Host a Minecraft - Forge Dedicated Server

# Update system and install Docker
sudo apt update && sudo apt install -y docker.io
sudo systemctl enable --now docker

# Create game server directory
sudo mkdir -p /opt/gameserver

# Server configuration
export GAMEMODE="survival"
export DIFFICULTY="easy"
export LEVEL_NAME="world"
export PVP="true"
export SPAWN_MONSTERS="true"
export WHITE_LIST="false"
export ALLOW_FLIGHT="true"
export SPAWN_PROTECTION="16"
export HARDCORE="false"
export FORCE_GAMEMODE="false"
export ALLOW_NETHER="true"
export LEVEL_TYPE="minecraft:normal"
export GENERATE_STRUCTURES="true"
export ONLINE_MODE="true"
export ENFORCE_WHITELIST="false"
export ENFORCE_SECURE_PROFILE="true"
export ENABLE_RCON="false"
export ENABLE_QUERY="true"
export ENABLE_STATUS="true"
export ENABLE_COMMAND_BLOCK="false"
export VIEW_DISTANCE="10"
export SIMULATION_DISTANCE="10"
export MAX_TICK_TIME="60000"
export NETWORK_COMPRESSION_THRESHOLD="256"
export VOICE_CHAT_ENABLED="true"
export VOICE_MAX_DISTANCE="48"
export VOICE_WHISPER_DISTANCE="24"
export VOICE_ENABLE_GROUPS="true"

# Pull the container image
docker pull eclipse-temurin:21-jdk-alpine

#!/bin/bash

apt update
apt install -y wget curl jq

cd /opt/gameserver || { echo "Failed to change directory to /opt/gameserver"; exit 1; }

# Accept EULA
echo "Accepting EULA..."
echo "eula=true" > eula.txt

# Resolve Minecraft version
MC_VERSION="${MINECRAFT_VERSION:-latest}"
FORGE_PROMOS="https://files.minecraftforge.net/maven/net/minecraftforge/forge/promotions_slim.json"

if [ "$MC_VERSION" = "latest" ]; then
  echo "Fetching latest recommended Forge version..."
  JSON_DATA=$(curl -sSL "$FORGE_PROMOS")
  MC_VERSION=$(echo "$JSON_DATA" | jq -r '.promos | to_entries[] | .key | select(contains("recommended")) | split("-")[0]' | sort -t. -k1,1n -k2,2n -k3,3n | tail -1)
  if [ -z "$MC_VERSION" ]; then
    MC_VERSION=$(echo "$JSON_DATA" | jq -r '.promos | to_entries[] | .key | select(contains("latest")) | split("-")[0]' | sort -t. -k1,1n -k2,2n -k3,3n | tail -1)
  fi
  echo "Latest Forge MC version: $MC_VERSION"
else
  echo "Using specified version: $MC_VERSION"
fi

# Get Forge version for this MC version
echo "Resolving Forge version for MC $MC_VERSION..."
JSON_DATA=$(curl -sSL "$FORGE_PROMOS")

# Try recommended first, then latest
FORGE_VER=$(echo "$JSON_DATA" | jq -r --arg V "$MC_VERSION" '.promos["\($V)-recommended"] // empty')
if [ -z "$FORGE_VER" ]; then
  FORGE_VER=$(echo "$JSON_DATA" | jq -r --arg V "$MC_VERSION" '.promos["\($V)-latest"] // empty')
fi

if [ -z "$FORGE_VER" ]; then
  echo "ERROR: No Forge version found for MC $MC_VERSION!"
  exit 1
fi

FULL_VERSION="$MC_VERSION-$FORGE_VER"
echo "Using Forge version: $FULL_VERSION"

# Download Forge installer
FORGE_URL="https://maven.minecraftforge.net/net/minecraftforge/forge/$FULL_VERSION/forge-$FULL_VERSION-installer.jar"
echo "Downloading Forge installer..."
wget -q "$FORGE_URL" -O installer.jar

if [ ! -f installer.jar ]; then
  echo "ERROR: Failed to download Forge installer!"
  exit 1
fi

# Clean previous install for upgrade/downgrade support
rm -rf libraries/net/minecraftforge/forge
rm -f unix_args.txt

# Run the installer
echo "Running Forge installer..."
java -jar installer.jar --installServer || { echo "Forge install failed!"; exit 1; }

# Handle JAR naming based on MC version
# Only rename for pre-1.17 Forge which ships a standalone jar.
# Modern Forge (1.17+) creates a shim jar that unix_args.txt references by name - don't touch it.
ARGS_FILE=$(ls libraries/net/minecraftforge/forge/*/unix_args.txt 2>/dev/null | head -1)
if [ -z "$ARGS_FILE" ]; then
  FORGE_JAR=$(ls forge-*.jar 2>/dev/null | head -1)
  if [ -n "$FORGE_JAR" ] && [ "$FORGE_JAR" != "installer.jar" ]; then
    mv "$FORGE_JAR" server.jar
    echo "Renamed $FORGE_JAR to server.jar (pre-1.17 Forge)"
  fi
fi

# Set up unix_args.txt for 1.17+ (copy instead of symlink for Docker volume compatibility)
if [ -n "$ARGS_FILE" ]; then
  cp "$ARGS_FILE" unix_args.txt
  echo "Copied unix_args.txt from $ARGS_FILE"
fi

# Cleanup
rm -f installer.jar
rm -f run.bat run.sh installer.jar.log

echo "Forge server installed successfully."

# Install Simple Voice Chat mod if enabled
VOICE_ENABLED="${VOICE_CHAT_ENABLED:-false}"
if [ "$VOICE_ENABLED" = "true" ] || [ "$VOICE_ENABLED" = "1" ]; then
  echo "Voice Chat enabled. Installing Simple Voice Chat mod..."
  mkdir -p mods

  MODRINTH_API="https://api.modrinth.com/v2/project/simple-voice-chat/version?loaders=%5B%22forge%22%5D&game_versions=%5B%22$MC_VERSION%22%5D"
  VOICE_URL=$(curl -sSL "$MODRINTH_API" | jq -r '.[0].files[0].url // empty')

  if [ -z "$VOICE_URL" ]; then
    echo "No exact version match, trying latest Forge build..."
    MODRINTH_API="https://api.modrinth.com/v2/project/simple-voice-chat/version?loaders=%5B%22forge%22%5D"
    VOICE_URL=$(curl -sSL "$MODRINTH_API" | jq -r '.[0].files[0].url // empty')
  fi

  if [ -n "$VOICE_URL" ]; then
    wget -q "$VOICE_URL" -O mods/voicechat.jar
    echo "Simple Voice Chat mod installed."
  else
    echo "WARNING: Could not find Simple Voice Chat for Forge. Skipping."
  fi
else
  echo "Voice Chat disabled. Skipping mod install."
fi

echo "Install Completed"

sudo ufw allow 25565/tcp
sudo ufw allow 25575/tcp
sudo ufw allow 25566/both
sudo ufw allow 24454/udp