private async Task ProcessUrl(DownloadManagerItem item, CancellationToken cancelToken)
{
try
{
using var response = await HttpClient.GetAsync(item.Url, HttpCompletionOption.ResponseHeadersRead, cancelToken);
item.StatusCode = response.StatusCode;
if (response.IsSuccessStatusCode)
{
if (item.MimeType.IsEmpty())
{
item.MimeType = MimeTypes.MapNameToMimeType(item.FileName);
}
var contentType = response.Content.Headers.ContentType?.MediaType;
if (contentType.HasValue() && !contentType.EqualsNoCase(item.MimeType))
{
// Update mime type and local path.
var extension = MimeTypes.MapMimeTypeToExtension(contentType).NullEmpty() ?? "jpg";
item.MimeType = contentType;
item.Path = Path.ChangeExtension(item.Path, extension.EnsureStartsWith('.'));
}
using var source = await response.Content.ReadAsStreamAsync(cancelToken);
using var target = File.Open(item.Path, FileMode.Create);
await source.CopyToAsync(target, cancelToken);
item.Success = true;
}
else
{
item.Success = false;
item.ErrorMessage = response.ReasonPhrase.HasValue()
? $"{response.StatusCode} ({response.ReasonPhrase})"
: response.StatusCode.ToString();
}
}
catch (Exception ex)
{
item.Success = false;
item.ErrorMessage = ex.ToAllMessages();
if (ex.InnerException is WebException webExc)
{
item.ExceptionStatus = webExc.Status;
}
}
}
private async Task ProcessUrl(DownloadManagerContext context, HttpClient client, DownloadManagerItem item)
{
try
{
var count = 0;
var canceled = false;
var bytes = new byte[_bufferSize];
using var response = await client.GetAsync(item.Url);
if (response.IsSuccessStatusCode)
{
if (response.Content.Headers.ContentType != null)
{
var contentType = response.Content.Headers.ContentType.MediaType;
if (contentType.HasValue() && !contentType.EqualsNoCase(item.MimeType))
{
// Update mime type and local path.
var extension = MimeTypes.MapMimeTypeToExtension(contentType).NullEmpty() ?? "jpg";
item.MimeType = contentType;
item.Path = Path.ChangeExtension(item.Path, extension.EnsureStartsWith('.'));
}
}
//Task <Stream> task = client.GetStreamAsync(item.Url);
Task <Stream> task = response.Content.ReadAsStreamAsync();
await task;
using (var srcStream = task.Result)
using (var dstStream = File.Open(item.Path, FileMode.Create))
{
while ((count = srcStream.Read(bytes, 0, bytes.Length)) != 0 && !canceled)
{
dstStream.Write(bytes, 0, count);
if (context.CancellationToken.IsCancellationRequested)
{
canceled = true;
}
}
}
item.Success = !task.IsFaulted && !canceled;
}
else
{
item.Success = false;
item.ErrorMessage = response.StatusCode.ToString();
}
}
catch (Exception ex)
{
try
{
item.Success = false;
item.ErrorMessage = ex.ToAllMessages();
var webExc = ex.InnerException as WebException;
if (webExc != null)
{
item.ExceptionStatus = webExc.Status;
}
if (context.Logger != null)
{
context.Logger.Error(ex, item.ToString());
}
}
catch { }
}
}
/// <summary>
/// Downloads a file asynchronously and saves it to disk.
/// </summary>
/// <param name="item">Information about the file to download.</param>
/// <param name="cancelToken">A <see cref="CancellationToken"/> to observe while waiting for the task to complete.</param>
public Task DownloadFileAsync(DownloadManagerItem item, CancellationToken cancelToken = default)
{
return(ProcessUrl(item, cancelToken));
}