Add `ValidateUserNameAsync` & `GetRandomUserNameAsync` to `IdentityUserManager`.

modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/IdentityUserManager.cs

@@ -82,7 +82,7 @@ public class IdentityUserManager : UserManager<IdentityUser>, IDomainService
 
         return await CreateAsync(user);
     }
-    
+
     public async override Task<IdentityResult> DeleteAsync(IdentityUser user)
     {
         user.Claims.Clear();
@@ -397,4 +397,43 @@ public class IdentityUserManager : UserManager<IdentityUser>, IDomainService
 
         await UserRepository.UpdateOrganizationAsync(sourceOrganizationId, targetOrganizationId, CancellationToken);
     }
+
+    public virtual async Task<bool> ValidateUserNameAsync(string userName, Guid? userId = null)
+    {
+        if (string.IsNullOrWhiteSpace(userName))
+        {
+            return false;
+        }
+
+        if (!string.IsNullOrEmpty(Options.User.AllowedUserNameCharacters) && userName.Any(c => !Options.User.AllowedUserNameCharacters.Contains(c)))
+        {
+            return false;
+        }
+
+        var owner = await FindByNameAsync(userName);
+        if (owner != null && owner.Id != userId)
+        {
+            return false;
+        }
+
+        return true;
+    }
+
+    public virtual Task<string> GetRandomUserNameAsync(int length)
+    {
+        var allowedUserNameCharacters = Options.User.AllowedUserNameCharacters;
+        if (allowedUserNameCharacters.IsNullOrWhiteSpace())
+        {
+            allowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@+";
+        }
+
+        var randomUserName = string.Empty;
+        var random = new Random();
+        while (randomUserName.Length < length)
+        {
+            randomUserName += allowedUserNameCharacters[random.Next(0, allowedUserNameCharacters.Length)];
+        }
+
+        return Task.FromResult(randomUserName);
+    }
 }

modules/identity/test/Volo.Abp.Identity.Domain.Tests/Volo/Abp/Identity/IdentityUserManager_Tests.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Security.Claims;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.Extensions.DependencyInjection;
@@ -378,6 +379,49 @@ public class IdentityUserManager_Tests : AbpIdentityDomainTestBase
         }
     }
 
+    [Fact]
+    public async Task ValidateUserNameAsync()
+    {
+        var result = await _identityUserManager.ValidateUserNameAsync("M_y+User-001@abp.io");
+        result.ShouldBeTrue();
+
+        var user = CreateRandomUser();
+        (await _identityUserManager.CreateAsync(user)).CheckErrors();
+
+        result = await _identityUserManager.ValidateUserNameAsync(user.UserName, user.Id);
+        result.ShouldBeTrue();
+
+        result = await _identityUserManager.ValidateUserNameAsync(user.UserName);
+        result.ShouldBeFalse();
+
+        result = await _identityUserManager.ValidateUserNameAsync("无效的字符");
+        result.ShouldBeFalse();
+    }
+
+    [Fact]
+    public async Task GetRandomUserNameAsync()
+    {
+        _identityUserManager.Options.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@+";
+        var username = await _identityUserManager.GetRandomUserNameAsync(15);
+        username.Length.ShouldBe(15);
+        username.All(c => _identityUserManager.Options.User.AllowedUserNameCharacters.Contains(c)).ShouldBeTrue();
+
+        _identityUserManager.Options.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyz0123456789";
+        username = await _identityUserManager.GetRandomUserNameAsync(15);
+        username.Length.ShouldBe(15);
+        username.All(c => _identityUserManager.Options.User.AllowedUserNameCharacters.Contains(c)).ShouldBeTrue();
+
+        _identityUserManager.Options.User.AllowedUserNameCharacters = "0123456789";
+        username = await _identityUserManager.GetRandomUserNameAsync(15);
+        username.Length.ShouldBe(15);
+        username.All(c => _identityUserManager.Options.User.AllowedUserNameCharacters.Contains(c)).ShouldBeTrue();
+
+        _identityUserManager.Options.User.AllowedUserNameCharacters = null!;
+        username = await _identityUserManager.GetRandomUserNameAsync(15);
+        username.Length.ShouldBe(15);
+        username.All(c => "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@+".Contains(c)).ShouldBeTrue();
+    }
+
     private async Task CreateRandomDefaultRoleAsync()
     {
         await _identityRoleRepository.InsertAsync(