HelseID.Library.ClientCredentials 1.1.3

HelseId.Library

The easiest way to integrate with HelseID! This library conforms to the requirements from the HelseID security profile for the client credentials grant (also known as machine-to-machine).

To get started with HelseID

See the docs on https://selvbetjening.nhn.no/docs

How to use the library:

You start by installing the NuGet package HelseID.Library.ClientCredentials.

The simplest setting is where the configuration is hard-coded:

// This comes from the .NET Generic Host (https://learn.microsoft.com/en-us/dotnet/core/extensions/generic-host?tabs=appbuilder)

HostApplicationBuilder builder = Host.CreateApplicationBuilder(args);
    
var helseIdConfiguration = new HelseIdConfiguration
{
    ClientId = "7e3816ca-7d11-41cd-be55-fb9e8954e058",
    Scope = "nhn:hgd-persontjenesten-api/restricted-access nhn:selvbetjening/client",
    IssuerUri = "https://helseid-sts.test.nhn.no",
};

builder.Services
    .AddHelseIdClientCredentials(helseIdConfiguration)
    .AddJwkForClientAuthentication(YOUR_PRIVATE_KEY_HERE);

var host = builder.Build();
host.Run();
// The service is now configured

Later on you will need to use an instance of the IHelseIdClientCredentialsFlow to retrieve an Access token response:

// This is constructed by the service locator
IHelseIdClientCredentialsFlow helseIdClientCredentialsFlow;

...

var tokenResponse = await helseIdClientCredentialsFlow.GetTokenResponseAsync();

// If the token response is successful, you will get an AccessTokenResponse object:
if (tokenResponse.IsSuccessful(out var accessTokenResponse))
{
    ...
}
else
{
    // If the token response failed, you can inspect the error response from the TokenErrorResponse object:
    var errorResponse = tokenResponse.AsError();
    Console.WriteLine(errorResponse.Error + " " + errorResponse.ErrorDescription);
    ...
}

If you have a multi-tenant client, you will probably need to setup organization numbers; see the document Performing token requests for this scenario.

To retrieve a DPoP Proof you can use the IDPoPProofCreatorForApiRequests:

...
// This is constructed by the service locator
IDPoPProofCreatorForApiRequests dPoPProofCreator;

var url = "URL TO THE HTTP ENDPOINT";
var dPoPProof = await dPoPProofCreator.CreateDPoPProofForApiRequest(HttpMethod.Get, url, accessTokenResponse);
...

Finally, to make a request to an API you can do the following: using our SetDPoPTokenAndProof extension method to set both Access Token and DPoP proof on the HTTP request:

...
var apiRequest = new HttpRequestMessage(HttpMethod.Get, url);
apiRequest.SetDPoPTokenAndProof(accessTokenResponse, dPoPProof);

var response = await httpClient.SendAsync(apiRequest);
...

Read more here:

• Configuration
• Handling of secrets
• Performing token requests
• Using DPoP
• Advanced setup
• Automatic key rotation