#!/bin/sh

# CONFIGURATION

script_folder=/volume1/Plex/scripts
# p12 file
p12_file_path=$script_folder/syno.p12
# p12 password
p12cert_password=xxxxxxxxxxxxxxxxxxxx
# Synology's Default Let's encrypt folder
letsencrypt_cert_folder=/usr/syno/etc/certificate/_archive/RANDOM FOLDER NAME
# renew timestamp
renew_timestamp=renew_plex_timestamp


# DO NOT CHANGE BELOW UNLESS YOU'RE A WIZARD

generate_p12=false
current_date=`date +"%s"`
current_certificate_date=`openssl x509 -enddate -noout -in $letsencrypt_cert_folder/cert.pem | cut -d'=' -f2`
current_certificate_timestamp=`date -d "$current_certificate_date" +"%s"`

# check if the renew_timestamp file exists
if [ ! -f $script_folder/$renew_timestamp ]; then
  echo "Generate timestamp for the current renew date... "
  echo $current_certificate_timestamp > $script_folder/$renew_timestamp
  chmod +rw $script_folder/$renew_timestamp
  chown admin:users $script_folder/$renew_timestamp

# generate the first p12 file
  generate_p12=true
else
  renew_date=`cat $script_folder/$renew_timestamp`
  # check if it is necessary to renew the certificate or not
  if expr "$current_date" ">" "$renew_date" > /dev/null; then
    # generate a new p12 file
      echo "Renewing certificate..."
      generate_p12=true

   # update timestamp in the file
  echo $current_certificate_timestamp > $script_folder/$renew_timestamp
 else
 echo "It is not necessary to renew the certificate, abort."
   exit 0
                  fi
  fi

# generate a new certificate file if necessary, and restart Plex
  if expr "$generate_p12" "=" "true" > /dev/null; then
  echo "Generating the p12 certificate file..."
 openssl pkcs12 -export -out $p12_file_path -in $letsencrypt_cert_folder/cert.pem -inkey $letsencrypt_cert_folder/privkey.pem -certfile $letsencrypt_cert_folder/chain.pem -name "Domain" -password pass:$p12cert_password
   chmod +r $p12_file_path
  chown admin:users $p12_file_path
   echo "Restarting Plex Media Server..."
  sh /var/packages/Plex\ Media\ Server/scripts/start-stop-status stop
  sh /var/packages/Plex\ Media\ Server/scripts/start-stop-status start
  echo "Done."
  fi