Disable legacy HTTP image hooks by default

hook/git_pull.php

@@ -1,6 +1,16 @@
 <?php
 namespace sammo\img_service;
 
+if (php_sapi_name() !== 'cli' && !file_exists(__DIR__.'/legacy-enabled')) {
+    header('Content-Type: application/json');
+    http_response_code(410);
+    die(json_encode([
+        'result'=>false,
+        'reason'=>'legacy pull disabled',
+        'version'=>null,
+    ]));
+}
+
 include(__DIR__.'/HashKey.php');
 
 function hashPassword($salt, $password)
@@ -106,4 +116,4 @@ file_put_contents('list.json', json_encode($img_list));
 $json_response['result'] = true;
 $json_response['reason'] = 'success';
 $json_response['version'] = getVersion();
-die(json_encode($json_response));
+die(json_encode($json_response));