private async System.Threading.Tasks.Task RenewAccessTokenAsync()
{
ServiceResponse sr = new ServiceResponse();
await HttpMethods.CallApiAuthAsync(sr, accessUri, grant, headers);
accessTokenInfo = Newtonsoft.Json.JsonConvert.DeserializeObject <AccessTokenInfo>(sr.ResponseString); // warning: thread unsafe
Log.WriteLine("Renewed token:" + accessTokenInfo.access_token);
}
private static List <Tuple <string, string> > MakeHeaders(Settings.Request request)
{
List <Tuple <string, string> > headers = new List <Tuple <string, string> >();
if (request == null || request.headers == null)
{
return(headers);
}
foreach (Settings.Header h in request.headers)
{
// TODO: need to expand request headers to include any header. Use Value instead of "Generic" or concrete name (Accept, ContentType)
switch (h.Name)
{
case "BearerAuthentication":
AccessTokenInfo accessTokenInfo = ImageAuth.PerformAuthenticationAsync(request, h).Result; // TODO: make this method async so don't have to do Wait?
headers.Add(new Tuple <string, string>("Authorization", "Bearer " + accessTokenInfo.access_token));
break;
case "BasicAuthentication":
string userpass = Convert.ToBase64String(System.Text.ASCIIEncoding.ASCII.GetBytes(string.Format("{0}:{1}", h.BasicAuthentication.username, h.BasicAuthentication.password).Replace('+', '-').Replace('/', '_')));
headers.Add(new Tuple <string, string>("Authorization", "Basic " + userpass));
break;
case "HoundifyAuthentication": // will be passed in but must skip, don't let default
break;
case "OcpApimSubscriptionKey":
headers.Add(new Tuple <string, string>("Ocp-Apim-Subscription-Key", h.OcpApimSubscriptionKey)); // needs rewrite. see above.
break;
default:
if (h.Generic == null)
{
throw new Exception("Header: Generic is null");
}
headers.Add(new Tuple <string, string>(h.Name, h.Generic));
break;
}
}
return(headers);
}
public async System.Threading.Tasks.Task <AccessTokenInfo> PerformAuthenticationAsync(Settings.Request request, Settings.Header h)
{
Settings.BearerAuthentication bearer = h.BearerAuthentication;
if (request == null || h == null)
{
throw new Exception("request/h is null");
}
if (h.OcpApimSubscriptionKey != null) // ClarifAi, OcpApimSubscriptionKey
{
Settings.BearerAuthentication BearerAuth = h.BearerAuthentication;
Uri accessUri = new Uri(BearerAuth.uri);
// todo: this only works for Microsoft APIs. Make code conditional on Microsoft? Break out as separate API to be execute first? Change headers in json file?
headers = new System.Collections.Generic.List <Tuple <string, string> >()
{
new Tuple <string, string>("Content-Type", "application/x-www-form-urlencoded"),
new Tuple <string, string>("Ocp-Apim-Subscription-Key", h.OcpApimSubscriptionKey) // TODO: need dictionary lookup instead of hardcoding
};
ServiceResponse sr = new ServiceResponse();
HttpMethods.CallApiAuthAsync(sr, accessUri, "", headers).Wait();
accessTokenInfo = new AccessTokenInfo();
accessTokenInfo.access_token = sr.ResponseString;
}
else if (h.BearerAuthentication.clientID != null && h.BearerAuthentication.clientSecret != null) // Microsoft
{
string clientID = bearer.clientID;
string clientSecret = bearer.clientSecret;
//string scope = bearer.scope;
this.request = request;
System.Collections.Generic.List <Tuple <string, string> > grantSubstitutes = new System.Collections.Generic.List <Tuple <string, string> >()
{
new Tuple <string, string>("{clientID}", System.Web.HttpUtility.UrlEncode(clientID)),
new Tuple <string, string>("{clientSecret}", System.Web.HttpUtility.UrlEncode(clientSecret)),
//new Tuple<string, string>("{scope}", System.Web.HttpUtility.UrlEncode(scope)),
};
grant = bearer.grant;
foreach (Tuple <string, string> r in grantSubstitutes)
{
grant = grant.Replace(r.Item1, r.Item2);
}
accessUri = new Uri(bearer.uri);
headers = new System.Collections.Generic.List <Tuple <string, string> >()
{
new Tuple <string, string>("Content-Type", "application/x-www-form-urlencoded")
};
ServiceResponse sr = new ServiceResponse();
await HttpMethods.CallApiAuthAsync(sr, accessUri, grant, headers);
accessTokenInfo = Newtonsoft.Json.JsonConvert.DeserializeObject <AccessTokenInfo>(sr.ResponseString);
// renew the token every specfied minutes
accessTokenRenewer = new System.Threading.Timer(new System.Threading.TimerCallback(OnTokenExpiredCallbackAsync),
this,
TimeSpan.FromMinutes(RefreshTokenDuration),
TimeSpan.FromMilliseconds(-1));
}
else if (h.BearerAuthentication.bearer != null) // Wit.Ai
{
accessTokenInfo.access_token = h.BearerAuthentication.bearer;
}
else
{
throw new Exception("Unknown Bearer Authentication");
}
return(accessTokenInfo);
}
