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PrivaPub/Controllers/ClientToServer/DataController.cs

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+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+using PrivaPub.ClientModels;
+using PrivaPub.ClientModels.Data;
+using PrivaPub.Services.ClientToServer.Public;
+
+namespace PrivaPub.Controllers.ClientToServer
+{
+    [ApiController,
+		Route("clientapi/data")]
+	public class DataController : ControllerBase
+	{
+		readonly IDataService DataService;
+		readonly ILogger<DataController> Logger;
+
+		public DataController(IDataService dataService,
+				ILogger<DataController> logger)
+		{
+			DataService = dataService;
+			Logger = logger;
+		}
+
+		[HttpGet, Route("/clientapi/data/ping"), AllowAnonymous]
+		public async ValueTask<IActionResult> Ping() => NoContent();
+
+		[HttpGet, Route("/clientapi/data/current-version"), AllowAnonymous]
+		public IActionResult CurrentVersion() =>
+				Ok(DataService.GetCurrentVersion());
+
+		[HttpGet, Route("/clientapi/data/languages"), AllowAnonymous]
+		public async Task<IActionResult> Languages(CancellationToken cancellationToken)
+		{
+			var result = new WebResult();
+			try
+			{
+				var languages = await DataService.GetLanguages(cancellationToken);
+				var viewLanguages = new List<ViewLanguage>();
+
+				viewLanguages.AddRange(languages.Select(l => new ViewLanguage
+				{
+					Name = l.NativeName,
+					International2Code = l.International2Code
+				}).ToArray());
+
+				return Ok(viewLanguages);
+			}
+			catch (Exception ex)
+			{
+				Logger.LogError(ex, $"{nameof(DataController)}.{nameof(Languages)}()");
+				return BadRequest(result.Invalidate(ex.Message, exception: ex));
+			}
+		}
+	}
+}