0. Content
This guide is specific for those developing apps with Firebase (Google Cloud also works directly, but I will continue to refer to Firebase) and having Firebase handle authentication.
Kakao is much easier to integrate than Naver, because both Flutterfire and Kakao support OIDC (an extension of OAuth).
1. Add Application, enable Login and OIDC
- Go to https://developers.kakao.com/, log in, click My Application and create a new app
- Click Kakao Login, then enable both "Kakao Login Activation" and "OpenID Connect Activation"
- In Redirect URI, enter the URL "https://your-firebase-project-id.firebaseapp.com/__/auth/handler"
- On the left hand side, click Security, then generate a Client secret code.
- This is the "Client Secret" we will use in the next step
2. Add Kakao as an Authentication Provider
- Go to https://console.firebase.google.com/u/0/project/_/authentication/providers, select your project, click Add New Provider > OpenID Connect
- Set the Name to "Kakao"
- For the Client ID, copy the "REST API Key" from the Summary page of your App on developers.kakao.com
- Set the Issuer (URL) to https://kauth.kakao.com/
- Set the Client Secret to the secret you made in the Security section of your App on developers.kakao.com
3. Write the Flutter code
final provider = OAuthProvider('oidc.kakao');
UserCredential kakaoUser = await FirebaseAuth.instance.signInWithProvider(provider);
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