new FishingHook(player, level, fishingLuckBonus, i1);
+                org.bukkit.event.player.PlayerFishEvent playerFishEvent = new org.bukkit.event.player.PlayerFishEvent((org.bukkit.entity.Player) player.getBukkitEntity(), null, (org.bukkit.entity.FishHook) fishingHook.getBukkitEntity(), org.bukkit.craftbukkit.CraftEquipmentSlot.getHand(hand), org.bukkit.event.player.PlayerFishEvent.State.FISHING);
+                level.getCraftServer().getPluginManager().callEvent(playerFishEvent);
+
+                if (playerFishEvent.isCancelled()) {
+                    player.fishing = null;
+                    return InteractionResult.PASS;
+                }
+                level.playSound(
+                    null,
+                    player.getX(),
+                    player.getY(),
+                    player.getZ(),
+                    SoundEvents.FISHING_BOBBER_THROW,
+                    SoundSource.NEUTRAL,
+                    0.5F,
+                    0.4F / (level.getRandom().nextFloat() * 0.4F + 0.8F)
+                );
+                Projectile.spawnProjectile(fishingHook, serverLevel, itemInHand);
+                // CraftBukkit end
             }
 
             player.awardStat(Stats.ITEM_USED.get(this));