org.UseGroups check on all group saves

src/Core/Services/Implementations/GroupService.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Threading.Tasks;
+using Bit.Core.Exceptions;
+using Bit.Core.Models.Table;
+using Bit.Core.Repositories;
+using System.Collections.Generic;
+
+namespace Bit.Core.Services
+{
+    public class GroupService : IGroupService
+    {
+        private readonly IOrganizationRepository _organizationRepository;
+        private readonly IGroupRepository _groupRepository;
+
+        public GroupService(
+            IOrganizationRepository organizationRepository,
+            IGroupRepository groupRepository)
+        {
+            _organizationRepository = organizationRepository;
+            _groupRepository = groupRepository;
+        }
+
+        public async Task SaveAsync(Group group, IEnumerable<Guid> collectionIds = null)
+        {
+            var org = await _organizationRepository.GetByIdAsync(group.OrganizationId);
+            if(org == null)
+            {
+                throw new BadRequestException("Organization not found");
+            }
+
+            if(!org.UseGroups)
+            {
+                throw new BadRequestException("This organization cannot use groups.");
+            }
+
+            if(group.Id == default(Guid))
+            {
+                if(collectionIds == null)
+                {
+                    await _groupRepository.CreateAsync(group);
+                }
+                else
+                {
+                    await _groupRepository.CreateAsync(group, collectionIds);
+                }
+            }
+            else
+            {
+                if(collectionIds == null)
+                {
+                    await _groupRepository.ReplaceAsync(group);
+                }
+                else
+                {
+                    await _groupRepository.ReplaceAsync(group, collectionIds);
+                }
+            }
+        }
+    }
+}