588 lines
21 KiB
Ruby
588 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 'httpadapter'
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require 'json'
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require 'stringio'
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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 and version of the application using the client. This should
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# be given in the form `"{name}/{version}"`.
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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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self.user_agent = options["user_agent"] || (
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(options["application_name"] || '')
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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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# The HTTP adapter controls all of the HTTP traffic the client generates.
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# By default, Net::HTTP is used, but adding support for other clients
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# is trivial.
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if options["http_adapter"]
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self.http_adapter = options["http_adapter"]
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else
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require 'httpadapter/adapters/net_http'
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# NOTE: Do not rely on this default value, as it may change
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self.http_adapter = HTTPAdapter::NetHTTPAdapter.new
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end
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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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# Returns the HTTP adapter used by the client.
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#
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# @return [HTTPAdapter]
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# The HTTP adapter object. The object must include the
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# HTTPAdapter module and conform to its interface.
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attr_reader :http_adapter
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##
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# Returns the HTTP adapter used by the client.
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#
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# @return [HTTPAdapter]
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# The HTTP adapter object. The object must include the
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# HTTPAdapter module and conform to its interface.
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def http_adapter=(new_http_adapter)
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if new_http_adapter.kind_of?(HTTPAdapter)
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@http_adapter = new_http_adapter
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else
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raise TypeError, "Expected HTTPAdapter, got #{new_http_adapter.class}."
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end
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end
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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 service name.
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# @param [String] version The desired version of the service.
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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 service name.
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# @param [String] version The desired version of the service.
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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 service name.
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# @param [String] version The desired version of the service.
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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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::JSON.parse(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_uri = self.directory_uri
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request = ['GET', request_uri, [], []]
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response = self.transmit(request)
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status, headers, body = response
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if status == 200 # TODO(bobaman) Better status code handling?
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merged_body = body.inject(StringIO.new) do |accu, chunk|
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accu.write(chunk)
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accu
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end
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::JSON.parse(merged_body.string)
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elsif status >= 400 && status < 500
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raise ClientError,
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"Could not retrieve discovery document at: #{request_uri}"
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elsif status >= 500 && status < 600
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raise ServerError,
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"Could not retrieve discovery document at: #{request_uri}"
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elsif status > 600
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raise TransmissionError,
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"Could not retrieve discovery document at: #{request_uri}"
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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 service name.
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# @param [String] version The desired version of the service.
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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_uri = self.discovery_uri(api, version)
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request = ['GET', request_uri, [], []]
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response = self.transmit(request)
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status, headers, body = response
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if status == 200 # TODO(bobaman) Better status code handling?
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merged_body = body.inject(StringIO.new) do |accu, chunk|
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accu.write(chunk)
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accu
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end
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::JSON.parse(merged_body.string)
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elsif status >= 400 && status < 500
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raise ClientError,
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"Could not retrieve discovery document at: #{request_uri}"
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elsif status >= 500 && status < 600
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raise ServerError,
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"Could not retrieve discovery document at: #{request_uri}"
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elsif status > 600
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raise TransmissionError,
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"Could not retrieve discovery document at: #{request_uri}"
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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 service name.
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# @param [String] version The desired version of the service.
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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] version The desired version of the service.
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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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# TODO(bobaman): Update to use directory API.
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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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# @param [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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# @param [Hash, Array] parameters
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# The parameters to send to the method.
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# @param [String] body The body of the request.
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# @param [Hash, Array] headers The HTTP headers for the request.
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# @param [Hash] options
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# The configuration parameters for the request.
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# - <code>:version</code> —
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# The service version. Only used if <code>api_method</code> is a
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# <code>String</code>. Defaults to <code>'v1'</code>.
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# - <code>:authorization</code> —
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# The authorization mechanism for the response. Used only if
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# <code>:authenticated</code> is <code>true</code>.
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# - <code>:authenticated</code> —
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# <code>true</code> if the request must be signed or otherwise
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# authenticated, <code>false</code>
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# otherwise. Defaults to <code>true</code> if an authorization
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# mechanism has been set, <code>false</code> otherwise.
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#
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# @return [Array] 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 => 'chili.activities.list',
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# :parameters =>
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# {'scope' => '@self', 'userId' => '@me', 'alt' => 'json'}
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# )
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# method, uri, headers, body = request
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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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}.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(:request => request)
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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 The options to pass through.
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#
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# @return [Array] 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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# @param [Array] request The request to transmit.
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# @param [#transmit] adapter The HTTP adapter.
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#
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# @return [Array] The response from the server.
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def transmit(request, adapter=self.http_adapter)
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if self.user_agent != nil
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# If there's no User-Agent header, set one.
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method, uri, headers, body = request
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unless headers.kind_of?(Enumerable)
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# We need to use some Enumerable methods, relying on the presence of
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# the #each method.
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class <<headers
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include Enumerable
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end
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end
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if self.user_agent.kind_of?(String)
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unless headers.any? { |k, v| k.downcase == 'User-Agent'.downcase }
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headers = headers.to_a.insert(0, ['User-Agent', self.user_agent])
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end
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elsif self.user_agent != nil
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raise TypeError,
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"Expected User-Agent to be String, got #{self.user_agent.class}"
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end
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end
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adapter.transmit([method, uri, headers, body])
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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::Method, String] api_method
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# The method object or the RPC name of the method being executed.
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# @param [Hash, Array] parameters
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# The parameters to send to the method.
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# @param [String] body The body of the request.
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# @param [Hash, Array] headers The HTTP headers for the request.
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# @param [Hash] options
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|
# The configuration parameters for the request.
|
|
# - <code>:version</code> —
|
|
# The service version. Only used if <code>api_method</code> is a
|
|
# <code>String</code>. Defaults to <code>'v1'</code>.
|
|
# - <code>:adapter</code> —
|
|
# The HTTP adapter.
|
|
# - <code>:authorization</code> —
|
|
# The authorization mechanism for the response. Used only if
|
|
# <code>:authenticated</code> is <code>true</code>.
|
|
# - <code>:authenticated</code> —
|
|
# <code>true</code> if the request must be signed or otherwise
|
|
# authenticated, <code>false</code>
|
|
# otherwise. Defaults to <code>true</code>.
|
|
#
|
|
# @return [Array] The response from the API.
|
|
#
|
|
# @example
|
|
# request = client.generate_request(
|
|
# :api_method => 'chili.activities.list',
|
|
# :parameters =>
|
|
# {'scope' => '@self', 'userId' => '@me', 'alt' => 'json'}
|
|
# )
|
|
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[:merged_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,
|
|
options[:adapter] || self.http_adapter
|
|
)
|
|
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)
|
|
status, _, _ = result.response
|
|
if result.data.respond_to?(:error)
|
|
# You're going to get a terrible error message if the response isn't
|
|
# parsed successfully as an error.
|
|
error_message = result.data.error
|
|
end
|
|
if status >= 400 && status < 500
|
|
raise ClientError,
|
|
error_message || "A client error has occurred."
|
|
elsif status >= 500 && status < 600
|
|
raise ServerError,
|
|
error_message || "A server error has occurred."
|
|
elsif status > 600
|
|
raise TransmissionError,
|
|
error_message || "A transmission error has occurred."
|
|
end
|
|
return result
|
|
end
|
|
end
|
|
end
|
|
|
|
require 'google/api_client/version'
|