<?php

// header("Content-Type: content/json"); 
header("Content-Type: text/plain");

function stop($error)
{
  http_response_code(513);
  $RESPONSE = new stdClass();
  $RESPONSE->status = "error";
  $RESPONSE->response = $error;
  printf(json_encode($RESPONSE));
  die;
}

$_SERVER['REQUEST_METHOD'] !== "POST" && stop("Method " . $_SERVER['REQUEST_METHOD'] . " not allowed");

$POST = json_decode(file_get_contents('php://input'));

$DATA = "<< EOF
server 127.0.0.1
update add $POST->name $POST->ttl $POST->class $POST->type $POST->rr
send
EOF";

passthru("/usr/bin/nsupdate $DATA", $result_code);
$result_code === 0 || stop("Unable to update zone");

$RESPONSE = new stdClass();
$RESPONSE->status = "success";
$RESPONSE->response = "zone added successfully";

printf(json_encode($RESPONSE));