Add several ways to handle thumbnails. re #5

book.php

@@ -632,6 +632,11 @@ function getJson ($complete = false) {
                        "use_fancyapps" => $config ["cops_use_fancyapps"],
                        "max_item_per_page" => $config['cops_max_item_per_page'],
                        "html_tag_filter" => $config['cops_html_tag_filter']));
+        if ($config['cops_thumbnail_handling'] == "1") {
+            $out ["const"]["url"]["thumbnailUrl"] = $out ["const"]["url"]["coverUrl"];
+        } else if (!empty ($config['cops_thumbnail_handling'])) {
+            $out ["const"]["url"]["thumbnailUrl"] = $config['cops_thumbnail_handling'];
+        }
    }
 
     $out ["containsBook"] = 0;

config_default.php

@@ -202,9 +202,9 @@
      * This configuration item allow to customize how thumbnail will be generated
      * "" : Generate thumbnail (CPU hungry)
      * "1" : always send the full size image (Network hungry)
-     * any url : Send a constant image as the thumbnail (you can try "images/bookcover.svg")
+     * any url : Send a constant image as the thumbnail (you can try "images/bookcover.png")
      */
-    $config['cops_thumbnail_handling'] = "images/bookcover.svg";
+    $config['cops_thumbnail_handling'] = "";
     
     /*
      * Contains a list of user agent for browsers not compatible with client side rendering

data.php

@@ -131,12 +131,20 @@ class Data extends Base {
                         $height = $config['cops_html_thumbnail_height'];
                     }
                 }
+                if ($config['cops_thumbnail_handling'] != "1") {
                     $urlParam = addURLParameter($urlParam, "height", $height);
                 }
+            }
             $urlParam = addURLParameter($urlParam, "id", $book->id);
             if (!is_null (GetUrlParam (DB))) $urlParam = addURLParameter ($urlParam, DB, GetUrlParam (DB));
+            if ($config['cops_thumbnail_handling'] != "1" && 
+                !empty ($config['cops_thumbnail_handling']) && 
+                $rel == Link::OPDS_THUMBNAIL_TYPE) {
+                return new Link ($config['cops_thumbnail_handling'], $mime, $rel, $title);
+            } else {
                 return new Link ("fetch.php?" . $urlParam, $mime, $rel, $title);
             }
+        }
         else
         {
             return new Link (str_replace('%2F','/',rawurlencode ($book->path."/".$filename)), $mime, $rel, $title);