mirror of
https://github.com/cyanfish/naps2.git
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178 lines
5.6 KiB
C#
178 lines
5.6 KiB
C#
using System.Net.Http;
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using System.Security.Cryptography;
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using Microsoft.Extensions.Logging;
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using NAPS2.Scan;
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namespace NAPS2.Dependencies;
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public class DownloadController
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{
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private static readonly HttpClient DefaultHttpClient = new();
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private readonly ScanningContext _scanningContext;
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private readonly ILogger _logger;
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private readonly HttpClient _client;
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private readonly List<QueueItem> _filesToDownload = new();
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private bool _cancel;
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public DownloadController(ScanningContext scanningContext, HttpClient? client = null)
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{
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_scanningContext = scanningContext;
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_logger = scanningContext.Logger;
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_client = client ?? DefaultHttpClient;
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}
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public int FilesDownloaded { get; private set; }
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public int TotalFiles => _filesToDownload.Count;
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public long CurrentFileSize { get; private set; }
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public long CurrentFileProgress { get; private set; }
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public void QueueFile(DownloadInfo downloadInfo, Action<string> fileCallback)
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{
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_filesToDownload.Add(new QueueItem(downloadInfo, fileCallback));
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}
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public void QueueFile(IExternalComponent component)
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{
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_filesToDownload.Add(new QueueItem(component.DownloadInfo, component.Install));
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}
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public void Stop()
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{
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_cancel = true;
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_client.CancelPendingRequests();
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}
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public event EventHandler? DownloadError;
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public event EventHandler? DownloadComplete;
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public event EventHandler? DownloadProgress;
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private async Task<MemoryStream?> TryDownloadFromUrlAsync(string filename, string url)
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{
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CurrentFileProgress = 0;
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CurrentFileSize = 0;
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DownloadProgress?.Invoke(this, EventArgs.Empty);
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try
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{
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var response = await _client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
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response.EnsureSuccessStatusCode();
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CurrentFileSize = response.Content.Headers.ContentLength.GetValueOrDefault();
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using var contentStream = await response.Content.ReadAsStreamAsync();
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var result = new MemoryStream();
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long previousLength;
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byte[] buffer = new byte[1024 * 40];
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do
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{
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previousLength = result.Length;
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int length = await contentStream.ReadAsync(buffer, 0, buffer.Length);
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if (length > 0)
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{
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result.Write(buffer, 0, length);
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CurrentFileProgress = result.Length;
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DownloadProgress?.Invoke(this, EventArgs.Empty);
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}
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if (_cancel)
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{
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throw new OperationCanceledException();
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}
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}
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while (previousLength < result.Length);
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return result;
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}
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catch (OperationCanceledException)
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{
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throw;
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Error downloading file: {FileName}", filename);
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return null;
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}
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}
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private async Task<MemoryStream?> TryDownloadQueueItemAsync(QueueItem fileToDownload)
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{
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foreach (var url in fileToDownload.DownloadInfo.Urls)
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{
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var result = await TryDownloadFromUrlAsync(fileToDownload.DownloadInfo.FileName, url);
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if (result != null)
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{
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result.Position = 0;
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if (fileToDownload.DownloadInfo.Sha1 == CalculateSha1(result))
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{
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return result;
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}
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_logger.LogError("Error downloading file (invalid checksum): {FileName}", fileToDownload.DownloadInfo.FileName);
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}
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}
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return null;
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}
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private async Task<bool> InternalStartDownloadsAsync()
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{
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FilesDownloaded = 0;
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foreach (var fileToDownload in _filesToDownload)
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{
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MemoryStream? result;
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try
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{
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result = await TryDownloadQueueItemAsync(fileToDownload);
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}
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catch (OperationCanceledException)
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{
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return false;
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}
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if (result == null)
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{
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DownloadComplete?.Invoke(this, EventArgs.Empty);
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DownloadError?.Invoke(this, EventArgs.Empty);
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return false;
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}
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string tempFolder = Path.Combine(_scanningContext.TempFolderPath, Path.GetRandomFileName());
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Directory.CreateDirectory(tempFolder);
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string p = Path.Combine(tempFolder, fileToDownload.DownloadInfo.FileName);
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try
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{
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result.Position = 0;
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var preparedFilePath = fileToDownload.DownloadInfo.Format.Prepare(result, p);
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fileToDownload.FileCallback(preparedFilePath);
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}
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catch (Exception ex)
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{
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_logger.LogError(ex, "Error preparing downloaded file");
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DownloadError?.Invoke(this, EventArgs.Empty);
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}
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FilesDownloaded++;
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Directory.Delete(tempFolder, true);
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}
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DownloadComplete?.Invoke(this, EventArgs.Empty);
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return true;
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}
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private string CalculateSha1(Stream stream)
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{
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using var sha = SHA1.Create();
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byte[] checksum = sha.ComputeHash(stream);
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string str = BitConverter.ToString(checksum).Replace("-", String.Empty).ToLowerInvariant();
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return str;
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}
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private record QueueItem(DownloadInfo DownloadInfo, Action<string> FileCallback);
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public async Task<bool> StartDownloadsAsync()
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{
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DownloadProgress?.Invoke(this, EventArgs.Empty);
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return await InternalStartDownloadsAsync();
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}
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} |