How to get CDF API Key

If you want to stick with using the .NET SDK you can use the MSAL .NET library to acquire a valid token. Here’s a minimal C# example that reads the AAD and associated CDF variables from environment variables, initiate an interactive flow to acquire the token and uses the token to instantiate the CDF client. If you refer to the MSAL documentation, it’s straightforward to extend this example to other authentication flows.

string clientId = System.Environment.GetEnvironmentVariable("CLIENT_ID");
string tenantId = System.Environment.GetEnvironmentVariable("TENANT_ID");
string cluster = System.Environment.GetEnvironmentVariable("CDF_CLUSTER");
string project = System.Environment.GetEnvironmentVariable("CDF_PROJECT");

var scopes = new List<string>{ $"https://{cluster}.cognitedata.com/.default" };

var app = PublicClientApplicationBuilder
    .Create(clientId)
    .WithAuthority(AzureCloudInstance.AzurePublic, tenantId)
    .WithRedirectUri("http://local host")
    .Build();

AuthenticationResult result = await app.AcquireTokenInteractive(scopes).ExecuteAsync();
string accessToken = result.AccessToken;

var httpClient = new HttpClient();
var client = Client.Builder.Create(httpClient)
    .SetAppId("testNotebook")
    .AddHeader("Authorization", $"Bearer {accessToken}")
    .SetProject(project)
    .SetBaseUrl(new Uri($"https://{cluster}.cognitedata.com"))
    .Build();

Be mindful that I had to separate the words local and host, as this is a word that’s currently not allowed in the Cognite Hub.