| | | 1 | | using System.Linq.Expressions; |
| | | 2 | | using Elsa.Common.Entities; |
| | | 3 | | using Elsa.Common.Multitenancy; |
| | | 4 | | using Elsa.Tenants.Options; |
| | | 5 | | using Microsoft.EntityFrameworkCore; |
| | | 6 | | using Microsoft.EntityFrameworkCore.Metadata; |
| | | 7 | | using Microsoft.Extensions.Options; |
| | | 8 | | |
| | | 9 | | namespace Elsa.Persistence.EFCore.EntityHandlers; |
| | | 10 | | |
| | | 11 | | /// <summary> |
| | | 12 | | /// Represents a class that applies a filter to set the TenantId for entities. |
| | | 13 | | /// </summary> |
| | 24 | 14 | | public class SetTenantIdFilter(IOptions<TenantsOptions> tenantsOptions) : IEntityModelCreatingHandler |
| | | 15 | | { |
| | | 16 | | /// <inheritdoc /> |
| | | 17 | | public void Handle(ElsaDbContextBase dbContext, ModelBuilder modelBuilder, IMutableEntityType entityType) |
| | | 18 | | { |
| | 174 | 19 | | if (!typeof(Entity).IsAssignableFrom(entityType.ClrType)) |
| | 90 | 20 | | return; |
| | | 21 | | |
| | | 22 | | // Only apply the tenant filter if multitenancy is enabled |
| | 84 | 23 | | if (!tenantsOptions.Value.IsEnabled) |
| | 0 | 24 | | return; |
| | | 25 | | |
| | 84 | 26 | | modelBuilder |
| | 84 | 27 | | .Entity(entityType.ClrType) |
| | 84 | 28 | | .HasQueryFilter(CreateTenantFilterExpression(dbContext, entityType.ClrType)); |
| | 84 | 29 | | } |
| | | 30 | | |
| | | 31 | | private LambdaExpression CreateTenantFilterExpression(ElsaDbContextBase dbContext, Type clrType) |
| | | 32 | | { |
| | 84 | 33 | | var parameter = Expression.Parameter(clrType, "e"); |
| | | 34 | | |
| | | 35 | | // e => EF.Property<string>(e, "TenantId") == this.TenantId || EF.Property<string>(e, "TenantId") == "*" || (EF. |
| | 84 | 36 | | var tenantIdProperty = Expression.Call( |
| | 84 | 37 | | typeof(EF), |
| | 84 | 38 | | nameof(EF.Property), |
| | 84 | 39 | | [typeof(string)], |
| | 84 | 40 | | parameter, |
| | 84 | 41 | | Expression.Constant("TenantId")); |
| | | 42 | | |
| | 84 | 43 | | var tenantIdOnContext = Expression.Property( |
| | 84 | 44 | | Expression.Constant(dbContext), |
| | 84 | 45 | | nameof(ElsaDbContextBase.TenantId)); |
| | | 46 | | |
| | 84 | 47 | | var equalityCheck = Expression.Equal(tenantIdProperty, tenantIdOnContext); |
| | 84 | 48 | | var agnosticCheck = Expression.Equal(tenantIdProperty, Expression.Constant(Tenant.AgnosticTenantId, typeof(strin |
| | | 49 | | |
| | | 50 | | // For backwards compatibility: include records with null TenantId when context TenantId is empty string |
| | 84 | 51 | | var nullTenantCheck = Expression.Equal(tenantIdProperty, Expression.Constant(null, typeof(string))); |
| | 84 | 52 | | var emptyContextCheck = Expression.Equal(tenantIdOnContext, Expression.Constant(string.Empty, typeof(string))); |
| | 84 | 53 | | var backwardsCompatibilityCheck = Expression.AndAlso(nullTenantCheck, emptyContextCheck); |
| | | 54 | | |
| | 84 | 55 | | var body = Expression.OrElse( |
| | 84 | 56 | | Expression.OrElse(equalityCheck, agnosticCheck), |
| | 84 | 57 | | backwardsCompatibilityCheck); |
| | | 58 | | |
| | 84 | 59 | | return Expression.Lambda(body, parameter); |
| | | 60 | | } |
| | | 61 | | } |