private void OnNameResolved(NameResolutionResult dnsResult) {
if (dnsResult.NetworkInterface == null) {
if (filestream != null) {
filestream.Close();
}
ctx.Post(result => {
this.OnError(new ErrorEventArgs(new DownloadException("Network not available")));
}, null);
return;
}
HttpWebRequest request = (HttpWebRequest)WebRequest.CreateHttp(uri);
request.Method = "GET";
Logger.log("DownloadRequestHandler", "Downloading " + uri.AbsoluteUri + " asynchronously...");
request.BeginGetResponse(async callbackResult => {
DownloadFile df = (DownloadFile)callbackResult.AsyncState;
try {
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(callbackResult);
Logger.log("DownloadRequestHandler", "Status: " + (int)response.StatusCode + " " + response.StatusDescription);
if (response.Headers["Content-Length"] != null) {
Logger.log("DownloadRequestHandler", "Content length: " + response.Headers["Content-Length"]);
} else {
Logger.log("DownloadRequestHandler", "Content length: unknown");
}
Stream responseStream = response.GetResponseStream();
BinaryReader br = new BinaryReader(responseStream);
int responseBufferSize = 4096;
int responseBytesRead = 0;
int responseTotalBytesRead = 0;
byte[] responseBuffer = new byte[responseBufferSize];
while ((responseBytesRead = br.Read(responseBuffer, 0, responseBuffer.Length)) > 0) {
responseTotalBytesRead += responseBytesRead;
await filestream.WriteAsync(responseBuffer, 0, responseBuffer.Length);
}
filestream.Close();
Logger.log("DownloadRequestHandler", "Wrote " + responseTotalBytesRead + " bytes");
ctx.Post(result => {
df.OnComplete((DownloadFileEventArgs)result);
}, new DownloadFileEventArgs(filestream.Name, responseTotalBytesRead));
} catch (WebException ex) {
DownloadException de;
// check if we have an expired or self-signed cert
if (ex.Status == WebExceptionStatus.UnknownError) {
if (ex.Response.Headers.Count == 0 && uri.Scheme == "https") {
de = new DownloadException("Invalid SSL certificate, returning a 400 Bad Request");
} else {
de = new DownloadException("File not found, returning a 404");
}
} else {
de = new DownloadException("400 Bad Request: " + ex.Status.ToString());
}
if (filestream != null) {
filestream.Close();
}
ctx.Post(result => {
df.OnError(new ErrorEventArgs(de));
}, null);
Logger.log("DownloadRequestHandler", de.Message);
}
}, this);
}
private void OnNameResolved(NameResolutionResult dnsResult)
{
if (dnsResult.NetworkInterface == null)
{
if (filestream != null)
{
filestream.Close();
}
ctx.Post(result => {
this.OnError(new ErrorEventArgs(new DownloadException("Network not available")));
}, null);
return;
}
HttpWebRequest request = (HttpWebRequest)WebRequest.CreateHttp(uri);
request.Method = "GET";
Logger.log("DownloadRequestHandler", "Downloading " + uri.AbsoluteUri + " asynchronously...");
request.BeginGetResponse(async callbackResult => {
DownloadFile df = (DownloadFile)callbackResult.AsyncState;
try {
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(callbackResult);
Logger.log("DownloadRequestHandler", "Status: " + (int)response.StatusCode + " " + response.StatusDescription);
if (response.Headers["Content-Length"] != null)
{
Logger.log("DownloadRequestHandler", "Content length: " + response.Headers["Content-Length"]);
}
else
{
Logger.log("DownloadRequestHandler", "Content length: unknown");
}
Stream responseStream = response.GetResponseStream();
BinaryReader br = new BinaryReader(responseStream);
int responseTotalBytesRead = 0;
byte[] responseBuffer = br.ReadBytes(4096);
while (responseBuffer.Length > 0)
{
responseTotalBytesRead += responseBuffer.Length;
await filestream.WriteAsync(responseBuffer, 0, responseBuffer.Length);
responseBuffer = br.ReadBytes(4096);
}
filestream.Close();
Logger.log("DownloadRequestHandler", "Wrote " + responseTotalBytesRead + " bytes");
ctx.Post(result => {
df.OnComplete((DownloadFileEventArgs)result);
}, new DownloadFileEventArgs(filestream.Name, responseTotalBytesRead));
} catch (WebException ex) {
DownloadException de;
// check if we have an expired or self-signed cert
if (ex.Status == WebExceptionStatus.UnknownError)
{
if (ex.Response.Headers.Count == 0 && uri.Scheme == "https")
{
de = new DownloadException("Invalid SSL certificate, returning a 400 Bad Request");
}
else
{
de = new DownloadException("File not found, returning a 404");
}
}
else
{
de = new DownloadException("400 Bad Request: " + ex.Status.ToString());
}
if (filestream != null)
{
filestream.Close();
}
ctx.Post(result => {
df.OnError(new ErrorEventArgs(de));
}, null);
Logger.log("DownloadRequestHandler", de.Message);
}
}, this);
}
