#!/bin/bash

#=================================================
# GENERIC START
#=================================================
# IMPORT GENERIC HELPERS
#=================================================

source _common.sh
source /usr/share/yunohost/helpers

#=================================================
# MANAGE SCRIPT FAILURE
#=================================================

# Exit if an error occurs during the execution of the script
ynh_abort_if_errors

#=================================================
# RETRIEVE ARGUMENTS FROM THE MANIFEST
#=================================================
export app=$YNH_APP_INSTANCE_NAME
export final_path="/opt/yunohost/${app}"

# Retrieve arguments
ynh_export server port ssh_user backup_path passphrase on_calendar check_on_calendar check_read_data_on_calendar conf data apps allow_extra_space_use

#=================================================
# STORE SETTINGS FROM MANIFEST
#=================================================
ynh_save_args server port ssh_user backup_path passphrase on_calendar check_on_calendar check_read_data_on_calendar conf data apps allow_extra_space_use

#=================================================
# INSTALL RESTIC
#=================================================
ynh_script_progression --message="Installing restic binary" --weight=7
install_restic

#=================================================
# CREATE APP USER
#=================================================
ynh_script_progression --message="Creating user ${app}"
useradd -m ${app}
ynh_script_progression --message="Configure ${app} user sudoer rights"
cat > /tmp/${app}_sudoer << EOSUDOER
${app} ALL = (root) NOPASSWD: /usr/bin/yunohost*, /bin/journalctl*
EOSUDOER
visudo -cf /tmp/${app}_sudoer && mv /tmp/${app}_sudoer /etc/sudoers.d/${app}

#=================================================
# ACTIVATE BACKUP METHODS
#=================================================
ynh_script_progression --message="Activating backup methods"
mkdir -p /etc/yunohost/hooks.d/backup_method
mkdir -p /usr/share/yunohost/backup_method

#=================================================
# SETUP THE BACKUP METHOD
#=================================================
ynh_script_progression --message="Setting up backup methods"
ynh_configure backup_method "/etc/yunohost/hooks.d/backup_method/05-${app}_app"
ynh_configure check_method "${final_path}/check_method_${app}"

#=================================================
# SETUP LOG SCRIPT
#=================================================
ynh_script_progression --message="Setting up log script"
ynh_configure restic_log "${final_path}/restic_log_${app}"
chmod u+x "${final_path}/restic_log_${app}"
chown ${app}: "${final_path}/restic_log_${app}"

#=================================================
# CONFIGURE CRON
#=================================================
ynh_script_progression --message="Configuring cron" --weight=5
ynh_configure backup-with-restic "/usr/local/bin/backup-with-${app}"
ynh_configure check-restic "${final_path}/check-${app}"
chmod u+x "/usr/local/bin/backup-with-${app}"
chown ${app}: "/usr/local/bin/backup-with-${app}"
chmod u+x "${final_path}/check-${app}"
chmod u+x "${final_path}/check_method_${app}"
ynh_add_systemd_config --service=${app} --template=systemd.service
ynh_add_systemd_config --service=${app}_check --template=systemd_check.service
ynh_add_systemd_config --service=${app}_check_read_data --template=systemd_check_read_data.service
ynh_configure systemd.timer "/etc/systemd/system/${app}.timer"
ynh_configure systemd_check.timer "/etc/systemd/system/${app}_check.timer"
ynh_configure systemd_check_read_data.timer "/etc/systemd/system/${app}_check_read_data.timer"
systemctl disable --quiet ${app}.service
systemctl disable --quiet ${app}_check.service
systemctl disable --quiet ${app}_check_read_data.service
systemctl enable --quiet ${app}.timer
systemctl enable --quiet ${app}_check.timer
systemctl enable --quiet ${app}_check_read_data.timer
systemctl start ${app}.timer
systemctl start ${app}_check.timer
systemctl start ${app}_check_read_data.timer

#=================================================
# SET PERMISSIONS ON FINAL PATH
#=================================================
ynh_script_progression --message="Set permissions on ${final_path}"
chown -R ${app}: ${final_path}

#=================================================
# GENERATE SSH KEY
#=================================================
ynh_script_progression --message="Generating private key"
ssh_dir="/root/.ssh"
if [ ! -d "${ssh_dir}" ];then
  mkdir -p "${ssh_dir}"
fi
private_key="${ssh_dir}/id_${app}_ed25519"
test -f $private_key || ssh-keygen -q -t ed25519 -N "" -f $private_key

#=================================================
# GENERATE SSH CONFIG
#=================================================
ynh_script_progression --message="Generating ssh config for ${app} server ${server}"
grep -q "${app}" ${ssh_dir}/config 2>/dev/null || cat << EOCONF >> ${ssh_dir}/config
# begin $app ssh config
Host ${server}
  Hostname ${server}
  Port ${port}
  User ${ssh_user}
  IdentityFile ${private_key}
  StrictHostKeyChecking no
  UserKnownHostsFile /dev/null
# end $app ssh config
EOCONF

#=================================================
# Display key
#=================================================

ynh_script_progression --message="You should now allow the following public key for user ${ssh_user} on server ${server}:
$(cat ${private_key}.pub)"


#=================================================
# SEND A README FOR THE ADMIN
#=================================================
ynh_script_progression --message="Sending post-installation instructions to admin" --last
ynh_print_OFF
message="You should now allow the following public key for user ${ssh_user} on server ${server}:
$(cat ${private_key}.pub)

Do so by running those commands on ${server} with user ${ssh_user}:

mkdir ~/.ssh 2>/dev/null
touch ~/.ssh/authorized_keys
chmod u=rw,go= ~/.ssh/authorized_keys
cat << EOPKEY >> ~/.ssh/authorized_keys
$(cat ${private_key}.pub)
EOPKEY

$(if [ "$backup_path" != "./" ];then echo "Also make sure ${backup_path} exists and is writable by ${ssh_user}";fi)

If you're facing an issue or want to improve this app, please open a new issue in this project: https://github.com/YunoHost-Apps/restic_ynh"

ynh_send_readme_to_admin "$message" "root"
ynh_print_ON