ESMService.php

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<?php
 
namespace Elgg\Javascript;
 
use Elgg\Assets\ExternalFiles;
use Elgg\Cache\SimpleCache;
use Elgg\Config;
use Elgg\ViewsService;
 
class ESMService {
    
    protected array $imports = [];
    
    protected array $runtime_modules = [];
 
    public function __construct(
        protected ViewsService $views,
        protected SimpleCache $cache,
        protected ExternalFiles $externalFiles,
        protected Config $config
    ) {
    }
    
    public function getImportMapData(): array {
        $modules = $this->views->getESModules();
        $imports = [];
        $result = [];
        
        foreach ($modules as $name) {
            $short_name = str_replace('.mjs', '', $name);
            $imports[$short_name] = $this->cache->getUrl($name);
        }
        
        $result['imports'] = array_merge($imports, $this->runtime_modules);
        
        if (!$this->config->subresource_integrity_enabled) {
            return $result;
        }
        
        foreach ($result['imports'] as $name => $import) {
            $integrity = $this->externalFiles->getSubResourceIntegrity('js', "{$name}.mjs");
            // fallback for runtime modules
            $integrity = $integrity ?? $this->externalFiles->getSubResourceIntegrity('js', $name);
            
            if (!empty($integrity)) {
                $result['integrity'][$import] = $integrity;
            }
        }
        
        return $result;
    }
    
    public function register(string $name, string $href): void {
        $this->runtime_modules[$name] = $href;
    }
    
    public function import(string $name): void {
        $this->imports[$name] = true;
    }
    
    public function getImports(): array {
        return array_keys($this->imports);
    }
}