attachments on view page abd device actions

src/Core/Abstractions/ICipherService.cs

@@ -35,5 +35,6 @@ namespace Bit.Core.Abstractions
         Task UpdateLastUsedDateAsync(string id);
         Task UpsertAsync(CipherData cipher);
         Task UpsertAsync(List<CipherData> cipher);
+        Task<byte[]> DownloadAndDecryptAttachmentAsync(AttachmentView attachment, string organizationId);
     }
 }

src/Core/Constants.cs

@@ -9,5 +9,6 @@
         public static string DefaultUriMatch = "defaultUriMatch";
         public static string DisableAutoTotpCopyKey = "disableAutoTotpCopy";
         public static string EnvironmentUrlsKey = "environmentUrls";
+        public static string LastFileCacheClearKey = "lastFileCacheClear";
     }
 }

src/Core/Models/View/AttachmentView.cs

@@ -20,5 +20,17 @@ namespace Bit.Core.Models.View
         public string SizeName { get; set; }
         public string FileName { get; set; }
         public SymmetricCryptoKey Key { get; set; }
+
+        public long FileSize
+        {
+            get
+            {
+                if(!string.IsNullOrWhiteSpace(Size) && long.TryParse(Size, out var s))
+                {
+                    return s;
+                }
+                return 0;
+            }
+        }
     }
 }

src/Core/Services/CipherService.cs

@@ -678,6 +678,27 @@ namespace Bit.Core.Services
             await DeleteAttachmentAsync(id, attachmentId);
         }
 
+        public async Task<byte[]> DownloadAndDecryptAttachmentAsync(AttachmentView attachment, string organizationId)
+        {
+            try
+            {
+                var response = await _httpClient.GetAsync(new Uri(attachment.Url));
+                if(!response.IsSuccessStatusCode)
+                {
+                    return null;
+                }
+                var data = await response.Content.ReadAsByteArrayAsync();
+                if(data == null)
+                {
+                    return null;
+                }
+                var key = attachment.Key ?? await _cryptoService.GetOrgKeyAsync(organizationId);
+                return await _cryptoService.DecryptFromBytesAsync(data, key);
+            }
+            catch { }
+            return null;
+        }
+
         // Helpers
 
         private async Task ShareAttachmentWithServerAsync(AttachmentView attachmentView, string cipherId,