mustaddon / singleapi

.NET Single/generic webapi endpoint for mediators

SingleApi

Single/generic WebApi endpoint for mediators

Features

• Ready for mediators
• Generics support
• In/out file streams

Example 1: SingleApi with MediatR

.NET CLI

dotnet new web --name "SingleApiExample"
cd SingleApiExample
dotnet add package SingleApi
dotnet add package MediatR

Change Program.cs

using MediatR;
using System.Reflection;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddMediatR(cfg => cfg.RegisterServicesFromAssembly(Assembly.GetExecutingAssembly()));

var app = builder.Build();

app.MapSingleApi("sapi", 
    // invoke the MediatR
    x => x.ServiceProvider.GetRequiredService<IMediator>().Send(x.Data, x.CancellationToken),
    // assemblies for type resolving
    Assembly.GetExecutingAssembly()); 

app.Run();

Example project...

Example 2: Request/Response

Request

GET /sapi/Ping?data={"Message":"TEST"}

or

POST /sapi/Ping
{"Message":"TEST"}

Response

{"Message":"TEST PONG"}

Example 3: Generics requests

app.MapSingleApi("sapi", 
    // for simplicity, return the received data
    x => Task.FromResult(x.Data), 
    // existing generic types will suffice for this example
    typeof(List<>).Assembly, typeof(int).Assembly); 

Request #1: Equivalent of List<String>

POST /sapi/List(String)
["text1","text2","text3"]

Request #2: Equivalent of Dictionary<string,int?[]>

POST /sapi/Dictionary(String-Array(Nullable(Int32)))
{"key1":[555,null,777]}

Example 4: .NET client

.NET CLI

dotnet new console --name "SapiClientExample"
cd SapiClientExample
dotnet add package SingleApi.Client

Program.cs:

using SingleApi.Client;

// create client
using var sapi = new SapiClient("https://localhost:7263/sapi");

// send request
var response = await sapi.Send(new Ping { Message = "TEST" });

Console.WriteLine(response?.Message);

Console output:

TEST PONG

Example project...

Example 5: File upload

Create RequestHandler

using MediatR;
using MetaFile;
namespace Example;

public class FileUpload : StreamFile, IRequest<string>
{

}

public class FileUploadHandler : IRequestHandler<FileUpload, string>
{
    public async Task<string> Handle(FileUpload request, CancellationToken cancellationToken)
    {
        var filePath = Path.GetFullPath(request.Name);
        using var fileStream = File.Create(filePath);
        await request.Content.CopyToAsync(fileStream, cancellationToken);
        return filePath;
    }
}

Sending a file in JavaScript

let file = document.getElementById('my-input').files[0];

let response = await fetch('/sapi/FileUpload', {
    method: 'POST',
    headers: {
        'content-type': file.type || 'application/octet-stream',
        'content-disposition': `attachment; filename*=utf-8''${encodeURIComponent(file.name)}`,
    },
    body: file,
});

console.log('result:', await response.json());

Example project...