Initial project setup.

ElementX/Sources/Modules/Authentication/KeychainController.swift

@@ -0,0 +1,57 @@
+//
+//  KeychainController.swift
+//  ElementX
+//
+//  Created by Stefan Ceriu on 14.02.2022.
+//
+
+import Foundation
+import KeychainAccess
+
+class KeychainController: KeychainControllerProtocol {
+    
+    struct Constants {
+        static let restoreTokenGroupKey = "restoreTokens"
+    }
+    
+    private let keychain: Keychain
+    
+    init(identifier: String) {
+        keychain = Keychain(service: identifier)
+    }
+ 
+    func setRestoreToken(_ token: String, forUsername username: String) {
+        do {
+            try keychain.set(token, key: username)
+        } catch {
+            MXLog.error("Failed storing user restore token")
+        }
+    }
+    
+    func restoreTokenForUsername(_ username: String) -> String? {
+        do {
+            return try keychain.get(username)
+        } catch {
+            MXLog.error("Failed retrieving user restore token")
+            return nil
+        }
+    }
+    
+    func restoreTokens() -> [(username: String, token: String)] {
+        keychain.allKeys().compactMap { username in
+            guard let token = restoreTokenForUsername(username) else {
+                return nil
+            }
+            
+            return (username, token)
+        }
+    }
+    
+    func removeAllTokens() {
+        do {
+            try keychain.removeAll()
+        } catch {
+            MXLog.error("Failed removing all tokens")
+        }
+    }
+}