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<!DOCTYPE html><html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Source: router/Utils.js</title><!--[if lt IE 9]>

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href="RouterResponse.html">RouterResponse</a></div><div class="sidebar-section-children"><a href="RouterStack.html">RouterStack</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-global"><div>Global</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="global.html#getRoutes">getRoutes</a></div><div class="sidebar-section-children"><a href="global.html#loadRoutes">loadRoutes</a></div></div></div></div></div><div class="navbar-container" id="VuAckcnZhf"><nav class="navbar"><div class="navbar-left-items"></div><div class="navbar-right-items"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div><nav></nav></nav></div><div class="toc-container"><div class="toc-content"><span class="bold">On this page</span><div id="eed4d2a0bfd64539bb9df78095dec881"></div></div></div><div class="body-wrapper"><div class="main-content"><div class="main-wrapper"><section id="source-page" class="source-page"><header><h1 id="title" class="has-anchor">router_Utils.js</h1></header><article><pre class="prettyprint source lang-js"><code>/** @module router/Utils */

/**

* lambda-lambda-lambda/router

* AWS Lambda@Edge serverless application router.

* 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 && (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' && 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 && (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' && value.length >= 1 && value.length <= 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) && !/^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><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><div class="mobile-nav-links"></div><div class="mobile-sidebar-items-c"><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-modules"><div>Modules</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="module-router_Route.html">router/Route</a></div><div class="sidebar-section-children"><a href="module-router_Utils.html">router/Utils</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="Router.html">Router</a></div><div class="sidebar-section-children"><a href="RouterRequest.html">RouterRequest</a></div><div class="sidebar-section-children"><a href="RouterResponse.html">RouterResponse</a></div><div class="sidebar-section-children"><a href="RouterStack.html">RouterStack</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-global"><div>Global</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="global.html#getRoutes">getRoutes</a></div><div class="sidebar-section-children"><a href="global.html#loadRoutes">loadRoutes</a></div></div></div><div class="mobile-navbar-actions"><div class="navbar-right-item"><button class="icon-button search-button" aria-label="open-search"><svg><use xlink:href="#search-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button theme-toggle" aria-label="toggle-theme"><svg><use class="theme-svg-use" xlink:href="#light-theme-icon"></use></svg></button></div><div class="navbar-right-item"><button class="icon-button font-size" aria-label="change-font-size"><svg><use xlink:href="#font-size-icon"></use></svg></button></div></div></div></div><script type="text/javascript" src="scripts/core.min.js"></script><script src="scripts/search.min.js" defer="defer"></script><script src="scripts/third-party/fuse.js" defer="defer"></script><script type="text/javascript">var tocbotInstance=tocbot.init({tocSelector:"#eed4d2a0bfd64539bb9df78095dec881",contentSelector:".main-content",headingSelector:"h1, h2, h3",hasInnerContainers:!0,scrollContainer:".main-content",headingsOffset:130,onClick:bringLinkToView})</script></body></html>

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