save.php

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<?php
$guid = (int) get_input('guid');
$params = (array) get_input('params');
$default_widgets = (int) get_input('default_widgets', 0);
$context = get_input('context');

$widget = get_entity($guid);
if (!$widget instanceof \ElggWidget) {
    return elgg_error_response(elgg_echo('error:missing_data'));
}

if (!$widget->canEdit()) {
    return elgg_error_response(elgg_echo('actionunauthorized'));
}

foreach ($params as $name => $value) {
    $widget->$name = $value;
}

// trigger save for cache invalidation
$widget->save();

$context_stack = [];

if ($default_widgets) {
    $context_stack[] = 'default_widgets';
}

$context_stack[] = 'widgets';
if ($context) {
    $context_stack[] = $context;
}

foreach ($context_stack as $ctx) {
    elgg_push_context($ctx);
}

elgg_set_page_owner_guid($widget->getContainerGUID());

$output = [
    'content' => elgg_view('object/widget/elements/content', ['entity' => $widget]),
    'title' => $widget->getDisplayName(),
    'href' => $widget->getURL(),
];
foreach ($context_stack as $ctx) {
    elgg_pop_context();
}

return elgg_ok_response($output);