Add Helper folder

v2rayN/ServiceLib/Helper/DownloaderHelper.cs

@@ -0,0 +1,180 @@
+using System.Net;
+using Downloader;
+
+namespace ServiceLib.Helper;
+
+public class DownloaderHelper
+{
+    private static readonly Lazy<DownloaderHelper> _instance = new(() => new());
+    public static DownloaderHelper Instance => _instance.Value;
+
+    public async Task<string?> DownloadStringAsync(IWebProxy? webProxy, string url, string? userAgent, int timeout)
+    {
+        if (url.IsNullOrEmpty())
+        {
+            return null;
+        }
+
+        Uri uri = new(url);
+        //Authorization Header
+        var headers = new WebHeaderCollection();
+        if (uri.UserInfo.IsNotEmpty())
+        {
+            headers.Add(HttpRequestHeader.Authorization, "Basic " + Utils.Base64Encode(uri.UserInfo));
+        }
+
+        var downloadOpt = new DownloadConfiguration()
+        {
+            Timeout = timeout * 1000,
+            MaxTryAgainOnFailure = 2,
+            RequestConfiguration =
+                {
+                    Headers = headers,
+                    UserAgent = userAgent,
+                    Timeout = timeout * 1000,
+                    Proxy = webProxy
+                }
+        };
+
+        await using var downloader = new Downloader.DownloadService(downloadOpt);
+        downloader.DownloadFileCompleted += (sender, value) =>
+        {
+            if (value.Error != null)
+            {
+                throw value.Error;
+            }
+        };
+
+        using var cts = new CancellationTokenSource();
+        await using var stream = await downloader.DownloadFileTaskAsync(address: url, cts.Token).WaitAsync(TimeSpan.FromSeconds(timeout), cts.Token);
+        using StreamReader reader = new(stream);
+
+        downloadOpt = null;
+
+        return await reader.ReadToEndAsync(cts.Token);
+    }
+
+    public async Task DownloadDataAsync4Speed(IWebProxy webProxy, string url, IProgress<string> progress, int timeout)
+    {
+        if (url.IsNullOrEmpty())
+        {
+            throw new ArgumentNullException(nameof(url));
+        }
+
+        var downloadOpt = new DownloadConfiguration()
+        {
+            Timeout = timeout * 1000,
+            MaxTryAgainOnFailure = 2,
+            RequestConfiguration =
+                {
+                    Timeout= timeout * 1000,
+                    Proxy = webProxy
+                }
+        };
+
+        var totalDatetime = DateTime.Now;
+        var totalSecond = 0;
+        var hasValue = false;
+        double maxSpeed = 0;
+        await using var downloader = new Downloader.DownloadService(downloadOpt);
+        //downloader.DownloadStarted += (sender, value) =>
+        //{
+        //    if (progress != null)
+        //    {
+        //        progress.Report("Start download data...");
+        //    }
+        //};
+        downloader.DownloadProgressChanged += (sender, value) =>
+        {
+            var ts = DateTime.Now - totalDatetime;
+            if (progress != null && ts.Seconds > totalSecond)
+            {
+                hasValue = true;
+                totalSecond = ts.Seconds;
+                if (value.BytesPerSecondSpeed > maxSpeed)
+                {
+                    maxSpeed = value.BytesPerSecondSpeed;
+                    var speed = (maxSpeed / 1000 / 1000).ToString("#0.0");
+                    progress.Report(speed);
+                }
+            }
+        };
+        downloader.DownloadFileCompleted += (sender, value) =>
+        {
+            if (progress != null)
+            {
+                if (!hasValue && value.Error != null)
+                {
+                    progress.Report(value.Error?.Message);
+                }
+            }
+        };
+        //progress.Report("......");
+        using var cts = new CancellationTokenSource();
+        cts.CancelAfter(timeout * 1000);
+        await using var stream = await downloader.DownloadFileTaskAsync(address: url, cts.Token);
+
+        downloadOpt = null;
+    }
+
+    public async Task DownloadFileAsync(IWebProxy? webProxy, string url, string fileName, IProgress<double> progress, int timeout)
+    {
+        if (url.IsNullOrEmpty())
+        {
+            throw new ArgumentNullException(nameof(url));
+        }
+        if (fileName.IsNullOrEmpty())
+        {
+            throw new ArgumentNullException(nameof(fileName));
+        }
+        if (File.Exists(fileName))
+        {
+            File.Delete(fileName);
+        }
+
+        var downloadOpt = new DownloadConfiguration()
+        {
+            Timeout = timeout * 1000,
+            MaxTryAgainOnFailure = 2,
+            RequestConfiguration =
+                {
+                    Timeout= timeout * 1000,
+                    Proxy = webProxy
+                }
+        };
+
+        var progressPercentage = 0;
+        var hasValue = false;
+        await using var downloader = new Downloader.DownloadService(downloadOpt);
+        downloader.DownloadStarted += (sender, value) => progress?.Report(0);
+        downloader.DownloadProgressChanged += (sender, value) =>
+        {
+            hasValue = true;
+            var percent = (int)value.ProgressPercentage;//   Convert.ToInt32((totalRead * 1d) / (total * 1d) * 100);
+            if (progressPercentage != percent && percent % 10 == 0)
+            {
+                progressPercentage = percent;
+                progress.Report(percent);
+            }
+        };
+        downloader.DownloadFileCompleted += (sender, value) =>
+        {
+            if (progress != null)
+            {
+                if (hasValue && value.Error == null)
+                {
+                    progress.Report(101);
+                }
+                else if (value.Error != null)
+                {
+                    throw value.Error;
+                }
+            }
+        };
+
+        using var cts = new CancellationTokenSource();
+        await downloader.DownloadFileTaskAsync(url, fileName, cts.Token);
+
+        downloadOpt = null;
+    }
+}