Nextcloud Login refactoring

Nextcloud Cookbook iOS Client/Data/AuthManager.swift

@@ -0,0 +1,44 @@
+//
+//  AuthManager.swift
+//  Nextcloud Cookbook iOS Client
+//
+//  Created by Vincent Meilinger on 30.05.25.
+//
+
+import Foundation
+import KeychainSwift
+
+class AuthManager {
+    static let shared = AuthManager()
+    let keychain = KeychainSwift()
+    
+    var authString: String? = nil
+    
+    private let nextcloudUsernameKey = "nextcloud_username"
+    private let nextcloudAuthStringKey = "nextcloud_auth_string" // Stored as base64
+    
+    func saveNextcloudCredentials(username: String, appPassword: String) {
+        keychain.set(username, forKey: nextcloudUsernameKey)
+
+        let loginString = "\(username):\(appPassword)"
+        if let loginData = loginString.data(using: .utf8) {
+            keychain.set(loginData.base64EncodedString(), forKey: nextcloudAuthStringKey)
+        }
+    }
+
+    func getNextcloudCredentials() -> (username: String?, authString: String?) {
+        let username = keychain.get(nextcloudUsernameKey)
+        let authString = keychain.get(nextcloudAuthStringKey)
+        
+        return (username, authString)
+    }
+    
+    func loadAuthString() {
+        authString = keychain.get(nextcloudAuthStringKey)
+    }
+    
+    func deleteNextcloudCredentials() {
+        keychain.delete(nextcloudUsernameKey)
+        keychain.delete(nextcloudAuthStringKey)
+    }
+}