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For our new friends:

Logto is an Auth0 alternative designed for modern apps and SaaS products. It offers both Cloud and Open-source services to help you quickly launch your identity and management (IAM) system. Enjoy authentication, authorization, and multi-tenant management all in one.

We recommend starting with a free development tenant on Logto Cloud. This allows you to explore all the features easily.

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

Prerequisites

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

Create an application in Logtoโ€‹

Logto is based on OpenID Connect (OIDC) authentication and OAuth 2.0 authorization. It supports federated identity management across multiple applications, commonly called Single Sign-On (SSO).

To create your Traditional web application, simply follow these steps:

  1. Open the Logto Console. In the "Get started" section, click the "View all" link to open the application frameworks list. Alternatively, you can navigate to Logto Console > Applications, and click the "Create application" button. Get started
  2. In the opening modal, click the "Traditional web" section or filter all the available "Traditional web" frameworks using the quick filter checkboxes on the left. Click the "Flask" framework card to start creating your application. Frameworks
  3. Enter the application name, e.g., "Bookstore," and click "Create application".

๐ŸŽ‰ 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 Flask SDKโ€‹

tip:
  • The example uses Flask, but the concepts are the same for other frameworks.
  • The Python sample project is available on our Python SDK repo.
  • Logto SDK leverages coroutines, remember to use await when calling async functions.

Installationโ€‹

Execute in the project root directory:

pip install logto # or `poetry add logto` or whatever you use

Init LogtoClientโ€‹

First, create a Logto config:

client.py
from logto import LogtoClient, LogtoConfig

client = LogtoClient(
LogtoConfig(
endpoint="https://you-logto-endpoint.app", # Replace with your Logto endpoint
appId="replace-with-your-app-id",
appSecret="replace-with-your-app-secret",
),
)
tip:

You can find and copy "App Secret" from application details page in Admin Console:

App Secret

Also replace the default memory storage with a persistent storage, for example:

client.py
from logto import LogtoClient, LogtoConfig, Storage
from flask import session
from typing import Union

class SessionStorage(Storage):
def get(self, key: str) -> Union[str, None]:
return session.get(key, None)

def set(self, key: str, value: Union[str, None]) -> None:
session[key] = value

def delete(self, key: str) -> None:
session.pop(key, None)

client = LogtoClient(
LogtoConfig(...),
storage=SessionStorage(),
)

See Storage for more details.

Implement sign-in and sign-outโ€‹

In your web application, add a route to properly handle the sign-in request from users. Let's use /sign-in as an example:

flask.py
@app.route("/sign-in")
async def sign_in():
# Get the sign-in URL and redirect the user to it
return redirect(await client.signIn(
redirectUri="http://localhost:3000/callback",
))

Replace http://localhost:3000/callback with the callback URL you set in your Logto Console for this application.

If you want to show the sign-up page on the first screen, you can set interactionMode to signUp:

flask.py
@app.route("/sign-in")
async def sign_in():
return redirect(await client.signIn(
redirectUri="http://localhost:3000/callback",
interactionMode="signUp", # Show the sign-up page on the first screen
))

Now, whenever your users visit http://localhost:3000/sign-in, it will start a new sign-in attempt and redirect the user to the Logto sign-in page.

Note Creating a sign-in route isn't the only way to start a sign-in attempt. You can always use the signIn method to get the sign-in URL and redirect the user to it.

After the user makes a signing-out request, Logto will clear all user authentication information in the session.

To clean up the Python session and Logto session, a sign-out route can be implemented as follows:

flask.py
@app.route("/sign-out")
async def sign_out():
return redirect(
# Redirect the user to the home page after a successful sign-out
await client.signOut(postLogoutRedirectUri="http://localhost:3000/")
)

Handle authentication statusโ€‹

In Logto SDK, we can use client.isAuthenticated() to check the authentication status, if the user is signed in, the value will be true, otherwise, the value will be false.

Here we also implement a simple home page for demonstration:

  • If the user is not signed in, show a sign-in button;
  • If the user is signed in, show a sign-out button.
@app.route("/")
async def home():
if client.isAuthenticated() is False:
return "Not authenticated <a href='/sign-in'>Sign in</a>"
return "Authenticated <a href='/sign-out'>Sign out</a>"

Checkpoint: Test your applicationโ€‹

Now, you can test your application:

  1. Run your application, you will see the sign-in button.
  2. Click the sign-in button, the SDK will init the sign-in process and redirect you to the Logto sign-in page.
  3. After you signed in, you will be redirected back to your application and see the sign-out button.
  4. Click the sign-out button to clear token storage and sign out.

Add Naver connectorโ€‹

To enable quick sign-in and improve user conversion, connect with Flask as an identity provider. The Logto social connector helps you establish this connection in minutes by allowing several parameter inputs.

To add a social connector, simply follow these steps:

  1. Navigate to Console > Connectors > Social Connectors.
  2. Click "Add social connector" and select "Naver".
  3. Follow the README guide and complete required fields and customize settings.

Connector tab

note:

If you are following the in-place Connector guide, you can skip the next section.

Set up Naver loginโ€‹

Developer Site Only Korean Support Nowโ€‹

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

For the Productionโ€‹

  • For the production, you have to get review from Naver team. Otherwise, only registered users can sign in.
    • You can add a tester from ๋งด๋ฒ„๊ด€๋ฆฌ(Member Manage) menu.
  • To get a review, please check ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ๊ฐœ๋ฐœ ์ƒํƒœ(Application Devlopment Status) from API ์„ค์ •(API Setting) from your application project setting.

Set up a project in the Naver Developersโ€‹

  • Visit the Naver Developers and sign in with your Naver account.
  • Click the Application -> ์–ดํ”Œ๋ฆฌ์ผ€์ด์…˜ ๋“ฑ๋ก from the menu to create new project.
  • Follow the instruction below to create application.

Application Name (์–ดํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ด๋ฆ„)โ€‹

  • Type your application name on ์–ดํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ด๋ฆ„ (This name is shown while a user sign in.)

API Usage (์‚ฌ์šฉ API)โ€‹

  • Choose ๋„ค์ด๋ฒ„ ๋กœ๊ทธ์ธ(Naver Login) for ์‚ฌ์šฉ API(API Usage)
  • Check ์ด๋ฉ”์ผ ์ฃผ์†Œ(Email Address), ๋ณ„๋ช…(Nickname), ํ”„๋กœํ•„ ์‚ฌ์ง„(Profile Image) as ํ•„์ˆ˜(Neccessary) from ๊ถŒํ•œ(Role) (You can check ์ถ”๊ฐ€(Add) as optional these options, but you cannot get the information from the user.)

Sign in Open API Service Environment (๋กœ๊ทธ์ธ ์˜คํ”ˆ API ์„œ๋น„์Šค ํ™˜๊ฒฝ)โ€‹

  • For ๋กœ๊ทธ์ธ ์˜คํ”ˆ API ์„œ๋น„์Šค ํ™˜๊ฒฝ(Sign in Open API Service Environment), add two environment PC์›น(PC Web) and ๋ชจ๋ฐ”์ผ์›น(Mobile Web).

PC Web (PC ์›น)โ€‹

Mobile Web (Mobile ์›น)โ€‹

caution:

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

Configure Logtoโ€‹

Config typesโ€‹

NameType
clientIdstring
clientSecretstring

clientIdโ€‹

clientId is Client ID of your project. (You can find it from ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ •๋ณด(Application Info) of your project from Naver developers.)

clientSeceretโ€‹

clientSecret is Client Secret of your project. (You can find it from ์• ํ”Œ๋ฆฌ์ผ€์ด์…˜ ์ •๋ณด(Application Info) of your project from Naver developers.)

Save your configurationโ€‹

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 Experienceโ€‹

Once you create a social connector successfully, you can enable it as a "Continue with Naver" button in Sign-in Experience.

  1. Navigate to Console > Sign-in experience > Sign-up and sign-in.
  2. (Optional) Choose "Not applicable" for sign-up identifier if you need social login only.
  3. Add configured Naver connector to the "Social sign-in" section.

Sign-in Experience tab

Testing and Validationโ€‹

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

Further readingsโ€‹

End-user flows: Logto provides a out-of-the-box authentication flows including MFA and enterprise SSO, along with powerful APIs for flexible implementation of account settings, security verification, and multi-tenant experience.

Authorization: Authorization defines the actions a user can do or resources they can access after being authenticated. Explore how to protect your API for native and single-page applications and implement Role-based Access Control (RBAC).

Organizations: Particularly effective in multi-tenant SaaS and B2B apps, the organization feature enable tenant creation, member management, organization-level RBAC, and just-in-time-provisioning.

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