Reduce session server lookups (#509)

* fix: add default skin to gameprofiles

* fix: add signatures by default to prevent issues

* cleanup

* no longer apply empty textures

* revert formatting change

* fix(spigot): linked player textures

* fix(velocity): linked player textures

* fix(bungeecord): apply linked textures

* Made the MojangUtils class instance based, removed some unneeded code

* Don't block Velocity event threads, made the Bungee variant work

* Add some comments

---------

Co-authored-by: bridge <haha@haha.com>
Co-authored-by: Tim203 <mctim203@gmail.com>

core/src/main/java/org/geysermc/floodgate/skin/SkinDataImpl.java

@@ -29,8 +29,14 @@ import com.google.gson.JsonObject;
 import java.util.Objects;
 import org.checkerframework.checker.nullness.qual.NonNull;
 import org.geysermc.floodgate.api.event.skin.SkinApplyEvent.SkinData;
+import org.geysermc.floodgate.util.Constants;
 
 public class SkinDataImpl implements SkinData {
+    public static final SkinData DEFAULT_SKIN = new SkinDataImpl(
+            Constants.DEFAULT_MINECRAFT_JAVA_SKIN_TEXTURE,
+            Constants.DEFAULT_MINECRAFT_JAVA_SKIN_SIGNATURE
+    );
+
     private final String value;
     private final String signature;
 

core/src/main/java/org/geysermc/floodgate/util/MojangUtils.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2019-2024 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/Floodgate
+ */
+
+package org.geysermc.floodgate.util;
+
+import com.google.common.cache.Cache;
+import com.google.common.cache.CacheBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.inject.Inject;
+import com.google.inject.Singleton;
+import com.google.inject.name.Named;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+import lombok.NonNull;
+import org.geysermc.floodgate.api.event.skin.SkinApplyEvent.SkinData;
+import org.geysermc.floodgate.skin.SkinDataImpl;
+import org.geysermc.floodgate.util.HttpClient.HttpResponse;
+
+@Singleton
+public class MojangUtils {
+    private final Cache<UUID, SkinData> SKIN_CACHE = CacheBuilder.newBuilder()
+            .expireAfterWrite(5, TimeUnit.MINUTES)
+            .maximumSize(500)
+            .build();
+
+    @Inject private HttpClient httpClient;
+    @Inject
+    @Named("commonPool")
+    private ExecutorService commonPool;
+
+    public CompletableFuture<@NonNull SkinData> skinFor(UUID playerId) {
+        return CompletableFuture.supplyAsync(() -> {
+            try {
+                return SKIN_CACHE.get(playerId, () -> fetchSkinFor(playerId));
+            } catch (ExecutionException exception) {
+                throw new RuntimeException(exception.getCause());
+            }
+        }, commonPool);
+    }
+
+    private @NonNull SkinData fetchSkinFor(UUID playerId) {
+        HttpResponse<JsonObject> httpResponse = httpClient.get(
+                String.format(Constants.PROFILE_WITH_PROPERTIES_URL, playerId.toString()));
+
+        if (httpResponse.getHttpCode() != 200) {
+            return SkinDataImpl.DEFAULT_SKIN;
+        }
+
+        JsonObject response = httpResponse.getResponse();
+
+        if (response == null) {
+            return SkinDataImpl.DEFAULT_SKIN;
+        }
+
+        JsonArray properties = response.getAsJsonArray("properties");
+
+        if (properties.size() == 0) {
+            return SkinDataImpl.DEFAULT_SKIN;
+        }
+
+        for (JsonElement property : properties) {
+            if (!property.isJsonObject()) {
+                continue;
+            }
+
+            JsonObject propertyObject = property.getAsJsonObject();
+
+            if (!propertyObject.has("name")
+                    || !propertyObject.has("value")
+                    || !propertyObject.has("signature")
+                    || !propertyObject.get("name").getAsString().equals("textures")) {
+                continue;
+            }
+
+            return new SkinDataImpl(
+                    propertyObject.get("value").getAsString(),
+                    propertyObject.get("signature").getAsString()
+            );
+        }
+
+        return SkinDataImpl.DEFAULT_SKIN;
+    }
+}

core/src/main/templates/org/geysermc/floodgate/util/Constants.java

@@ -56,6 +56,9 @@ public final class Constants {
     public static final String LATEST_VERSION_URL =
             "https://download.geysermc.org/v2/projects/%s/versions/latest/builds/latest";
 
+    public static final String PROFILE_WITH_PROPERTIES_URL =
+            "https://sessionserver.mojang.com/session/minecraft/profile/%s?unsigned=false";
+
 
     public static final String NTP_SERVER = "time.cloudflare.com";
     public static final String INTERNAL_ERROR_MESSAGE =
@@ -70,4 +73,7 @@ public final class Constants {
     public static final int HANDSHAKE_PACKET_ID = 0;
     public static final int LOGIN_SUCCESS_PACKET_ID = 2;
     public static final int SET_COMPRESSION_PACKET_ID = 3;
+
+    public static final String DEFAULT_MINECRAFT_JAVA_SKIN_TEXTURE = "ewogICJ0aW1lc3RhbXAiIDogMTcxNTcxNzM1NTI2MywKICAicHJvZmlsZUlkIiA6ICIyMWUzNjdkNzI1Y2Y0ZTNiYjI2OTJjNGEzMDBhNGRlYiIsCiAgInByb2ZpbGVOYW1lIiA6ICJHZXlzZXJNQyIsCiAgInNpZ25hdHVyZVJlcXVpcmVkIiA6IHRydWUsCiAgInRleHR1cmVzIiA6IHsKICAgICJTS0lOIiA6IHsKICAgICAgInVybCIgOiAiaHR0cDovL3RleHR1cmVzLm1pbmVjcmFmdC5uZXQvdGV4dHVyZS8zMWY0NzdlYjFhN2JlZWU2MzFjMmNhNjRkMDZmOGY2OGZhOTNhMzM4NmQwNDQ1MmFiMjdmNDNhY2RmMWI2MGNiIgogICAgfQogIH0KfQ";
+    public static final String DEFAULT_MINECRAFT_JAVA_SKIN_SIGNATURE = "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";
 }