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

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# Copyright 2010 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 'jwt'
require 'signet/oauth_2/client'
require 'delegate'
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module Google
class APIClient
##
# Generates access tokens using the JWT assertion profile. Requires a
# service account & access to the private key.
#
# @example Using Signet
#
# key = Google::APIClient::KeyUtils.load_from_pkcs12('client.p12', 'notasecret')
# client.authorization = Signet::OAuth2::Client.new(
# :token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
# :audience => 'https://accounts.google.com/o/oauth2/token',
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# :scope => 'https://www.googleapis.com/auth/prediction',
# :issuer => '123456-abcdef@developer.gserviceaccount.com',
# :signing_key => key)
# client.authorization.fetch_access_token!
# client.execute(...)
#
# @deprecated
# Service accounts are now supported directly in Signet
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# @see https://developers.google.com/accounts/docs/OAuth2ServiceAccount
class JWTAsserter
# @return [String] ID/email of the issuing party
attr_accessor :issuer
# @return [Fixnum] How long, in seconds, the assertion is valid for
attr_accessor :expiry
# @return [Fixnum] Seconds to expand the issued at/expiry window to account for clock skew
attr_accessor :skew
# @return [String] Scopes to authorize
attr_reader :scope
# @return [String,OpenSSL::PKey] key for signing assertions
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attr_writer :key
# @return [String] Algorithm used for signing
attr_accessor :algorithm
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##
# Initializes the asserter for a service account.
#
# @param [String] issuer
# Name/ID of the client issuing the assertion
# @param [String, Array] scope
# Scopes to authorize. May be a space delimited string or array of strings
# @param [String,OpenSSL::PKey] key
# Key for signing assertions
# @param [String] algorithm
# Algorithm to use, either 'RS256' for RSA with SHA-256
# or 'HS256' for HMAC with SHA-256
def initialize(issuer, scope, key, algorithm = "RS256")
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self.issuer = issuer
self.scope = scope
self.expiry = 60 # 1 min default
self.skew = 60
self.key = key
self.algorithm = algorithm
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end
##
# Set the scopes to authorize
#
# @param [String, Array] new_scope
# Scopes to authorize. May be a space delimited string or array of strings
def scope=(new_scope)
case new_scope
when Array
@scope = new_scope.join(' ')
when String
@scope = new_scope
when nil
@scope = ''
else
raise TypeError, "Expected Array or String, got #{new_scope.class}"
end
end
##
# Request a new access token.
#
# @param [String] person
# Email address of a user, if requesting a token to act on their behalf
# @param [Hash] options
# Pass through to Signet::OAuth2::Client.fetch_access_token
# @return [Signet::OAuth2::Client] Access token
#
# @see Signet::OAuth2::Client.fetch_access_token!
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def authorize(person = nil, options={})
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authorization = self.to_authorization(person)
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authorization.fetch_access_token!(options)
return authorization
end
##
# Builds a Signet OAuth2 client
#
# @return [Signet::OAuth2::Client] Access token
def to_authorization(person = nil)
return Signet::OAuth2::Client.new(
:token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
:audience => 'https://accounts.google.com/o/oauth2/token',
:scope => self.scope,
:issuer => @issuer,
:signing_key => @key,
:signing_algorithm => @algorithm,
:person => person
)
end
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end
end
end