C#使用CefSharp自定义缓存实现

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        // CachePath需要为绝对路径
        var settings = new CefSettings
        {
            CachePath = $"{AppDomain.CurrentDomain.BaseDirectory}DefaultCaches"
        };
        Cef.Initialize(settings);
    }
}

var cacheController = Cef.GetGlobalRequestContext().CacheController;
cacheController.SetCacheLimit(100 * 1024 * 1024); // 100MB

public TestCefCacheView()
{
    InitializeComponent();
    var handler = new CefRequestHandlerc();
    CefBrowser.RequestHandler = handler;
}

using CefSharp;
using CefSharp.Handler;
namespace WpfWithCefSharpcacheDemo.Caches;
internal class CefRequestHandlerc : RequestHandler
{
    protected override IResourceRequestHandler GetResourceRequestHandler(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame,
        IRequest request, bool isNavigation, bool isDownload, string requestInitiator, ref bool disableDefaultHandling)
    {
        // 一个请求用一个CefResourceRequestHandler
        return new CefResourceRequestHandler();
    }
}

using System.Collections.Specialized;
using CefSharp;
using CefSharp.Handler;
namespace WpfWithCefSharpCacheDemo.Caches;
internal class CefResourceRequestHandler : ResourceRequestHandler
{
    private string _localCacheFilePath;
    private bool IsLocalCacheFileExist => System.IO.File.Exists(_localCacheFilePath);
    protected override IResourceHandler? GetResourceHandler(IWebBrowser chromiumWebBrowser, IBrowser browser,
        IFrame frame, IRequest request)
    {
        try
        {
            _localCacheFilePath = CacheFileHelper.CalculateResourceFileName(request.Url, request.ResourceType);
            if (string.IsNullOrWhiteSpace(_localCacheFilePath))
            {
                return null;
            }
        }
        catch
        {
            return null;
        }
        if (!IsLocalCacheFileExist)
        {
            return null;
        }
        return new CefResourceHandler(_localCacheFilePath);
    }
    protected override IResponseFilter? GetResourceResponseFilter(IWebBrowser chromiumWebBrowser, IBrowser browser,
        IFrame frame,
        IRequest request, IResponse response)
    {
        return IsLocalCacheFileExist ? null : new CefResponseFilter { LocalCacheFilePath = _localCacheFilePath };
    }
    protected override CefReturnValue OnBeforeResourceLoad(IWebBrowser chromiumWebBrowser, IBrowser browser,
        IFrame frame, IRequest request,
        IRequestCallback callback)
    {
        var headers = new NameValueCollection(request.Headers);
        headers["Authorization"] = "Bearer xxxxxx.xxxxx.xxx";
        request.Headers = headers;
        return CefReturnValue.Continue;
    }
}

using CefSharp;
using System.IO;
namespace WpfWithCefSharpCacheDemo.Caches;
internal class CefResourceHandler : ResourceHandler
{
    public CefResourceHandler(string filePath, string mimeType = null, bool autoDisposeStream = false,
        string charset = null) : base()
    {
        if (string.IsNullOrWhiteSpace(mimeType))
        {
            var fileExtension = Path.GetExtension(filePath);
            mimeType = Cef.GetMimeType(fileExtension);
            mimeType = mimeType ?? DefaultMimeType;
        }
        var stream = File.OpenRead(filePath);
        StatusCode = 200;
        StatusText = "OK";
        MimeType = mimeType;
        Stream = stream;
        AutoDisposeStream = autoDisposeStream;
        Charset = charset;
        Headers.Add("Access-Control-Allow-Origin", "*");
    }
}

public class MyResponseFilter : IResponseFilter
{
    private MemoryStream outputStream = new MemoryStream();
    public void Dispose()
    {
        outputStream.Dispose();
    }
    public bool InitFilter()
    {
        return true;
    }
    public FilterStatus Filter(Stream dataIn, out long dataInRead, Stream dataOut, out long dataOutWritten)
    {
        dataInRead = 0;
        dataOutWritten = 0;
        byte[] buffer = new byte[4096];
        int bytesRead = 0;
        do
        {
            bytesRead = dataIn.Read(buffer, 0, buffer.Length);
            if (bytesRead > 0)
            {
                outputStream.Write(buffer, 0, bytesRead);
            }
        } while (bytesRead > 0);
        byte[] outputBytes = outputStream.ToArray();
        dataOut.Write(outputBytes, 0, outputBytes.Length);
        dataInRead = outputBytes.Length;
        dataOutWritten = outputBytes.Length;
        return FilterStatus.Done;
    }
    public int GetResponseFilterBufferSize()
    {
        return 0;
    }
    public int GetResponseFilterDelay()
    {
        return 0;
    }
}

using CefSharp;
using System.IO;
namespace WpfWithCefSharpCacheDemo.Caches;
internal class CefResponseFilter : IResponseFilter
{
    public string LocalCacheFilePath { get; set; }
    private const int BUFFER_LENGTH = 1024;
    private bool isFailCacheFile;
    public FilterStatus Filter(Stream? dataIn, out long dataInRead, Stream? dataOut, out long dataOutWritten)
    {
        dataInRead = 0;
        dataOutWritten = 0;
        if (dataIn == null)
        {
            return FilterStatus.NeedMoreData;
        }
        var length = dataIn.Length;
        var data = new byte[BUFFER_LENGTH];
        var count = dataIn.Read(data, 0, BUFFER_LENGTH);
        dataInRead = count;
        dataOutWritten = count;
        dataOut?.Write(data, 0, count);
        try
        {
            CacheFile(data, count);
        }
        catch
        {
            // ignored
        }
        return length == dataIn.Position ? FilterStatus.Done : FilterStatus.NeedMoreData;
    }
    public bool InitFilter()
    {
        try
        {
            var dirPath = Path.GetDirectoryName(LocalCacheFilePath);
            if (!string.IsNullOrWhiteSpace(dirPath) && !Directory.Exists(dirPath))
            {
                Directory.CreateDirectory(dirPath);
            }
        }
        catch
        {
            // ignored
        }
        return true;
    }
    public void Dispose()
    {
    }
    private void CacheFile(byte[] data, int count)
    {
        if (isFailCacheFile)
        {
            return;
        }
        try
        {
            if (!File.Exists(LocalCacheFilePath))
            {
                using var fs = File.Create(LocalCacheFilePath);
                fs.Write(data, 0, count);
            }
            else
            {
                using var fs = File.Open(LocalCacheFilePath, FileMode.Append);
                fs.Write(data,0,count);
            }
        }
        catch
        {
            isFailCacheFile = true;
            File.Delete(LocalCacheFilePath);
        }
    }
}

using CefSharp;
using System;
using System.Collections.Generic;
using System.IO;
namespace WpfWithCefSharpCacheDemo.Caches;
internal static class CacheFileHelper
{
    private const string DEV_TOOLS_SCHEME = "devtools";
    private const string DEFAULT_INDEX_FILE = "index.html";
    private static HashSet<string> needInterceptedAjaxInterfaces = new();
    private static string CachePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "caches");
    public static void AddInterceptedAjaxInterfaces(string url)
    {
        if (needInterceptedAjaxInterfaces.Contains(url))
        {
            return;
        }
        needInterceptedAjaxInterfaces.Add(url);
    }
    private static bool IsNeedInterceptedAjaxInterface(string url, ResourceType resourceType)
    {
        var uri = new Uri(url);
        if (DEV_TOOLS_SCHEME == url)
        {
            return false;
        }
        if (ResourceType.Xhr == resourceType && !needInterceptedAjaxInterfaces.Contains(url))
        {
            return false;
        }
        return true;
    }
    public static string? CalculateResourceFileName(string url, ResourceType resourceType)
    {
        if (!IsNeedInterceptedAjaxInterface(url, resourceType))
        {
            return default;
        }
        var uri = new Uri(url);
        var urlPath = uri.LocalPath;
        if (urlPath.StartsWith("/"))
        {
            urlPath = urlPath.Substring(1);
        }
        var subFilePath = urlPath;
        if (ResourceType.MainFrame == resourceType || string.IsNullOrWhiteSpace(urlPath))
        {
            subFilePath = Path.Combine(urlPath, DEFAULT_INDEX_FILE);
        }
        var hostCachePath = Path.Combine(CachePath, uri.Host);
        var fullFilePath = Path.Combine(hostCachePath, subFilePath);
        return fullFilePath;
    }
}