Added RawSkins, Toppings and renamed the Floodgate plugin name

bootstrap/bungeecord/src/main/java/org/geysermc/platform/bungeecord/GeyserBungeeConfiguration.java

@@ -44,7 +44,7 @@ public class GeyserBungeeConfiguration extends GeyserJacksonConfiguration {
     private Path floodgateKey;
 
     public void loadFloodgate(GeyserBungeePlugin plugin, Configuration configuration) {
-        Plugin floodgate = plugin.getProxy().getPluginManager().getPlugin("floodgate-bungee");
+        Plugin floodgate = plugin.getProxy().getPluginManager().getPlugin("floodgate");
         floodgateKey = FloodgateKeyLoader.getKey(plugin.getGeyserLogger(), this, Paths.get(plugin.getDataFolder().toString(), configuration.getString("floodgate-key-file"), "public-key.pem"), floodgate, floodgate != null ? floodgate.getDataFolder().toPath() : null);
     }
 

bootstrap/bungeecord/src/main/java/org/geysermc/platform/bungeecord/GeyserBungeePlugin.java

@@ -94,7 +94,7 @@ public class GeyserBungeePlugin extends Plugin implements GeyserBootstrap {
         this.geyserLogger = new GeyserBungeeLogger(getLogger(), geyserConfig.isDebugMode());
         GeyserConfiguration.checkGeyserConfiguration(geyserConfig, geyserLogger);
 
-        if (geyserConfig.getRemote().getAuthType().equals("floodgate") && getProxy().getPluginManager().getPlugin("floodgate-bungee") == null) {
+        if (geyserConfig.getRemote().getAuthType().equals("floodgate") && getProxy().getPluginManager().getPlugin("floodgate") == null) {
             geyserLogger.severe(LanguageUtils.getLocaleStringLog("geyser.bootstrap.floodgate.not_installed") + " " + LanguageUtils.getLocaleStringLog("geyser.bootstrap.floodgate.disabling"));
             return;
         }

bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/GeyserSpigotConfiguration.java

@@ -48,7 +48,7 @@ public class GeyserSpigotConfiguration extends GeyserJacksonConfiguration {
     private Path floodgateKey;
 
     public void loadFloodgate(GeyserSpigotPlugin plugin) {
-        Plugin floodgate = Bukkit.getPluginManager().getPlugin("floodgate-spigot");
+        Plugin floodgate = Bukkit.getPluginManager().getPlugin("floodgate");
         floodgateKey = FloodgateKeyLoader.getKey(plugin.getGeyserLogger(), this, Paths.get(plugin.getDataFolder().toString(), plugin.getConfig().getString("floodgate-key-file", "public-key.pem")), floodgate, floodgate != null ? floodgate.getDataFolder().toPath() : null);
     }
 

bootstrap/spigot/src/main/java/org/geysermc/platform/spigot/GeyserSpigotPlugin.java

@@ -93,7 +93,7 @@ public class GeyserSpigotPlugin extends JavaPlugin implements GeyserBootstrap {
         this.geyserLogger = new GeyserSpigotLogger(getLogger(), geyserConfig.isDebugMode());
         GeyserConfiguration.checkGeyserConfiguration(geyserConfig, geyserLogger);
 
-        if (geyserConfig.getRemote().getAuthType().equals("floodgate") && Bukkit.getPluginManager().getPlugin("floodgate-spigot") == null) {
+        if (geyserConfig.getRemote().getAuthType().equals("floodgate") && Bukkit.getPluginManager().getPlugin("floodgate") == null) {
             geyserLogger.severe(LanguageUtils.getLocaleStringLog("geyser.bootstrap.floodgate.not_installed") + " " + LanguageUtils.getLocaleStringLog("geyser.bootstrap.floodgate.disabling"));
             this.getPluginLoader().disablePlugin(this);
             return;

common/src/main/java/org/geysermc/floodgate/crypto/AesCipher.java

@@ -26,7 +26,7 @@
 
 package org.geysermc.floodgate.crypto;
 
-import org.geysermc.floodgate.util.InvalidHeaderException;
+import lombok.RequiredArgsConstructor;
 
 import javax.crypto.Cipher;
 import javax.crypto.SecretKey;
@@ -35,12 +35,14 @@ import java.nio.ByteBuffer;
 import java.security.Key;
 import java.security.SecureRandom;
 
+@RequiredArgsConstructor
 public final class AesCipher implements FloodgateCipher {
-    private static final int IV_LENGTH = 12;
+    public static final int IV_LENGTH = 12;
     private static final int TAG_BIT_LENGTH = 128;
     private static final String CIPHER_NAME = "AES/GCM/NoPadding";
 
     private final SecureRandom secureRandom = new SecureRandom();
+    private final Topping topping;
     private SecretKey secretKey;
 
     public void init(Key key) {
@@ -62,32 +64,57 @@ public final class AesCipher implements FloodgateCipher {
         cipher.init(Cipher.ENCRYPT_MODE, secretKey, spec);
         byte[] cipherText = cipher.doFinal(data);
 
-        return ByteBuffer.allocate(iv.length + cipherText.length + HEADER_LENGTH)
-                .put(IDENTIFIER).put(VERSION) // header
+        if (topping != null) {
+            iv = topping.encode(iv);
+            cipherText = topping.encode(cipherText);
+        }
+
+        return ByteBuffer.allocate(iv.length + cipherText.length + HEADER_LENGTH + 1)
+                .put(IDENTIFIER) // header
                 .put(iv)
+                .put((byte) 0x21)
                 .put(cipherText)
                 .array();
     }
 
     public byte[] decrypt(byte[] cipherTextWithIv) throws Exception {
-        HeaderResult pair = checkHeader(cipherTextWithIv);
-        if (pair.getVersion() != VERSION) {
-            throw new InvalidHeaderException(
-                    "Expected version " + VERSION + ", got " + pair.getVersion()
-            );
-        }
+        checkHeader(cipherTextWithIv);
 
         Cipher cipher = Cipher.getInstance(CIPHER_NAME);
 
         int bufferLength = cipherTextWithIv.length - HEADER_LENGTH;
         ByteBuffer buffer = ByteBuffer.wrap(cipherTextWithIv, HEADER_LENGTH, bufferLength);
 
-        byte[] iv = new byte[IV_LENGTH];
+        int ivLength = IV_LENGTH;
+
+        if (topping != null) {
+            int mark = buffer.position();
+
+            // we need the first index, the second is for the optional RawSkin
+            boolean found = false;
+            while (buffer.hasRemaining() && !found) {
+                if (buffer.get() == 0x21) {
+                    found = true;
+                }
+            }
+
+            ivLength = buffer.position() - mark - 1; // don't include the splitter itself
+            buffer.position(mark); // reset to the pre-while index
+        }
+
+        byte[] iv = new byte[ivLength];
         buffer.get(iv);
 
+        buffer.position(buffer.position() + 1); // skip splitter
+
         byte[] cipherText = new byte[buffer.remaining()];
         buffer.get(cipherText);
 
+        if (topping != null) {
+            iv = topping.decode(iv);
+            cipherText = topping.decode(cipherText);
+        }
+
         GCMParameterSpec spec = new GCMParameterSpec(TAG_BIT_LENGTH, iv);
         cipher.init(Cipher.DECRYPT_MODE, secretKey, spec);
         return cipher.doFinal(cipherText);

common/src/main/java/org/geysermc/floodgate/crypto/Base64Topping.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2019-2020 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.floodgate.crypto;
+
+import java.util.Base64;
+
+public final class Base64Topping implements Topping {
+    @Override
+    public byte[] encode(byte[] data) {
+        return Base64.getEncoder().encode(data);
+    }
+
+    @Override
+    public byte[] decode(byte[] data) {
+        return Base64.getDecoder().decode(data);
+    }
+}

common/src/main/java/org/geysermc/floodgate/crypto/FloodgateCipher.java

@@ -28,7 +28,7 @@ package org.geysermc.floodgate.crypto;
 
 import lombok.AllArgsConstructor;
 import lombok.Data;
-import org.geysermc.floodgate.util.InvalidHeaderException;
+import org.geysermc.floodgate.util.InvalidFormatException;
 
 import java.nio.charset.StandardCharsets;
 import java.security.Key;
@@ -38,9 +38,7 @@ import java.security.Key;
  */
 public interface FloodgateCipher {
     byte[] IDENTIFIER = "Floodgate".getBytes(StandardCharsets.UTF_8);
-    byte VERSION = 2;
-
-    int HEADER_LENGTH = IDENTIFIER.length + 1; // one byte for version
+    int HEADER_LENGTH = IDENTIFIER.length;
 
     /**
      * Initializes the instance by giving it the key it needs to encrypt or decrypt data
@@ -110,19 +108,20 @@ public interface FloodgateCipher {
     }
 
     /**
-     * Checks if the header is valid and return a IntPair containing the header version
-     * and the index to start reading the actual encrypted data from.
+     * Checks if the header is valid.
+     * This method will throw an InvalidFormatException when the header is invalid.
      *
      * @param data the data to check
-     * @return IntPair. x = version number, y = the index to start reading from.
-     * @throws InvalidHeaderException when the header is invalid
+     * @throws InvalidFormatException when the header is invalid
      */
-    default HeaderResult checkHeader(byte[] data) throws InvalidHeaderException {
+    default void checkHeader(byte[] data) throws InvalidFormatException {
         final int identifierLength = IDENTIFIER.length;
 
         if (data.length <= HEADER_LENGTH) {
-            throw new InvalidHeaderException("Data length is smaller then header." +
-                    "Needed " + HEADER_LENGTH + ", got " + data.length);
+            throw new InvalidFormatException("Data length is smaller then header." +
+                    "Needed " + HEADER_LENGTH + ", got " + data.length,
+                    true
+            );
         }
 
         for (int i = 0; i < identifierLength; i++) {
@@ -132,15 +131,15 @@ public interface FloodgateCipher {
                     receivedIdentifier.append(b);
                 }
 
-                throw new InvalidHeaderException(String.format(
-                        "Expected identifier %s, got %s",
+                throw new InvalidFormatException(
+                        String.format("Expected identifier %s, got %s",
                                 new String(IDENTIFIER, StandardCharsets.UTF_8),
                                 receivedIdentifier.toString()
-                ));
+                        ),
+                        true
+                );
             }
         }
-
-        return new HeaderResult(data[identifierLength], HEADER_LENGTH);
     }
 
     static boolean hasHeader(String data) {

common/src/main/java/org/geysermc/floodgate/crypto/Topping.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2019-2020 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.floodgate.crypto;
+
+public interface Topping {
+    byte[] encode(byte[] data);
+    byte[] decode(byte[] data);
+}

common/src/main/java/org/geysermc/floodgate/util/BedrockData.java

@@ -50,25 +50,23 @@ public final class BedrockData {
     private final LinkedPlayer linkedPlayer;
     private final int dataLength;
 
-    private RawSkin skin;
-
     public BedrockData(String version, String username, String xuid, int deviceOs,
                        String languageCode, int uiProfile, int inputMode, String ip,
-                       LinkedPlayer linkedPlayer, RawSkin skin) {
+                       LinkedPlayer linkedPlayer) {
         this(version, username, xuid, deviceOs, languageCode,
-                inputMode, uiProfile, ip, linkedPlayer, EXPECTED_LENGTH, skin);
+                inputMode, uiProfile, ip, linkedPlayer, EXPECTED_LENGTH);
     }
 
     public BedrockData(String version, String username, String xuid, int deviceOs,
-                       String languageCode, int uiProfile, int inputMode, String ip, RawSkin skin) {
-        this(version, username, xuid, deviceOs, languageCode, uiProfile, inputMode, ip, null, skin);
+                       String languageCode, int uiProfile, int inputMode, String ip) {
+        this(version, username, xuid, deviceOs, languageCode, uiProfile, inputMode, ip, null);
     }
 
     public boolean hasPlayerLink() {
         return linkedPlayer != null;
     }
 
-    public static BedrockData fromString(String data, String skin) {
+    public static BedrockData fromString(String data) {
         String[] split = data.split("\0");
         if (split.length != EXPECTED_LENGTH) {
             return emptyData(split.length);
@@ -79,14 +77,10 @@ public final class BedrockData {
         return new BedrockData(
                 split[0], split[1], split[2], Integer.parseInt(split[3]), split[4],
                 Integer.parseInt(split[5]), Integer.parseInt(split[6]), split[7],
-                linkedPlayer, split.length, RawSkin.parse(skin)
+                linkedPlayer, split.length
         );
     }
 
-    public static BedrockData fromRawData(byte[] data, String skin) {
-        return fromString(new String(data), skin);
-    }
-
     @Override
     public String toString() {
         // The format is the same as the order of the fields in this class
@@ -96,6 +90,6 @@ public final class BedrockData {
     }
 
     private static BedrockData emptyData(int dataLength) {
-        return new BedrockData(null, null, null, -1, null, -1, -1, null, null, dataLength, null);
+        return new BedrockData(null, null, null, -1, null, -1, -1, null, null, dataLength);
     }
 }

common/src/main/java/org/geysermc/floodgate/util/InvalidFormatException.java

@@ -26,16 +26,26 @@
 
 package org.geysermc.floodgate.util;
 
-public class InvalidHeaderException extends Exception {
-    public InvalidHeaderException() {
+import lombok.Getter;
+
+@Getter
+public class InvalidFormatException extends Exception {
+    private boolean header = false;
+
+    public InvalidFormatException() {
         super();
     }
 
-    public InvalidHeaderException(String message) {
+    public InvalidFormatException(String message) {
         super(message);
     }
 
-    public InvalidHeaderException(String message, Throwable cause) {
+    public InvalidFormatException(String message, boolean header) {
+        super(message);
+        this.header = header;
+    }
+
+    public InvalidFormatException(String message, Throwable cause) {
         super(message, cause);
     }
 }

common/src/main/java/org/geysermc/floodgate/util/RawSkin.java

@@ -26,31 +26,62 @@
 package org.geysermc.floodgate.util;
 
 import lombok.AllArgsConstructor;
+import lombok.ToString;
 
-import java.nio.charset.StandardCharsets;
+import java.nio.ByteBuffer;
+import java.util.Base64;
 
 @AllArgsConstructor
-public class RawSkin {
+@ToString
+public final class RawSkin {
     public int width;
     public int height;
     public byte[] data;
 
     private RawSkin() {}
 
-    public static RawSkin parse(String data) {
-        if (data == null) return null;
-        String[] split = data.split(":");
-        if (split.length != 3) return null;
+    public static RawSkin decode(byte[] data) throws InvalidFormatException {
+        if (data == null) {
+            return null;
+        }
+
+        int maxEncodedLength = 4 * (((64 * 64 * 4 + 8) + 2) / 3);
+        // if the RawSkin is longer then the max Java Edition skin length
+        if (data.length > maxEncodedLength) {
+            throw new InvalidFormatException(
+                    "Encoded data cannot be longer then " + maxEncodedLength + " bytes!"
+            );
+        }
+
+        // if the encoded data doesn't even contain the width and height (8 bytes, 2 ints)
+        if (data.length < 4 * ((8 + 2) / 3)) {
+            throw new InvalidFormatException("Encoded data must be at least 12 bytes long!");
+        }
+
+        data = Base64.getDecoder().decode(data);
+
+        ByteBuffer buffer = ByteBuffer.wrap(data);
 
         RawSkin skin = new RawSkin();
-        skin.width = Integer.parseInt(split[0]);
-        skin.height = Integer.parseInt(split[1]);
-        skin.data = split[2].getBytes(StandardCharsets.UTF_8);
+        skin.width = buffer.getInt();
+        skin.height = buffer.getInt();
+        if (buffer.remaining() != (skin.width * skin.height * 4)) {
+            throw new InvalidFormatException(String.format(
+                    "Expected skin length to be %s, got %s",
+                    (skin.width * skin.height * 4), buffer.remaining()
+            ));
+        }
+        skin.data = new byte[buffer.remaining()];
+        buffer.get(skin.data);
         return skin;
     }
 
-    @Override
-    public String toString() {
-        return Integer.toString(width) + ':' + height + ':' + new String(data);
+    public byte[] encode() {
+        // 2 x int = 8 bytes
+        ByteBuffer buffer = ByteBuffer.allocate(8 + data.length);
+        buffer.putInt(width);
+        buffer.putInt(height);
+        buffer.put(data);
+        return Base64.getEncoder().encode(buffer.array());
     }
 }

connector/src/main/java/org/geysermc/connector/GeyserConnector.java

@@ -57,6 +57,7 @@ import org.geysermc.connector.utils.LanguageUtils;
 import org.geysermc.connector.utils.LocaleUtils;
 import org.geysermc.floodgate.crypto.AesCipher;
 import org.geysermc.floodgate.crypto.AesKeyProducer;
+import org.geysermc.floodgate.crypto.Base64Topping;
 import org.geysermc.floodgate.crypto.FloodgateCipher;
 
 import javax.naming.directory.Attribute;
@@ -180,7 +181,7 @@ public class GeyserConnector {
         if (authType == AuthType.FLOODGATE) {
             try {
                 Key key = new AesKeyProducer().produceFrom(config.getFloodgateKeyFile());
-                cipher = new AesCipher();
+                cipher = new AesCipher(new Base64Topping());
                 cipher.init(key);
                 logger.info(LanguageUtils.getLocaleStringLog("geyser.auth.floodgate.loaded_key"));
             } catch (Exception exception) {

connector/src/main/java/org/geysermc/connector/network/session/GeyserSession.java

@@ -77,15 +77,8 @@ import org.geysermc.floodgate.crypto.FloodgateCipher;
 import org.geysermc.floodgate.util.BedrockData;
 
 import java.net.InetSocketAddress;
-import java.security.NoSuchAlgorithmException;
-import java.security.PublicKey;
-import java.security.spec.InvalidKeySpecException;
-import java.util.*;
 import java.nio.charset.StandardCharsets;
-import java.util.ArrayList;
-import java.util.Base64;
-import java.util.List;
-import java.util.UUID;
+import java.util.*;
 import java.util.concurrent.atomic.AtomicInteger;
 
 @Getter
@@ -359,8 +352,7 @@ public class GeyserSession implements CommandSender {
                                         clientData.getLanguageCode(),
                                         clientData.getUiProfile().ordinal(),
                                         clientData.getCurrentInputMode().ordinal(),
-                                        upstream.getSession().getAddress().getAddress().getHostAddress(),
-                                        clientData.getImage("Skin")
+                                        upstream.getSession().getAddress().getAddress().getHostAddress()
                                 ).toString());
                             } catch (Exception e) {
                                 connector.getLogger().error(LanguageUtils.getLocaleStringLog("geyser.auth.floodgate.encrypt_fail"), e);
@@ -368,15 +360,18 @@ public class GeyserSession implements CommandSender {
                                 return;
                             }
 
-                            String encrypted = new String(
-                                    Base64.getEncoder().encode(encryptedData),
-                                    StandardCharsets.UTF_8
-                            );
+                            byte[] rawSkin = clientData.getAndTransformImage("Skin").encode();
+                            byte[] finalData = new byte[encryptedData.length + rawSkin.length + 1];
+                            System.arraycopy(encryptedData, 0, finalData, 0, encryptedData.length);
+                            finalData[encryptedData.length] = 0x21; // splitter
+                            System.arraycopy(rawSkin, 0, finalData, encryptedData.length + 1, rawSkin.length);
+
+                            String finalDataString = new String(finalData, StandardCharsets.UTF_8);
 
                             HandshakePacket handshakePacket = event.getPacket();
                             event.setPacket(new HandshakePacket(
                                     handshakePacket.getProtocolVersion(),
-                                    handshakePacket.getHostname() + '\0' + encrypted,
+                                    handshakePacket.getHostname() + '\0' + finalDataString,
                                     handshakePacket.getPort(),
                                     handshakePacket.getIntent()
                             ));

connector/src/main/java/org/geysermc/connector/network/session/auth/BedrockClientData.java

@@ -28,13 +28,15 @@ package org.geysermc.connector.network.session.auth;
 import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.JsonNode;
 import lombok.Getter;
-import net.minidev.json.JSONObject;
+import org.geysermc.connector.utils.SkinProvider;
 import org.geysermc.floodgate.util.DeviceOs;
 import org.geysermc.floodgate.util.InputMode;
 import org.geysermc.floodgate.util.RawSkin;
 import org.geysermc.floodgate.util.UiProfile;
 
+import java.awt.image.BufferedImage;
 import java.util.Base64;
 import java.util.UUID;
 
@@ -42,7 +44,7 @@ import java.util.UUID;
 @Getter
 public final class BedrockClientData {
     @JsonIgnore
-    private JSONObject jsonData;
+    private JsonNode jsonData;
 
     @JsonProperty(value = "GameVersion")
     private String gameVersion;
@@ -112,31 +114,17 @@ public final class BedrockClientData {
     @JsonProperty(value = "ThirdPartyNameOnly")
     private boolean thirdPartyNameOnly;
 
-    public void setJsonData(JSONObject data) {
-        if (this.jsonData != null && data != null) {
+    public void setJsonData(JsonNode data) {
+        if (this.jsonData == null && data != null) {
             this.jsonData = data;
         }
     }
 
-    /**
-     * Taken from https://github.com/NukkitX/Nukkit/blob/master/src/main/java/cn/nukkit/network/protocol/LoginPacket.java<br>
-     * Internally only used for Skins, but can be used for Capes too
-     */
-    public RawSkin getImage(String name) {
-        if (jsonData == null || !jsonData.containsKey(name + "Data")) return null;
-        byte[] image = Base64.getDecoder().decode(jsonData.getAsString(name + "Data"));
-        if (jsonData.containsKey(name + "ImageWidth") && jsonData.containsKey(name + "ImageHeight")) {
-            return new RawSkin(
-                    (int) jsonData.getAsNumber(name + "ImageWidth"),
-                    (int) jsonData.get(name + "ImageHeight"),
-                    image
-            );
-        }
-        return getLegacyImage(image);
+    private static RawSkin getLegacyImage(byte[] imageData) {
+        if (imageData == null) {
+            return null;
         }
 
-    private static RawSkin getLegacyImage(byte[] imageData) {
-        if (imageData == null) return null;
         // width * height * 4 (rgba)
         switch (imageData.length) {
             case 8192:
@@ -151,4 +139,44 @@ public final class BedrockClientData {
                 throw new IllegalArgumentException("Unknown legacy skin size");
         }
     }
+
+    /**
+     * Taken from https://github.com/NukkitX/Nukkit/blob/master/src/main/java/cn/nukkit/network/protocol/LoginPacket.java<br>
+     * Internally only used for Skins, but can be used for Capes too
+     */
+    public RawSkin getImage(String name) {
+        System.out.println(jsonData.toString());
+        if (jsonData == null || !jsonData.has(name + "Data")) {
+            return null;
+        }
+
+        byte[] image = Base64.getDecoder().decode(jsonData.get(name + "Data").asText());
+        if (jsonData.has(name + "ImageWidth") && jsonData.has(name + "ImageHeight")) {
+            return new RawSkin(
+                    jsonData.get(name + "ImageWidth").asInt(),
+                    jsonData.get(name + "ImageHeight").asInt(),
+                    image
+            );
+        }
+        return getLegacyImage(image);
+    }
+
+    public RawSkin getAndTransformImage(String name) {
+        RawSkin skin = getImage(name);
+        if (skin != null && (skin.width > 64 || skin.height > 64)) {
+            BufferedImage scaledImage = SkinProvider.imageDataToBufferedImage(skin.data, skin.width, skin.height);
+
+            int max = Math.max(skin.width, skin.height);
+            while (max > 64) {
+                max /= 2;
+                scaledImage = SkinProvider.scale(scaledImage);
+            }
+
+            byte[] skinData = SkinProvider.bufferedImageToImageData(scaledImage);
+            skin.width = scaledImage.getWidth();
+            skin.height = scaledImage.getHeight();
+            skin.data = skinData;
+        }
+        return skin;
+    }
 }

connector/src/main/java/org/geysermc/connector/utils/LoginEncryptionUtils.java

@@ -131,8 +131,9 @@ public class LoginEncryptionUtils {
             JWSObject clientJwt = JWSObject.parse(clientData);
             EncryptionUtils.verifyJwt(clientJwt, identityPublicKey);
 
-            BedrockClientData data = JSON_MAPPER.convertValue(JSON_MAPPER.readTree(clientJwt.getPayload().toBytes()), BedrockClientData.class);
-            data.setJsonData(clientJwt.getPayload().toJSONObject());
+            JsonNode clientDataJson = JSON_MAPPER.readTree(clientJwt.getPayload().toBytes());
+            BedrockClientData data = JSON_MAPPER.convertValue(clientDataJson, BedrockClientData.class);
+            data.setJsonData(clientDataJson);
             session.setClientData(data);
 
             if (EncryptionUtils.canUseEncryption()) {

connector/src/main/java/org/geysermc/connector/utils/SkinProvider.java

@@ -460,7 +460,7 @@ public class SkinProvider {
         return null;
     }
 
-    private static BufferedImage scale(BufferedImage bufferedImage) {
+    public static BufferedImage scale(BufferedImage bufferedImage) {
         BufferedImage resized = new BufferedImage(bufferedImage.getWidth() / 2, bufferedImage.getHeight() / 2, BufferedImage.TYPE_INT_ARGB);
         Graphics2D g2 = resized.createGraphics();
         g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);