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Viewing file:     compatibleAPI.js (3.62 KB)      -rw-r--r--

"use strict";

/** @typedef {import("../index.js").IncomingMessage} IncomingMessage */

/** @typedef {import("../index.js").ServerResponse} ServerResponse */

/**
 * @typedef {Object} ExpectedRequest
 * @property {(name: string) => string | undefined} get
 */

/**
 * @typedef {Object} ExpectedResponse
 * @property {(name: string) => string | string[] | undefined} get
 * @property {(name: string, value: number | string | string[]) => void} set
 * @property {(status: number) => void} status
 * @property {(data: any) => void} send
 */

/**
 * @template {ServerResponse} Response
 * @param {Response} res
 * @returns {string[]}
 */
function getHeaderNames(res) {
  if (typeof res.getHeaderNames !== "function") {
    // @ts-ignore
    // eslint-disable-next-line no-underscore-dangle
    return Object.keys(res._headers || {});
  }

  return res.getHeaderNames();
}
/**
 * @template {IncomingMessage} Request
 * @param {Request} req
 * @param {string} name
 * @returns {string | undefined}
 */


function getHeaderFromRequest(req, name) {
  // Express API
  if (typeof
  /** @type {Request & ExpectedRequest} */
  req.get === "function") {
    return (
      /** @type {Request & ExpectedRequest} */
      req.get(name)
    );
  } // Node.js API
  // @ts-ignore


  return req.headers[name];
}
/**
 * @template {ServerResponse} Response
 * @param {Response} res
 * @param {string} name
 * @returns {number | string | string[] | undefined}
 */


function getHeaderFromResponse(res, name) {
  // Express API
  if (typeof
  /** @type {Response & ExpectedResponse} */
  res.get === "function") {
    return (
      /** @type {Response & ExpectedResponse} */
      res.get(name)
    );
  } // Node.js API


  return res.getHeader(name);
}
/**
 * @template {ServerResponse} Response
 * @param {Response} res
 * @param {string} name
 * @param {number | string | string[]} value
 * @returns {void}
 */


function setHeaderForResponse(res, name, value) {
  // Express API
  if (typeof
  /** @type {Response & ExpectedResponse} */
  res.set === "function") {
    /** @type {Response & ExpectedResponse} */
    res.set(name, typeof value === "number" ? String(value) : value);
    return;
  } // Node.js API


  res.setHeader(name, value);
}
/**
 * @template {ServerResponse} Response
 * @param {Response} res
 * @param {number} code
 */


function setStatusCode(res, code) {
  if (typeof
  /** @type {Response & ExpectedResponse} */
  res.status === "function") {
    /** @type {Response & ExpectedResponse} */
    res.status(code);
    return;
  } // eslint-disable-next-line no-param-reassign


  res.statusCode = code;
}
/**
 * @template {IncomingMessage} Request
 * @template {ServerResponse} Response
 * @param {Request} req
 * @param {Response} res
 * @param {string | Buffer | import("fs").ReadStream} bufferOtStream
 * @param {number} byteLength
 */


function send(req, res, bufferOtStream, byteLength) {
  if (typeof
  /** @type {import("fs").ReadStream} */
  bufferOtStream.pipe === "function") {
    setHeaderForResponse(res, "Content-Length", byteLength);

    if (req.method === "HEAD") {
      res.end();
      return;
    }
    /** @type {import("fs").ReadStream} */


    bufferOtStream.pipe(res);
    return;
  }

  if (typeof
  /** @type {Response & ExpectedResponse} */
  res.send === "function") {
    /** @type {Response & ExpectedResponse} */
    res.send(bufferOtStream);
    return;
  } // Only Node.js API used


  res.setHeader("Content-Length", byteLength);

  if (req.method === "HEAD") {
    res.end();
  } else {
    res.end(bufferOtStream);
  }
}

module.exports = {
  getHeaderNames,
  getHeaderFromRequest,
  getHeaderFromResponse,
  setHeaderForResponse,
  setStatusCode,
  send
};