feed.php

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<?php

include_once "Services/Context/classes/class.ilContext.php";
ilContext::init(ilContext::CONTEXT_RSS);

require_once("Services/Init/classes/class.ilInitialisation.php");
ilInitialisation::initILIAS();
global $DIC;

$getPar = static function (string $key, string $func) {
    global $DIC;
    return $DIC->http()->wrapper()->query()->has($key)
        ? $DIC->http()->wrapper()->query()->retrieve(
            $key,
            $DIC->refinery()->kindlyTo()->$func()
        ) : ($func === "int" ? 0 : '');
};

$requested_user_id = $getPar("user_id", "int");
$requested_ref_id = $getPar("ref_id", "int");
$requested_purpose = $getPar("purpose", "string");
$requested_blog_id = $getPar("blog_id", "string");
$requested_hash = $getPar("hash", "string");

if ($requested_user_id > 0) {
    $writer = new ilUserFeedWriter($requested_user_id, $requested_hash);
    $writer->showFeed();
} elseif ($requested_ref_id > 0) {
    $writer = new ilObjectFeedWriter($requested_ref_id, false, $requested_purpose);
    $writer->showFeed();
} elseif ($requested_blog_id > 0) {
    ilObjBlog::deliverRSS($requested_blog_id);
}