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