#!/bin/bash

VER=1.0

PROJECT_NAME="ProxmoxACME"

USER_AGENT="$PROJECT_NAME/$VER"

DNS_PLUGIN_PATH="/usr/share/proxmox-acme/dnsapi"
HTTP_HEADER="$(mktemp)"

DEBUG="0"

_base64() {
  openssl base64 -e | tr -d '\r\n'
}

_dbase64() {
  openssl base64 -d
}

# Usage: hashalg  [outputhex]
# Output Base64-encoded digest
_digest() {
  alg="$1"

  if [ "$alg" = "sha256" ] || [ "$alg" = "sha1" ] || [ "$alg" = "md5" ]; then
    if [ "$2" ]; then
      openssl dgst -"$alg" -hex | cut -d = -f 2 | tr -d ' '
    else
      openssl dgst -"$alg" -binary | _base64
    fi
  fi
}

_usage() {
  __red "$@" >&2
  printf "\n" >&2
}

_upper_case() {
  # shellcheck disable=SC2018,SC2019
  tr 'a-z' 'A-Z'
}

_lower_case() {
  # shellcheck disable=SC2018,SC2019
  tr 'A-Z' 'a-z'
}

_startswith() {
  _str="$1"
  _sub="$2"
  echo "$_str" | grep "^$_sub" >/dev/null 2>&1
}

_endswith() {
  _str="$1"
  _sub="$2"
  echo "$_str" | grep -- "$_sub\$" >/dev/null 2>&1
}

_contains() {
  _str="$1"
  _sub="$2"
  echo "$_str" | grep -- "$_sub" >/dev/null 2>&1
}

# str index [sep]
_getfield() {
  _str="$1"
  _findex="$2"
  _sep="$3"

  if [ -z "$_sep" ]; then
    _sep=","
  fi

  _ffi="$_findex"
  while [ "$_ffi" -gt "0" ]; do
    _fv="$(echo "$_str" | cut -d "$_sep" -f "$_ffi")"
    if [ "$_fv" ]; then
      printf -- "%s" "$_fv"
      return 0
    fi
    _ffi="$(_math "$_ffi" - 1)"
  done

  printf -- "%s" "$_str"

}

_exists() {
  cmd="$1"
  if eval type type >/dev/null 2>&1; then
    type "$cmd" >/dev/null 2>&1
  else command
    command -v "$cmd" >/dev/null 2>&1
  fi
  ret="$?"
  return $ret
}

# a + b
_math() {
  _m_opts="$@"
  printf "%s" "$(($_m_opts))"
}

_egrep_o() {
  if ! egrep -o "$1" 2>/dev/null; then
    sed -n 's/.*\('"$1"'\).*/\1/p'
  fi
}

_h2b() {
  if _exists xxd; then
    if _contains "$(xxd --help 2>&1)" "assumes -c30"; then
      if xxd -r -p -c 9999 2>/dev/null; then
        return
      fi
    else
      if xxd -r -p 2>/dev/null; then
        return
      fi
    fi
  fi

  hex=$(cat)
  ic=""
  jc=""
  _debug2 _URGLY_PRINTF "$_URGLY_PRINTF"
  if [ -z "$_URGLY_PRINTF" ]; then
    if [ "$_ESCAPE_XARGS" ] && _exists xargs; then
      _debug2 "xargs"
      echo "$hex" | _upper_case | sed 's/\([0-9A-F]\{2\}\)/\\\\\\x\1/g' | xargs printf
    else
      for h in $(echo "$hex" | _upper_case | sed 's/\([0-9A-F]\{2\}\)/ \1/g'); do
        if [ -z "$h" ]; then
          break
        fi
        printf "\x$h%s"
      done
    fi
  else
    for c in $(echo "$hex" | _upper_case | sed 's/\([0-9A-F]\)/ \1/g'); do
      if [ -z "$ic" ]; then
        ic=$c
        continue
      fi
      jc=$c
      ic="$(_h_char_2_dec "$ic")"
      jc="$(_h_char_2_dec "$jc")"
      printf '\'"$(printf "%o" "$(_math "$ic" \* 16 + $jc)")""%s"
      ic=""
      jc=""
    done
  fi

}

#Usage: keyfile hashalg
#Output: Base64-encoded signature value
_sign() {
  keyfile="$1"
  alg="$2"
  if [ -z "$alg" ]; then
    _usage "Usage: _sign keyfile hashalg"
    return 1
  fi

  _sign_openssl="${ACME_OPENSSL_BIN:-openssl} dgst -sign $keyfile "

  if grep "BEGIN RSA PRIVATE KEY" "$keyfile" >/dev/null 2>&1 || grep "BEGIN PRIVATE KEY" "$keyfile" >/dev/null 2>&1; then
    $_sign_openssl -$alg | _base64
  elif grep "BEGIN EC PRIVATE KEY" "$keyfile" >/dev/null 2>&1; then
    if ! _signedECText="$($_sign_openssl -sha$__ECC_KEY_LEN | ${ACME_OPENSSL_BIN:-openssl} asn1parse -inform DER)"; then
      _err "Sign failed: $_sign_openssl"
      _err "Key file: $keyfile"
      _err "Key content:$(wc -l <"$keyfile") lines"
      return 1
    fi
    _debug3 "_signedECText" "$_signedECText"
    _ec_r="$(echo "$_signedECText" | _head_n 2 | _tail_n 1 | cut -d : -f 4 | tr -d "\r\n")"
    _ec_s="$(echo "$_signedECText" | _head_n 3 | _tail_n 1 | cut -d : -f 4 | tr -d "\r\n")"
    if [ "$__ECC_KEY_LEN" -eq "256" ]; then
      while [ "${#_ec_r}" -lt "64" ]; do
        _ec_r="0${_ec_r}"
      done
      while [ "${#_ec_s}" -lt "64" ]; do
        _ec_s="0${_ec_s}"
      done
    fi
    if [ "$__ECC_KEY_LEN" -eq "384" ]; then
      while [ "${#_ec_r}" -lt "96" ]; do
        _ec_r="0${_ec_r}"
      done
      while [ "${#_ec_s}" -lt "96" ]; do
        _ec_s="0${_ec_s}"
      done
    fi
    if [ "$__ECC_KEY_LEN" -eq "512" ]; then
      while [ "${#_ec_r}" -lt "132" ]; do
        _ec_r="0${_ec_r}"
      done
      while [ "${#_ec_s}" -lt "132" ]; do
        _ec_s="0${_ec_s}"
      done
    fi
    _debug3 "_ec_r" "$_ec_r"
    _debug3 "_ec_s" "$_ec_s"
    printf "%s" "$_ec_r$_ec_s" | _h2b | _base64
  else
    _err "Unknown key file format."
    return 1
  fi

}

#dummy function because proxmox-acme does not call inithttp
_resethttp() {
  :
}

_HTTP_MAX_RETRY=8

# body  url [needbase64] [POST|PUT|DELETE] [ContentType]
_post() {
  body="$1"
  _post_url="$2"
  needbase64="$3"
  httpmethod="$4"
  _postContentType="$5"
  _sleep_retry_sec=1
  _http_retry_times=0
  _hcode=0
  while [ "${_http_retry_times}" -le "$_HTTP_MAX_RETRY" ]; do
    [ "$_http_retry_times" = "$_HTTP_MAX_RETRY" ]
    _lastHCode="$?"
    _debug "Retrying post"
    _post_impl "$body" "$_post_url" "$needbase64" "$httpmethod" "$_postContentType" "$_lastHCode"
    _hcode="$?"
    _debug _hcode "$_hcode"
    if [ "$_hcode" = "0" ]; then
      break
    fi
    _http_retry_times=$(_math $_http_retry_times + 1)
    _sleep $_sleep_retry_sec
  done
  return $_hcode
}

# body  url [needbase64] [POST|PUT|DELETE] [ContentType] [displayError]
_post_impl() {
  body="$1"
  _post_url="$2"
  needbase64="$3"
  httpmethod="$4"
  _postContentType="$5"
  displayError="$6"

  if [ -z "$httpmethod" ]; then
    httpmethod="POST"
  fi

  _CURL="curl -L --silent --dump-header $HTTP_HEADER -g "
  if [ "$HTTPS_INSECURE" ]; then
    _CURL="$_CURL --insecure  "
  fi
  if [ "$httpmethod" = "HEAD" ]; then
    _CURL="$_CURL -I  "
  fi
  if [ "$needbase64" ]; then
    if [ "$body" ]; then
      if [ "$_postContentType" ]; then
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "Content-Type: $_postContentType" -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$_post_url" | _base64)"
      else
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$_post_url" | _base64)"
      fi
    else
      if [ "$_postContentType" ]; then
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "Content-Type: $_postContentType" -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" "$_post_url" | _base64)"
      else
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" "$_post_url" | _base64)"
      fi
    fi
  else
    if [ "$body" ]; then
      if [ "$_postContentType" ]; then
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "Content-Type: $_postContentType" -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$_post_url")"
      else
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$_post_url")"
      fi
    else
      if [ "$_postContentType" ]; then
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "Content-Type: $_postContentType" -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" "$_post_url")"
      else
        response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" "$_post_url")"
      fi
    fi
  fi
  _ret="$?"
  if [ "$_ret" != "0" ]; then
    if [ -z "$displayError" ] || [ "$displayError" = "0" ]; then
      _err "Please refer to https://curl.haxx.se/libcurl/c/libcurl-errors.html for error code: $_ret"
    fi
  fi
  printf "%s" "$response"
  return $_ret
}

# url getheader timeout
_get() {
  url="$1"
  onlyheader="$2"
  t="$3"
  _sleep_retry_sec=1
  _http_retry_times=0
  _hcode=0
  while [ "${_http_retry_times}" -le "$_HTTP_MAX_RETRY" ]; do
    [ "$_http_retry_times" = "$_HTTP_MAX_RETRY" ]
    _lastHCode="$?"
    _debug "Retrying GET"
    _get_impl "$url" "$onlyheader" "$t" "$_lastHCode"
    _hcode="$?"
    _debug _hcode "$_hcode"
    if [ "$_hcode" = "0" ]; then
      break
    fi
    _http_retry_times=$(_math $_http_retry_times + 1)
    _sleep $_sleep_retry_sec
  done
  return $_hcode
}

# url getheader timeout displayError
_get_impl() {
  url="$1"
  onlyheader="$2"
  t="$3"
  displayError="$4"

  _CURL="curl -L --silent --dump-header $HTTP_HEADER -g "
  if [ "$HTTPS_INSECURE" ]; then
    _CURL="$_CURL --insecure  "
  fi
  if [ "$t" ]; then
    _CURL="$_CURL --connect-timeout $t"
  fi
  if [ "$onlyheader" ]; then
    $_CURL -I --user-agent "USER_AGENT" -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" "$url"
  else
    $_CURL --user-agent "USER_AGENT" -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" "$url"
  fi
  ret=$?
  if [ "$ret" != "0" ]; then
    if [ -z "$displayError" ] || [ "$displayError" = "0" ]; then
      _err "Please refer to https://curl.haxx.se/libcurl/c/libcurl-errors.html for error code: $ret"
    fi
  fi
  return $ret
}

_head_n() {
  head -n "$1"
}

_tail_n() {
  tail -n "$1"
}

# stdin  output hexstr splited by one space
# input:"abc"
# output: " 61 62 63"
_hex_dump() {
  od -A n -v -t x1 | tr -s " " | sed 's/ $//' | tr -d "\r\t\n"
}

# stdin stdout
_url_encode() {
  _hex_str=$(_hex_dump)
  for _hex_code in $_hex_str; do
    #upper case
    case "${_hex_code}" in
      "41")
        printf "%s" "A"
        ;;
      "42")
        printf "%s" "B"
        ;;
      "43")
        printf "%s" "C"
        ;;
      "44")
        printf "%s" "D"
        ;;
      "45")
        printf "%s" "E"
        ;;
      "46")
        printf "%s" "F"
        ;;
      "47")
        printf "%s" "G"
        ;;
      "48")
        printf "%s" "H"
        ;;
      "49")
        printf "%s" "I"
        ;;
      "4a")
        printf "%s" "J"
        ;;
      "4b")
        printf "%s" "K"
        ;;
      "4c")
        printf "%s" "L"
        ;;
      "4d")
        printf "%s" "M"
        ;;
      "4e")
        printf "%s" "N"
        ;;
      "4f")
        printf "%s" "O"
        ;;
      "50")
        printf "%s" "P"
        ;;
      "51")
        printf "%s" "Q"
        ;;
      "52")
        printf "%s" "R"
        ;;
      "53")
        printf "%s" "S"
        ;;
      "54")
        printf "%s" "T"
        ;;
      "55")
        printf "%s" "U"
        ;;
      "56")
        printf "%s" "V"
        ;;
      "57")
        printf "%s" "W"
        ;;
      "58")
        printf "%s" "X"
        ;;
      "59")
        printf "%s" "Y"
        ;;
      "5a")
        printf "%s" "Z"
        ;;

      #lower case
      "61")
        printf "%s" "a"
        ;;
      "62")
        printf "%s" "b"
        ;;
      "63")
        printf "%s" "c"
        ;;
      "64")
        printf "%s" "d"
        ;;
      "65")
        printf "%s" "e"
        ;;
      "66")
        printf "%s" "f"
        ;;
      "67")
        printf "%s" "g"
        ;;
      "68")
        printf "%s" "h"
        ;;
      "69")
        printf "%s" "i"
        ;;
      "6a")
        printf "%s" "j"
        ;;
      "6b")
        printf "%s" "k"
        ;;
      "6c")
        printf "%s" "l"
        ;;
      "6d")
        printf "%s" "m"
        ;;
      "6e")
        printf "%s" "n"
        ;;
      "6f")
        printf "%s" "o"
        ;;
      "70")
        printf "%s" "p"
        ;;
      "71")
        printf "%s" "q"
        ;;
      "72")
        printf "%s" "r"
        ;;
      "73")
        printf "%s" "s"
        ;;
      "74")
        printf "%s" "t"
        ;;
      "75")
        printf "%s" "u"
        ;;
      "76")
        printf "%s" "v"
        ;;
      "77")
        printf "%s" "w"
        ;;
      "78")
        printf "%s" "x"
        ;;
      "79")
        printf "%s" "y"
        ;;
      "7a")
        printf "%s" "z"
        ;;

      #numbers
      "30")
        printf "%s" "0"
        ;;
      "31")
        printf "%s" "1"
        ;;
      "32")
        printf "%s" "2"
        ;;
      "33")
        printf "%s" "3"
        ;;
      "34")
        printf "%s" "4"
        ;;
      "35")
        printf "%s" "5"
        ;;
      "36")
        printf "%s" "6"
        ;;
      "37")
        printf "%s" "7"
        ;;
      "38")
        printf "%s" "8"
        ;;
      "39")
        printf "%s" "9"
        ;;
      "2d")
        printf "%s" "-"
        ;;
      "5f")
        printf "%s" "_"
        ;;
      "2e")
        printf "%s" "."
        ;;
      "7e")
        printf "%s" "~"
        ;;

      #other hex
      *)
        printf '%%%s' "$_hex_code"
        ;;
    esac
  done
}

# Usage: hashalg  secret_hex  [outputhex]
# Output binary hmac
_hmac() {
  alg="$1"
  secret_hex="$2"
  outputhex="$3"

  if [ "$alg" = "sha256" ] || [ "$alg" = "sha1" ]; then
    if [ "$outputhex" ]; then
      (openssl dgst -"$alg" -mac HMAC -macopt "hexkey:$secret_hex" 2>/dev/null || openssl dgst -"$alg" -hmac "$(printf "%s" "$secret_hex" | _h2b)") | cut -d = -f 2 | tr -d ' '
    else
      openssl dgst -"$alg" -mac HMAC -macopt "hexkey:$secret_hex" -binary 2>/dev/null || openssl dgst -"$alg" -hmac "$(printf "%s" "$secret_hex" | _h2b)" -binary
    fi
  fi
}

# domain
_is_idn() {
  _is_idn_d="$1"
  _idn_temp=$(printf "%s" "$_is_idn_d" | tr -d '0-9' | tr -d 'a-z' | tr -d 'A-Z' | tr -d '*.,-_')
  [ "$_idn_temp" ]
}

# aa.com
_idn() {
  __idn_d="$1"
  if ! _is_idn "$__idn_d"; then
    printf "%s" "$__idn_d"
    return 0
  fi

  if _exists idn; then
    idn "$__idn_d" | tr -d "\r\n"
  else
    _err "Please install idn to process IDN names."
  fi
}

_normalizeJson() {
  sed "s/\" *: *\([\"{\[]\)/\":\1/g" | sed "s/^ *\([^ ]\)/\1/" | tr -d "\r\n"
}

# options file
_sed_i() {
  sed -i "$1" "$2"
}

# sleep sec
_sleep() {
  sleep "$1"
}

_stat() {
  stat -c '%U:%G' "$1" 2>/dev/null
}

_time() {
  date -u "+%s"
}

_utc_date() {
  date -u "+%Y-%m-%d %H:%M:%S"
}

# stubbed/aliased:
__green() {
  printf -- "%b" "$1"
}

__red() {
  printf -- "%b" "$1"
}

_log() {
    return 0
}

_info() {
  printf -- "%s" "[$(date)] " >&1
  echo "$1"
}

_err() {
  printf -- "%s" "[$(date)] " >&2
  if [ -z "$2" ]; then
    __red "$1" >&2
  else
    __red "$1='$2'" >&2
  fi
  printf "\n" >&2
  return 1
}

# key
_readaccountconf() {
  echo "${!1}"
}

# key
_readaccountconf_mutable() {
  _readaccountconf "$1"
}

# no-ops:
_clearaccountconf() {
  return 0
}

_cleardomainconf() {
  return 0
}

_debug() {
  if [[ $DEBUG -eq 0 ]]; then
    return
  fi
  printf -- "%s" "[$(date)] " >&1
  echo "$1 $2"
}

_debug2() {
  _debug $1 $2
}

_debug3() {
  _debug $1 $2
}

_secure_debug() {
  _debug $1 $2
}

_secure_debug2() {
  _debug $1 $2
}

_secure_debug3() {
  _debug $1 $2
}

_saveaccountconf() {
  return 0
}

_saveaccountconf_mutable() {
  return 0
}

_save_conf() {
  return 0
}

_savedomainconf() {
  return 0
}

_source_plugin_config() {
  return 0
}

# Proxmox implementation to inject the DNSAPI variables
_load_plugin_config() {
    while IFS= read -r line; do
	ADDR=(${line/=/ })
	key="${ADDR[0]}"
	value="${ADDR[1]}"

	# acme.sh uses eval insted of export
	if [ -n "$key" ]; then
	    export "$key"="$value"
	fi
    done
}

# call setup and teardown direct
# the parameter must be set in the correct order
# $1 <String> DNS Plugin name
# $2 <String> Fully Qualified Domain Name
# $3 <String> value for TXT record
# $4 <String> DNS plugin auth and config parameter separated by ","
# $5 <Integer> 0 is off, and the default all others are on.

setup() {
  dns_plugin="dns_$1"
  dns_plugin_path="${DNS_PLUGIN_PATH}/${dns_plugin}.sh"
  fqdn="_acme-challenge.$2"
  DEBUG=$3
  IFS= read -r txtvalue
  plugin_conf_string=$4

  _load_plugin_config

  if ! . "$dns_plugin_path"; then
    _err "Load file $dns_plugin error."
    return 1
  fi

  addcommand="${dns_plugin}_add"
  if ! _exists "$addcommand"; then
    _err "It seems that your api file is not correct, it must have a function named: $addcommand"
    return 1
  fi

  if ! $addcommand "$fqdn" "$txtvalue"; then
    _err "Error add txt for domain:$fulldomain"
    return 1
  fi
}

teardown() {
  dns_plugin="dns_$1"
  dns_plugin_path="${DNS_PLUGIN_PATH}/${dns_plugin}.sh"
  fqdn="_acme-challenge.$2"
  DEBUG=$3
  IFS= read -r txtvalue

  _load_plugin_config

  if ! . "$dns_plugin_path"; then
    _err "Load file $dns_plugin error."
    return 1
  fi

  rmcommand="${dns_plugin}_rm"
  if ! _exists "$rmcommand"; then
    _err "It seems that your api file is not correct, it must have a function named: $rmcommand"
    return 1
  fi

  if ! $rmcommand "$fqdn" "$txtvalue"; then
    _err "Error add txt for domain:$fulldomain"
    return 1
  fi
}

"$@"