add http_get_cache

2026-01-20 23:18:39 -08:00
parent 572c0789b7
commit 811e884481
168 changed files with 37335 additions and 0 deletions
@@ -0,0 +1,56 @@
+import 'package:collection/collection.dart';
+
+// Clear-Site-Data: cache can be used to clear every stored response for a site in the browser cache, so use this with care. Note that this will not affected shared or intermediate caches.
+class CacheControl {
+  final String value;
+  CacheControl(this.value);
+
+  Iterable<(String, String?)> get parts => value.split(',').map((e) {
+        final p = e.split('=').map((e) => e.trim()).toList();
+        return (p.first, p.length > 1 ? p.last : null);
+      });
+
+  int _getSeconds(String key, [bool allowBool = false]) {
+    final part = parts.firstWhereOrNull((e) {
+      return e.$1.toLowerCase() == key.toLowerCase();
+    });
+    final val = int.tryParse(part?.$2 ?? '');
+    if (val != null) return val;
+    if (allowBool && _getBool(key)) return double.minPositive.toInt();
+    return 0;
+  }
+
+  bool _getBool(String key) {
+    return parts.any((e) => e.$1.toLowerCase() == key.toLowerCase());
+  }
+
+  (int, bool) _getMixed(String key) => (_getSeconds(key), _getBool(key));
+}
+
+class RequestCacheControl extends CacheControl {
+  RequestCacheControl(super.value);
+  int get maxAge => _getSeconds('max-age');
+  int get maxStale => _getSeconds('max-stale');
+  int get minFresh => _getSeconds('min-fresh');
+  bool get noCache => _getBool('no-cache');
+  bool get noStore => _getBool('no-store');
+  bool get noTransform => _getBool('no-transform');
+  bool get onlyIfCached => _getBool('only-of-cached');
+  (int, bool) get staleIfError => _getMixed('stale-if-error');
+}
+
+class ResponseCacheControl extends CacheControl {
+  ResponseCacheControl(super.value);
+  int get maxAge => _getSeconds('max-age');
+  int get sMaxAge => _getSeconds('s-maxage');
+  bool get noCache => _getBool('no-cache');
+  bool get noStore => _getBool('no-store');
+  bool get noTransform => _getBool('no-transform');
+  bool get mustRevalidate => _getBool('must-revalidate');
+  bool get mustUnderstand => _getBool('must-understand');
+  bool get private => _getBool('private');
+  bool get public => _getBool('public');
+  bool get immutable => _getBool('immutable');
+  (int, bool) get staleWhileRevalidate => _getMixed('stale-while-revalidate');
+  (int, bool) get staleIfError => _getMixed('stale-if-error');
+}