refactored code structure

Sources/KeychainHelper.swift

@@ -0,0 +1,51 @@
+//
+//  KeychainHelper.swift
+//  iKeyMon
+//
+//  Created by tracer on 30.03.25.
+//
+
+import Foundation
+import Security
+
+enum KeychainHelper {
+    static func save(apiKey: String, for hostname: String) {
+        let data = Data(apiKey.utf8)
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrAccount as String: hostname,
+            kSecValueData as String: data
+        ]
+
+        SecItemDelete(query as CFDictionary) // Overwrite existing
+        SecItemAdd(query as CFDictionary, nil)
+    }
+
+    static func loadApiKey(for hostname: String) -> String? {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrAccount as String: hostname,
+            kSecReturnData as String: true,
+            kSecMatchLimit as String: kSecMatchLimitOne
+        ]
+
+        var result: AnyObject?
+        let status = SecItemCopyMatching(query as CFDictionary, &result)
+
+        if status == errSecSuccess,
+           let data = result as? Data,
+           let string = String(data: data, encoding: .utf8) {
+            return string
+        }
+
+        return nil
+    }
+
+    static func deleteApiKey(for hostname: String) {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrAccount as String: hostname
+        ]
+        SecItemDelete(query as CFDictionary)
+    }
+}