export_handler.php

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<?php
require_once(dirname(dirname(__FILE__)) . "/start.php");


// Get input values, these will be mapped via modrewrite
$guid = get_input("guid"); // guid of the entity

// For attributes eg http://example.com/odd/73/attr/owner_uuid/
// or http://example.com/odd/73/metadata/86/
$type = get_input("type"); // attr, metadata, annotation, relationship
$id_or_name = get_input("idname"); // Either a number or the key name (if attribute)

$body = "";
$title = "";

// Only export the GUID
if (($guid != "") && ($type == "") && ($id_or_name == "")) {
    $entity = get_entity($guid);

    if (!$entity) {
        $query = "GUID:" . $guid . " could not be found, or you can not access it.";
        throw new \InvalidParameterException($query);
    }

    $title = "GUID:$guid";
    $body = elgg_view("export/entity", array("entity" => $entity, "uuid" => guid_to_uuid($guid)));

    // Export an individual attribute
} else if (($guid != "") && ($type != "") && ($id_or_name != "")) {
    // Get a uuid
    $entity = get_entity($guid);
    if (!$entity) {
        $msg = "GUID:" . $guid . " could not be found, or you can not access it.";
        throw new \InvalidParameterException($msg);
    }

    $uuid = guid_to_uuid($entity->getGUID()) . "$type/$id_or_name/";

    switch ($type) {
        case 'attr' : // @todo: Do this better? - This is a bit of a hack...
            $v = $entity->get($id_or_name);
            if (!$v) {
                $msg = "Sorry, '" . $id_or_name . "' does not exist for guid:" . $guid;
                throw new \InvalidParameterException($msg);
            }

            $m = new \ElggMetadata();

            $m->value = $v;
            $m->name = $id_or_name;
            $m->entity_guid = $guid;
            $m->time_created = $entity->time_created;
            $m->time_updated = $entity->time_updated;
            $m->owner_guid = $entity->owner_guid;
            $m->id = $id_or_name;
            $m->type = "attr";
            break;
        case 'metadata' :
            $m = elgg_get_metadata_from_id($id_or_name);
            break;
        case 'annotation' :
            $m = elgg_get_annotation_from_id($id_or_name);
            break;
        case 'relationship' :
            $r = get_relationship($id_or_name);
            break;
        case 'volatile' :
            $m = elgg_trigger_plugin_hook('volatile', 'metadata', array(
                'guid' => $guid,
                'varname' => $id_or_name,
            ));
            break;

        default :
            $msg = "Sorry, I don't know how to export '" . $type . "'";
            throw new \InvalidParameterException($msg);
    }

    // Render metadata or relationship
    if ((!$m) && (!$r)) {
        throw new \InvalidParameterException("Could not find any data.");
    }

    // Exporting metadata?
    if ($m) {
        if ($m->entity_guid != $entity->guid) {
            throw new \InvalidParameterException("Does not belong to entity.");
        }

        $title = "$type:$id_or_name";
        $body = elgg_view("export/metadata", array("metadata" => $m, "uuid" => $uuid));
    }

    // Exporting relationship
    if ($r) {
        if (($r->guid_one != $entity->guid) && ($r->guid_two != $entity->guid)) {
            throw new \InvalidParameterException("Does not belong to entity or refer to entity.");
        }

        $title = "$type:$id_or_name";
        $body = elgg_view("export/relationship", array("relationship" => $r, "uuid" => $uuid));
    }

    // Something went wrong
} else {
    throw new \InvalidParameterException("Missing parameter, you need to provide a GUID.");
}

$body = elgg_view_layout('one_sidebar', array(
    'title' => $title,
    'content' => $body
));
echo elgg_view_page($title, $body);