General question about multi tenancy in Radzen

Radzen.Blazor Components
1

This may be a very basic question but I am a bit confused by the docs about multi tenancy.

So assume I have a blazor web app running on www.myapp.com

This app has many clients each with many users.

So each client is basically a tenant, right?

But in order to create a tenant I need to add host information, but in this case doesn't every tenant use the same host www.myapp.com?

Or do I need to add subdomain for each client like client1.myapp.com?

Maybe this is not even strictly related to Radzen but any help would be very much appreciated.

2

There are different implementations of multi-tenancy, more details about our implementation can be found here:

3

Thanks. Let me rephrase the question: in your implementation - can multiple tenants have the same host? From the link you shared I think so, but confirmation would be nice. Thanks

4

Indeed there is no such restriction.

5

Okay so I created two tenants. Tenant1 and Tenant2. Both have the same host "myapp.com". Each tenant has one user, user1 (tenant1) and user2 (tenant2).

When logging in I think this code is called:

        private ApplicationTenant GetTenant()
        {
            var tenants = Context.Set<ApplicationTenant>().ToList();

            var host = httpContextAccessor.HttpContext.Request.Host.Value;

            return tenants.Where(t => t.Hosts.Split(',').Where(h => h.Contains(host)).Any()).FirstOrDefault();
        }

So now when user2 wants to login, GetTenant() will always return tenant1 and user2 does not belong to tenant1 so logging in is not possible?

6

Tenants and Users are created when logged with tenantsadmin - it's up to you what values you will assign. If you have same host for different user/tenant combination indeed this code will return the first tenant.

7

Okay, but if I understand correctly this means that two tenants cannot have same host because in that case always the first tenant will be returned?

So basically I have to add a new subdomain for every tenant?

8

Yes, that's the example in our documentation article I've referred.

9

I think in your example here Multi-tenancy | Radzen Blazor Studio

tenant2user will not be able to login when navigating to localhost:5001 because tenant1 and tenant2 share the same host (localhost:5001) and therefore always tenant1 will be returned.

10

When logged with tenantsadmin the tenant is switched manually:

image
image1920×1080 79.6 KB

11

Yes I understand. But try logging in with tenantUser2 when on localhost:5001. will not be possible because GetTenant() will always return tenant1.

Or in your case radzen-rocks.com.

Your tenants have hosts like this:

tenant1: localhost:5001, tenant1.radzen-rocks.com
tenant2: localhost:5001, tenant2.radzen-rocks.com

So when user of tenant2 goes to localhost:5001 he cannot login because the code will always return tenant1

12

You are right, maybe we should update the code to provide better user discovery during development:

        public override async Task<ApplicationUser> FindByNameAsync(string normalizedName, CancellationToken cancellationToken = default)
        {
#if DEBUG
            return await base.FindByNameAsync(normalizedName, cancellationToken);
#else
            if (normalizedName.ToLower() == "tenantsadmin")
            {
                return await base.FindByNameAsync(normalizedName, cancellationToken);
            }

            var tenant = GetTenant();
            ApplicationUser user = null;

            if (tenant != null)
            {
                user = await Context.Set<ApplicationUser>().SingleOrDefaultAsync(r => r.NormalizedUserName == normalizedName && r.TenantId == tenant.Id, cancellationToken);
            }

            return user;
#endif
        }
13

So just be sure, you are saying that in production it is a requirement that each tenant has own defined host (e.g. client1.myapp.com) and hosts cannot be shared accross tenants, correct?

14

Yes, that’s the requirement.

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