course/backend/src/UoocProgress.Api/Controllers/PlatformChallengesController.cs

using System.Security.Claims;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using UoocProgress.Api.Models;
using UoocProgress.Api.Services;

namespace UoocProgress.Api.Controllers;

[ApiController]
[Authorize(Policy = "UserOrAdmin")]
[Route("api/platform-challenges")]
public sealed class PlatformChallengesController(ChallengeSessionService challengeSessionService) : ControllerBase
{
    [HttpGet("{challengeSessionId}")]
    [ProducesResponseType<ChallengeSessionDto>(StatusCodes.Status200OK)]
    [ProducesResponseType<ProblemDetails>(StatusCodes.Status404NotFound)]
    public ActionResult<ChallengeSessionDto> GetChallenge(string challengeSessionId)
    {
        var claimValue = User.FindFirstValue(ClaimTypes.NameIdentifier);
        var userId = long.TryParse(claimValue, out var parsed)
            ? parsed
            : throw new InvalidOperationException("当前登录态无效。");

        var challenge = challengeSessionService.Get(challengeSessionId, userId);
        if (challenge is null)
        {
            return NotFound(new ProblemDetails
            {
                Title = "挑战会话不存在",
                Detail = "未找到对应的挑战会话。",
                Status = StatusCodes.Status404NotFound
            });
        }

        return Ok(challenge);
    }
}