thumb: show 404.png for missing requests

[minimedit.git] / thumb / index.php

diff --git a/thumb/index.php b/thumb/index.php
index 28f3b9e2759ee78e13682f93e625f113f8686ee8..f7c36d9d0a6d776bde1a4ff3008b2f401958e770 100644 (file)
--- a/thumb/index.php
+++ b/thumb/index.php
@@ -5,38 +5,57 @@ list ($height, $imgpath) = explode('/', ltrim($Args, '/'), 2);
 $width= 1000;
 $imgpath = preg_replace('{^(?=[0-9]+/)}', 'data/', $imgpath, 1);
 
-if (!function_exists('popen')) {
-       http_response_code(501);
-       $target = '501.png';
-       header('Content-type: '.mime_content_type($target));
-       readfile($target);
-       exit;
-}
-
 if (!file_exists($imgpath)) {
        http_response_code(404);
-       exit;
+       $imgpath = '404.png';
+       if (!file_exists($imgpath)) {
+               exit;
+       }
 }
 
 $target = "thumb/$height/$imgpath";
 if (!file_exists($target)) {
+       try {
+               mkthumb($imgpath, $target, $width, $height);
+       }
+       catch (Exception $e) {
+               http_response_code($e->getCode() ?: 500);
+               $target = '500.png';
+               if (file_exists($target)) {
+                       header("X-Error: ".$e->getMessage());
+                       header('Content-type: '.mime_content_type($target));
+                       readfile($target);
+                       exit;
+               }
+               trigger_error("thumbnail creation failed: ".$e->getMessage(), E_USER_WARNING);
+               exit;
+       }
+}
+
+header('Content-type: '.mime_content_type($target));
+readfile($target);
+exit;
+
+function mkthumb($source, $target, $width, $height)
+{
        @mkdir(dirname($target), 0777, TRUE);
+       return mkthumb_exec($source, $target, $width, $height);
+}
 
+function mkthumb_exec($source, $target, $width, $height)
+{
+       if (!function_exists('popen')) {
+               throw new Exception("exec disallowed on this server", 501);
+       }
        $cmd = implode(' ', array_map('escapeshellarg', [
                'convert',
                '-trim',
                '-resize', "${width}x${height}",
                '-quality', '90%',
-               $imgpath, $target
+               $source, $target
        ]));
        $return = shell_exec("$cmd 2>&1");
        if ($return) {
-               http_response_code(500);
-               trigger_error("thumbnail creation failed: $return", E_USER_WARNING);
-               exit;
+               throw new Exception($return);
        }
 }
-
-header('Content-type: '.mime_content_type($target));
-readfile($target);
-exit;