finish responsive images, revamp admin_images

[wfpl-cms.git] / cms_images_autoresize.php

diff --git a/cms_images_autoresize.php b/cms_images_autoresize.php
new file mode 100644 (file)
index 0000000..922b3cf
--- /dev/null
+++ b/cms_images_autoresize.php
@@ -0,0 +1,76 @@
+<?php
+
+define('DOCROOT', __DIR__ .'/');
+require_once(DOCROOT . 'config.php');
+require_once(DOCROOT . 'inc/wfpl/upload.php');
+
+function cms_images_autoresize_main_abort_404() {
+       http_response_code('404');
+       header('HTTP/1.0 404 File Not Found');
+       header('Content-Type: text/plain');
+       print('404: File not found');
+       exit();
+}
+
+function cms_images_autoresize_main() {
+       # figure out what file was requested
+       $out_fn = $_SERVER['REDIRECT_URL'];
+       $out_fn = preg_replace('|[?].*|', '', $out_fn); # apache 2.4.17
+       $out_fn = preg_replace('|.*/|', '', $out_fn);
+       $matches = array();
+       if (!preg_match('/^([0-9a-f]+)w([0-9]+)[.](png|jpg)$/', $out_fn, $matches)) {
+               cms_images_autoresize_main_abort_404();
+       }
+
+       $basename = $matches[1];
+       $width = (int)$matches[2];
+       $ext = $matches[3];
+       $in_fn = "$basename.$ext";
+       $in_path = DOCROOT . 'cms_images/' . $in_fn;
+       $out_path = DOCROOT . 'cms_images/' . $out_fn;
+       $lock_path = $out_path . '.lock';
+
+       if (!in_array($width, $GLOBALS['wfpl_image_widths'], true)) {
+               cms_images_autoresize_main_abort_404();
+       }
+
+       if (!file_exists($in_path)) {
+               cms_images_autoresize_main_abort_404();
+       }
+
+       @$lock = fopen($lock_path, 'x');
+       if (!$lock) {
+               # delete lock file if it's stale
+               $s = stat($lock_path);
+               if ($s && $s['mtime'] + 3 < time()) {
+                       unlink($lock_path);
+               } else {
+                       # if it's fresh, exit with temporary error
+                       header('HTTP/1.0 503 Service Unavailable');
+                       header('Content-Type: text/plain');
+                       header('Retry-After: 4');
+                       print("503 Service Unavailable (try again soon)\n");
+                       var_dump($s);
+                       var_dump(time());
+                       exit();
+               }
+       }
+
+       imagemagick_convert($in_path, $out_path,
+               '-geometry '
+               . $width
+               . 'x'
+               . ($width * 2)
+               . "'>'"
+       );
+
+       # done! kill the lock
+       fclose($lock);
+       unlink($lock_path);
+
+       if (!headers_sent()) {
+               header('Content-Type: ' . ($ext = 'jpg' ? 'image/jpeg' : 'image/png'));
+               readfile($out_path);
+       }
+}
+cms_images_autoresize_main();