public async Task <PredictResults> Predict(string endPointUrl, Stream imageStream)
{
var bearer = await _credential.GetAccessTokenForRequestAsync();
imageStream.Position = 0;
var requestBody = new
{
payload = new
{
image = new
{
imageBytes = Utils.StreamToBase64(imageStream)
}
}
};
using (var client = new HttpClient())
{
var contentStr = JsonConvert.SerializeObject(requestBody);
var content = new StringContent(contentStr, Encoding.UTF8, "application/json");
client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", bearer);
var result = await client.PostAsync(endPointUrl, content);
if (!result.IsSuccessStatusCode)
{
throw new Exception($"{result.StatusCode} - {result.ReasonPhrase}");
}
var strResult = await result.Content.ReadAsStringAsync();
return(JsonConvert.DeserializeObject <PredictResults>(strResult));
}
}
public async Task AccessTokenCredential()
{
const string fakeAccessToken = "FakeAccessToken";
// Create an access-token credential, and check the access token is correct.
ICredential cred = GoogleCredential.FromAccessToken(fakeAccessToken);
Assert.Equal(fakeAccessToken, await cred.GetAccessTokenForRequestAsync());
// Check the auth header is added correctly to an HTTP request.
var httpHandler = new FakeHandler();
var httpClient = new Http.ConfigurableHttpClient(new Http.ConfigurableMessageHandler(httpHandler));
cred.Initialize(httpClient);
await httpClient.GetAsync("http://localhost/TestRequest");
Assert.Equal("Bearer", httpHandler.RequestHeaders.Authorization.Scheme);
Assert.Equal(fakeAccessToken, httpHandler.RequestHeaders.Authorization.Parameter);
}