feat: добавил поддержку подписки на календарь и экспорт расписания лекций в формате .ics

backend/UniVerse.Api/Controllers/UsersController.cs

@@ -5,6 +5,7 @@ using UniVerse.Application.DTOs.Users;
 using UniVerse.Application.Interfaces;
 using UniVerse.Domain.Enums;
 using System.Security.Claims;
+using System.Text;
 
 namespace UniVerse.Api.Controllers;
 
@@ -83,6 +84,52 @@ public class UsersController : ControllerBase
     public async Task<ActionResult> MyEnrollments([FromQuery] PaginationRequest pagination) =>
         Ok(await _users.GetEnrollmentsAsync(CurrentUserId, pagination));
 
+    [HttpGet("me/enrollments/calendar-subscription")]
+    [ProducesResponseType(typeof(CalendarSubscriptionDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    public async Task<ActionResult<CalendarSubscriptionDto>> CalendarSubscription()
+    {
+        var token = await _users.GetCalendarSubscriptionTokenAsync(CurrentUserId);
+        var feedUrl = Url.Action(
+            nameof(CalendarEnrollmentsIcs),
+            null,
+            new { token },
+            Request.Scheme)
+            ?? $"{Request.Scheme}://{Request.Host}/api/v1/users/calendar/enrollments/{token}.ics";
+
+        return Ok(new CalendarSubscriptionDto(feedUrl));
+    }
+
+    [AllowAnonymous]
+    [HttpGet("calendar/enrollments/{token}.ics")]
+    [Produces("text/calendar")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<FileContentResult> CalendarEnrollmentsIcs(string token)
+    {
+        var ics = await _users.GetEnrollmentsIcsBySubscriptionTokenAsync(token);
+        return File(Encoding.UTF8.GetBytes(ics), "text/calendar; charset=utf-8", "my-lectures.ics");
+    }
+
+    [HttpGet("me/enrollments.ics")]
+    [Produces("text/calendar")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    public async Task<FileContentResult> MyEnrollmentsIcs()
+    {
+        var ics = await _users.GetMyEnrollmentsIcsAsync(CurrentUserId);
+        return File(Encoding.UTF8.GetBytes(ics), "text/calendar; charset=utf-8", "my-lectures.ics");
+    }
+
+    [HttpGet("me/enrollments/{lectureId:int}.ics")]
+    [Produces("text/calendar")]
+    [ProducesResponseType(StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<FileContentResult> EnrollmentIcs(int lectureId)
+    {
+        var ics = await _users.GetEnrollmentIcsAsync(CurrentUserId, lectureId);
+        return File(Encoding.UTF8.GetBytes(ics), "text/calendar; charset=utf-8", $"lecture-{lectureId}.ics");
+    }
+
     /// <summary>Получить отзывы текущего пользователя.</summary>
     /// <param name="pagination">Параметры пагинации.</param>
     /// <response code="200">Список отзывов (пагинированный).</response>