#!/bin/bash
# Etherpad Installer for Jitsi Meet
# SwITNet Ltd  © - 2020, https://switnet.net/
#
# GPLv3 or later.

while getopts m: option
do
	case "${option}"
	in
		m) MODE=${OPTARG};;
		\?) echo "Usage: sudo bash ./$0 [-m debug]" && exit;;
	esac
done

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

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

clear
echo '
########################################################################
                         Etherpad Docker addon
########################################################################
                    by Software, IT & Networks Ltd
'

check_apt_policy() {
apt-cache policy 2>/dev/null| awk "/$1/{print \$3}" | awk -F '/' 'NR==1{print$2}'
}
install_ifnot() {
if [ "$(dpkg-query -W -f='${Status}' "$1" 2>/dev/null | grep -c "ok installed")" == "1" ]; then
    echo " $1 is installed, skipping..."
    else
        echo -e "\n---- Installing $1 ----"
        apt-get -yq2 install "$1"
fi
}
DOMAIN="$(find /etc/prosody/conf.d/ -name \*.lua|awk -F'.cfg' '!/localhost/{print $1}'|xargs basename)"
MEET_CONF="/etc/jitsi/meet/$DOMAIN-config.js"
WS_CONF="/etc/nginx/sites-available/$DOMAIN.conf"
PSGVER="$(apt-cache madison postgresql|awk -F'[ +]' 'NR==1{print $3}')"
ETHERPAD_DB_USER="dockerpad"
ETHERPAD_DB_NAME="etherpad"
ETHERPAD_DB_PASS="$(tr -dc "a-zA-Z0-9#*=" < /dev/urandom | fold -w 10 | head -n1)"
DOCKER_CE_REPO="$(check_apt_policy docker)"

echo "Add Docker repo"
if [ "$DOCKER_CE_REPO" = "stable" ]; then
    echo "Docker repository already installed"
else
    echo "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" > /etc/apt/sources.list.d/docker-ce.list
    wget -qO - https://download.docker.com/linux/ubuntu/gpg | apt-key add -
    apt -q2 update
fi

read -p "Set your etherpad docker admin password: " -r ETHERPAD_ADMIN_PASS


# Install required packages
install_ifnot docker-ce
install_ifnot postgresql-"$PSGVER"

# Create DB
echo -e "> Creating postgresql database for container...\n"
sudo -u postgres psql <<DB
CREATE DATABASE ${ETHERPAD_DB_NAME};
CREATE USER ${ETHERPAD_DB_USER} WITH ENCRYPTED PASSWORD '${ETHERPAD_DB_PASS}';
GRANT ALL PRIVILEGES ON DATABASE ${ETHERPAD_DB_NAME} TO ${ETHERPAD_DB_USER};
DB
echo "  -- Your etherpad db password is: $ETHERPAD_DB_PASS"
echo -e "     Please save it somewhere safe.\n"

# Check fot docker if not running then execute
if [ ! "$(docker ps -q -f name=etherpad)" ]; then
    if [ "$(docker ps -aq -f status=exited -f name=etherpad)" ]; then
        # cleanup
        docker rm etherpad
    fi
    # run your container
    docker run -d --restart always \
    --network=host \
    --name etherpad \
    -p 127.0.0.1:9001:9001 \
    -e "ADMIN_PASSWORD=$ETHERPAD_ADMIN_PASS" \
    -e "DB_TYPE=postgres"   \
    -e "DB_HOST=localhost"   \
    -e "DB_PORT=5432"   \
    -e "DB_NAME=$ETHERPAD_DB_NAME"   \
    -e "DB_USER=$ETHERPAD_DB_USER" \
    -e "DB_PASS=$ETHERPAD_DB_PASS" \
    -i -t etherpad/etherpad
fi

# Tune webserver for Jitsi App control

if [ "$(grep -c etherpad "$WS_CONF")" != 0 ]; then
    echo "> Webserver seems configured, skipping..."
elif [ -f "$WS_CONF" ]; then
    echo "> Setting up webserver configuration file..."
    sed -i "/# ensure all static content can always be found first/i \ \ \ \ #Etherpad block" "$WS_CONF"
    sed -i "/# ensure all static content can always be found first/i \ \ \ \ location \^\~\ \/etherpad\/ {" "$WS_CONF"
    sed -i "/# ensure all static content can always be found first/i \ \ \ \ \ \ \ \ proxy_pass http:\/\/localhost:9001\/;" "$WS_CONF"
    sed -i "/# ensure all static content can always be found first/i \ \ \ \ \ \ \ \ proxy_set_header X-Forwarded-For \$remote_addr;" "$WS_CONF"
    sed -i "/# ensure all static content can always be found first/i \ \ \ \ \ \ \ \ proxy_buffering off;" "$WS_CONF"
    sed -i "/# ensure all static content can always be found first/i \ \ \ \ \ \ \ \ proxy_set_header       Host \$host;" "$WS_CONF"
    sed -i "/# ensure all static content can always be found first/i \ \ \ \ }" "$WS_CONF"
    sed -i "/# ensure all static content can always be found first/i \\\n" "$WS_CONF"
else
    echo "> No etherpad config done to server file"
fi

# Configure config.js
if [ "$(grep -c "etherpad_base" "$WS_CONF")" != 0 ]; then
    echo -e "> $MEET_CONF seems configured, skipping...\n"
else
    echo -e "> Setting etherpad domain at $MEET_CONF...\n"
    sed -i "/ openSharedDocumentOnJoin:/a\ \ \ \ etherpad_base: \'https://$DOMAIN/etherpad/p/\'," "$MEET_CONF"
fi

echo "> Checking nginx configuration..."

if nginx -t 2>/dev/null ; then
    echo -e "  -- Docker configuration seems fine, enabling it."
#    systemctl reload nginx
else
    echo "Please check your configuration, something may be wrong."
    echo "Will not try to enable etherpad nginx configuration"
fi