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'use strict';

const { parseContentType } = require('./utils.js');

function getInstance(cfg) {
  const headers = cfg.headers;
  const conType = parseContentType(headers['content-type']);
  if (!conType)
    throw new Error('Malformed content type');

  for (const type of TYPES) {
    const matched = type.detect(conType);
    if (!matched)
      continue;

    const instanceCfg = {
      limits: cfg.limits,
      headers,
      conType,
      highWaterMark: undefined,
      fileHwm: undefined,
      defCharset: undefined,
      defParamCharset: undefined,
      preservePath: false,
    };
    if (cfg.highWaterMark)
      instanceCfg.highWaterMark = cfg.highWaterMark;
    if (cfg.fileHwm)
      instanceCfg.fileHwm = cfg.fileHwm;
    instanceCfg.defCharset = cfg.defCharset;
    instanceCfg.defParamCharset = cfg.defParamCharset;
    instanceCfg.preservePath = cfg.preservePath;
    return new type(instanceCfg);
  }

  throw new Error(`Unsupported content type: ${headers['content-type']}`);
}

// Note: types are explicitly listed here for easier bundling
// See: https://github.com/mscdex/busboy/issues/121
const TYPES = [
  require('./types/multipart'),
  require('./types/urlencoded'),
].filter(function(typemod) { return typeof typemod.detect === 'function'; });

module.exports = (cfg) => {
  if (typeof cfg !== 'object' || cfg === null)
    cfg = {};

  if (typeof cfg.headers !== 'object'
      || cfg.headers === null
      || typeof cfg.headers['content-type'] !== 'string') {
    throw new Error('Missing Content-Type');
  }

  return getInstance(cfg);
};
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