#!/usr/bin/env bash
source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
source "$PLUGIN_CORE_AVAILABLE_PATH/certs/functions"
source "$PLUGIN_CORE_AVAILABLE_PATH/domains/functions"
source "$PLUGIN_CORE_AVAILABLE_PATH/nginx-vhosts/functions"
if [[ -f "$PLUGIN_CORE_AVAILABLE_PATH/nginx-vhosts/internal-functions" ]]; then
  source "$PLUGIN_CORE_AVAILABLE_PATH/nginx-vhosts/internal-functions"
fi
source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/config"
set -eo pipefail
[[ $DOKKU_TRACE ]] && set -x

fn-letsencrypt-acme-execute-challenge() {
  declare desc="perform actual ACME validation procedure"
  declare APP="$1"
  local FAKE_NGINX_CONF=false
  local challenge_mode config_dir

  if [[ ! -f "$DOKKU_ROOT/$APP/nginx.conf" ]]; then
    FAKE_NGINX_CONF=true
  fi

  fn-letsencrypt-create-root "$APP"

  challenge_mode="HTTP-01"
  dns_provider="$(fn-letsencrypt-computed-dns-provider "$APP")"
  if [[ -n "$dns_provider" ]]; then
    challenge_mode="DNS-01"
  fi

  dokku_log_info1 "Getting letsencrypt certificate for ${APP} via ${challenge_mode}"

  # read arguments from appropriate config file into the config array
  config_dirs="$(fn-letsencrypt-configure-and-get-dir "$APP")"
  host_config_dir="$(echo "$config_dirs" | cut -d: -f1)"
  container_config_dir="$(echo "$config_dirs" | cut -d: -f2)"
  read -r -a config <"$container_config_dir/config"

  # run letsencrypt as a docker container using "certonly" mode
  # port 80 of the standalone webserver will be forwarded by the proxy
  set +e
  export DOKKU_UID=$(id -u)
  export DOKKU_GID=$(id -g)
  mkdir -p "$DOKKU_LIB_ROOT/data/letsencrypt/$APP"
  docker run --rm \
    --env-file "$host_config_dir/docker.env" \
    --user $DOKKU_UID:$DOKKU_GID \
    -v "$host_config_dir:/certs" \
    -v "$DOKKU_LIB_ROOT/data/letsencrypt/$APP:/webroot" \
    "${PLUGIN_IMAGE}:${PLUGIN_IMAGE_VERSION}" \
    "${config[@]}" run | sed "s/^/       /"

  local exit_code=$?
  set -e

  if [[ "$FAKE_NGINX_CONF" == "true" ]]; then
    rm "$DOKKU_ROOT/$APP/nginx.conf"
  fi

  if [[ $exit_code != 0 ]]; then
    dokku_log_info1 "Certificate retrieval failed!"
    return $exit_code
  fi

  # got certificate
  dokku_log_info1 "Certificate retrieved successfully."
  fn-letsencrypt-symlink-certs "$APP" "$container_config_dir"
  plugn trigger proxy-build-config "$APP"
}

fn-letsencrypt-acme-revoke() {
  declare desc="perform actual certificate revocation"
  local APP="$1"

  fn-letsencrypt-create-root "$APP"

  challenge_mode="HTTP-01"
  dns_provider="$(fn-letsencrypt-computed-dns-provider "$APP")"
  if [[ -n "$dns_provider" ]]; then
    challenge_mode="DNS-01"
  fi

  dokku_log_info1 "Revoking letsencrypt certificate for ${APP} via ${challenge_mode}"
  local acme_port="$(plugn trigger ports-get-available)"
  if [[ -z "$acme_port" ]]; then
    acme_port="$(get_available_port)"
  fi

  # read arguments from appropriate config file into the config array
  config_dirs="$(fn-letsencrypt-configure-and-get-dir "$APP")"
  host_config_dir="$(echo "$config_dirs" | cut -d: -f1)"
  container_config_dir="$(echo "$config_dirs" | cut -d: -f2)"
  read -r -a config <"$container_config_dir/config"

  # run letsencrypt as a docker container using "certonly" mode
  # port 80 of the standalone webserver will be forwarded by the proxy
  set +e
  export DOKKU_UID=$(id -u)
  export DOKKU_GID=$(id -g)
  mkdir -p "$DOKKU_LIB_ROOT/data/letsencrypt/$APP"
  docker run --rm \
    --env-file "$host_config_dir/docker.env" \
    --user $DOKKU_UID:$DOKKU_GID \
    -p "$acme_port:$acme_port" \
    -v "$host_config_dir:/certs" \
    -v "$DOKKU_LIB_ROOT/data/letsencrypt/$APP:/webroot" \
    "${PLUGIN_IMAGE}:${PLUGIN_IMAGE_VERSION}" \
    "${config[@]}" revoke | sed "s/^/       /"

  local exit_code=$?
  set -e

  # handle return codes
  if [[ $exit_code == 0 ]]; then
    # certificate revoked
    dokku_log_info1 "Certificate revoked successfully."
  else
    # error - don't try to link certificates
    dokku_log_info1 "Certificate revocation failed (code $simple_result)!"
    return
  fi

  local domain="$(get_app_domains "$APP" | xargs | awk '{print $1}')"

  # removing the certificate will automatically reconfigure nginx
  if [[ -z $DOKKU_APP_NAME ]]; then
    dokku certs:remove "$APP"
  else
    dokku certs:remove
  fi
}

fn-letsencrypt-acme-proxy-disable() {
  declare desc="disable ACME proxy for an app"
  local APP="$1"

  local app_root="$DOKKU_ROOT/$APP"
  local app_config_dir="$app_root/nginx.conf.d"

  dokku_log_info1 "Disabling ACME proxy for $APP..."

  [[ -f "$app_config_dir/letsencrypt.conf" ]] && rm "$app_config_dir/letsencrypt.conf"

  restart_nginx | sed "s/^/       /"
}

fn-letsencrypt-acme-proxy-enable() {
  declare desc="enable ACME proxy for an app"
  local APP="$1"

  local app_root="$DOKKU_ROOT/$APP"
  local app_config_dir="$app_root/nginx.conf.d"

  dokku_log_info1 "Enabling ACME proxy for ${APP}..."

  # ensure the nginx.conf.d directory exists
  [[ -d "$app_config_dir" ]] || mkdir "$app_config_dir"

  # generate letsencrypt config
  sigil -f "$PLUGIN_AVAILABLE_PATH/letsencrypt/templates/letsencrypt.conf.sigil" \
    APP="$APP" \
    DOKKU_LIB_ROOT="$DOKKU_LIB_ROOT" \
    >"$app_config_dir/letsencrypt.conf"

  restart_nginx | sed "s/^/       /"
}

fn-letsencrypt-computed-dns-provider() {
  declare desc="get configured dns provider"
  declare APP="$1"

  value="$(fn-letsencrypt-dns-provider "$APP")"
  if [[ -z "$value" ]]; then
    value="$(fn-letsencrypt-global-dns-provider)"
  fi

  echo "$value"
}

fn-letsencrypt-global-dns-provider() {
  declare desc="get configured dns provider"

  fn-plugin-property-get-default "letsencrypt" "--global" "dns-provider" ""
}

fn-letsencrypt-dns-provider() {
  declare desc="get configured dns provider"
  declare APP="$1"

  fn-plugin-property-get-default "letsencrypt" "$APP" "dns-provider" ""
}

fn-letsencrypt-computed-lego-docker-args() {
  declare desc="get configured lego docker args"
  declare APP="$1"

  value="$(fn-letsencrypt-lego-docker-args "$APP")"
  if [[ -z "$value" ]]; then
    value="$(fn-letsencrypt-global-lego-docker-args)"
  fi

  echo "$value"
}

fn-letsencrypt-global-lego-docker-args() {
  declare desc="get configured lego docker args"

  fn-plugin-property-get-default "letsencrypt" "--global" "lego-docker-args" ""
}

fn-letsencrypt-lego-docker-args() {
  declare desc="get configured lego docker args"
  declare APP="$1"

  fn-plugin-property-get-default "letsencrypt" "$APP" "lego-docker-args" ""
}

fn-letsencrypt-check-email() {
  declare desc="Check if an e-mail address is provided globally or for the app"
  declare APP="$1"

  # check we have a valid e-mail address
  if [[ -z "$(fn-letsencrypt-computed-email "$APP")" ]]; then
    dokku_log_warn "ERROR: Cannot request a certificate without an e-mail address!"
    dokku_log_warn "  please provide your e-mail address using"
    dokku_log_warn "  dokku letsencrypt:set $APP email <e-mail>"
    return 1
  fi
}

fn-letsencrypt-configure-and-get-dir() {
  declare desc="assemble lego command line arguments and create a config hash directory for them"
  declare APP="$1"
  local config config_dir config_hash dns_provider domain_args domains email extra_args cert_timeout key server value

  local app_root="$DOKKU_ROOT/$APP"
  local le_root="$app_root/letsencrypt"
  mkdir -p "$DOKKU_ROOT/$APP/letsencrypt/account"

  # build up a string of all certificate-controlling configuration settings.
  # this will be used to determine the folder name for the account key and certificates

  # get the selected ACME server
  server="$(fn-letsencrypt-computed-server "$APP")"

  # construct domain arguments
  domains="$(get_app_domains "$APP")"
  domain_args=''
  for domain in $domains; do
    dokku_log_verbose " - Domain '$domain'" >&2
    domain_args="$domain_args --domains $domain"
  done

  # lego --cert.timeout is in seconds and defaults to 30
  cert_timeout=30
  email="$(fn-letsencrypt-computed-email "$APP")"
  extra_args="$(fn-letsencrypt-computed-lego-docker-args "$APP")"
  config="--pem --accept-tos --cert.timeout $cert_timeout --path /certs --server $server --email $email $extra_args $domain_args"

  dns_provider="$(fn-letsencrypt-computed-dns-provider "$APP")"
  if [[ -n "$dns_provider" ]]; then
    config="--dns $dns_provider $config"
  else
    config="--http --http.webroot /webroot $config"
  fi

  config_hash=$(echo "$config" | sha1sum | awk '{print $1}')
  config_dir="$le_root/certs/$config_hash"
  mkdir -p "$config_dir"

  rm -f "$config_dir/docker.env"
  touch "$config_dir/docker.env"
  if [[ -n "$dns_provider" ]]; then
    fn-plugin-property-get-all "letsencrypt" "--global" | while read -r line; do
      [[ -n "$line" ]] || continue
      key="$(cut -d" " -f1 <<<"$line")"
      if [[ "$key" == dns-provider-* ]]; then
        value="$(cut -d" " -f2 <<<"$line")"
        echo "${key#"dns-provider-"}=$value" >>"$config_dir/docker.env"
      fi
    done
    fn-plugin-property-get-all "letsencrypt" "$APP" | while read -r line; do
      [[ -n "$line" ]] || continue
      key="$(cut -d" " -f1 <<<"$line")"
      if [[ "$key" == dns-provider-* ]]; then
        value="$(cut -d" " -f2 <<<"$line")"
        echo "${key#"dns-provider-"}=$value" >>"$config_dir/docker.env"
      fi
    done
  fi

  # ensure the permissions are set correctly on anything that may expose api keys
  chmod 0755 "$config_dir/docker.env"

  # store config settings
  echo "$config" >"$config_dir/config"

  # send both host and container path
  # to respect mapped DOKKU_ROOT when running in a container
  echo "$DOKKU_HOST_ROOT/$APP/letsencrypt/certs/$config_hash:$config_dir"
}

fn-letsencrypt-cron-job-enabled() {
  declare desc="Check if the cron plugin is available"

  if [[ ! -f "$PLUGIN_AVAILABLE_PATH/cron/cron-write" ]]; then
    return 1
  fi
}

fn-letsencrypt-cron-job-add() {
  declare desc="Add auto-renew cronjob to dokku user's crontab"

  touch "${DOKKU_LIB_ROOT}/data/letsencrypt/autorenew"
  if fn-letsencrypt-cron-job-enabled; then
    plugn trigger cron-write
  else
    crons="$(crontab -l || true)"
    crons="$(grep -v -F "$LETSENCRYPT_CRON_CMD" <<<"$crons")"
    printf "%s\n%s\n" "$crons" "$LETSENCRYPT_CRON_JOB" | crontab -
  fi

  dokku_log_info1 "Added cron job to dokku's crontab."
}

fn-letsencrypt-cron-job-remove() {
  declare desc="Remove auto-renew cronjob from dokku user's crontab"

  rm -f "${DOKKU_LIB_ROOT}/data/letsencrypt/autorenew"
  if fn-letsencrypt-cron-job-enabled; then
    plugn trigger cron-write
  else
    crons="$(crontab -l || true)"
    crons="$(grep -v -F "$LETSENCRYPT_CRON_CMD" <<<"$crons")"
    printf "%s" "$crons" | crontab -
  fi
  dokku_log_info1 "Removed cron job from dokku's crontab."
}

fn-letsencrypt-create-root() {
  declare desc="Ensure the let's encrypt root directory exists"
  declare APP="$1"
  local NGINX_ACCESS_LOG_FORMAT NGINX_ACCESS_LOG_PATH NGINX_ERROR_LOG_PATH

  local app_root="$DOKKU_ROOT/$APP"
  local le_root="$app_root/letsencrypt"

  mkdir -p "$le_root"

  if [[ ! -f "$DOKKU_ROOT/$APP/nginx.conf" ]]; then
    dokku_log_info1 "Setting temporary site"
    NGINX_ACCESS_LOG_FORMAT="$(fn-nginx-access-log-format "$APP")"
    NGINX_ACCESS_LOG_PATH="$(fn-nginx-access-log-path "$APP")"
    NGINX_ERROR_LOG_PATH="$(fn-nginx-error-log-path "$APP")"
    if [[ -z "$NGINX_ACCESS_LOG_FORMAT" ]]; then
      NGINX_ACCESS_LOG_FORMAT="$(fn-nginx-computed-access-log-format "$APP")"
    fi
    if [[ -z "$NGINX_ACCESS_LOG_PATH" ]]; then
      NGINX_ACCESS_LOG_PATH="$(fn-nginx-computed-access-log-path "$APP")"
    fi
    if [[ -z "$NGINX_ERROR_LOG_PATH" ]]; then
      NGINX_ERROR_LOG_PATH="$(fn-nginx-computed-error-log-path "$APP")"
    fi

    sigil -f "$PLUGIN_AVAILABLE_PATH/letsencrypt/templates/default-nginx.conf.sigil" \
      DOMAINS="$(get_app_domains "$APP" | xargs)" DOKKU_ROOT="$DOKKU_ROOT" APP="$APP" \
      NGINX_ACCESS_LOG_FORMAT="$NGINX_ACCESS_LOG_FORMAT" NGINX_ACCESS_LOG_PATH="$NGINX_ACCESS_LOG_PATH" \
      NGINX_ERROR_LOG_PATH="$NGINX_ERROR_LOG_PATH" \
      >"$DOKKU_ROOT/$APP/nginx.conf"
    restart_nginx | sed "s/^/       /"
  fi
}

fn-letsencrypt-is-autorenew-enabled() {
  declare desc="check if autorenew is enabled"
  local enabled=false

  if [[ -f "${DOKKU_LIB_ROOT}/data/letsencrypt/autorenew" ]]; then
    enabled=true
  fi

  echo "$enabled"
}

fn-letsencrypt-computed-email() {
  declare desc="get configured email address"
  declare APP="$1"

  value="$(fn-letsencrypt-email "$APP")"
  if [[ -z "$value" ]]; then
    value="$(fn-letsencrypt-global-email)"
  fi

  echo "$value"
}

fn-letsencrypt-global-email() {
  declare desc="get configured email address"

  fn-plugin-property-get-default "letsencrypt" "--global" "email" ""
}

fn-letsencrypt-email() {
  declare desc="get configured email address"
  declare APP="$1"

  fn-plugin-property-get-default "letsencrypt" "$APP" "email" ""
}

fn-letsencrypt-enable() {
  declare APP="$1"
  local EXIT_CODE=0
  local domain

  verify_app_name "$APP"

  domain="$(get_app_domains "$APP" | xargs | awk '{print $1}')"
  if [[ -z "$domain" ]]; then
    dokku_log_warn "No domains detected for $APP"
    return 1
  fi

  dokku_log_info2 "Enabling letsencrypt for $APP"

  fn-letsencrypt-check-email "$APP"
  fn-letsencrypt-acme-proxy-enable "$APP"
  fn-letsencrypt-acme-execute-challenge "$APP" || EXIT_CODE=$? # remove ACME proxy even if this fails
  fn-letsencrypt-acme-proxy-disable "$APP"

  if [[ "$EXIT_CODE" == 0 ]]; then
    dokku_log_info1 "Done"
    return
  fi

  dokku_log_warn "Failed to setup letsencrypt"
  DOKKU_FAIL_EXIT_CODE="$EXIT_CODE" dokku_log_fail "Check log output for further information on failure"
}

fn-letsencrypt-expiration() {
  declare desc="prints expiration time"
  declare APP="$1"

  if [[ -f "$DOKKU_ROOT/$APP/tls/server.letsencrypt.crt" ]]; then
    date -u -d "$(openssl x509 -in "$DOKKU_ROOT/$APP/tls/server.letsencrypt.crt" -enddate -noout | sed -e "s/^notAfter=//")" "+%s"
  else
    date -u -d "$(openssl x509 -in "$DOKKU_ROOT/$APP/tls/server.crt" -enddate -noout | sed -e "s/^notAfter=//")" "+%s"
  fi
}

fn-letsencrypt-computed-graceperiod() {
  declare desc="get configured graceperiod"
  declare APP="$1"
  local value

  value="$(fn-letsencrypt-graceperiod "$APP")"
  if [[ -z "$value" ]]; then
    value="$(fn-letsencrypt-global-graceperiod)"
  fi

  if [[ -z "$value" ]]; then
    value="$((60 * 60 * 24 * 30))"
  fi

  echo "$value"
}

fn-letsencrypt-global-graceperiod() {
  declare desc="get configured graceperiod"

  fn-plugin-property-get-default "letsencrypt" "--global" "graceperiod" ""
}

fn-letsencrypt-graceperiod() {
  declare desc="get configured graceperiod"
  declare APP="$1"

  fn-plugin-property-get-default "letsencrypt" "$APP" "graceperiod" ""
}

fn-letsencrypt-format-timediff() {
  declare desc="format a time difference in seconds into a human-readable string"
  local td="$1"
  local negative_td=0

  if [ "$td" -lt 0 ]; then
    negative_td=1
    td=$((-td))
  fi

  local days=$((td / (24 * 60 * 60)))
  td=$((td % (24 * 60 * 60)))

  local hours=$((td / (60 * 60)))
  td=$((td % (60 * 60)))

  local minutes=$((td / 60))
  local secs=$((td % 60))

  local res=""
  if [ $days -gt 0 ]; then
    res="${days}d, "
  fi

  if [ $hours -gt 0 ]; then
    res="${res}${hours}h, "
  fi

  if [ $minutes -gt 0 ]; then
    res="${res}${minutes}m, "
  fi

  if [ $secs -gt 0 ]; then
    res="${res}${secs}s, "
  fi

  # remove trailing comma
  res="$(echo "$res" | sed -re 's/, ?$//g')"

  if [[ $negative_td == 1 ]]; then
    res="${res} ago"
  fi

  echo "$res"
}

fn-letsencrypt-is-active() {
  declare desc="outputs true if active, false otherwise"
  declare APP=$1
  local domain

  # check if SSL is enabled on per-app level
  if ! is_ssl_enabled "$APP"; then
    echo "false"
    return
  fi

  domain="$(get_app_domains "$APP" | xargs | awk '{print $1}')"

  # check if certificate is identical to the current let's encrypt certificate by comparing SHA1 hashes
  local cert_sha1
  if [[ -f "$DOKKU_ROOT/$APP/tls/server.letsencrypt.crt" ]]; then
    cert_sha1=$( (cat "$DOKKU_ROOT/$APP/tls/server.letsencrypt.crt" 2>/dev/null) | sha1sum || echo "not_found")
  else
    cert_sha1=$( (cat "$DOKKU_ROOT/$APP/tls/server.crt" 2>/dev/null) | sha1sum || echo "not_found")
  fi

  local le_sha1="not_found"
  local fileSafeDomain
  fileSafeDomain="${domain/\*/_}" # wildcards are using *.example.com which have certificates named _.example.com
  if [[ -f "$DOKKU_ROOT/$APP/letsencrypt/certs/current/certificates/$fileSafeDomain.pem" ]]; then
    le_sha1=$( (cat "$DOKKU_ROOT/$APP/letsencrypt/certs/current/certificates/$fileSafeDomain.crt" 2>/dev/null) | sha1sum || echo "not_found")
  elif [[ -f "$DOKKU_ROOT/$APP/letsencrypt/certs/current/fullchain.pem" ]]; then
    le_sha1=$( (cat "$DOKKU_ROOT/$APP/letsencrypt/certs/current/fullchain.pem" 2>/dev/null) | sha1sum || echo "not_found")
  fi

  if [[ "$cert_sha1" != "$le_sha1" ]]; then
    echo "false"
    return
  fi

  echo "true"
}

fn-letsencrypt-list-apps-with-expiry() {
  declare desc="list all letsencrypt-secured apps together with their expiry date"

  # prints a tab-separated list of
  #  * app name
  #  * expiry dates as UNIX timestamp (seconds since epoch)
  #  * selected renewal grace period (in seconds)
  #  * time left on certificate (in seconds)
  #  * time until renewal (in seconds)

  for APP in $(dokku_apps); do
    if [[ "$APP" == "=====>" ]] || [[ "$APP" == "My" ]] || [[ "$APP" == "Apps" ]]; then continue; fi
    if [[ "$(fn-letsencrypt-is-active "$APP")" == "true" ]]; then
      local expiry=$(fn-letsencrypt-expiration "$APP")
      local grace_period="$(fn-letsencrypt-computed-graceperiod "$APP")"
      local time_to_expiry=$((expiry - $(date +%s)))
      local time_to_renewal=$((expiry - grace_period - $(date +%s)))
      echo -e "$APP\t$expiry\t$grace_period\t$time_to_expiry\t$time_to_renewal"
    fi
  done
}

fn-letsencrypt-computed-server() {
  declare desc="get configured server"
  declare APP="$1"

  value="$(fn-letsencrypt-server "$APP")"
  if [[ -z "$value" ]]; then
    value="$(fn-letsencrypt-global-server)"
  fi

  if [[ -z "$value" ]] || [[ "$value" == "default" ]]; then
    value="https://acme-v02.api.letsencrypt.org/directory"
  elif [[ "$value" == "staging" ]]; then
    value="https://acme-staging-v02.api.letsencrypt.org/directory"
  fi

  echo "$value"
}

fn-letsencrypt-global-server() {
  declare desc="get configured server"

  fn-plugin-property-get-default "letsencrypt" "--global" "server" ""
}

fn-letsencrypt-server() {
  declare desc="get configured server"
  declare APP="$1"

  fn-plugin-property-get-default "letsencrypt" "$APP" "server" ""
}

fn-letsencrypt-symlink-certs() {
  declare desc="symlink let's encrypt certificates so they can be found by dokku"
  declare APP="$1" config_dir="$2"

  local app_root="$DOKKU_ROOT/$APP"
  local le_root="$app_root/letsencrypt"
  local domain

  dokku_log_info1 "Installing let's encrypt certificates"

  # link the current config directory to 'current'
  ln -nsf "$config_dir" "$le_root/certs/current"

  # install the let's encrypt certificate for the app
  unset DOKKU_APP_NAME
  domain="$(get_app_domains "$APP" | xargs | awk '{print $1}')"
  local fileSafeDomain
  fileSafeDomain="${domain/\*/_}" # wildcards are using *.example.com which have certificates named _.example.com
  dokku certs:add "$APP" "$config_dir/certificates/$fileSafeDomain.pem" "$config_dir/certificates/$fileSafeDomain.key"
  rm -f "$app_root/tls/server.letsencrypt.crt" "$app_root/tls/server.crt"
  cp "$config_dir/certificates/$fileSafeDomain.crt" "$app_root/tls/server.letsencrypt.crt"
  cp "$config_dir/certificates/$fileSafeDomain.crt" "$app_root/tls/server.crt"
}