Custom Implementation of IClientStore

Question

We are using EntityFramework Core with Identity Server4 to store configuration data. Do we need custom implementation of IClientStore(i.e FindClientByIdAsync) interface to fetch client from database?

 public class CustomClientStore : IClientStore
{
    const string connectionString = @"Data Source=(LocalDb)\MSSQLLocalDB;database=IdentityServer4.Quickstart.EntityFramework-2.0.0;trusted_connection=yes;";
    public Task<Client> FindClientByIdAsync(string clientId)
    {
        var options = new DbContextOptionsBuilder<ConfigurationDbContext>();

        options.UseSqlServer(connectionString);

        var _context = new ConfigurationDbContext(options.Options, new ConfigurationStoreOptions());

        var result = _context.Clients.Where(x => x.ClientId == clientId).FirstOrDefault();

        return Task.FromResult(result.ToModel());
    }
}

Answer 1

No need to roll your own. An Entity Framework Core implementation of IClientStore already exists in the IdentityServer4.EntityFramework package.

This can be registered like so:

services.AddIdentityServer()
  //.AddInMemoryClients(new List<Client>())
  .AddConfigurationStore(options => options.ConfigureDbContext = builder => 
      builder.UseSqlServer(connectionString));

See example repository for full code example: https://github.com/IdentityServer/IdentityServer4.EntityFramework/tree/dev/src/Host