DefaultTenantResolveContributor instead of ConfigurationTenantResolveContributor

docs/en/framework/architecture/multi-tenancy/index.md

@@ -206,6 +206,7 @@ The following resolvers are provided and configured by default;
 - `RouteTenantResolveContributor`: Tries to find current tenant id from route (URL path). The variable name is `__tenant` by default. If you defined a route with this variable, then it can determine the current tenant from the route.
 - `HeaderTenantResolveContributor`: Tries to find current tenant id from HTTP headers. The header name is `__tenant` by default.
 - `CookieTenantResolveContributor`: Tries to find current tenant id from cookie values. The cookie name is `__tenant` by default.
+- `DefaultTenantResolveContributor`: Resolves a fallback tenant from configuration if none of the above resolvers succeed. This resolver is automatically registered and runs last by default. It should be configured via `AbpAspNetCoreMultiTenancyOptions.DefaultTenant`, as described in the `Default Tenant Resolver` section below.
 
 ###### Problems with the NGINX
 
@@ -346,41 +347,34 @@ context.Services
 
 ```
 
-##### ConfigurationTenantResolveContributor
+##### Default Tenant Resolver
 
-This tenant resolver reads the tenant identifier from application configuration `appsettings.json`.
+In some cases, especially in **development environments**, resolving a tenant based on domain may not be practical (e.g., due to use of `localhost`). In such cases, a default fallback tenant can be configured using `AbpAspNetCoreMultiTenancyOptions.DefaultTenant`.
 
-It is intended primarily for **development or testing environments** where setting the tenant manually is useful (e.g., without headers, route parameters, or query strings).
+This fallback is resolved by the `DefaultTenantResolveContributor`, which attempts to set a default tenant if none of the other resolvers succeed. This contributor is automatically added at the **end** of the tenant resolver list.
 
-###### **Configuration Example:**
+###### Configuration
+
+Set the default tenant value via code or `appsettings.json`:
 
 ```json
 {
-    "MultiTenancy": {
-        "Tenant": "my-tenant-name"
-    }
+  "MultiTenancy": {
+    "DefaultTenant": "acme" // can be tenant name or ID
+  }
 }
 ```
 
-The value can be either the **tenant name** or the **tenant ID**.
-
-###### **How to Use:**
-
-This resolver is not registered by default. You can add it manually in your module's `ConfigureServices`:
+**Startup Configuration:**
 
 ```csharp
-var env = context.Services.GetHostingEnvironment();
-if (env.IsDevelopment()) // Optional but preferred: only register in development
+Configure<AbpAspNetCoreMultiTenancyOptions>(options =>
 {
-    Configure<AbpTenantResolveOptions>(options =>
-    {
-        options.AddConfigurationTenantResolver();
-    });
-}
+    options.DefaultTenant = configuration["MultiTenancy:DefaultTenant"];
+});
 ```
 
-> Recommended to limit this resolver to development to avoid static tenant resolution in production.
-
+> The `DefaultTenantResolveContributor` must be configured via options as shown above. It is included by default and is evaluated only if all other resolvers fail.
 
 ##### Custom Tenant Resolvers
 

framework/src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/AbpAspNetCoreMultiTenancyModule.cs

@@ -17,6 +17,7 @@ public class AbpAspNetCoreMultiTenancyModule : AbpModule
             options.TenantResolvers.Add(new RouteTenantResolveContributor());
             options.TenantResolvers.Add(new HeaderTenantResolveContributor());
             options.TenantResolvers.Add(new CookieTenantResolveContributor());
+            options.TenantResolvers.Add(new DefaultTenantResolveContributor());
         });
     }
 }

framework/src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/AbpAspNetCoreMultiTenancyOptions.cs

@@ -26,6 +26,12 @@ namespace Volo.Abp.AspNetCore.MultiTenancy;
 
 public class AbpAspNetCoreMultiTenancyOptions
 {
+    /// <summary>
+    /// Used by <see cref="DefaultTenantResolveContributor"/> to resolve a fallback tenant
+    /// when no other tenant resolvers return a value.
+    /// </summary>
+    public string? DefaultTenant { get; set; }
+
     /// <summary>
     /// Default: <see cref="TenantResolverConsts.DefaultTenantKey"/>.
     /// </summary>

framework/src/Volo.Abp.AspNetCore.MultiTenancy/Volo/Abp/AspNetCore/MultiTenancy/DefaultTenantResolveContributor.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+using Volo.Abp.MultiTenancy;
+
+namespace Volo.Abp.AspNetCore.MultiTenancy;
+
+public class DefaultTenantResolveContributor : TenantResolveContributorBase
+{
+    public const string ContributorName = "Default";
+
+    public override string Name => ContributorName;
+
+    public override Task ResolveAsync(ITenantResolveContext context)
+    {
+        var defaultTenant = context.GetAbpAspNetCoreMultiTenancyOptions().DefaultTenant;
+        if (!string.IsNullOrWhiteSpace(defaultTenant))
+        {
+            context.TenantIdOrName = defaultTenant;
+            context.Handled = true;
+        }
+
+        return Task.CompletedTask;
+    }
+}

framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/ConfigurationTenantResolveContributor.cs

@@ -1,27 +0,0 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using System;
-using System.Threading.Tasks;
-using Volo.Abp;
-
-namespace Volo.Abp.MultiTenancy;
-
-public class ConfigurationTenantResolveContributor : TenantResolveContributorBase
-{
-    public const string ContributorName = "Configuration";
-    public override string Name => ContributorName;
-
-    public override async Task ResolveAsync(ITenantResolveContext context)
-    {
-        var configuration = context.ServiceProvider.GetRequiredService<IConfiguration>();
-        var tenantIdOrName = configuration["MultiTenancy:Tenant"]; 
-
-        if (!tenantIdOrName.IsNullOrEmpty())
-        {
-            context.TenantIdOrName = tenantIdOrName;
-        }
-
-        await Task.CompletedTask;
-    }
-}

framework/src/Volo.Abp.MultiTenancy/Volo/Abp/MultiTenancy/ConfigurationTenantResolveOptionsExtensions.cs

@@ -1,17 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace Volo.Abp.MultiTenancy;
-
-public static class ConfigurationTenantResolveOptionsExtensions
-{
-    public static void AddConfigurationTenantResolver(
-        this AbpTenantResolveOptions options)
-    {
-        options.TenantResolvers.InsertAfter(
-            r => r is CurrentUserTenantResolveContributor,
-            new ConfigurationTenantResolveContributor()
-        );
-    }
-}

framework/test/Volo.Abp.AspNetCore.MultiTenancy.Tests/Volo/Abp/AspNetCore/MultiTenancy/AspNetCoreMultiTenancy_Without_DomainResolver_Tests.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Net;
 using System.Threading.Tasks;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
@@ -69,4 +70,23 @@ public class AspNetCoreMultiTenancy_Without_DomainResolver_Tests : AspNetCoreMul
         var result = await GetResponseAsObjectAsync<Dictionary<string, string>>("http://abp.io");
         result["TenantId"].ShouldBe(_testTenantId.ToString());
     }
+
+    [Fact]
+    public async Task Should_Use_DefaultTenant_If_No_Other_Resolvers_Succeed()
+    {
+        _options.DefaultTenant = _testTenantName;
+
+        var result = await GetResponseAsObjectAsync<Dictionary<string, string>>("http://abp.io");
+
+        result["TenantId"].ShouldBe(_testTenantId.ToString());
+    }
+
+    [Fact]
+    public async Task Should_Return_404_If_DefaultTenant_Is_Invalid()
+    {
+        _options.DefaultTenant = "non-existent-tenant";
+
+        // This method asserts the status code internally using ShouldBe(...)
+        await GetResponseAsync("http://abp.io", HttpStatusCode.NotFound);
+    }
 }

framework/test/Volo.Abp.MultiTenancy.Tests/Volo/Abp/MultiTenancy/ConfigurationTenantResolveContributor_Tests.cs

@@ -1,94 +0,0 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.FileProviders;
-using Microsoft.Extensions.Hosting;
-using System.Collections.Generic;
-using System.Threading.Tasks;
-using System;
-using Volo.Abp.MultiTenancy;
-using Xunit;
-using Shouldly;
-
-public class ConfigurationTenantResolveContributor_Tests : MultiTenancyTestBase
-{
-    [Fact]
-    public async Task Should_Resolve_Tenant_From_Configuration()
-    {
-        var context = CreateContext("acme");
-
-        var contributor = new ConfigurationTenantResolveContributor();
-
-        await contributor.ResolveAsync(context);
-
-        context.TenantIdOrName.ShouldBe("acme");
-    }
-
-    [Fact]
-    public async Task Should_Not_Resolve_If_Configuration_Is_Missing()
-    {
-        var context = CreateContext(null); // No tenant set
-
-        var contributor = new ConfigurationTenantResolveContributor();
-
-        await contributor.ResolveAsync(context);
-
-        context.TenantIdOrName.ShouldBeNull();
-    }
-
-    // Reusable setup
-    private static ITenantResolveContext CreateContext(string? tenantName)
-    {
-        var services = new ServiceCollection();
-
-        services.AddSingleton<IHostEnvironment>(new FakeHostEnvironment());
-        var configBuilder = new ConfigurationBuilder();
-
-        if (!string.IsNullOrWhiteSpace(tenantName))
-        {
-            configBuilder.AddInMemoryCollection(
-            [
-                new KeyValuePair<string, string>("MultiTenancy:Tenant", tenantName)
-            ]);
-        }
-
-        services.AddSingleton<IConfiguration>(configBuilder.Build());
-
-        var provider = services.BuildServiceProvider();
-        return new FakeTenantResolveContext(provider);
-    }
-
-    // Fake context
-    private class FakeTenantResolveContext : ITenantResolveContext
-    {
-        public IServiceProvider ServiceProvider { get; }
-
-        public string? TenantIdOrName { get; set; }
-
-        public bool Handled { get; set; }
-
-        public FakeTenantResolveContext(IServiceProvider serviceProvider)
-        {
-            ServiceProvider = serviceProvider;
-        }
-
-        public bool HasResolvedTenantOrHost()
-        {
-            return Handled || !string.IsNullOrWhiteSpace(TenantIdOrName);
-        }
-    }
-
-    private class FakeHostEnvironment : IHostEnvironment
-    {
-        public string EnvironmentName { get; set; } = Environments.Development;
-        public string ApplicationName { get; set; } = "TestApp";
-        public string ContentRootPath { get; set; } = "";
-        public IFileProvider ContentRootFileProvider { get; set; } = new NullFileProvider();
-    }
-
-    private class NullFileProvider : IFileProvider
-    {
-        public IDirectoryContents GetDirectoryContents(string subpath) => new NotFoundDirectoryContents();
-        public IFileInfo GetFileInfo(string subpath) => new NotFoundFileInfo(subpath);
-        public Microsoft.Extensions.Primitives.IChangeToken Watch(string filter) => NullChangeToken.Singleton;
-    }
-}