Added .well-known/openid-configuration endpoint

<?php

namespace RAP;

class OIDCDiscoveryGenerator {

    private $locator;

    public function __construct(Locator $locator) {

        $this->locator = $locator;

    }

    public function getConfiguration() {

        $config = $this->locator->config;

        $discoveryConfig = [];

        $host = filter_input(INPUT_SERVER, 'HTTP_HOST', FILTER_SANITIZE_STRING);

        $baseUrl = 'https://' . $host . $config->contextRoot;

        $discoveryConfig['issuer'] = $baseUrl;

        $discoveryConfig['authorization_endpoint'] = $baseUrl . '/auth/oauth2/authorize';

        $discoveryConfig['token_endpoint'] = $baseUrl . '/auth/oauth2/token';

        $discoveryConfig['jwks_uri'] = $baseUrl . '/auth/oidc/jwks';

        $discoveryConfig['scopes_supported'] = ['openid', 'email', 'profile'];

        $discoveryConfig['grant_types_supported'] = ['authorization_code', 'client_credentials', 'refresh_token', 'urn:ietf:params:oauth:grant-type:token-exchange'];

        $discoveryConfig['id_token_signing_alg_values_supported'] = ['RS256'];

        $discoveryConfig['claims_supported'] = ['sub', 'iss', 'iat', 'exp', 'name', 'aud', 'email', 'given_name', 'family_name', 'org'];

        return $discoveryConfig;

    }

}

        'model' => $authPageModel));

}

Flight::route('GET /.well-known/openid-configuration', function() {

    global $locator;

    $discoveryGen = new RAP\OIDCDiscoveryGenerator($locator);

    Flight::json($discoveryGen->getConfiguration());

});

Flight::route('GET /auth/oauth2/authorize', function() {

    session_start();