OpenRiaServices.Hosting.AspNetCore 1.0.0

This software will allow existing applications written for OpenRiaServices or WCF RIA Services to run on net6 and kestrel, making them future proof and improving their performance.

Hopefully it will allow you as a consumer to make large savings in development time, weeks or even man years, by not having to rewrite your application as well as allowing rapid development.

The software is provided free of charge, but I urge you to use some of the money saved by using this software to support Ukraine The civilian suffering due to the Russian invasion, the attacks on hospitals and other war crimes are enormous.

TERM OF USE

By using this project or its source code, for any purpose and in any shape or form, you grant your agreement to all the following statements:

• You condemn Russia and its military aggression against Ukraine
• You recognize that Russia is an occupant that unlawfully invaded a sovereign state
• You support Ukraine's territorial integrity, including its claims over temporarily occupied territories of Crimea and Donbas
• You do not support the Russian invasion or contribute to its propaganda'

This excludes usage by the Russian state, Russian state-owned companies, Russian education who spread propaganda instead of truth, anyone who work with the filtration camps, or finance the war by importing Russian oil or gas.

• You allow anonymized telemetry to collected and sent during the preview releases to gather feedback about usage

Production Ready - "preview"

The package is production ready, but does not yet contain all features planened for 1.0. Please look at TODO in project's folder for more details.

Public API will change before 1.0.0 release

There is no documentation yet, please see AspNetCoreWebsite project in repository for usage.

• For a sample see WpfCore_AspNetCore in Samples repository

Getting Started

1. Create a new dotnet 6 web application dotnet new web or similar

2. Add a reference to OpenRiaServices.Hosting.AspNetCore dotnet add package OpenRiaServices.Hosting.AspNetCore

3. Add a reference to OpenRiaServices.Server

4. Add one or more domainservices

[EnableClientAccess]
public class CityDomainService : DomainService
{
    /* .....  */
}

For more documentation see https://openriaservices.gitbook.io/openriaservices/ee707348/ee707373 or samples https://github.com/OpenRIAServices/OpenRiaServices/blob/086ea8c8fcb115000749be6b2b01cd43bb95bf80/docs/gg602754.md#add-the-poco-class

5. Setup hosting integration

Minimal program:

using OpenRiaServices.Hosting.AspNetCore;

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddOpenRiaServices();
builder.Services.AddTransient<CityDomainService>();


var app = builder.Build();
app.MapOpenRiaServices(builder =>
{
    builder.AddDomainService<CityDomainService>();
});


app.Run();

Asp.Net Core integration

Since 0.4.0 any attivbute applied to Invoke/Query are added to the corresponding AspNetCore-Endpoint allowing the use of any AspNetCore endpoint middleware (not MVC specific filters, they must work with "minimal api's").

This means you can use standard aspnetcore Authentication and Authorization to validate most requests (but NOT indivudual Insert,Update,Delete methods, you can apply atttributes to your DomainService class for those). The validation will happen before the DomainService is even created, making them more powerful than built in attributes.

You can still (and probably should) use the OpenRiaServices specific attributes such as [RequiresAuthentication] or your own Authorization attributes Simple authorization, which works on all methods.

AspNetCore Authentication and Authorization

You can use standard aspnetcore Authentication and Authorization to validate most requests (but NOT indivudual Insert, Update, Delete methods, you can apply atttributes to your DomainService class for those). The validation will happen before the DomainService is even created, making them more powerful than built in attributes.

The AspNetCore Sample shows how cookie based login similar to ASP.NET Membership provider can be handled. The change was added in #16: Add AspNetCore AuthenticationService You will need to tweak it so it validates credentials, assign correct Claims (Roles) to users and fits your choosen scheme for authentication.

Authentication: Client setup

For the client, you need to ensure that all HttpClients share the same CookieContainer and that the it is set to use to cookies (https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclienthandler.usecookies?view=net-7.0#system-net-http-httpclienthandler-usecookies)

Authentication: Asp.Net Core Setup Authentication and Authorization setup

In Program.cs the following code is needed

Service registrations, adds cookie based authentication and enable Authorization

// Additional dependencies for cookie based AuthenticationService
builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
    .AddCookie();
builder.Services.AddHttpContextAccessor();

builder.Services.AddAuthorization();

After the "application has been built" and the middleware is configured you should add Authentication (and Authorization if used). They should be added before OpenRiaServices

// Add authentication
app.UseAuthentication();
app.UseAuthorization();

// Enable OpenRiaServices
app.MapOpenRiaServices(....

Authorization: Protecting DomainServices using Authorization middleware

A good idea is to protect your DomainServices, all of them or individual, by requiring authorization. The Authorization middleware should run before the DomainService is created so you will avoid any cost with creating the DomainService and it's dependencies, providing a much better protection against DOS.

IMPORANT: error message on the client will be different and not as user friendly as if the [RequiresAuthentication] attribute is used. You might want to consider changing the HTTP status code to match 401 or similar instead of 404 (when it tries to redirect to missing "/Account/Login" endpoint) Note: If you need to selectivly only require authentication for some Submit operations (Insert, Update, Delete or Entity Action) then remember to use [RequiresAuthentication]

Require request to all DomainServices be authorized using default authorization policy:

app.MapOpenRiaServices(builder =>
{
    builder.AddDomainService<SampleDomainService>();
    builder.AddDomainService<MyAuthenticationService>();
}).RequireAuthorization();

You can also control the setting per DomainService using code

app.MapOpenRiaServices(builder =>
{
    builder.AddDomainService<SampleDomainService>()
        .RequireAuthorization();
});

You can also control the setting per DomainService using attributes

[Authorize]
public class MyAuthenticationService : DomainService, IAuthentication<MyUser>
{
    [AllowAnonymous]
    public MyUser GetUser() {...}

Output Cache Integration

Sample showing how to integrate the OutputCache middleware WARNING: Se caching documentation and ensure that any usage of output cache is not sent to the wrong user.

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddOpenRiaServices();
builder.Services.AddOutputCache(options =>
{
    options.AddBasePolicy(builder => builder.NoCache());
});

builder.Services.AddTransient<CacheTestDomainService>();

var app = builder.Build();

app.UseOutputCache();


[EnableClientAccess]
public class CacheTestDomainService : DomainService
{
    [Invoke(HasSideEffects = false)]
    public string NoCache()
        => DateTime.Now.ToString();

    [Invoke(HasSideEffects = false)]
    [Microsoft.AspNetCore.OutputCaching.OutputCache(Duration = 5)]
    public string OutputCache()
        => DateTime.Now.ToString();
}