oauth2

OAuth 2.0 Logo by Chris Messina, CC BY-SA 3.0 Yukihiro Matsumoto, Ruby Visual Identity Team, CC BY-SA 2.5

🔐 OAuth2

Version License: MIT Downloads Rank Open Source Helpers Depfu Coveralls Test Coverage QLTY Test Coverage QLTY Maintainability CI Heads CI Runtime Dependencies @ HEAD CI Current CI Truffle Ruby CI JRuby CI Supported CI Legacy CI Unsupported CI Ancient CI Caboose is an absolute WAGON CI Test Coverage CI Style CodeQL

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OAuth 2.0 is the industry-standard protocol for authorization. OAuth 2.0 focuses on client developer simplicity while providing specific authorization flows for web applications, desktop applications, mobile phones, and living room devices. This is a RubyGem for implementing OAuth 2.0 clients (not servers) in Ruby applications.

Federated DVCS Repository Status Issues PRs Wiki CI Discussions
🧪 oauth-xx/oauth2 on GitLab The Truth 💚 💚 💚 🏀 Tiny Matrix ➖
🧊 oauth-xx/oauth2 on CodeBerg An Ethical Mirror (Donate) ➖ 💚 ➖ ⭕️ No Matrix ➖
🐙 oauth-xx/oauth2 on GitHub A Dirty Mirror 💚 💚 ➖ 💯 Full Matrix ➖
🤼 OAuth Ruby Google Group “Active” ➖ ➖ ➖ ➖ 💚
🎮️ Discord Server Live Chat on Discord Let’s talk about this library!

Upgrading Runtime Gem Dependencies

This project sits underneath a large portion of the authorization systems on the internet. According to GitHub’s project tracking, which I believe only reports on public projects, 100,000+ projects, and 500+ packages depend on this project.

That means it is painful for the Ruby community when this gem forces updates to its runtime dependencies.

As a result, great care, and a lot of time, have been invested to ensure this gem is working with all the leading versions per each minor version of Ruby of all the runtime dependencies it can install with.

What does that mean specifically for the runtime dependencies?

We have 100% test coverage of lines and branches, and this test suite runs across a large matrix covering the latest patch for each of the following minor versions:

The last two were extracted from this gem. They are part of the oauth-xx org, and are developed in tight collaboration with this gem.

Also, where reasonable, tested against the runtime dependencies of those dependencies:

You should upgrade this gem with confidence*.

* MIT license; I am unable to make guarantees.

🚚 Test matrix brought to you by 🔎 appraisal++
Adds back support for old Rubies ✨ appraisal PR #250
Adds support for eval_gemfile ✨ appraisal PR #248
Please review my PRs!
Standard Library Dependencies The various versions of each are tested via the Ruby test matrix, along with whatever Ruby includes them. * base64 * cgi * json * time * logger (removed from stdlib in Ruby 3.5 so added as runtime dependency in v2.0.10) If you use a gem version it should work fine!

Quick Usage Example for AI and Copy / Pasting

Convert the following curl command into a token request using this gem…

curl --request POST \
  --url 'https://login.microsoftonline.com/REDMOND_REDACTED/oauth2/token' \
  --header 'content-type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data client_id=REDMOND_CLIENT_ID \
  --data client_secret=REDMOND_CLIENT_SECRET \
  --data resource=REDMOND_RESOURCE_UUID

NOTE: In the ruby version below, certain params are passed to the get_token call, instead of the client creation.

OAuth2::Client.new(
  "REDMOND_CLIENT_ID", # client_id
  "REDMOND_CLIENT_SECRET", # client_secret
  auth_scheme: :request_body, # Other modes are supported: :basic_auth, :tls_client_auth, :private_key_jwt
  token_url: "oauth2/token", # relative path, except with leading `/`, then absolute path
  site: "https://login.microsoftonline.com/REDMOND_REDACTED",
). # The base path for token_url when it is relative
  client_credentials. # There are many other types to choose from!
  get_token(resource: "REDMOND_RESOURCE_UUID")

NOTE: header - The content type specified in the curl is already the default!

If any of the above makes you uncomfortable, you may be in the wrong place. One of these might be what you are looking for:

💡 Info you can shake a stick at

Tokens to Remember Gem name Gem namespace
Works with JRuby JRuby 9.2 Compat JRuby 9.3 Compat JRuby 9.4 Compat JRuby 10.0 Compat JRuby HEAD Compat
Works with Truffle Ruby Truffle Ruby 23.1 Compat Truffle Ruby 24.1 Compat Truffle Ruby HEAD Compat
Works with MRI Ruby 3 Ruby 3.0 Compat Ruby 3.1 Compat Ruby 3.2 Compat Ruby 3.3 Compat Ruby 3.4 Compat Ruby HEAD Compat
Works with MRI Ruby 2 Ruby 2.3 Compat Ruby 2.4 Compat Ruby 2.5 Compat Ruby 2.6 Compat Ruby 2.7 Compat
Source Source on GitLab.com Source on CodeBerg.org Source on Github.com The best SHA: dQw4w9WgXcQ!
Documentation Discussion Current release on RubyDoc.info HEAD on RubyDoc.info BDFL Blog Wiki
Compliance License: MIT 📄ilo-declaration-img Security Policy Contributor Covenant 2.1 SemVer 2.0.0
Style Enforced Code Style Linter Keep-A-Changelog 1.0.0 Gitmoji Commits
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🚀 Release Documentation

Version 2.0.x

2.0.x CHANGELOGs and READMEs | Version | Release Date | CHANGELOG | README | |---------|--------------|---------------------------------------|---------------------------------| | 2.0.11 | 2025-05-23 | [v2.0.11 CHANGELOG][2.0.11-changelog] | [v2.0.10 README][2.0.11-readme] | | 2.0.10 | 2025-05-17 | [v2.0.10 CHANGELOG][2.0.10-changelog] | [v2.0.10 README][2.0.10-readme] | | 2.0.9 | 2022-09-16 | [v2.0.9 CHANGELOG][2.0.9-changelog] | [v2.0.9 README][2.0.9-readme] | | 2.0.8 | 2022-09-01 | [v2.0.8 CHANGELOG][2.0.8-changelog] | [v2.0.8 README][2.0.8-readme] | | 2.0.7 | 2022-08-22 | [v2.0.7 CHANGELOG][2.0.7-changelog] | [v2.0.7 README][2.0.7-readme] | | 2.0.6 | 2022-07-13 | [v2.0.6 CHANGELOG][2.0.6-changelog] | [v2.0.6 README][2.0.6-readme] | | 2.0.5 | 2022-07-07 | [v2.0.5 CHANGELOG][2.0.5-changelog] | [v2.0.5 README][2.0.5-readme] | | 2.0.4 | 2022-07-01 | [v2.0.4 CHANGELOG][2.0.4-changelog] | [v2.0.4 README][2.0.4-readme] | | 2.0.3 | 2022-06-28 | [v2.0.3 CHANGELOG][2.0.3-changelog] | [v2.0.3 README][2.0.3-readme] | | 2.0.2 | 2022-06-24 | [v2.0.2 CHANGELOG][2.0.2-changelog] | [v2.0.2 README][2.0.2-readme] | | 2.0.1 | 2022-06-22 | [v2.0.1 CHANGELOG][2.0.1-changelog] | [v2.0.1 README][2.0.1-readme] | | 2.0.0 | 2022-06-21 | [v2.0.0 CHANGELOG][2.0.0-changelog] | [v2.0.0 README][2.0.0-readme] |

Older Releases

1.4.x CHANGELOGs and READMEs | Version | Release Date | CHANGELOG | README | |---------|--------------|---------------------------------------|---------------------------------| | 1.4.11 | Sep 16, 2022 | [v1.4.11 CHANGELOG][1.4.11-changelog] | [v1.4.11 README][1.4.11-readme] | | 1.4.10 | Jul 1, 2022 | [v1.4.10 CHANGELOG][1.4.10-changelog] | [v1.4.10 README][1.4.10-readme] | | 1.4.9 | Feb 20, 2022 | [v1.4.9 CHANGELOG][1.4.9-changelog] | [v1.4.9 README][1.4.9-readme] | | 1.4.8 | Feb 18, 2022 | [v1.4.8 CHANGELOG][1.4.8-changelog] | [v1.4.8 README][1.4.8-readme] | | 1.4.7 | Mar 19, 2021 | [v1.4.7 CHANGELOG][1.4.7-changelog] | [v1.4.7 README][1.4.7-readme] | | 1.4.6 | Mar 19, 2021 | [v1.4.6 CHANGELOG][1.4.6-changelog] | [v1.4.6 README][1.4.6-readme] | | 1.4.5 | Mar 18, 2021 | [v1.4.5 CHANGELOG][1.4.5-changelog] | [v1.4.5 README][1.4.5-readme] | | 1.4.4 | Feb 12, 2020 | [v1.4.4 CHANGELOG][1.4.4-changelog] | [v1.4.4 README][1.4.4-readme] | | 1.4.3 | Jan 29, 2020 | [v1.4.3 CHANGELOG][1.4.3-changelog] | [v1.4.3 README][1.4.3-readme] | | 1.4.2 | Oct 1, 2019 | [v1.4.2 CHANGELOG][1.4.2-changelog] | [v1.4.2 README][1.4.2-readme] | | 1.4.1 | Oct 13, 2018 | [v1.4.1 CHANGELOG][1.4.1-changelog] | [v1.4.1 README][1.4.1-readme] | | 1.4.0 | Jun 9, 2017 | [v1.4.0 CHANGELOG][1.4.0-changelog] | [v1.4.0 README][1.4.0-readme] |
1.3.x Readmes | Version | Release Date | Readme | |----------|--------------|----------------------------------------------------------| | 1.3.1 | Mar 3, 2017 | https://gitlab.com/oauth-xx/oauth2/-/blob/v1.3.1/README.md | | 1.3.0 | Dec 27, 2016 | https://gitlab.com/oauth-xx/oauth2/-/blob/v1.3.0/README.md |
≤= 1.2.x Readmes (2016 and before) | Version | Release Date | Readme | |----------|--------------|----------------------------------------------------------| | 1.2.0 | Jun 30, 2016 | https://gitlab.com/oauth-xx/oauth2/-/blob/v1.2.0/README.md | | 1.1.0 | Jan 30, 2016 | https://gitlab.com/oauth-xx/oauth2/-/blob/v1.1.0/README.md | | 1.0.0 | May 23, 2014 | https://gitlab.com/oauth-xx/oauth2/-/blob/v1.0.0/README.md | | < 1.0.0 | Find here | https://gitlab.com/oauth-xx/oauth2/-/tags |

✨ Installation

Install the gem and add to the application’s Gemfile by executing:

$ bundle add oauth2

If bundler is not being used to manage dependencies, install the gem by executing:

$ gem install oauth2

🔒 Secure Installation

oauth2 is cryptographically signed, and has verifiable SHA-256 and SHA-512 checksums by stone_checksums. Be sure the gem you install hasn’t been tampered with by following the instructions below.

Add my public key (if you haven’t already, expires 2045-04-29) as a trusted certificate:

gem cert --add <(curl -Ls https://raw.github.com/oauth-xx/oauth2/main/certs/pboling.pem)

You only need to do that once. Then proceed to install with:

gem install oauth2 -P MediumSecurity

The MediumSecurity trust profile will verify signed gems, but allow the installation of unsigned dependencies.

This is necessary because not all of oauth2’s dependencies are signed, so we cannot use HighSecurity.

If you want to up your security game full-time:

bundle config set --global trust-policy MediumSecurity

NOTE: Be prepared to track down certs for signed gems and add them the same way you added mine.

OAuth2 for Enterprise

Available as part of the Tidelift Subscription.

The maintainers of this and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source packages you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact packages you use. Learn more.

Security contact information

To report a security vulnerability, please use the Tidelift security contact. Tidelift will coordinate the fix and disclosure.

For more see SECURITY.md.

What is new for v2.0?

Compatibility

Targeted ruby compatibility is non-EOL versions of Ruby, currently 3.2, 3.3, and 3.4. Compatibility is further distinguished as “Best Effort Support” or “Incidental Support” for older versions of Ruby. This gem will install on Ruby versions >= v2.2 for 2.x releases. See 1-4-stable branch for older rubies.

Ruby Engine Compatibility Policy This gem is tested against MRI, JRuby, and Truffleruby. Each of those has varying versions that target a specific version of MRI Ruby. This gem should work in the just-listed Ruby engines according to the targeted MRI compatibility in the table below. If you would like to add support for additional engines, see [gemfiles/README.md](/gemfiles/), then submit a PR to the correct maintenance branch as according to the table below.
Ruby Version Compatibility Policy If something doesn't work on one of these interpreters, it's a bug. This library may inadvertently work (or seem to work) on other Ruby implementations, however support will only be provided for the versions listed above. If you would like this library to support another Ruby version, you may volunteer to be a maintainer. Being a maintainer entails making sure all tests run and pass on that implementation. When something breaks on your implementation, you will be responsible for providing patches in a timely fashion. If critical issues for a particular implementation exist at the time of a major release, support for that Ruby version may be dropped.
  Ruby OAuth2 Version Maintenance Branch Targeted Support Best Effort Support Incidental Support
1️⃣ 2.0.x main 3.2, 3.3, 3.4 2.5, 2.6, 2.7, 3.0, 3.1 2.2, 2.3, 2.4
2️⃣ 1.4.x 1-4-stable 3.2, 3.3, 3.4 2.5, 2.6, 2.7, 3.0, 3.1 1.9, 2.0, 2.1, 2.2, 2.3, 2.4
3️⃣ older N/A Best of luck to you! Please upgrade!  

NOTE: The 1.4 series will only receive critical security updates. See SECURITY.md.

🔧 Basic Usage

Global Configuration

You can turn on additional warnings.

OAuth2.configure do |config|
  # Turn on a warning like:
  #   OAuth2::AccessToken.from_hash: `hash` contained more than one 'token' key
  config.silence_extra_tokens_warning = false # default: true
  # Set to true if you want to also show warnings about no tokens
  config.silence_no_tokens_warning = false # default: true,
end

The “extra tokens” problem comes from ambiguity in the spec about which token is the right token. Some OAuth 2.0 standards legitimately have multiple tokens. You may need to subclass OAuth2::AccessToken, or write your own custom alternative to it, and pass it in. Specify your custom class with the access_token_class option.

If you only need one token you can, as of v2.0.10, specify the exact token name you want to extract via the OAuth2::AccessToken using the token_name option.

You’ll likely need to do some source diving. This gem has 100% test coverage for lines and branches, so the specs are a great place to look for ideas. If you have time and energy please contribute to the documentation!

authorize_url and token_url are on site root (Just Works!)

require "oauth2"
client = OAuth2::Client.new("client_id", "client_secret", site: "https://example.org")
# => #<OAuth2::Client:0x00000001204c8288 @id="client_id", @secret="client_sec...
client.auth_code.authorize_url(redirect_uri: "http://localhost:8080/oauth2/callback")
# => "https://example.org/oauth/authorize?client_id=client_id&redirect_uri=http%3A%2F%2Flocalhost%3A8080%2Foauth2%2Fcallback&response_type=code"

access = client.auth_code.get_token("authorization_code_value", redirect_uri: "http://localhost:8080/oauth2/callback", headers: {"Authorization" => "Basic some_password"})
response = access.get("/api/resource", params: {"query_foo" => "bar"})
response.class.name
# => OAuth2::Response

Relative authorize_url and token_url (Not on site root, Just Works!)

In above example, the default Authorization URL is oauth/authorize and default Access Token URL is oauth/token, and, as they are missing a leading /, both are relative.

client = OAuth2::Client.new("client_id", "client_secret", site: "https://example.org/nested/directory/on/your/server")
# => #<OAuth2::Client:0x00000001204c8288 @id="client_id", @secret="client_sec...
client.auth_code.authorize_url(redirect_uri: "http://localhost:8080/oauth2/callback")
# => "https://example.org/nested/directory/on/your/server/oauth/authorize?client_id=client_id&redirect_uri=http%3A%2F%2Flocalhost%3A8080%2Foauth2%2Fcallback&response_type=code"

Customize authorize_url and token_url

You can specify custom URLs for authorization and access token, and when using a leading / they will not be relative, as shown below:

client = OAuth2::Client.new(
  "client_id",
  "client_secret",
  site: "https://example.org/nested/directory/on/your/server",
  authorize_url: "/jaunty/authorize/",
  token_url: "/stirrups/access_token",
)
# => #<OAuth2::Client:0x00000001204c8288 @id="client_id", @secret="client_sec...
client.auth_code.authorize_url(redirect_uri: "http://localhost:8080/oauth2/callback")
# => "https://example.org/jaunty/authorize/?client_id=client_id&redirect_uri=http%3A%2F%2Flocalhost%3A8080%2Foauth2%2Fcallback&response_type=code"
client.class.name
# => OAuth2::Client

snake_case and indifferent access in Response#parsed

response = access.get("/api/resource", params: {"query_foo" => "bar"})
# Even if the actual response is CamelCase. it will be made available as snaky:
JSON.parse(response.body)         # => {"accessToken"=>"aaaaaaaa", "additionalData"=>"additional"}
response.parsed                   # => {"access_token"=>"aaaaaaaa", "additional_data"=>"additional"}
response.parsed.access_token      # => "aaaaaaaa"
response.parsed[:access_token]    # => "aaaaaaaa"
response.parsed.additional_data   # => "additional"
response.parsed[:additional_data] # => "additional"
response.parsed.class.name        # => SnakyHash::StringKeyed (from snaky_hash gem)

Serialization

As of v2.0.11, if you need to serialize the parsed result, you can!

There are two ways to do this, and the second option recommended.

  1. Globally configure SnakyHash::StringKeyed to use the serializer. Put this in your code somewhere reasonable (like an initializer for Rails):
SnakyHash::StringKeyed.class_eval do
  extend SnakyHash::Serializer
end

What if I hate snakes and/or indifference?

response = access.get("/api/resource", params: {"query_foo" => "bar"}, snaky: false)
JSON.parse(response.body)         # => {"accessToken"=>"aaaaaaaa", "additionalData"=>"additional"}
response.parsed                   # => {"accessToken"=>"aaaaaaaa", "additionalData"=>"additional"}
response.parsed["accessToken"]    # => "aaaaaaaa"
response.parsed["additionalData"] # => "additional"
response.parsed.class.name        # => Hash (just, regular old Hash)
Debugging & Logging Set an environment variable as per usual (e.g. with [dotenv](https://github.com/bkeepers/dotenv)). ```ruby # will log both request and response, including bodies ENV["OAUTH_DEBUG"] = "true" ``` By default, debug output will go to `$stdout`. This can be overridden when initializing your OAuth2::Client. ```ruby require "oauth2" client = OAuth2::Client.new( "client_id", "client_secret", site: "https://example.org", logger: Logger.new("example.log", "weekly"), ) ```

OAuth2::Response

The AccessToken methods #get, #post, #put and #delete and the generic #request will return an instance of the #OAuth2::Response class.

This instance contains a #parsed method that will parse the response body and return a Hash-like SnakyHash::StringKeyed if the Content-Type is application/x-www-form-urlencoded or if the body is a JSON object. It will return an Array if the body is a JSON array. Otherwise, it will return the original body string.

The original response body, headers, and status can be accessed via their respective methods.

OAuth2::AccessToken

If you have an existing Access Token for a user, you can initialize an instance using various class methods including the standard new, from_hash (if you have a hash of the values), or from_kvform (if you have an application/x-www-form-urlencoded encoded string of the values).

OAuth2::Error

On 400+ status code responses, an OAuth2::Error will be raised. If it is a standard OAuth2 error response, the body will be parsed and #code and #description will contain the values provided from the error and error_description parameters. The #response property of OAuth2::Error will always contain the OAuth2::Response instance.

If you do not want an error to be raised, you may use :raise_errors => false option on initialization of the client. In this case the OAuth2::Response instance will be returned as usual and on 400+ status code responses, the Response instance will contain the OAuth2::Error instance.

Authorization Grants

Currently, the Authorization Code, Implicit, Resource Owner Password Credentials, Client Credentials, and Assertion authentication grant types have helper strategy classes that simplify client use. They are available via the #auth_code, #implicit, #password, #client_credentials, and #assertion methods respectively.

These aren’t full examples, but demonstrative of the differences between usage for each strategy.

auth_url = client.auth_code.authorize_url(redirect_uri: "http://localhost:8080/oauth/callback")
access = client.auth_code.get_token("code_value", redirect_uri: "http://localhost:8080/oauth/callback")

auth_url = client.implicit.authorize_url(redirect_uri: "http://localhost:8080/oauth/callback")
# get the token params in the callback and
access = OAuth2::AccessToken.from_kvform(client, query_string)

access = client.password.get_token("username", "password")

access = client.client_credentials.get_token

# Client Assertion Strategy
# see: https://tools.ietf.org/html/rfc7523
claimset = {
  iss: "http://localhost:3001",
  aud: "http://localhost:8080/oauth2/token",
  sub: "me@example.com",
  exp: Time.now.utc.to_i + 3600,
}
assertion_params = [claimset, "HS256", "secret_key"]
access = client.assertion.get_token(assertion_params)

# The `access` (i.e. access token) is then used like so:
access.token # actual access_token string, if you need it somewhere
access.get("/api/stuff") # making api calls with access token

If you want to specify additional headers to be sent out with the request, add a ‘headers’ hash under ‘params’:

access = client.auth_code.get_token("code_value", redirect_uri: "http://localhost:8080/oauth/callback", headers: {"Some" => "Header"})

You can always use the #request method on the OAuth2::Client instance to make requests for tokens for any Authentication grant type.

🚀 Release Instructions

See CONTRIBUTING.md.

🔐 Security

See SECURITY.md.

🤝 Contributing

If you need some ideas of where to help, you could work on adding more code coverage, or if it is already 💯 (see below) check issues, or PRs, or use the gem and think about how it could be better.

We Keep A Changelog so if you make changes, remember to update it.

See CONTRIBUTING.md for more detailed instructions.

Code Coverage

Coveralls Test Coverage QLTY Test Coverage

🪇 Code of Conduct

Everyone interacting in this project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the Contributor Covenant 2.1.

🌈 Contributors

Contributors

Made with contributors-img.

Also see GitLab Contributors: https://gitlab.com/oauth-xx/oauth2/-/graphs/main

⭐️ Star History

Star History Chart

</a>

📌 Versioning

This Library adheres to Semantic Versioning 2.0.0. Violations of this scheme should be reported as bugs. Specifically, if a minor or patch version is released that breaks backward compatibility, a new version should be immediately released that restores compatibility. Breaking changes to the public API will only be introduced with new major versions.

📌 Is “Platform Support” part of the public API?

Yes. But I’m obligated to include notes…

SemVer should, but doesn’t explicitly, say that dropping support for specific Platforms is a breaking change to an API. It is obvious to many, but not all, and since the spec is silent, the bike shedding is endless.

dropping support for a platform is both obviously and objectively a breaking change

To get a better understanding of how SemVer is intended to work over a project’s lifetime, read this article from the creator of SemVer:

As a result of this policy, and the interpretive lens used by the maintainer, you can (and should) specify a dependency on these libraries using the Pessimistic Version Constraint with two digits of precision.

For example:

spec.add_dependency("oauth2", "~> 2.0")

See CHANGELOG.md for list of releases.

📄 License

The gem is available as open source under the terms of the MIT License License: MIT. See LICENSE.txt for the official Copyright Notice.

© Copyright

🤑 One more thing

You made it to the bottom of the page, so perhaps you’ll indulge me for another 20 seconds. I maintain many dozens of gems, including this one, because I want Ruby to be a great place for people to solve problems, big and small. Please consider supporting my efforts via the giant yellow link below, or one of the others at the head of this README.

Buy me a latte

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