Solr API Proxy - Run a request on a remote solr instance

solr-api-proxy.php

<?php

/**
 * Solr Query Proxy.
 *   - For use with Solarium Query Objects only.
 */

error_reporting(0);

require __DIR__ . '/../vendor/autoload.php';

// Config
$solr = [
  'endpoint' => [
    'localhost' => [
      'host' => 'solr.internal',
      'port' => '8080',
      'path' => '/solr/index',
    ],
  ],
];

// Check the validity of the api key.
$headers = getallheaders();
if(!isset($headers['Key'])) {
  header('Content-Type: application/json');
  http_response_code(401);
  print json_encode(['message' => 'Must provide API key as header.']); exit;
}
if($headers['Key'] !== 'APIKEY') { // replace with a better API key
  header('Content-Type: application/json');
  http_response_code(401);
  print json_encode(['message' => 'API key is invalid.']); exit;
}

// Grab the body of the request and serialize the body.
$entityBody = file_get_contents('php://input');
$query = unserialize($entityBody);

// Check we have a valid Solarium Query Object, if not throw an error.
if(!is_a($query, 'Solarium\QueryType\Select\Query\Query')) {
  header('Content-Type: application/json');
  http_response_code(422);
  print json_encode([
    'message' => 'Must be an instance of "Solarium\QueryType\Select\Query\Query"'
  ]);
  exit;
}

// Create the query response
$client = new \Solarium\Client($solr);
$request = $client->createRequest($query);
$response = $client->executeRequest($request);

$result_set_transport = serialize($response);
print $result_set_transport;