private static HttpRequestMessage CreateRequest(UriInfo uriInfo, Uri uri)
{
return(new HttpRequestMessage
{
Method = uriInfo.UseHead ? HttpMethod.Head : HttpMethod.Get,
RequestUri = uri
});
}
public UriInfo(UriInfo copyFrom)
{
_followRedirects = copyFrom._followRedirects;
_ignoreSslErrors = copyFrom._ignoreSslErrors;
_useHead = copyFrom._useHead;
_uri = new Uri(copyFrom._uri.OriginalString);
_enabled = copyFrom.Enabled;
}
private async Task <HttpStatusCode> GetResponseCode(UriInfo uriInfo)
{
int redirectCount;
bool done;
HttpRequestMessage request;
HttpStatusCode statusCode;
redirectCount = 0;
done = false;
request = DownDetectorClient.CreateRequest(uriInfo, uriInfo.Uri);
do
{
HttpResponseMessage response;
response = await _httpClient.SendAsync(request).ConfigureAwait(false);
statusCode = response.StatusCode;
if (DownDetectorClient.IsRedirectResponse(statusCode) && uriInfo.FollowRedirects)
{
redirectCount++;
if (redirectCount > _settings.MaximumRedirects)
{
done = true;
}
else
{
Uri redirectUri;
redirectUri = response.Headers.Location;
if (!redirectUri.IsAbsoluteUri)
{
redirectUri = new Uri(request.RequestUri, redirectUri);
}
request = DownDetectorClient.CreateRequest(uriInfo, redirectUri);
}
}
else
{
done = true;
}
} while (!done);
return(statusCode);
}
public async Task CheckUri(UriInfo uriInfo)
{
Uri uri;
UriEventArgs args;
UriStatus newStatus;
Exception error;
HttpStatusCode httpStatus;
uri = uriInfo.Uri;
if (!_settings.Statuses.TryGetValue(uri, out UriStatusInfo status))
{
status = new UriStatusInfo
{
LastChange = DateTimeOffset.UtcNow,
Status = UriStatus.Unknown,
Uri = uri
};
_settings.Statuses.Add(status);
}
args = new UriEventArgs(uri);
this.OnUriChecking(args);
(newStatus, httpStatus, error) = await this.GetUriStatus(uriInfo).ConfigureAwait(false);
if (error != null)
{
this.OnUriException(new UriExceptionEventArgs(uri, error));
}
this.UpdateStatus(status, httpStatus, newStatus);
this.OnUriChecked(args);
}
private async Task <Tuple <UriStatus, HttpStatusCode, Exception> > GetUriStatus(UriInfo uriInfo)
{
UriStatus newStatus;
Exception error;
HttpStatusCode httpStatus;
_sslPolicyErrors = SslPolicyErrors.None;
try
{
httpStatus = await this.GetResponseCode(uriInfo).ConfigureAwait(false);
newStatus = httpStatus == HttpStatusCode.OK
? UriStatus.Online
: UriStatus.Unstable;
if (newStatus == UriStatus.Online && _sslPolicyErrors != SslPolicyErrors.None)
{
newStatus = uriInfo.IgnoreSslErrors
? UriStatus.InvalidCertificate
: UriStatus.Unstable;
}
error = null;
}
catch (Exception ex)
{
newStatus = UriStatus.Unstable;
httpStatus = 0;
error = ex;
}
return(Tuple.Create(newStatus, httpStatus, error));
}
public bool TryGetValue(UriInfo uriInfo, out UriStatusInfo value)
{
return(this.TryGetValue(uriInfo.Uri, out value));
}
