640 lines
22 KiB
Ruby
640 lines
22 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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gem 'faraday', '~> 0.7.0'
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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 '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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module Google
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# TODO(bobaman): Document all this stuff.
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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] :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] :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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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_s] = 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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# 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 = 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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gem 'signet', '~> 0.3.0'
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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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gem 'signet', '~> 0.3.0'
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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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gem 'signet', '~> 0.3.0'
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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 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 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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# 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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template = Addressable::Template.new(
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"https://{host}/discovery/v1/apis"
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)
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return template.expand({"host" => self.host})
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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}"] ||= (begin
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template = Addressable::Template.new(
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"https://{host}/discovery/v1/apis/" +
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"{api}/{version}/rest"
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)
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template.expand({
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"host" => self.host,
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"api" => api,
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"version" => version
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})
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end)
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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.decode(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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request = self.generate_request(
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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 = self.transmit(:request => request)
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if response.status >= 200 && response.status < 300
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MultiJson.decode(response.body)
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elsif response.status >= 400
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case response.status
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when 400...500
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exception_type = ClientError
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when 500...600
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exception_type = ServerError
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else
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exception_type = TransmissionError
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end
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url = request.to_env(Faraday.default_connection)[:url]
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raise exception_type,
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"Could not retrieve directory document at: #{url}"
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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 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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request = self.generate_request(
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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 = self.transmit(:request => request)
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if response.status >= 200 && response.status < 300
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MultiJson.decode(response.body)
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elsif response.status >= 400
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case response.status
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when 400...500
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exception_type = ClientError
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when 500...600
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exception_type = ServerError
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else
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exception_type = TransmissionError
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end
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url = request.to_env(Faraday.default_connection)[:url]
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raise exception_type,
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"Could not retrieve discovery document at: #{url}"
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end
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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] rpc_name 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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# Generates a request.
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#
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# @option options [Google::APIClient::Method, String] :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 [Faraday::Request] 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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# Note: The merge method on a Hash object will coerce an API Reference
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# object into a Hash and merge with the default options.
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options={
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:version => 'v1',
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:authorization => self.authorization,
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:key => self.key,
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:user_ip => self.user_ip,
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:connection => Faraday.default_connection
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}.merge(options)
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# The Reference object is going to need this to do method ID lookups.
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options[:client] = self
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# The default value for the :authenticated option depends on whether an
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# authorization mechanism has been set.
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if options[:authorization]
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options = {:authenticated => true}.merge(options)
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else
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options = {:authenticated => false}.merge(options)
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end
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reference = Google::APIClient::Reference.new(options)
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request = reference.to_request
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if options[:authenticated]
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request = self.generate_authenticated_request(
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:request => request,
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:connection => options[:connection]
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)
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end
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return request
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end
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##
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# Signs a request using the current authorization mechanism.
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#
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# @param [Hash] options a customizable set of options
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#
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# @return [Faraday::Request] The signed or otherwise authenticated request.
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def generate_authenticated_request(options={})
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return authorization.generate_authenticated_request(options)
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end
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##
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# Transmits the request using the current HTTP adapter.
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#
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# @option options [Array, Faraday::Request] :request
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# The HTTP request to transmit.
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# @option options [String, Symbol] :method
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# The method for the HTTP request.
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# @option options [String, Addressable::URI] :uri
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# The URI for the HTTP request.
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# @option options [Array, Hash] :headers
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# The headers for the HTTP request.
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# @option options [String] :body
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# The body for the HTTP request.
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# @option options [Faraday::Connection] :connection
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# The HTTP connection to use.
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#
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# @return [Faraday::Response] The response from the server.
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def transmit(options={})
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options[:connection] ||= Faraday.default_connection
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if options[:request]
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if options[:request].kind_of?(Array)
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method, uri, headers, body = options[:request]
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elsif options[:request].kind_of?(Faraday::Request)
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unless options[:connection]
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raise ArgumentError,
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"Faraday::Request used, requires a connection to be provided."
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end
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method = options[:request].method.to_s.downcase.to_sym
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uri = options[:connection].build_url(
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options[:request].path, options[:request].params
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)
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headers = options[:request].headers || {}
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body = options[:request].body || ''
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end
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else
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method = options[:method] || :get
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uri = options[:uri]
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headers = options[:headers] || []
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body = options[:body] || ''
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end
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headers = headers.to_a if headers.kind_of?(Hash)
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request_components = {
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:method => method,
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:uri => uri,
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:headers => headers,
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:body => body
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}
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# Verify that we have all pieces required to transmit an HTTP request
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request_components.each do |(key, value)|
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unless value
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raise ArgumentError, "Missing :#{key} parameter."
|
|
end
|
|
end
|
|
|
|
if self.user_agent != nil
|
|
# If there's no User-Agent header, set one.
|
|
unless headers.kind_of?(Enumerable)
|
|
# We need to use some Enumerable methods, relying on the presence of
|
|
# the #each method.
|
|
class <<headers
|
|
include Enumerable
|
|
end
|
|
end
|
|
if self.user_agent.kind_of?(String)
|
|
unless headers.any? { |k, v| k.downcase == 'User-Agent'.downcase }
|
|
headers = headers.to_a.insert(0, ['User-Agent', self.user_agent])
|
|
end
|
|
elsif self.user_agent != nil
|
|
raise TypeError,
|
|
"Expected User-Agent to be String, got #{self.user_agent.class}"
|
|
end
|
|
end
|
|
|
|
request = Faraday::Request.create(method.to_s.downcase.to_sym) do |req|
|
|
req.url(Addressable::URI.parse(uri))
|
|
req.headers = Faraday::Utils::Headers.new(headers)
|
|
req.body = body
|
|
end
|
|
request_env = request.to_env(options[:connection])
|
|
response = options[:connection].app.call(request_env)
|
|
return response
|
|
end
|
|
|
|
##
|
|
# Executes a request, wrapping it in a Result object.
|
|
#
|
|
# @param [Google::APIClient::Method, String] api_method
|
|
# The method object or the RPC name of the method being executed.
|
|
# @param [Hash, Array] parameters
|
|
# The parameters to send to the method.
|
|
# @param [String] body The body of the request.
|
|
# @param [Hash, Array] headers The HTTP headers for the request.
|
|
# @option options [String] :version ("v1")
|
|
# The service version. Only used if `api_method` is a `String`.
|
|
# @option options [#generate_authenticated_request] :authorization
|
|
# The authorization mechanism for the response. Used only if
|
|
# `:authenticated` is `true`.
|
|
# @option options [TrueClass, FalseClass] :authenticated (true)
|
|
# `true` if the request must be signed or somehow
|
|
# authenticated, `false` otherwise.
|
|
#
|
|
# @return [Google::APIClient::Result] The result from the API.
|
|
#
|
|
# @example
|
|
# result = client.execute(
|
|
# :api_method => 'plus.activities.list',
|
|
# :parameters => {'collection' => 'public', 'userId' => 'me'}
|
|
# )
|
|
#
|
|
# @see Google::APIClient#generate_request
|
|
def execute(*params)
|
|
# 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
|
|
|
|
reference = Google::APIClient::Reference.new(options)
|
|
request = self.generate_request(reference)
|
|
response = self.transmit(
|
|
:request => request,
|
|
:connection => options[:connection]
|
|
)
|
|
return Google::APIClient::Result.new(reference, request, response)
|
|
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.data.respond_to?(:error) &&
|
|
result.data.error.respond_to?(:message)
|
|
# You're going to get a terrible error message if the response isn't
|
|
# parsed successfully as an error.
|
|
error_message = result.data.error.message
|
|
elsif result.data['error'] && result.data['error']['message']
|
|
error_message = result.data['error']['message']
|
|
end
|
|
if result.response.status >= 400
|
|
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
|
|
end
|
|
end
|
|
|
|
require 'google/api_client/version'
|