new filetag endpoint and config.php update

getFileTag.php

@@ -0,0 +1,42 @@
+<?php
+declare(strict_types=1);
+
+// getFileTag.php
+
+require_once 'config.php';
+
+// Set security and content headers
+header('Content-Type: application/json; charset=utf-8');
+header('X-Content-Type-Options: nosniff');
+header('Cache-Control: no-cache, must-revalidate');
+
+$metadataPath = META_DIR . 'createdTags.json';
+
+// Check if the metadata file exists and is readable
+if (!file_exists($metadataPath) || !is_readable($metadataPath)) {
+    error_log('Metadata file does not exist or is not readable: ' . $metadataPath);
+    http_response_code(200); // Return empty array with HTTP 200 so the client can handle it gracefully
+    echo json_encode([]);
+    exit;
+}
+
+$data = file_get_contents($metadataPath);
+if ($data === false) {
+    error_log('Failed to read metadata file: ' . $metadataPath);
+    http_response_code(500);
+    echo json_encode(["error" => "Unable to read metadata file."]);
+    exit;
+}
+
+// Decode the JSON data to check for validity
+$jsonData = json_decode($data, true);
+if (json_last_error() !== JSON_ERROR_NONE) {
+    error_log('Invalid JSON in metadata file: ' . $metadataPath . ' Error: ' . json_last_error_msg());
+    http_response_code(500);
+    echo json_encode(["error" => "Metadata file contains invalid JSON."]);
+    exit;
+}
+
+// Output the re-encoded JSON to ensure well-formed output
+echo json_encode($jsonData);
+exit;