AddFaviconLinksHandler.php

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<?php

namespace Elgg\Page;

class AddFaviconLinksHandler {
    
    public function __invoke(\Elgg\Hook $hook) {
        $head_params = $hook->getValue();
        
        if (elgg_get_site_entity()->hasIcon('master', 'favicon')) {
            $config = $this->getSiteIcons();
        } else {
            $config = $this->getDefaultIcons();
        }
        
        foreach ($config as $name => $link) {
            $head_params['links'][$name] = $link;
        }
        
        return $head_params;
    }
    
    protected function getDefaultIcons(): array {
        return [
            'apple-touch-icon' => [
                'rel' => 'apple-touch-icon',
                'type' => 'image/png',
                'href' => elgg_get_simplecache_url('graphics/favicon-128.png'),
            ],
            'icon-ico' => [
                'rel' => 'icon',
                'href' => elgg_get_simplecache_url('graphics/favicon.ico'),
            ],
            'icon-16' => [
                'rel' => 'icon',
                'sizes' => '16x16',
                'type' => 'image/png',
                'href' => elgg_get_simplecache_url('graphics/favicon-16.png'),
            ],
            'icon-32' => [
                'rel' => 'icon',
                'sizes' => '32x32',
                'type' => 'image/png',
                'href' => elgg_get_simplecache_url('graphics/favicon-32.png'),
            ],
            'icon-64' => [
                'rel' => 'icon',
                'sizes' => '64x64',
                'type' => 'image/png',
                'href' => elgg_get_simplecache_url('graphics/favicon-64.png'),
            ],
            'icon-128' => [
                'rel' => 'icon',
                'sizes' => '128x128',
                'type' => 'image/png',
                'href' => elgg_get_simplecache_url('graphics/favicon-128.png'),
            ],
        ];
    }
    
    protected function getSiteIcons(): array {
        $site = elgg_get_site_entity();
        
        $sizes = elgg_get_icon_sizes('site', null, 'favicon');
        unset($sizes['master']);
        
        $result = [];
        
        if (isset($sizes['icon-128'])) {
            $result['apple-touch-icon'] = [
                'rel' => 'apple-touch-icon',
                'type' => 'image/jpeg',
                'href' => $site->getIconURL(['size' => 'icon-128', 'type' => 'favicon']),
            ];
        }

        if (isset($sizes['icon-32'])) {
            $result['icon-ico'] = [
                'rel' => 'icon',
                'href' => $site->getIconURL(['size' => 'icon-32', 'type' => 'favicon']),
            ];
        }
        
        foreach ($sizes as $name => $size_config) {
            if (!elgg_extract('square', $size_config, false)) {
                continue;
            }
            
            $result[$name] = [
                'rel' => 'icon',
                'type' => 'image/jpeg',
                'sizes' => "{$size_config['w']}x{$size_config['h']}",
                'href' => $site->getIconURL(['size' => $name, 'type' => 'favicon']),
            ];
        }
        
        return $result;
    }
}