Added mailboxes as local data sources (#1022)

app/MindWork AI Studio/Settings/DataModel/MailboxTransportSecurityExtensions.cs

@@ -0,0 +1,38 @@
+using AIStudio.Tools.PluginSystem;
+
+namespace AIStudio.Settings.DataModel;
+
+public static class MailboxTransportSecurityExtensions
+{
+    /// <summary>
+    /// The port IMAP with TLS from the start usually listens on.
+    /// </summary>
+    public const int SSL_ON_CONNECT_PORT = 993;
+
+    /// <summary>
+    /// The port IMAP with STARTTLS usually listens on.
+    /// </summary>
+    public const int STARTTLS_PORT = 143;
+
+    private static string TB(string fallbackEN) => I18N.I.T(fallbackEN, typeof(MailboxTransportSecurityExtensions).Namespace, nameof(MailboxTransportSecurityExtensions));
+
+    public static string GetName(this MailboxTransportSecurity transportSecurity) => transportSecurity switch
+    {
+        MailboxTransportSecurity.SSL_ON_CONNECT => TB("TLS from the start (usually port 993)"),
+        MailboxTransportSecurity.STARTTLS => TB("STARTTLS (usually port 143)"),
+
+        _ => TB("Unknown encryption"),
+    };
+
+    /// <summary>
+    /// The port the encryption usually comes with.
+    /// </summary>
+    /// <returns>The port, or null when there is no usual one.</returns>
+    public static int? GetUsualPort(this MailboxTransportSecurity transportSecurity) => transportSecurity switch
+    {
+        MailboxTransportSecurity.SSL_ON_CONNECT => SSL_ON_CONNECT_PORT,
+        MailboxTransportSecurity.STARTTLS => STARTTLS_PORT,
+
+        _ => null,
+    };
+}