最近发现一些快手的作者，作品还不错，出于学习研究的目的，决定看一下怎么爬取数据。现在网上有一些爬虫工具，不过大部分都失效了，或者不开源。于是自己就写了一个小工具。先看一下成果：

软件只需要填写作者uid以及网页版的请求Cookie，即可实现自动下载，下载目录在程序根目录下的Download文件夹。
由于快手的风控比较厉害，软件也做了应对措施。不过需要用户点击软件中的提示文字，复制粘贴到浏览器，把请求的json保存到本地文件。使用软件提供的解析本地json按钮解析下载即可。如果返回的json文件很短或者没有数据，需要在快手的任意一个页面刷新一下，也就是告诉快手风控，现在是正常浏览，没有机器人的行为。

下面说一下构建整个App的思路。

1. 快手网页端准备

打开https://live.kuaishou.com/ ，在顶部搜索你要爬取的作者昵称，进入作者主页。也可以从App端分享作者的主页链接，粘贴进来。作者主页加载完成后，地址栏的地址一定要是类似：https://live.kuaishou.com/profile/xxxxxx。后面的xxxxxx就是作者的user id。这个记住，复制出来，后面会用到。
按F12打开浏览器的开发者工具（我之前就说过开发者工具是好东西，研究爬虫必备，一定要好好学习）。
选择开发者工具顶部的“网络”，“全部”，如图所示。在请求列表中找到user id，点击它，右面就会出来请求的标头。里面有个Cookie，需要记住，复制出来。如果没有的话，记得刷新页面。
在列表里面可以看到很多请求，我们需要从中找到网页端展示作品列表的那条请求，即public开头的，或者直接在左上角搜索public，即可过滤绝大部分无关请求。这个请求的响应数据里面有作者作品的完整json响应。

你可以右击它，在新标签页面打开，打开后地址栏会显示完成的浏览器请求地址。这个网址需要记住，后续会用到。那个count默认是12或者20，我们用到时候，直接拉满，9999即可。

2. Postman拦截请求，模拟请求，并生成C#请求代码

安装postman interceptor拦截器，安装地址https://chromewebstore.google.com/detail/postman-interceptor/aicmkgpgakddgnaphhhpliifpcfhicfo 不得不说，这又是一个神器，搭配开发者工具，理论上可以搞定几乎所有的爬虫需求了。
打开Postman，点击右下角的Start Proxy，

开启拦截后，重新回到网页版作者主页，刷新一下页面，等页面加载完成后，点击停止拦截。否则列表会一直增多，因为他会拦截电脑的所有网络请求。这时Postman拦截器就会拦截到一大堆请求，同理，找到public请求，或者在左上角输入public，即可过滤出来我们需要的。

点击这个请求链接

这是Postman会打开一个新的窗口，包含了请求这个链接的所有参数以及标头信息。

点击Postman最右面的代码工具即可生成我们需要的代码。你可以选择C#、python、js、curl等等。

3. 使用WPF写界面以及下载逻辑

新建WPF工程，为了界面好看，这次我用了开源的WPF UI，之前用过HandyControl、MicaWPF，这些都是不错的UI控件库。
下载使用了开源的Downloader，请求使用了RestSharp，解析Json使用NewtonsoftJson，另外推荐一个免费的图标库FlatIcon。
界面如下：

点击查看代码

<ui:FluentWindow
  x:Class="KuaishouDownloader.MainWindow"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
  xmlns:local="clr-namespace:KuaishouDownloader"
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  xmlns:ui="http://schemas.lepo.co/wpfui/2022/xaml"
  Title="MainWindow"
  Width="900"
  Height="760"
  ExtendsContentIntoTitleBar="True"
  WindowBackdropType="Mica"
  WindowCornerPreference="Default"
  WindowStartupLocation="CenterScreen"
  mc:Ignorable="d">
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto" />
      <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <ui:TitleBar Title="快手作者主页作品爬取" Height="32" />
    <ui:Button
      x:Name="themeButton"
      Grid.Row="1"
      Width="32"
      Height="32"
      Margin="0,0,8,0"
      Padding="0"
      HorizontalAlignment="Right"
      VerticalAlignment="Top"
      Click="Theme_Click"
      CornerRadius="16"
      FontSize="24"
      Icon="{ui:SymbolIcon WeatherMoon48}"
      ToolTip="切换主题" />
    <ui:SnackbarPresenter
      x:Name="snackbarPresenter"
      Grid.Row="1"
      VerticalAlignment="Bottom" />
    <StackPanel
      Grid.Row="1"
      HorizontalAlignment="Center"
      VerticalAlignment="Center">
      <Border
        Width="200"
        Height="200"
        HorizontalAlignment="Center"
        CornerRadius="100">
        <ui:Image
          x:Name="imgHeader"
          Width="200"
          Height="200"
          CornerRadius="100" />
      </Border>
      <ui:TextBlock
        x:Name="tbNickName"
        Margin="0,12,0,0"
        HorizontalAlignment="Center" />
      <StackPanel Margin="0,12,0,0" Orientation="Horizontal">
        <ui:TextBlock
          Width="60"
          Margin="0,12,0,0"
          VerticalAlignment="Center"
          Text="uid" />
        <ui:TextBox
          x:Name="tbUid"
          Width="660"
          Height="36"
          VerticalContentAlignment="Center"
          ToolTip="App进入作者主页，分享主页-复制链接，用浏览器打开链接，地址栏一般变为https://www.kuaishou.com/profile/xxxxxx/开头的，复制xxxxxx过来" />
      </StackPanel>
      <StackPanel Margin="0,12,0,0" Orientation="Horizontal">
        <ui:TextBlock
          Width="60"
          VerticalAlignment="Center"
          Text="cookie" />
        <ui:TextBox
          x:Name="tbCookie"
          Width="660"
          Height="36"
          VerticalContentAlignment="Center"
          ToolTip="利用浏览器开发者工具，从网络-请求标头中获取" />
      </StackPanel>
      <StackPanel
        Margin="0,12,0,0"
        HorizontalAlignment="Center"
        Orientation="Horizontal">
        <ui:Button
          x:Name="btnDownload"
          Height="32"
          Appearance="Primary"
          Click="Download_Click"
          Content="开始下载"
          CornerRadius="4 0 0 4"
          ToolTip="默认下载到程序根目录下，文件日期为作品发布日期" />
        <ui:Button
          x:Name="btnParseJson"
          Height="32"
          Appearance="Primary"
          Click="ParseJson_Click"
          Content="..."
          CornerRadius="0 4 4 0"
          ToolTip="解析从web或者postman保存的json数据" />
      </StackPanel>
      <TextBlock
        Width="700"
        Margin="0,12,0,0"
        Foreground="Gray"
        MouseDown="CopyUrl"
        Text="被快手风控不要慌，浏览器打开快手网页版，扫码登陆，点击我复制网址，粘贴到浏览器打开。打开后如果有很长很长的json数据返回，就对了。复制json保存到本地json文件，然后用第二个按钮解析json数据即可下载。"
        TextWrapping="Wrap" />
      <Expander Margin="0,12,0,0" Header="更多选项">
        <StackPanel Orientation="Horizontal">
          <CheckBox
            x:Name="cbAddDate"
            Margin="12,0,0,0"
            VerticalAlignment="Center"
            Content="文件名前加上日期"
            IsChecked="True"
            ToolTip="文件名前面加上类似2024-01-02 13-00-00的标识，方便排序" />
          <CheckBox
            x:Name="cbLongInterval"
            Margin="12,0,0,0"
            VerticalAlignment="Center"
            Content="增加作品下载延时"
            IsChecked="True"
            ToolTip="默认勾选，作品间下载延时5~10秒。取消勾选1~5秒随机，可能被风控" />
        </StackPanel>
      </Expander>
    </StackPanel>
    <StackPanel
      Grid.Row="1"
      Margin="0,0,0,-2"
      VerticalAlignment="Bottom">
      <TextBlock x:Name="tbProgress" HorizontalAlignment="Center" />
      <ProgressBar x:Name="progress" Height="8" />
    </StackPanel>
    <ui:Button
      x:Name="infoButton"
      Grid.Row="1"
      Width="32"
      Height="32"
      Margin="0,0,8,8"
      Padding="0"
      HorizontalAlignment="Right"
      VerticalAlignment="Bottom"
      Click="Info_Click"
      CornerRadius="16"
      FontSize="24"
      Icon="{ui:SymbolIcon Info28}"
      ToolTip="鸣谢" />
    <ui:Flyout
      x:Name="flyout"
      Grid.Row="1"
      HorizontalAlignment="Right">
      <ui:TextBlock Text="鸣谢: &#xA;1. Microsoft Presentation Foundation&#xA;2. WPF-UI&#xA;3. RestSharp&#xA;4. Newtonsoft.Json&#xA;5. Downloader&#xA;6. Icon from FlatIcon" />
    </ui:Flyout>
  </Grid>
</ui:FluentWindow>

后台逻辑没有使用MVVM，就是图方便。

点击查看代码

using KuaishouDownloader.Models;
using Newtonsoft.Json;
using RestSharp;
using System.Diagnostics;
using System.IO;
using System.Text.RegularExpressions;
using System.Windows;
using Wpf.Ui;
using Wpf.Ui.Controls;

namespace KuaishouDownloader
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow
    {
        string downloadFolder = AppContext.BaseDirectory;
        SnackbarService? snackbarService = null;

        public MainWindow()
        {
            InitializeComponent();
            this.Loaded += MainWindow_Loaded;
        }

        private void MainWindow_Loaded(object sender, RoutedEventArgs e)
        {
            snackbarService = new SnackbarService();
            snackbarService.SetSnackbarPresenter(snackbarPresenter);

            if (File.Exists("AppConfig.json"))
            {
                var model = JsonConvert.DeserializeObject<AppConfig>(File.ReadAllText("AppConfig.json"));
                if (model != null)
                {
                    tbUid.Text = model.Uid;
                    tbCookie.Text = model.Cookie;
                }
            }
        }

        private void Theme_Click(object sender, RoutedEventArgs e)
        {
            if (Wpf.Ui.Appearance.ApplicationThemeManager.GetAppTheme() == Wpf.Ui.Appearance.ApplicationTheme.Light)
            {
                themeButton.Icon = new SymbolIcon(SymbolRegular.WeatherSunny48);
                Wpf.Ui.Appearance.ApplicationThemeManager.Apply(Wpf.Ui.Appearance.ApplicationTheme.Dark);
            }
            else
            {
                themeButton.Icon = new SymbolIcon(SymbolRegular.WeatherMoon48);
                Wpf.Ui.Appearance.ApplicationThemeManager.Apply(Wpf.Ui.Appearance.ApplicationTheme.Light);
            }
        }

        private async void Download_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                btnDownload.IsEnabled = false;
                btnParseJson.IsEnabled = false;

                if (string.IsNullOrEmpty(tbUid.Text) || string.IsNullOrEmpty(tbCookie.Text))
                {
                    snackbarService?.Show("提示", $"请输入uid以及cookie", ControlAppearance.Caution, null, TimeSpan.FromSeconds(3));
                    return;
                }

                var json = JsonConvert.SerializeObject(new AppConfig() { Uid = tbUid.Text, Cookie = tbCookie.Text }, Formatting.Indented);
                File.WriteAllText("AppConfig.json", json);

                var options = new RestClientOptions("https://live.kuaishou.com")
                {
                    Timeout = TimeSpan.FromSeconds(15),
                    UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36",
                };
                var client = new RestClient(options);
                var request = new RestRequest($"/live_api/profile/public?count=9999&pcursor=&principalId={tbUid.Text}&hasMore=true", Method.Get);
                request.AddHeader("host", "live.kuaishou.com");
                request.AddHeader("connection", "keep-alive");
                request.AddHeader("cache-control", "max-age=0");
                request.AddHeader("sec-ch-ua", "\"Not)A;Brand\";v=\"99\", \"Google Chrome\";v=\"127\", \"Chromium\";v=\"127\"");
                request.AddHeader("sec-ch-ua-mobile", "?0");
                request.AddHeader("sec-ch-ua-platform", "\"Windows\"");
                request.AddHeader("upgrade-insecure-requests", "1");
                request.AddHeader("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");
                request.AddHeader("sec-fetch-site", "none");
                request.AddHeader("sec-fetch-mode", "navigate");
                request.AddHeader("sec-fetch-user", "?1");
                request.AddHeader("sec-fetch-dest", "document");
                request.AddHeader("accept-encoding", "gzip, deflate, br, zstd");
                request.AddHeader("accept-language", "zh,en;q=0.9,zh-CN;q=0.8");
                request.AddHeader("cookie", tbCookie.Text);
                request.AddHeader("x-postman-captr", "9467712");
                RestResponse response = await client.ExecuteAsync(request);
                Debug.WriteLine(response.Content);

                var model = JsonConvert.DeserializeObject<KuaishouModel>(response.Content!);
                if (model == null || model?.Data?.List == null || model?.Data?.List?.Count == 0)
                {
                    snackbarService?.Show("提示", $"获取失败，可能触发了快手的风控机制，请等一段时间再试。", ControlAppearance.Danger, null, TimeSpan.FromSeconds(3));
                    return;
                }

                await Download(model!);
            }
            finally
            {
                btnDownload.IsEnabled = true;
                btnParseJson.IsEnabled = true;
            }
        }

        private async void ParseJson_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                btnDownload.IsEnabled = false;
                btnParseJson.IsEnabled = false;

                var dialog = new Microsoft.Win32.OpenFileDialog();
                dialog.Filter = "Json文件(.Json)|*.json";
                bool? result = dialog.ShowDialog();
                if (result == false)
                {
                    return;
                }
                var model = JsonConvert.DeserializeObject<KuaishouModel>(File.ReadAllText(dialog.FileName)!);
                if (model == null || model?.Data?.List == null || model?.Data?.List?.Count == 0)
                {
                    snackbarService?.Show("提示", $"不是正确的json", ControlAppearance.Caution, null, TimeSpan.FromSeconds(3));
                    return;
                }

                await Download(model!);
            }
            finally
            {
                btnDownload.IsEnabled = true;
                btnParseJson.IsEnabled = true;
            }
        }

        private async Task Download(KuaishouModel model)
        {
            progress.Value = 0;
            progress.Minimum = 0;
            progress.Maximum = (double)model?.Data?.List?.Count!;
            snackbarService?.Show("提示", $"解析到{model?.Data?.List?.Count!}个作品，开始下载", ControlAppearance.Success, null, TimeSpan.FromSeconds(5));

            imgHeader.Source = new System.Windows.Media.Imaging.BitmapImage(new Uri(model?.Data?.List?[0]?.Author?.Avatar!));
            tbNickName.Text = model?.Data?.List?[0]?.Author?.Name;

            string pattern = @"\d{4}/\d{2}/\d{2}/\d{2}";

            for (int i = 0; i < model?.Data?.List!.Count; i++)
            {
                DateTime dateTime = DateTime.Now;
                string fileNamePrefix = "";
                var item = model?.Data?.List[i]!;
                Match match = Regex.Match(item.Poster!, pattern);
                if (match.Success)
                {
                    dateTime = new DateTime(int.Parse(match.Value.Split("/")[0]), int.Parse(match.Value.Split("/")[1]),
                        int.Parse(match.Value.Split("/")[2]), int.Parse(match.Value.Split("/")[3]), 0, 0);
                    if (cbAddDate.IsChecked == true)
                        fileNamePrefix = match.Value.Split("/")[0] + "-" + match.Value.Split("/")[1] + "-" + match.Value.Split("/")[2]
                            + " " + match.Value.Split("/")[3] + "-00-00 ";
                }
                downloadFolder = Path.Combine(AppContext.BaseDirectory, "Download", item?.Author?.Name! + "(" + item?.Author?.Id! + ")");
                Directory.CreateDirectory(downloadFolder);

                switch (item?.WorkType)
                {
                    case "single":
                    case "vertical":
                    case "multiple":
                        {
                            await DownLoadHelper.Download(item?.ImgUrls!, dateTime, downloadFolder, fileNamePrefix);
                        }
                        break;
                    case "video":
                        {
                            await DownLoadHelper.Download(new List<string>() { item?.PlayUrl! }, dateTime, downloadFolder, fileNamePrefix);
                        }
                        break;
                }

                progress.Value = i + 1;
                tbProgress.Text = $"{i + 1} / {model?.Data?.List!.Count}";
                Random random = new Random();
                if (cbLongInterval.IsChecked == true)
                    await Task.Delay(random.Next(5000, 10000));
                else
                    await Task.Delay(random.Next(1000, 5000));
            }

            snackbarService?.Show("提示", $"下载完成，共下载{model?.Data?.List!.Count}个作品", ControlAppearance.Success, null, TimeSpan.FromDays(1));
        }

        private void CopyUrl(object sender, System.Windows.Input.MouseButtonEventArgs e)
        {
            if (string.IsNullOrEmpty(tbUid.Text))
            {
                snackbarService?.Show("提示", "请输入uid以及cookie", ControlAppearance.Caution, null, TimeSpan.FromSeconds(3));
                return;
            }
            Clipboard.SetText($"https://live.kuaishou.com/live_api/profile/public?count=9999&pcursor=&principalId={tbUid.Text}&hasMore=true");

            snackbarService?.Show("提示", "复制完成，请粘贴到浏览器打开", ControlAppearance.Success, null, TimeSpan.FromSeconds(3));
        }

        private void Info_Click(object sender, RoutedEventArgs e)
        {
            flyout.IsOpen = true;
        }
    }
}

下载类，下载完文件后，将文件的日志修改为发表日志，方便排序以及数据分析。

点击查看代码

public static async Task Download(List<string> urls, DateTime dateTime, string downloadFolder, string fileNamePrefix)
{
    string file = string.Empty;
    try
    {
        var downloader = new DownloadService();
        foreach (var url in urls)
        {
            Uri uri = new Uri(url);
            file = downloadFolder + "\\" + fileNamePrefix + Path.GetFileName(uri.LocalPath);
            if (!File.Exists(file))
                await downloader.DownloadFileTaskAsync(url, file);

            //修改文件日期时间为发博的时间
            File.SetCreationTime(file, dateTime);
            File.SetLastWriteTime(file, dateTime);
            File.SetLastAccessTime(file, dateTime);
        }
    }
    catch
    {
        Debug.WriteLine(file);
        Trace.Listeners.Add(new TextWriterTraceListener(downloadFolder + "\\_FailedFiles.txt", "myListener"));
        Trace.TraceInformation(file);
        Trace.Flush();
    }
}