Implement RFC 8414 for OAuth 2.0 server metadata (#29191)

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Emelia Smith 2024-05-06 15:17:56 +02:00 committed by GitHub
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@ -0,0 +1,23 @@
# frozen_string_literal: true
module WellKnown
class OauthMetadataController < ActionController::Base # rubocop:disable Rails/ApplicationController
include CacheConcern
# Prevent `active_model_serializer`'s `ActionController::Serialization` from calling `current_user`
# and thus re-issuing session cookies
serialization_scope nil
def show
# Due to this document potentially changing between Mastodon versions (as
# new OAuth scopes are added), we don't use expires_in to cache upstream,
# instead just caching in the rails cache:
render_with_cache(
json: ::OauthMetadataPresenter.new,
serializer: ::OauthMetadataSerializer,
content_type: 'application/json',
expires_in: 15.minutes
)
end
end
end

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# frozen_string_literal: true
class OauthMetadataPresenter < ActiveModelSerializers::Model
include RoutingHelper
attributes :issuer, :authorization_endpoint, :token_endpoint,
:revocation_endpoint, :scopes_supported,
:response_types_supported, :response_modes_supported,
:grant_types_supported, :token_endpoint_auth_methods_supported,
:service_documentation, :app_registration_endpoint
def issuer
root_url
end
def service_documentation
'https://docs.joinmastodon.org/'
end
def authorization_endpoint
oauth_authorization_url
end
def token_endpoint
oauth_token_url
end
# As the api_v1_apps route doesn't technically conform to the specification
# for OAuth 2.0 Dynamic Client Registration defined in RFC 7591 we use a
# non-standard property for now to indicate the mastodon specific registration
# endpoint. See: https://datatracker.ietf.org/doc/html/rfc7591
def app_registration_endpoint
api_v1_apps_url
end
def revocation_endpoint
oauth_revoke_url
end
def scopes_supported
doorkeeper.scopes
end
def response_types_supported
doorkeeper.authorization_response_types
end
def response_modes_supported
doorkeeper.authorization_response_flows.flat_map(&:response_mode_matches).uniq
end
def grant_types_supported
grant_types_supported = doorkeeper.grant_flows.dup
grant_types_supported << 'refresh_token' if doorkeeper.refresh_token_enabled?
grant_types_supported
end
def token_endpoint_auth_methods_supported
%w(client_secret_basic client_secret_post)
end
private
def doorkeeper
@doorkeeper ||= Doorkeeper.configuration
end
end

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# frozen_string_literal: true
class OauthMetadataSerializer < ActiveModel::Serializer
attributes :issuer, :authorization_endpoint, :token_endpoint,
:revocation_endpoint, :scopes_supported,
:response_types_supported, :response_modes_supported,
:grant_types_supported, :token_endpoint_auth_methods_supported,
:service_documentation, :app_registration_endpoint
end

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@ -62,6 +62,7 @@ Rails.application.routes.draw do
tokens: 'oauth/tokens'
end
get '.well-known/oauth-authorization-server', to: 'well_known/oauth_metadata#show', as: :oauth_metadata, defaults: { format: 'json' }
get '.well-known/host-meta', to: 'well_known/host_meta#show', as: :host_meta, defaults: { format: 'xml' }
get '.well-known/nodeinfo', to: 'well_known/node_info#index', as: :nodeinfo, defaults: { format: 'json' }
get '.well-known/webfinger', to: 'well_known/webfinger#show', as: :webfinger

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# frozen_string_literal: true
require 'rails_helper'
describe 'The /.well-known/oauth-authorization-server request' do
let(:protocol) { ENV.fetch('LOCAL_HTTPS', true) ? :https : :http }
before do
host! ENV.fetch('LOCAL_DOMAIN')
end
it 'returns http success with valid JSON response' do
get '/.well-known/oauth-authorization-server'
expect(response)
.to have_http_status(200)
.and have_attributes(
media_type: 'application/json'
)
grant_types_supported = Doorkeeper.configuration.grant_flows.dup
grant_types_supported << 'refresh_token' if Doorkeeper.configuration.refresh_token_enabled?
expect(body_as_json).to include(
issuer: root_url(protocol: protocol),
service_documentation: 'https://docs.joinmastodon.org/',
authorization_endpoint: oauth_authorization_url(protocol: protocol),
token_endpoint: oauth_token_url(protocol: protocol),
revocation_endpoint: oauth_revoke_url(protocol: protocol),
scopes_supported: Doorkeeper.configuration.scopes.map(&:to_s),
response_types_supported: Doorkeeper.configuration.authorization_response_types,
grant_types_supported: grant_types_supported,
# non-standard extension:
app_registration_endpoint: api_v1_apps_url(protocol: protocol)
)
end
end