minecraft

#!/bin/bash
MCSERVER_BIN_PATH="/srv/minecraft-bin"
MCFORGE_INSTALLER_URL="http://files.minecraftforge.net/maven/net/minecraftforge/forge/$MINECRAFT_VERSION-$MCFORGE_VERSION/forge-$MINECRAFT_VERSION-$MCFORGE_VERSION-installer.jar"
MC_SERVER_URL="https://s3.amazonaws.com/Minecraft.Download/versions/$MINECRAFT_VERSION/minecraft_server.$MINECRAFT_VERSION.jar"
MC_SERVER_JAR="minecraft_server.$MINECRAFT_VERSION.jar"
MCFORGE_SERVER_JAR="forge-$MINECRAFT_VERSION-$MCFORGE_VERSION-universal.jar"

check_env() {
    if [ "$MINECRAFT_EULA" == "true" ]; then
        echo "update $MCSERVER_PATH/eula.txt"
        echo "eula=$MINECRAFT_EULA" > $MCSERVER_PATH/eula.txt
    else
        >&2 echo "Mojang: you must agree EULA. then you need set MINECRAFT_EULA to true."
        exit 1
    fi

    # Do not allow to run if there is no DEFAULT_OP
    if [ -z "$DEFAULT_OP" ]; then
        >&2 echo "DEFAULT_OP is necessary. please set it to continue."
        exit 1
    fi
}

download_installer() {
    # Download the Minecraft server installer JAR if it does not exist.
    if [ ! -f  "$MCSERVER_BIN_PATH/$MCFORGE_SERVER_JAR" ] && [ ! -f "$MCSERVER_BIN_PATH/$MCFORGE_INSTALLER_JAR" ]; then
        echo "download Forge installer $MCFORGE_INSTALLER_JAR ($MCFORGE_INSTALLER_URL)"
        curl -f -S "$MCFORGE_INSTALLER_URL" -o "$MCSERVER_BIN_PATH/$MCFORGE_INSTALLER_JAR"

        if [ ! -f "$MCSERVER_BIN_PATH/$MCFORGE_INSTALLER_JAR" ]; then
            >&2 echo "download failure $MCFORGE_INSTALLER_JAR."
            exit 1
        fi
    fi
}

download_mc_server() {
    if [ ! -f  "$MCSERVER_BIN_PATH/$MCFORGE_SERVER_JAR" ] && [ ! -f "$MCSERVER_BIN_PATH/$MC_SERVER_JAR" ]; then
        echo "download Minecraft server $MCFORGE_SERVER_JAR ($MC_SERVER_URL)"
        curl -f -S "$MC_SERVER_URL" -o "$MCSERVER_BIN_PATH/$MC_SERVER_JAR"
        
        if [ ! -f "$MCSERVER_BIN_PATH/$MC_SERVER_JAR" ]; then
            >&2 echo "download failure $MCFORGE_INSTALLER_JAR."
            exit 1
        fi
    fi
}

install_server() {
    # Download the Minecraft server JAR if it does not exist.
    if [ ! -f  "$MCSERVER_BIN_PATH/$MCFORGE_SERVER_JAR" ] && [ -f "$MCSERVER_BIN_PATH/$MCFORGE_INSTALLER_JAR" ]; then
        echo "install forge V$MCFORGE_VERSION"
        java -server -jar "$MCSERVER_BIN_PATH/$MCFORGE_INSTALLER_JAR" --installServer
        if [ ! -f "$MCSERVER_BIN_PATH/$MCFORGE_SERVER_JAR" ]; then
            >&2 echo "forge install failure."
            exit 1
        fi
    else
        echo "can not install forge V$MCFORGE_VERSION"
        echo "$MCSERVER_BIN_PATH/$MCFORGE_INSTALLER_JAR can not find"
        rm "$MCSERVER_BIN_PATH/server-installed"
    fi
}
first_run() {
    if [ ! -f "$MCSERVER_PATH/$MCFORGE_SERVER_JAR" ]; then
        echo "detected the server not exist"
        echo "copy server"
        cp -sR $MCSERVER_BIN_PATH/* "$MCSERVER_PATH"
    fi
    if [ ! -f "$MCSERVER_PATH/server.properties" ]; then
        echo "detected the server.properties not exist"
        echo "create $MCSERVER_PATH/server.properties and configure environment"
        echo "generator-settings=$GENERATOR_SETTINGS" | tee -a $MCSERVER_PATH/server.properties
        echo "op-permission-level=$OP_PERMISSION_LEVEL" | tee -a $MCSERVER_PATH/server.properties
        echo "allow-nether=$ALLOW_NETHER" | tee -a $MCSERVER_PATH/server.properties
        echo "level-name=$LEVEL_NAME" | tee -a $MCSERVER_PATH/server.properties
        echo "enable-query=$ENABLE_QUERY" | tee -a $MCSERVER_PATH/server.properties
        echo "allow-flight=$ALLOW_FLIGHT" | tee -a $MCSERVER_PATH/server.properties
        echo "announce-player-achievements=$ANNOUNCE_PLAYER_ACHIEVEMENTS" | tee -a $MCSERVER_PATH/server.properties
        echo "server-port=$SERVER_PORT" | tee -a $MCSERVER_PATH/server.properties
        echo "level-type=$LEVEL_TYPE" | tee -a $MCSERVER_PATH/server.properties
        echo "enable-rcon=$ENABLE_RCON" | tee -a $MCSERVER_PATH/server.properties
        echo "rcon.password=$RCON_PASSWORD" | tee -a $MCSERVER_PATH/server.properties
        echo "rcon-port=$RCON_PORT" | tee -a $MCSERVER_PATH/server.properties
        echo "force-gamemode=$FORCE_GAMEMODE" | tee -a $MCSERVER_PATH/server.properties
        echo "level-seed=$LEVEL_SEED" | tee -a $MCSERVER_PATH/server.properties
        echo "server-ip=$SERVER_IP" | tee -a $MCSERVER_PATH/server.properties
        echo "max-build-height=$MAX_BUILD_HEIGHT" | tee -a $MCSERVER_PATH/server.properties
        echo "spawn-npcs=$SPAWN_NPCS" | tee -a $MCSERVER_PATH/server.properties
        echo "white-list=$WHITE_LIST" | tee -a $MCSERVER_PATH/server.properties
        echo "spawn-animals=$SPAWN_ANIMALS" | tee -a $MCSERVER_PATH/server.properties
        echo "snooper-enabled=$SNOOPER_ENABLED" | tee -a $MCSERVER_PATH/server.properties
        echo "online-mode=$ONLINE_MODE" | tee -a $MCSERVER_PATH/server.properties
        echo "resource-pack=$RESOURCE_PACK" | tee -a $MCSERVER_PATH/server.properties
        echo "pvp=$PVP" | tee -a $MCSERVER_PATH/server.properties
        echo "difficulty=$DIFFICULTY" | tee -a $MCSERVER_PATH/server.properties
        echo "enable-command-block=$ENABLE_COMMAND_BLOCK" | tee -a $MCSERVER_PATH/server.properties
        echo "player-idle-timeout=$PLAYER_IDLE_TIMEOUT" | tee -a $MCSERVER_PATH/server.properties
        echo "gamemode=$GAMEMODE" | tee -a $MCSERVER_PATH/server.properties
        echo "max-players=$MAX_PLAYERS" | tee -a $MCSERVER_PATH/server.properties
        echo "spawn-monsters=$SPAWN_MONSTERS" | tee -a $MCSERVER_PATH/server.properties
        echo "view-distance=$VIEW_DISTANCE" | tee -a $MCSERVER_PATH/server.properties
        echo "generate-structures=$GENERATE_STRUCTURES" | tee -a $MCSERVER_PATH/server.properties
        echo "configure complete"
    fi
    
    if [ ! -f $MCSERVER_PATH/ops.json ]; then
        echo "add $DEFAULT_OP in OP list."
        echo "$DEFAULT_OP" > $MCSERVER_PATH/ops.txt
    fi
}

update_permissions() {
    chown -R minecraft:minecraft $MCSERVER_PATH
}

server_start() {
    echo "start server"
    java $MINECRAFT_OPTS -jar "$MCSERVER_PATH/$MCFORGE_SERVER_JAR" || echo "server error return code $? , please check the environment"
}
echo "Minecraft Forge Server Docker ver - execute script, arguments is $1"
case "$1" in
    install)
        download_installer
        download_mc_server
        install_server
        ;;
    run)
        check_env
        first_run
        server_start
        ;;
    *)
        exec "$@"
esac