utils.js•1.67 kB
'use strict'
/**
* Module dependencies.
*/
var bytes = require('bytes')
var contentType = require('content-type')
var typeis = require('type-is')
/**
* Module exports.
*/
module.exports = {
getCharset,
normalizeOptions
}
/**
* Get the charset of a request.
*
* @param {object} req
* @api private
*/
function getCharset (req) {
try {
return (contentType.parse(req).parameters.charset || '').toLowerCase()
} catch {
return undefined
}
}
/**
* Get the simple type checker.
*
* @param {string | string[]} type
* @return {function}
*/
function typeChecker (type) {
return function checkType (req) {
return Boolean(typeis(req, type))
}
}
/**
* Normalizes the common options for all parsers.
*
* @param {object} options options to normalize
* @param {string | string[] | function} defaultType default content type(s) or a function to determine it
* @returns {object}
*/
function normalizeOptions (options, defaultType) {
if (!defaultType) {
// Parsers must define a default content type
throw new TypeError('defaultType must be provided')
}
var inflate = options?.inflate !== false
var limit = typeof options?.limit !== 'number'
? bytes.parse(options?.limit || '100kb')
: options?.limit
var type = options?.type || defaultType
var verify = options?.verify || false
if (verify !== false && typeof verify !== 'function') {
throw new TypeError('option verify must be function')
}
// create the appropriate type checking function
var shouldParse = typeof type !== 'function'
? typeChecker(type)
: type
return {
inflate,
limit,
verify,
shouldParse
}
}