CommentEntityRedirector.php

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<?php

namespace Elgg\Controllers;

use Elgg\Database\QueryBuilder;
use Elgg\Exceptions\Http\EntityNotFoundException;
use Elgg\Http\ResponseBuilder;
use Elgg\Request;

class CommentEntityRedirector {
    
    public function __invoke(Request $request) {
        
        $comment_guid = (int) $request->getParam('guid');
        $fallback_guid = (int) $request->getParam('container_guid');
        
        $comment = get_entity($comment_guid);
        if (!$comment instanceof \ElggComment) {
            // try fallback if given
            $fallback = get_entity($fallback_guid);
            if (!$fallback instanceof \ElggEntity) {
                throw new EntityNotFoundException(elgg_echo('generic_comment:notfound'));
            }
            
            return elgg_redirect_response($fallback->getURL());
        }
        
        $top_comment = $comment->getThreadEntity();
        if (!$top_comment instanceof \ElggComment) {
            throw new EntityNotFoundException(elgg_echo('generic_comment:notfound'));
        }
        
        $container = $comment->getContainerEntity();
        if (!$container instanceof \ElggEntity) {
            throw new EntityNotFoundException(elgg_echo('generic_comment:notfound'));
        }
        
        $operator = elgg_comments_are_latest_first($container) ? '>' : '<';
        
        $count = elgg_count_entities([
            'type' => 'object',
            'subtype' => 'comment',
            'container_guid' => $container->guid,
            'metadata_name_value_pairs' => ['level' => 1],
            'wheres' => [
                function(QueryBuilder $qb, $main_alias) use ($top_comment, $operator) {
                    return $qb->compare("{$main_alias}.guid", $operator, $top_comment->guid, ELGG_VALUE_GUID);
                },
            ],
        ]);
        
        $limit = (int) get_input('limit');
        if ($limit < 1) {
            $limit = elgg_comments_per_page($container);
        }
        
        $offset = floor($count / $limit) * $limit;
        if ($offset < 1) {
            $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);
        
        return elgg_redirect_response($url);
    }
}