66 lines
2.1 KiB
JavaScript
66 lines
2.1 KiB
JavaScript
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'use strict'
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// hoisted due to circular dependency on command.
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module.exports = {
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applyMiddleware,
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commandMiddlewareFactory,
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globalMiddlewareFactory
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}
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const isPromise = require('./is-promise')
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const argsert = require('./argsert')
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function globalMiddlewareFactory (globalMiddleware, context) {
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return function (callback, applyBeforeValidation = false) {
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argsert('<array|function> [boolean]', [callback, applyBeforeValidation], arguments.length)
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if (Array.isArray(callback)) {
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for (let i = 0; i < callback.length; i++) {
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if (typeof callback[i] !== 'function') {
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throw Error('middleware must be a function')
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}
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callback[i].applyBeforeValidation = applyBeforeValidation
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}
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Array.prototype.push.apply(globalMiddleware, callback)
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} else if (typeof callback === 'function') {
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callback.applyBeforeValidation = applyBeforeValidation
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globalMiddleware.push(callback)
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}
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return context
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}
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}
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function commandMiddlewareFactory (commandMiddleware) {
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if (!commandMiddleware) return []
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return commandMiddleware.map(middleware => {
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middleware.applyBeforeValidation = false
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return middleware
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})
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}
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function applyMiddleware (argv, yargs, middlewares, beforeValidation) {
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const beforeValidationError = new Error('middleware cannot return a promise when applyBeforeValidation is true')
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return middlewares
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.reduce((accumulation, middleware) => {
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if (middleware.applyBeforeValidation !== beforeValidation &&
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!isPromise(accumulation)) {
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return accumulation
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}
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if (isPromise(accumulation)) {
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return accumulation
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.then(initialObj =>
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Promise.all([initialObj, middleware(initialObj, yargs)])
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)
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.then(([initialObj, middlewareObj]) =>
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Object.assign(initialObj, middlewareObj)
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)
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} else {
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const result = middleware(argv, yargs)
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if (beforeValidation && isPromise(result)) throw beforeValidationError
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return isPromise(result)
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? result.then(middlewareObj => Object.assign(accumulation, middlewareObj))
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: Object.assign(accumulation, result)
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}
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}, argv)
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}
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