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require 'base64'
module OAuth2
module Strategy
# The Client Credentials Strategy
#
# @see http://tools.ietf.org/html/draft-ietf-oauth-v2-15#section-4.4
class ClientCredentials < Base
# Not used for this strategy
#
# @raise [NotImplementedError]
def authorize_url
fail(NotImplementedError, 'The authorization endpoint is not used in this strategy')
end
# Retrieve an access token given the specified client.
#
# @param [Hash] params additional params
# @param [Hash] opts options
def get_token(params = {}, opts = {})
request_body = opts.delete('auth_scheme') == 'request_body'
params.merge!('grant_type' => 'client_credentials')
params.merge!(request_body ? client_params : {:headers => {'Authorization' => authorization(client_params['client_id'], client_params['client_secret'])}})
@client.get_token(params, opts.merge('refresh_token' => nil))
end
# Returns the Authorization header value for Basic Authentication
#
# @param [String] The client ID
# @param [String] the client secret
def authorization(client_id, client_secret)
'Basic ' + Base64.encode64(client_id + ':' + client_secret).gsub("\n", '')
end
end
end
end
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