Base64 Encoding of credentials in backend .jsw

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1

I am trying to authorise my site through an API. The API requires the authorisation header which should, as per their specification, be:

authorization: "Basic " + base64encode(client_id + “:” + client_secret)

I am aware that the web modules do not support window.btoa or Buffer. My code is as follows. I have tried installing various packages but continue to get {error: “invalid_client”} from the API.

const clientsecret = "XXXX"
const clientid = "XXXX"
const url = 'https://identity.xero.com/connect/token';
const redirecturi = 'https://www.someurl.co.uk/oauth';

export function exchangecode(code) {

 const authorizationBasic = window.btoa(clientid + ":" + clientsecret);

 let headers = {
 'Authorization': 'Basic ' + authorizationBasic,
 'Content-Type': 'application/x-www-form-urlencoded'
    };

 let data = 'grant_type=authorization_code&code=' + code + '&redirect_uri=https://www.someurl.co.uk/oauth'

 let request = {
 "method": 'post',
 "headers": headers,
 "body": JSON.stringify(data)
    };

 return fetch(url, request)
        .then((httpResponse) => {
 return httpResponse.json()
        })
}

Does anyone have a working example of encoding credentials for a post request or can anyone shed any light on where I’m going wrong.

2

You can install the necessary NPMs such as buffer, btoa or base-64.