public async Task <T> DownloadWithCancel <K, T>(string url, K postData, ApiKeyCombo apiKey, CancellationToken cancellationToken)
{
if (IsCancelled)
{
return(default(T));
}
using (HttpRequestMessage request = new HttpRequestMessage(
method: postData != null ? HttpMethod.Post : HttpMethod.Get,
requestUri: new Uri(url)))
{
if (postData != null)
{
request.Content = GeneratePostData(request, postData, apiKey);
cancellationToken.ThrowIfCancellationRequested();
}
if (apiKey != null)
{
request.Headers.Add("HashedKey", apiKey.HashedKey);
}
//if we'll be deserializing data, set accept type
if (typeof(K) != typeof(Stream) && typeof(K) != typeof(string))
{
request.Headers.Add("Accept", "application/json");
}
if (IsCancelled)
{
return(default(T));
}
using (HttpResponseMessage response = await _client.SendAsync(request))
{
cancellationToken.ThrowIfCancellationRequested();
if (IsCancelled)
{
return(default(T));
}
// If non-200 status code, throws exception
response.EnsureSuccessStatusCode();
Stream responseStream = await response.Content.ReadAsStreamAsync();
cancellationToken.ThrowIfCancellationRequested();
if (IsCancelled)
{
return(default(T));
}
return(readResponse <T>(responseStream));
}
}
}
public static async Task <T> Download <K, T>(string url, K postData, ApiKeyCombo apiKey, CancellationToken cancellationToken)
{
return(await new WebHelper().DownloadWithCancel <K, T>(url, postData, apiKey, cancellationToken));
}
/// <summary>
/// Supports streams and strings.
/// </summary>
/// <typeparam name="K"></typeparam>
/// <typeparam name="T"></typeparam>
/// <param name="url"></param>
/// <param name="postData"></param>
/// <param name="apiKey"></param>
/// <returns></returns>
public async Task <T> DownloadWithCancel <K, T>(string url, K postData, ApiKeyCombo apiKey)
{
return(await DownloadWithCancel <K, T>(url, postData, apiKey, CancellationToken.None));
}
private static StreamContent GeneratePostData <K>(HttpRequestMessage request, K postData, ApiKeyCombo apiKey)
{
Stream postStream = new MemoryStream();
string hashedData = null;
try
{
if (postData is Stream)
{
(postData as Stream).CopyTo(postStream);
postStream.Position = 0;
}
else
{
serialize(postStream, postData);
postStream.Position = 0;
}
if (apiKey != null)
{
// Turn it into bytes
byte[] bytes = new byte[postStream.Length];
postStream.Read(bytes, 0, bytes.Length);
postStream.Position = 0;
//hash the bytes, then hash ApiKey + Bytes
hashedData = EncryptionHelper.Sha1(bytes);
hashedData = EncryptionHelper.Sha256(apiKey.ApiKey + hashedData);
}
}
catch
{
postStream.Dispose();
throw;
}
StreamContent content = new StreamContent(postStream);
if (hashedData != null)
{
request.Headers.Add("HashedData", hashedData);
}
// If we serialized as JSON
if (!(postData is Stream))
{
content.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("application/json");
}
return(content);
}
