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diff --git a/lesson7/Main.swift b/lesson7/Main.swift
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+//
+//  main.swift
+//  lesson7
+//
+//  Created by Vladislav Elkin on 05.08.2020.
+//  Copyright © 2020 Vladislav Elkin. All rights reserved.
+//
+
+import Foundation
+
+enum AuthorizationError: Error, CustomStringConvertible {
+    case userNotFound
+    case invalidLoginOrPassword
+    case userBlocked
+    
+    var description: String {
+    switch self {
+    case .invalidLoginOrPassword:
+        return "Неправильный логин или пароль"
+    case .userBlocked:
+        return "Юзер заблокирован"
+    case .userNotFound:
+        return "Юзер не найден"
+    }
+  }
+}
+
+enum RegistrationError: Error {
+    case userExists
+}
+
+struct User
+{
+    var login: String
+    var password: String
+    var isBlocked: Bool
+    
+}
+
+class Site
+{
+    var users = [
+        "123@mail.ru": User(login: "123@mail.ru", password: "123123", isBlocked: false),
+        "user@gmail.com": User(login: "user@gmail.com", password: "admin", isBlocked: false),
+        "root@site.ru": User(login: "root@site.ru", password: "qwerty", isBlocked: true)
+    ]
+    
+    func login(_ username: String, _ password: String) throws -> Bool
+    {
+        guard let user = users[username] else {
+            throw AuthorizationError.userNotFound
+        }
+        
+        if user.isBlocked {
+            throw AuthorizationError.userBlocked
+        }
+        
+        if user.login == username && user.password == password {
+            return true
+        } else {
+            throw AuthorizationError.invalidLoginOrPassword
+        }
+        
+    }
+    
+    func register(username: String, password: String) throws -> Bool
+    {
+        if let user = users[username]  {
+            throw RegistrationError.userExists
+        }
+        
+        users[username] = User(login: username, password: password, isBlocked: false)
+        
+        return true
+    }
+}
+
+var site = Site()
+
+do {
+    var success = try site.register(username: "newuser@mail.ru", password: "9999")
+    print(success)
+    success = try site.login("newuser@mail.ru", "97999")
+    print(success)
+}
+catch RegistrationError.userExists {
+    print("Юзер с таким именем уже зарегистрирован")
+} catch let userError as AuthorizationError
+{
+    print(userError.description)
+}
+
+