#!/bin/bash
##################################################################
#  Upgrade JDK in CATIA NoMagic Webapp Platform to a newer OpenJDK
#  CATIA No Magic DevOps Team
##################################################################

###  JRE_DOWNLOAD contains the download URL to the target OpenJDK tar archive
###  The example below upgrades the JDK to selected OpenJDK

# Edit default version if you can't input it during upgrade
DEFAULT_VERSION=21.0.8+9

WAP_SVC_PATH=/etc/systemd/system/webapp.service
###########################################
#
#  DO NOT MODIFY ANYTHING BELOW THIS POINT
#
###########################################
# Check if script is run as root or sudo.
if [ "$EUID" -ne 0 ];then
	echo
	echo "Please run as root or sudo."
	exit 1
fi
unset JRE_TAR
JRE_TAR=$(find *jre_x64_linux_hotspot* 2>/dev/null | tail -n1)
if [[ -n "$JRE_TAR" ]]; then
	JRE_VERSION=$(basename $JRE_TAR .tar.gz | cut -d '_' -f 5)
	echo ""
	echo "Local upgrade package found for Java $JRE_VERSION: $JRE_TAR"
	read -p "Proceed with upgrade using this local package (y to continue)? " qinstall
	if ! [[ $qinstall =~ [yY](es)* ]]; then unset JRE_TAR; fi
fi

# Download Java upgrade package
if ! [[ -n "$JRE_TAR" ]]; then
	echo ""
	echo "----------------------------------------------------------------------------------------------------"
	read -e -p "Please enter the full Java version for upgrade [default is: $DEFAULT_VERSION] : " JRE_VERSION
	echo "----------------------------------------------------------------------------------------------------"
	echo ""
	JRE_VERSION="${JRE_VERSION:-$DEFAULT_VERSION}"
	MAJOR_VERSION=$(echo $JRE_VERSION | cut -d . -f 1)
	DOWNLOAD_VERSION=${JRE_VERSION/+/_}
	JRE_DOWNLOAD=https://github.com/adoptium/temurin$MAJOR_VERSION-binaries/releases/download/jdk-$JRE_VERSION/OpenJDK${MAJOR_VERSION}U-jre_x64_linux_hotspot_$DOWNLOAD_VERSION.tar.gz
	#  Install wget
	yum install wget -y -q
	##   Download OpenJDK
	wget $JRE_DOWNLOAD
	JRE_TAR=$(basename $JRE_DOWNLOAD)
	[ ! -e "${JRE_TAR}" ] && echo "Download failed! Check the version or internet connection and try again." && exit|| echo "$JRE_TAR download successful."
fi

echo "OpenJDK will be upgraded to: "$JRE_VERSION "version."

if [ -f $WAP_SVC_PATH ]; then
	JRE_HOME=$(cat /etc/systemd/system/webapp.service | grep CATALINA_HOME | cut -f 3 -d '=')/jre
	JRE_OWNER=$(stat -c "%U:%G" $JRE_HOME)
else
	echo "Could not find webapp service file. Exiting."
	exit 1
fi

##  Remove current JRE_HOME
rm -fr $JRE_HOME

# Create temp directory
mkdir _tmp
cd _tmp
##  Extract OpenJDK
mkdir -p $JRE_HOME
tar -xf ../$JRE_TAR -C $JRE_HOME --strip-components=1
chown -R $JRE_OWNER $JRE_HOME

####################################
# Remove foder with extracted files
cd ..
rm -fr _tmp
echo "Upgrade completed successfully."