django - Can't understand WebAuthn API error from JavaScript - Stack Overflow

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I am currently building out an AJAX registration endpoint for Django to allow for FIDO2 authentication (physical hardware key login). This is from following the example/documentation from Yubico's official fido2 python library.

The only dependencies are cbor.js and js-cookie. Everything server-side is working for now, however, I keep getting this JavaScript error while invoking the navigator.credentials.create method

TypeError: Failed to execute 'create' on 
'CredentialsContainer': The provided value is not of 
type '(ArrayBuffer or ArrayBufferView)'

The code:

var csrftoken = Cookies.get('csrftoken');
fetch('/register/begin', {
    method: 'POST',
    headers: {
        'X-CSRFToken': csrftoken
    }
}).then(function(response) {
    if(response.ok) {
        return response.arrayBuffer();
    }
    throw new Error('Error getting registration data!');

}).then(CBOR.decode).then(function(options) {
    console.log(options)
    //This line is not working
    return navigator.credentials.create(options);
//More code... plete registration...

I can't figure this out. Do you know whats wrong? Thanks!

I am currently building out an AJAX registration endpoint for Django to allow for FIDO2 authentication (physical hardware key login). This is from following the example/documentation from Yubico's official fido2 python library.

The only dependencies are cbor.js and js-cookie. Everything server-side is working for now, however, I keep getting this JavaScript error while invoking the navigator.credentials.create method

TypeError: Failed to execute 'create' on 
'CredentialsContainer': The provided value is not of 
type '(ArrayBuffer or ArrayBufferView)'

The code:

var csrftoken = Cookies.get('csrftoken');
fetch('/register/begin', {
    method: 'POST',
    headers: {
        'X-CSRFToken': csrftoken
    }
}).then(function(response) {
    if(response.ok) {
        return response.arrayBuffer();
    }
    throw new Error('Error getting registration data!');

}).then(CBOR.decode).then(function(options) {
    console.log(options)
    //This line is not working
    return navigator.credentials.create(options);
//More code... plete registration...

I can't figure this out. Do you know whats wrong? Thanks!

• javascript
• django
• yubico
• cbor
• webauthn

Share Improve this question Follow asked Dec 27, 2018 at 23:24 CodyCody 33911 gold badge44 silver badges1616 bronze badges

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2 Answers 2

Sorted by: Reset to default 7

I had the same problem, and the cause was that some of the pieces of data sent from the server in the response from /register/begin must be formatted as byte strings rather than unicode strings. In particular, I've found that the user_id and the credential ids have to be byte strings - assuming that you are also following Yubico's example in the server, implemented in python 3.

Also of note is that in this case I've found Firefox's error messages much more helpful than chome's.

I was having this issue as well. I ended up using the TextEncoder class to encode the challenge and the user id...

        const enc = new TextEncoder();     
        const createCredentialOptions: CredentialCreationOptions = {
        publicKey: {
          rp: rp,
          challenge: enc.encode(challenge),
          user: {
            id: enc.encode(user.id),
            name: user.name,
            displayName: user.displayName
          },
          pubKeyCredParams: pubKeyCredParams,
          ...

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