83 lines
2.3 KiB
Swift
83 lines
2.3 KiB
Swift
//
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// KeychainStorage.swift
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// KeychainStorage
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//
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// Created by Javier Cicchelli on 11/12/2022.
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// Copyright © 2022 Röck+Cöde. All rights reserved.
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//
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import Foundation
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import KeychainAccess
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import SwiftUI
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@propertyWrapper
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public struct KeychainStorage<Model: Codable>: DynamicProperty {
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// MARK: Type aliases
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public typealias Value = Model
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// MARK: States
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@State private var value: Value?
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// MARK: Properties
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private let key: String
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private let keychain: Keychainable
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private let decoder: JSONDecoder = .init()
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private let encoder: JSONEncoder = .init()
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public var wrappedValue: Value? {
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get { value }
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nonmutating set {
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value = newValue
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do {
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if let newValue {
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let encodedValue = try encoder.encode(newValue)
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try keychain.set(encodedValue, key: key, ignoringAttributeSynchronizable: true)
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} else {
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try keychain.remove(key, ignoringAttributeSynchronizable: true)
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}
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} catch {
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assertionFailure("The '\(key)' key should have either be set or removed from the keychain storage.")
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}
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}
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}
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public var projectedValue: Binding<Value?> {
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.init { wrappedValue } set: { wrappedValue = $0 }
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}
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// MARK: Initialisers
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public init(
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key: String,
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defaultValue: Value? = nil,
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keychain: Keychainable = Keychain()
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) {
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self.key = key
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self.keychain = keychain
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do {
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guard let data = try keychain.getData(key, ignoringAttributeSynchronizable: true) else {
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self._value = .init(initialValue: defaultValue)
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return
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}
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do {
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let model = try decoder.decode(Value.self, from: data)
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self._value = .init(initialValue: model)
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} catch {
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assertionFailure("The data for the '\(key)' key should have been decoded properly.")
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}
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} catch {
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assertionFailure("The data of the '\(key)' key should have been obtained from the keychain storage.")
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}
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}
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}
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