#!/bin/bash

# Retrieve arguments
domain=${1}
url_path=${2}
server_name=${3}
crt_client_path=${4}
crt_client_key_path=${5}
crt_server_ca_path=${6}
login_user=${7}
login_passphrase=${8}

# Check arguments
if [ -z "${server_name}" ]; then
  echo "ERROR: You need a VPN server name" >&2
  exit 1
fi

if [ \( -z "${crt_client_path}" -a ! -z "${crt_client_key_path}" \)\
    -o \( ! -z "${crt_client_path}" -a -z "${crt_client_key_path}" \) ]; then

  echo "ERROR: A client certificate is needed when you suggest a key (or vice versa)" >&2
  exit 1
fi

if [ ! -z "${crt_client_key_path}" -a -z "${crt_server_ca_path}" ]; then
  echo "ERROR: If you can suggest a local path for the client certificates, you probably can suggest one other for the (mandatory) CA server" >&2
  exit 1
fi

if [ \( -z "${login_user}" -a ! -z "${login_passphrase}" \)\
    -o \( ! -z "${login_user}" -a -z "${login_passphrase}" \) ]; then

  echo "ERROR: A login password is needed when you suggest a login user (or vice versa)" >&2
  exit 1
fi

if [ ! -z "${crt_client_path}" -a ! -f "${crt_client_path}" ]; then
  echo "ERROR: The local path <${crt_client_path}> does not exist" >&2
  exit 1
fi

if [ ! -z "${crt_client_key_path}" -a ! -f "${crt_client_key_path}" ]; then
  echo "ERROR: The local path <${crt_client_key_path}> does not exist" >&2
  exit 1
fi

if [ ! -z "${crt_server_ca_path}" -a ! -f "${crt_server_ca_path}" ]; then
  echo "ERROR: The local path <${crt_server_ca_path}> does not exist" >&2
  exit 1
fi

# Check domain/path availability
sudo yunohost app checkurl ${domain}${url_path} -a vpnclient
if [ ! $? -eq 0 ]; then
  exit 1
fi

# Install packages
#sudo apt-get update
sudo apt-get --assume-yes --force-yes install openvpn php5-fpm

# Extra packages
sudo apt-get --assume-yes --force-yes install sipcalc

# Save arguments
sudo yunohost app setting vpnclient server_name -v "${server_name}"
sudo yunohost app setting vpnclient server_port -v 1194
sudo yunohost app setting vpnclient server_proto -v udp
sudo yunohost app setting vpnclient ip6_addr -v none
sudo yunohost app setting vpnclient ip6_net -v none
sudo yunohost app setting vpnclient login_user -v "${login_user}"
sudo yunohost app setting vpnclient login_passphrase -v "${login_passphrase}"

# Install IPv6 scripts
sudo install -o root -g root -m 0755 ../conf/ipv6_expanded /usr/local/bin/
sudo install -o root -g root -m 0755 ../conf/ipv6_compressed /usr/local/bin/

# Copy confs
sudo install -b -o root -g root -m 0644 ../conf/openvpn_client.conf.tpl /etc/openvpn/client.conf.tpl
sudo install -b -o root -g root -m 0644 ../conf/nginx_vpnadmin.conf "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"
sudo install -b -o root -g root -m 0644 ../conf/phpfpm_vpnadmin.conf /etc/php5/fpm/pool.d/vpnadmin.conf

# Copy web sources
sudo mkdir -pm 0755 /var/www/vpnadmin/
sudo cp -a ../sources/* /var/www/vpnadmin/

sudo chown -R root: /var/www/vpnadmin/
sudo chmod -R 0644 /var/www/vpnadmin/*
sudo find /var/www/vpnadmin/ -type d -exec chmod +x {} \;

# Copy certificates
sudo mkdir -pm 0770 /etc/openvpn/keys/
sudo chown root:admins /etc/openvpn/keys/

[ ! -z "${crt_client_path}" ] &&\
  sudo install -b -o root -g admins -m 0660 "${crt_client_path}" /etc/openvpn/keys/user.crt

[ ! -z "${crt_client_key_path}" ] &&\
  sudo install -b -o root -g admins -m 0660 "${crt_client_key_path}" /etc/openvpn/keys/user.key

[ ! -z "${crt_server_ca_path}" ] &&\
  sudo install -b -o root -g admins -m 0660 "${crt_server_ca_path}" /etc/openvpn/keys/ca-server.crt

sudo rm -f "${crt_client_path}" "${crt_client_key_path}" "${crt_server_ca_path}"

# Credentials file for (optional) login
sudo cat << EOF > /etc/openvpn/keys/credentials
${login_user}
${login_passphrase}
EOF

sudo chown -R root:admins /etc/openvpn/keys/credentials
sudo chmod 0460 /etc/openvpn/keys/credentials

# Create user for the web admin
sudo useradd -MUr vpnadmin

# Fix confs
## nginx
sudo sed "s|<TPL:NGINX_LOCATION>|${url_path}|g" -i "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"
sudo sed 's|<TPL:NGINX_REALPATH>|/var/www/vpnadmin/|g' -i "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"
sudo sed 's|<TPL:PHP_NAME>|vpnadmin|g' -i "/etc/nginx/conf.d/${domain}.d/vpnadmin.conf"

## php-fpm
sudo sed 's|<TPL:PHP_NAME>|vpnadmin|g' -i /etc/php5/fpm/pool.d/vpnadmin.conf
sudo sed 's|<TPL:PHP_USER>|admin|g' -i /etc/php5/fpm/pool.d/vpnadmin.conf
sudo sed 's|<TPL:PHP_GROUP>|admins|g' -i /etc/php5/fpm/pool.d/vpnadmin.conf
sudo sed 's|<TPL:NGINX_REALPATH>|/var/www/vpnadmin/|g' -i /etc/php5/fpm/pool.d/vpnadmin.conf
sudo sed 's|^;\?\s*max_execution_time.\+|max_execution_time = 600|' -i /etc/php5/fpm/php.ini

# Fix sources
sudo sed "s|<TPL:NGINX_LOCATION>|${url_path}|g" -i /var/www/vpnadmin/config.php

# Copy init script
sudo install -b -o root -g root -m 0755 ../conf/init_ynh-vpnclient /etc/init.d/ynh-vpnclient

# Set default inits
# The openvpn configuration is modified before the start, so the service is disabled by default
# and the ynh-vpnclient service handles it.
sudo yunohost service add openvpn
sudo yunohost service stop openvpn
sudo yunohost service disable openvpn

sudo yunohost service add php5-fpm
sudo yunohost service enable php5-fpm
sudo yunohost service stop php5-fpm
sudo yunohost service start php5-fpm

sudo yunohost service add ynh-vpnclient
sudo yunohost service enable ynh-vpnclient

if [ ! -z "${crt_server_ca_path}" ]; then
  sudo service ynh-vpnclient start
fi

sudo service nginx reload

# Update SSO for vpnadmin
sudo yunohost app ssowatconf

# Restart hotspot service if installed (and started) to change NAT configuration (now on tun0)
# A new start will fix the interface without unsetting all stuff
if [ -e /tmp/.ynh-hotspot-started ]; then
  sudo service ynh-hotspot start
fi

# Check configuration consistency

if [ -z "${crt_server_ca_path}" ]; then
  echo "WARNING: VPN Client is not started because you need to define a server CA through the web admin" >&2
fi

if [ -z "${crt_client_key_path}" -a -z "${login_user}" ]; then
  echo "WARNING: VPN Client is not started because you need either a client certificate, either a username (or both)" >&2
fi

exit 0