login/pass: error messages below page title

[minimedit.git] / thumb / index.php

diff --git a/thumb/index.php b/thumb/index.php
index b49ca6ef47be6270f485de9509f1387a8fe6676a..9232b3332be5de1c33370705b4ea41e273b427d3 100644 (file)
--- a/thumb/index.php
+++ b/thumb/index.php
@@ -1,34 +1,116 @@
 <?php
-ob_clean();
-
-list ($height, $imgarg) = explode('/', ltrim($Args, '/'), 2);
-$width= 1000;
-$imgpath = "data/$imgarg";
+if ($Page->api) return;
+$imgpath = ltrim($Page->path, '/');
+if (!preg_match('{^[0-9x]+/}', $imgpath)) {
+       return;
+}
+list ($size, $imgpath) = explode('/', $imgpath, 2);
+$imgpath = preg_replace('{^(?=[0-9]+/)}', 'data/', $imgpath, 1);
+$ext = ''; # explicit file type request
 
-if (!file_exists($imgpath)) {
+if (preg_match('/(.*)(\.jpg)$/', $imgpath, $imgpart) and file_exists($imgpart[1])) {
+       # source file without requested thumb extension
+       list (, $imgpath, $ext) = $imgpart;
+}
+elseif (!file_exists($imgpath)) {
        http_response_code(404);
+       $imgpath = '404.png';
+       if (!file_exists($imgpath)) {
+               exit;
+       }
+}
+$target = "thumb/$size/$imgpath$ext";
+
+try {
+       mkthumb($imgpath, $size, $target);
+}
+catch (Throwable $e) {
+       http_response_code($e->getCode() ?: 500);
+       header("X-Error: ".explode("\n", $e->getMessage())[0], FALSE);
+       $target = '500.png';
+       if (file_exists($target)) {
+               header('Content-type: '.mime_content_type($target));
+               readfile($target);
+               exit;
+       }
+       trigger_error("thumbnail creation failed: ".$e->getMessage(), E_USER_WARNING);
        exit;
 }
 
-$target = preg_replace("{^data/}", "thumb/$height/", $imgpath, 1);
-if (!file_exists($target)) {
+header('Cache-Control: max-age=2628000');
+header('Content-Type: '.mime_content_type($target));
+header('Content-Length: '.filesize($target));
+readfile($target);
+exit;
+
+function mkthumb($source, $size, $target)
+{
+       if (strpos($size, 'x') !== FALSE) {
+               list ($width, $height) = explode('x', $size);
+               if (empty($height)) {
+                       $height = $width * 4;
+               }
+       }
+       else {
+               $height = $size;
+       }
+       if (empty($width)) {
+               $width = $height * 4;
+       }
+
+       if (isset($_GET['backend'])) {
+               $backend = $_GET['backend'];
+       }
+       elseif (file_exists($target)) {
+               return $target;
+       }
+       elseif (extension_loaded('gd')) {
+               $backend = 'gd';
+       }
+       else {
+               $backend = 'exec';
+       }
+       $backend = "mkthumb_$backend";
+
        @mkdir(dirname($target), 0777, TRUE);
+       $backend($source, $target, $width, $height);
+       return $target;
+}
 
+function mkthumb_gd($source, $target, $width, $height)
+{
+       $data = imagecreatefromstring(file_get_contents($source));
+       if (!$data) throw new Exception("error reading $source");
+       $orgwidth = imagesx($data);
+       $orgheight = imagesy($data);
+       $width = min($width, $orgwidth * $height / $orgheight);
+       $gd = imagecreatetruecolor($width, $height);
+       //TODO: trim
+       imagecopyresampled($gd, $data, 0, 0, 0, 0,
+                       $width, $height, $orgwidth, $orgheight);
+       imagejpeg($gd, $target, 90);
+}
+
+function mkthumb_exec($source, $target, $width, $height)
+{
+       if (!function_exists('popen')) {
+               throw new Exception("exec disallowed on this server", 501);
+       }
        $cmd = implode(' ', array_map('escapeshellarg', [
                'convert',
+               '-delete', '1--1', # static
                '-trim',
-               '-resize', "${width}x${height}",
-               '-quality', '90%',
-               $imgpath, $target
+               '-background', 'white', '-layers', 'flatten', # opaque
+               '-auto-orient', # apply exif rotation
+               '-interlace', 'plane', # progressive
+               '-strip', '-taint', # omit metadata
+               '-sampling-factor', '4:2:0', '-colorspace', 'sRGB', # half chroma
+               '-resize', "${width}x${height}>",
+               '-quality', '85%',
+               $source, "jpg:$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;