#!/bin/bash
# Starts and stops Blynk-Server
# /etc/init.d/blynk
### BEGIN INIT INFO
# Provides:     Blynk-Server
# Required-Start:       $syslog
# Required-Stop:        $syslog
# Default-Start:        2 3 4 5
# Default-Stop:         0 1 6
# Short-Description:    Blynk-Server initialisation
### END INIT INFO

# how to use:
# sudo wget --no-check-certificate -O /etc/init.d/blynk https://gist.githubusercontent.com/fragolinux/a5e7d6153afab4c52d91d41ff9860b8c/raw
# sudo chmod 755 /etc/init.d/blynk && sudo update-rc.d blynk defaults
# sudo /etc/init.d/blynk install
# credits: startup and update script based on https://github.com/WhizzCat/blynk_scripts

# on latest line of server.properties add the account (email address) you will create and then use on Blynk App, to restrict creation ONLY to that account - useful on public VPS servers
# you need to create a Gmail account and put it's address and password in latest lines of mail.properties file: http://docs.blynk.cc/#blynk-server-advanced-local-server-setup-enabling-sending-e-mails-from-local-server
# DON'T USE your regular Gmail account, create one ad hoc, because you NEED to enable "less secure apps" to have it working with Blynk: https://support.google.com/accounts/answer/6010255?hl=en
# these settings are NEEDED to receive emails with tokens to be used in Blynk sketches

# info on how to access your LOCAL server from Blynk App: https://www.hackster.io/rei-vilo/private-iot-with-blynk-on-local-server-619926

BASE=/opt/Blynk
PID=$BASE/blynk.pid
LOG=$BASE/blynk.log
# ERROR=$BASE/blynk-error.log
COMMAND="$(which java) -jar $BASE/BlynkServer.jar"

status() {
	echo
	echo "==== Status of Blynk-Server"
	if [ -f $PID ]
	then
		echo
		echo "Pid file: $( cat $PID ) [$PID]"
		echo
		ps -ef | grep -v grep | grep $( cat $PID )
	else
		echo
		echo "No Pid file"
	fi
}

start() {
	if [ -f $PID ]
	then
		echo
		echo "Already started. PID: [$( cat $PID )]"
	else
		echo "==== Starting Blynk-Server"
		touch $PID
		if nohup $COMMAND >>$LOG 2>&1 &
		then
			echo $! >$PID
			echo "Done"
			echo "$(date '+%Y-%m-%d %X'): START" >>$LOG
		else
			echo "Error"
			/bin/rm $PID
		fi
	fi
}

kill_cmd() {
	SIGNAL=""; MSG="Killing "
	while true
	do
		LIST=`ps -ef | grep -v grep | grep BlynkServer.jar | awk '{print$1}'`
		if [ "$LIST" ]
		then
			echo; echo " $MSG $LIST" ; echo
			echo $LIST | xargs kill $SIGNAL
			sleep 2
			SIGNAL="-9" ; MSG="Killing $SIGNAL"
			if [ -f $PID ]
			then
				/bin/rm $PID
			fi
		else
			echo; echo "All killed" ; echo
			break
		fi
	done
}

stop() {
    echo "==== Stopping Blynk-Server"
    if [ -f $PID ]
    then
        if kill $( cat $PID )
        then echo "Done."
             echo "$(date '+%Y-%m-%d %X'): STOP" >>$LOG
        fi
        /bin/rm $PID
        kill_cmd
    else
        echo "No pid file. Already stopped?"
    fi
}

install() {
    echo "==== Installing Latest Blynk-Server"
	source /etc/os-release
	OPSYS=${ID^^}
	DISTRO=$(/usr/bin/lsb_release -rs)

	# install java
	if [[ $OPSYS == *"BIAN"* ]] && [[ $DISTRO == *"9."* ]]; then
		sudo apt-get -y update
		sudo apt-get -y install oracle-java8-jdk
		# sudo apt-get -y install software-properties-common dirmngr
		# sudo add-apt-repository "deb http://ppa.launchpad.net/webupd8team/java/ubuntu yakkety main"
		# sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys C2518248EEA14886
	else
		echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | sudo tee /etc/apt/sources.list.d/webupd8team-java.list
		echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | sudo tee -a /etc/apt/sources.list.d/webupd8team-java.list
		sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
		sudo apt-get -y update
		echo debconf shared/accepted-oracle-license-v1-1 select true | sudo debconf-set-selections
		echo debconf shared/accepted-oracle-license-v1-1 seen true | sudo debconf-set-selections
		sudo apt-get -y install oracle-java8-installer
	fi

	# download latest Blynk Server jar file, using curl and jq (commandline JSON processor), used to extract url from Github latest releases page, and curl
	sudo apt-get -y install jq curl
	mkdir $BASE
	cd $BASE
	curl -s https://api.github.com/repos/blynkkk/blynk-server/releases/latest | jq --raw-output '.assets[0] | .browser_download_url'|wget -i - -O BlynkServer.jar

	# download addons config files
	wget https://raw.githubusercontent.com/blynkkk/blynk-server/master/server/core/src/main/resources/server.properties
	wget https://raw.githubusercontent.com/blynkkk/blynk-server/master/server/notifications/email/src/main/resources/mail.properties

	# install openssl, used to generate self-signed certificates, and generates them not interactively and passwordless
	sudo apt-get -y install openssl 
	openssl req -x509 -nodes -days 3650 -subj "/C=US/ST=Denial/L=Springfield/O=Dis/CN=www.example.com" -newkey rsa:2048 -keyout server.key -out server.crt
	openssl pkcs8 -topk8 -nocrypt -inform PEM -outform PEM -in server.key -out server.pem

	# set Blynk working folder to the one created just a few lines back (~/Blynk), and certificates
	sed -i 's#data.folder=#data.folder=/opt/Blynk#g' server.properties
	sed -i 's#server.ssl.cert=#server.ssl.cert=/opt/Blynk/server.crt#g' server.properties
	sed -i 's#server.ssl.key=#server.ssl.key=/opt/Blynk/server.key#g' server.properties

	echo "Now you can reboot..."
	echo "Admin interface will be on https://$(hostname -I|tr -d " "):9443"
	echo "Your initial Admin login email is admin@blynk.cc"
	echo "Your initial Admin password is admin"
}

update() {
    echo "==== Updating to Latest Blynk-Server"
	source /etc/os-release
	OPSYS=${ID^^}
	DISTRO=$(/usr/bin/lsb_release -rs)

	cd $BASE
	mv -f BlynkServer.jar BlynkServer.jar.old
	curl -s https://api.github.com/repos/blynkkk/blynk-server/releases/latest | jq --raw-output '.assets[0] | .browser_download_url'|wget -i - -O BlynkServer.jar
}

case "$1" in
    'start')
            start
            ;;
    'stop')
            stop
            ;;
    'restart')
            stop ; echo "Sleeping..."; sleep 1 ;
            start
            ;;
    'status')
            status
            ;;
    'install')
            install
            ;;
    'update')
            stop ; echo "Sleeping..."; sleep 1 ;
            update ;
            start
            ;;
    *)
            echo
            echo "Usage: $0 { start | stop | restart | status | install | update }"
            echo
            exit 1
            ;;
esac

exit 0