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Directory : /var/app/comcon24/cms/node_modules/vary/

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Current File : /var/app/comcon24/cms/node_modules/vary/index.js

/*!
 * vary
 * Copyright(c) 2014-2017 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

/**
 * Module exports.
 */

module.exports = vary
module.exports.append = append

/**
 * RegExp to match field-name in RFC 7230 sec 3.2
 *
 * field-name    = token
 * token         = 1*tchar
 * tchar         = "!" / "#" / "$" / "%" / "&" / "'" / "*"
 *               / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
 *               / DIGIT / ALPHA
 *               ; any VCHAR, except delimiters
 */

var FIELD_NAME_REGEXP = /^[!#$%&'*+\-.^_`|~0-9A-Za-z]+$/

/**
 * Append a field to a vary header.
 *
 * @param {String} header
 * @param {String|Array} field
 * @return {String}
 * @public
 */

function append (header, field) {
  if (typeof header !== 'string') {
    throw new TypeError('header argument is required')
  }

  if (!field) {
    throw new TypeError('field argument is required')
  }

  // get fields array
  var fields = !Array.isArray(field)
    ? parse(String(field))
    : field

  // assert on invalid field names
  for (var j = 0; j < fields.length; j++) {
    if (!FIELD_NAME_REGEXP.test(fields[j])) {
      throw new TypeError('field argument contains an invalid header name')
    }
  }

  // existing, unspecified vary
  if (header === '*') {
    return header
  }

  // enumerate current values
  var val = header
  var vals = parse(header.toLowerCase())

  // unspecified vary
  if (fields.indexOf('*') !== -1 || vals.indexOf('*') !== -1) {
    return '*'
  }

  for (var i = 0; i < fields.length; i++) {
    var fld = fields[i].toLowerCase()

    // append value (case-preserving)
    if (vals.indexOf(fld) === -1) {
      vals.push(fld)
      val = val
        ? val + ', ' + fields[i]
        : fields[i]
    }
  }

  return val
}

/**
 * Parse a vary header into an array.
 *
 * @param {String} header
 * @return {Array}
 * @private
 */

function parse (header) {
  var end = 0
  var list = []
  var start = 0

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

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

  return list
}

/**
 * Mark that a request is varied on a header field.
 *
 * @param {Object} res
 * @param {String|Array} field
 * @public
 */

function vary (res, field) {
  if (!res || !res.getHeader || !res.setHeader) {
    // quack quack
    throw new TypeError('res argument is required')
  }

  // get existing header
  var val = res.getHeader('Vary') || ''
  var header = Array.isArray(val)
    ? val.join(', ')
    : String(val)

  // set new header
  if ((val = append(header, field))) {
    res.setHeader('Vary', val)
  }
}

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