#!/usr/bin/env sh

# Cloudxns.com Domain api
#
#CX_Key="1234"
#
#CX_Secret="sADDsdasdgdsf"


CX_Api="https://www.cloudxns.net/api2"


#REST_API
########  Public functions #####################

#Usage: add  _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
dns_cx_add() {
  fulldomain=$1
  txtvalue=$2
  
  if [ -z "$CX_Key" ] || [ -z "$CX_Secret" ] ; then
    _err "You don't specify cloudxns.com  api key or secret yet."
    _err "Please create you key and try again."
    return 1
  fi
  
  REST_API=$CX_Api
  
  #save the api key and email to the account conf file.
  _saveaccountconf CX_Key "$CX_Key"
  _saveaccountconf CX_Secret "$CX_Secret"
  
 
  _debug "First detect the root zone"
  if ! _get_root $fulldomain ; then
    _err "invalid domain"
    return 1
  fi
  
  existing_records  $_domain  $_sub_domain
  _debug count "$count"
  if [ "$?" != "0" ] ; then
    _err "Error get existing records."
    return 1
  fi

  if [ "$count" == "0" ] ; then
    add_record $_domain $_sub_domain $txtvalue
  else
    update_record $_domain $_sub_domain $txtvalue
  fi
  
  if [ "$?" == "0" ] ; then
    return 0
  fi
  return 1
}

#usage:  root  sub
#return if the sub record already exists.
#echos the existing records count.
# '0' means doesn't exist
existing_records() {
  _debug "Getting txt records"
  root=$1
  sub=$2
  
  if ! _rest GET "record/$_domain_id?:domain_id?host_id=0&offset=0&row_num=100" ; then
    return 1
  fi
  count=0
  seg=$(printf "$response" | grep -o "{[^{]*host\":\"$_sub_domain[^}]*}")
  _debug seg "$seg"
  if [ -z "$seg" ] ; then
    return 0
  fi

  if printf "$response" | grep '"type":"TXT"' > /dev/null ; then
    count=1
    record_id=$(printf "$seg" | grep -o \"record_id\":\"[^\"]*\" | cut -d : -f 2 | tr -d \")
    _debug record_id "$record_id"
    return 0    
  fi
  
}

#add the txt record.
#usage: root  sub  txtvalue
add_record() {
  root=$1
  sub=$2
  txtvalue=$3
  fulldomain=$sub.$root
  
  _info "Adding record"
  
  if ! _rest POST "record" "{\"domain_id\": $_domain_id, \"host\":\"$_sub_domain\", \"value\":\"$txtvalue\", \"type\":\"TXT\",\"ttl\":600, \"line_id\":1}"; then
    return 1
  fi
  
  return 0
}

#update the txt record
#Usage: root sub txtvalue
update_record() {
  root=$1
  sub=$2
  txtvalue=$3
  fulldomain=$sub.$root
  
  _info "Updating record"
  
  if _rest PUT "record/$record_id" "{\"domain_id\": $_domain_id, \"host\":\"$_sub_domain\", \"value\":\"$txtvalue\", \"type\":\"TXT\",\"ttl\":600, \"line_id\":1}" ; then
    return 0
  fi
  
  return 1
}




####################  Private functions bellow ##################################
#_acme-challenge.www.domain.com
#returns
# _sub_domain=_acme-challenge.www
# _domain=domain.com
# _domain_id=sdjkglgdfewsdfg
_get_root() {
  domain=$1
  i=2
  p=1
  
  if ! _rest GET "domain" ; then
    return 1
  fi
  
  while [ '1' ] ; do
    h=$(printf $domain | cut -d . -f $i-100)
    _debug h "$h"
    if [ -z "$h" ] ; then
      #not valid
      return 1;
    fi

    if printf "$response" | grep "$h." ; then
      seg=$(printf "$response" | grep -o "{[^{]*$h\.[^}]*\}" )
      _debug seg "$seg"
      _domain_id=$(printf "$seg" | grep -o \"id\":\"[^\"]*\" | cut -d : -f 2 | tr -d \")
      _debug _domain_id "$_domain_id"
      if [ "$_domain_id" ] ; then
        _sub_domain=$(printf $domain | cut -d . -f 1-$p)
        _debug _sub_domain $_sub_domain
        _domain=$h
        _debug _domain $_domain
        return 0
      fi
      return 1
    fi
    p=$i
    let "i+=1"
  done
  return 1
}


#Usage: method  URI  data
_rest() {
  m=$1
  ep="$2"
  _debug $ep
  url="$REST_API/$ep"
  _debug url "$url"
  
  cdate=$(date -u  "+%Y-%m-%d %H:%M:%S UTC")
  _debug cdate "$cdate"
  
  data="$3"
  _debug data "$data"
    
  sec="$CX_Key$url$data$cdate$CX_Secret"
  _debug sec "$sec"
  hmac=$(printf "$sec"| openssl md5 |cut -d " " -f 2)
  _debug hmac "$hmac"
    
  if [ "$3" ] ; then
    response="$(curl --silent -X $m "$url" -H "API-KEY: $CX_Key" -H "API-REQUEST-DATE: $cdate" -H "API-HMAC: $hmac" -H 'Content-Type: application/json'  -d "$data")"
  else
    response="$(curl --silent -X $m "$url" -H "API-KEY: $CX_Key" -H "API-REQUEST-DATE: $cdate" -H "API-HMAC: $hmac" -H 'Content-Type: application/json')"
  fi
  
  if [ "$?" != "0" ] ; then
    _err "error $ep"
    return 1
  fi
  _debug2 response "$response"
  if ! printf "$response" | grep '"message":"success"' > /dev/null ; then
    return 1
  fi
  return 0
}