extractUsername example

/** * Returns the username of the pre-authenticated user. * * This authenticator is skipped if null is returned or a custom * BadCredentialsException is thrown. */
    abstract protected function extractUsername(Request $request): ?string;

    public function supports(Request $request): ?bool
    {
        try {
            $username = $this->extractUsername($request);
        } catch (BadCredentialsException $e) {
            $this->clearToken($e);

            $this->logger?->debug('Skipping pre-authenticated authenticator as a BadCredentialsException is thrown.', ['exception' => $e, 'authenticator' => static::class]);

            return false;
        }

        if (null === $username) {
            $this->logger?->debug('Skipping pre-authenticated authenticator no username could be extracted.', ['authenticator' => static::class]);