private static async Task <long> GetFileSizeAsync(string url)
{
using var httpRequestMessage = new HttpRequestMessage();
if (!url.Contains("platform=android_tv_yst") && !url.Contains("platform=android"))
{
httpRequestMessage.Headers.TryAddWithoutValidation("Referer", "https://www.bilibili.com");
}
httpRequestMessage.Headers.TryAddWithoutValidation("User-Agent", "Mozilla/5.0");
httpRequestMessage.Headers.TryAddWithoutValidation("Cookie", Core.Config.COOKIE);
httpRequestMessage.RequestUri = new(url);
var response = (await AppHttpClient.SendAsync(httpRequestMessage, HttpCompletionOption.ResponseHeadersRead)).EnsureSuccessStatusCode();
long totalSizeBytes = response.Content.Headers.ContentLength ?? 0;
return(totalSizeBytes);
}
private static async Task RangeDownloadToTmpAsync(int id, string url, string tmpName, long fromPosition, long?toPosition, Action <int, long, long> onProgress, bool failOnRangeNotSupported = false)
{
DateTimeOffset?lastTime = File.Exists(tmpName) ? new FileInfo(tmpName).LastWriteTimeUtc : null;
using (var fileStream = new FileStream(tmpName, FileMode.Create))
{
fileStream.Seek(0, SeekOrigin.End);
var downloadedBytes = fromPosition + fileStream.Position;
using var httpRequestMessage = new HttpRequestMessage();
if (!url.Contains("platform=android_tv_yst") && !url.Contains("platform=android"))
{
httpRequestMessage.Headers.TryAddWithoutValidation("Referer", "https://www.bilibili.com");
}
httpRequestMessage.Headers.TryAddWithoutValidation("User-Agent", "Mozilla/5.0");
httpRequestMessage.Headers.TryAddWithoutValidation("Cookie", Core.Config.COOKIE);
httpRequestMessage.Headers.Range = new(downloadedBytes, toPosition);
httpRequestMessage.Headers.IfRange = lastTime != null ? new(lastTime.Value) : null;
httpRequestMessage.RequestUri = new(url);
using var response = (await AppHttpClient.SendAsync(httpRequestMessage, HttpCompletionOption.ResponseHeadersRead)).EnsureSuccessStatusCode();
if (response.StatusCode == HttpStatusCode.OK) // server doesn't response a partial content
{
if (failOnRangeNotSupported && (downloadedBytes > 0 || toPosition != null))
{
throw new NotSupportedException("Range request is not supported.");
}
downloadedBytes = 0;
fileStream.Seek(0, SeekOrigin.Begin);
}
using var stream = await response.Content.ReadAsStreamAsync();
var totalBytes = downloadedBytes + (response.Content.Headers.ContentLength ?? long.MaxValue - downloadedBytes);
const int blockSize = 1048576 / 4;
var buffer = new byte[blockSize];
while (downloadedBytes < totalBytes)
{
var recevied = await stream.ReadAsync(buffer);
if (recevied == 0)
{
break;
}
await fileStream.WriteAsync(buffer.AsMemory(0, recevied));
await fileStream.FlushAsync();
downloadedBytes += recevied;
onProgress(id, downloadedBytes - fromPosition, totalBytes);
}
if (response.Content.Headers.ContentLength != null && (response.Content.Headers.ContentLength != new FileInfo(tmpName).Length))
{
throw new Exception("Retry...");
}
}
}