#!/usr/bin/env sh

# Here is a script to deploy cert to routeros router.
# Deploy the cert to remote routeros
#
# ```sh
# acme.sh --deploy -d ftp.example.com --deploy-hook routeros
# ```
#
# Before you can deploy the certificate to router os, you need
# to add the id_rsa.pub key to the routeros and assign a user
# to that key.
#
# The user need to have access to ssh, ftp, read and write.
#
# There are no need to enable ftp service for the script to work,
# as they are transmitted over SCP, however ftp is needed to store
# the files on the router.
#
# Then you need to set the environment variables for the
# deploy script to work.
#
# ```sh
# export ROUTER_OS_USERNAME=certuser
# export ROUTER_OS_HOST=router.example.com
# export ROUTER_OS_PORT=22
#
# acme.sh --deploy -d ftp.example.com --deploy-hook routeros
# ```
#
# The deploy script will remove previously deployed certificates,
# and it does this with an assumption on how RouterOS names imported
# certificates, adding a "cer_0" suffix at the end. This is true for
# versions 6.32 -> 6.41.3, but it is not guaranteed that it will be
# true for future versions when upgrading.
#
# If the router have other certificates with the same name as the one
# beeing deployed, then this script will remove those certificates.
#
# At the end of the script, the services that use those certificates
# could be updated. Currently only the www-ssl service is beeing
# updated, but more services could be added.
#
# For instance:
# ```sh
# export ROUTER_OS_ADDITIONAL_SERVICES="/ip service set api-ssl certificate=$_cdomain.cer_0"
# ```
#
# One optional thing to do as well is to create a script that updates
# all the required services and run that script in a single command.
#
# To adopt parameters to `scp` and/or `ssh` set the optional
# `ROUTER_OS_SSH_CMD` and `ROUTER_OS_SCP_CMD` variables accordingly,
# see ssh(1) and scp(1) for parameters to those commands.
#
# Example:
# ```ssh
# export ROUTER_OS_SSH_CMD="ssh -i /acme.sh/.ssh/router.example.com -o UserKnownHostsFile=/acme.sh/.ssh/known_hosts"
# export ROUTER_OS_SCP_CMD="scp -i /acme.sh/.ssh/router.example.com -o UserKnownHostsFile=/acme.sh/.ssh/known_hosts"
# ````
#
# returns 0 means success, otherwise error.

########  Public functions #####################

#domain keyfile certfile cafile fullchain
routeros_deploy() {
  _cdomain="$1"
  _ckey="$2"
  _ccert="$3"
  _cca="$4"
  _cfullchain="$5"
  _err_code=0

  _debug _cdomain "$_cdomain"
  _debug _ckey "$_ckey"
  _debug _ccert "$_ccert"
  _debug _cca "$_cca"
  _debug _cfullchain "$_cfullchain"

  _getdeployconf ROUTER_OS_HOST

  if [ -z "$ROUTER_OS_HOST" ]; then
    _debug "Using _cdomain as ROUTER_OS_HOST, please set if not correct."
    ROUTER_OS_HOST="$_cdomain"
  fi

  _getdeployconf ROUTER_OS_USERNAME

  if [ -z "$ROUTER_OS_USERNAME" ]; then
    _err "Need to set the env variable ROUTER_OS_USERNAME"
    return 1
  fi

  _getdeployconf ROUTER_OS_PORT

  if [ -z "$ROUTER_OS_PORT" ]; then
    _debug "Using default port 22 as ROUTER_OS_PORT, please set if not correct."
    ROUTER_OS_PORT=22
  fi

  _getdeployconf ROUTER_OS_SSH_CMD

  if [ -z "$ROUTER_OS_SSH_CMD" ]; then
    _debug "Use default ssh setup."
    ROUTER_OS_SSH_CMD="ssh -p $ROUTER_OS_PORT"
  fi

  _getdeployconf ROUTER_OS_SCP_CMD

  if [ -z "$ROUTER_OS_SCP_CMD" ]; then
    _debug "USe default scp setup."
    ROUTER_OS_SCP_CMD="scp -P $ROUTER_OS_PORT"
  fi

  _getdeployconf ROUTER_OS_ADDITIONAL_SERVICES

  if [ -z "$ROUTER_OS_ADDITIONAL_SERVICES" ]; then
    _debug "Not enabling additional services"
    ROUTER_OS_ADDITIONAL_SERVICES=""
  fi

  _savedeployconf ROUTER_OS_HOST "$ROUTER_OS_HOST"
  _savedeployconf ROUTER_OS_USERNAME "$ROUTER_OS_USERNAME"
  _savedeployconf ROUTER_OS_PORT "$ROUTER_OS_PORT"
  _savedeployconf ROUTER_OS_SSH_CMD "$ROUTER_OS_SSH_CMD"
  _savedeployconf ROUTER_OS_SCP_CMD "$ROUTER_OS_SCP_CMD"
  _savedeployconf ROUTER_OS_ADDITIONAL_SERVICES "$ROUTER_OS_ADDITIONAL_SERVICES"

  # push key to routeros
  if ! _scp_certificate "$_ckey" "$ROUTER_OS_USERNAME@$ROUTER_OS_HOST:$_cdomain.key"; then
    return $_err_code
  fi

  # push certificate chain to routeros
  if ! _scp_certificate "$_cfullchain" "$ROUTER_OS_USERNAME@$ROUTER_OS_HOST:$_cdomain.cer"; then
    return $_err_code
  fi

  DEPLOY_SCRIPT_CMD="/system script add name=\"LE Cert Deploy - $_cdomain\" owner=$ROUTER_OS_USERNAME \
comment=\"generated by routeros deploy script in acme.sh\" \
source=\"/certificate remove [ find name=$_cdomain.cer_0 ];\
\n/certificate remove [ find name=$_cdomain.cer_1 ];\
\n/certificate remove [ find name=$_cdomain.cer_2 ];\
\ndelay 1;\
\n/certificate import file-name=$_cdomain.cer passphrase=\\\"\\\";\
\n/certificate import file-name=$_cdomain.key passphrase=\\\"\\\";\
\ndelay 1;\
\n/file remove $_cdomain.cer;\
\n/file remove $_cdomain.key;\
\ndelay 2;\
\n/ip service set www-ssl certificate=$_cdomain.cer_0;\
\n$ROUTER_OS_ADDITIONAL_SERVICES;\
\n\"
"

  if ! _ssh_remote_cmd "$DEPLOY_SCRIPT_CMD"; then
    return $_err_code
  fi

  if ! _ssh_remote_cmd "/system script run \"LE Cert Deploy - $_cdomain\""; then
    return $_err_code
  fi

  if ! _ssh_remote_cmd "/system script remove \"LE Cert Deploy - $_cdomain\""; then
    return $_err_code
  fi

  return 0
}

# inspired by deploy/ssh.sh
_ssh_remote_cmd() {
  _cmd="$1"
  _secure_debug "Remote commands to execute: $_cmd"
  _info "Submitting sequence of commands to routeros"
  # quotations in bash cmd below intended.  Squash travis spellcheck error
  # shellcheck disable=SC2029
  $ROUTER_OS_SSH_CMD "$ROUTER_OS_USERNAME@$ROUTER_OS_HOST" "$_cmd"
  _err_code="$?"

  if [ "$_err_code" != "0" ]; then
    _err "Error code $_err_code returned from routeros"
  fi

  return $_err_code
}

_scp_certificate() {
  _src="$1"
  _dst="$2"
  _secure_debug "scp '$_src' to '$_dst'"
  _info "Push key '$_src' to routeros"

  $ROUTER_OS_SCP_CMD "$_src" "$_dst"
  _err_code="$?"

  if [ "$_err_code" != "0" ]; then
    _err "Error code $_err_code returned from scp"
  fi

  return $_err_code
}