Add PlayerSignCommandPreprocessEvent

paper-api/src/main/java/io/papermc/paper/event/player/PlayerSignCommandPreprocessEvent.java

@@ -0,0 +1,47 @@
+package io.papermc.paper.event.player;
+
+import java.util.Set;
+import org.bukkit.block.Sign;
+import org.bukkit.block.sign.Side;
+import org.bukkit.entity.Player;
+import org.bukkit.event.player.PlayerCommandPreprocessEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Called when a {@link Player} clicks a side on a sign that causes a command to run.
+ * <p>
+ * This command is run with elevated permissions which allows players to access commands on signs they wouldn't
+ * normally be able to run.
+ */
+@NullMarked
+public class PlayerSignCommandPreprocessEvent extends PlayerCommandPreprocessEvent {
+
+    private final Sign sign;
+    private final Side side;
+
+    @ApiStatus.Internal
+    public PlayerSignCommandPreprocessEvent(final Player player, final String message, final Set<Player> recipients, final Sign sign, final Side side) {
+        super(player, message, recipients);
+        this.sign = sign;
+        this.side = side;
+    }
+
+    /**
+     * Gets the sign that the command originated from.
+     *
+     * @return the sign
+     */
+    public Sign getSign() {
+        return this.sign;
+    }
+
+    /**
+     * Gets the side of the sign that the command originated from.
+     *
+     * @return the sign side
+     */
+    public Side getSide() {
+        return this.side;
+    }
+}