DocSpace-client/common/ASC.Core.Common/Data/DbAzService.cs

/*
 *
 * (c) Copyright Ascensio System Limited 2010-2018
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*/

namespace ASC.Core.Data
{
    [Scope]
    class DbAzService : IAzService
    {
        public Expression<Func<Acl, AzRecord>> FromAclToAzRecord { get; set; }
        private UserDbContext UserDbContext => _lazyUserDbContext.Value;
        private Lazy<UserDbContext> _lazyUserDbContext;

        public DbAzService(DbContextManager<UserDbContext> dbContextManager)
        {
            _lazyUserDbContext = new Lazy<UserDbContext>(() => dbContextManager.Value);
            FromAclToAzRecord = r => new AzRecord
            {
                ActionId = r.Action,
                ObjectId = r.Object,
                Reaction = r.AceType,
                SubjectId = r.Subject,
                Tenant = r.Tenant
            };
        }

        public IEnumerable<AzRecord> GetAces(int tenant, DateTime from)
        {
            // row with tenant = -1 - common for all tenants, but equal row with tenant != -1 escape common row for the portal
            var commonAces =
                UserDbContext.Acl
                .Where(r => r.Tenant == Tenant.DefaultTenant)
                .Select(FromAclToAzRecord)
                .ToDictionary(a => string.Concat(a.Tenant.ToString(), a.SubjectId.ToString(), a.ActionId.ToString(), a.ObjectId));

            var tenantAces =
                UserDbContext.Acl
                .Where(r => r.Tenant == tenant)
                .Select(FromAclToAzRecord)
                .ToList();

            // remove excaped rows
            foreach (var a in tenantAces)
            {
                var key = string.Concat(a.Tenant.ToString(), a.SubjectId.ToString(), a.ActionId.ToString(), a.ObjectId);
                if (commonAces.TryGetValue(key, out var common))
                {
                    commonAces.Remove(key);
                    if (common.Reaction == a.Reaction)
                    {
                        tenantAces.Remove(a);
                    }
                }
            }

            return commonAces.Values.Concat(tenantAces);
        }

        public AzRecord SaveAce(int tenant, AzRecord r)
        {
            r.Tenant = tenant;
            using var tx = UserDbContext.Database.BeginTransaction();
            if (!ExistEscapeRecord(r))
            {
                InsertRecord(r);
            }
            else
            {
                // unescape
                DeleteRecord(r);
            }
            tx.Commit();

            return r;
        }

        public void RemoveAce(int tenant, AzRecord r)
        {
            r.Tenant = tenant;
            using var tx = UserDbContext.Database.BeginTransaction();
            if (ExistEscapeRecord(r))
            {
                // escape
                InsertRecord(r);
            }
            else
            {
                DeleteRecord(r);
            }

            tx.Commit();
        }


        private bool ExistEscapeRecord(AzRecord r)
        {
            return UserDbContext.Acl
                .Where(a => a.Tenant == Tenant.DefaultTenant)
                .Where(a => a.Subject == r.SubjectId)
                .Where(a => a.Action == r.ActionId)
                .Where(a => a.Object == (r.ObjectId ?? string.Empty))
                .Where(a => a.AceType == r.Reaction)
                .Any();
        }

        private void DeleteRecord(AzRecord r)
        {
            var record = UserDbContext.Acl
                .Where(a => a.Tenant == r.Tenant)
                .Where(a => a.Subject == r.SubjectId)
                .Where(a => a.Action == r.ActionId)
                .Where(a => a.Object == (r.ObjectId ?? string.Empty))
                .Where(a => a.AceType == r.Reaction)
                .FirstOrDefault();

            if (record != null)
            {
                UserDbContext.Acl.Remove(record);
                UserDbContext.SaveChanges();
            }
        }

        private void InsertRecord(AzRecord r)
        {
            var record = new Acl
            {
                AceType = r.Reaction,
                Action = r.ActionId,
                Object = r.ObjectId ?? string.Empty,
                Subject = r.SubjectId,
                Tenant = r.Tenant
            };

            UserDbContext.AddOrUpdate(r => r.Acl, record);
            UserDbContext.SaveChanges();
        }
    }
}