Autofac ASP.NET Core Extensions

Installation

NuGet

PM> Install-Package Autofac.AspNetCore.Extensions

.Net CLI

> dotnet add package Autofac.AspNetCore.Extensions

Nuget Packages

• Autofac.Extensions.DependencyInjection
• Autofac.Multitenant
• Autofac.AspNetCore.Multitenant

Single Tenant Usage ASP.NET Core 2.2

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseAutofac()
.UseStartup<Startup>();

Single Tenant Usage ASP.NET Core 3.0

public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
	webBuilder
	.UseAutofac()
	.UseStartup<Startup>();
});

Multitenant Usage ASP.NET Core 2.2

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.ConfigureServices(services =>
{
	services.AddHttpContextAccessor();
	services.AddScoped<ITenantIdentificationStrategy, SubdomainIdentificationStrategy>();
})
.UseAutofacMultitenant()
.UseStartup<Startup>();

public class SubdomainIdentificationStrategy : ITenantIdentificationStrategy
{
	private readonly IHttpContextAccessor _httpContextAccessor;
	public SubdomainIdentificationStrategy(IHttpContextAccessor httpContextAccessor)
	{
		_httpContextAccessor = httpContextAccessor;
	}

	public bool TryIdentifyTenant(out object tenantId)
	{
		var context = _httpContextAccessor.HttpContext;
		if(context == null)
		{
			tenantId = null;
			return false;
		}

		tenantId = GetSubDomain(context);
		return tenantId != null;
	}

	private string GetSubDomain(HttpContext httpContext)
	{
		var subDomain = string.Empty;

		var host = httpContext.Request.Host.Host;

		if (!string.IsNullOrWhiteSpace(host))
		{
			subDomain = host.Split('.')[0];
		}

		return subDomain.Trim().ToLower();
	}
}

Multitenant Usage ASP.NET Core 3.0

public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
	webBuilder
	.ConfigureServices(services =>
	{
		services.AddHttpContextAccessor();
		services.AddScoped<ITenantIdentificationStrategy, SubdomainIdentificationStrategy>();
	})
	.UseAutofacMultitenant()
	.UseStartup<Startup>();
});

public class SubdomainIdentificationStrategy : ITenantIdentificationStrategy
{
	private readonly IHttpContextAccessor _httpContextAccessor;
	public SubdomainIdentificationStrategy(IHttpContextAccessor httpContextAccessor)
	{
		_httpContextAccessor = httpContextAccessor;
	}

	public bool TryIdentifyTenant(out object tenantId)
	{
		var context = _httpContextAccessor.HttpContext;
		if(context == null)
		{
			tenantId = null;
			return false;
		}

		tenantId = GetSubDomain(context);
		return tenantId != null;
	}

	private string GetSubDomain(HttpContext httpContext)
	{
		var subDomain = string.Empty;

		var host = httpContext.Request.Host.Host;

		if (!string.IsNullOrWhiteSpace(host))
		{
			subDomain = host.Split('.')[0];
		}

		return subDomain.Trim().ToLower();
	}
}

Authors

• Dave Ikin - davidikin45

License

This project is licensed under the MIT License