feat: sync httpdns sdk/platform updates without large binaries

HttpDNSSDK/sdk/flutter/new_httpdns/example/lib/net/httpdns_http_client_adapter.dart

@@ -0,0 +1,114 @@
+import 'dart:io';
+
+import 'package:dio/io.dart';
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+import 'package:http/io_client.dart';
+import 'package:TrustAPP_httpdns/TrustAPP_httpdns.dart';
+
+/* *
+ * 构建<E69E84><E5BBBA>?HTTPDNS 能力<E883BD><E58A9B>?IOHttpClientAdapter
+ *
+ * 本方案由EMAS团队设计实现，参考请注明出处<E587BA><E5A484>?
+*/
+
+IOHttpClientAdapter buildHttpdnsHttpClientAdapter() {
+  final HttpClient client = HttpClient();
+  _configureHttpClient(client);
+
+  _configureConnectionFactory(client);
+
+  final IOHttpClientAdapter adapter = IOHttpClientAdapter(
+    createHttpClient: () => client,
+  )..validateCertificate = (cert, host, port) => true;
+  return adapter;
+}
+
+HttpClient buildHttpdnsNativeHttpClient() {
+  final HttpClient client = HttpClient();
+  _configureHttpClient(client);
+  _configureConnectionFactory(client);
+  return client;
+}
+
+http.Client buildHttpdnsHttpPackageClient() {
+  final HttpClient httpClient = buildHttpdnsNativeHttpClient();
+  return IOClient(httpClient);
+}
+
+// HttpClient 基础配置
+void _configureHttpClient(HttpClient client) {
+  client.findProxy = (Uri _) => 'DIRECT';
+  client.idleTimeout = const Duration(seconds: 90);
+  client.maxConnectionsPerHost = 8;
+}
+
+// 配置基于 HTTPDNS 的连接工<E68EA5><E5B7A5>?
+void _configureConnectionFactory(HttpClient client) {
+  client
+      .connectionFactory = (Uri uri, String? proxyHost, int? proxyPort) async {
+    final String domain = uri.host;
+    final bool https = uri.scheme.toLowerCase() == 'https';
+    final int port = uri.port == 0 ? (https ? 443 : 80) : uri.port;
+
+    final List<InternetAddress> targets = await _resolveTargets(domain);
+    final Object target = targets.isNotEmpty ? targets.first : domain;
+
+    if (!https) {
+      return Socket.startConnect(target, port);
+    }
+
+    // HTTPS：先 TCP，再 TLS（SNI=域名），并保持可取消
+    bool cancelled = false;
+    final Future<ConnectionTask<Socket>> rawStart = Socket.startConnect(
+      target,
+      port,
+    );
+    final Future<Socket> upgraded = rawStart.then((task) async {
+      final Socket raw = await task.socket;
+      if (cancelled) {
+        raw.destroy();
+        throw const SocketException('Connection cancelled');
+      }
+      final SecureSocket secure = await SecureSocket.secure(raw, host: domain);
+      if (cancelled) {
+        secure.destroy();
+        throw const SocketException('Connection cancelled');
+      }
+      return secure;
+    });
+    return ConnectionTask.fromSocket(upgraded, () {
+      cancelled = true;
+      try {
+        rawStart.then((t) => t.cancel());
+      } catch (_) {}
+    });
+  };
+}
+
+// 通过 HTTPDNS 解析目标 IP 列表；IPv4 优先；失败则返回空列表（上层回退系统 DNS<4E><53>?
+Future<List<InternetAddress>> _resolveTargets(String domain) async {
+  try {
+    final res = await TrustAPPHttpdns.resolveHostSyncNonBlocking(
+      domain,
+      ipType: 'both',
+    );
+    final List<String> ipv4 =
+        (res['ipv4'] as List?)?.cast<String>() ?? const <String>[];
+    final List<String> ipv6 =
+        (res['ipv6'] as List?)?.cast<String>() ?? const <String>[];
+    final List<InternetAddress> targets = [
+      ...ipv4.map(InternetAddress.tryParse).whereType<InternetAddress>(),
+      ...ipv6.map(InternetAddress.tryParse).whereType<InternetAddress>(),
+    ];
+    if (targets.isEmpty) {
+      debugPrint('[HTTPDNS] no result for $domain, fallback to system DNS');
+    } else {
+      debugPrint('[HTTPDNS] resolved $domain -> ${targets.first.address}');
+    }
+    return targets;
+  } catch (e) {
+    debugPrint('[HTTPDNS] resolve failed: $e, fallback to system DNS');
+    return const <InternetAddress>[];
+  }
+}