@goa/negotiator

@goa/negotiator is a fork of HTTP Content Negotiation In ES6 And Optimised With A JavaScript Compiler For The Best Performance.

The original module has been updated to be used in @goa/koa: Koa web server compiled with Google Closure Compiler using Depack into a single file library (0 dependencies).

yarn add @goa/negotiator

Table Of Contents

• Table Of Contents
• API
• class Negotiator
• constructor(request: IncomingMessage): Negotiator
  • _goa.Negotiator
• Copyright

API

The package is available by importing its default function:

import Negotiator from '@goa/negotiator'

class Negotiator

Instances of this class will allow to negotiate languages, charsets, media types and encodings.

constructor(
  request: IncomingMessage,
): Negotiator

Creates a new instance based on the request from the client.

/* alanode example/ */
import aqt from '@rqt/aqt'
import { createServer } from 'http'
import Negotiator from '@goa/negotiator'

const s = createServer((message, response) => {
  const n = new Negotiator(message)

  const availableEncodings = ['identity', 'gzip']
  console.log('encodings', n.encodings())
  console.log('available encodings', n.encodings(availableEncodings))
  console.log('encoding', n.encoding(availableEncodings), '\n')

  const availableLanguages = ['en', 'es', 'fr']
  console.log('languages', n.languages())
  console.log('available languages', n.languages(availableLanguages))
  console.log('language', n.language(availableLanguages), '\n')

  const availableCharsets = ['utf-8', 'iso-8859-1', 'iso-8859-5']
  console.log('charsets', n.charsets())
  console.log('available charsets', n.charsets(availableCharsets))
  console.log('charset', n.charset(availableCharsets), '\n')

  const availableMediaTypes = ['text/html', 'text/plain', 'application/json']
  console.log('media types', n.mediaTypes())
  console.log('available media types', n.mediaTypes(availableMediaTypes))
  console.log('media type', n.mediaType(availableMediaTypes))

  response.end()
})

s.listen(0, async () => {
  const url = `http://localhost:${s.address().port}`
  await aqt(url, {
    headers: {
      'accept-encoding': 'gzip, compress;q=0.2, identity;q=0.5',
      'accept-charset': 'utf-8, iso-8859-1;q=0.8, utf-7;q=0.2',
      'accept-language': 'en;q=0.8, es, pt',
      accept: 'text/html, application/*;q=0.2, image/jpeg;q=0.8',
    },
  })
  s.close()
})

encodings [ 'gzip', 'deflate', 'identity' ]
available encodings [ 'gzip', 'identity' ]
encoding gzip 

languages [ 'es', 'pt', 'en' ]
available languages [ 'es', 'en' ]
language es 

charsets [ 'utf-8', 'iso-8859-1', 'utf-7' ]
available charsets [ 'utf-8', 'iso-8859-1' ]
charset utf-8 

media types [ 'text/html', 'image/jpeg', 'application/*' ]
available media types [ 'text/html', 'application/json' ]
media type text/html

_goa.Negotiator: HTTP Content Negotiation In ES6.

Name	Type	Description
charset*	function(!Array<string>=): string	Returns the most preferred charset from the client.
charsets*	function(!Array<string>=): !Array<string>	Returns an array of preferred charsets ordered by the client preference.
encoding*	function(!Array<string>=): string	Returns the most preferred encoding from the client.
encodings*	function(!Array<string>=): !Array<string>	Returns an array of preferred encodings ordered by the client preference.
language*	function(!Array<string>=): string	Returns the most preferred language from the client.
languages*	function(!Array<string>=): !Array<string>	Returns an array of preferred languages ordered by priority from a list of available languages.
mediaType*	function(!Array<string>=): string	Returns the most preferred media type from the client.
mediaTypes*	function(!Array<string>=): !Array<string>	Returns an array of preferred media types ordered by priority from a list of available media types.

Copyright

The original programming work, documentation and NPM package by Federico Romero, Isaac Z. Schlueter, Douglas Christopher Wilson.

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