shibd_discofeed.class.php

<?php
/**
 * ======================================================================
 * 
 * AAI LOGIN WITH SHIBBOLETH HANDLING MULTIPLE ORGANIZATIONS
 * 
 * included functions
 * License: GNU GPL 3.0
 * Source: https://git-repo.iml.unibe.ch/iml-open-source/login-aai
 * ======================================================================
 */
class shibd_discofeed
{
    /**
     * Url to the discofeed that returns a json with al idps
     * @var string
     */
    protected string $_sDiscofeedUrl = '/Shibboleth.sso/DiscoFeed';

    /**
     * Url to generate a static Shibboleth login url
     * @var string
     */
    protected string $_sShibLoginUrl = '/Shibboleth.sso/Login';

    /**
     * Language to search for in the discofeed; a 2 letter code
     * @var string
     */
    protected string $lang = 'en';

    // caching of discofeed

    /**
     * Filename of the cache file for the Shibboleth discofeed
     * @var string
     */
    protected string $_sCachefile = 'discofeed.json';

    /**
     * Caching time for the discofeed cache in seconds
     * @var int
     */
    protected int $_iCacheTtl;

    /**
     * Self base URL of the current app tu build Shibboleth links
     * @var string
     */
    protected string $SELFURL = '';
    // protected array $aConfig = [];

    // ----------------------------------------------------------------------

    /**
     * Constructor
     * @param array $aConfig  config array; the following keys are required:
     *                        idps        array   IDP poositive list
     *                        return-url  string  return URL
     *                        cache-ttl   int     caching time in seconds
     *                        cachefile   string  caching filename
     * @param string $SELFURL
     */
    public function __construct(array $aConfig, string $SELFURL = '')
    {
        $SELFURL = $SELFURL ?: (
            isset($_SERVER['SERVER_NAME']) ? "https://" . $_SERVER['SERVER_NAME'] : ''
        );

        if(!$SELFURL) {