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Edit File : index.js \| Size : 4.31 KB
/! Copyright 2010 LearnBoost <dev@learnboost.com> * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. / /* * Module dependencies. / var crypto = require('crypto') , parse = require('url').parse ; /* * Valid keys. / var keys = [ 'acl' , 'location' , 'logging' , 'notification' , 'partNumber' , 'policy' , 'requestPayment' , 'torrent' , 'uploadId' , 'uploads' , 'versionId' , 'versioning' , 'versions' , 'website' ] /* * Return an "Authorization" header value with the given `options` * in the form of "AWS <key>:<signature>" * * @param {Object} options * @return {String} * @api private / function authorization (options) { return 'AWS ' + options.key + ':' + sign(options) } module.exports = authorization module.exports.authorization = authorization /* * Simple HMAC-SHA1 Wrapper * * @param {Object} options * @return {String} * @api private / function hmacSha1 (options) { return crypto.createHmac('sha1', options.secret).update(options.message).digest('base64') } module.exports.hmacSha1 = hmacSha1 /* * Create a base64 sha1 HMAC for `options`. * * @param {Object} options * @return {String} * @api private / function sign (options) { options.message = stringToSign(options) return hmacSha1(options) } module.exports.sign = sign /* * Create a base64 sha1 HMAC for `options`. * * Specifically to be used with S3 presigned URLs * * @param {Object} options * @return {String} * @api private / function signQuery (options) { options.message = queryStringToSign(options) return hmacSha1(options) } module.exports.signQuery= signQuery /* * Return a string for sign() with the given `options`. * * Spec: * * <verb>\n * <md5>\n * <content-type>\n * <date>\n * [headers\n] * <resource> * * @param {Object} options * @return {String} * @api private / function stringToSign (options) { var headers = options.amazonHeaders \|\| '' if (headers) headers += '\n' var r = [ options.verb , options.md5 , options.contentType , options.date ? options.date.toUTCString() : '' , headers + options.resource ] return r.join('\n') } module.exports.stringToSign = stringToSign /* * Return a string for sign() with the given `options`, but is meant exclusively * for S3 presigned URLs * * Spec: * * <date>\n * <resource> * * @param {Object} options * @return {String} * @api private / function queryStringToSign (options){ return 'GET\n\n\n' + options.date + '\n' + options.resource } module.exports.queryStringToSign = queryStringToSign /* * Perform the following: * * - ignore non-amazon headers * - lowercase fields * - sort lexicographically * - trim whitespace between ":" * - join with newline * * @param {Object} headers * @return {String} * @api private / function canonicalizeHeaders (headers) { var buf = [] , fields = Object.keys(headers) ; for (var i = 0, len = fields.length; i < len; ++i) { var field = fields[i] , val = headers[field] , field = field.toLowerCase() ; if (0 !== field.indexOf('x-amz')) continue buf.push(field + ':' + val) } return buf.sort().join('\n') } module.exports.canonicalizeHeaders = canonicalizeHeaders /* * Perform the following: * * - ignore non sub-resources * - sort lexicographically * * @param {String} resource * @return {String} * @api private */ function canonicalizeResource (resource) { var url = parse(resource, true) , path = url.pathname , buf = [] ; Object.keys(url.query).forEach(function(key){ if (!~keys.indexOf(key)) return var val = '' == url.query[key] ? '' : '=' + encodeURIComponent(url.query[key]) buf.push(key + val) }) return path + (buf.length ? '?' + buf.sort().join('&') : '') } module.exports.canonicalizeResource = canonicalizeResource Back

Edit File : index.js | Size : 4.31 KB

/*!
 *  Copyright 2010 LearnBoost <dev@learnboost.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Module dependencies.
 */

var crypto = require('crypto')
  , parse = require('url').parse
  ;

/**
 * Valid keys.
 */

var keys = 
  [ 'acl'
  , 'location'
  , 'logging'
  , 'notification'
  , 'partNumber'
  , 'policy'
  , 'requestPayment'
  , 'torrent'
  , 'uploadId'
  , 'uploads'
  , 'versionId'
  , 'versioning'
  , 'versions'
  , 'website'
  ]

/**
 * Return an "Authorization" header value with the given `options`
 * in the form of "AWS <key>:<signature>"
 *
 * @param {Object} options
 * @return {String}
 * @api private
 */

function authorization (options) {
  return 'AWS ' + options.key + ':' + sign(options)
}

module.exports = authorization
module.exports.authorization = authorization

/**
 * Simple HMAC-SHA1 Wrapper
 *
 * @param {Object} options
 * @return {String}
 * @api private
 */

function hmacSha1 (options) {
  return crypto.createHmac('sha1', options.secret).update(options.message).digest('base64')
}

module.exports.hmacSha1 = hmacSha1

/**
 * Create a base64 sha1 HMAC for `options`. 
 * 
 * @param {Object} options
 * @return {String}
 * @api private
 */

function sign (options) {
  options.message = stringToSign(options)
  return hmacSha1(options)
}
module.exports.sign = sign

/**
 * Create a base64 sha1 HMAC for `options`. 
 *
 * Specifically to be used with S3 presigned URLs
 * 
 * @param {Object} options
 * @return {String}
 * @api private
 */

function signQuery (options) {
  options.message = queryStringToSign(options)
  return hmacSha1(options)
}
module.exports.signQuery= signQuery

/**
 * Return a string for sign() with the given `options`.
 *
 * Spec:
 * 
 *    <verb>\n
 *    <md5>\n
 *    <content-type>\n
 *    <date>\n
 *    [headers\n]
 *    <resource>
 *
 * @param {Object} options
 * @return {String}
 * @api private
 */

function stringToSign (options) {
  var headers = options.amazonHeaders || ''
  if (headers) headers += '\n'
  var r = 
    [ options.verb
    , options.md5
    , options.contentType
    , options.date ? options.date.toUTCString() : ''
    , headers + options.resource
    ]
  return r.join('\n')
}
module.exports.stringToSign = stringToSign

/**
 * Return a string for sign() with the given `options`, but is meant exclusively
 * for S3 presigned URLs
 *
 * Spec:
 * 
 *    <date>\n
 *    <resource>
 *
 * @param {Object} options
 * @return {String}
 * @api private
 */

function queryStringToSign (options){
  return 'GET\n\n\n' + options.date + '\n' + options.resource
}
module.exports.queryStringToSign = queryStringToSign

/**
 * Perform the following:
 *
 *  - ignore non-amazon headers
 *  - lowercase fields
 *  - sort lexicographically
 *  - trim whitespace between ":"
 *  - join with newline
 *
 * @param {Object} headers
 * @return {String}
 * @api private
 */

function canonicalizeHeaders (headers) {
  var buf = []
    , fields = Object.keys(headers)
    ;
  for (var i = 0, len = fields.length; i < len; ++i) {
    var field = fields[i]
      , val = headers[field]
      , field = field.toLowerCase()
      ;
    if (0 !== field.indexOf('x-amz')) continue
    buf.push(field + ':' + val)
  }
  return buf.sort().join('\n')
}
module.exports.canonicalizeHeaders = canonicalizeHeaders

/**
 * Perform the following:
 *
 *  - ignore non sub-resources
 *  - sort lexicographically
 *
 * @param {String} resource
 * @return {String}
 * @api private
 */

function canonicalizeResource (resource) {
  var url = parse(resource, true)
    , path = url.pathname
    , buf = []
    ;

Object.keys(url.query).forEach(function(key){
    if (!~keys.indexOf(key)) return
    var val = '' == url.query[key] ? '' : '=' + encodeURIComponent(url.query[key])
    buf.push(key + val)
  })

return path + (buf.length ? '?' + buf.sort().join('&') : '')
}
module.exports.canonicalizeResource = canonicalizeResource

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