For our new friends:

Every app needs authentication and authorization. Logto is an Auth0 alternative designed for modern apps and SaaS products.

In this article, we will go through the steps to quickly build the Naver sign-in experience (user authentication) with iOS Swift and  Logto.

Prerequisites

• A running Logto instance. Check out the introduction page to get started.
• Basic knowledge of iOS Swift.
• A usable Naver account.

Create an application in Logto

In you browser, open a new tab and enter the link of Logto Admin Console.

Once the page is loaded, in the "Get Started" section click the View all link to open the application framework list page.

Choose your application type

In the opening modal, scroll to the "Native app" section or filter all the available " Native app" frameworks using the quick filter checkboxes on the left.

Click the "iOS(Swift)" framework card to start creating your application.

Enter application name

Enter the application name, e.g., "Bookstore," and click "Create application."

🎉 Ta-da! You just created your first application in Logto. You'll see a congrats page which includes a detailed integration guide. Follow the guide to see what the experience will be in your application.

Integrate Logto SDK

Add Logto SDK as a dependency

Use the following URL to add Logto SDK as a dependency in Swift Package Manager.

https://github.com/logto-io/swift.git

Since Xcode 11, you can directly import a Swift package w/o any additional tool.

We do not support Carthage and CocoaPods at the time due to some technical issues.

Carthage

Carthage needs a xcodeproj file to build, but swift package generate-xcodeproj will report a failure since we are using binary targets for native social plugins. We will try to find a workaround later.

CocoaPods

CocoaPods does not support local dependency and monorepo, thus it's hard to create a .podspec for this repo.

Init LogtoClient

Initialize the client by creating a LogtoClient instance with a LogtoConfig object.

ContentView.swift

import Logto
import LogtoClient

let config = try? LogtoConfig(
  endpoint: "<your-logto-endpoint>", // E.g. http://localhost:3001
  appId: "<your-app-id>"
)
let client = LogtoClient(useConfig: config)

info:

By default, we store credentials like ID Token and Refresh Token in the Keychain. Thus the user doesn't need to sign in again when he returns.

To turn off this behavior, set usingPersistStorage to false:

let config = try? LogtoConfig(
  // ...
  usingPersistStorage: false
)

Sign in

Before we dive into the details, here's a quick overview of the end-user experience. The sign-in process can be simplified as follows:

1. Your app invokes the sign-in method.
2. The user is redirected to the Logto sign-in page. For native apps, the system browser is opened.
3. The user signs in and is redirected back to your app (configured as the redirect URI).

Regarding redirect-based sign-in

1. This authentication process follows the OpenID Connect (OIDC) protocol, and Logto enforces strict security measures to protect user sign-in.
2. If you have multiple apps, you can use the same identity provider (Logto). Once the user signs in to one app, Logto will automatically complete the sign-in process when the user accesses another app.

To learn more about the rationale and benefits of redirect-based sign-in, see Logto sign-in experience explained.

---

Configure redirect URI

Let's switch to the Application details page of Logto Console. Add a Redirect URI io.logto://callback and click "Save changes".

info:

The Redirect URI in iOS SDK is only for internal use. There's NO NEED to add a Custom URL Scheme until a connector asks.

Sign-in and sign-out

nota:

Before calling .signInWithBrowser(redirectUri:), make sure you have correctly configured Redirect URI in Admin Console.

You can use client.signInWithBrowser(redirectUri:) to sign in the user and client.signOut() to sign out the user.

For example, in a SwiftUI app:

ContentView.swift

struct ContentView: View {
  @State var isAuthenticated: Bool

  init() {
    isAuthenticated = client.isAuthenticated
  }

  var body: some View {
    VStack {
      if isAuthenticated {
        Button("Sign Out") {
          Task { [self] in
            await client.signOut()
            isAuthenticated = false
          }
        }
      } else {
        Button("Sign In") {
          Task { [self] in
            do {
              try await client.signInWithBrowser(redirectUri: "${
                props.redirectUris[0] ?? 'io.logto://callback'
              }")
              isAuthenticated = true
            } catch let error as LogtoClientErrors.SignIn {
              // error occured during sign in
            } catch {
              // other errors
            }
          }
        }
      }
    }
  }
}

Test your integration:

Open your iOS app to test if the integration works. When you click the "Sign In" button, the page should be redirected to a Logto sign-in page, and you should be able to create a new account by entering username and password and complete the sign-in process.

Add Naver connector

To add a social connector, go to the "Connector" tab in the Admin Console, then click on "Social connectors". From there, click "Add social connector".

In the openning modal, select "Naver" and click "Next".

On the next page, you will see a two-column layout with the README content on the left and configuration on the right.

Feel free to follow the README file in place or read the following section to complete the configuration process. If you follow the in-place guide, you can skip the next section.

Set up Naver login

Developer Site Only Korean Support Now

Currently Naver Developers site only supports Korean. Please consider use a translator.

For the Production

• For the production, you have to get review from Naver team. Otherwise, only registered users can sign in.
  • You can add a tester from 맴버관리(Member Manage) menu.
• To get a review, please check 애플리케이션 개발 상태(Application Devlopment Status) from API 설정(API Setting) from your application project setting.

Set up a project in the Naver Developers

• Visit the Naver Developers and sign in with your Naver account.
• Click the Application -> 어플리케이션 등록 from the menu to create new project.
• Follow the instruction below to create application.

Application Name (어플리케이션 이름)

• Type your application name on 어플리케이션 이름 (This name is shown while a user sign in.)

API Usage (사용 API)

• Choose 네이버 로그인(Naver Login) for 사용 API(API Usage)
• Check 이메일 주소(Email Address), 별명(Nickname), 프로필 사진(Profile Image) as 필수(Neccessary) from 권한(Role) (You can check 추가(Add) as optional these options, but you cannot get the information from the user.)

Sign in Open API Service Environment (로그인 오픈 API 서비스 환경)

• For 로그인 오픈 API 서비스 환경(Sign in Open API Service Environment), add two environment PC웹(PC Web) and 모바일웹(Mobile Web).

PC Web (PC 웹)

• For 서비스 URL(Service URL), type http(s)://YOUR_URL (ex. https://logto.io)
• For 네이버 로그인(Naver Login) Callback URL, type http(s)://YOUR_URL/callback/connector_id (e.g. https://logto.io/callback/connector_id)

Mobile Web (Mobile 웹)

• For 서비스 URL(Service URL), type http(s)://YOUR_URL (ex. https://logto.io)
• For 네이버 로그인(Naver Login) Callback URL, type http(s)://YOUR_URL/callback/connector_id (e.g. https://logto.io/callback/connector_id)

⚠️ Caution

The connector_id can be found on the top bar of the Logto Admin Console connector details page.

Configure Logto

Config types

Name	Type
clientId	string
clientSecret	string

clientId

clientId is Client ID of your project. (You can find it from 애플리케이션 정보(Application Info) of your project from Naver developers.)

clientSeceret

clientSecret is Client Secret of your project. (You can find it from 애플리케이션 정보(Application Info) of your project from Naver developers.)

Save your configuration

Double check you have filled out necessary values in the Logto connector configuration area. Click "Save and Done" (or "Save changes") and the Naver connector should be available now.

Enable Naver connector in Sign-in Experience

Switch to the "Sign-in experience" tab, then click the "Sign-up and sign-in" tab.

nota:

If it's the first time you enter the tab, you will see a quick introduction about Sign-in Experience and its basic configuration.

Select "None" for the "Sign-up identifier" to provide minimum sign-up effort for Naver sign-in, which may increase your conversion rate.

In the "Social sign-in" section, add "Add Social Connector" and choose "Naver". Then you should be able to see a button with text "Continue with Naver" in the preview section.

Finally, click "Save changes" on the bottom right corner.

Testing and Validation

Return to your iOS Swift app. You should now be able to sign in with Naver. Enjoy!

Further readings

Protect your API For native and single page apps, you'll need to call one or more API endpoints to retrieve and update data.
Learn more about identifying who's who and keeping your API secure.

User management We know you care about user management and activities, as we also do.
Learn more about how to know your users and see the figures like DAU and MAU graphically.

Localization From one regional business to a global corporate, the willingness to offer the best user experience won't change.
You can change current language phrases or add a new language without friction.

Customer IAM series Our serial blog posts about Customer (or Consumer) Identity and Access Management, from 101 to advanced topics and beyond.