comments.php

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<?php
function _elgg_comments_init() {
    elgg_register_entity_type('object', 'comment');
    elgg_register_plugin_hook_handler('register', 'menu:entity', '_elgg_comment_setup_entity_menu', 900);
    elgg_register_plugin_hook_handler('entity:url', 'object', '_elgg_comment_url_handler');
    elgg_register_plugin_hook_handler('container_permissions_check', 'object', '_elgg_comments_container_permissions_override');
    elgg_register_plugin_hook_handler('permissions_check', 'object', '_elgg_comments_permissions_override');
    elgg_register_plugin_hook_handler('email', 'system', '_elgg_comments_notification_email_subject');
    
    elgg_register_event_handler('update:after', 'all', '_elgg_comments_access_sync', 600);

    elgg_register_page_handler('comment', '_elgg_comments_page_handler');

    elgg_register_ajax_view('core/ajax/edit_comment');

    elgg_register_plugin_hook_handler('likes:is_likable', 'object:comment', 'Elgg\Values::getTrue');
}

function _elgg_comments_page_handler($segments) {

    $page = elgg_extract(0, $segments);
    switch ($page) {

        case 'edit':
            echo elgg_view_resource('comments/edit', [
                'guid' => elgg_extract(1, $segments),
            ]);
            return true;
            break;

        case 'view':
            _elgg_comment_redirect(elgg_extract(1, $segments), elgg_extract(2, $segments));
            break;

        default:
            return false;
            break;
    }
}

function _elgg_comment_redirect($comment_guid, $fallback_guid) {
    $fail = function () {
        register_error(elgg_echo('generic_comment:notfound'));
        forward(REFERER);
    };

    $comment = get_entity($comment_guid);
    if (!$comment) {
        // try fallback if given
        $fallback = get_entity($fallback_guid);
        if (!$fallback) {
            $fail();
        }

        register_error(elgg_echo('generic_comment:notfound_fallback'));
        forward($fallback->getURL());
    }

    if (!elgg_instanceof($comment, 'object', 'comment')) {
        $fail();
    }

    $container = $comment->getContainerEntity();
    if (!$container) {
        $fail();
    }

    // this won't work with threaded comments, but core doesn't support that yet
    $count = elgg_get_entities([
        'type' => 'object',
        'subtype' => 'comment',
        'container_guid' => $container->guid,
        'count' => true,
        'wheres' => ["e.guid < " . (int)$comment->guid],
    ]);
    $limit = (int)get_input('limit');
    if (!$limit) {
        $limit = elgg_trigger_plugin_hook('config', 'comments_per_page', [], 25);
    }
    $offset = floor($count / $limit) * $limit;
    if (!$offset) {
        $offset = null;
    }

    $url = elgg_http_add_url_query_elements($container->getURL(), [
        'offset' => $offset,
    ]);
    
    // make sure there's only one fragment (#)
    $parts = parse_url($url);
    $parts['fragment'] = "elgg-object-{$comment->guid}";
    $url = elgg_http_build_url($parts, false);
    
    forward($url);
}

function _elgg_comment_setup_entity_menu($hook, $type, $return, $params) {
    if (elgg_in_context('widgets')) {
        return $return;
    }

    $entity = $params['entity'];
    if (!elgg_instanceof($entity, 'object', 'comment')) {
        return $return;
    }

    // Remove edit link and access level from the menu
    foreach ($return as $key => $item) {
        if ($item->getName() === 'access') {
            unset($return[$key]);
        }
    }

    return $return;
}

function _elgg_comment_url_handler($hook, $type, $return, $params) {
    $entity = $params['entity'];
    /* @var \ElggObject $entity */

    if (!elgg_instanceof($entity, 'object', 'comment') || !$entity->getOwnerEntity()) {
        // not a comment or has no owner

        // @todo handle anonymous comments
        return $return;
    }

    $container = $entity->getContainerEntity();
    if (!$container) {
        return $return;
    }

    return "comment/view/{$entity->guid}/{$container->guid}";
}

function _elgg_comments_container_permissions_override($hook, $type, $return, $params) {

    // is someone trying to comment, if so override permissions check
    if ($params['subtype'] === 'comment') {
        return true;
    }

    return $return;
}

function _elgg_comments_permissions_override($hook, $type, $return, $params) {
    $entity = $params['entity'];
    $user = $params['user'];
    
    if (elgg_instanceof($entity, 'object', 'comment') && $user) {
        return $entity->getOwnerGUID() == $user->getGUID();
    }
    
    return $return;
}

function _elgg_comments_notification_email_subject($hook, $type, $returnvalue, $params) {
    if (!is_array($returnvalue) || !is_array($returnvalue['params'])) {
        // another hook handler returned a non-array, let's not override it
        return;
    }

    if (empty($returnvalue['params']['notification'])) {
        return;
    }
    
    $notification = $returnvalue['params']['notification'];

    if ($notification instanceof Elgg\Notifications\Notification) {
        $object = elgg_extract('object', $notification->params);

        if ($object instanceof ElggComment) {
            $container = $object->getContainerEntity();

            $returnvalue['subject'] = 'Re: ' . $container->getDisplayName();
        }
    }

    return $returnvalue;
}

function _elgg_comments_access_sync($event, $type, $entity) {
    if (!($entity instanceof \ElggEntity)) {
        return true;
    }
    
    // need to override access in case comments ended up with ACCESS_PRIVATE
    // and to ensure write permissions
    $ia = elgg_set_ignore_access(true);
    $options = array(
        'type' => 'object',
        'subtype' => 'comment',
        'container_guid' => $entity->getGUID(),
        'wheres' => array(
            "e.access_id != {$entity->access_id}"
        ),
        'limit' => 0,
    );

    $batch = new \ElggBatch('elgg_get_entities', $options, null, 25, false);
    foreach ($batch as $comment) {
        // Update comment access_id
        $comment->access_id = $entity->access_id;
        $comment->save();
    }
        
    elgg_set_ignore_access($ia);
    
    return true;
}

function _elgg_comments_test($hook, $type, $value, $params) {
    global $CONFIG;
    $value[] = "{$CONFIG->path}engine/tests/ElggCommentTest.php";
    return $value;
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $events->registerHandler('init', 'system', '_elgg_comments_init');
    $hooks->registerHandler('unit_test', 'system', '_elgg_comments_test');
};