First Commit

Helpers/ADS.Helpers.MultiTenant/Resolvers/HeaderTenantResolver.cs

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+using ADS.Helpers.MultiTenant.Abstractions;
+using ADS.Helpers.MultiTenant.Configuration;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Options;
+
+namespace ADS.Helpers.MultiTenant.Resolvers;
+
+public sealed class HeaderTenantResolver : ITenantResolver
+{
+    private readonly TenantOptions _opt;
+
+    public HeaderTenantResolver(IOptions<TenantOptions> opt) => _opt = opt.Value;
+
+    public string? Resolve(HttpContext context)
+    {
+        
+        if (context.Request.Headers.TryGetValue(_opt.HeaderName, out var value))
+            return value.ToString();
+        
+        if (!string.IsNullOrWhiteSpace(_opt.DefaultTenantId))
+            return _opt.DefaultTenantId;    
+
+        return null;
+    }
+}