Retrieving client name in IdentityServer4 and ASP.NET Core - asp.net-core

Question

The dbo.Clients table in the IdentityServer database contains both ClientId and ClientName, however requesting a client credentials token doesn't include the client name in the token.
Is there a way to either retrieve client information from IdentityServer given the client id, or request that the client name be added to the token?

Answer 1

You can add them dynamically using a custom token request validator :
public class ClaimClientsUpdated : ICustomTokenRequestValidator
{
public Task ValidateAsync(CustomTokenRequestValidationContext context)
{
context.Result.ValidatedRequest.Client.AlwaysSendClientClaims = true;
context.Result.ValidatedRequest.ClientClaims.Add(new Claim("name", context.Result.ValidatedRequest.Client.ClientName));
return Task.FromResult(0);
}
}
Register in DI :
services.AddTransient<ICustomTokenRequestValidator, ClaimClientsUpdated>();
It will add prefix "client_" to custom claims , so claim will be "client_name": "value" in access token .

Answer 2

You can add information about the client in general by adding claims to the ClientClaims table. E.g. Type = Name, Value = MyCustomName
Which is added as claim (assuming prefix client_):
"client_Name": "MyCustomName"
This will allow you to add information about the client without having to add or change code.
The drawback for the client name is that you'll have to add a claim with redundant information, as Clients.ClientName is not the source. The advantage is that it's configuration only.