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task-tracking-system / TaskTrackingSystem.WebApi /Features /Translation /ConfiguredHttpContentTranslationService.cs
| using System.Net.Http.Headers; | |
| using System.Text.Json; | |
| using TaskTrackingSystem.Shared.Localization; | |
| namespace TaskTrackingSystem.WebApi.Features.Translation; | |
| /// <summary> | |
| /// Optional server-side provider adapter. It is inert until Translation:Endpoint is configured. | |
| /// </summary> | |
| public sealed class ConfiguredHttpContentTranslationService : IContentTranslationService | |
| { | |
| private readonly IHttpClientFactory httpClientFactory; | |
| private readonly IConfiguration configuration; | |
| private readonly ILogger<ConfiguredHttpContentTranslationService> logger; | |
| public ConfiguredHttpContentTranslationService( | |
| IHttpClientFactory httpClientFactory, | |
| IConfiguration configuration, | |
| ILogger<ConfiguredHttpContentTranslationService> logger) | |
| { | |
| this.httpClientFactory = httpClientFactory; | |
| this.configuration = configuration; | |
| this.logger = logger; | |
| } | |
| public Task<TranslationResult> TranslateAsync(string sourceText, string sourceLanguage, string targetLanguage, CancellationToken cancellationToken = default) => | |
| SendAsync(sourceText, sourceLanguage, targetLanguage, false, cancellationToken); | |
| public Task<TranslationResult> TransliterateNameAsync(string sourceName, string sourceLanguage, string targetLanguage, CancellationToken cancellationToken = default) => | |
| SendAsync(sourceName, sourceLanguage, targetLanguage, true, cancellationToken); | |
| private async Task<TranslationResult> SendAsync(string sourceText, string sourceLanguage, string targetLanguage, bool isName, CancellationToken cancellationToken) | |
| { | |
| var endpoint = configuration["Translation:Endpoint"] ?? Environment.GetEnvironmentVariable("TRANSLATION_API_URL"); | |
| if (string.IsNullOrWhiteSpace(endpoint)) return TranslationResult.NotConfigured(); | |
| try | |
| { | |
| using var request = new HttpRequestMessage(HttpMethod.Post, endpoint); | |
| var key = configuration["Translation:ApiKey"] ?? Environment.GetEnvironmentVariable("TRANSLATION_API_KEY"); | |
| if (!string.IsNullOrWhiteSpace(key)) request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", key); | |
| request.Content = JsonContent.Create(new | |
| { | |
| text = sourceText, | |
| sourceLanguage, | |
| targetLanguage, | |
| mode = isName ? "transliteration" : "translation", | |
| instruction = isName | |
| ? "Transliterate pronunciation/spelling only. Do not translate semantic meaning. Return the name only." | |
| : "Translate to natural formal Burmese or English. Preserve names unless requested, codes, IDs, dates, numbers, placeholders, URLs, and appropriate technical terms. Return translated text only." | |
| }); | |
| var client = httpClientFactory.CreateClient(); | |
| using var response = await client.SendAsync(request, cancellationToken); | |
| if (!response.IsSuccessStatusCode) | |
| { | |
| logger.LogWarning("Translation provider returned HTTP {StatusCode}.", (int)response.StatusCode); | |
| return new(false, null, $"Translation provider returned {(int)response.StatusCode}.", ProviderName(), false); | |
| } | |
| using var document = JsonDocument.Parse(await response.Content.ReadAsStringAsync(cancellationToken)); | |
| var root = document.RootElement; | |
| var text = TryGetString(root, "translatedText") ?? TryGetString(root, "translation") ?? TryGetString(root, "text"); | |
| return string.IsNullOrWhiteSpace(text) | |
| ? new(false, null, "Translation provider returned no translated text.", ProviderName(), false) | |
| : TranslationResult.Generated(text.Trim(), ProviderName()); | |
| } | |
| catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested) | |
| { | |
| throw; | |
| } | |
| catch (Exception ex) | |
| { | |
| logger.LogWarning("Translation provider request failed: {Message}", ex.Message); | |
| return new(false, null, "Translation provider request failed.", ProviderName(), false); | |
| } | |
| } | |
| private string ProviderName() => configuration["Translation:Provider"] ?? Environment.GetEnvironmentVariable("TRANSLATION_PROVIDER") ?? "configured-http"; | |
| private static string? TryGetString(JsonElement element, string name) => | |
| element.TryGetProperty(name, out var value) && value.ValueKind == JsonValueKind.String ? value.GetString() : null; | |
| } | |