fix: resolve version parsing issues on older versions of JM

(bug reported via discord)

Author: funniray

common/src/main/java/com/funniray/minimap/common/jm/JMHandler.java

@@ -145,9 +145,18 @@ public void handleAdminSave(MinimapPlayer player, byte[] message, String replyCh
 
     public void handleVersion(MinimapPlayer player, byte[] message, String replyChannel) {
         modernList.put(player.getUniqueId(), message.length > 0 && message[0] != 0);
-        ByteArrayDataInput in = ByteStreams.newDataInput(message);
         Gson gson = new Gson();
-        String payload = gson.toJson(new JMVersion());
+        JMVersion serverVersion = new JMVersion();
+        ByteArrayDataInput in = ByteStreams.newDataInput(message);
+        if (!modern(player)) in.readByte();
+
+        String sent = NetworkUtils.readUtf(in);
+        JMVersion clientVersion = gson.fromJson(sent, JMVersion.class);
+        if (clientVersion.journeymap_version.major <= 5) {
+            serverVersion.journeymap_version = new JMVersion.VersionDetails(6,0,0,null);
+        }
+
+        String payload = gson.toJson(serverVersion);
         ByteArrayDataOutput out = ByteStreams.newDataOutput();
         if (!modern(player)) out.writeByte(0);
         NetworkUtils.writeUtf(payload, out);

common/src/main/java/com/funniray/minimap/common/jm/data/JMVersion.java

@@ -9,13 +9,21 @@ public class JMVersion {
     public String minecraft_version = JavaMinimapPlugin.getInstance().getServer().getMinecraftVersion().toString();
 
     public static class VersionDetails {
-        public String full;
-        public int major = 6;
-        public int minor = 1;
-        public int micro = 0;
-        public String patch = "-beta";
+        public final String full;
+        public final int major;
+        public final int minor;
+        public final int micro;
+        public final String patch;
 
         public VersionDetails() {
+            this(6,1,0,"-beta99");
+        }
+
+        public VersionDetails(int major, int minor, int micro, String patch) {
+            this.major = major;
+            this.minor = minor;
+            this.micro = micro;
+            this.patch = patch;
             this.full = String.format("%d.%d.%d%s",major,minor,micro,patch);
         }
     }