FM / etag

/var/www/myprog.com.ua/server/node/node_modules/etag/

/var/www/myprog.com.ua/server/node/node_modules/etag

Name	Size	Mode	Actions
HISTORY.md	1732	0644	edit dl rm
index.js	2479	0644	edit dl rm
LICENSE	1094	0644	edit dl rm
package.json	1306	0644	edit dl rm
README.md	4198	0644	edit dl rm

Edit: /var/www/myprog.com.ua/server/node/node_modules/etag/index.js (2479B)

/*!
 * etag
 * Copyright(c) 2014-2016 Douglas Christopher Wilson
 * MIT Licensed
 */

'use strict'

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

module.exports = etag

/**
 * Module dependencies.
 * @private
 */

var crypto = require('crypto')
var Stats = require('fs').Stats

/**
 * Module variables.
 * @private
 */

var toString = Object.prototype.toString

/**
 * Generate an entity tag.
 *
 * @param {Buffer|string} entity
 * @return {string}
 * @private
 */

function entitytag (entity) {
  if (entity.length === 0) {
    // fast-path empty
    return '"0-2jmj7l5rSw0yVb/vlWAYkK/YBwk"'
  }

// compute hash of entity
  var hash = crypto
    .createHash('sha1')
    .update(entity, 'utf8')
    .digest('base64')
    .substring(0, 27)

// compute length of entity
  var len = typeof entity === 'string'
    ? Buffer.byteLength(entity, 'utf8')
    : entity.length

return '"' + len.toString(16) + '-' + hash + '"'
}

/**
 * Create a simple ETag.
 *
 * @param {string|Buffer|Stats} entity
 * @param {object} [options]
 * @param {boolean} [options.weak]
 * @return {String}
 * @public
 */

function etag (entity, options) {
  if (entity == null) {
    throw new TypeError('argument entity is required')
  }

// support fs.Stats object
  var isStats = isstats(entity)
  var weak = options && typeof options.weak === 'boolean'
    ? options.weak
    : isStats

// validate argument
  if (!isStats && typeof entity !== 'string' && !Buffer.isBuffer(entity)) {
    throw new TypeError('argument entity must be string, Buffer, or fs.Stats')
  }

// generate entity tag
  var tag = isStats
    ? stattag(entity)
    : entitytag(entity)

return weak
    ? 'W/' + tag
    : tag
}

/**
 * Determine if object is a Stats object.
 *
 * @param {object} obj
 * @return {boolean}
 * @api private
 */

function isstats (obj) {
  // genuine fs.Stats
  if (typeof Stats === 'function' && obj instanceof Stats) {
    return true
  }

// quack quack
  return obj && typeof obj === 'object' &&
    'ctime' in obj && toString.call(obj.ctime) === '[object Date]' &&
    'mtime' in obj && toString.call(obj.mtime) === '[object Date]' &&
    'ino' in obj && typeof obj.ino === 'number' &&
    'size' in obj && typeof obj.size === 'number'
}

/**
 * Generate a tag for a stat.
 *
 * @param {object} stat
 * @return {string}
 * @private
 */

function stattag (stat) {
  var mtime = stat.mtime.getTime().toString(16)
  var size = stat.size.toString(16)

return '"' + size + '-' + mtime + '"'
}

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