Brunobkr/llama.cpp_AlgMor24_github

1/*!2 * fresh3 * Copyright(c) 2012 TJ Holowaychuk4 * Copyright(c) 2016-2017 Douglas Christopher Wilson5 * MIT Licensed6 */7 8'use strict'9 10/**11 * RegExp to check for no-cache token in Cache-Control.12 * @private13 */14 15var CACHE_CONTROL_NO_CACHE_REGEXP = /(?:^|,)\s*?no-cache\s*?(?:,|$)/16 17/**18 * Module exports.19 * @public20 */21 22module.exports = fresh23 24/**25 * Check freshness of the response using request and response headers.26 *27 * @param {Object} reqHeaders28 * @param {Object} resHeaders29 * @return {Boolean}30 * @public31 */32 33function fresh (reqHeaders, resHeaders) {34  // fields35  var modifiedSince = reqHeaders['if-modified-since']36  var noneMatch = reqHeaders['if-none-match']37 38  // unconditional request39  if (!modifiedSince && !noneMatch) {40    return false41  }42 43  // Always return stale when Cache-Control: no-cache44  // to support end-to-end reload requests45  // https://tools.ietf.org/html/rfc2616#section-14.9.446  var cacheControl = reqHeaders['cache-control']47  if (cacheControl && CACHE_CONTROL_NO_CACHE_REGEXP.test(cacheControl)) {48    return false49  }50 51  // if-none-match takes precedent over if-modified-since52  if (noneMatch) {53    if (noneMatch === '*') {54      return true55    }56    var etag = resHeaders.etag57 58    if (!etag) {59      return false60    }61 62    var matches = parseTokenList(noneMatch)63    for (var i = 0; i < matches.length; i++) {64      var match = matches[i]65      if (match === etag || match === 'W/' + etag || 'W/' + match === etag) {66        return true67      }68    }69 70    return false71  }72 73  // if-modified-since74  if (modifiedSince) {75    var lastModified = resHeaders['last-modified']76    var modifiedStale = !lastModified || !(parseHttpDate(lastModified) <= parseHttpDate(modifiedSince))77 78    if (modifiedStale) {79      return false80    }81  }82 83  return true84}85 86/**87 * Parse an HTTP Date into a number.88 *89 * @param {string} date90 * @private91 */92 93function parseHttpDate (date) {94  var timestamp = date && Date.parse(date)95 96  // istanbul ignore next: guard against date.js Date.parse patching97  return typeof timestamp === 'number'98    ? timestamp99    : NaN100}101 102/**103 * Parse a HTTP token list.104 *105 * @param {string} str106 * @private107 */108 109function parseTokenList (str) {110  var end = 0111  var list = []112  var start = 0113 114  // gather tokens115  for (var i = 0, len = str.length; i < len; i++) {116    switch (str.charCodeAt(i)) {117      case 0x20: /*   */118        if (start === end) {119          start = end = i + 1120        }121        break122      case 0x2c: /* , */123        list.push(str.substring(start, end))124        start = end = i + 1125        break126      default:127        end = i + 1128        break129    }130  }131 132  // final token133  list.push(str.substring(start, end))134 135  return list136}137