Files F102495922

middleware.js
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Created: Fri, Feb 21, 07:50

middleware.js
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	import { argsert } from './argsert.js';
	import { isPromise } from './utils/is-promise.js';
	export function globalMiddlewareFactory(globalMiddleware, context) {
	return function (callback, applyBeforeValidation = false) {
	argsert('<array\|function> [boolean]', [callback, applyBeforeValidation], arguments.length);
	if (Array.isArray(callback)) {
	for (let i = 0; i < callback.length; i++) {
	if (typeof callback[i] !== 'function') {
	throw Error('middleware must be a function');
	}
	callback[i].applyBeforeValidation = applyBeforeValidation;
	}
	Array.prototype.push.apply(globalMiddleware, callback);
	}
	else if (typeof callback === 'function') {
	callback.applyBeforeValidation = applyBeforeValidation;
	globalMiddleware.push(callback);
	}
	return context;
	};
	}
	export function commandMiddlewareFactory(commandMiddleware) {
	if (!commandMiddleware)
	return [];
	return commandMiddleware.map(middleware => {
	middleware.applyBeforeValidation = false;
	return middleware;
	});
	}
	export function applyMiddleware(argv, yargs, middlewares, beforeValidation) {
	const beforeValidationError = new Error('middleware cannot return a promise when applyBeforeValidation is true');
	return middlewares.reduce((acc, middleware) => {
	if (middleware.applyBeforeValidation !== beforeValidation) {
	return acc;
	}
	if (isPromise(acc)) {
	return acc
	.then(initialObj => Promise.all([
	initialObj,
	middleware(initialObj, yargs),
	]))
	.then(([initialObj, middlewareObj]) => Object.assign(initialObj, middlewareObj));
	}
	else {
	const result = middleware(acc, yargs);
	if (beforeValidation && isPromise(result))
	throw beforeValidationError;
	return isPromise(result)
	? result.then(middlewareObj => Object.assign(acc, middlewareObj))
	: Object.assign(acc, result);
	}
	}, argv);
	}

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