Signs work in 1.19.80

core/src/main/java/org/geysermc/geyser/network/GameProtocol.java

@@ -100,6 +100,10 @@ public final class GameProtocol {
         return session.getUpstream().getProtocolVersion() >= Bedrock_v567.CODEC.getProtocolVersion();
     }
 
+    public static boolean supports1_19_80(GeyserSession session) {
+        return session.getUpstream().getProtocolVersion() >= Bedrock_v582.CODEC.getProtocolVersion();
+    }
+
     /**
      * Gets the {@link PacketCodec} for Minecraft: Java Edition.
      *

core/src/main/java/org/geysermc/geyser/translator/protocol/bedrock/BedrockBlockEntityDataTranslator.java

@@ -30,6 +30,7 @@ import com.github.steveice10.mc.protocol.packet.ingame.serverbound.level.Serverb
 import org.cloudburstmc.math.vector.Vector3i;
 import org.cloudburstmc.nbt.NbtMap;
 import org.cloudburstmc.protocol.bedrock.packet.BlockEntityDataPacket;
+import org.geysermc.geyser.network.GameProtocol;
 import org.geysermc.geyser.session.GeyserSession;
 import org.geysermc.geyser.translator.protocol.PacketTranslator;
 import org.geysermc.geyser.translator.protocol.Translator;
@@ -43,7 +44,14 @@ public class BedrockBlockEntityDataTranslator extends PacketTranslator<BlockEnti
         NbtMap tag = packet.getData();
         String id = tag.getString("id");
         if (id.equals("Sign")) {
-            String text = tag.getString("Text");
+            String text;
+            if (GameProtocol.supports1_19_80(session)) {
+                // The other side is called... you guessed it... BackText
+                text = tag.getCompound("FrontText")
+                        .getString("Text");
+            } else {
+                text = tag.getString("Text");
+            }
             // Note: as of 1.18.30, only one packet is sent from Bedrock when the sign is finished.
             // Previous versions did not have this behavior.
             StringBuilder newMessage = new StringBuilder();

core/src/main/java/org/geysermc/geyser/translator/protocol/java/level/JavaOpenSignEditorTranslator.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.geyser.translator.protocol.java.level;
+
+import com.github.steveice10.mc.protocol.packet.ingame.clientbound.level.ClientboundOpenSignEditorPacket;
+import org.cloudburstmc.protocol.bedrock.packet.OpenSignPacket;
+import org.geysermc.geyser.network.GameProtocol;
+import org.geysermc.geyser.session.GeyserSession;
+import org.geysermc.geyser.translator.protocol.PacketTranslator;
+import org.geysermc.geyser.translator.protocol.Translator;
+
+@Translator(packet = ClientboundOpenSignEditorPacket.class)
+public class JavaOpenSignEditorTranslator extends PacketTranslator<ClientboundOpenSignEditorPacket> {
+
+    @Override
+    public void translate(GeyserSession session, ClientboundOpenSignEditorPacket packet) {
+        if (GameProtocol.supports1_19_80(session)) {
+            OpenSignPacket openSignPacket = new OpenSignPacket();
+            openSignPacket.setPosition(packet.getPosition());
+            openSignPacket.setFrontSide(true); // Will be remedied in 1.20
+            session.sendUpstreamPacket(openSignPacket);
+        }
+    }
+}