Class: HaveAPI::Authentication::OAuth2::Provider

Inherits:
Base
  • Object
show all
Defined in:
lib/haveapi/authentication/oauth2/provider.rb

Overview

OAuth2 authentication and authorization provider

Must be configured with Config using with_config.

Instance Attribute Summary collapse

Attributes inherited from Base

#name

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

auth_method, inherited, #resource_module

Constructor Details

#initialize(server, v, cfg) ⇒ Provider

Returns a new instance of Provider.



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 76

def initialize(server, v, cfg)
  @config = cfg.new(self, server, v)
  super(server, v)
end

Instance Attribute Details

#authorize_path ⇒ String (readonly)

Returns:

  • (String) 


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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 71

def authorize_path
  @authorize_path
end

#config ⇒ Config (readonly)

Returns:



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 74

def config
  @config
end

Class Method Details

.with_config(cfg) ⇒ Object

Configure the OAuth2 provider

Parameters:



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 62

def self.with_config(cfg)
  Module.new do
    define_singleton_method(:new) do |*args|
      Provider.new(*args, cfg)
    end
  end
end

Instance Method Details

#authenticate(request) ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 115

def authenticate(request)
  tokens = [
    request.params['access_token'],
    token_from_authorization_header(request),
    token_from_haveapi_header(request)
  ].compact

  token =
    case tokens.length
    when 0
      nil
    when 1
      tokens.first
    else
      raise 'Too many oauth2 tokens'
    end

  token && config.find_user_by_access_token(request, token)
end

#authorization_endpoint(handler) ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 176

def authorization_endpoint(handler)
  Rack::OAuth2::Server::Authorize.new do |req, res|
    client = config.find_client_by_id(req.client_id)
    req.bad_request! if client.nil?

    res.redirect_uri = req.verify_redirect_uri!(client.redirect_uri)

    if req.post?
      auth_res = config.handle_post_authorize(
        sinatra_handler: handler,
        sinatra_request: handler.request,
        sinatra_params: handler.params,
        oauth2_request: req,
        oauth2_response: res,
        client:
      )

      if auth_res.nil? || auth_res.cancel
        # Authentication failed / cancel requested
        req.access_denied!
      elsif auth_res.authenticated && auth_res.complete
        # Authentication was successful
        case req.response_type
        when :code
          res.code = config.get_authorization_code(auth_res)
        when :token
          req.unsupported_response_type!
        end

        res.approve!
      end
    else
      auth_res = config.handle_get_authorize(
        sinatra_handler: handler,
        sinatra_request: handler.request,
        sinatra_params: handler.params,
        oauth2_request: req,
        oauth2_response: res,
        client:
      )

      if auth_res.nil?
        # We expect `config.handle_get_authorize` has sent response body
      elsif auth_res.cancel
        # Cancel the process
        req.access_denied!
      elsif auth_res.authenticated && auth_res.complete
        # Authentication was successful
        case req.response_type
        when :code
          res.code = config.get_authorization_code(auth_res)
        when :token
          req.unsupported_response_type!
        end

        res.approve!
      end
    end
  end
end

#describe ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 147

def describe
  desc = <<-END
  OAuth2 authorization provider. While OAuth2 support in HaveAPI clients
  is limited, it is possible to use your API as an authentication source
  and to use OAuth2 tokens to access the API.

  HaveAPI partially implements RFC 6749: authorization response type "code"
  and token grant types "authorization_code" and "refresh_token". Other
  response and grant types are not supported at this time.

  The access token can be passed as bearer token according to RFC 6750,
  or using a custom HTTP header when the Authorization header is not
  practical.

  The access and refresh tokens can be revoked as per RFC 7009.
  END

  {
    description: desc,
    http_header: config.http_header,
    authorize_url: @authorize_url,
    authorize_path: @authorize_path,
    token_url: @token_url,
    token_path: @token_path,
    revoke_url: @revoke_url,
    revoke_path: @revoke_path
  }
end

#register_routes(sinatra, prefix) ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 85

def register_routes(sinatra, prefix)
  @authorize_path = File.join(prefix, 'authorize')
  @token_path = File.join(prefix, 'token')
  @revoke_path = File.join(prefix, 'revoke')

  base_url = config.base_url

  @authorize_url = File.join(base_url, @authorize_path)
  @token_url = File.join(base_url, @token_path)
  @revoke_url = File.join(base_url, @revoke_path)

  that = self

  sinatra.get @authorize_path do
    that.authorization_endpoint(self).call(request.env)
  end

  sinatra.post @authorize_path do
    that.authorization_endpoint(self).call(request.env)
  end

  sinatra.post @token_path do
    that.token_endpoint(self).call(request.env)
  end

  sinatra.post @revoke_path do
    that.revoke_endpoint(self).call(request.env)
  end
end

#revoke_endpoint(handler) ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 289

def revoke_endpoint(handler)
  RevokeEndpoint.new do |req, _res|
    ret = config.handle_post_revoke(
      handler.request,
      req.token,
      token_type_hint: req.token_type_hint
    )

    case ret
    when :revoked
      # ok
    when :unsupported
      req.unsupported_token_type!
    else
      raise Rack::OAuth2::Server::Abstract::ServerError
    end
  end
end

#setup ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 81

def setup
  @server.allow_header(config.http_header)
end

#token_endpoint(handler) ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 237

def token_endpoint(handler)
  Rack::OAuth2::Server::Token.new do |req, res|
    client = config.find_client_by_id(req.client_id)
    req.invalid_client! if client.nil? || !client.check_secret(req.client_secret)

    res.access_token =
      case req.grant_type
      when :authorization_code
        authorization = config.find_authorization_by_code(client, req.code)

        if authorization.nil? || !authorization.check_code_validity(req.redirect_uri)
          req.invalid_grant!
        end

        if authorization.code_challenge && authorization.code_challenge_method
          req.verify_code_verifier!(
            authorization.code_challenge,
            authorization.code_challenge_method.to_sym
          )
        end

        access_token, expires_at, refresh_token = config.get_tokens(authorization, handler.request)

        bearer_token = Rack::OAuth2::AccessToken::Bearer.new(
          access_token:,
          expires_in: expires_at - Time.now
        )
        bearer_token.refresh_token = refresh_token if refresh_token
        bearer_token

      when :refresh_token
        authorization = config.find_authorization_by_refresh_token(client, req.refresh_token)

        if authorization.nil?
          req.invalid_grant!
        end

        access_token, expires_at, refresh_token = config.refresh_tokens(authorization, handler.request)

        bearer_token = Rack::OAuth2::AccessToken::Bearer.new(
          access_token:,
          expires_in: expires_at - Time.now
        )
        bearer_token.refresh_token = refresh_token if refresh_token
        bearer_token

      else # :password, :client_credentials
        req.unsupported_grant_type!
      end
  end
end

#token_from_authorization_header(request) ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 135

def token_from_authorization_header(request)
  auth_header = Rack::Auth::AbstractRequest.new(request.env)

  return unless auth_header.provided? && !auth_header.parts.first.nil? && auth_header.scheme.to_s == 'bearer'

  auth_header.params
end

#token_from_haveapi_header(request) ⇒ Object 



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# File 'lib/haveapi/authentication/oauth2/provider.rb', line 143

def token_from_haveapi_header(request)
  request.env[header_to_env(config.http_header)]
end