DanMuRead/BarrageGrab/Utility/KsApiHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using BarrageGrab.Modles;
using Newtonsoft.Json.Linq;

namespace BarrageGrab
{
    internal class KsApiHelper
    {
        public static async Task<KsRoomInfo> GetRoomInfo(string userId, string cookie = null)
        {
            string url = $"https://live.kuaishou.com/u/{userId}";

            var client = new HttpClient();
            client.DefaultRequestHeaders.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0");
            client.DefaultRequestHeaders.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
            client.DefaultRequestHeaders.Add("Accept-Language", "zh-CN,zh;q=0.9");
            if (!string.IsNullOrWhiteSpace(cookie))
            {
                client.DefaultRequestHeaders.Add("Cookie", cookie);
            }

            try
            {
                var response = await client.GetStringAsync(url);
                return ParseRoomInfoFromHtml(response, userId);
            }
            catch (Exception ex)
            {
                Logger.LogError($"获取快手房间信息失败: {ex.Message}");
                return null;
            }
        }

        public static KsRoomInfo ParseRoomInfoFromHtml(string html, string userId)
        {
            var info = new KsRoomInfo { UserId = userId };

            try
            {
                // 2026-05 快手页面结构变更: __INITIAL_STATE__ JSON 中的字段名和旧版本不同
                // liveStreamId → 嵌套在 "liveStream":{"id":"xxx"}
                var liveStreamIdReg = new Regex(@"""liveStream""\s*:\s*\{[^}]*?""id""\s*:\s*""([^""]+)""");
                var liveStreamMatch = liveStreamIdReg.Match(html);
                if (liveStreamMatch.Success)
                {
                    info.LiveStreamId = liveStreamMatch.Groups[1].Value;
                }

                // 直播封面 → liveStream.poster
                var posterReg = new Regex(@"""liveStream""\s*:\s*\{[^}]*?""poster""\s*:\s*""([^""]+)""");
                var posterMatch = posterReg.Match(html);
                if (posterMatch.Success)
                {
                    info.CoverUrl = UnescapeJson(posterMatch.Groups[1].Value);
                }

                // token
                var tokenReg = new Regex(@"""token""\s*:\s*""([^""]*)""");
                var tokenMatch = tokenReg.Match(html);
                if (tokenMatch.Success && !string.IsNullOrWhiteSpace(tokenMatch.Groups[1].Value))
                {
                    info.Token = tokenMatch.Groups[1].Value;
                }

                // 主播昵称 → 嵌套在 "author":{"...","name":"xxx"}
                var nickReg = new Regex(@"""author""\s*:\s*\{[^}]*?""name""\s*:\s*""([^""]+)""");
                var nickMatch = nickReg.Match(html);
                if (nickMatch.Success)
                {
                    info.Nickname = nickMatch.Groups[1].Value;
                }

                // 主播头像 → author.avatar
                var avatarReg = new Regex(@"""author""\s*:\s*\{[^}]*?""avatar""\s*:\s*""([^""]+)""");
                var avatarMatch = avatarReg.Match(html);
                if (avatarMatch.Success)
                {
                    info.HeadUrl = UnescapeJson(avatarMatch.Groups[1].Value);
                }

                // 观看人数 → 现在是字符串如 "1万+"，不是纯数字
                var watchingReg = new Regex(@"""watchingCount""\s*:\s*""([^""]+)""");
                var watchingMatch = watchingReg.Match(html);
                if (watchingMatch.Success)
                {
                    info.WatchingCountStr = watchingMatch.Groups[1].Value;
                    info.WatchingCount = ParseCount(info.WatchingCountStr);
                }

                // 点赞数 → 字段名已变更为 liked
                var likeReg = new Regex(@"""liked""\s*:\s*""([^""]+)""");
                var likeMatch = likeReg.Match(html);
                if (likeMatch.Success)
                {
                    info.LikeCountStr = likeMatch.Groups[1].Value;
                    info.LikeCount = ParseCount(info.LikeCountStr);
                }

                // 直播状态 → 现在是 isLiving 布尔值
                var liveReg = new Regex(@"""isLiving""\s*:\s*(true|false)");
                var liveMatch = liveReg.Match(html);
                if (liveMatch.Success)
                {
                    info.IsLive = liveMatch.Groups[1].Value == "true";
                }
            }
            catch (Exception ex)
            {
                Logger.LogWarn($"解析快手页面房间信息时出错: {ex.Message}");
            }

            return info;
        }

        // 将 "1万+" "2853" "6.7w" 等转为 long
        private static long ParseCount(string str)
        {
            if (string.IsNullOrWhiteSpace(str)) return 0;
            str = str.Trim();
            // 含"万" → 乘以10000
            if (str.Contains("万"))
            {
                var numStr = Regex.Replace(str, @"[^\d\.]", "");
                if (double.TryParse(numStr, out var d)) return (long)(d * 10000);
            }
            // 含"w" → 乘以10000
            if (str.ToLower().Contains("w"))
            {
                var numStr = Regex.Replace(str, @"[^\d\.]", "");
                if (double.TryParse(numStr, out var d)) return (long)(d * 10000);
            }
            // 纯数字
            if (long.TryParse(str, out var l)) return l;
            return 0;
        }

        // 反转义 JSON Unicode 转义序列 (\\u002F → /)
        private static string UnescapeJson(string str)
        {
            if (string.IsNullOrWhiteSpace(str)) return str;
            return Regex.Replace(str, @"\\u([0-9a-fA-F]{4})", m =>
            {
                int code = int.Parse(m.Groups[1].Value, System.Globalization.NumberStyles.HexNumber);
                return ((char)code).ToString();
            });
        }
    }

    public class KsRoomInfo
    {
        public string UserId { get; set; }
        public string LiveStreamId { get; set; }
        public string Token { get; set; }
        public string Nickname { get; set; }
        public long WatchingCount { get; set; }
        public long LikeCount { get; set; }
        public bool IsLive { get; set; }
        public string PageId { get; set; } = Guid.NewGuid().ToString("N").Substring(0, 16);
        public string LiveUrl { get; set; }
        // 字符串格式的原始值（用于展示 "1万+" 等）
        public string WatchingCountStr { get; set; }
        public string LikeCountStr { get; set; }
        // 头像和封面
        public string HeadUrl { get; set; }
        public string CoverUrl { get; set; }
    }
}