DownloadResponse.php

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<?php

namespace Elgg\Http;

class DownloadResponse extends OkResponse {
    
    public function getHeaders() {
        $headers = parent::getHeaders();
        
        if (!isset($headers['Content-Type'])) {
            $headers['Content-Type'] = 'application/octet-stream; charset=utf-8';
        }
        
        if (!isset($headers['Cache-Control'])) {
            $headers['Cache-Control'] = 'no-store';
        }
        
        if (!isset($headers['Content-Disposition'])) {
            $headers['Content-Disposition'] = 'attachment';
        }
        
        if (!empty($this->content) && !isset($headers['Content-Length'])) {
            $headers['Content-Length'] = strlen((string) $this->content);
        }
        
        return $headers;
    }
    
    public function setForwardURL(string $forward_url = REFERRER) {
        return $this;
    }
    
    public function setFilename(string $filename = '', bool $inline = false): static {
        if (isset($this->headers['Content-Disposition'])) {
            return $this;
        }
        
        $disposition = $inline ? 'inline' : 'attachment';
        
        if (!elgg_is_empty($filename)) {
            $disposition .= "; filename=\"{$filename}\"";
        }
        
        $this->headers['Content-Disposition'] = $disposition;
        
        return $this;
    }
}