/// <summary>
/// Get properties of file asynchronously.
/// </summary>
/// <returns>
/// FileProperties in asynchronous task.
/// </returns>
/// <param name="uri">URI of file.</param>
private static async Task <FileProperties> GetFilePropertiesAsync(string uri)
{
try
{
using (var request = new HttpRequestMessage(HttpMethod.Get, uri))
{
request.SetTimeout(TimeSpan.FromSeconds(Singleton.Settings.TimeoutSeconds));
request.Headers.Range = new RangeHeaderValue(from: 0, to: 0);
request.Headers.Add("User-Agent", Path.GetFileNameWithoutExtension(AppDomain.CurrentDomain.FriendlyName));
string[] s = new Uri(uri).UserInfo.Split(':');
if (s != null && s.Length == 2)
{
Console.WriteLine($"{uri}: Authenticating with Basic authentication...");
BasicAuthentication(request, s);
}
using (var response = await HttpClient.SendAsync(request))
{
response.EnsureSuccessStatusCode();
FileProperties properties = new FileProperties();
if (response.Content.Headers.ContentDisposition == null)
{
if (response.Content.Headers.TryGetValues("Content-Disposition", out IEnumerable <string> contentDisposition))
{
response.Content.Headers.ContentDisposition = ContentDispositionHeaderValue.Parse(contentDisposition.ToArray()[0].TrimEnd(';').Replace("\"", ""));
}
}
properties.Name = response.Content.Headers?.ContentDisposition?.FileName ?? response.RequestMessage.RequestUri.Segments.LastOrDefault();
if (response.Content.Headers.TryGetValues(@"Content-Range", out IEnumerable <string> range))
{
properties.Size = long.Parse(System.Text.RegularExpressions.Regex.Match(range.Single(), @"(?<=^bytes\s[0-9]+\-[0-9]+/)[0-9]+$").Value);
}
else
{
properties.Size = 0;
}
properties.RangeAccepted = response.Headers.AcceptRanges.Contains("bytes");
properties.ContentStream = await response.Content.ReadAsStreamAsync();
return(properties);
}
}
}
catch (Exception e)
{
throw e;
}
}
/// <summary>
/// Prepare file for download asynchronously.
/// </summary>
/// <returns>
/// Boolean of whether preparation is successful in asynchronous task.
/// </returns>
/// <param name="uri">URI of file.</param>
public async Task <bool> LoadFileAsync(string uri)
{
try
{
int retry = Singleton.Settings.TimeoutRetries;
FileProperties properties = null;
while (retry >= 0 && properties == null)
{
await Task.Delay(TimeSpan.FromSeconds((Singleton.Settings.TimeoutRetries - retry) * Singleton.Settings.LinearBackoffInterval));
try
{
properties = await GetFilePropertiesAsync(uri);
}
catch (TimeoutException te)
{
retry--;
Console.WriteLine($"{uri}: {te.GetType().FullName}: {te.Message}");
}
catch (Exception e)
{
Console.WriteLine($"{uri}: {e.GetType().FullName}: {e.Message}");
return(false);
}
}
_filePath = $"{Singleton.Settings.DownloadLocation}/{properties.Name}";
if (properties == null)
{
return(false);
}
else if (properties.Name == "/")
{
Console.WriteLine($"{uri}: URI is not a file");
return(false);
}
else if (properties.Size == 0)
{
return(true);
}
// Uncomment to debug properties
//var dump = ObjectDumper.Dump(properties);
//Console.WriteLine(dump);
if (!properties.RangeAccepted)
{
Console.WriteLine($"{uri}: Segmented downloading not supported, continuing with normal download...");
}
int count = 0;
foreach (var(start, end) in SegmentPosition(properties.Size, properties.RangeAccepted ? Singleton.Settings.SegmentsPerFile : 1))
{
retry = Singleton.Settings.TimeoutRetries;
count++;
bool isSuccessStatusCode = false;
while (retry >= 0 && !isSuccessStatusCode)
{
await Task.Delay(TimeSpan.FromSeconds((Singleton.Settings.TimeoutRetries - retry) * Singleton.Settings.LinearBackoffInterval));
Console.WriteLine($"{uri}: Building segment {count}...");
try
{
using (var request = new HttpRequestMessage(HttpMethod.Get, uri))
{
string[] s = new Uri(uri).UserInfo.Split(':');
if (s != null && s.Length == 2)
{
Console.WriteLine($"{uri}: Authenticating with Basic authentication...");
BasicAuthentication(request, s);
}
request.SetTimeout(TimeSpan.FromSeconds(Singleton.Settings.TimeoutSeconds));
request.Headers.Range = new RangeHeaderValue(start, end);
request.Headers.Add("User-Agent", Path.GetFileNameWithoutExtension(AppDomain.CurrentDomain.FriendlyName));
var responseMessage = await HttpClient.SendAsync(request);
isSuccessStatusCode = responseMessage.IsSuccessStatusCode;
responseMessage.EnsureSuccessStatusCode();
_fileSegments.Add(new FileSegment
{
ID = count,
Start = start,
End = end,
BytesRead = 0,
Content = await responseMessage.Content.ReadAsStreamAsync()
});
}
}
catch (TimeoutException te)
{
retry--;
Console.WriteLine($"{uri}: {te.GetType().FullName}: {te.Message}");
}
catch (Exception e)
{
Console.WriteLine($"{uri}: {e.GetType().FullName}: {e.Message}");
}
}
}
// Uncomment to debug fileSegments
//dump = ObjectDumper.Dump(fileSegments);
//Console.WriteLine(dump);
}
catch (Exception e)
{
Console.WriteLine($"{uri}: {e.GetType().FullName}: {e.Message}");
return(false);
}
return(true);
}
