FM / on-headers

/var/www/verywell.gr/server/delivery/node_modules/on-headers/

/var/www/verywell.gr/server/delivery/node_modules/on-headers

Name	Size	Mode	Actions
HISTORY.md	387	0644	edit dl rm
index.js	2664	0644	edit dl rm
LICENSE	1089	0644	edit dl rm
package.json	2297	0644	edit dl rm
README.md	2155	0644	edit dl rm

Edit: /var/www/verywell.gr/server/delivery/node_modules/on-headers/index.js (2664B)

/*!
 * on-headers
 * Copyright(c) 2014 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

/**
 * Module exports.
 * @public
 */

module.exports = onHeaders

/**
 * Create a replacement writeHead method.
 *
 * @param {function} prevWriteHead
 * @param {function} listener
 * @private
 */

function createWriteHead (prevWriteHead, listener) {
  var fired = false

// return function with core name and argument list
  return function writeHead (statusCode) {
    // set headers from arguments
    var args = setWriteHeadHeaders.apply(this, arguments)

// fire listener
    if (!fired) {
      fired = true
      listener.call(this)

// pass-along an updated status code
      if (typeof args[0] === 'number' && this.statusCode !== args[0]) {
        args[0] = this.statusCode
        args.length = 1
      }
    }

return prevWriteHead.apply(this, args)
  }
}

/**
 * Execute a listener when a response is about to write headers.
 *
 * @param {object} res
 * @return {function} listener
 * @public
 */

function onHeaders (res, listener) {
  if (!res) {
    throw new TypeError('argument res is required')
  }

if (typeof listener !== 'function') {
    throw new TypeError('argument listener must be a function')
  }

res.writeHead = createWriteHead(res.writeHead, listener)
}

/**
 * Set headers contained in array on the response object.
 *
 * @param {object} res
 * @param {array} headers
 * @private
 */

function setHeadersFromArray (res, headers) {
  for (var i = 0; i < headers.length; i++) {
    res.setHeader(headers[i][0], headers[i][1])
  }
}

/**
 * Set headers contained in object on the response object.
 *
 * @param {object} res
 * @param {object} headers
 * @private
 */

function setHeadersFromObject (res, headers) {
  var keys = Object.keys(headers)
  for (var i = 0; i < keys.length; i++) {
    var k = keys[i]
    if (k) res.setHeader(k, headers[k])
  }
}

/**
 * Set headers and other properties on the response object.
 *
 * @param {number} statusCode
 * @private
 */

function setWriteHeadHeaders (statusCode) {
  var length = arguments.length
  var headerIndex = length > 1 && typeof arguments[1] === 'string'
    ? 2
    : 1

var headers = length >= headerIndex + 1
    ? arguments[headerIndex]
    : undefined

this.statusCode = statusCode

if (Array.isArray(headers)) {
    // handle array case
    setHeadersFromArray(this, headers)
  } else if (headers) {
    // handle object case
    setHeadersFromObject(this, headers)
  }

// copy leading arguments
  var args = new Array(Math.min(length, headerIndex))
  for (var i = 0; i < args.length; i++) {
    args[i] = arguments[i]
  }

return args
}

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