BabyVideoService/VideoDownload/Platforms/DouYin.cs

using System.ComponentModel;
using System.Text.RegularExpressions;
using Downloader;
using Newtonsoft.Json;
using RestSharp;

namespace ACBuildService;

public class DouYin : DownloadPlatforms
{
    private static readonly Dictionary<string, string> _defaultHeaders = new()
    {
        {
            "User-Agent",
            "Mozilla/5.0 (Linux; Android 8.0.0; SM-G955U Build/R16NW) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Mobile Safari/537.36"
        },
        { "sec-fetch-site", "same-origin" },
        { "sec-fetch-mode", "cors" },
        { "sec-fetch-dest", "empty" },
        { "sec-ch-ua-platform", "Windows" },
        { "sec-ch-ua-mobile", "?0" },
        { "sec-ch-ua", "\"Not/A)Brand\";v=\"8\", \"Chromium\";v=\"126\", \"Google Chrome\";v=\"126\"" },
        { "referer", "https://www.douyin.com/?recommend=1" },
        { "priority", "u=1, i" },
        { "pragma", "no-cache" },
        { "cache-control", "no-cache" },
        { "accept-language", "zh-CN,zh;q=0.9,en;q=0.8" },
        {
            "accept",
            "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7"
        },
        { "dnt", "1" }
    };

    public async override Task<string> ExtractUrlAsync(string text)
    {
        Log.Info($"开始解析抖音链接 {text}");
        return Regex.Match(text, @"https?://[^\s]+").Value;
    }

    public override async Task<VideoModel> ParseShare(string DownloadUrlText)
    {
        if (!DownloadUrlText.Contains("https://"))
        {
            Log.Error("请输入正确的分享链接");
            return null;
        }

        var downloadUrl = await ExtractUrlAsync(DownloadUrlText);
        VideoModel Data = await ExtractVideoDataAsync(downloadUrl);
        Data.ShareId = downloadUrl.Replace("https://v.douyin.com/", "").Replace("/", "");

        return Data;
    }

    /// <summary>
    ///     根据链接 https://v.douyin.com/ircqoExo/ 解析出页面中的数据
    /// </summary>
    /// <param name="url"></param>
    /// <returns></returns>
    public override Task<VideoModel> ExtractVideoDataAsync(string url)
    {
        try
        {
            Log.Info($"开始解析链接 {url}");
            // 创建RestClient
            RestClient client = new(url);

            // 创建请求对象
            RestRequest request = new();

            // 设置 User-Agent 模拟手机浏览器
            request.AddHeaders(_defaultHeaders);

            // 发送请求并获取响应
            var response = client.Execute(request);
            if (!response.IsSuccessful) throw new HttpRequestException("request is fail");

            var content = response.Content;
            Log.Info($"开始解析响应内容 {content}");
            if (content is null) throw new InvalidDataException("content is null");

            const string routerDataPattern = @"_ROUTER_DATA\s*=\s*(\{.*?\})<";

            var matchJson = Regex.Match(content, routerDataPattern);

            Log.Info($"开始解析匹配到的json {matchJson}");
            if (matchJson.Groups.Count < 2) throw new InvalidDataException("未匹配到合法的数据，matchJson.Groups.Count < 2");

            var videoJson = matchJson.Groups[1].Value;
            Log.Info($"开始解析匹配到的json {videoJson}");
            // 反序列化JSON字符串为C#对象
            var videoData = JsonConvert.DeserializeObject<DouYinShareRouterData>(videoJson);

            if (videoData is null) throw new InvalidDataException("JSON解析数据为空，请检查分享链接是否正确，如有更多问题请查看日志");

            var videoInfoData = videoData.LoaderData.VideoIdPage.VideoInfoRes.ItemList.First();

            var video = new VideoModel
            {
                Platform = ShortVideoPlatformEnum.DouYin,
                VideoId = videoInfoData.AwemeId,
                AuthorName = videoInfoData.Author.Nickname,
                UniqueId = videoInfoData.Author.UniqueId == ""
                    ? videoInfoData.Author.ShortId
                    : videoInfoData.Author.UniqueId,
                AuthorAvatar = videoInfoData.Author.AvatarThumb.UrlList.First().ToString(),
                Title = videoInfoData.Author.Signature,
                Cover = videoInfoData.Video.Cover.UrlList.Last().ToString(),
                Mp3Url = "",
                CreatedTime =
                    DateTimeOffset.FromUnixTimeSeconds(videoInfoData.CreateTime)
                        .ToString("yyyy-MM-dd HH:mm:ss"),
                Desc = videoInfoData.Desc,
                Duration = "",
                DiggCount = videoInfoData.Statistics.DiggCount,
                CollectCount = videoInfoData.Statistics.CollectCount,
                CommentCount = videoInfoData.Statistics.CommentCount,
                ShareCount = videoInfoData.Statistics.ShareCount
            };
            switch (videoInfoData.AwemeType)
            {
                case 2:
                    video.VideoUrl = videoInfoData.Video.Cover.UrlList.First().ToString();
                    break;
                default:
                    video.VideoUrl = videoInfoData.Video.PlayAddr.UrlList.First().ToString().Replace("playwm", "play");
                    break;
            }

            if (video.VideoUrl.Contains("ratio=720p"))
            {
                video.VideoUrl = video.VideoUrl.Replace("ratio=720p", "ratio=1080p");
            }

            return Task.FromResult(video);
        }
        catch (Exception e)
        {
            Log.Error(e.Message);
            throw;
        }
    }

    public override async Task<bool> DownloadAsync(string url, string savePath, string fileName,
        EventHandler<DownloadProgressChangedEventArgs> onProgressChanged,
        EventHandler<AsyncCompletedEventArgs> onProgressCompleted)
    {
        DownloadConfiguration downloadConfiguration = new()
        {
            ChunkCount = 8, // Download in 8 chunks (increase for larger files)
            MaxTryAgainOnFailure = 5,
            Timeout = 10000, // 10 seconds timeout for each request
            RequestConfiguration = new RequestConfiguration
            {
                UserAgent = _defaultHeaders.GetValueOrDefault("User-Agent")
            }
        };

        DownloadService downloader = new(downloadConfiguration);

        downloader.DownloadProgressChanged += onProgressChanged;
        downloader.DownloadFileCompleted += onProgressCompleted;

        try
        {
            await downloader.DownloadFileTaskAsync(url, Path.Combine(savePath, fileName));
            return true;
        }
        catch (Exception ex)
        {
            Log.Info($"Download failed: {ex}");
        }

        return false;
    }
}