Extracted spaces to extra directory

datasets/datasets.php

 <?php
 
-$EMPTY_SPACE_FILE = kg_get_space_file_path("default").".hidden";
+$EMPTY_SPACE_FILE = __DIR__."/empty-space.json";
+$SPACES_DIR = __DIR__."/spaces/";
 
 add_action("wp_ajax_get_space", "kg_get_space"); // Fires only for logged-in-users
 add_action("wp_ajax_nopriv_get_space", 'kg_get_space' ); // Fires for everyone
@@ -56,11 +57,18 @@ function kg_store_new_graph($graph, $space_id) {
 }
 
 function kg_get_space_file_path($space_id) {
-    return __DIR__."/".$space_id.".json";
+    // Cleaning up the space id
+    $space_id = str_replace("/", "-", $space_id);
+    $space_id = str_replace("\\", "-", $space_id);
+    $space_id = str_replace(".", "-", $space_id);
+
+    global $SPACES_DIR;
+    return $SPACES_DIR.$space_id.".json";
 }
 
 function kg_get_list_of_spaces() {
-    $all_files = scandir(__DIR__);
+    global $SPACES_DIR;
+    $all_files = scandir($SPACES_DIR);
 
     if ($all_files == false) {
         return [];

datasets/spaces/crazy.json

+{"links":[{"source":"tNp3gydg","target":"flL8y4fI"},{"source":"flL8y4fI","target":"HL2mJfY7"},{"source":"HL2mJfY7","target":"c2kVhY7g"},{"source":"c2kVhY7g","target":"flL8y4fI"},{"source":"flL8y4fI","target":"6PDvcacV"}],"nodes":[{"id":"flL8y4fI","name":"Musik","type":"Beispiel"},{"id":"6PDvcacV","name":"Comics","type":"Beispiel"},{"id":"HL2mJfY7","name":"Peter Fox","type":"Beispiel"},{"id":"c2kVhY7g","name":"Haus Am See","type":"Vorlesung"},{"id":"tNp3gydg","name":"Filme","type":"Übung"}]}
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