add bedrock server support

src/main/java/cc.fascinated/common/packet/MinecraftBedrockPacket.java

@@ -0,0 +1,23 @@
+package cc.fascinated.common.packet;
+
+import lombok.NonNull;
+
+import java.io.IOException;
+import java.net.DatagramSocket;
+
+/**
+ * Represents a packet in the
+ * Minecraft Bedrock protocol.
+ *
+ * @author Braydon
+ * @see <a href="https://wiki.vg/Raknet_Protocol">Protocol Docs</a>
+ */
+public interface MinecraftBedrockPacket {
+    /**
+     * Process this packet.
+     *
+     * @param socket the socket to process the packet for
+     * @throws IOException if an I/O error occurs
+     */
+    void process(@NonNull DatagramSocket socket) throws IOException;
+}

src/main/java/cc.fascinated/common/packet/impl/bedrock/BedrockPacketUnconnectedPing.java

@@ -0,0 +1,42 @@
+package cc.fascinated.common.packet.impl.bedrock;
+
+import cc.fascinated.common.packet.MinecraftBedrockPacket;
+import lombok.NonNull;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+/**
+ * This packet is sent by the client to the server to
+ * request a pong response from the server. The server
+ * will respond with a string containing the server's status.
+ *
+ * @author Braydon
+ * @see <a href="https://wiki.vg/Raknet_Protocol#Unconnected_Ping">Protocol Docs</a>
+ */
+public final class BedrockPacketUnconnectedPing implements MinecraftBedrockPacket {
+    private static final byte ID = 0x01; // The ID of the packet
+    private static final byte[] MAGIC = { 0, -1, -1, 0, -2, -2, -2, -2, -3, -3, -3, -3, 18, 52, 86, 120 };
+
+    /**
+     * Process this packet.
+     *
+     * @param socket the socket to process the packet for
+     * @throws IOException if an I/O error occurs
+     */
+    @Override
+    public void process(@NonNull DatagramSocket socket) throws IOException {
+        // Construct the packet buffer
+        ByteBuffer buffer = ByteBuffer.allocate(33).order(ByteOrder.LITTLE_ENDIAN);;
+        buffer.put(ID); // Packet ID
+        buffer.putLong(System.currentTimeMillis()); // Timestamp
+        buffer.put(MAGIC); // Magic
+        buffer.putLong(0L); // Client GUID
+
+        // Send the packet
+        socket.send(new DatagramPacket(buffer.array(), 0, buffer.limit()));
+    }
+}

src/main/java/cc.fascinated/common/packet/impl/bedrock/BedrockPacketUnconnectedPong.java

@@ -0,0 +1,62 @@
+package cc.fascinated.common.packet.impl.bedrock;
+
+import cc.fascinated.common.packet.MinecraftBedrockPacket;
+import cc.fascinated.model.server.BedrockMinecraftServer;
+import lombok.Getter;
+import lombok.NonNull;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * This packet is sent by the server to the client in
+ * response to the {@link BedrockPacketUnconnectedPing}.
+ *
+ * @author Braydon
+ * @see <a href="https://wiki.vg/Raknet_Protocol#Unconnected_Pong">Protocol Docs</a>
+ */
+@Getter
+public final class BedrockPacketUnconnectedPong implements MinecraftBedrockPacket {
+    private static final byte ID = 0x1C; // The ID of the packet
+
+    /**
+     * The response from the server, null if none.
+     */
+    private String response;
+
+    /**
+     * Process this packet.
+     *
+     * @param socket the socket to process the packet for
+     * @throws IOException if an I/O error occurs
+     */
+    @Override
+    public void process(@NonNull DatagramSocket socket) throws IOException {
+        // Handle receiving of the packet
+        byte[] receiveData = new byte[2048];
+        DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
+        socket.receive(receivePacket);
+
+        // Construct a buffer from the received packet
+        ByteBuffer buffer = ByteBuffer.wrap(receivePacket.getData()).order(ByteOrder.LITTLE_ENDIAN);
+        byte id = buffer.get(); // The received packet id
+        if (id == ID) {
+            String response = new String(buffer.array(), StandardCharsets.UTF_8).trim(); // Extract the response
+
+            // Trim the length of the response (short) from the
+            // start of the string, which begins with the edition name
+            for (BedrockMinecraftServer.Edition edition : BedrockMinecraftServer.Edition.values()) {
+                int startIndex = response.indexOf(edition.name());
+                if (startIndex != -1) {
+                    response = response.substring(startIndex);
+                    break;
+                }
+            }
+            this.response = response;
+        }
+    }
+}