Question 1

How to implement OAuth2 with Phoenix in Elixir?

Accepted Answer

The library provides a GitHub strategy example in the README, and there's a linked example project for authenticating with GitHub in a Phoenix application. You'll need to define a custom strategy module and integrate it with your Phoenix routes and controllers for callback handling.

Question 2

OAuth2 vs Ueberauth for Elixir authentication?

Accepted Answer

OAuth2 is a lower-level client library focused on OAuth 2.0 flows, offering modularity and extensibility for custom integrations. Ueberauth is a higher-level framework with more out-of-the-box provider strategies, making it better for quick setups but less flexible for unique OAuth requirements.

Question 3

How to refresh access tokens in OAuth2 Elixir?

Accepted Answer

Use the OAuth2.Strategy.Refresh by initializing a new client with the refresh token, as shown in the README. Call get_token! on this client to automatically obtain a new access token, with the refreshed token stored in the client struct.

Question 4

Configuring OAuth2 for Google API in Elixir?

Accepted Answer

Create a custom strategy similar to the GitHub example, setting the site, authorize_url, and token_url to Google's OAuth endpoints (e.g., https://accounts.google.com). Configure serializers for JSON, and ensure proper scopes and redirect URIs are specified in the client setup.

Question 5

How to debug OAuth2 requests in Elixir?

Accepted Answer

Enable debug mode by setting config :oauth2, debug: true, which outputs response details to logs. You can also add Tesla middleware for more granular logging or use tools like IEx to inspect client and token states during development.

Question 6

Is OAuth2 library production-ready for Elixir?

Accepted Answer

Yes, it has a stable release (~> 2.0), good test coverage with CI badges, and is used in production by various projects. However, ensure thorough testing for your specific OAuth provider and handle errors gracefully, as the library provides basic error handling via response patterns.

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