Refactor EmailAccountDto and improve encryption logic

Refactored `EmailAccountDto` to focus on SMTP-related properties, removing unused fields. Updated `DependencyInjection` to configure data protection with a new key storage path. Simplified `DataProtectionEncryptionService` by removing redundant checks and error handling for encryption and decryption methods.

src/DigitalData.EmailProfiler.Application/Common/Dtos/EmailAccountDto.cs

@@ -5,19 +5,15 @@ namespace DigitalData.EmailProfiler.Application.Common.Dtos;
 /// </summary>
 public class EmailAccountDto
 {
-    public int Id { get; set; }
+    public string Username { get; set; } = null!;
-    public string AccountName { get; set; } = string.Empty;
+
-    public string ImapServer { get; set; } = string.Empty;
-    public int ImapPort { get; set; }
-    public bool ImapUseSsl { get; set; }
-    public string SmtpServer { get; set; } = string.Empty;
-    public int SmtpPort { get; set; }
-    public bool SmtpUseSsl { get; set; }
-    public string Username { get; set; } = string.Empty;
     public string? EncryptedPassword { get; set; }
+
+    public string SmtpServer { get; set; } = null!;
+
+    public int SmtpPort { get; set; }
+
+    public bool SmtpUseSsl { get; set; }
+
     public bool UseOAuth2 { get; set; }
-    public string? TenantId { get; set; }
-    public string? ClientId { get; set; }
-    public string? EncryptedClientSecret { get; set; }
-    public bool IsActive { get; set; }
 }

src/DigitalData.EmailProfiler.Infrastructure/DependencyInjection.cs

@@ -2,6 +2,7 @@ using DigitalData.EmailProfiler.Application.Common.Interfaces;
 using DigitalData.EmailProfiler.Infrastructure.Messaging;
 using DigitalData.EmailProfiler.Infrastructure.Queue;
 using DigitalData.EmailProfiler.Infrastructure.Services;
+using Microsoft.AspNetCore.DataProtection;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
@@ -43,9 +44,9 @@ public static class DependencyInjection
         services.AddHostedService<RabbitMqCommandConsumer>();
 
         // --- Data Protection (for encryption) ---
-        services.AddDataProtection();
+        services.AddDataProtection()
-            // .PersistKeysToFileSystem(new DirectoryInfo(@"C:\ProgramData\EmailProfiler\Keys"))
+            .PersistKeysToFileSystem(new DirectoryInfo(@"C:\ProgramData\EmailService\Keys"))
-            // .SetApplicationName("EmailProfiler");
+            .SetApplicationName("EmailProfiler");
 
         return services;
     }

src/DigitalData.EmailProfiler.Infrastructure/Services/DataProtectionEncryptionService.cs

@@ -13,25 +13,11 @@ public class DataProtectionEncryptionService(IDataProtectionProvider Provider) :
 
     public string Encrypt(string plainText)
     {
-        if (string.IsNullOrEmpty(plainText))
-            return string.Empty;
-
         return Protector.Protect(plainText);
     }
 
     public string Decrypt(string cipherText)
     {
-        if (string.IsNullOrEmpty(cipherText))
+        return Protector.Unprotect(cipherText);
-            return string.Empty;
-
-        try
-        {
-            return Protector.Unprotect(cipherText);
-        }
-        catch (Exception)
-        {
-            // If decryption fails, return empty (corrupt data or wrong key)
-            return string.Empty;
-        }
     }
 }