--- /dev/null
+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
+}
+
+RequestSigner.prototype.matchHost = function(host) {
+ var match = (host || '').match(/([^\.]+)\.(?:([^\.]*)\.)?amazonaws\.com$/)
+ 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) {
+ 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'] = this.credentials.sessionToken
+
+ if (this.service === 's3')
+ headers['X-Amz-Content-Sha256'] = hash(this.request.body || '', 'hex')
+
+ if (headers['X-Amz-Date'])
+ this.datetime = 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, '')
+ }
+ 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,
+ queryStr = '',
+ normalizePath = this.service !== 's3',
+ decodePath = this.service === 's3' || this.request.doNotEncodePath,
+ decodeSlashesInPath = this.service === 's3',
+ firstValOnly = this.service === 's3',
+ bodyHash = this.service === 's3' && this.request.signQuery ?
+ 'UNSIGNED-PAYLOAD' : 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 = querystring.unescape(piece)
+ path.push(encodeRfc3986(querystring.escape(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 querystring.escape(querystring.unescape(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()
+}
Code Review / simantics / district.git / blobdiff