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/**
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* @typedef {Object} TwitchToken
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* @property {String} access_token
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* @property {Number} expires_in
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* @property {String} token_type
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* @property {String} [refresh_token]
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* @property {Array<String>} [scope]
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* @property {Number} [obtainment_timestamp]
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* @property {Number} [user_id]
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*/
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/**
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* @typedef {Object} AuthCode
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* @property {String} code
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* @property {String} scope
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*/
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/**
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* @param {RequestInfo | URL} input
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* @param {RequestInit} init
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* @returns {Promise<Response>}
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*/
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function fetch(input,init=undefined){
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return window.fetch(input,init).catch(async error=>{
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if(error.message==="Failed to fetch"){
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await new Promise(function(resolve,reject){
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setTimeout(resolve,1000)
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})
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return fetch(input,init)
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}else{
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throw error
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}
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})
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}
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export default class TwitchAuth {
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static #redirect_uri=new URL('/code.html',import.meta.url)
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static #proxy_uri=new URL('/oauth2/token',import.meta.url)
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/**
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* https://dev.twitch.tv/docs/authentication/getting-tokens-oauth/#client-credentials-grant-flow
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* @param {String} client_id
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* @returns {Promise<TwitchToken>}
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*/
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static getAppToken(client_id){
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const searchParams=new URLSearchParams({
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client_id:client_id,
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grant_type:'client_credentials'
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})
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return fetch(this.#proxy_uri,{
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method:'POST',
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body:searchParams.toString(),
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headers:{'content-type':'application/x-www-form-urlencoded'}
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}).then(async function(response){
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if(!response.ok){
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throw await response.json()
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}
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return await response.json()
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})
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}
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/**
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* https://dev.twitch.tv/docs/authentication/getting-tokens-oauth/#get-the-user-to-authorize-your-app
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* @param {String} client_id
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* @param {Array<String>} scopes
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* @returns {Promise<AuthCode>}
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*/
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static requestAuthCode(client_id,...scopes){
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console.debug('requesting authorization code')
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const url=new URL(this.#redirect_uri)
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url.searchParams.append('client_id',client_id)
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url.searchParams.append('scope',scopes.join(' '))
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if(!open(url,'_blank')){
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throw new Error('failed to open authorization window')
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}
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return new Promise(function(resolve,reject){
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addEventListener("message",function onMessage(event){
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if(!(event.origin===new URL(import.meta.url).origin)){
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return
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}
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removeEventListener('message',onMessage)
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if('code' in event.data){
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resolve(event.data)
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}else{
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reject(event.data)
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}
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})
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})
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}
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/**
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* https://dev.twitch.tv/docs/authentication/getting-tokens-oauth/#use-the-authorization-code-to-get-a-token
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* @param {String} client_id
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* @param {String} code
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* @returns {Promise<TwitchToken>}
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*/
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static exchangeCode(client_id,code){
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console.debug('exchanging authorization code')
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const searchParams=new URLSearchParams({
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client_id:client_id,
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code:code,
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grant_type:'authorization_code'
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})
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return fetch(this.#proxy_uri,{
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method:'POST',
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body:searchParams.toString()+'&redirect_uri='+this.#redirect_uri,
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headers:{'content-type':'application/x-www-form-urlencoded'}
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}).then(async function(response){
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if(!response.ok){
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throw await response.json()
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}
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return await response.json()
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})
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}
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/**
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* https://dev.twitch.tv/docs/authentication/validate-tokens/#how-to-validate-a-token
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* @param {String} access_token
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* @returns {Promise<TwitchToken>}
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*/
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static validateToken(access_token){
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console.debug('validating token')
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return fetch('https://id.twitch.tv/oauth2/validate',{
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headers:{authorization:'OAuth '+access_token}
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}).then(async response=>{
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if(!response.ok){
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throw await response.json()
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}
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return await response.json()
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})
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}
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/**
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* https://dev.twitch.tv/docs/authentication/refresh-tokens/#how-to-use-a-refresh-token
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* @param {String} client_id
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* @param {String} refresh_token
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* @returns {Promise<TwitchToken>}
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*/
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static refreshToken(client_id,refresh_token){
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console.debug('refreshing token')
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const searchParams=new URLSearchParams({
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client_id:client_id,
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grant_type:'refresh_token',
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refresh_token:refresh_token
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})
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return fetch(this.#proxy_uri,{
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method:'POST',
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body:searchParams.toString(),
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headers:{'content-type':'application/x-www-form-urlencoded'}
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}).then(async function(response){
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if(!response.ok){
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throw await response.json()
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}
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return await response.json()
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})
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}
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/**
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* validate, update, and return an existing token
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* @param {TwitchToken} token
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* @returns {Promise<TwitchToken>}
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*/
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static getTokenWithValidation(token){
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return this.validateToken(token.access_token)
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.then(validation=>{
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Object.assign(validation,token)
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validation.obtainment_timestamp=Date.now()
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return validation
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})
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}
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constructor(client_id){
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this.client_id=client_id
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}
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/**
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* get the cached token
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* @returns {TwitchToken}
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*/
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getLocalToken(){
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const data=localStorage.getItem(import.meta.url)
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if(!data){
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return null
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}
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return JSON.parse(data)
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}
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resetLocalToken(){
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return localStorage.removeItem(import.meta.url)
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}
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/**
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* Do whatever it takes to get a token
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* @param {Array<String>} scopes
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* @returns {Promise<TwitchToken>}
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*/
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async getToken(...scopes){
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const token=this.getLocalToken()
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if(!token){
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console.debug('no local token, requesting new token')
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return this.getNewToken(...scopes)
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}
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scopes=scopes.join(' ').split(' ')
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for(const scope of scopes){
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if(scope===''){
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continue
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}
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if(!token.scope.includes(scope)){
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console.debug('token is missing '+scope+', requesting new token')
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return this.getNewToken(...scopes)
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}
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}
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const expiry=token.obtainment_timestamp+(token.expires_in*1000)-(60*1000)
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if(expiry<Date.now()){
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return this.getFreshToken(token)
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}
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return token
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}
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/**
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* Interactively request a new token
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* @param {Array<String>} scopes
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* @returns {Promise<TwitchToken>}
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*/
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getNewToken(...scopes){
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return TwitchAuth.requestAuthCode(this.client_id,...scopes)
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.then(response=>TwitchAuth.exchangeCode(this.client_id,response.code))
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.then(this.setToken)
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}
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/**
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* Non-interactively request a new token, falling back to interactive mode
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* @param {TwitchToken} token
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* @returns {Promise<TwitchToken>}
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*/
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getFreshToken(token){
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return TwitchAuth.refreshToken(this.client_id,token.refresh_token)
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.then(this.setToken).catch((error)=>{
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console.warn(error)
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return this.getNewToken(...token.scope)
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})
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}
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/**
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* validate, update, store, and return an existing token
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* @param {TwitchToken} token
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* @returns {Promise<TwitchToken>}
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*/
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setToken(token){
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return TwitchAuth.getTokenWithValidation(token)
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.then(token=>{
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localStorage.setItem(import.meta.url,JSON.stringify(token))
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return token
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})
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}
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/**
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* Get a new app token with validation
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* @returns {Promise<TwitchToken>}
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*/
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getAppToken(){
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return TwitchAuth.getAppToken(this.client_id)
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.then(TwitchAuth.getTokenWithValidation)
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}
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}
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