Host a Minecraft - Java Edition (Paper) 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="false"
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-jre-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}"
PAPER_API="https://api.papermc.io/v2/projects/paper"

if [ "$MC_VERSION" = "latest" ]; then
  echo "Fetching latest Paper version..."
  MC_VERSION=$(curl -sSL "$PAPER_API" | jq -r '.versions[-1]')
  # Skip pre-releases and RCs - find latest stable
  while echo "$MC_VERSION" | grep -qE '(pre|rc)'; do
    VERSIONS=$(curl -sSL "$PAPER_API" | jq -r '.versions[]')
    MC_VERSION=$(echo "$VERSIONS" | grep -vE '(pre|rc)' | tail -1)
    break
  done
  echo "Latest stable Paper version: $MC_VERSION"
else
  echo "Using specified version: $MC_VERSION"
fi

# Get latest build for this version
echo "Fetching latest Paper build for $MC_VERSION..."
BUILD_INFO=$(curl -sSL "$PAPER_API/versions/$MC_VERSION/builds")
if [ -z "$BUILD_INFO" ] || echo "$BUILD_INFO" | jq -e '.error' > /dev/null 2>&1; then
  echo "ERROR: No Paper builds found for version $MC_VERSION!"
  exit 1
fi

LATEST_BUILD=$(echo "$BUILD_INFO" | jq -r '.builds[-1].build')
JAR_NAME=$(echo "$BUILD_INFO" | jq -r '.builds[-1].downloads.application.name')

if [ -z "$LATEST_BUILD" ] || [ "$LATEST_BUILD" = "null" ]; then
  echo "ERROR: Could not determine latest build for Paper $MC_VERSION!"
  exit 1
fi

DOWNLOAD_URL="$PAPER_API/versions/$MC_VERSION/builds/$LATEST_BUILD/downloads/$JAR_NAME"
echo "Downloading Paper $MC_VERSION build $LATEST_BUILD..."
wget -q "$DOWNLOAD_URL" -O server.jar
echo "Paper download completed."

# Install Simple Voice Chat plugin if enabled
VOICE_ENABLED="${VOICE_CHAT_ENABLED:-false}"
if [ "$VOICE_ENABLED" = "true" ] || [ "$VOICE_ENABLED" = "1" ]; then
  echo "Voice Chat enabled. Installing Simple Voice Chat plugin..."
  mkdir -p plugins
  
  # Fetch latest Paper-compatible version from Modrinth
  MODRINTH_API="https://api.modrinth.com/v2/project/simple-voice-chat/version?loaders=%5B%22paper%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 "$VOICE_URL" ]; then
    # Fallback: try without version filter to get latest compatible
    echo "No exact version match, trying latest Paper build..."
    MODRINTH_API="https://api.modrinth.com/v2/project/simple-voice-chat/version?loaders=%5B%22paper%22%5D"
    VOICE_URL=$(curl -sSL "$MODRINTH_API" | jq -r '.[0].files[0].url // empty')
  fi
  
  if [ -n "$VOICE_URL" ]; then
    wget -q "$VOICE_URL" -O plugins/voicechat.jar
    echo "Simple Voice Chat plugin installed."
  else
    echo "WARNING: Could not find Simple Voice Chat for Paper. Skipping."
  fi
else
  echo "Voice Chat disabled. Skipping plugin 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