Initial Commit

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+DerivedData/
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata

Package.swift

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+// swift-tools-version:5.5
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "KeychainWrapper",
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "KeychainWrapper",
+            targets: ["KeychainWrapper"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "KeychainWrapper",
+            dependencies: []),
+        .testTarget(
+            name: "KeychainWrapperTests",
+            dependencies: ["KeychainWrapper"]),
+    ]
+)

README.md

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+# KeychainWrapper
+
+A description of this package.

Sources/KeychainWrapper/KeychainWrapper.swift

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+import Foundation
+
+public typealias KeychainService = String
+public typealias KeychainKey = String
+
+public class KeychainWrapper {
+    private let service: String
+
+    public init(service: String) {
+        self.service = service
+    }
+
+    private func keychainQuery(withService service: KeychainService, forKey key: KeychainKey) -> [String: Any] {
+        return [
+            kSecClass as String: kSecClassGenericPassword,
+            kSecAttrService as String: service,
+            kSecAttrAccount as String: key,
+            kSecAttrAccessible as String: kSecAttrAccessibleAfterFirstUnlock,
+            kSecAttrSynchronizable as String: kCFBooleanTrue!
+        ]
+    }
+
+    @discardableResult
+    public func set(_ string: String, forKey key: KeychainKey) -> Bool {
+        var query = keychainQuery(withService: service, forKey: key)
+
+        guard let data = string.data(using: .utf8) else {
+            return false
+        }
+
+        guard SecItemCopyMatching(query as CFDictionary, nil) == noErr else {
+            query[kSecValueData as String] = data
+            let status = SecItemAdd(query as CFDictionary, nil)
+            return status == errSecSuccess
+        }
+
+        return SecItemUpdate(
+            query as CFDictionary,
+            NSDictionary(dictionary: [kSecValueData: data])
+        ) == errSecSuccess
+    }
+
+    public func get(stringForKey key: KeychainKey) -> String? {
+        var query = keychainQuery(withService: service, forKey: key)
+        query[kSecReturnData as String] = kCFBooleanTrue
+        query[kSecReturnAttributes as String] = kCFBooleanTrue
+
+        var result: CFTypeRef?
+        guard SecItemCopyMatching(query as CFDictionary, &result) == noErr else {
+            return nil
+        }
+
+        guard
+            let dictionary = result as? [String: Any],
+            let data = dictionary[kSecValueData as String] as? Data
+        else {
+            return nil
+        }
+
+        return String(data: data, encoding: .utf8)
+    }
+
+    @discardableResult
+    public func remove(valueForKey key: KeychainKey) -> Bool {
+        let query = keychainQuery(withService: service, forKey: key)
+        return SecItemDelete(query as CFDictionary) == noErr
+    }
+
+    public subscript(key: KeychainKey) -> String? {
+        get {
+            return get(stringForKey: key)
+        } set {
+            guard let value = newValue else {
+                remove(valueForKey: key)
+                return
+            }
+            set(value, forKey: key)
+        }
+    }
+}

Tests/KeychainWrapperTests/KeychainWrapperTests.swift

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+import XCTest
+@testable import KeychainWrapper
+
+final class KeychainWrapperTests: XCTestCase {
+
+    private var sut: KeychainWrapper!
+
+    override func setUp() {
+        super.setUp()
+        sut = KeychainWrapper(service: "unitTests")
+    }
+
+    override func tearDown() {
+        sut = nil
+        super.tearDown()
+    }
+}