WebAuthnRESTHelpers.js

let performGetAssertion = (getAssertionRequest) => {
    getAssertionRequest.challenge = base64url.decode(getAssertionRequest.challenge);

    if(getAssertionRequest.allowCredentials) { //If RK scenario
        for(let allowCred of getAssertionRequest.allowCredentials) {
            allowCred.id = base64url.decode(allowCred.id);
        }
    }

    return getAssertionRequest
}

let preformatMakeCredReq = (makeCredentialRequest) => {
    makeCredentialRequest.challenge = base64url.decode(makeCredentialRequest.challenge);
    makeCredentialRequest.user.id   = base64url.decode(makeCredentialRequest.user.id);

    if(makeCredentialRequest.excludeCredentials) {
        for(let excludeCred of makeCredentialRequest.excludeCredentials) {
            excludeCred.id = base64url.decode(excludeCred.id);
        }
    }

    return makeCredentialRequest
}

let publicKeyCredentialToJSON = (pubKeyCred) => {
    if(pubKeyCred instanceof Array) {
        let arr = [];
        for(let i of pubKeyCred)
            arr.push(publicKeyCredentialToJSON(i));

        return arr
    }

    if(pubKeyCred instanceof ArrayBuffer) {
        return base64url.encode(pubKeyCred)
    }

    if(pubKeyCred instanceof Object) {
        let obj = {};

        for (let key in pubKeyCred) {
            obj[key] = publicKeyCredentialToJSON(pubKeyCred[key])
        }

        return obj
    }

    return pubKeyCred
}