2010-09-16 19:12:52 +00:00
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# 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 'json'
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require 'addressable/uri'
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require 'addressable/template'
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require 'extlib/inflection'
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2010-10-05 23:49:00 +00:00
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module Google
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class APIClient
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2010-10-07 00:02:22 +00:00
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##
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# An exception that is raised if a method is called with missing or
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# invalid parameter values.
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2010-09-16 19:12:52 +00:00
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class ValidationError < StandardError
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end
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2010-10-07 00:02:22 +00:00
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##
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# A service that has been described by a discovery document.
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2010-09-16 19:12:52 +00:00
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class Service
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2010-10-07 00:02:22 +00:00
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##
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# Creates a description of a particular version of a service.
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#
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# @param [String] service_name
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# The identifier for the service. Note that while this frequently
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# matches the first segment of all of the service's RPC names, this
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# should not be assumed. There is no requirement that these match.
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# @param [String] service_version
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# The identifier for the service version.
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# @param [Hash] service_description
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# The section of the discovery document that applies to this service
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# version.
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#
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# @return [Google::APIClient::Service] The constructed service object.
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2010-09-16 19:12:52 +00:00
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def initialize(service_name, service_version, service_description)
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@name = service_name
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@version = service_version
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@description = service_description
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metaclass = (class <<self; self; end)
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self.resources.each do |resource|
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method_name = Extlib::Inflection.underscore(resource.name).to_sym
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if !self.respond_to?(method_name)
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metaclass.send(:define_method, method_name) { resource }
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end
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end
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self.methods.each do |method|
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method_name = Extlib::Inflection.underscore(method.name).to_sym
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if !self.respond_to?(method_name)
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metaclass.send(:define_method, method_name) { method }
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end
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end
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end
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2010-10-07 00:02:22 +00:00
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##
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# Returns the identifier for the service.
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#
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# @return [String] The service identifier.
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attr_reader :name
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##
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# Returns the version of the service.
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#
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# @return [String] The service version.
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attr_reader :version
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2010-09-16 19:12:52 +00:00
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2010-10-07 00:02:22 +00:00
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##
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# Returns the parsed section of the discovery document that applies to
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# this version of the service.
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#
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# @return [Hash] The service description.
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attr_reader :description
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##
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# Returns the base URI for this version of the service.
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#
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# @return [Addressable::URI] The base URI that methods are joined to.
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2010-09-16 19:12:52 +00:00
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def base
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return @base ||= Addressable::URI.parse(self.description['baseUrl'])
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end
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2010-10-07 00:02:22 +00:00
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##
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# A list of resources available at the root level of this version of the
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# service.
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#
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# @return [Array] A list of {Google::APIClient::Resource} objects.
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2010-09-16 19:12:52 +00:00
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def resources
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return @resources ||= (
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(self.description['resources'] || []).inject([]) do |accu, (k, v)|
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accu << ::Google::APIClient::Resource.new(self.base, k, v)
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accu
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end
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)
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end
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2010-10-07 00:02:22 +00:00
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##
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# A list of methods available at the root level of this version of the
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# service.
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#
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# @return [Array] A list of {Google::APIClient::Method} objects.
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def methods
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return @methods ||= (
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(self.description['methods'] || []).inject([]) do |accu, (k, v)|
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accu << ::Google::APIClient::Method.new(self.base, k, v)
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accu
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end
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)
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end
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2010-10-07 00:02:22 +00:00
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##
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# Converts the service to a flat mapping of RPC names and method objects.
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#
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# @return [Hash] All methods available on the service.
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2010-10-07 22:38:51 +00:00
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#
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# @example
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# # Discover available methods
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# method_names = client.discovered_service('buzz').to_h.keys
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2010-09-16 23:40:08 +00:00
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def to_h
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return @hash ||= (begin
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methods_hash = {}
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self.methods.each do |method|
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methods_hash[method.rpc_name] = method
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end
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self.resources.each do |resource|
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methods_hash.merge!(resource.to_h)
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end
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methods_hash
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end)
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end
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2010-10-12 20:39:09 +00:00
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##
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# Compares two versions of a service.
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#
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# @param [Object] other The service to compare.
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#
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# @return [Integer]
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# <code>-1</code> if the service is older than <code>other</code>.
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# <code>0</code> if the service is the same as <code>other</code>.
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# <code>1</code> if the service is newer than <code>other</code>.
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# <code>nil</code> if the service cannot be compared to
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# <code>other</code>.
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def <=>(other)
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# We can only compare versions of the same service
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if other.kind_of?(self.class) && self.name == other.name
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split_version = lambda do |version|
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dotted_version = version[/^v?(\d+(.\d+)*)-?(.*?)?$/, 1]
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suffix = version[/^v?(\d+(.\d+)*)-?(.*?)?$/, 3]
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2010-10-22 22:21:26 +00:00
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if dotted_version && suffix
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[dotted_version.split('.').map { |v| v.to_i }, suffix]
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else
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[[-1], version]
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end
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2010-10-12 20:39:09 +00:00
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end
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self_sortable, self_suffix = split_version.call(self.version)
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other_sortable, other_suffix = split_version.call(other.version)
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result = self_sortable <=> other_sortable
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if result != 0
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return result
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# If the dotted versions are equal, check the suffix.
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# An omitted suffix should be sorted after an included suffix.
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elsif self_suffix == ''
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return 1
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elsif other_suffix == ''
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return -1
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else
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return self_suffix <=> other_suffix
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end
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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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2010-09-16 19:12:52 +00:00
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##
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# Returns a <code>String</code> representation of the service's state.
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#
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# @return [String] The service's state, as a <code>String</code>.
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def inspect
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sprintf(
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"#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.name
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)
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end
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end
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2010-10-07 00:02:22 +00:00
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##
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# A resource that has been described by a discovery document.
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class Resource
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##
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# Creates a description of a particular version of a resource.
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#
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# @param [Addressable::URI] base
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# The base URI for the service.
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# @param [String] resource_name
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# The identifier for the resource.
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# @param [Hash] resource_description
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# The section of the discovery document that applies to this resource.
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#
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# @return [Google::APIClient::Resource] The constructed resource object.
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2010-09-16 19:12:52 +00:00
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def initialize(base, resource_name, resource_description)
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@base = base
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@name = resource_name
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@description = resource_description
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metaclass = (class <<self; self; end)
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self.resources.each do |resource|
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method_name = Extlib::Inflection.underscore(resource.name).to_sym
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if !self.respond_to?(method_name)
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metaclass.send(:define_method, method_name) { resource }
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end
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end
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self.methods.each do |method|
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method_name = Extlib::Inflection.underscore(method.name).to_sym
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if !self.respond_to?(method_name)
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metaclass.send(:define_method, method_name) { method }
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end
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end
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end
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2010-10-07 00:02:22 +00:00
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##
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# Returns the identifier for the resource.
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#
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# @return [String] The resource identifier.
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attr_reader :name
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##
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# Returns the parsed section of the discovery document that applies to
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# this resource.
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#
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# @return [Hash] The resource description.
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attr_reader :description
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##
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# Returns the base URI for this resource.
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#
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# @return [Addressable::URI] The base URI that methods are joined to.
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attr_reader :base
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2010-09-16 19:12:52 +00:00
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2010-10-07 00:02:22 +00:00
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##
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# A list of sub-resources available on this resource.
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#
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# @return [Array] A list of {Google::APIClient::Resource} objects.
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2010-09-16 19:12:52 +00:00
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def resources
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return @resources ||= (
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(self.description['resources'] || []).inject([]) do |accu, (k, v)|
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accu << ::Google::APIClient::Resource.new(self.base, k, v)
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accu
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end
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)
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end
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2010-10-07 00:02:22 +00:00
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##
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# A list of methods available on this resource.
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#
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# @return [Array] A list of {Google::APIClient::Method} objects.
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2010-09-16 19:12:52 +00:00
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def methods
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return @methods ||= (
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(self.description['methods'] || []).inject([]) do |accu, (k, v)|
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accu << ::Google::APIClient::Method.new(self.base, k, v)
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accu
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end
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)
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end
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2010-10-07 00:02:22 +00:00
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##
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# Converts the resource to a flat mapping of RPC names and method
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# objects.
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#
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# @return [Hash] All methods available on the resource.
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2010-09-16 23:40:08 +00:00
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def to_h
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return @hash ||= (begin
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methods_hash = {}
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self.methods.each do |method|
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methods_hash[method.rpc_name] = method
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end
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self.resources.each do |resource|
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methods_hash.merge!(resource.to_h)
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end
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methods_hash
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end)
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end
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2010-09-16 19:12:52 +00:00
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##
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# Returns a <code>String</code> representation of the resource's state.
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#
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# @return [String] The resource's state, as a <code>String</code>.
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def inspect
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sprintf(
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"#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.name
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)
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end
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end
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2010-10-07 00:02:22 +00:00
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##
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# A method that has been described by a discovery document.
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2010-09-16 19:12:52 +00:00
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class Method
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2010-10-07 00:02:22 +00:00
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##
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# Creates a description of a particular method.
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#
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# @param [Addressable::URI] base
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# The base URI for the service.
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# @param [String] method_name
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# The identifier for the method.
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# @param [Hash] method_description
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# The section of the discovery document that applies to this method.
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#
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# @return [Google::APIClient::Method] The constructed method object.
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2010-09-16 19:12:52 +00:00
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def initialize(base, method_name, method_description)
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@base = base
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@name = method_name
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@description = method_description
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end
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2010-10-07 00:02:22 +00:00
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##
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# Returns the identifier for the method.
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#
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# @return [String] The method identifier.
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attr_reader :name
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##
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# Returns the parsed section of the discovery document that applies to
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# this method.
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#
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# @return [Hash] The method description.
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attr_reader :description
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##
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# Returns the base URI for the method.
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#
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# @return [Addressable::URI]
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# The base URI that this method will be joined to.
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attr_reader :base
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2010-09-16 19:12:52 +00:00
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2010-10-07 00:02:22 +00:00
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##
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# Returns the RPC name for the method.
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#
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# @return [String] The RPC name.
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2010-09-16 23:40:08 +00:00
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def rpc_name
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return self.description['rpcName']
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end
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2010-10-07 00:02:22 +00:00
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##
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# Returns the URI template for the method. A parameter list can be
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# used to expand this into a URI.
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#
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# @return [Addressable::Template] The URI template.
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2010-09-16 19:12:52 +00:00
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def uri_template
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2010-09-28 23:09:07 +00:00
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# TODO(bobaman) We shouldn't be calling #to_s here, this should be
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# a join operation on a URI, but we have to treat these as Strings
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# because of the way the discovery document provides the URIs.
|
2010-10-07 00:02:22 +00:00
|
|
|
# This should be fixed soon.
|
2010-09-16 23:40:08 +00:00
|
|
|
return @uri_template ||=
|
2010-09-28 23:09:07 +00:00
|
|
|
Addressable::Template.new(base.to_s + self.description['pathUrl'])
|
2010-09-16 19:12:52 +00:00
|
|
|
end
|
|
|
|
|
2010-10-07 00:02:22 +00:00
|
|
|
##
|
|
|
|
# Normalizes parameters, converting to the appropriate types.
|
|
|
|
#
|
|
|
|
# @param [Hash, Array] parameters
|
|
|
|
# The parameters to normalize.
|
|
|
|
#
|
|
|
|
# @return [Hash] The normalized parameters.
|
2010-09-16 23:40:08 +00:00
|
|
|
def normalize_parameters(parameters={})
|
2010-09-16 19:12:52 +00:00
|
|
|
# Convert keys to Strings when appropriate
|
2010-09-16 23:40:08 +00:00
|
|
|
if parameters.kind_of?(Hash) || parameters.kind_of?(Array)
|
2010-10-07 00:02:22 +00:00
|
|
|
# Is a Hash or an Array a better return type? Do we ever need to
|
|
|
|
# worry about the same parameter being sent twice with different
|
|
|
|
# values?
|
2010-09-16 23:40:08 +00:00
|
|
|
parameters = parameters.inject({}) do |accu, (k, v)|
|
|
|
|
k = k.to_s if k.kind_of?(Symbol)
|
|
|
|
k = k.to_str if k.respond_to?(:to_str)
|
|
|
|
unless k.kind_of?(String)
|
|
|
|
raise TypeError, "Expected String, got #{k.class}."
|
|
|
|
end
|
|
|
|
accu[k] = v
|
|
|
|
accu
|
2010-09-16 19:12:52 +00:00
|
|
|
end
|
2010-09-16 23:40:08 +00:00
|
|
|
else
|
|
|
|
raise TypeError,
|
|
|
|
"Expected Hash or Array, got #{parameters.class}."
|
2010-09-16 19:12:52 +00:00
|
|
|
end
|
2010-09-16 23:40:08 +00:00
|
|
|
return parameters
|
|
|
|
end
|
|
|
|
|
2010-10-07 00:02:22 +00:00
|
|
|
##
|
|
|
|
# Expands the method's URI template using a parameter list.
|
|
|
|
#
|
|
|
|
# @param [Hash, Array] parameters
|
|
|
|
# The parameter list to use.
|
|
|
|
#
|
|
|
|
# @return [Addressable::URI] The URI after expansion.
|
2010-09-16 23:40:08 +00:00
|
|
|
def generate_uri(parameters={})
|
|
|
|
parameters = self.normalize_parameters(parameters)
|
|
|
|
self.validate_parameters(parameters)
|
2010-09-16 19:12:52 +00:00
|
|
|
template_variables = self.uri_template.variables
|
|
|
|
uri = self.uri_template.expand(parameters)
|
|
|
|
query_parameters = parameters.reject do |k, v|
|
|
|
|
template_variables.include?(k)
|
|
|
|
end
|
|
|
|
if query_parameters.size > 0
|
|
|
|
uri.query_values = (uri.query_values || {}).merge(query_parameters)
|
|
|
|
end
|
|
|
|
# Normalization is necessary because of undesirable percent-escaping
|
|
|
|
# during URI template expansion
|
|
|
|
return uri.normalize
|
|
|
|
end
|
|
|
|
|
2010-10-07 00:02:22 +00:00
|
|
|
##
|
|
|
|
# Generates an HTTP request for this method.
|
|
|
|
#
|
|
|
|
# @param [Hash, Array] parameters
|
|
|
|
# The parameters to send.
|
2010-10-09 02:41:38 +00:00
|
|
|
# @param [String, StringIO] body The body for the HTTP request.
|
2010-10-07 00:02:22 +00:00
|
|
|
# @param [Hash, Array] headers The HTTP headers for the request.
|
|
|
|
#
|
|
|
|
# @return [Array] The generated HTTP request.
|
2010-09-16 23:40:08 +00:00
|
|
|
def generate_request(parameters={}, body='', headers=[])
|
2010-10-09 02:41:38 +00:00
|
|
|
if body.respond_to?(:string)
|
|
|
|
body = body.string
|
|
|
|
elsif body.respond_to?(:to_str)
|
|
|
|
body = body.to_str
|
|
|
|
else
|
|
|
|
raise TypeError, "Expected String or StringIO, got #{body.class}."
|
|
|
|
end
|
|
|
|
if !headers.kind_of?(Array) && !headers.kind_of?(Hash)
|
|
|
|
raise TypeError, "Expected Hash or Array, got #{headers.class}."
|
|
|
|
end
|
2010-09-16 23:40:08 +00:00
|
|
|
method = self.description['httpMethod'] || 'GET'
|
|
|
|
uri = self.generate_uri(parameters)
|
2010-10-09 02:41:38 +00:00
|
|
|
headers = headers.to_a if headers.kind_of?(Hash)
|
2010-09-16 23:40:08 +00:00
|
|
|
return [method, uri.to_str, headers, [body]]
|
|
|
|
end
|
|
|
|
|
2010-10-09 02:41:38 +00:00
|
|
|
##
|
|
|
|
# Returns a <code>Hash</code> of the parameter descriptions for
|
|
|
|
# this method.
|
|
|
|
#
|
|
|
|
# @return [Hash] The parameter descriptions.
|
|
|
|
def parameter_descriptions
|
2010-10-13 21:16:07 +00:00
|
|
|
@parameter_descriptions ||= (
|
|
|
|
self.description['parameters'] || {}
|
|
|
|
).inject({}) { |h,(k,v)| h[k]=v; h }
|
2010-10-09 02:41:38 +00:00
|
|
|
end
|
|
|
|
|
|
|
|
##
|
|
|
|
# Returns an <code>Array</code> of the parameters for this method.
|
|
|
|
#
|
|
|
|
# @return [Array] The parameters.
|
|
|
|
def parameters
|
2010-10-13 21:16:07 +00:00
|
|
|
@parameters ||= ((
|
|
|
|
self.description['parameters'] || {}
|
|
|
|
).inject({}) { |h,(k,v)| h[k]=v; h }).keys
|
2010-10-09 02:41:38 +00:00
|
|
|
end
|
|
|
|
|
|
|
|
##
|
|
|
|
# Returns an <code>Array</code> of the required parameters for this
|
|
|
|
# method.
|
|
|
|
#
|
|
|
|
# @return [Array] The required parameters.
|
|
|
|
#
|
|
|
|
# @example
|
|
|
|
# # A list of all required parameters.
|
|
|
|
# method.required_parameters
|
|
|
|
def required_parameters
|
2010-10-13 21:16:07 +00:00
|
|
|
@required_parameters ||= ((self.parameter_descriptions.select do |k, v|
|
2010-10-09 02:41:38 +00:00
|
|
|
v['required']
|
2010-10-13 21:16:07 +00:00
|
|
|
end).inject({}) { |h,(k,v)| h[k]=v; h }).keys
|
2010-10-09 02:41:38 +00:00
|
|
|
end
|
|
|
|
|
|
|
|
##
|
|
|
|
# Returns an <code>Array</code> of the optional parameters for this
|
|
|
|
# method.
|
|
|
|
#
|
|
|
|
# @return [Array] The optional parameters.
|
|
|
|
#
|
|
|
|
# @example
|
|
|
|
# # A list of all optional parameters.
|
|
|
|
# method.optional_parameters
|
|
|
|
def optional_parameters
|
2010-10-13 21:16:07 +00:00
|
|
|
@optional_parameters ||= ((self.parameter_descriptions.reject do |k, v|
|
2010-10-09 02:41:38 +00:00
|
|
|
v['required']
|
2010-10-13 21:16:07 +00:00
|
|
|
end).inject({}) { |h,(k,v)| h[k]=v; h }).keys
|
2010-10-09 02:41:38 +00:00
|
|
|
end
|
|
|
|
|
2010-10-07 00:02:22 +00:00
|
|
|
##
|
|
|
|
# Verifies that the parameters are valid for this method. Raises an
|
|
|
|
# exception if validation fails.
|
|
|
|
#
|
|
|
|
# @param [Hash, Array] parameters
|
|
|
|
# The parameters to verify.
|
|
|
|
#
|
|
|
|
# @return [NilClass] <code>nil</code> if validation passes.
|
2010-09-16 23:40:08 +00:00
|
|
|
def validate_parameters(parameters={})
|
|
|
|
parameters = self.normalize_parameters(parameters)
|
2010-10-13 21:16:07 +00:00
|
|
|
required_variables = ((self.parameter_descriptions.select do |k, v|
|
2010-09-16 23:40:08 +00:00
|
|
|
v['required']
|
2010-10-13 21:16:07 +00:00
|
|
|
end).inject({}) { |h,(k,v)| h[k]=v; h }).keys
|
2010-09-16 23:40:08 +00:00
|
|
|
missing_variables = required_variables - parameters.keys
|
|
|
|
if missing_variables.size > 0
|
|
|
|
raise ArgumentError,
|
|
|
|
"Missing required parameters: #{missing_variables.join(', ')}."
|
|
|
|
end
|
|
|
|
parameters.each do |k, v|
|
2010-10-09 02:41:38 +00:00
|
|
|
if self.parameter_descriptions[k]
|
|
|
|
pattern = self.parameter_descriptions[k]['pattern']
|
2010-09-16 23:40:08 +00:00
|
|
|
if pattern
|
|
|
|
regexp = Regexp.new("^#{pattern}$")
|
|
|
|
if v !~ regexp
|
|
|
|
raise ArgumentError,
|
|
|
|
"Parameter '#{k}' has an invalid value: #{v}. " +
|
|
|
|
"Must match: /^#{pattern}$/."
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
|
|
return nil
|
|
|
|
end
|
|
|
|
|
2010-09-16 19:12:52 +00:00
|
|
|
##
|
|
|
|
# Returns a <code>String</code> representation of the method's state.
|
|
|
|
#
|
|
|
|
# @return [String] The method's state, as a <code>String</code>.
|
|
|
|
def inspect
|
|
|
|
sprintf(
|
2010-09-16 23:40:08 +00:00
|
|
|
"#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.rpc_name
|
2010-09-16 19:12:52 +00:00
|
|
|
)
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|
|
|
|
end
|