thumb: optional width restriction in size parameter

Support a width prefix (+x) in addition to or instead of height only.
Maximum WxH can be specified, or falls back to 4x the other resolution:
"100" is equivalent to "400x100", and "640x" will bound to "640x160".

diff --git a/thumb/index.php b/thumb/index.php
index d662b5ffa2f26a29cd4620f294e56c11fddaff40..2a8e30303f7abf9482dca27e6f57e5cf9110aa5d 100644 (file)
--- a/thumb/index.php
+++ b/thumb/index.php
@@ -1,8 +1,7 @@
 <?php
 ob_clean();
 
-list ($height, $imgpath) = explode('/', ltrim($Args, '/'), 2);
-$width= 1000;
+list ($size, $imgpath) = explode('/', ltrim($Args, '/'), 2);
 $imgpath = preg_replace('{^(?=[0-9]+/)}', 'data/', $imgpath, 1);
 
 if (!file_exists($imgpath)) {
@@ -14,7 +13,7 @@ if (!file_exists($imgpath)) {
 }
 
 try {
-       $target = mkthumb($imgpath, $width, $height);
+       $target = mkthumb($imgpath, $size);
 }
 catch (Throwable $e) {
        http_response_code($e->getCode() ?: 500);
@@ -33,9 +32,21 @@ header('Content-type: '.mime_content_type($target));
 readfile($target);
 exit;
 
-function mkthumb($source, $width, $height)
+function mkthumb($source, $size)
 {
-       $target = "thumb/$height/$source";
+       if (strpos($size, 'x') !== FALSE) {
+               list ($width, $height) = explode('x', $size);
+               if (empty($height)) {
+                       $height = $width * 4;
+               }
+       }
+       else {
+               $height = $size;
+       }
+       if (empty($width)) {
+               $width = $height * 4;
+       }
+       $target = "thumb/$size/$source";
 
        if (isset($_GET['backend'])) {
                $backend = $_GET['backend'];