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Edit File : middleware.js \| Size : 2.11 KB
'use strict' // hoisted due to circular dependency on command. module.exports = { applyMiddleware, commandMiddlewareFactory, globalMiddlewareFactory } const isPromise = require('./is-promise') const argsert = require('./argsert') 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 } } function commandMiddlewareFactory (commandMiddleware) { if (!commandMiddleware) return [] return commandMiddleware.map(middleware => { middleware.applyBeforeValidation = false return middleware }) } function applyMiddleware (argv, yargs, middlewares, beforeValidation) { const beforeValidationError = new Error('middleware cannot return a promise when applyBeforeValidation is true') return middlewares .reduce((accumulation, middleware) => { if (middleware.applyBeforeValidation !== beforeValidation) { return accumulation } if (isPromise(accumulation)) { return accumulation .then(initialObj => Promise.all([initialObj, middleware(initialObj, yargs)]) ) .then(([initialObj, middlewareObj]) => Object.assign(initialObj, middlewareObj) ) } else { const result = middleware(argv, yargs) if (beforeValidation && isPromise(result)) throw beforeValidationError return isPromise(result) ? result.then(middlewareObj => Object.assign(accumulation, middlewareObj)) : Object.assign(accumulation, result) } }, argv) } Back

Edit File : middleware.js | Size : 2.11 KB

'use strict'

// hoisted due to circular dependency on command.
module.exports = {
  applyMiddleware,
  commandMiddlewareFactory,
  globalMiddlewareFactory
}
const isPromise = require('./is-promise')
const argsert = require('./argsert')

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
  }
}

function commandMiddlewareFactory (commandMiddleware) {
  if (!commandMiddleware) return []
  return commandMiddleware.map(middleware => {
    middleware.applyBeforeValidation = false
    return middleware
  })
}

function applyMiddleware (argv, yargs, middlewares, beforeValidation) {
  const beforeValidationError = new Error('middleware cannot return a promise when applyBeforeValidation is true')
  return middlewares
    .reduce((accumulation, middleware) => {
      if (middleware.applyBeforeValidation !== beforeValidation) {
        return accumulation
      }

if (isPromise(accumulation)) {
        return accumulation
          .then(initialObj =>
            Promise.all([initialObj, middleware(initialObj, yargs)])
          )
          .then(([initialObj, middlewareObj]) =>
            Object.assign(initialObj, middlewareObj)
          )
      } else {
        const result = middleware(argv, yargs)
        if (beforeValidation && isPromise(result)) throw beforeValidationError

return isPromise(result)
          ? result.then(middlewareObj => Object.assign(accumulation, middlewareObj))
          : Object.assign(accumulation, result)
      }
    }, argv)
}

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