mirror of
https://github.com/musix-org/musix-oss
synced 2024-12-23 06:43:17 +00:00
333 lines
10 KiB
JavaScript
333 lines
10 KiB
JavaScript
var aws4 = exports,
|
||
url = require('url'),
|
||
querystring = require('querystring'),
|
||
crypto = require('crypto'),
|
||
lru = require('./lru'),
|
||
credentialsCache = lru(1000)
|
||
|
||
// http://docs.amazonwebservices.com/general/latest/gr/signature-version-4.html
|
||
|
||
function hmac(key, string, encoding) {
|
||
return crypto.createHmac('sha256', key).update(string, 'utf8').digest(encoding)
|
||
}
|
||
|
||
function hash(string, encoding) {
|
||
return crypto.createHash('sha256').update(string, 'utf8').digest(encoding)
|
||
}
|
||
|
||
// This function assumes the string has already been percent encoded
|
||
function encodeRfc3986(urlEncodedString) {
|
||
return urlEncodedString.replace(/[!'()*]/g, function(c) {
|
||
return '%' + c.charCodeAt(0).toString(16).toUpperCase()
|
||
})
|
||
}
|
||
|
||
// request: { path | body, [host], [method], [headers], [service], [region] }
|
||
// credentials: { accessKeyId, secretAccessKey, [sessionToken] }
|
||
function RequestSigner(request, credentials) {
|
||
|
||
if (typeof request === 'string') request = url.parse(request)
|
||
|
||
var headers = request.headers = (request.headers || {}),
|
||
hostParts = this.matchHost(request.hostname || request.host || headers.Host || headers.host)
|
||
|
||
this.request = request
|
||
this.credentials = credentials || this.defaultCredentials()
|
||
|
||
this.service = request.service || hostParts[0] || ''
|
||
this.region = request.region || hostParts[1] || 'us-east-1'
|
||
|
||
// SES uses a different domain from the service name
|
||
if (this.service === 'email') this.service = 'ses'
|
||
|
||
if (!request.method && request.body)
|
||
request.method = 'POST'
|
||
|
||
if (!headers.Host && !headers.host) {
|
||
headers.Host = request.hostname || request.host || this.createHost()
|
||
|
||
// If a port is specified explicitly, use it as is
|
||
if (request.port)
|
||
headers.Host += ':' + request.port
|
||
}
|
||
if (!request.hostname && !request.host)
|
||
request.hostname = headers.Host || headers.host
|
||
|
||
this.isCodeCommitGit = this.service === 'codecommit' && request.method === 'GIT'
|
||
}
|
||
|
||
RequestSigner.prototype.matchHost = function(host) {
|
||
var match = (host || '').match(/([^\.]+)\.(?:([^\.]*)\.)?amazonaws\.com(\.cn)?$/)
|
||
var hostParts = (match || []).slice(1, 3)
|
||
|
||
// ES's hostParts are sometimes the other way round, if the value that is expected
|
||
// to be region equals ‘es’ switch them back
|
||
// e.g. search-cluster-name-aaaa00aaaa0aaa0aaaaaaa0aaa.us-east-1.es.amazonaws.com
|
||
if (hostParts[1] === 'es')
|
||
hostParts = hostParts.reverse()
|
||
|
||
return hostParts
|
||
}
|
||
|
||
// http://docs.aws.amazon.com/general/latest/gr/rande.html
|
||
RequestSigner.prototype.isSingleRegion = function() {
|
||
// Special case for S3 and SimpleDB in us-east-1
|
||
if (['s3', 'sdb'].indexOf(this.service) >= 0 && this.region === 'us-east-1') return true
|
||
|
||
return ['cloudfront', 'ls', 'route53', 'iam', 'importexport', 'sts']
|
||
.indexOf(this.service) >= 0
|
||
}
|
||
|
||
RequestSigner.prototype.createHost = function() {
|
||
var region = this.isSingleRegion() ? '' :
|
||
(this.service === 's3' && this.region !== 'us-east-1' ? '-' : '.') + this.region,
|
||
service = this.service === 'ses' ? 'email' : this.service
|
||
return service + region + '.amazonaws.com'
|
||
}
|
||
|
||
RequestSigner.prototype.prepareRequest = function() {
|
||
this.parsePath()
|
||
|
||
var request = this.request, headers = request.headers, query
|
||
|
||
if (request.signQuery) {
|
||
|
||
this.parsedPath.query = query = this.parsedPath.query || {}
|
||
|
||
if (this.credentials.sessionToken)
|
||
query['X-Amz-Security-Token'] = this.credentials.sessionToken
|
||
|
||
if (this.service === 's3' && !query['X-Amz-Expires'])
|
||
query['X-Amz-Expires'] = 86400
|
||
|
||
if (query['X-Amz-Date'])
|
||
this.datetime = query['X-Amz-Date']
|
||
else
|
||
query['X-Amz-Date'] = this.getDateTime()
|
||
|
||
query['X-Amz-Algorithm'] = 'AWS4-HMAC-SHA256'
|
||
query['X-Amz-Credential'] = this.credentials.accessKeyId + '/' + this.credentialString()
|
||
query['X-Amz-SignedHeaders'] = this.signedHeaders()
|
||
|
||
} else {
|
||
|
||
if (!request.doNotModifyHeaders && !this.isCodeCommitGit) {
|
||
if (request.body && !headers['Content-Type'] && !headers['content-type'])
|
||
headers['Content-Type'] = 'application/x-www-form-urlencoded; charset=utf-8'
|
||
|
||
if (request.body && !headers['Content-Length'] && !headers['content-length'])
|
||
headers['Content-Length'] = Buffer.byteLength(request.body)
|
||
|
||
if (this.credentials.sessionToken && !headers['X-Amz-Security-Token'] && !headers['x-amz-security-token'])
|
||
headers['X-Amz-Security-Token'] = this.credentials.sessionToken
|
||
|
||
if (this.service === 's3' && !headers['X-Amz-Content-Sha256'] && !headers['x-amz-content-sha256'])
|
||
headers['X-Amz-Content-Sha256'] = hash(this.request.body || '', 'hex')
|
||
|
||
if (headers['X-Amz-Date'] || headers['x-amz-date'])
|
||
this.datetime = headers['X-Amz-Date'] || headers['x-amz-date']
|
||
else
|
||
headers['X-Amz-Date'] = this.getDateTime()
|
||
}
|
||
|
||
delete headers.Authorization
|
||
delete headers.authorization
|
||
}
|
||
}
|
||
|
||
RequestSigner.prototype.sign = function() {
|
||
if (!this.parsedPath) this.prepareRequest()
|
||
|
||
if (this.request.signQuery) {
|
||
this.parsedPath.query['X-Amz-Signature'] = this.signature()
|
||
} else {
|
||
this.request.headers.Authorization = this.authHeader()
|
||
}
|
||
|
||
this.request.path = this.formatPath()
|
||
|
||
return this.request
|
||
}
|
||
|
||
RequestSigner.prototype.getDateTime = function() {
|
||
if (!this.datetime) {
|
||
var headers = this.request.headers,
|
||
date = new Date(headers.Date || headers.date || new Date)
|
||
|
||
this.datetime = date.toISOString().replace(/[:\-]|\.\d{3}/g, '')
|
||
|
||
// Remove the trailing 'Z' on the timestamp string for CodeCommit git access
|
||
if (this.isCodeCommitGit) this.datetime = this.datetime.slice(0, -1)
|
||
}
|
||
return this.datetime
|
||
}
|
||
|
||
RequestSigner.prototype.getDate = function() {
|
||
return this.getDateTime().substr(0, 8)
|
||
}
|
||
|
||
RequestSigner.prototype.authHeader = function() {
|
||
return [
|
||
'AWS4-HMAC-SHA256 Credential=' + this.credentials.accessKeyId + '/' + this.credentialString(),
|
||
'SignedHeaders=' + this.signedHeaders(),
|
||
'Signature=' + this.signature(),
|
||
].join(', ')
|
||
}
|
||
|
||
RequestSigner.prototype.signature = function() {
|
||
var date = this.getDate(),
|
||
cacheKey = [this.credentials.secretAccessKey, date, this.region, this.service].join(),
|
||
kDate, kRegion, kService, kCredentials = credentialsCache.get(cacheKey)
|
||
if (!kCredentials) {
|
||
kDate = hmac('AWS4' + this.credentials.secretAccessKey, date)
|
||
kRegion = hmac(kDate, this.region)
|
||
kService = hmac(kRegion, this.service)
|
||
kCredentials = hmac(kService, 'aws4_request')
|
||
credentialsCache.set(cacheKey, kCredentials)
|
||
}
|
||
return hmac(kCredentials, this.stringToSign(), 'hex')
|
||
}
|
||
|
||
RequestSigner.prototype.stringToSign = function() {
|
||
return [
|
||
'AWS4-HMAC-SHA256',
|
||
this.getDateTime(),
|
||
this.credentialString(),
|
||
hash(this.canonicalString(), 'hex'),
|
||
].join('\n')
|
||
}
|
||
|
||
RequestSigner.prototype.canonicalString = function() {
|
||
if (!this.parsedPath) this.prepareRequest()
|
||
|
||
var pathStr = this.parsedPath.path,
|
||
query = this.parsedPath.query,
|
||
headers = this.request.headers,
|
||
queryStr = '',
|
||
normalizePath = this.service !== 's3',
|
||
decodePath = this.service === 's3' || this.request.doNotEncodePath,
|
||
decodeSlashesInPath = this.service === 's3',
|
||
firstValOnly = this.service === 's3',
|
||
bodyHash
|
||
|
||
if (this.service === 's3' && this.request.signQuery) {
|
||
bodyHash = 'UNSIGNED-PAYLOAD'
|
||
} else if (this.isCodeCommitGit) {
|
||
bodyHash = ''
|
||
} else {
|
||
bodyHash = headers['X-Amz-Content-Sha256'] || headers['x-amz-content-sha256'] ||
|
||
hash(this.request.body || '', 'hex')
|
||
}
|
||
|
||
if (query) {
|
||
queryStr = encodeRfc3986(querystring.stringify(Object.keys(query).sort().reduce(function(obj, key) {
|
||
if (!key) return obj
|
||
obj[key] = !Array.isArray(query[key]) ? query[key] :
|
||
(firstValOnly ? query[key][0] : query[key].slice().sort())
|
||
return obj
|
||
}, {})))
|
||
}
|
||
if (pathStr !== '/') {
|
||
if (normalizePath) pathStr = pathStr.replace(/\/{2,}/g, '/')
|
||
pathStr = pathStr.split('/').reduce(function(path, piece) {
|
||
if (normalizePath && piece === '..') {
|
||
path.pop()
|
||
} else if (!normalizePath || piece !== '.') {
|
||
if (decodePath) piece = decodeURIComponent(piece)
|
||
path.push(encodeRfc3986(encodeURIComponent(piece)))
|
||
}
|
||
return path
|
||
}, []).join('/')
|
||
if (pathStr[0] !== '/') pathStr = '/' + pathStr
|
||
if (decodeSlashesInPath) pathStr = pathStr.replace(/%2F/g, '/')
|
||
}
|
||
|
||
return [
|
||
this.request.method || 'GET',
|
||
pathStr,
|
||
queryStr,
|
||
this.canonicalHeaders() + '\n',
|
||
this.signedHeaders(),
|
||
bodyHash,
|
||
].join('\n')
|
||
}
|
||
|
||
RequestSigner.prototype.canonicalHeaders = function() {
|
||
var headers = this.request.headers
|
||
function trimAll(header) {
|
||
return header.toString().trim().replace(/\s+/g, ' ')
|
||
}
|
||
return Object.keys(headers)
|
||
.sort(function(a, b) { return a.toLowerCase() < b.toLowerCase() ? -1 : 1 })
|
||
.map(function(key) { return key.toLowerCase() + ':' + trimAll(headers[key]) })
|
||
.join('\n')
|
||
}
|
||
|
||
RequestSigner.prototype.signedHeaders = function() {
|
||
return Object.keys(this.request.headers)
|
||
.map(function(key) { return key.toLowerCase() })
|
||
.sort()
|
||
.join(';')
|
||
}
|
||
|
||
RequestSigner.prototype.credentialString = function() {
|
||
return [
|
||
this.getDate(),
|
||
this.region,
|
||
this.service,
|
||
'aws4_request',
|
||
].join('/')
|
||
}
|
||
|
||
RequestSigner.prototype.defaultCredentials = function() {
|
||
var env = process.env
|
||
return {
|
||
accessKeyId: env.AWS_ACCESS_KEY_ID || env.AWS_ACCESS_KEY,
|
||
secretAccessKey: env.AWS_SECRET_ACCESS_KEY || env.AWS_SECRET_KEY,
|
||
sessionToken: env.AWS_SESSION_TOKEN,
|
||
}
|
||
}
|
||
|
||
RequestSigner.prototype.parsePath = function() {
|
||
var path = this.request.path || '/',
|
||
queryIx = path.indexOf('?'),
|
||
query = null
|
||
|
||
if (queryIx >= 0) {
|
||
query = querystring.parse(path.slice(queryIx + 1))
|
||
path = path.slice(0, queryIx)
|
||
}
|
||
|
||
// S3 doesn't always encode characters > 127 correctly and
|
||
// all services don't encode characters > 255 correctly
|
||
// So if there are non-reserved chars (and it's not already all % encoded), just encode them all
|
||
if (/[^0-9A-Za-z!'()*\-._~%/]/.test(path)) {
|
||
path = path.split('/').map(function(piece) {
|
||
return encodeURIComponent(decodeURIComponent(piece))
|
||
}).join('/')
|
||
}
|
||
|
||
this.parsedPath = {
|
||
path: path,
|
||
query: query,
|
||
}
|
||
}
|
||
|
||
RequestSigner.prototype.formatPath = function() {
|
||
var path = this.parsedPath.path,
|
||
query = this.parsedPath.query
|
||
|
||
if (!query) return path
|
||
|
||
// Services don't support empty query string keys
|
||
if (query[''] != null) delete query['']
|
||
|
||
return path + '?' + encodeRfc3986(querystring.stringify(query))
|
||
}
|
||
|
||
aws4.RequestSigner = RequestSigner
|
||
|
||
aws4.sign = function(request, credentials) {
|
||
return new RequestSigner(request, credentials).sign()
|
||
}
|