604 lines
21 KiB
Ruby
604 lines
21 KiB
Ruby
# Copyright 2010 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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require 'faraday'
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require 'faraday/utils'
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require 'multi_json'
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require 'compat/multi_json'
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require 'stringio'
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require 'google/api_client/version'
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require 'google/api_client/errors'
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require 'google/api_client/environment'
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require 'google/api_client/discovery'
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require 'google/api_client/reference'
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require 'google/api_client/result'
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require 'google/api_client/media'
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require 'google/api_client/service_account'
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require 'google/api_client/batch'
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module Google
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##
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# This class manages APIs communication.
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class APIClient
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##
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# Creates a new Google API client.
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#
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# @param [Hash] options The configuration parameters for the client.
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# @option options [Symbol, #generate_authenticated_request] :authorization
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# (:oauth_1)
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# The authorization mechanism used by the client. The following
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# mechanisms are supported out-of-the-box:
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# <ul>
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# <li><code>:two_legged_oauth_1</code></li>
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# <li><code>:oauth_1</code></li>
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# <li><code>:oauth_2</code></li>
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# </ul>
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# @option options [String] :application_name
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# The name of the application using the client.
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# @option options [String] :application_version
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# The version number of the application using the client.
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# @option options [String] :user_agent
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# ("{app_name} google-api-ruby-client/{version} {os_name}/{os_version}")
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# The user agent used by the client. Most developers will want to
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# leave this value alone and use the `:application_name` option instead.
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# @option options [String] :host ("www.googleapis.com")
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# The API hostname used by the client. This rarely needs to be changed.
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# @option options [String] :port (443)
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# The port number used by the client. This rarely needs to be changed.
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# @option options [String] :discovery_path ("/discovery/v1")
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# The discovery base path. This rarely needs to be changed.
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def initialize(options={})
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# Normalize key to String to allow indifferent access.
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options = options.inject({}) do |accu, (key, value)|
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accu[key.to_sym] = value
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accu
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end
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# Almost all API usage will have a host of 'www.googleapis.com'.
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self.host = options[:host] || 'www.googleapis.com'
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self.port = options[:port] || 443
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self.discovery_path = options[:discovery_path] || '/discovery/v1'
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# Most developers will want to leave this value alone and use the
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# application_name option.
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application_string = (
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options[:application_name] ? (
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"#{options[:application_name]}/" +
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"#{options[:application_version] || '0.0.0'}"
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) : ""
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)
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self.user_agent = options[:user_agent] || (
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"#{application_string} " +
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"google-api-ruby-client/#{VERSION::STRING} " +
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ENV::OS_VERSION
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).strip
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# The writer method understands a few Symbols and will generate useful
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# default authentication mechanisms.
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self.authorization =
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options.key?(:authorization) ? options[:authorization] : :oauth_2
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self.key = options[:key]
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self.user_ip = options[:user_ip]
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@discovery_uris = {}
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@discovery_documents = {}
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@discovered_apis = {}
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return self
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end
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##
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# Returns the authorization mechanism used by the client.
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#
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# @return [#generate_authenticated_request] The authorization mechanism.
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attr_reader :authorization
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##
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# Sets the authorization mechanism used by the client.
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#
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# @param [#generate_authenticated_request] new_authorization
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# The new authorization mechanism.
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def authorization=(new_authorization)
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case new_authorization
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when :oauth_1, :oauth
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require 'signet/oauth_1/client'
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# NOTE: Do not rely on this default value, as it may change
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new_authorization = Signet::OAuth1::Client.new(
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:temporary_credential_uri =>
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'https://www.google.com/accounts/OAuthGetRequestToken',
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:authorization_uri =>
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'https://www.google.com/accounts/OAuthAuthorizeToken',
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:token_credential_uri =>
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'https://www.google.com/accounts/OAuthGetAccessToken',
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:client_credential_key => 'anonymous',
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:client_credential_secret => 'anonymous'
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)
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when :two_legged_oauth_1, :two_legged_oauth
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require 'signet/oauth_1/client'
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# NOTE: Do not rely on this default value, as it may change
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new_authorization = Signet::OAuth1::Client.new(
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:client_credential_key => nil,
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:client_credential_secret => nil,
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:two_legged => true
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)
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when :oauth_2
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require 'signet/oauth_2/client'
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# NOTE: Do not rely on this default value, as it may change
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new_authorization = Signet::OAuth2::Client.new(
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:authorization_uri =>
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'https://accounts.google.com/o/oauth2/auth',
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:token_credential_uri =>
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'https://accounts.google.com/o/oauth2/token'
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)
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when nil
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# No authorization mechanism
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else
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if !new_authorization.respond_to?(:generate_authenticated_request)
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raise TypeError,
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'Expected authorization mechanism to respond to ' +
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'#generate_authenticated_request.'
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end
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end
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@authorization = new_authorization
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return @authorization
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end
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##
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# The application's API key issued by the API console.
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#
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# @return [String] The API key.
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attr_accessor :key
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##
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# The IP address of the user this request is being performed on behalf of.
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#
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# @return [String] The user's IP address.
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attr_accessor :user_ip
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##
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# The user agent used by the client.
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#
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# @return [String]
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# The user agent string used in the User-Agent header.
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attr_accessor :user_agent
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##
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# The API hostname used by the client.
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#
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# @return [String]
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# The API hostname. Should almost always be 'www.googleapis.com'.
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attr_accessor :host
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##
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# The port number used by the client.
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#
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# @return [String]
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# The port number. Should almost always be 443.
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attr_accessor :port
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##
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# The base path used by the client for discovery.
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#
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# @return [String]
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# The base path. Should almost always be '/discovery/v1'.
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attr_accessor :discovery_path
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##
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# Returns the URI for the directory document.
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#
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# @return [Addressable::URI] The URI of the directory document.
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def directory_uri
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return resolve_uri(self.discovery_path + '/apis')
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end
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##
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# Manually registers a URI as a discovery document for a specific version
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# of an API.
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#
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# @param [String, Symbol] api The API name.
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# @param [String] version The desired version of the API.
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# @param [Addressable::URI] uri The URI of the discovery document.
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def register_discovery_uri(api, version, uri)
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api = api.to_s
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version = version || 'v1'
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@discovery_uris["#{api}:#{version}"] = uri
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end
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##
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# Returns the URI for the discovery document.
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#
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# @param [String, Symbol] api The API name.
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# @param [String] version The desired version of the API.
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# @return [Addressable::URI] The URI of the discovery document.
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def discovery_uri(api, version=nil)
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api = api.to_s
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version = version || 'v1'
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return @discovery_uris["#{api}:#{version}"] ||= (
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resolve_uri(
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self.discovery_path + '/apis/{api}/{version}/rest',
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'api' => api,
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'version' => version
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)
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)
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end
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##
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# Manually registers a pre-loaded discovery document for a specific version
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# of an API.
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#
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# @param [String, Symbol] api The API name.
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# @param [String] version The desired version of the API.
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# @param [String, StringIO] discovery_document
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# The contents of the discovery document.
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def register_discovery_document(api, version, discovery_document)
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api = api.to_s
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version = version || 'v1'
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if discovery_document.kind_of?(StringIO)
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discovery_document.rewind
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discovery_document = discovery_document.string
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elsif discovery_document.respond_to?(:to_str)
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discovery_document = discovery_document.to_str
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else
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raise TypeError,
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"Expected String or StringIO, got #{discovery_document.class}."
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end
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@discovery_documents["#{api}:#{version}"] =
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MultiJson.load(discovery_document)
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end
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##
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# Returns the parsed directory document.
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#
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# @return [Hash] The parsed JSON from the directory document.
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def directory_document
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return @directory_document ||= (begin
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response = self.execute!(
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:http_method => :get,
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:uri => self.directory_uri,
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:authenticated => false
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)
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response.data
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end)
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end
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##
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# Returns the parsed discovery document.
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#
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# @param [String, Symbol] api The API name.
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# @param [String] version The desired version of the API.
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# @return [Hash] The parsed JSON from the discovery document.
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def discovery_document(api, version=nil)
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api = api.to_s
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version = version || 'v1'
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return @discovery_documents["#{api}:#{version}"] ||= (begin
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response = self.execute!(
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:http_method => :get,
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:uri => self.discovery_uri(api, version),
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:authenticated => false
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)
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response.data
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end)
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end
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##
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# Returns all APIs published in the directory document.
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#
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# @return [Array] The list of available APIs.
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def discovered_apis
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@directory_apis ||= (begin
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document_base = self.directory_uri
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if self.directory_document && self.directory_document['items']
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self.directory_document['items'].map do |discovery_document|
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Google::APIClient::API.new(
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document_base,
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discovery_document
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)
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end
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else
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[]
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end
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end)
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end
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##
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# Returns the service object for a given service name and service version.
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#
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# @param [String, Symbol] api The API name.
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# @param [String] version The desired version of the API.
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#
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# @return [Google::APIClient::API] The service object.
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def discovered_api(api, version=nil)
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if !api.kind_of?(String) && !api.kind_of?(Symbol)
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raise TypeError,
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"Expected String or Symbol, got #{api.class}."
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end
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api = api.to_s
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version = version || 'v1'
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return @discovered_apis["#{api}:#{version}"] ||= begin
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document_base = self.discovery_uri(api, version)
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discovery_document = self.discovery_document(api, version)
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if document_base && discovery_document
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Google::APIClient::API.new(
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document_base,
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discovery_document
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)
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else
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nil
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end
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end
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end
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##
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# Returns the method object for a given RPC name and service version.
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#
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# @param [String, Symbol] rpc_name The RPC name of the desired method.
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# @param [String, Symbol] api The API the method is within.
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# @param [String] version The desired version of the API.
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#
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# @return [Google::APIClient::Method] The method object.
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def discovered_method(rpc_name, api, version=nil)
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if !rpc_name.kind_of?(String) && !rpc_name.kind_of?(Symbol)
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raise TypeError,
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"Expected String or Symbol, got #{rpc_name.class}."
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end
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rpc_name = rpc_name.to_s
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api = api.to_s
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version = version || 'v1'
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service = self.discovered_api(api, version)
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if service.to_h[rpc_name]
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return service.to_h[rpc_name]
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else
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return nil
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end
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end
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##
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# Returns the service object with the highest version number.
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#
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# @note <em>Warning</em>: This method should be used with great care.
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# As APIs are updated, minor differences between versions may cause
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# incompatibilities. Requesting a specific version will avoid this issue.
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#
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# @param [String, Symbol] api The name of the service.
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#
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# @return [Google::APIClient::API] The service object.
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def preferred_version(api)
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if !api.kind_of?(String) && !api.kind_of?(Symbol)
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raise TypeError,
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"Expected String or Symbol, got #{api.class}."
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end
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api = api.to_s
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return self.discovered_apis.detect do |a|
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a.name == api && a.preferred == true
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end
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end
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##
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# Verifies an ID token against a server certificate. Used to ensure that
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# an ID token supplied by an untrusted client-side mechanism is valid.
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# Raises an error if the token is invalid or missing.
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def verify_id_token!
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require 'jwt'
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require 'openssl'
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@certificates ||= {}
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if !self.authorization.respond_to?(:id_token)
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raise ArgumentError, (
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"Current authorization mechanism does not support ID tokens: " +
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"#{self.authorization.class.to_s}"
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)
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elsif !self.authorization.id_token
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raise ArgumentError, (
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"Could not verify ID token, ID token missing. " +
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"Scopes were: #{self.authorization.scope.inspect}"
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)
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else
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check_cached_certs = lambda do
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valid = false
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for key, cert in @certificates
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begin
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self.authorization.decoded_id_token(cert.public_key)
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valid = true
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rescue JWT::DecodeError, Signet::UnsafeOperationError
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# Expected exception. Ignore, ID token has not been validated.
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end
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end
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valid
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end
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if check_cached_certs.call()
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return true
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end
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response = self.execute!(
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:http_method => :get,
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:uri => 'https://www.googleapis.com/oauth2/v1/certs',
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:authenticated => false
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)
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@certificates.merge!(
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Hash[MultiJson.load(response.body).map do |key, cert|
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[key, OpenSSL::X509::Certificate.new(cert)]
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end]
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)
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if check_cached_certs.call()
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return true
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else
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raise InvalidIDTokenError,
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"Could not verify ID token against any available certificate."
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end
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end
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return nil
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end
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##
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# Generates a request.
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#
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# @option options [Google::APIClient::Method] :api_method
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# The method object or the RPC name of the method being executed.
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# @option options [Hash, Array] :parameters
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# The parameters to send to the method.
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# @option options [Hash, Array] :headers The HTTP headers for the request.
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# @option options [String] :body The body of the request.
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# @option options [String] :version ("v1")
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# The service version. Only used if `api_method` is a `String`.
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# @option options [#generate_authenticated_request] :authorization
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# The authorization mechanism for the response. Used only if
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# `:authenticated` is `true`.
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# @option options [TrueClass, FalseClass] :authenticated (true)
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# `true` if the request must be signed or somehow
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# authenticated, `false` otherwise.
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#
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# @return [Google::APIClient::Reference] The generated request.
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#
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# @example
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# request = client.generate_request(
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# :api_method => 'plus.activities.list',
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# :parameters =>
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# {'collection' => 'public', 'userId' => 'me'}
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# )
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def generate_request(options={})
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options = {
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:api_client => self
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}.merge(options)
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return Google::APIClient::Request.new(options)
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end
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##
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# Executes a request, wrapping it in a Result object.
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#
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# @param [Google::APIClient::Request, Hash, Array] params
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# Either a Google::APIClient::Request, a Hash, or an Array.
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#
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# If a Google::APIClient::Request, no other parameters are expected.
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#
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# If a Hash, the below parameters are handled. If an Array, the
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# parameters are assumed to be in the below order:
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#
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# - (Google::APIClient::Method) api_method:
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# The method object or the RPC name of the method being executed.
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# - (Hash, Array) parameters:
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# The parameters to send to the method.
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# - (String) body: The body of the request.
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# - (Hash, Array) headers: The HTTP headers for the request.
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# - (Hash) options: A set of options for the request, of which:
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# - (String) :version (default: "v1") -
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# The service version. Only used if `api_method` is a `String`.
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# - (#generate_authenticated_request) :authorization (default: true) -
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# The authorization mechanism for the response. Used only if
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# `:authenticated` is `true`.
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# - (TrueClass, FalseClass) :authenticated (default: true) -
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# `true` if the request must be signed or somehow
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# authenticated, `false` otherwise.
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#
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# @return [Google::APIClient::Result] The result from the API, nil if batch.
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#
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# @example
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# result = client.execute(batch_request)
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#
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# @example
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# plus = client.discovered_api('plus')
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# result = client.execute(
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# :api_method => plus.activities.list,
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# :parameters => {'collection' => 'public', 'userId' => 'me'}
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# )
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#
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# @see Google::APIClient#generate_request
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def execute(*params)
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if params.last.kind_of?(Google::APIClient::Request) &&
|
|
params.size == 1
|
|
request = params.pop
|
|
options = {}
|
|
else
|
|
# This block of code allows us to accept multiple parameter passing
|
|
# styles, and maintaining some backwards compatibility.
|
|
#
|
|
# Note: I'm extremely tempted to deprecate this style of execute call.
|
|
if params.last.respond_to?(:to_hash) && params.size == 1
|
|
options = params.pop
|
|
else
|
|
options = {}
|
|
end
|
|
|
|
options[:api_method] = params.shift if params.size > 0
|
|
options[:parameters] = params.shift if params.size > 0
|
|
options[:body] = params.shift if params.size > 0
|
|
options[:headers] = params.shift if params.size > 0
|
|
options[:client] = self
|
|
request = self.generate_request(options)
|
|
end
|
|
|
|
request.headers['User-Agent'] ||= '' + self.user_agent unless self.user_agent.nil?
|
|
request.parameters['key'] ||= self.key unless self.key.nil?
|
|
request.parameters['userIp'] ||= self.user_ip unless self.user_ip.nil?
|
|
|
|
connection = options[:connection] || Faraday.default_connection
|
|
request.authorization = options[:authorization] || self.authorization unless options[:authenticated] == false
|
|
|
|
result = request.send(connection)
|
|
return result
|
|
end
|
|
|
|
##
|
|
# Same as Google::APIClient#execute, but raises an exception if there was
|
|
# an error.
|
|
#
|
|
# @see Google::APIClient#execute
|
|
def execute!(*params)
|
|
result = self.execute(*params)
|
|
if result.error?
|
|
error_message = result.error_message
|
|
case result.response.status
|
|
when 400...500
|
|
exception_type = ClientError
|
|
error_message ||= "A client error has occurred."
|
|
when 500...600
|
|
exception_type = ServerError
|
|
error_message ||= "A server error has occurred."
|
|
else
|
|
exception_type = TransmissionError
|
|
error_message ||= "A transmission error has occurred."
|
|
end
|
|
raise exception_type, error_message
|
|
end
|
|
return result
|
|
end
|
|
|
|
protected
|
|
|
|
##
|
|
# Resolves a URI template against the client's configured base.
|
|
#
|
|
# @api private
|
|
# @param [String, Addressable::URI, Addressable::Template] template
|
|
# The template to resolve.
|
|
# @param [Hash] mapping The mapping that corresponds to the template.
|
|
# @return [Addressable::URI] The expanded URI.
|
|
def resolve_uri(template, mapping={})
|
|
@base_uri ||= Addressable::URI.new(
|
|
:scheme => 'https',
|
|
:host => self.host,
|
|
:port => self.port
|
|
).normalize
|
|
template = if template.kind_of?(Addressable::Template)
|
|
template.pattern
|
|
elsif template.respond_to?(:to_str)
|
|
template.to_str
|
|
else
|
|
raise TypeError,
|
|
"Expected String, Addressable::URI, or Addressable::Template, " +
|
|
"got #{template.class}."
|
|
end
|
|
return Addressable::Template.new(@base_uri + template).expand(mapping)
|
|
end
|
|
|
|
end
|
|
end
|
|
|
|
require 'google/api_client/version'
|