Make Facebook user fields configurable via custom Provider Store

[bpred754]

Currently, the default Facebook fields "gender" and "birthday" require Facebook Review Approval. Since this may not be necessary for some apps, let's make this configurable via a custom Provider Store.

Example:

MyCustomProviders.cs

public static class MyCustomProviders
{
    public static IEnumerable<ExternalTokenExchangeProvider> GetProviders()
    {
        return new List<ExternalTokenExchangeProvider>
        {
            new ExternalTokenExchangeProvider
            {
                Id = 1,
                Fields = "id,email,name",
                Name = "Facebook",
                UserInfoEndpoint = "https://graph.facebook.com/v2.8/me"
            }
        };
    }
}

MyCustomProviderStore.cs

public class MyCustomProviderStore : DefaultTokenExchangeProviderStore
{
    public MyCustomProviderStore () : base(MyCustomProviders.GetProviders()) {}
}

Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.buildIdentityServer()
        .AddCustomTokenExchangeProviderStore<MyCustomProviderStore>();
}

[bpred754]

@waqaskhan540, would you mind updating the nuget package as well? Thanks!

[waqaskhan540]

@bpred754 Yes sure I will and will let you know. Thanks!

[bpred754]

@waqaskhan540 have you been able to push it yet? I am having to use a custom NuGet feed in the meantime.

[bpred754]

@waqaskhan540 any update on this?

[waqaskhan540]

@bpred754 thanks for reminding me and sorry for the late reply, I have just uploaded the updated package to nuget with version 1.0.1, it will be available for download in an hour.

https://www.nuget.org/packages/IdentityServer.External.TokenExchange/1.0.1

[bpred754]

Awesome, thanks @waqaskhan540!