streams/Zotlabs/Module/Xp.php

<?php
namespace Zotlabs\Module;

use Zotlabs\Web\Controller;

class Xp extends Controller {

	function get() {
		if (argc() > 1) {
			$path = 'cache/xp/' . substr(argv(1),0,2) . '/' . substr(argv(1),2,2) . '/' . argv(1);

			if (! file_exists($path)) {
				// no longer cached for some reason, perhaps expired
				$resolution = substr(argv(1),(-2),2);
				if ($resolution && substr($resolution,0,1) === '-') {
					switch (substr($resolution,1,1)) {
						case '4':
							$path = get_default_profile_photo();
							break;
						case '5':
							$path = get_default_profile_photo(80);
							break;
						case '6':
							$path = get_default_profile_photo(48);
							break;
						default:
							break;
					}
				}
			}
							
			if (! file_exists($path)) {
				http_status_exit(404,'Not found');
			}
			
			$x = @getimagesize($path);
			if ($x) {
				header('Content-Type: ' . $x['mime']);
			}

			$cache = intval(get_config('system','photo_cache_time'));
			if (! $cache) {
				$cache = (3600 * 24); // 1 day
			}
		 	header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $cache) . ' GMT');
			// Set browser cache age as $cache.  But set timeout of 'shared caches'
			// much lower in the event that infrastructure caching is present.
			$smaxage = intval($cache/12);
			header('Cache-Control: s-maxage=' . $smaxage . '; max-age=' . $cache . ';');
	
			$infile = fopen($path,'rb');
			$outfile = fopen('php://output','wb');
			if ($infile && $outfile) {
				pipe_streams($infile,$outfile);
			}
			fclose($infile);
			fclose($outfile);
			killme();
		}

		http_status_exit(404,'Not found');
	}
}