PatchworkMC · TheGlitch76 · Aug 18, 2020 · Jun 6, 2020 · Jun 10, 2020 · Jun 11, 2020
diff --git a/patchwork-fake-players/build.gradle b/patchwork-fake-players/build.gradle
@@ -0,0 +1,6 @@
+archivesBaseName = "patchwork-fake-players"
+version = getSubprojectVersion(project, "0.1.0")
+
+dependencies {
+	implementation project(path: ':patchwork-api-base', configuration: 'dev')
+}
diff --git a/patchwork-fake-players/src/main/java/net/minecraftforge/common/util/FakePlayer.java b/patchwork-fake-players/src/main/java/net/minecraftforge/common/util/FakePlayer.java
@@ -0,0 +1,81 @@
+/*
+ * Minecraft Forge, Patchwork Project
+ * Copyright (c) 2016-2020, 2019-2020
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.common.util;
+
+import com.mojang.authlib.GameProfile;
+
+import net.minecraft.entity.damage.DamageSource;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.network.packet.c2s.play.ClientSettingsC2SPacket;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.network.ServerPlayerInteractionManager;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.stat.Stat;
+import net.minecraft.text.Text;
+import net.minecraft.util.math.Vec3d;
+
+// Preliminary, simple Fake Player class
+public class FakePlayer extends ServerPlayerEntity {
+	public FakePlayer(ServerWorld world, GameProfile profile) {
+		super(world.getServer(), world, profile, new ServerPlayerInteractionManager(world));
+	}
+
+	@Override
+	public Vec3d getPosVector() {
+		return new Vec3d(0, 0, 0);
+	}
+
+	@Override
+	public void addChatMessage(Text text, boolean actionBar) {
+	}
+
+	@Override
+	public void sendMessage(Text component) {
+	}
+
+	@Override
+	public void increaseStat(Stat stat, int num) {
+	}
+
+	@Override
+	public boolean isInvulnerableTo(DamageSource source) {
+		return true;
+	}
+
+	@Override
+	public boolean shouldDamagePlayer(PlayerEntity player) {
+		return false;
+	}
+
+	@Override
+	public void onDeath(DamageSource source) {
+	}
+
+	@Override
+	public void tick() {
+	}
+
+	@Override
+	public void setClientSettings(ClientSettingsC2SPacket packet) {
+	}
+
+	// Forge also has this here:
+	// @Override @Nullable public MinecraftServer getServer() { return ServerLifecycleHooks.getCurrentServer(); }
+}
diff --git a/patchwork-fake-players/src/main/java/net/minecraftforge/common/util/FakePlayerFactory.java b/patchwork-fake-players/src/main/java/net/minecraftforge/common/util/FakePlayerFactory.java
@@ -0,0 +1,70 @@
+/*
+ * Minecraft Forge, Patchwork Project
+ * Copyright (c) 2016-2020, 2019-2020
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.minecraftforge.common.util;
+
+import java.lang.ref.WeakReference;
+import java.util.Map;
+import java.util.UUID;
+
+import com.google.common.collect.Maps;
+import com.mojang.authlib.GameProfile;
+
+import net.minecraft.server.world.ServerWorld;
+
+public class FakePlayerFactory {
+	private static final GameProfile MINECRAFT = new GameProfile(UUID.fromString("41C82C87-7AfB-4024-BA57-13D2C99CAE77"), "[Minecraft]");
+	// Map of all active fake player profiles to their entities
+	private static final Map<GameProfile, FakePlayer> fakePlayers = Maps.newHashMap();
+	private static WeakReference<FakePlayer> MINECRAFT_PLAYER = null;
+
+	public static FakePlayer getMinecraft(ServerWorld world) {
+		FakePlayer ret = MINECRAFT_PLAYER != null ? MINECRAFT_PLAYER.get() : null;
+
+		if (ret == null) {
+			ret = FakePlayerFactory.get(world, MINECRAFT);
+			MINECRAFT_PLAYER = new WeakReference<>(ret);
+		}
+
+		return ret;
+	}
+
+	/**
+	 * Get a fake player with a given profile.
+	 * Mods should either hold weak references to the return value, or listen for a
+	 * WorldEvent.Unload and kill all references to prevent worlds staying in memory.
+	 */
+	public static FakePlayer get(ServerWorld world, GameProfile profile) {
+		return fakePlayers.computeIfAbsent(profile, it -> new FakePlayer(world, it));
+	}
+
+	/**
+	 * Used internally to clean up fake players when worlds are unloaded on server stop.
+	 */
+	public static void unloadWorld(ServerWorld world) {
+		fakePlayers.entrySet().removeIf(entry -> entry.getValue().world == world);
+
+		// This shouldn't be strictly necessary, but let's be aggressive.
+		FakePlayer mc = MINECRAFT_PLAYER != null ? MINECRAFT_PLAYER.get() : null;
+
+		if (mc != null && mc.world == world) {
+			MINECRAFT_PLAYER = null;
+		}
+	}
+}
diff --git a/...ork-fake-players/src/main/java/net/patchworkmc/impl/fakeplayers/PatchworkFakePlayers.java b/...ork-fake-players/src/main/java/net/patchworkmc/impl/fakeplayers/PatchworkFakePlayers.java
@@ -0,0 +1,38 @@
+/*
+ * Minecraft Forge, Patchwork Project
+ * Copyright (c) 2016-2020, 2019-2020
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.patchworkmc.impl.fakeplayers;
+
+import net.minecraftforge.common.util.FakePlayerFactory;
+
+import net.minecraft.server.world.ServerWorld;
+
+import net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents;
+import net.fabricmc.api.ModInitializer;
+
+public class PatchworkFakePlayers implements ModInitializer {
+	@Override
+	public void onInitialize() {
+		ServerLifecycleEvents.SERVER_STOPPED.register(server -> {
+			for (ServerWorld world : server.getWorlds()) {
+				FakePlayerFactory.unloadWorld(world);
+			}
+		});
+	}
+}
diff --git a/...layers/src/main/java/net/patchworkmc/mixin/fakeplayers/MixinPlayerAdvancementTracker.java b/...layers/src/main/java/net/patchworkmc/mixin/fakeplayers/MixinPlayerAdvancementTracker.java
@@ -0,0 +1,44 @@
+/*
+ * Minecraft Forge, Patchwork Project
+ * Copyright (c) 2016-2020, 2019-2020
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation version 2.1
+ * of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+package net.patchworkmc.mixin.fakeplayers;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+import net.minecraftforge.common.util.FakePlayer;
+
+import net.minecraft.advancement.Advancement;
+import net.minecraft.advancement.PlayerAdvancementTracker;
+import net.minecraft.server.network.ServerPlayerEntity;
+
+@Mixin(PlayerAdvancementTracker.class)
+public class MixinPlayerAdvancementTracker {
+	@Shadow
+	private ServerPlayerEntity owner;
+
+	@Inject(method = "grantCriterion", at = @At("HEAD"), cancellable = true)
+	private void onGrantCriterion(Advancement advancement, String criterion, CallbackInfoReturnable<Boolean> cir) {
+		if (owner instanceof FakePlayer) {
+			cir.setReturnValue(false);
+		}
+	}
+}
diff --git a/patchwork-fake-players/src/main/resources/assets/patchwork-extensions/icon.png b/patchwork-fake-players/src/main/resources/assets/patchwork-extensions/icon.png
diff --git a/patchwork-fake-players/src/main/resources/fabric.mod.json b/patchwork-fake-players/src/main/resources/fabric.mod.json
@@ -0,0 +1,29 @@
+{
+  "schemaVersion": 1,
+  "id": "patchwork-fake-players",
+  "version": "${version}",
+  "name": "Patchwork Fake Players",
+  "description": "Implements the Minecraft Forge fake players API",
+  "authors": [
+    "PatchworkMC"
+  ],
+  "license": "LGPL-2.1-only",
+  "icon": "assets/patchwork-fake-players/icon.png",
+  "environment": "*",
+  "depends": {
+    "patchwork-api-base": "*",
+    "fabric": "*"
+  },
+  "mixins": [
+    "patchwork-fake-players.mixins.json"
+  ],
+  "entrypoints": {
+    "main": [
+      "net.patchworkmc.impl.fakeplayers.PatchworkFakePlayers"
+    ]
+  },
+  "custom": {
+    "modmenu:api": true,
+    "modmenu:parent": "patchwork"
+  }
+}
diff --git a/patchwork-fake-players/src/main/resources/patchwork-extensions.mixins.json b/patchwork-fake-players/src/main/resources/patchwork-extensions.mixins.json
@@ -0,0 +1,11 @@
+{
+  "required": true,
+  "package": "net.patchworkmc.mixin.fakeplayers",
+  "compatibilityLevel": "JAVA_8",
+  "mixins": [
+    "MixinPlayerAdvancementTracker",
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}
diff --git a/settings.gradle b/settings.gradle
@@ -27,6 +27,7 @@ include 'patchwork-extensions'
 include 'patchwork-extensions-block'
 include 'patchwork-extensions-item'
 include 'patchwork-extensions-shearing'
+include 'patchwork-fake-players'
 include 'patchwork-fml'
 include 'patchwork-god-classes'
 include 'patchwork-gui'