add support for storing u2f challenges

src/Core/Models/Table/U2f.cs

@@ -0,0 +1,20 @@
+using System;
+
+namespace Bit.Core.Models.Table
+{
+    public class U2f : IDataObject<int>
+    {
+        public int Id { get; set; }
+        public Guid UserId { get; set; }
+        public string KeyHandle { get; set; }
+        public string Challenge { get; set; }
+        public string AppId { get; set; }
+        public string Version { get; set; }
+        public DateTime CreationDate { get; internal set; } = DateTime.UtcNow;
+
+        public void SetNewId()
+        {
+            // do nothing since it is an identity
+        }
+    }
+}

src/Core/Repositories/IU2fRepository.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Bit.Core.Models.Table;
+
+namespace Bit.Core.Repositories
+{
+    public interface IU2fRepository : IRepository<U2f, int>
+    {
+        Task<ICollection<U2f>> GetManyByUserIdAsync(Guid userId);
+        Task DeleteManyByUserIdAsync(Guid userId);
+    }
+}

src/Core/Repositories/SqlServer/U2fRepository.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using System.Data.SqlClient;
+using System.Threading.Tasks;
+using Bit.Core.Models.Table;
+using System.Data;
+using Dapper;
+
+namespace Bit.Core.Repositories.SqlServer
+{
+    public class U2fRepository : Repository<U2f, int>, IU2fRepository
+    {
+        public U2fRepository(GlobalSettings globalSettings)
+            : this(globalSettings.SqlServer.ConnectionString)
+        { }
+
+        public U2fRepository(string connectionString)
+            : base(connectionString)
+        { }
+
+        public async Task<ICollection<U2f>> GetManyByUserIdAsync(Guid userId)
+        {
+            using(var connection = new SqlConnection(ConnectionString))
+            {
+                var results = await connection.QueryAsync<U2f>(
+                    $"[{Schema}].[U2f_ReadByUserId]",
+                    new { UserId = userId },
+                    commandType: CommandType.StoredProcedure);
+
+                return results.ToList();
+            }
+        }
+
+        public async Task DeleteManyByUserIdAsync(Guid userId)
+        {
+            using(var connection = new SqlConnection(ConnectionString))
+            {
+                await connection.ExecuteAsync(
+                    $"[{Schema}].[U2f_DeleteByUserId]",
+                    new { UserId = userId },
+                    commandType: CommandType.StoredProcedure);
+            }
+        }
+
+        public override Task<U2f> GetByIdAsync(int id)
+        {
+            throw new NotSupportedException();
+        }
+
+        public override Task ReplaceAsync(U2f obj)
+        {
+            throw new NotSupportedException();
+        }
+
+        public override Task UpsertAsync(U2f obj)
+        {
+            throw new NotSupportedException();
+        }
+
+        public override Task DeleteAsync(U2f obj)
+        {
+            throw new NotSupportedException();
+        }
+    }
+}