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129 lines
3.5 KiB
129 lines
3.5 KiB
7 years ago
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'use strict';
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// Load modules
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const Crypto = require('crypto');
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const Url = require('url');
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const Utils = require('./utils');
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// Declare internals
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const internals = {};
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// MAC normalization format version
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exports.headerVersion = '1'; // Prevent comparison of mac values generated with different normalized string formats
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// Supported HMAC algorithms
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exports.algorithms = ['sha1', 'sha256'];
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// Calculate the request MAC
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/*
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type: 'header', // 'header', 'bewit', 'response'
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credentials: {
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key: 'aoijedoaijsdlaksjdl',
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algorithm: 'sha256' // 'sha1', 'sha256'
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},
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options: {
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method: 'GET',
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resource: '/resource?a=1&b=2',
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host: 'example.com',
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port: 8080,
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ts: 1357718381034,
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nonce: 'd3d345f',
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hash: 'U4MKKSmiVxk37JCCrAVIjV/OhB3y+NdwoCr6RShbVkE=',
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ext: 'app-specific-data',
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app: 'hf48hd83qwkj', // Application id (Oz)
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dlg: 'd8djwekds9cj' // Delegated by application id (Oz), requires options.app
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}
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*/
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exports.calculateMac = function (type, credentials, options) {
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const normalized = exports.generateNormalizedString(type, options);
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const hmac = Crypto.createHmac(credentials.algorithm, credentials.key).update(normalized);
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const digest = hmac.digest('base64');
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return digest;
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};
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exports.generateNormalizedString = function (type, options) {
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let resource = options.resource || '';
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if (resource &&
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resource[0] !== '/') {
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const url = Url.parse(resource, false);
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resource = url.path; // Includes query
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}
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let normalized = 'hawk.' + exports.headerVersion + '.' + type + '\n' +
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options.ts + '\n' +
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options.nonce + '\n' +
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(options.method || '').toUpperCase() + '\n' +
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resource + '\n' +
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options.host.toLowerCase() + '\n' +
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options.port + '\n' +
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(options.hash || '') + '\n';
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if (options.ext) {
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normalized = normalized + options.ext.replace('\\', '\\\\').replace('\n', '\\n');
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}
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normalized = normalized + '\n';
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if (options.app) {
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normalized = normalized + options.app + '\n' +
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(options.dlg || '') + '\n';
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}
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return normalized;
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};
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exports.calculatePayloadHash = function (payload, algorithm, contentType) {
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const hash = exports.initializePayloadHash(algorithm, contentType);
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hash.update(payload || '');
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return exports.finalizePayloadHash(hash);
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};
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exports.initializePayloadHash = function (algorithm, contentType) {
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const hash = Crypto.createHash(algorithm);
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hash.update('hawk.' + exports.headerVersion + '.payload\n');
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hash.update(Utils.parseContentType(contentType) + '\n');
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return hash;
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};
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exports.finalizePayloadHash = function (hash) {
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hash.update('\n');
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return hash.digest('base64');
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};
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exports.calculateTsMac = function (ts, credentials) {
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const hmac = Crypto.createHmac(credentials.algorithm, credentials.key);
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hmac.update('hawk.' + exports.headerVersion + '.ts\n' + ts + '\n');
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return hmac.digest('base64');
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};
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exports.timestampMessage = function (credentials, localtimeOffsetMsec) {
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const now = Utils.nowSecs(localtimeOffsetMsec);
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const tsm = exports.calculateTsMac(now, credentials);
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return { ts: now, tsm };
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};
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