google-api-ruby-client/lib/google/api_client/auth/storage.rb

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# Copyright 2013 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'signet/oauth_2/client'
module Google
class APIClient
##
# Represents cached OAuth 2 tokens stored on local disk in a
# JSON serialized file. Meant to resemble the serialized format
# http://google-api-python-client.googlecode.com/hg/docs/epy/oauth2client.file.Storage-class.html
#
class Storage
AUTHORIZATION_URI = 'https://accounts.google.com/o/oauth2/auth'
TOKEN_CREDENTIAL_URI = 'https://accounts.google.com/o/oauth2/token'
# @return [Object] Storage object.
attr_accessor :store
# @return [Signet::OAuth2::Client]
attr_reader :authorization
##
# Initializes the Storage object.
#
# @params [Object] Storage object
def initialize(store)
@store= store
@authorization = nil
end
##
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# Write the credentials to the specified store.
#
# @params [Signet::OAuth2::Client] authorization
# Optional authorization instance. If not provided, the authorization
# already associated with this instance will be written.
def write_credentials(authorization=nil)
@authorization = authorization if authorization
if @authorization.respond_to?(:refresh_token) && @authorization.refresh_token
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store.write_credentials(credentials_hash)
end
end
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##
# Loads credentials and authorizes an client.
# @return [Object] Signet::OAuth2::Client or NIL
def authorize
@authorization = nil
cached_credentials = load_credentials
if cached_credentials && cached_credentials.size > 0
@authorization = Signet::OAuth2::Client.new(cached_credentials)
@authorization.issued_at = Time.at(cached_credentials['issued_at'].to_i)
self.refresh_authorization if @authorization.expired?
end
return @authorization
end
##
# refresh credentials and save them to store
def refresh_authorization
authorization.refresh!
self.write_credentials
end
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private
##
# Attempt to read in credentials from the specified store.
def load_credentials
store.load_credentials
end
##
# @return [Hash] with credentials
def credentials_hash
{
:access_token => authorization.access_token,
:authorization_uri => AUTHORIZATION_URI,
:client_id => authorization.client_id,
:client_secret => authorization.client_secret,
:expires_in => authorization.expires_in,
:refresh_token => authorization.refresh_token,
:token_credential_uri => TOKEN_CREDENTIAL_URI,
:issued_at => authorization.issued_at.to_i
}
end
end
end
end