#!/usr/bin/env sh

# World4You - www.world4you.com
# Lorenz Stechauner, 2020 - https://www.github.com/NerLOR

WORLD4YOU_API="https://my.world4you.com/en"
PAKETNR=''
TLD=''
RECORD=''

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

# Usage: dns_world4you_add <fqdn> <value>
dns_world4you_add() {
  fqdn="$1"
  value="$2"
  _info "Using world4you to add record"
  _debug fulldomain "$fqdn"
  _debug txtvalue "$value"

  _login
  if [ "$?" != 0 ]; then
    return 1
  fi

  export _H1="Cookie: W4YSESSID=$sessid"
  form=$(_get "$WORLD4YOU_API/")
  _get_paketnr "$fqdn" "$form"
  paketnr="$PAKETNR"
  if [ -z "$paketnr" ]; then
    _err "Unable to parse paketnr"
    return 3
  fi
  _debug paketnr "$paketnr"

  export _H1="Cookie: W4YSESSID=$sessid"
  form=$(_get "$WORLD4YOU_API/$paketnr/dns")
  formiddp=$(echo "$form" | grep 'AddDnsRecordForm\[uniqueFormIdDP\]' | sed 's/^.*name="AddDnsRecordForm\[uniqueFormIdDP\]" value="\([^"]*\)".*$/\1/')
  form_token=$(echo "$form" | grep 'AddDnsRecordForm\[_token\]' | sed 's/^.*name="AddDnsRecordForm\[_token\]" value="\([^"]*\)".*$/\1/')
  if [ -z "$formiddp" ]; then
    _err "Unable to parse form"
    return 3
  fi

  _resethttp
  export ACME_HTTP_NO_REDIRECTS=1
  body="AddDnsRecordForm[name]=$RECORD&AddDnsRecordForm[dnsType][type]=TXT&AddDnsRecordForm[value]=$value&AddDnsRecordForm[uniqueFormIdDP]=$formiddp&AddDnsRecordForm[_token]=$form_token"
  _info "Adding record..."
  ret=$(_post "$body" "$WORLD4YOU_API/$paketnr/dns" '' POST 'application/x-www-form-urlencoded')
  _resethttp

  if _contains "$(_head_n 1 <"$HTTP_HEADER")" '302'; then
    res=$(_get "$WORLD4YOU_API/$paketnr/dns")
    if _contains "$res" "successfully"; then
      return 0
    else
      msg=$(echo "$res" | grep -A 15 'data-type="danger"' | grep "<h3[^>]*>[^<]" | sed 's/<[^>]*>\|^\s*//g')
      if [ "$msg" = '' ]; then
        _err "Unable to add record: Unknown error"
        echo "$ret" >'error-01.html'
        echo "$res" >'error-02.html'
        _err "View error-01.html and error-02.html for debugging"
      else
        _err "Unable to add record: my.world4you.com: $msg"
      fi
      return 1
    fi
  else
    _err "$(_head_n 1 <"$HTTP_HEADER")"
    _err "View $HTTP_HEADER for debugging"
    return 1
  fi
}

# Usage: dns_world4you_rm <fqdn> <value>
dns_world4you_rm() {
  fqdn="$1"
  value="$2"
  _info "Using world4you to remove record"
  _debug fulldomain "$fqdn"
  _debug txtvalue "$value"

  _login
  if [ "$?" != 0 ]; then
    return 1
  fi

  export _H1="Cookie: W4YSESSID=$sessid"
  form=$(_get "$WORLD4YOU_API/")
  _get_paketnr "$fqdn" "$form"
  paketnr="$PAKETNR"
  if [ -z "$paketnr" ]; then
    _err "Unable to parse paketnr"
    return 3
  fi
  _debug paketnr "$paketnr"

  form=$(_get "$WORLD4YOU_API/$paketnr/dns")
  formiddp=$(echo "$form" | grep 'DeleteDnsRecordForm\[uniqueFormIdDP\]' | sed 's/^.*name="DeleteDnsRecordForm\[uniqueFormIdDP\]" value="\([^"]*\)".*$/\1/')
  form_token=$(echo "$form" | grep 'DeleteDnsRecordForm\[_token\]' | sed 's/^.*name="DeleteDnsRecordForm\[_token\]" value="\([^"]*\)".*$/\1/')
  if [ -z "$formiddp" ]; then
    _err "Unable to parse form"
    return 3
  fi

  recordid=$(printf "TXT:%s.:\"%s\"" "$fqdn" "$value" | _base64)
  _debug recordid "$recordid"

  _resethttp
  export ACME_HTTP_NO_REDIRECTS=1
  body="DeleteDnsRecordForm[recordId]=$recordid&DeleteDnsRecordForm[uniqueFormIdDP]=$formiddp&DeleteDnsRecordForm[_token]=$form_token"
  _info "Removing record..."
  ret=$(_post "$body" "$WORLD4YOU_API/$paketnr/dns/record/delete" '' POST 'application/x-www-form-urlencoded')
  _resethttp

  if _contains "$(_head_n 1 <"$HTTP_HEADER")" '302'; then
    res=$(_get "$WORLD4YOU_API/$paketnr/dns")
    if _contains "$res" "successfully"; then
      return 0
    else
      msg=$(echo "$res" | grep -A 15 'data-type="danger"' | grep "<h3[^>]*>[^<]" | sed 's/<[^>]*>\|^\s*//g')
      if [ "$msg" = '' ]; then
        _err "Unable to remove record: Unknown error"
        echo "$ret" >'error-01.html'
        echo "$res" >'error-02.html'
        _err "View error-01.html and error-02.html for debugging"
      else
        _err "Unable to remove record: my.world4you.com: $msg"
      fi
      return 1
    fi
  else
    _err "$(_head_n 1 <"$HTTP_HEADER")"
    _err "View $HTTP_HEADER for debugging"
    return 1
  fi
}

################ Private functions ################

# Usage: _login
_login() {
  WORLD4YOU_USERNAME="${WORLD4YOU_USERNAME:-$(_readaccountconf_mutable WORLD4YOU_USERNAME)}"
  WORLD4YOU_PASSWORD="${WORLD4YOU_PASSWORD:-$(_readaccountconf_mutable WORLD4YOU_PASSWORD)}"

  if [ -z "$WORLD4YOU_USERNAME" ] || [ -z "$WORLD4YOU_PASSWORD" ]; then
    WORLD4YOU_USERNAME=""
    WORLD4YOU_PASSWORD=""
    _err "You didn't specify world4you username and password yet."
    _err "Usage: export WORLD4YOU_USERNAME=<name>"
    _err "Usage: export WORLD4YOU_PASSWORD=<password>"
    return 1
  fi

  _saveaccountconf_mutable WORLD4YOU_USERNAME "$WORLD4YOU_USERNAME"
  _saveaccountconf_mutable WORLD4YOU_PASSWORD "$WORLD4YOU_PASSWORD"

  _resethttp
  export ACME_HTTP_NO_REDIRECTS=1
  page=$(_get "$WORLD4YOU_API/login")
  _resethttp

  if _contains "$(_head_n 1 <"$HTTP_HEADER")" '302'; then
    _info "Already logged in"
    _parse_sessid
    return 0
  fi

  _info "Logging in..."

  username="$WORLD4YOU_USERNAME"
  password="$WORLD4YOU_PASSWORD"
  csrf_token=$(echo "$page" | grep '_csrf_token' | sed 's/^.*<input[^>]*value=\"\([^"]*\)\".*$/\1/')
  _parse_sessid

  export _H1="Cookie: W4YSESSID=$sessid"
  export _H2="X-Requested-With: XMLHttpRequest"
  body="_username=$username&_password=$password&_csrf_token=$csrf_token"
  ret=$(_post "$body" "$WORLD4YOU_API/login" '' POST 'application/x-www-form-urlencoded')
  unset _H2

  _debug ret "$ret"
  if _contains "$ret" "\"success\":true"; then
    _info "Successfully logged in"
    _parse_sessid
  else
    _err "Unable to log in: $(echo "$ret" | sed 's/^.*"message":"\([^\"]*\)".*$/\1/')"
    return 1
  fi
}

# Usage: _get_paketnr <fqdn> <form>
_get_paketnr() {
  fqdn="$1"
  form="$2"

  domains=$(echo "$form" | grep 'header-paket-domain' | sed 's/<[^>]*>//g' | sed 's/^.*>\([^>]*\)$/\1/')
  domain=''
  for domain in $domains; do
    if _contains "$fqdn" "$domain\$"; then
      break
    fi
    domain=''
  done
  if [ -z "$domain" ]; then
    return 1
  fi

  TLD="$domain"
  _debug domain "$domain"
  RECORD=$(echo "$fqdn" | cut -c"1-$((${#fqdn} - ${#TLD} - 1))")
  PAKETNR=$(echo "$form" | grep "data-textfilter=\".* $domain " | _tail_n 1 | sed "s|.*$WORLD4YOU_API/\\([0-9]*\\)/.*|\\1|")
  return 0
}

# Usage: _parse_sessid
_parse_sessid() {
  sessid=$(grep 'W4YSESSID' <"$HTTP_HEADER" | _tail_n 1 | sed 's/^.*W4YSESSID=\([^;]*\);.*$/\1/')
}