How to implement OAuth2 with Phoenix in Elixir?

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.

OAuth2 vs Ueberauth for Elixir authentication?

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.

How to refresh access tokens in OAuth2 Elixir?

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.

Configuring OAuth2 for Google API in Elixir?

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.

How to debug OAuth2 requests in Elixir?

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.

Is OAuth2 library production-ready for Elixir?

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.

oauth2 — Elixir OAuth 2.0 Client Library

What is oauth2?

OAuth2 is an Elixir client library for implementing OAuth 2.0 authorization flows in applications. It provides a clean, extensible interface for integrating with OAuth 2.0 providers, handling token management, and making authenticated API requests.

Target Audience

Elixir developers building applications that need to authenticate with external OAuth 2.0 providers like GitHub, Google, or custom authorization servers.

Value Proposition

Developers choose OAuth2 for its modular design, adherence to Elixir conventions, and built-in support for multiple grant types without imposing rigid patterns, making it straightforward to add OAuth 2.0 client capabilities.

An Elixir OAuth 2.0 Client Library

Use Cases

Best For

Implementing OAuth 2.0 authorization code flows in Elixir web applications.
Building Elixir services that require client credentials grant for machine-to-machine authentication.
Creating custom OAuth 2.0 strategies for specific providers like GitHub with extensible serialization.
Managing access token retrieval, storage, and refresh flows automatically in Elixir projects.
Integrating with OAuth 2.0 providers that use different MIME types like JSON or XML in requests and responses.
Developing Elixir applications needing flexible HTTP client configuration via Tesla adapters and middleware.

Not Ideal For

Projects requiring OAuth 2.0 server implementation, as this is a client-only library.
Applications needing implicit grant or other non-standard OAuth flows not covered by the built-in strategies.
Teams looking for pre-configured, drop-in integrations with popular providers without writing custom strategy modules.
Rapid prototyping where a higher-level, more opinionated library would reduce boilerplate code and setup time.

Pros & Cons

Pros

Multiple Grant Support

Supports Authorization Code, Password, and Client Credentials flows out of the box, covering common use cases for web and machine-to-machine authentication as highlighted in the README.

Extensible Serialization

Allows configurable serializers for different MIME types like JSON and XML, enabling easy integration with various APIs through modules that implement encode!/1 and decode!/1.

Flexible HTTP Configuration

Built on Tesla with configurable adapters and middleware, providing control over HTTP behavior and compatibility with different backends, as shown in the configuration examples.

Custom Strategy Creation

Enables developers to implement provider-specific strategies, such as for GitHub, by following a straightforward callback module pattern demonstrated in the README.

Cons

Limited Built-in Strategies

Only includes three OAuth 2.0 grant types; projects requiring implicit grant or other flows must implement custom strategies from scratch, adding development overhead.

Dependency on Tesla and Adapters

Requires explicit configuration of Tesla adapters and dependencies like Hackney, adding complexity and potential version conflicts, as noted in the installation and setup sections.

Manual Token Persistence

While it handles token retrieval and refresh, developers must manage token storage and persistence across application restarts themselves, which isn't automated by the library.

What is oauth2?

Target Audience

Elixir developers building applications that need to authenticate with external OAuth 2.0 providers like GitHub, Google, or custom authorization servers.

Value Proposition

Use Cases

Best For

Implementing OAuth 2.0 authorization code flows in Elixir web applications.
Building Elixir services that require client credentials grant for machine-to-machine authentication.
Creating custom OAuth 2.0 strategies for specific providers like GitHub with extensible serialization.
Managing access token retrieval, storage, and refresh flows automatically in Elixir projects.
Integrating with OAuth 2.0 providers that use different MIME types like JSON or XML in requests and responses.
Developing Elixir applications needing flexible HTTP client configuration via Tesla adapters and middleware.

Not Ideal For

Projects requiring OAuth 2.0 server implementation, as this is a client-only library.
Applications needing implicit grant or other non-standard OAuth flows not covered by the built-in strategies.
Teams looking for pre-configured, drop-in integrations with popular providers without writing custom strategy modules.
Rapid prototyping where a higher-level, more opinionated library would reduce boilerplate code and setup time.

Pros & Cons

Pros

Multiple Grant Support

Supports Authorization Code, Password, and Client Credentials flows out of the box, covering common use cases for web and machine-to-machine authentication as highlighted in the README.

Extensible Serialization

Allows configurable serializers for different MIME types like JSON and XML, enabling easy integration with various APIs through modules that implement encode!/1 and decode!/1.

Flexible HTTP Configuration

Built on Tesla with configurable adapters and middleware, providing control over HTTP behavior and compatibility with different backends, as shown in the configuration examples.

Custom Strategy Creation

Enables developers to implement provider-specific strategies, such as for GitHub, by following a straightforward callback module pattern demonstrated in the README.

Cons

Limited Built-in Strategies

Only includes three OAuth 2.0 grant types; projects requiring implicit grant or other flows must implement custom strategies from scratch, adding development overhead.

Dependency on Tesla and Adapters

Requires explicit configuration of Tesla adapters and dependencies like Hackney, adding complexity and potential version conflicts, as noted in the installation and setup sections.

Manual Token Persistence

While it handles token retrieval and refresh, developers must manage token storage and persistence across application restarts themselves, which isn't automated by the library.

oauth2

What is oauth2?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?

oauth2

What is oauth2?

Overview

Use Cases

Best For

Not Ideal For

Pros & Cons

Pros

Cons

Frequently Asked Questions

Related Projects

Found a gem we're missing?