doc/router_Utils.js.html at master · lambda-lambda-lambda/doc · GitHub

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class="has-anchor">router_Utils.js</h1></header><article><preclass="prettyprint source lang-js"><code>/** @module router/Utils */

/**
 * lambda-lambda-lambda/router
 * AWS Lambda@Edge serverless application router.
 *
 * Copyright 2021-2025, Marc S. Brooks (https://mbrooks.info)
 * Licensed under the MIT license:
 * http://www.opensource.org/licenses/mit-license.php
 */

'use strict';

// Local reference.
const Utils = this;

/**
 * Check if value is an async function.
 *
 * @param {AsyncFunction} func
 * Async function.
 *
 * @return {Boolean}
 *
 * @example
 * const result = isAsyncFunc(async function() {}));
 * // true
 */
exports.isAsyncFunc = function(value) {
 return (value &amp;&amp; (value[Symbol.toStringTag] === 'AsyncFunction'));
};

/**
 * Check if value is an Object instance.
 *
 * @param {Object}
 * Object to check.
 *
 * @return {Boolean}
 *
 * @example
 * const result = Utils.isObject({foo: 'bar'});
 * // true
 */
exports.isObject = function(value) {
 return typeof value === 'object' &amp;&amp; Object.prototype.toString.call(value) === '[object Object]';
};

/**
 * Check if object is (or returns) Promise.
 *
 * @param {Object} obj
 * Promise object.
 *
 * @return {Boolean}
 *
 * @example
 * const result = isPromise(new Promise(() => {}));
 * // true
 *
 * const result = function() {
 * return Promise.resolve();
 * };
 * // true
 */
exports.isPromise = function(obj) {
 return (obj &amp;&amp; (obj[Symbol.toStringTag] === 'Promise' || typeof obj.then === 'function'));
};

/**
 * Check if valid URI path.
 *
 * @param {String} value
 * URI path value.
 *
 * @return {Boolean}
 *
 * @example
 * const result = isValidPath('/api/test');
 * // true
 */
exports.isValidPath = function(value) {
 return /^\/([a-z0-9-_\/]+)?$/.test(value);
};

/**
 * Check if valid Route/Middleware function.
 *
 * @param {Function} value
 * Route function.
 *
 * @return {Boolean}
 *
 * @example
 * const result = isValidFunc((req, res, next) => {});
 * // true
 */
exports.isValidFunc = function(value) {
 return (typeof value === 'function' &amp;&amp; value.length >= 1 &amp;&amp; value.length &lt;= 3);
};

/**
 * Check if valid Request/Route.
 *
 * @param {String} uri
 * Request URI.
 *
 * @param {String} path
 * Route path value.
 *
 * @param {Function} func
 * Route function.
 *
 * @return {Boolean}
 *
 * @example
 * const result = isValidRoute('/api/test/123456', '/api/test', (req, res) => {}));
 * // true
 */
exports.isValidRoute = function(uri, path, func) {
 if (Utils.isValidFunc(func) &amp;&amp; !/^route:/.test(func.name)) {
 return !!uri.match(new RegExp(`^${path}(\/[a-z0-9-_]+)?$`, 'i')); // nosemgrep
 }

 return (uri === path);
};

/**
 * Return URI fragment, if Route is a resource.
 *
 * @param {String} uri
 * Request URI.
 *
 * @param {String} path
 * Route path value.
 *
 * @return {String|undefined}
 *
 * @example
 * const result = getResourceId('/api/test/abc123', '/api/test');
 * // abc123
 */
exports.getResourceId = function(uri, path) {
 const fragment = uri.replace(new RegExp(`^(?:${path}(?:\/([a-z0-9-_]+))?)$`, 'i'), '$1'); // nosemgrep
 if (fragment !== uri) {
 return fragment;
 }
};

/**
 * Set name for a given function (inline).
 *
 * @param {Function} func
 * Route function.
 *
 * @param {Function} value
 * Function name.
 *
 * @example
 * const func = function() {};
 * setFuncName(func, 'test');
 * func.name
 * // test
 */
exports.setFuncName = function(func, value) {
 Object.defineProperty(func, 'name', {value});
};

/**
 * Get executed module parent directory.
 *
 * @return {String}
 *
 * @example
 * const dir = moduleParent();
 * // path/to/app/parent/directory
 */
exports.moduleParent = function() {
 const moduleParents = Object.values(require.cache)
 .filter((m) => m.children.includes(module));

 return moduleParents[0]?.parent.path;
};

/**
 * Execute events; propagate variable state.
 *
 * @param {Array} promises
 * Array of promised events.
 *
 * @return {Promise}
 *
 * @example
 * const state = {};
 *
 * const promises = [
 * () => Promise.resolve(a),
 * (b) => Promise.resolve(b),
 * (c) => Promise.resolve(c),
 *
 * ..
 * ];
 *
 * promiseEvents(promises)
 * .then(obj => obj)
 * .catch(function(err) {
 *
 * });
 */
exports.promiseEvents = function(promises) {
 return promises.reduce(function(current, next) {
 return current.then(next);
 }, Promise.resolve([]));
};
</code></pre></article></section></div></div></div><divclass="search-container" id="PkfLWpAbet" style="display:none"><divclass="wrapper" id="iCxFxjkHbP"><buttonclass="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><usexlink:href="#close-icon"></use></svg></button><divclass="search-box-c"><svg><usexlink:href="#search-icon"></use></svg><inputtype="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><divclass="search-result-c" id="fWwVHRuDuN"><spanclass="search-result-c-text">Type anything to view search result</span></div></div></div><divclass="mobile-menu-icon-container"><buttonclass="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><usexlink:href="#menu-icon"></use></svg></button></div><divid="mobile-sidebar" class="mobile-sidebar-container"><divclass="mobile-sidebar-wrapper"><divclass="mobile-nav-links"></div><divclass="mobile-sidebar-items-c"><divclass="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><usexlink:href="#down-icon"></use></svg></div><divclass="sidebar-section-children-container"><divclass="sidebar-section-children"><ahref="module-router_Route.html">router/Route</a></div><divclass="sidebar-section-children"><ahref="module-router_Utils.html">router/Utils</a></div></div><divclass="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><usexlink:href="#down-icon"></use></svg></div><divclass="sidebar-section-children-container"><divclass="sidebar-section-children"><ahref="Router.html">Router</a></div><divclass="sidebar-section-children"><ahref="RouterRequest.html">RouterRequest</a></div><divclass="sidebar-section-children"><ahref="RouterResponse.html">RouterResponse</a></div><divclass="sidebar-section-children"><ahref="RouterStack.html">RouterStack</a></div></div><divclass="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-global"><div>Global</div><svg><usexlink:href="#down-icon"></use></svg></div><divclass="sidebar-section-children-container"><divclass="sidebar-section-children"><ahref="global.html#getRoutes">getRoutes</a></div><divclass="sidebar-section-children"><ahref="global.html#loadRoutes">loadRoutes</a></div></div></div><divclass="mobile-navbar-actions"><divclass="navbar-right-item"><buttonclass="icon-button search-button" aria-label="open-search"><svg><usexlink:href="#search-icon"></use></svg></button></div><divclass="navbar-right-item"><buttonclass="icon-button theme-toggle" aria-label="toggle-theme"><svg><useclass="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><divclass="navbar-right-item"><buttonclass="icon-button font-size" aria-label="change-font-size"><svg><usexlink:href="#font-size-icon"></use></svg></button></div></div></div></div><scripttype="text/javascript" src="scripts/core.min.js"></script><scriptsrc="scripts/search.min.js" defer="defer"></script><scriptsrc="scripts/third-party/fuse.js" defer="defer"></script><scripttype="text/javascript">vartocbotInstance=tocbot.init({tocSelector:"#eed4d2a0bfd64539bb9df78095dec881",contentSelector:".main-content",headingSelector:"h1, h2, h3",hasInnerContainers:!0,scrollContainer:".main-content",headingsOffset:130,onClick:bringLinkToView})</script></body></html>