Support for third party modules, improved error handling, standardardized enum naming, reorganized interface definitions, support for DB script upgrades, added Settings entity

Oqtane.Server/Repository/Context/MasterDBContext.cs

@@ -0,0 +1,59 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.EntityFrameworkCore;
+using Oqtane.Models;
+using System;
+using System.Linq;
+
+namespace Oqtane.Repository
+{
+    public class MasterDBContext : DbContext
+    {
+        private IHttpContextAccessor accessor;
+
+        public MasterDBContext(DbContextOptions<MasterDBContext> options, IHttpContextAccessor accessor) : base(options)
+        {
+            this.accessor = accessor;
+        }
+
+        public virtual DbSet<Alias> Alias { get; set; }
+        public virtual DbSet<Tenant> Tenant { get; set; }
+
+        public override int SaveChanges()
+        {
+            ChangeTracker.DetectChanges();
+
+            string username = "";
+            if (accessor.HttpContext.User.Identity.Name != null)
+            {
+                username = accessor.HttpContext.User.Identity.Name;
+            }
+            DateTime date = DateTime.Now;
+
+            var created = ChangeTracker.Entries()
+                .Where(x => x.State == EntityState.Added);
+
+            foreach (var item in created)
+            {
+                if (item.Entity is IAuditable entity)
+                {
+                    item.CurrentValues[nameof(IAuditable.CreatedBy)] = username;
+                    item.CurrentValues[nameof(IAuditable.CreatedOn)] = date;
+                }
+            }
+
+            var modified = ChangeTracker.Entries()
+                .Where(x => x.State == EntityState.Modified || x.State == EntityState.Added);
+
+            foreach (var item in modified)
+            {
+                if (item.Entity is IAuditable entity)
+                {
+                    item.CurrentValues[nameof(IAuditable.ModifiedBy)] = username;
+                    item.CurrentValues[nameof(IAuditable.ModifiedOn)] = date;
+                }
+            }
+
+            return base.SaveChanges();
+        }
+    }
+}