feat: actually implement system audio + refactor

notetaker/Managers/KeychainHelper.swift

@@ -0,0 +1,70 @@
+// KeychainHelper.swift
+// Secure storage helper for API keys and sensitive data
+
+import Foundation
+import Security
+
+/// Manages secure storage of sensitive data using the macOS Keychain
+class KeychainHelper {
+    static let shared = KeychainHelper()
+    
+    private let serviceName = "owen.notetaker"
+    
+    private init() {}
+    
+    /// Saves a string value to the keychain
+    /// - Parameters:
+    ///   - value: The string value to save
+    ///   - key: The key to save the value under
+    /// - Returns: True if the save was successful, false otherwise
+    func save(_ value: String, forKey key: String) -> Bool {
+        guard let data = value.data(using: .utf8) else { return false }
+        
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrAccount as String: key,
+            kSecValueData as String: data,
+            kSecAttrService as String: serviceName
+        ]
+        
+        // Delete any existing item
+        SecItemDelete(query as CFDictionary)
+        
+        // Add the new item
+        let status = SecItemAdd(query as CFDictionary, nil)
+        return status == errSecSuccess
+    }
+    
+    /// Retrieves a string value from the keychain
+    /// - Parameter key: The key to retrieve the value for
+    /// - Returns: The string value if found, nil otherwise
+    func get(forKey key: String) -> String? {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrAccount as String: key,
+            kSecAttrService as String: serviceName,
+            kSecMatchLimit as String: kSecMatchLimitOne,
+            kSecReturnData as String: true
+        ]
+        
+        var item: AnyObject?
+        let status = SecItemCopyMatching(query as CFDictionary, &item)
+        
+        guard status == errSecSuccess, let data = item as? Data else { return nil }
+        return String(data: data, encoding: .utf8)
+    }
+    
+    /// Deletes a value from the keychain
+    /// - Parameter key: The key to delete
+    /// - Returns: True if the deletion was successful, false otherwise
+    func delete(forKey key: String) -> Bool {
+        let query: [String: Any] = [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrAccount as String: key,
+            kSecAttrService as String: serviceName
+        ]
+        
+        let status = SecItemDelete(query as CFDictionary)
+        return status == errSecSuccess
+    }
+}