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'use strict'
var url = require('url')
var qs = require('qs')
var caseless = require('caseless')
var uuid = require('uuid/v4')
var oauth = require('oauth-sign')
var crypto = require('crypto')
var Buffer = require('safe-buffer').Buffer
function OAuth (request) {
this.request = request
this.params = null
}
OAuth.prototype.buildParams = function (_oauth, uri, method, query, form, qsLib) {
var oa = {}
for (var i in _oauth) {
oa['oauth_' + i] = _oauth[i]
}
if (!oa.oauth_version) {
oa.oauth_version = '1.0'
}
if (!oa.oauth_timestamp) {
oa.oauth_timestamp = Math.floor(Date.now() / 1000).toString()
}
if (!oa.oauth_nonce) {
oa.oauth_nonce = uuid().replace(/-/g, '')
}
if (!oa.oauth_signature_method) {
oa.oauth_signature_method = 'HMAC-SHA1'
}
var consumer_secret_or_private_key = oa.oauth_consumer_secret || oa.oauth_private_key // eslint-disable-line camelcase
delete oa.oauth_consumer_secret
delete oa.oauth_private_key
var token_secret = oa.oauth_token_secret // eslint-disable-line camelcase
delete oa.oauth_token_secret
var realm = oa.oauth_realm
delete oa.oauth_realm
delete oa.oauth_transport_method
var baseurl = uri.protocol + '//' + uri.host + uri.pathname
var params = qsLib.parse([].concat(query, form, qsLib.stringify(oa)).join('&'))
oa.oauth_signature = oauth.sign(
oa.oauth_signature_method,
method,
baseurl,
params,
consumer_secret_or_private_key, // eslint-disable-line camelcase
token_secret // eslint-disable-line camelcase
)
if (realm) {
oa.realm = realm
}
return oa
}
OAuth.prototype.buildBodyHash = function (_oauth, body) {
if (['HMAC-SHA1', 'RSA-SHA1'].indexOf(_oauth.signature_method || 'HMAC-SHA1') < 0) {
this.request.emit('error', new Error('oauth: ' + _oauth.signature_method +
' signature_method not supported with body_hash signing.'))
}
var shasum = crypto.createHash('sha1')
shasum.update(body || '')
var sha1 = shasum.digest('hex')
return Buffer.from(sha1, 'hex').toString('base64')
}
OAuth.prototype.concatParams = function (oa, sep, wrap) {
wrap = wrap || ''
var params = Object.keys(oa).filter(function (i) {
return i !== 'realm' && i !== 'oauth_signature'
}).sort()
if (oa.realm) {
params.splice(0, 0, 'realm')
}
params.push('oauth_signature')
return params.map(function (i) {
return i + '=' + wrap + oauth.rfc3986(oa[i]) + wrap
}).join(sep)
}
OAuth.prototype.onRequest = function (_oauth) {
var self = this
self.params = _oauth
var uri = self.request.uri || {}
var method = self.request.method || ''
var headers = caseless(self.request.headers)
var body = self.request.body || ''
var qsLib = self.request.qsLib || qs
var form
var query
var contentType = headers.get('content-type') || ''
var formContentType = 'application/x-www-form-urlencoded'
var transport = _oauth.transport_method || 'header'
if (contentType.slice(0, formContentType.length) === formContentType) {
contentType = formContentType
form = body
}
if (uri.query) {
query = uri.query
}
if (transport === 'body' && (method !== 'POST' || contentType !== formContentType)) {
self.request.emit('error', new Error('oauth: transport_method of body requires POST ' +
'and content-type ' + formContentType))
}
if (!form && typeof _oauth.body_hash === 'boolean') {
_oauth.body_hash = self.buildBodyHash(_oauth, self.request.body.toString())
}
var oa = self.buildParams(_oauth, uri, method, query, form, qsLib)
switch (transport) {
case 'header':
self.request.setHeader('Authorization', 'OAuth ' + self.concatParams(oa, ',', '"'))
break
case 'query':
var href = self.request.uri.href += (query ? '&' : '?') + self.concatParams(oa, '&')
self.request.uri = url.parse(href)
self.request.path = self.request.uri.path
break
case 'body':
self.request.body = (form ? form + '&' : '') + self.concatParams(oa, '&')
break
default:
self.request.emit('error', new Error('oauth: transport_method invalid'))
}
}
exports.OAuth = OAuth