// Configure the application for OAuth based flow
PublicClientId = "self";
OAuthOptions = new OAuthAuthorizationServerOptions
{
    TokenEndpointPath = new PathString("/Token"),
    Provider = new ApplicationOAuthProvider(PublicClientId),
    AccessTokenExpireTimeSpan = TimeSpan.FromDays(14)
};

public void Configure(IApplicationBuilder app)
{
    app.UseOAuthBearerAuthentication(options =>
    {
        options.MetadataAddress = "meta";
    });

    // if this isn't here, we just get a 404
    app.Run(async context =>
    {
        await context.Response.WriteAsync("Hello World.");
    });
}

public void Configure(IApplicationBuilder app)
{
    app.UseOAuthAuthentication("What is this?", options =>
    {
        options.TokenEndpoint = "/token";
        options.AuthorizationEndpoint = "/oauth";
        options.ClientId = "What is this?";
        options.ClientSecret = "What is this?";
        options.SignInScheme = "What is this?";
        options.AutomaticAuthentication = true;
    });

    // if this isn't here, we just get a 404
    app.Run(async context =>
    {
        await context.Response.WriteAsync("Hello World.");
    });
}

// Add a new middleware validating access tokens issued by the server.
app.UseOAuthValidation();

// Add a new middleware issuing tokens.
app.UseOpenIdConnectServer(options =>
{
    options.TokenEndpointPath = "/connect/token";

    // Create your own `OpenIdConnectServerProvider` and override
    // ValidateTokenRequest/HandleTokenRequest to support the resource
    // owner password flow exactly like you did with the OAuth2 middleware.
    options.Provider = new AuthorizationProvider();
});

// Add a new middleware validating access tokens issued by the server.
services.AddAuthentication()
    .AddOAuthValidation()

    // Add a new middleware issuing tokens.
    .AddOpenIdConnectServer(options =>
    {
        options.TokenEndpointPath = "/connect/token";

        // Create your own `OpenIdConnectServerProvider` and override
        // ValidateTokenRequest/HandleTokenRequest to support the resource
        // owner password flow exactly like you did with the OAuth2 middleware.
        options.Provider = new AuthorizationProvider();
    });

POST http://localhost:50000/connect/token HTTP/1.1
User-Agent: Fiddler
Host: localhost:50000
Content-Length: 61
Content-Type: application/x-www-form-urlencoded

grant_type=password&username=my_username&password=my_password

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Length: 1687
Content-Type: application/json;charset=UTF-8
Expires: -1
X-Powered-By: ASP.NET
Date: Tue, 16 Jun 2015 01:24:42 GMT

{
  "access_token" : "eyJ0eXAiOi ... 5UVACg",
  "expires_in" : 3600,
  "token_type" : "bearer"
}

ResourceOwnerPasswordFlow
    Providers
        AuthorizationProvider.cs
    project.json
    Startup.cs

public partial class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddAuthentication();
    }
}

public partial class Startup
{
    public void Configure(IApplicationBuilder app)
    {
        JwtSecurityTokenHandler.DefaultInboundClaimTypeMap.Clear();
        JwtSecurityTokenHandler.DefaultOutboundClaimTypeMap.Clear();

        // Add a new middleware validating access tokens issued by the server.
        app.UseJwtBearerAuthentication(new JwtBearerOptions
        {
            AutomaticAuthenticate = true,
            AutomaticChallenge = true,
            Audience = "resource_server_1",
            Authority = "http://localhost:50000/",
            RequireHttpsMetadata = false
        });

        // Add a new middleware issuing tokens.
        app.UseOpenIdConnectServer(options =>
        {
            // Disable the HTTPS requirement.
            options.AllowInsecureHttp = true;

            // Enable the token endpoint.
            options.TokenEndpointPath = "/connect/token";

            options.Provider = new AuthorizationProvider();

            // Force the OpenID Connect server middleware to use JWT
            // instead of the default opaque/encrypted format.
            options.AccessTokenHandler = new JwtSecurityTokenHandler
            {
                InboundClaimTypeMap = new Dictionary<string, string>(),
                OutboundClaimTypeMap = new Dictionary<string, string>()
            };

            // Register an ephemeral signing key, used to protect the JWT tokens.
            // On production, you'd likely prefer using a signing certificate.
            options.SigningCredentials.AddEphemeralKey();
        });

        app.UseMvc();

        app.Run(async context =>
        {
            await context.Response.WriteAsync("Hello World!");
        });
    }
}

public sealed class AuthorizationProvider : OpenIdConnectServerProvider
{
    public override Task ValidateTokenRequest(ValidateTokenRequestContext context)
    {
        // Reject the token requests that don't use
        // grant_type=password or grant_type=refresh_token.
        if (!context.Request.IsPasswordGrantType() &&
            !context.Request.IsRefreshTokenGrantType())
        {
            context.Reject(
                error: OpenIdConnectConstants.Errors.UnsupportedGrantType,
                description: "Only grant_type=password and refresh_token " +
                             "requests are accepted by this server.");

            return Task.FromResult(0);
        }

        // Since there's only one application and since it's a public client
        // (i.e a client that cannot keep its credentials private), call Skip()
        // to inform the server that the request should be accepted without
        // enforcing client authentication.
        context.Skip();

        return Task.FromResult(0);
    }

    public override Task HandleTokenRequest(HandleTokenRequestContext context)
    {
        // Only handle grant_type=password token requests and let the
        // OpenID Connect server middleware handle the other grant types.
        if (context.Request.IsPasswordGrantType())
        {
            // Validate the credentials here (e.g using ASP.NET Core Identity).
            // You can call Reject() with an error code/description to reject
            // the request and return a message to the caller.

            var identity = new ClaimsIdentity(context.Options.AuthenticationScheme);
            identity.AddClaim(OpenIdConnectConstants.Claims.Subject, "[unique identifier]");

            // By default, claims are not serialized in the access and identity tokens.
            // Use the overload taking a "destinations" parameter to make sure
            // your claims are correctly serialized in the appropriate tokens.
            identity.AddClaim("urn:customclaim", "value",
                OpenIdConnectConstants.Destinations.AccessToken,
                OpenIdConnectConstants.Destinations.IdentityToken);

            var ticket = new AuthenticationTicket(
                new ClaimsPrincipal(identity),
                new AuthenticationProperties(),
                context.Options.AuthenticationScheme);

            // Call SetResources with the list of resource servers
            // the access token should be issued for.
            ticket.SetResources("resource_server_1");

            // Call SetScopes with the list of scopes you want to grant
            // (specify offline_access to issue a refresh token).
            ticket.SetScopes("profile", "offline_access");

            context.Validate(ticket);
        }

        return Task.FromResult(0);
    }
}

{
  "dependencies": {
    "AspNet.Security.OpenIdConnect.Server": "1.0.0",
    "Microsoft.AspNetCore.Authentication.JwtBearer": "1.0.0",
    "Microsoft.AspNetCore.Mvc": "1.0.0",
  }

  // other code omitted
}