283 lines
19 KiB
JavaScript
283 lines
19 KiB
JavaScript
"use strict";
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const base64url = require("base64url");
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const https = require("https");
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let jwa = require('jwa');
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const url = require("url");
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/**
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* json_to_utf8base64url
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* @private
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* @description convert JSON to base64-url encoded string using UTF-8 encoding
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* @param {Object} obj
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* @return {string}
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* @throws Exception if object cannot be stringified or contains cycle
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*/
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let json_to_utf8base64url = function (obj) {
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return base64url.default.encode(new Buffer(JSON.stringify(obj), 'utf8'));
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};
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/**
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* @class JWebClient
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* @constructor
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* @description Implementation of HTTPS-based JSON-Web-Client
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*/
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class JWebClient {
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constructor() {
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/**
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* @member {Object} module:JWebClient~JWebClient#key_pair
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* @desc User account key pair
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*/
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this.key_pair = null; // {Object}
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/**
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* @member {string} module:JWebClient~JWebClient#last_nonce
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* @desc Cached nonce returned with last request
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*/
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this.last_nonce = null; // {string}
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/**
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* @member {boolean} module:JWebClient~JWebClient#verbose
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* @desc Determines verbose mode
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*/
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this.verbose = false; // {boolean}
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}
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/**
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* createJWT
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* @description create JSON-Web-Token signed object
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* @param {string|undefined} nonce
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* @param {Object|string|number|boolean} payload
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* @param {string} alg
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* @param {Object|string} key
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* @param {Object} jwk
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* @return {string}
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*/
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createJWT(nonce, payload, alg, key, jwk) {
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/*jshint -W069 */
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// prepare key
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if (key instanceof Object) {
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key = base64url.default.toBuffer(key['k']);
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}
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// prepare header
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let header = {
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typ: 'JWT',
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alg: alg,
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jwk: jwk,
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nonce: null
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};
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if (nonce !== void 0) {
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header.nonce = nonce;
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}
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// concatenate header and payload
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let input = [
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json_to_utf8base64url(header),
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json_to_utf8base64url(payload)
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].join('.');
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// sign input
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let hmac = jwa(alg);
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let sig = hmac.sign(input, key);
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// concatenate input and signature
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let output = [
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input,
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sig
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].join('.');
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// dereference
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header = null;
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hmac = null;
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input = null;
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jwk = null;
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key = null;
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payload = null;
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// output
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return output;
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}
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/**
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* request
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* @description make GET or POST request over HTTPS and use JOSE as payload type
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* @param {string} query
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* @param {string} payload
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* @param {function} callback
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* @param {function} errorCallback
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*/
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request(query, payload, callback, errorCallback) {
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/*jshint -W069 */
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if (typeof query !== 'string') {
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query = ''; // ensure query is string
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}
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if (typeof callback !== 'function') {
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callback = this.emptyCallback; // ensure callback is function
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}
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if (typeof errorCallback !== 'function') {
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errorCallback = this.emptyCallback; // ensure callback is function
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}
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// prepare options
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let uri = url.parse(query);
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let options = {
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hostname: uri.hostname,
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port: parseInt(uri.port, 10),
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path: uri.path,
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method: null,
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headers: {}
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};
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if (typeof payload === 'string') {
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options.method = 'POST';
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options.headers = {
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'Content-Type': 'application/jose',
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'Content-Length': payload.length
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};
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}
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else {
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options.method = 'GET';
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}
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// prepare request
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let req = https.request(options, function (res) {
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// receive data
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let data = [];
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res.on('data', function (block) {
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if (block instanceof Buffer) {
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data.push(block);
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}
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});
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res.on('end', function () {
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let buf = Buffer.concat(data);
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let isJSON = ((res instanceof Object)
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&& (res['headers'] instanceof Object)
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&& (typeof res.headers['content-type'] === 'string')
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&& (res.headers['content-type'].indexOf('json') > -1));
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if (isJSON && buf.length > 0) {
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try {
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// convert to JSON
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let json = JSON.parse(buf.toString('utf8'));
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callback(json, res);
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}
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catch (e) {
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// error (if empty or invalid JSON)
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errorCallback(void 0, e);
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}
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}
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else {
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callback(buf, res);
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}
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});
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}).on('error', function (e) {
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console.error('Error occured', e);
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// error
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errorCallback(void 0, e);
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});
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// write POST body if payload was specified
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if (typeof payload === 'string') {
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req.write(payload);
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}
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// make request
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req.end();
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}
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/**
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* get
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* @description make GET request
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* @param {string} uri
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* @param {function} callback
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* @param {function} errorCallback
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*/
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get(uri, callback, errorCallback) {
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/*jshint -W069 */
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let ctx = this;
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if (typeof callback !== 'function') {
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callback = this.emptyCallback; // ensure callback is function
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}
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this.request(uri, void 0, function (ans, res) {
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ctx.evaluateStatus(uri, null, ans, res);
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// save replay nonce for later requests
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if ((res instanceof Object) && (res['headers'] instanceof Object)) {
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ctx.last_nonce = res.headers['replay-nonce'];
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}
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callback(ans, res);
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// dereference
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ans = null;
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callback = null;
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ctx = null;
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res = null;
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}, errorCallback);
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// dereference
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errorCallback = null;
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}
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/**
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* post
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* @description make POST request
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* @param {string} uri
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* @param {Object|string|number|boolean} payload
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* @param {function} callback
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* @param {function} errorCallback
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*/
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post(uri, payload, callback, errorCallback) {
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/*jshint -W069 */
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let ctx = this;
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if (typeof callback !== 'function') {
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callback = this.emptyCallback; // ensure callback is function
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}
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let key_pair = this.key_pair;
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if (!(key_pair instanceof Object)) {
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key_pair = {}; // ensure key pair is object
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}
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let jwt = this.createJWT(this.last_nonce, payload, 'RS256', key_pair['private_pem'], key_pair['public_jwk']);
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this.request(uri, jwt, (ans, res) => {
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ctx.evaluateStatus(uri, payload, ans, res);
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// save replay nonce for later requests
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if ((res instanceof Object) && (res['headers'] instanceof Object)) {
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ctx.last_nonce = res.headers['replay-nonce'];
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}
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callback(ans, res);
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// dereference
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ans = null;
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callback = null;
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ctx = null;
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key_pair = null;
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payload = null;
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res = null;
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}, errorCallback);
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// dereference
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errorCallback = null;
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}
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/**
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* evaluateStatus
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* @description check if status is expected and log errors
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* @param {string} uri
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* @param {Object|string|number|boolean} payload
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* @param {Object|string} ans
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* @param {Object} res
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*/
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evaluateStatus(uri, payload, ans, res) {
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/*jshint -W069 */
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if (this.verbose) {
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if ((payload instanceof Object)
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|| (typeof payload === 'string')
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|| (typeof payload === 'number')
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|| (typeof payload === 'boolean')) {
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console.error('Send :', payload); // what has been sent
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}
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}
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let uri_parsed = url.parse(uri);
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if (res['statusCode'] >= 100 && res['statusCode'] < 400) {
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console.error('HTTP :', res['statusCode'], uri_parsed.path); // response code if successful
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}
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if (res['statusCode'] >= 400 && res['statusCode'] < 500) {
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console.error('HTTP :', res['statusCode'], uri_parsed.path); // response code if error
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if (ans instanceof Object) {
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if (typeof ans['detail'] === 'string') {
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console.error('Message:', ans.detail.split(' :: ').pop()); // error message if any
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}
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}
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}
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if (this.verbose) {
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console.error('Receive:', res['headers']); // received headers
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console.error('Receive:', ans); // received data
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}
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// dereference
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ans = null;
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payload = null;
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res = null;
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uri_parsed = null;
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}
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/**
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* Helper: Empty callback
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*/
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emptyCallback() {
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// nop
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}
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}
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exports.JWebClient = JWebClient;
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