WIP Clean Architecture

Windows 8.1 App Uses keepasslib v2.44 (temporarily)

ModernKeePass.Application/Database/Queries/OpenDatabase/OpenDatabaseQuery.cs

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+using System.Threading;
+using System.Threading.Tasks;
+using AutoMapper;
+using MediatR;
+using ModernKeePass.Application.Common.Interfaces;
+using ModernKeePass.Application.Database.Models;
+using ModernKeePass.Application.Database.Queries.IsDatabaseOpen;
+using ModernKeePass.Application.Group.Models;
+using ModernKeePass.Domain.Dtos;
+using ModernKeePass.Domain.Exceptions;
+
+namespace ModernKeePass.Application.Database.Queries.OpenDatabase
+{
+    public class OpenDatabaseQuery: IRequest<DatabaseVm>
+    {
+        public FileInfo FileInfo { get; set; }
+        public Credentials Credentials { get; set; }
+
+        public class OpenDatabaseQueryHandler : IRequestHandler<OpenDatabaseQuery, DatabaseVm>
+        {
+            private readonly IMapper _mapper;
+            private readonly IMediator _mediator;
+            private readonly IDatabaseProxy _databaseProxy;
+
+            public OpenDatabaseQueryHandler(IMapper mapper, IMediator mediator, IDatabaseProxy databaseProxy)
+            {
+                _mapper = mapper;
+                _mediator = mediator;
+                _databaseProxy = databaseProxy;
+            }
+
+            public async Task<DatabaseVm> Handle(OpenDatabaseQuery request, CancellationToken cancellationToken)
+            {
+                var isDatabaseOpen = await _mediator.Send(new IsDatabaseOpenQuery(), cancellationToken);
+                if (isDatabaseOpen) throw new DatabaseOpenException();
+
+                var database = await _databaseProxy.Open(request.FileInfo, request.Credentials);
+                var databaseVm = new DatabaseVm
+                {
+                    IsOpen = true,
+                    Name = database.Name,
+                    RootGroup = _mapper.Map<GroupVm>(database.RootGroupEntity)
+                };
+                return databaseVm;
+            }
+        }
+    }
+}