"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.acceptCompression = acceptCompression;
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */

function containsGzip(s) {
  return s.split(',').map(d => d.trim()).includes('gzip');
}

/**
 * Returns whether request headers accept a response using gzip compression.
 *
 * @param headers - Request headers.
 * @returns boolean
 */
function acceptCompression(headers) {
  let compressed = false;
  Object.keys(headers).forEach(key => {
    if (key.toLocaleLowerCase() === 'accept-encoding') {
      const acceptEncoding = headers[key];
      if (typeof acceptEncoding === 'string') {
        compressed = containsGzip(acceptEncoding);
      } else if (Array.isArray(acceptEncoding)) {
        for (const ae of acceptEncoding) {
          if (containsGzip(ae)) {
            compressed = true;
            break;
          }
        }
      }
    }
  });
  return compressed;
}