FM / fresh

/var/www/verywell.gr/server/delivery/node_modules/fresh/

/var/www/verywell.gr/server/delivery/node_modules/fresh

Name	Size	Mode	Actions
HISTORY.md	1500	0644	edit dl rm
index.js	2711	0644	edit dl rm
LICENSE	1174	0644	edit dl rm
package.json	2460	0644	edit dl rm
README.md	3374	0644	edit dl rm

Edit: /var/www/verywell.gr/server/delivery/node_modules/fresh/index.js (2711B)

/*!
 * fresh
 * Copyright(c) 2012 TJ Holowaychuk
 * Copyright(c) 2016-2017 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

/**
 * RegExp to check for no-cache token in Cache-Control.
 * @private
 */

var CACHE_CONTROL_NO_CACHE_REGEXP = /(?:^|,)\s*?no-cache\s*?(?:,|$)/

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

module.exports = fresh

/**
 * Check freshness of the response using request and response headers.
 *
 * @param {Object} reqHeaders
 * @param {Object} resHeaders
 * @return {Boolean}
 * @public
 */

function fresh (reqHeaders, resHeaders) {
  // fields
  var modifiedSince = reqHeaders['if-modified-since']
  var noneMatch = reqHeaders['if-none-match']

// unconditional request
  if (!modifiedSince && !noneMatch) {
    return false
  }

// Always return stale when Cache-Control: no-cache
  // to support end-to-end reload requests
  // https://tools.ietf.org/html/rfc2616#section-14.9.4
  var cacheControl = reqHeaders['cache-control']
  if (cacheControl && CACHE_CONTROL_NO_CACHE_REGEXP.test(cacheControl)) {
    return false
  }

// if-none-match
  if (noneMatch && noneMatch !== '*') {
    var etag = resHeaders['etag']

if (!etag) {
      return false
    }

var etagStale = true
    var matches = parseTokenList(noneMatch)
    for (var i = 0; i < matches.length; i++) {
      var match = matches[i]
      if (match === etag || match === 'W/' + etag || 'W/' + match === etag) {
        etagStale = false
        break
      }
    }

if (etagStale) {
      return false
    }
  }

// if-modified-since
  if (modifiedSince) {
    var lastModified = resHeaders['last-modified']
    var modifiedStale = !lastModified || !(parseHttpDate(lastModified) <= parseHttpDate(modifiedSince))

if (modifiedStale) {
      return false
    }
  }

return true
}

/**
 * Parse an HTTP Date into a number.
 *
 * @param {string} date
 * @private
 */

function parseHttpDate (date) {
  var timestamp = date && Date.parse(date)

// istanbul ignore next: guard against date.js Date.parse patching
  return typeof timestamp === 'number'
    ? timestamp
    : NaN
}

/**
 * Parse a HTTP token list.
 *
 * @param {string} str
 * @private
 */

function parseTokenList (str) {
  var end = 0
  var list = []
  var start = 0

// gather tokens
  for (var i = 0, len = str.length; i < len; i++) {
    switch (str.charCodeAt(i)) {
      case 0x20: /*   */
        if (start === end) {
          start = end = i + 1
        }
        break
      case 0x2c: /* , */
        list.push(str.substring(start, end))
        start = end = i + 1
        break
      default:
        end = i + 1
        break
    }
  }

// final token
  list.push(str.substring(start, end))

return list
}

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