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247 lines
9.1 KiB
247 lines
9.1 KiB
import 'dart:convert';
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import 'package:get/get.dart';
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import 'package:http/http.dart' as http;
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import '../../core/utils/logger.dart';
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import '../../data/models/appconfig.dart';
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import 'language_configs/azure_language_config.dart';
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import 'language_manager.dart';
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/// 微软 Azure Translator REST 翻译服务
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/// 端点：https://api.cognitive.microsofttranslator.com
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/// 文档：https://learn.microsoft.com/azure/ai-services/translator/reference/v3-0-translate
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class MicrosoftTranslationService extends GetxService {
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static const String _defaultEndpoint =
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'https://api.cognitive.microsofttranslator.com';
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static const String _apiPath = '/translate';
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static const String _apiVersion = '3.0';
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late final String _subscriptionKey;
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late final String _region;
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late final String _endpoint;
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bool _isInitialized = false;
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bool get isInitialized => _isInitialized;
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final LanguageManager _languageManager = Get.find<LanguageManager>();
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/// shortCode -> 微软 translationCode 缓存（由 getAzureTranslationLanguageSpecs 构建）
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final Map<String, String> _shortCodeToTranslationCode = {};
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@override
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Future<void> onInit() async {
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await initialize();
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super.onInit();
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}
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Future<bool> initialize() async {
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if (_isInitialized) return true;
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try {
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_subscriptionKey = AppConfig.cred('mt_azure', 'subscription_key', 'AZURE_TRANSLATION_KEY') ?? '';
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_region = AppConfig.cred('mt_azure', 'region', 'AZURE_TRANSLATION_REGION') ?? '';
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_endpoint =
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AppConfig.cred('mt_azure', 'endpoint', 'AZURE_TRANSLATION_ENDPOINT') ?? _defaultEndpoint;
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if (_subscriptionKey.isEmpty) {
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print(
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'🟢[MS-TRANS-DBG] AZURE_TRANSLATION_KEY 未配置，服务无法初始化');
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Logger.error('微软翻译服务初始化失败：AZURE_TRANSLATION_KEY 为空');
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return false;
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}
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for (final spec in getAzureTranslationLanguageSpecs()) {
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final short = spec['shortCode'];
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final code = spec['translationCode'];
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if (short != null && code != null) {
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_shortCodeToTranslationCode[short] = code;
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}
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}
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_isInitialized = true;
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print(
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'🟢[MS-TRANS-DBG] 微软翻译服务初始化成功: endpoint=$_endpoint, region=$_region, keyLen=${_subscriptionKey.length}, specCount=${_shortCodeToTranslationCode.length}');
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Logger.info('微软翻译服务初始化成功 region=$_region');
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return true;
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} catch (e) {
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print('🟢[MS-TRANS-DBG] 微软翻译服务初始化异常: $e');
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Logger.error('微软翻译服务初始化异常: $e');
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return false;
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}
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}
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/// 把 ASR 代码（如 `zh-CN`）映射为微软 Translator 语言码（如 `zh-Hans`）
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/// 找不到返回 null
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String? _toTranslationCode(String asrCode) {
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if (asrCode.isEmpty) return null;
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final short = _languageManager.getShortCodeByAsrCode(asrCode);
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if (short == null) return null;
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return _shortCodeToTranslationCode[short];
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}
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/// 文本翻译
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/// [text] 待翻译文本
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/// [sourceLanguageCode] 源语言 ASR 码（传空串则让微软自动检测）
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/// [targetLanguageCode] 目标语言 ASR 码
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Future<String?> translateText({
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required String text,
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required String sourceLanguageCode,
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required String targetLanguageCode,
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}) async {
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if (!_isInitialized) {
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print('🟢[MS-TRANS-DBG] 未初始化，返回 null');
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Logger.error('微软翻译服务未初始化');
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return null;
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}
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if (text.isEmpty) return null;
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try {
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final String? targetCode = _toTranslationCode(targetLanguageCode);
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if (targetCode == null) {
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print(
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'🟢[MS-TRANS-DBG] 目标语言码映射失败: targetAsr=$targetLanguageCode，返回 null');
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Logger.error('微软翻译失败：目标语言 $targetLanguageCode 不在映射表');
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return null;
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}
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final String? sourceCode = _toTranslationCode(sourceLanguageCode);
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final queryParams = <String, String>{
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'api-version': _apiVersion,
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'to': targetCode,
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};
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if (sourceCode != null && sourceCode.isNotEmpty) {
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queryParams['from'] = sourceCode;
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}
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final uri = Uri.parse('$_endpoint$_apiPath')
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.replace(queryParameters: queryParams);
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final body = json.encode([
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{'text': text}
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]);
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final headers = {
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'Content-Type': 'application/json',
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'Ocp-Apim-Subscription-Key': _subscriptionKey,
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'Ocp-Apim-Subscription-Region': _region,
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'X-ClientTraceId': _newTraceId(),
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};
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print(
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'🟢[MS-TRANS-DBG] 发起翻译请求: uri=$uri, from=$sourceCode, to=$targetCode, text=$text');
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final response =
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await http.post(uri, headers: headers, body: body).timeout(
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const Duration(seconds: 10),
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onTimeout: () => http.Response('{"error":"timeout"}', 408),
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);
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print(
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'🟢[MS-TRANS-DBG] 翻译响应: status=${response.statusCode}, bodyLen=${response.body.length}, body=${response.body.length > 500 ? response.body.substring(0, 500) : response.body}');
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if (response.statusCode != 200) {
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Logger.error(
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'微软翻译 HTTP 错误: status=${response.statusCode}, body=${response.body}');
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return null;
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}
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final decoded = json.decode(response.body);
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if (decoded is! List || decoded.isEmpty) {
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print('🟢[MS-TRANS-DBG] 响应非 List 或为空，解析失败');
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return null;
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}
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final first = decoded.first;
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if (first is! Map) return null;
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final translations = first['translations'];
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if (translations is! List || translations.isEmpty) return null;
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final translated = translations.first;
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if (translated is! Map) return null;
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final result = translated['text'];
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if (result is! String) return null;
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print('🟢[MS-TRANS-DBG] 翻译成功: $result');
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return result;
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} catch (e, st) {
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print('🟢[MS-TRANS-DBG] 翻译请求异常: $e\n$st');
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Logger.error('微软翻译请求异常: $e');
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return null;
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}
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}
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// ===== 语种检测（Azure Translator /detect）=====
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// 与原火山实现保持同一契约：返回 **ASR 代码**（如 zh-CN），
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// 带同文本缓存与最小请求间隔，避免自动检测场景下频繁打接口。
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DateTime? _lastDetectTime;
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String? _lastDetectTextKey;
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final Map<String, String> _detectCache = {};
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static const Duration _detectMinInterval = Duration(milliseconds: 800);
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Future<String?> detectTextLanguage({required String text}) async {
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if (!_isInitialized) {
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Logger.error('语种检测服务未初始化');
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return null;
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}
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final normalized = text.trim();
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if (normalized.isEmpty) return null;
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final textKey =
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normalized.length > 256 ? normalized.substring(0, 256) : normalized;
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// 命中缓存直接返回
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final cachedShort = _detectCache[textKey];
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if (cachedShort != null && cachedShort.isNotEmpty) {
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final cachedAsr = _languageManager.getAsrCodeByShortCode(cachedShort);
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if (cachedAsr != null && cachedAsr.isNotEmpty) return cachedAsr;
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}
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// 频率控制：同一文本在最小间隔内不重复请求
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final now = DateTime.now();
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if (_lastDetectTime != null && _lastDetectTextKey == textKey) {
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if (now.difference(_lastDetectTime!) < _detectMinInterval) {
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Logger.info('语种检测过于频繁，已短路本次请求');
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return null;
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}
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}
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_lastDetectTime = now;
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_lastDetectTextKey = textKey;
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try {
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final uri = Uri.parse('$_endpoint/detect')
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.replace(queryParameters: {'api-version': _apiVersion});
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final response = await http
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.post(uri,
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headers: {
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'Content-Type': 'application/json',
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'Ocp-Apim-Subscription-Key': _subscriptionKey,
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'Ocp-Apim-Subscription-Region': _region,
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'X-ClientTraceId': _newTraceId(),
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},
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body: json.encode([
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{'text': textKey}
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]))
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.timeout(const Duration(seconds: 10),
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onTimeout: () => http.Response('{"error":"timeout"}', 408));
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if (response.statusCode != 200) {
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Logger.error(
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'微软语种检测 HTTP 错误: status=${response.statusCode}, body=${response.body}');
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return null;
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}
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final decoded = json.decode(response.body);
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if (decoded is! List || decoded.isEmpty) return null;
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final first = decoded.first;
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if (first is! Map) return null;
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final short = first['language'];
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if (short is! String || short.isEmpty) return null;
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// Azure 返回的是短代码（en / zh-Hans / ja …），统一收敛到项目的 shortCode
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final normalizedShort = short.split('-').first.toLowerCase();
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_detectCache[textKey] = normalizedShort;
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final asr = _languageManager.getAsrCodeByShortCode(normalizedShort);
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Logger.info('微软语种检测: $short -> short=$normalizedShort, asr=$asr');
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return asr;
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} catch (e) {
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Logger.error('微软语种检测异常: $e');
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return null;
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}
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}
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String _newTraceId() {
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final now = DateTime.now().microsecondsSinceEpoch;
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return 'ms-trans-$now';
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}
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}
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