768 lines
28 KiB
C#
768 lines
28 KiB
C#
using System.Text.Json;
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using System.Text.Json.Nodes;
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using Microsoft.Web.WebView2.Core;
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namespace WinFormsApp3
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{
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/// <summary>
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/// 当前正在播放的视频地址。
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/// </summary>
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/// <param name="Url">可直接 HTTP 访问的视频地址；PlaylistText 不为空时作为相对地址基准。</param>
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/// <param name="PlaylistText">只在内存里拿到 m3u8 文本时使用（抖音这类 MSE 播放）。</param>
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/// <param name="Referer">发出这个请求的文档地址；跨域 iframe 播放器必须用它，不然会被防盗链拒掉。</param>
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public record VideoCandidate(string Url, string? PlaylistText = null, string? Referer = null);
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public partial class Form1 : Form
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{
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private const string SnifferScript = @"Resources\media_sniffer.js";
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private const string ButtonScript = @"Resources\video_button.js";
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private const string GrabScript = @"Resources\video_grab.js";
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private double currentZoomFactor = 1.3;
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private readonly List<string> sniffedUrls = new();
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private readonly List<string> sniffedPlaylists = new();
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/// <summary>视频地址 → 发出请求的文档地址，用作下载时的 Referer。</summary>
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private readonly Dictionary<string, string> urlReferers = new();
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private readonly Dictionary<string, string> injectedScripts = new();
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private CancellationTokenSource? downloadCts;
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private bool hooksAttached;
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public Form1()
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{
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InitializeComponent();
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string css = @"
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.pt-top-nav { display: none !important; }
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.pt-head-bg { display: none !important; }
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.pt-navbg { display: none !important; }
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.erwm { display: none !important; }
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.pt-right { display: none !important; }
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.pt-copyright { display: none !important; }
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.pt-crumb { display: none !important; }
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.txtinfo { display: none !important; }
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.mys-wrapper { display: none !important; }
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.tools { display: none !important; }
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.headbox { display: none !important; }
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.setbox { display: none !important; }
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.foot { display: none !important; }
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";
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if (File.Exists("css.txt"))
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{
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css = File.ReadAllText("css.txt");
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}
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webView21.NavigationCompleted += async (sender, e) =>
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{
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if (e.IsSuccess)
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{
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await InjectCssAsync(css);
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}
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};
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urlTxt.Text = "http://www.luoqiuzww.cc";
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}
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private async Task InjectCssAsync(string css)
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{
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if (File.Exists("css.txt"))
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{
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css = File.ReadAllText("css.txt");
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}
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string script = $@"
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var style = document.createElement('style');
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style.type = 'text/css';
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style.innerHTML = `{css}`;
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document.head.appendChild(style);
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";
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await webView21.CoreWebView2.ExecuteScriptAsync(script);
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}
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private void OnNavigationCompleted(object sender, CoreWebView2NavigationCompletedEventArgs e)
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{
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if (e.IsSuccess)
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{
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urlTxt.Text = ((Microsoft.Web.WebView2.Core.CoreWebView2)sender).Source;
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// 小延迟确保DOM完全加载
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Task.Delay(100).ContinueWith(_ =>
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{
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this.Invoke((MethodInvoker)delegate
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{
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if (Math.Abs(webView21.ZoomFactor - currentZoomFactor) > 0.01f)
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{
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webView21.ZoomFactor = currentZoomFactor;
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}
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});
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});
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}
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}
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/// <summary>
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/// 顶层页面导航完成后重置嗅探结果：只保留当前页面里播过的地址，
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/// 免得长时间浏览后下载地址越攒越多。
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/// </summary>
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private void OnMainNavigationCompleted(object? sender, CoreWebView2NavigationCompletedEventArgs e)
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{
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if (!e.IsSuccess)
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{
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return;
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}
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lock (sniffedUrls) sniffedUrls.Clear();
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lock (urlReferers) urlReferers.Clear();
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sniffedPlaylists.Clear();
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}
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private async Task EnsureCoreAsync()
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{
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if (webView21.CoreWebView2 != null)
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{
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return;
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}
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try
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{
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// 初始化 CoreWebView2
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await webView21.EnsureCoreWebView2Async(null);
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if (!hooksAttached && webView21.CoreWebView2 is { } core)
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{
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hooksAttached = true;
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core.FrameNavigationCompleted += OnNavigationCompleted;
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core.NavigationCompleted += OnNavigationCompleted;
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// 换了页面就把上一页嗅探到的地址清空，下载时只会拿到当前这页在播的视频
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core.NavigationCompleted += OnMainNavigationCompleted;
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core.DOMContentLoaded += (sender, e) => webView21.ZoomFactor = currentZoomFactor;
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webView21.ZoomFactorChanged += (sender, e) => currentZoomFactor = webView21.ZoomFactor;
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// 页面里的嗅探脚本靠这两个事件把视频地址回传
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core.WebMessageReceived += OnWebMessageReceived;
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// 站点自带的"下载"按钮（如抖音）也统一走另存为，避免存到看不见的默认目录
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core.DownloadStarting += OnDownloadStarting;
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// 新窗口就地导航，保证嗅探脚本仍然在跑
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core.NewWindowRequested += OnNewWindowRequested;
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}
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await InjectScriptsAsync();
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}
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catch (Exception ex)
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{
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MessageBox.Show($"初始化 WebView2 失败: {ex.Message}");
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}
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}
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/// <summary>
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/// 在文档创建阶段注入嗅探与悬浮按钮脚本，保证早于播放器脚本运行（抖音视频是翻页加载的，尤其需要早注入）。
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/// </summary>
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private async Task InjectScriptsAsync()
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{
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var core = webView21.CoreWebView2;
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if (core == null)
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{
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return;
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}
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foreach (var file in new[] { SnifferScript, ButtonScript })
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{
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if (injectedScripts.ContainsKey(file))
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{
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continue;
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}
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string code = ReadScript(file);
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if (string.IsNullOrEmpty(code))
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{
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continue;
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}
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string id = await core.AddScriptToExecuteOnDocumentCreatedAsync(code);
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if (!string.IsNullOrEmpty(id))
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{
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injectedScripts[file] = id;
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}
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}
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}
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private async void InitializeWebView()
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{
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await EnsureCoreAsync();
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if (webView21.CoreWebView2 == null)
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{
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return;
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}
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try
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{
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// 加载网页
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webView21.CoreWebView2.Navigate(urlTxt.Text);
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}
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catch (Exception ex)
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{
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MessageBox.Show($"加载页面失败: {ex.Message}");
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}
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}
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private void Form1_Load(object sender, EventArgs e)
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{
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if (File.Exists("currentLink.txt"))
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{
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urlTxt.Text = File.ReadAllText("currentLink.txt");
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}
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// 打开就直接加载页面，不用先点一次“转到”才能看视频
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InitializeWebView();
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}
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private void Form1_FormClosing(object sender, FormClosingEventArgs e)
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{
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File.WriteAllText("currentLink.txt", urlTxt.Text);
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}
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private void cssBut_Click(object sender, EventArgs e)
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{
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ShowDialog("css.txt");
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}
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private void addLinkBut_Click(object sender, EventArgs e)
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{
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File.AppendAllText("link.txt", "\r\n" + urlTxt.Text);
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}
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private void linkBut_Click(object sender, EventArgs e)
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{
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ShowDialog("link.txt");
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}
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private void ShowDialog(string path)
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{
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Form2 form2 = new Form2();
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form2.Path = path;
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form2.ShowDialog();
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}
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private void displayBut_Click(object sender, EventArgs e)
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{
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urlTxt.Visible = !urlTxt.Visible;
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}
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private void goBut_Click(object sender, EventArgs e)
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{
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InitializeWebView();
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}
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#region 视频下载
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private static string ReadScript(string file)
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{
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try
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{
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string path = Path.IsPathRooted(file) ? file : Path.Combine(Application.StartupPath, file);
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return File.Exists(path) ? File.ReadAllText(path) : string.Empty;
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}
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catch
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{
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return string.Empty;
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}
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}
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private void SetStatus(string text)
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{
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if (IsHandleCreated && InvokeRequired)
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{
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BeginInvoke(new Action(() => statusLbl.Text = text));
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}
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else
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{
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statusLbl.Text = text;
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}
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}
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/// <summary>
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/// 嗅探到的地址可能来自不同 iframe，列表要加锁并限制长度，
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/// 只留最近若干个，供“当前播放地址取不到时”兜底用。
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/// </summary>
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private void AddSniffedUrl(string url, string? referer)
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{
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lock (sniffedUrls)
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{
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if (!sniffedUrls.Contains(url))
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{
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sniffedUrls.Add(url);
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}
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while (sniffedUrls.Count > 50) sniffedUrls.RemoveAt(0);
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}
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if (!string.IsNullOrWhiteSpace(referer))
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{
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lock (urlReferers) urlReferers[url] = referer;
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}
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}
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private string? RefererFor(string url, string? fallback)
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{
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lock (urlReferers)
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{
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if (urlReferers.TryGetValue(url, out var referer)) return referer;
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}
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return string.IsNullOrWhiteSpace(fallback) ? null : fallback;
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}
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private List<string> SnapshotSniffedUrls()
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{
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lock (sniffedUrls) return sniffedUrls.ToList();
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}
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/// <summary>
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/// 接收页面嗅探脚本回传的视频地址与播放列表文本。
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/// </summary>
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private void OnWebMessageReceived(object? sender, CoreWebView2WebMessageReceivedEventArgs e)
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{
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try
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{
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string json = e.TryGetWebMessageAsString();
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JsonNode? node = JsonNode.Parse(json);
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string? type = node?["type"]?.GetValue<string>();
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switch (type)
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{
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case "media":
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{
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string? url = node?["url"]?.GetValue<string>();
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string? referer = node?["base"]?.GetValue<string>();
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if (!string.IsNullOrEmpty(url) && VideoDownloader.LooksLikeMedia(url))
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{
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AddSniffedUrl(url, referer);
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if (VideoDownloader.IsHlsUrl(url))
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{
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SetStatus("已嗅探到 m3u8，可点击下载");
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}
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}
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break;
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}
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case "hlsText":
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{
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string? text = node?["text"]?.GetValue<string>();
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if (!string.IsNullOrEmpty(text) && text.Contains("#EXTM3U") && !sniffedPlaylists.Contains(text))
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{
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sniffedPlaylists.Add(text);
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// 只留最近几份播放列表，够用又不会越积越多
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while (sniffedPlaylists.Count > 10) sniffedPlaylists.RemoveAt(0);
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SetStatus("已抓到播放列表，可点击下载");
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}
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break;
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}
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case "downloadClick":
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// 播放器右下角的悬浮按钮
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_ = DownloadCurrentVideoAsync();
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break;
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}
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}
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catch
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{
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// 非本程序约定的消息直接忽略
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}
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}
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/// <summary>
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/// 站点自己发起的下载（例如抖音自带的下载入口）改为用户选择保存位置。
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/// </summary>
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private void OnDownloadStarting(object? sender, CoreWebView2DownloadStartingEventArgs e)
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{
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string suggested = Path.GetFileName(e.DownloadOperation.ResultFilePath);
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if (string.IsNullOrWhiteSpace(suggested))
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{
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suggested = "video.mp4";
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}
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using SaveFileDialog dlg = new SaveFileDialog
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{
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Title = "保存视频",
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FileName = suggested,
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Filter = "视频文件|*.mp4;*.ts;*.mkv;*.flv;*.mov|所有文件|*.*"
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};
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if (dlg.ShowDialog(this) != DialogResult.OK)
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{
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e.Cancel = true;
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SetStatus("已取消下载");
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return;
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}
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string target = dlg.FileName;
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e.Handled = true;
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e.ResultFilePath = target;
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SetStatus($"正在下载 {Path.GetFileName(target)}");
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CoreWebView2DownloadOperation operation = e.DownloadOperation;
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operation.BytesReceivedChanged += (s, ev) =>
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{
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ulong? total = operation.TotalBytesToReceive;
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string totalText = total > 0 ? $" / {VideoDownloader.FormatSize((long)total!.Value)}" : string.Empty;
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SetStatus($"下载中 {VideoDownloader.FormatSize(operation.BytesReceived)}{totalText}");
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};
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operation.StateChanged += (s, ev) =>
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{
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switch (operation.State)
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{
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case CoreWebView2DownloadState.Completed:
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SetStatus($"已保存 {target}");
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break;
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case CoreWebView2DownloadState.Interrupted:
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SetStatus($"下载中断：{operation.InterruptReason}");
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break;
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}
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};
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}
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private void OnNewWindowRequested(object? sender, CoreWebView2NewWindowRequestedEventArgs e)
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{
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// 抖音等站点的 window.open 在这里就地导航，避免新窗口没有嗅探脚本
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e.Handled = true;
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webView21.CoreWebView2?.Navigate(e.Uri);
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}
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private async void dlBut_Click(object sender, EventArgs e)
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{
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await DownloadCurrentVideoAsync();
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}
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/// <summary>
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/// 只下载当前正在播放的那一个视频地址，不再列出一堆候选让用户挑。
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/// </summary>
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private async Task DownloadCurrentVideoAsync()
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{
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if (webView21.CoreWebView2 == null)
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{
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SetStatus("页面还没加载好，请稍候");
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return;
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}
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if (downloadCts != null)
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{
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SetStatus("已有下载在进行中，可先点“取消下载”");
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return;
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}
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dlBut.Enabled = false;
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try
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{
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SetStatus("正在识别当前视频…");
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string raw = await webView21.CoreWebView2.ExecuteScriptAsync(BuildGrabScript());
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VideoCandidate? candidate = CollectCurrentCandidate(raw);
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if (candidate == null)
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{
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SetStatus("没识别到视频地址");
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MessageBox.Show(this,
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"没有抓到当前正在播放的视频地址。\n\n" +
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"常见原因：\r\n1. 视频还没真正开始播放，请先点播放再点本按钮；\r\n" +
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"2. 站点用了加密流（DRM），无法直接下载；\r\n" +
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"3. 视频在 iframe 里且尚未加载完，稍等一两秒重试。",
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"下载视频", MessageBoxButtons.OK, MessageBoxIcon.Information);
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return;
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}
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await DownloadVideoAsync(candidate);
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}
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catch (OperationCanceledException)
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{
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SetStatus("已取消");
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}
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catch (Exception ex)
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{
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SetStatus($"识别失败：{ex.Message}");
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MessageBox.Show(this, ex.Message, "下载视频", MessageBoxButtons.OK, MessageBoxIcon.Warning);
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}
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finally
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{
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dlBut.Enabled = true;
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}
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}
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/// <summary>
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/// 抓取脚本兜底版本：资源文件丢失时仍能取到当前 video 标签的播放地址。
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/// </summary>
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private static string BuildGrabScript()
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{
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string code = ReadScript(GrabScript);
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if (!string.IsNullOrEmpty(code))
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{
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return code;
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}
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return "(function(){var v=document.querySelector('video');"
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+ "return JSON.stringify({current:v?(v.currentSrc||v.src):'',title:document.title,pageUrl:location.href,"
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+ "sniffed:(window.__mediaUrls||[]).slice(-60),m3u8Blobs:(window.__m3u8Blobs||[]).slice(-1)});})()";
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}
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/// <summary>
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/// 只取当前正在播放的那一个视频地址，按三层递降：
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/// 1. video 标签自己的播放源（最准确，就是正在播的这个）；
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/// 2. 抖音这类 blob+MSE 播放、或播放器在 iframe 里取不到源时，
|
||
/// 退回用本页最近嗅探到的那一个整片地址（m3u8 或直链，分片不算）；
|
||
/// 3. 只在内存里拿到播放列表文本时，用页面地址做分片相对地址的基准。
|
||
/// </summary>
|
||
private VideoCandidate? CollectCurrentCandidate(string grabResultJson)
|
||
{
|
||
string current = string.Empty;
|
||
string pageUrl = string.Empty;
|
||
List<string> sniffed = new List<string>();
|
||
|
||
try
|
||
{
|
||
// ExecuteScriptAsync 返回的是 JSON 编码后的字符串，需要先脱一层引号
|
||
string? inner = JsonSerializer.Deserialize<string>(grabResultJson);
|
||
if (!string.IsNullOrEmpty(inner))
|
||
{
|
||
JsonNode? node = JsonNode.Parse(inner);
|
||
current = node?["current"]?.GetValue<string>() ?? string.Empty;
|
||
pageUrl = node?["pageUrl"]?.GetValue<string>() ?? string.Empty;
|
||
|
||
if (node?["sniffed"] is JsonArray arr)
|
||
{
|
||
foreach (JsonNode? item in arr)
|
||
{
|
||
string? u = item?.GetValue<string>();
|
||
if (!string.IsNullOrEmpty(u)) sniffed.Add(u);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
catch
|
||
{
|
||
// 页面没有返回可解析结果时，只用宿主侧嗅探到的地址
|
||
}
|
||
|
||
if (VideoDownloader.LooksLikeMedia(current) && !VideoDownloader.IsSegmentUrl(current))
|
||
{
|
||
return new VideoCandidate(current, null, pageUrl);
|
||
}
|
||
|
||
// 嗅探结果里最后一个整片地址最接近“正在播的这个”，前面翻页留下的旧地址和单个分片都不取
|
||
List<string> pool = sniffed.Concat(SnapshotSniffedUrls())
|
||
.Where(VideoDownloader.LooksLikeMedia)
|
||
.Distinct()
|
||
.ToList();
|
||
|
||
int index = pool.FindLastIndex(u => !VideoDownloader.IsSegmentUrl(u));
|
||
|
||
if (index >= 0)
|
||
{
|
||
string url = pool[index];
|
||
return new VideoCandidate(url, null, RefererFor(url, pageUrl));
|
||
}
|
||
|
||
string? text = sniffedPlaylists.Concat(ReadBlobPlaylists(grabResultJson))
|
||
.Distinct()
|
||
.LastOrDefault(t => t.Contains("#EXTM3U"));
|
||
|
||
return text == null ? null : new VideoCandidate(pageUrl, text, pageUrl);
|
||
}
|
||
|
||
private static List<string> ReadBlobPlaylists(string grabResultJson)
|
||
{
|
||
List<string> result = new List<string>();
|
||
try
|
||
{
|
||
string? inner = JsonSerializer.Deserialize<string>(grabResultJson);
|
||
if (inner != null && JsonNode.Parse(inner)?["m3u8Blobs"] is JsonArray arr)
|
||
{
|
||
foreach (JsonNode? item in arr)
|
||
{
|
||
string? text = item?.GetValue<string>();
|
||
if (!string.IsNullOrWhiteSpace(text) && text.Contains("#EXTM3U")) result.Add(text);
|
||
}
|
||
}
|
||
}
|
||
catch
|
||
{
|
||
// 忽略
|
||
}
|
||
return result;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 下载当前播放的这个地址：先让用户选保存位置，再流式落盘。
|
||
/// 地址只有一个，失败就直接报错误信息，不再翻别的地址重试。
|
||
/// </summary>
|
||
private async Task DownloadVideoAsync(VideoCandidate candidate)
|
||
{
|
||
string url = candidate.Url;
|
||
VideoDownloader namer = new VideoDownloader(RefererFor(url, webView21.CoreWebView2?.Source));
|
||
|
||
using SaveFileDialog dlg = new SaveFileDialog
|
||
{
|
||
Title = "下载视频",
|
||
FileName = namer.SuggestedFileName(url, PageTitle),
|
||
Filter = "视频文件|*.mp4;*.ts;*.mkv;*.flv;*.mov|所有文件|*.*",
|
||
AddExtension = true
|
||
};
|
||
|
||
if (dlg.ShowDialog(this) != DialogResult.OK)
|
||
{
|
||
SetStatus("已取消");
|
||
return;
|
||
}
|
||
|
||
string? failure = await TryDownloadAsync(candidate, dlg.FileName);
|
||
if (failure == null) return;
|
||
|
||
SetStatus($"下载失败：{failure}");
|
||
MessageBox.Show(this, failure, "下载视频", MessageBoxButtons.OK, MessageBoxIcon.Warning);
|
||
}
|
||
|
||
/// <summary>
|
||
/// 执行一次下载。返回 null 表示成功或用户主动取消，否则返回错误信息给上层提示。
|
||
/// </summary>
|
||
private async Task<string?> TryDownloadAsync(VideoCandidate candidate, string filePath)
|
||
{
|
||
VideoDownloader downloader = await CreateDownloaderAsync(candidate);
|
||
|
||
downloadCts = new CancellationTokenSource();
|
||
Progress<DownloadProgress> progress = new Progress<DownloadProgress>(ReportProgress);
|
||
progressBar.Visible = true;
|
||
progressBar.Value = 0;
|
||
cancelBut.Enabled = true;
|
||
SetStatus($"准备下载 {Path.GetFileName(filePath)}");
|
||
|
||
try
|
||
{
|
||
DownloadResult result = candidate.PlaylistText != null
|
||
? await downloader.DownloadFromPlaylistTextAsync(candidate.PlaylistText, candidate.Url, filePath, progress, downloadCts.Token)
|
||
: await downloader.DownloadAsync(candidate.Url, filePath, progress, downloadCts.Token);
|
||
|
||
SetStatus($"已下载 {Path.GetFileName(result.FilePath)}（{VideoDownloader.FormatSize(result.Bytes)}）");
|
||
|
||
if (MessageBox.Show(this, $"视频已保存到：\n{result.FilePath}\n\n要打开所在文件夹吗？",
|
||
"下载完成", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
|
||
{
|
||
OpenFolder(result.FilePath);
|
||
}
|
||
|
||
return null;
|
||
}
|
||
catch (OperationCanceledException)
|
||
{
|
||
// 用户主动取消就别再换地址重试了
|
||
SetStatus("已取消下载");
|
||
return null;
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
DeletePartFiles(filePath);
|
||
return ex.Message;
|
||
}
|
||
finally
|
||
{
|
||
downloadCts?.Dispose();
|
||
downloadCts = null;
|
||
progressBar.Visible = false;
|
||
cancelBut.Enabled = false;
|
||
}
|
||
}
|
||
|
||
/// <summary>
|
||
/// 用候选地址自己的 Referer 和浏览器里的 Cookie 建下载器：
|
||
/// 播放器在跨域 iframe 里时，拿顶层页面地址当 Referer 会被防盗链拒掉。
|
||
/// </summary>
|
||
private async Task<VideoDownloader> CreateDownloaderAsync(VideoCandidate candidate)
|
||
{
|
||
string? referer = candidate.Referer ?? RefererFor(candidate.Url, webView21.CoreWebView2?.Source);
|
||
string? cookie = await GetCookieHeaderAsync(candidate.Url);
|
||
return new VideoDownloader(referer, cookie);
|
||
}
|
||
|
||
private async Task<string?> GetCookieHeaderAsync(string url)
|
||
{
|
||
CoreWebView2? core = webView21.CoreWebView2;
|
||
if (core == null || !Uri.TryCreate(url, UriKind.Absolute, out Uri? uri)) return null;
|
||
|
||
try
|
||
{
|
||
var cookies = await core.CookieManager.GetCookiesAsync(uri.ToString());
|
||
string header = string.Join("; ", cookies
|
||
.Where(c => !string.IsNullOrEmpty(c.Name))
|
||
.Select(c => $"{c.Name}={c.Value}"));
|
||
return header.Length == 0 ? null : header;
|
||
}
|
||
catch
|
||
{
|
||
// 拿不到 Cookie 就按匿名请求下载
|
||
return null;
|
||
}
|
||
}
|
||
|
||
private void ReportProgress(DownloadProgress value)
|
||
{
|
||
SetStatus(value.Message);
|
||
|
||
if (value.Ratio != null)
|
||
{
|
||
progressBar.Value = (int)Math.Clamp(value.Ratio.Value * 100, 0, 100);
|
||
}
|
||
}
|
||
|
||
private void cancelBut_Click(object sender, EventArgs e)
|
||
{
|
||
try
|
||
{
|
||
downloadCts?.Cancel();
|
||
SetStatus("正在取消…");
|
||
}
|
||
catch (Exception ex)
|
||
{
|
||
SetStatus($"取消失败：{ex.Message}");
|
||
}
|
||
}
|
||
|
||
private static void DeletePartFiles(string target)
|
||
{
|
||
try
|
||
{
|
||
string part = target + ".part";
|
||
if (File.Exists(part)) File.Delete(part);
|
||
}
|
||
catch
|
||
{
|
||
// 残留的 .part 交给下次覆盖
|
||
}
|
||
}
|
||
|
||
private static void OpenFolder(string filePath)
|
||
{
|
||
try
|
||
{
|
||
System.Diagnostics.Process.Start("explorer.exe", $"/select,\"{filePath}\"");
|
||
}
|
||
catch
|
||
{
|
||
// 打不开文件夹不影响下载结果
|
||
}
|
||
}
|
||
|
||
private string PageTitle
|
||
{
|
||
get
|
||
{
|
||
try
|
||
{
|
||
return webView21.CoreWebView2?.DocumentTitle ?? string.Empty;
|
||
}
|
||
catch
|
||
{
|
||
return string.Empty;
|
||
}
|
||
}
|
||
}
|
||
|
||
#endregion
|
||
}
|
||
}
|