LinuxMinecraftTools/getLatestMinecraftServerJar.sh at master · M-D-M/LinuxMinecraftTools · GitHub

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#!/bin/bash

. $(dirname $0)/src/common.bash

function main {
        MCJSON=$(curl -s $__MC_JSON_URL)
        LATEST_VER=$(getJSONVal "$(getJSONData "$MCJSON" latest)" release)

        LATEST_URL_DATA=$(echo $MCJSON | egrep -o "\"id\":\"${LATEST_VER}\"[^}]*")
        LATEST_VER_URL=$(getJSONVal "$LATEST_URL_DATA" url)

        MCURLJSON=$(curl -s $LATEST_VER_URL)
	SERVER_JAR_NAME=minecraft_server_${LATEST_VER}.jar

        SERVER_URL=$(getJSONVal "$(getJSONData "$MCURLJSON" server)" url)
        SERVER_FILE_SHA1=$(getJSONVal "$(getJSONData "$MCURLJSON" server)" sha1)

	LOCAL_FILE=$([[ -n $1 ]] && printf $1 || printf /tmp/$SERVER_JAR_NAME)

	if [[ -a "${LOCAL_FILE}" ]]; then
		printf "${LOCAL_FILE} exists -- moving to ${LOCAL_FILE}.old\n"
		mv ${LOCAL_FILE} ${LOCAL_FILE}.old
	fi

	printf "\nDownloading ${SERVER_JAR_NAME} from ${SERVER_URL}..."
	wget -q -O ${LOCAL_FILE} ${SERVER_URL}
	printf "\nFile downloaded at: ${LOCAL_FILE}"

	printf "\nChecking sha1sum of ${LOCAL_FILE}..."
	DOWNLOAD_FILE_SHA1SUM=$(sha1sum ${LOCAL_FILE} | awk '{print $1}')

	if [ $(sha1sum "${LOCAL_FILE}" | awk '{print $1}') != "${SERVER_FILE_SHA1}" ]; then
		printf "\nSHA1 of downloaded file does not match!"
		rm ${LOCAL_FILE}
	else
		printf "\nSHA1 matches!\n"
	fi
}

main "$@"