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/*!
* 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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