Added SecureStorage property wrapper

Sources/SecureStorage.swift

@@ -0,0 +1,207 @@
+//
+//  Keychain Property Wrapper.swift
+//  Due Tomorrow
+//
+//  Created by Morris Richman on 3/9/25.
+//
+
+import Foundation
+import KeychainSwift
+import SwiftUI
+
+/// Update the values to change the defaults for SecureStorage
+public class SecureStorageDefaults {
+    /// The `KeychainSwift` being saved with
+    public static var keychain = KeychainSwift()
+    /// Access controls for keychain
+    public static var access: KeychainSwiftAccessOptions? = nil
+}
+
+/// A property wrapper to easily and securely save data in Keychain
+@propertyWrapper
+public struct SecureStorage<T: ExpressibleByNilLiteral> {
+    /// The key for the value in keychain
+    let key: String
+    /// The `KeychainSwift` being saved with
+    var keychain: KeychainSwift
+    /// Access controls for keychain
+    var access: KeychainSwiftAccessOptions?
+
+    /// The underlying get function for wrappedValue
+    /// - Returns: `T`
+    let _get: () -> T
+    /// The underlying set function for wrappedValue
+    /// - Parameters:
+    ///   - `T`: The new value being set
+    let _set: (T) -> Void
+
+    public var wrappedValue: T {
+        get {
+            _get()
+        }
+        set {
+            _set(newValue)
+        }
+    }
+
+    /// The Default Initializer for `SecureStorage`
+    /// - Parameters:
+    ///   - key: The key for the value in keychain
+    ///   - keychain: The `KeychainSwift` being saved with
+    ///   - access: Access controls for keychain
+    init(
+        _ key: String,
+        keychain: KeychainSwift = SecureStorageDefaults.keychain,
+        withAccess access: KeychainSwiftAccessOptions? = SecureStorageDefaults.access
+    ) {
+        self.key = key
+        self.keychain = keychain
+        self.access = access
+
+        self._get = { nil }
+        self._set = { _ in fatalError("Unsupported Type") }
+    }
+}
+
+// MARK: Support String
+extension SecureStorage where T == String? {
+    /// The Initializer for `SecureStorage`
+    /// - Parameters:
+    ///   - key: The key for the value in keychain
+    ///   - keychain: The `KeychainSwift` being saved with
+    ///   - access: Access controls for keychain
+    public init(
+        _ key: String,
+        keychain: KeychainSwift = SecureStorageDefaults.keychain,
+        withAccess access: KeychainSwiftAccessOptions? = SecureStorageDefaults.access
+    ) {
+        self.key = key
+        self.keychain = keychain
+        self.access = access
+
+        self._get = {
+            keychain.get(key)
+        }
+        self._set = { newValue in
+            guard let newValue else {
+                keychain.delete(key)
+                return
+            }
+
+            keychain.set(newValue, forKey: key, withAccess: access)
+        }
+    }
+}
+
+// MARK: Support Bool
+extension SecureStorage where T == Optional<Bool> {
+    /// The Initializer for `SecureStorage`
+    /// - Parameters:
+    ///   - key: The key for the value in keychain
+    ///   - keychain: The `KeychainSwift` being saved with
+    ///   - access: Access controls for keychain
+    public init(
+        _ key: String,
+        keychain: KeychainSwift = SecureStorageDefaults.keychain,
+        withAccess access: KeychainSwiftAccessOptions? = SecureStorageDefaults.access
+    ) {
+        self.key = key
+        self.keychain = keychain
+        self.access = access
+
+        self._get = {
+            keychain.getBool(key)
+        }
+        self._set = { newValue in
+            guard let newValue else {
+                keychain.delete(key)
+                return
+            }
+
+            keychain.set(newValue, forKey: key, withAccess: access)
+        }
+    }
+}
+
+// MARK: Support Data
+extension SecureStorage where T == Optional<Data> {
+    /// The Initializer for `SecureStorage`
+    /// - Parameters:
+    ///   - key: The key for the value in keychain
+    ///   - keychain: The `KeychainSwift` being saved with
+    ///   - access: Access controls for keychain
+    public init(
+        _ key: String,
+        keychain: KeychainSwift = SecureStorageDefaults.keychain,
+        withAccess access: KeychainSwiftAccessOptions? = SecureStorageDefaults.access
+    ) {
+        self.key = key
+        self.keychain = keychain
+        self.access = access
+
+        self._get = {
+            keychain.getData(key)
+        }
+        self._set = { newValue in
+            guard let newValue else {
+                keychain.delete(key)
+                return
+            }
+
+            keychain.set(newValue, forKey: key, withAccess: access)
+        }
+    }
+}
+
+// MARK: Support Codable
+
+// WARNING: Corrupts Data when saving. Possible bit overflow
+//extension SecureStorage where T: Codable & ExpressibleByNilLiteral {
+//    /// The Initializer for `SecureStorage`
+//    /// - Parameters:
+//    ///   - key: The key for the value in keychain
+//    ///   - keychain: The `KeychainSwift` being saved with
+//    ///   - access: Access controls for keychain
+//    public init(
+//        _ key: String,
+//        keychain: KeychainSwift = .init(),
+//        withAccess access: KeychainSwiftAccessOptions? = nil
+//    ) {
+//        self.key = key
+//        self.keychain = keychain
+//        self.access = access
+//        
+//        self._get = {
+//            guard let data = keychain.getData(key) else { return nil }
+//            let jsonDecoder = JSONDecoder()
+//            jsonDecoder.keyDecodingStrategy = .convertFromSnakeCase
+//            do {
+//                return try jsonDecoder.decode(T.self, from: data)
+//            } catch {
+//                return nil
+//            }
+//        }
+//        self._set = { newValue in
+//            guard "\(newValue)" != "nil" else {
+//                guard let data = keychain.getData(key) else {
+//                    return
+//                }
+//                let jsonDecoder = JSONDecoder()
+//                if (try? jsonDecoder.decode(T.self, from: data)) != nil {
+//                    keychain.delete(key)
+//                }
+//                return
+//            }
+//            
+//            let jsonEncoder = JSONEncoder()
+//            jsonEncoder.keyEncodingStrategy = .convertToSnakeCase
+//            
+//            do {
+//                let data = try jsonEncoder.encode(newValue)
+//                keychain.set(data, forKey: key, withAccess: access)
+//            } catch {
+//                print("❌ Data Not Saved to Keychain!")
+//            }
+//        }
+//    }
+//}