fix: 修复文件列表为空时的返回值处理并添加图像处理相关依赖

Controllers/BiliController.cs

@@ -0,0 +1,136 @@
+using MegghysAPI.Modules;
+using Microsoft.AspNetCore.Mvc;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+
+namespace MegghysAPI.Controllers
+{
+    [Route("api/bili")]
+    [ApiController]
+    public class BiliController : MControllerBase
+    {
+        [HttpGet("test-cap")]
+        public async Task<IActionResult> TestCap([FromQuery] string gt, [FromQuery] string challenge)
+        {
+            var solution = await CapResolver.SolveGeetestAsync("https://www.bilibili.com", gt, challenge);
+            return Ok(ResponseOK(solution));
+        }
+
+        [HttpGet("resolve-grisk-id")]
+        public async Task<IActionResult> ResolveGriskId([FromQuery] string v_voucher, [FromQuery] string? csrf)
+        {
+            if (string.IsNullOrEmpty(v_voucher))
+            {
+                return BadRequest(ResponseBadRequest("v_voucher 不能为空"));
+            }
+
+            try
+            {
+                // 1. 调用B站注册接口获取 gt, challenge, token
+                var (gt, challenge, token) = await RegisterFromVVoucher(v_voucher, csrf);
+
+                // 2. 使用 CapResolver 解决验证码, 获取 validate
+                var solution = await CapResolver.SolveGeetestAsync("https://live.bilibili.com", gt, challenge);
+                if (solution == null)
+                {
+                    throw new Exception("从 CapSolver 获取 validate 失败");
+                }
+                string validate = solution.Validate;
+
+                // 3. 调用B站验证接口获取 grisk_id
+                var griskId = await ValidateToGriskId(challenge, token, validate, csrf);
+
+                return Ok(ResponseOK(new { grisk_id = griskId }));
+            }
+            catch (Exception ex)
+            {
+                Logs.Error($"ResolveGriskId 失败: {ex.Message}");
+                return StatusCode(500, ResponseInternalError(ex.Message));
+            }
+        }
+        public const string FirstHost = "https://i.ukamnads.icu/api-bilibili/";
+        public const string SecondHost = "https://api.bilibili.com/";
+        private static readonly string[] PreferredHosts = { FirstHost, SecondHost };
+
+        private async Task<(string gt, string challenge, string token)> RegisterFromVVoucher(string vVoucher, string? csrf)
+        {
+            var path = "x/gaia-vgate/v1/register";
+            var payload = new Dictionary<string, string> { { "v_voucher", vVoucher } };
+            if (!string.IsNullOrEmpty(csrf))
+            {
+                payload["csrf"] = csrf;
+            }
+
+            var root = await PostFormWithFailoverAsync(path, payload, "注册接口");
+            var data = root["data"] ?? throw new Exception("注册接口返回缺少 data 字段");
+
+            var geetest = data["geetest"] ?? throw new Exception("注册返回缺少 geetest 字段");
+            var gt = (string?)geetest["gt"] ?? throw new Exception("注册返回缺少 gt 字段");
+            var challenge = (string?)geetest["challenge"] ?? throw new Exception("注册返回缺少 challenge 字段");
+            var apiToken = (string?)data["token"] ?? throw new Exception("注册返回缺少 token 字段");
+
+            return (gt, challenge, apiToken);
+        }
+
+        private async Task<string> ValidateToGriskId(string challenge, string token, string validate, string? csrf)
+        {
+            var path = "x/gaia-vgate/v1/validate";
+            var seccode = $"{validate}|jordan";
+            var payload = new Dictionary<string, string>
+            {
+                { "challenge", challenge },
+                { "token", token },
+                { "validate", validate },
+                { "seccode", seccode },
+            };
+            if (!string.IsNullOrEmpty(csrf))
+            {
+                payload["csrf"] = csrf;
+            }
+
+            var root = await PostFormWithFailoverAsync(path, payload, "验证接口");
+            var data = root["data"] ?? throw new Exception("验证接口返回缺少 data 字段");
+
+            var isValid = (int?)data["is_valid"];
+            var griskId = (string?)data["grisk_id"];
+
+            if (isValid != 1 || string.IsNullOrEmpty(griskId))
+            {
+                throw new Exception($"验证失败或缺少 grisk_id: is_valid={isValid} grisk_id={griskId}");
+            }
+
+            return griskId;
+        }
+
+        private async Task<JsonNode> PostFormWithFailoverAsync(string path, Dictionary<string, string> payload, string operation)
+        {
+            Exception? lastException = null;
+            foreach (var host in PreferredHosts)
+            {
+                try
+                {
+                    using var content = new FormUrlEncodedContent(payload);
+                    var response = await Utils._client.PostAsync($"{host}{path}", content);
+                    response.EnsureSuccessStatusCode();
+
+                    var json = await response.Content.ReadAsStringAsync();
+                    return JsonNode.Parse(json) ?? throw new Exception($"{operation} 返回内容解析失败");
+                }
+                catch (Exception ex)
+                {
+                    lastException = ex;
+                    if (host == FirstHost)
+                    {
+                        Logs.Warn($"{operation} 使用 FirstHost 调用失败: {ex.Message}");
+                    }
+                    else
+                    {
+                        Logs.Error($"{operation} 使用 SecondHost 调用失败: {ex.Message}");
+                    }
+                }
+            }
+
+            throw new Exception($"{operation} 调用失败: {lastException?.Message}", lastException);
+        }
+    }
+}