function xmlsitemap_output_file in XML sitemap 7.2

Same name and namespace in other branches

1. 8 xmlsitemap.module \xmlsitemap_output_file()
2. 6.2 xmlsitemap.pages.inc \xmlsitemap_output_file()

Output the contents of a file to the browser and check caching headers.

1 call to xmlsitemap_output_file()

xmlsitemap_output_chunk in ./xmlsitemap.pages.inc

Output a sitemap page.

File

./xmlsitemap.pages.inc, line 63

Page callbacks for the xmlsitemap module.

Code

function xmlsitemap_output_file($file, array $headers = array()) {
  if (!file_exists($file) || !is_readable($file)) {
    return MENU_NOT_FOUND;
  }
  $mtime = filemtime($file);
  $last_modified = gmdate(DATE_RFC1123, $mtime);
  $etag = '"' . md5($last_modified) . '"';

  // See if the client has provided the required HTTP headers.
  $if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']) : FALSE;
  $if_none_match = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : FALSE;
  if ($if_modified_since && $if_none_match && $if_none_match == $etag && $if_modified_since == $last_modified) {
    header('HTTP/1.1 304 Not Modified');

    // All 304 responses must send an etag if the 200 response for the same
    // object contained an etag.
    header('Etag: ' . $etag);
    exit;
  }
  $headers += array(
    'Content-type' => 'text/xml; charset=utf-8',
    'Last-modified' => $last_modified,
    'Etag' => $etag,
    'Expires' => gmdate(DATE_RFC1123, $mtime + variable_get('xmlsitemap_minimum_lifetime', 0)),
    'Cache-Control' => 'must-revalidate',
    'X-Robots-Tag' => 'noindex, follow',
  );

  // Transfer the file as output.
  xmlsitemap_file_transfer($file, $headers);
}