#!/bin/bash
# JVB2 Node Aggregator
# SwITNet Ltd © - 2021, https://switnet.net/
# GPLv3 or later.

### 0_LAST EDITION TIME STAMP ###
# LETS: AUTOMATED_EDITION_TIME
### 1_LAST EDITION ###

#Make sure the file name is the required one
if [ ! "$(basename "$0")" = "add-jvb2-node.sh" ]; then
    echo "For most cases naming won't matter, for this one it does."
    echo "Please use the original name for this script: \`add-jvb2-node.sh', and run again."
    exit
fi

while getopts m: option
do
    case "${option}"
    in
        m) MODE=${OPTARG};;
        \?) echo "Usage: sudo ./add-jvb2-node.sh [-m debug]" && exit;;
    esac
done

#DEBUG
if [ "$MODE" = "debug" ]; then
set -x
fi

#Check admin rights
if ! [ "$(id -u)" = 0 ]; then
   echo "You need to be root or have sudo privileges!"
   exit 0
fi

### 0_VAR_DEF
MAIN_SRV_DIST=TBD
MAIN_SRV_REPO=TBD
MAIN_SRV_DOMAIN=TBD

JVB_HOSTNAME=TBD
JVB_HOST=TBD
JVB_PORT=TBD
JVB_SECRET=TBD
JVB_OPTS=TBD
SYS_PROPS=TBD
AWS_HARVEST=TBD
STUN_MAPPING=TBD
ENABLE_STATISTICS=TBD
SHARD_HOSTNAME=TBD
SHARD_DOMAIN=TBD
SHARD_PASS=TBD
MUC_JID=TBD

#MJS_USER=TBD
#MJS_USER_PASS=TBD
#START=0
#LAST=TBD

THIS_SRV_DIST=$(lsb_release -sc)
JITSI_REPO=$(apt-cache policy | awk '/jitsi/&&/stable/{print$3}' | awk -F / 'NR==1{print$1}')
JVB2_CONF="/etc/jitsi/videobridge/config"
JVB2_NCONF="/etc/jitsi/videobridge/jvb.conf"
JVB2_SIP="/etc/jitsi/videobridge/sip-communicator.properties"
SHORT_ID="$(awk '{print substr($0,0,7)}' /etc/machine-id)"
#PUBLIC_IP="$(dig -4 @resolver1.opendns.com ANY myip.opendns.com +short)"
#GITHUB_RAW="https://raw.githubusercontent.com"
#GIT_REPO="switnet-ltd/quick-jibri-installer"
### 1_VAR_DEF

# sed limiters for add-jvb2-node.sh variables
var_dlim() {
    grep -n "$1" add-jvb2-node.sh|head -n1|cut -d ":" -f1
}

check_var() {
    if [ -z "$2" ]; then
        echo -e "Check if variable $1 is set: \xE2\x9C\x96 \nExiting..."
        exit
    else
        echo -e "Check if variable $1 is set: \xE2\x9C\x94"
    fi
}

#Check server and node OS
if [ ! "$THIS_SRV_DIST" = "$MAIN_SRV_DIST" ]; then
    echo "Please use the same OS for the JVB2 setup on both servers."
    echo "This server is based on: $THIS_SRV_DIST"
    echo "The main server record claims is based on: $MAIN_SRV_DIST"
    exit
fi

#Check system resources
echo "Verifying System Resources:"
if [ "$(nproc --all)" -lt 4 ];then
  echo "
Warning!: The system do not meet the CPU recomendations for a JVB node for heavy loads.
>> We recommend 4 cores/threads or above for JVB2!
"
  CPU_MIN="N"
else
  echo "CPU Cores/Threads: OK ($(nproc --all))"
  CPU_MIN="Y"
fi
### Test RAM size (8GB min) ###
mem_available=$(grep MemTotal /proc/meminfo| grep -o '[0-9]\+')
if [ "${mem_available}" -lt 7700000 ]; then
  echo "
Warning!: The system do not meet the CPU recomendations for a JVB node for heavy loads.
>> We recommend 8GB RAM or above for JVB2!
"
  MEM_MIN="N"
else
  echo "Memory: OK ($((mem_available/1024)) MiB)"
  MEM_MIN="Y"
fi
if [ "$CPU_MIN" = "Y" ] && [ "$MEM_MIN" = "Y" ];then
    echo "All requirements seems meet!"
    echo "
    - We hope you have a nice recording/streaming session
    "
else
    echo "CPU ($(nproc --all))/RAM ($((mem_available/1024)) MiB) does NOT meet minimum recommended requirements!"
    echo "We highly advice to increase the resources in order to install this JVB2 node."
    while [[ "$CONTINUE_LOW_RES" != "yes" && "$CONTINUE_LOW_RES" != "no" ]]
    do
    read -p "> Do you want to continue?: (yes or no)"$'\n' -r CONTINUE_LOW_RES
    if [ "$CONTINUE_LOW_RES" = "no" ]; then
            echo "See you next time with more resources!..."
            exit
    elif [ "$CONTINUE_LOW_RES" = "yes" ]; then
            echo "Please keep in mind that we might not support underpowered nodes."
    fi
    done
fi

echo "
#-----------------------------------------------------------------------
# Checking initial necessary variables...
#-----------------------------------------------------------------------"

check_var JVB_HOSTNNAME "$JVB_HOSTNAME"
if [ -z "$JVB_HOST" ]; then
  echo "JVB_HOST is empty, but it may be ok for it to be empty, skipping empty test."
else
  check_var JVB_HOST "$JVB_HOST"
fi
check_var JVB_PORT "$JVB_PORT"
check_var JVB_SECRET "$JVB_SECRET"
check_var JVB_OPTS "$JVB_OPTS"
check_var SYS_PROPS "$SYS_PROPS"
check_var AWS_HARVEST "$AWS_HARVEST"
check_var STUN_MAPPING "$STUN_MAPPING"
check_var ENABLE_STATISTICS "$ENABLE_STATISTICS"
check_var SHARD_HOSTNAME "$SHARD_HOSTNAME"
check_var SHARD_DOMAIN "$SHARD_DOMAIN"
check_var SHARD_PASS "$SHARD_PASS"
check_var MUC_JID "$MUC_JID"
check_var MAIN_SRV_DOMAIN "$MAIN_SRV_DOMAIN"

# Rename hostname for each jvb2 node
hostnamectl set-hostname "jvb_${SHORT_ID}.${MAIN_SRV_DOMAIN}"
sed -i "1i 127.0.0.1 jvb_${SHORT_ID}.${MAIN_SRV_DOMAIN}" /etc/hosts

# Jitsi-Meet Repo
echo "Add Jitsi repo"
if [ -z "$JITSI_REPO" ]; then
    echo "deb http://download.jitsi.org $MAIN_SRV_REPO/" > /etc/apt/sources.list.d/jitsi-"$MAIN_SRV_REPO".list
    wget -qO -  https://download.jitsi.org/jitsi-key.gpg.key | apt-key add -
elif [ ! "$JITSI_REPO" = "$MAIN_SRV_REPO" ]; then
    echo "Main and node servers repository don't match, extiting.."
    exit
elif [ "$JITSI_REPO" = "$MAIN_SRV_REPO" ]; then
    echo "Main and node servers repository match, continuing..."
else
    echo "Jitsi $JITSI_REPO repository already installed"
fi

# Requirements
echo "We'll start by installing system requirements this may take a while please be patient..."
apt-get update -q2
apt-get dist-upgrade -yq2

apt-get -y install \
                    apt-show-versions \
                    bmon \
                    curl \
                    git \
                    htop \
                    ssh \
                    unzip \
                    wget

echo "# Check and Install HWE kernel if possible..."
HWE_VIR_MOD="$(apt-cache madison linux-modules-extra-virtual-hwe-"$(lsb_release -sr)" 2>/dev/null|head -n1|grep -c "extra-virtual-hwe")"
if [ "$HWE_VIR_MOD" == "1" ]; then
    apt-get -y install \
    linux-image-generic-hwe-"$(lsb_release -sr)" \
    linux-modules-extra-virtual-hwe-"$(lsb_release -sr)"
    else
    apt-get -y install \
    linux-modules-extra-"$(uname -r)"
fi

echo "
#--------------------------------------------------
# Install JVB2
#--------------------------------------------------
"
echo "jitsi-videobridge jitsi-videobridge/jvb-hostname string $MAIN_SRV_DOMAIN" | debconf-set-selections

apt-get -y install \
                    jitsi-videobridge2 \
                    openjdk-8-jre-headless

echo '
########################################################################
                        Start JVB2 configuration
########################################################################
'

mv $JVB2_CONF ${JVB2_CONF}-dpkg-file

## JVB2 - CONFIG
cat << JVB2_CONF > $JVB2_CONF
# Jitsi Videobridge settings

# sets the XMPP domain (default: none)
JVB_HOSTNAME=$JVB_HN

# sets the hostname of the XMPP server (default: domain if set, localhost otherwise)
JVB_HOST=$JVB_HOST

# sets the port of the XMPP server (default: 5275)
JVB_PORT=$JVB_PORT

# sets the shared secret used to authenticate to the XMPP server
JVB_SECRET=$JVB_SECRET

# extra options to pass to the JVB daemon
JVB_OPTS=$JVB_OPTS

# adds java system props that are passed to jvb (default are for home and logging config file)
JAVA_SYS_PROPS=$SYS_PROPS

JVB2_CONF


mv $JVB2_SIP $JVB2_SIP-dpkg-file
## JVB2 - SIP
cat << JVB2_SIP > $JVB2_SIP
# Legacy conf file, new format already at
# /etc/jitsi/videobridge/jvb.conf
# --add-jvb2-node.sh
JVB2_SIP

echo -e "\n---- Setting new config format for jvb2 node. ----"
sed -i '${/\}/d;}' $JVB2_NCONF
cat << JVB2 >> $JVB2_NCONF
    stats {
      # Enable broadcasting stats/presence in a MUC
      enabled = true
      transports = [
        { type = "muc" }
      ]
    }

    apis {
      xmpp-client {
        configs {
          # Connect to the first XMPP server
          xmpp-server-$ADDUP {
            hostname="$MAIN_SRV_DOMAIN"
            domain = "auth.$MAIN_SRV_DOMAIN"
            username = "jvb"
            password = "$SHARD_PASS"
            muc_jids = "JvbBrewery@internal.auth.$MAIN_SRV_DOMAIN"
            # The muc_nickname must be unique across all jitsi-videobridge instances
            muc_nickname = "jvb2-$ADDUP"
            disable_certificate_verification = true
        }
      }
    }
  }
}
JVB2

#Enable jvb2 services
systemctl enable jitsi-videobridge2.service
systemctl restart jitsi-videobridge2.service

echo "
########################################################################
                        Node addition complete!!

               For customized support: http://switnet.net
########################################################################
"

echo "Rebooting in..."
secs=$((15))
while [ $secs -gt 0 ]; do
   echo -ne "$secs\033[0K\r"
   sleep 1
   : $((secs--))
done
reboot