Client Initiated Account Linking

keycloak-link.js

$.getScript('https://rawgit.com/auth0/jwt-decode/master/build/jwt-decode.js')
$.getScript('https://rawgit.com/emn178/js-sha256/master/build/sha256.min.js')

var realm = 'b2a'
var provider = 'facebook'
var auth = JSON.parse(window.sessionStorage.getItem(window.sessionStorage.key(0)))
var token = jwt_decode(auth.access_token)
var session = token.session_state
var client_id = token.aud
var nonce = Date.now()
var input = '' + nonce + session + client_id + provider
var inputArrayBuffer = new TextEncoder('utf-8').encode(input)
var check = sha256.array(inputArrayBuffer)
var test = String.fromCharCode.apply(null, new Uint8Array(check))
var base64string = window.btoa(test)
var hash = base64string.replace(/\+/g, '-').replace(/\//g, '_')

var redirect_uri = window.location.href

var url = `http://localhost:8080/auth/realms/${realm}/broker/${provider}/link?client_id=${client_id}&redirect_uri=${redirect_uri}&nonce=${nonce}&hash=${hash}`