organic: Fix Content-Disposition

www/organic/pdf.php

@@ -176,7 +176,54 @@ if ($format === 'text') {
         echo "{\"type\":\"unknown\"}\n";
     }
 } else {
-    header('Content-Type: application/pdf');
-    $s = curl_init($url);
-    curl_exec($s);
+    $fd_spec = [
+        0 => ["pipe", "r"],  // stdin
+        1 => ["pipe", "w"],  // stdout
+        2 => ["pipe", "w"],  // stderr
+        3 => ["pipe", "w"],  // headers
+    ];
+    $process = proc_open(['curl', '-s', '-D', '/dev/fd/3', $url], $fd_spec, $pipes);
+    fclose($pipes[0]);
+
+    $headers = [];
+    $status_code = null;
+    while (($line = fgets($pipes[3])) !== false) {
+        if (trim($line) === '') break;
+        if ($status_code === null) {
+            $status_code = intval(explode(' ', $line)[1]);
+            if ($status_code !== 200)
+                break;
+            continue;
+        }
+        [$k,$v] = explode(':', $line, 2);
+        $k = strtolower(trim($k));
+        $v = trim($v);
+        $headers[$k] = $v;
+    }
+    fclose($pipes[3]);
+
+    if ($status_code === 200 && str_starts_with($headers['content-type'], "application/pdf")) {
+        header('Content-Type: application/pdf');
+        $content_length = null;
+        if (isset($headers['content-length'])) {
+            $content_length = intval($headers['content-length']);
+            header('Content-Length: ' . $headers['content-length']);
+        }
+        $parts = explode('/', $url);
+        $filename = $parts[sizeof($parts) - 1];
+        if (isset($headers['content-disposition'])) {
+            preg_match('@filename="(.*?)"@', $headers['content-disposition'], $matches);
+            $filename = $matches[1];
+        }
+        header('Content-Disposition: inline; filename="' . $filename . '"');
+        fpassthru($pipes[1]);
+    } else {
+        header('Status: 500');
+        header('Content-Length: 0');
+    }
+    fclose($pipes[1]);
+
+    $stderr = stream_get_contents($pipes[2]);
+    fclose($pipes[2]);
+    $return_value = proc_close($process);
 }