void Get(string[] args)
{
// new http get request with conntionID, uri, and optional "auto-convert response from UTF8 to UTF16" arguments
try
{
int connectionID = Int32.Parse(args[2]);
// Un-base64 the uri into a byte array, then convert it from Unicode to a string
string uriDecoded = Encoding.Unicode.GetString(Convert.FromBase64String(args[3]));
Uri webUri;
try
{
webUri = new Uri(uriDecoded);
}
catch (UriFormatException e)
{
Console.WriteLine("URI incorrectly formatted: " + e.Message);
midiManager.SendWebRequestFailedResponse(connectionID, WEB_REQUEST_FAILED_ERROR_CODE);
return;
}
bool autoConvertResponse = false;
if (args.Length > 4)
{
autoConvertResponse = args[4] == "UTF16";
}
Console.WriteLine("Performing web request (" + connectionID + "): " + uriDecoded);
webManager.GetWebRequest(connectionID, webUri, autoConvertResponse);
}
catch (Exception e)
{
Console.WriteLine("Error parsing web request: " + e.Message);
}
}
public async void GetWebRequest(int connectionID, Uri webUri, bool autoConvertResponse)
{
// Block all non-internet IP address
if (HostnameIsPrivateIPAddress(webUri))
{
midiManager.SendWebRequestFailedResponse(connectionID, WEB_REQUEST_FAILED_ERROR_CODE);
return;
}
// Block all non http/https traffic
if (webUri.Scheme != Uri.UriSchemeHttp && webUri.Scheme != Uri.UriSchemeHttps)
{
Console.WriteLine("Error: World attempted to open unsupported URI: " + webUri.Scheme);
midiManager.SendWebRequestFailedResponse(connectionID, WEB_REQUEST_FAILED_ERROR_CODE);
return;
}
// Block all rate limited domain+path combos
// Temporarily changed to include entire host
var hostAndPath = new HostnameAndPath(webUri.Host, "");
if (rateLimitedURIs.ContainsKey(hostAndPath))
{
if (DateTime.Now < rateLimitedURIs[hostAndPath])
{
Console.WriteLine("ERROR: Could not make web request, currently rate limited.");
midiManager.SendWebRequestFailedResponse(connectionID, RATE_LIMITED_ERROR_CODE);
return;
}
else
{
rateLimitedURIs.Remove(hostAndPath);
}
}
HttpResponseMessage response;
try
{
response = await httpClient.GetAsync(webUri, ctSource.Token);
}
catch (Exception e)
{
Console.WriteLine("HTTP request failed: " + e.Message);
rateLimitedURIs.Add(hostAndPath, DateTime.Now.AddSeconds(RATE_LIMIT_TIMEOUT_SECONDS));
midiManager.SendWebRequestFailedResponse(connectionID, WEB_REQUEST_FAILED_ERROR_CODE);
return;
}
// Rate limit unsuccessful requests
if (!response.IsSuccessStatusCode)
{
rateLimitedURIs.Add(hostAndPath, DateTime.Now.AddSeconds(RATE_LIMIT_TIMEOUT_SECONDS));
}
Console.WriteLine("Received web response (" + connectionID + "): " + webUri.AbsoluteUri);
AddWebResponse(response, connectionID, autoConvertResponse);
}