delete attachments

src/Core/Models/Table/Cipher.cs

@@ -1,10 +1,15 @@
 using System;
 using Bit.Core.Utilities;
+using Bit.Core.Models.Data;
+using Newtonsoft.Json;
+using System.Collections.Generic;
 
 namespace Bit.Core.Models.Table
 {
     public class Cipher : IDataObject<Guid>
     {
+        private Dictionary<string, CipherAttachment.MetaData> _attachmentData;
+
         public Guid Id { get; set; }
         public Guid? UserId { get; set; }
         public Guid? OrganizationId { get; set; }
@@ -20,5 +25,71 @@ namespace Bit.Core.Models.Table
         {
             Id = CoreHelpers.GenerateComb();
         }
+
+        public Dictionary<string, CipherAttachment.MetaData> GetAttachments()
+        {
+            if(string.IsNullOrWhiteSpace(Attachments))
+            {
+                return null;
+            }
+
+            if(_attachmentData != null)
+            {
+                return _attachmentData;
+            }
+
+            try
+            {
+                _attachmentData = JsonConvert.DeserializeObject<Dictionary<string, CipherAttachment.MetaData>>(Attachments);
+                return _attachmentData;
+            }
+            catch
+            {
+                return null;
+            }
+        }
+
+        public void SetAttachments(Dictionary<string, CipherAttachment.MetaData> data)
+        {
+            if(data == null || data.Count == 0)
+            {
+                _attachmentData = null;
+                Attachments = null;
+                return;
+            }
+
+            _attachmentData = data;
+            Attachments = JsonConvert.SerializeObject(_attachmentData);
+        }
+
+        public void AddAttachment(string id, CipherAttachment.MetaData data)
+        {
+            var attachments = GetAttachments();
+            if(attachments == null)
+            {
+                attachments = new Dictionary<string, CipherAttachment.MetaData>();
+            }
+
+            attachments.Add(id, data);
+            SetAttachments(attachments);
+        }
+
+        public void DeleteAttachment(string id)
+        {
+            var attachments = GetAttachments();
+            if(!attachments?.ContainsKey(id) ?? true)
+            {
+                return;
+            }
+
+            attachments.Remove(id);
+            SetAttachments(attachments);
+        }
+
+        public bool ContainsAttachment(string id)
+        {
+            var attachments = GetAttachments();
+            return attachments?.ContainsKey(id) ?? false;
+        }
     }
 }