287 lines
9.3 KiB
Ruby
287 lines
9.3 KiB
Ruby
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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 'addressable/uri'
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require 'addressable/template'
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require 'google/api_client/errors'
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module Google
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class APIClient
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##
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# A method that has been described by a discovery document.
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class Method
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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] method_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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def initialize(method_base, method_name, discovery_document)
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@method_base = method_base
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@name = method_name
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@discovery_document = discovery_document
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end
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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 :method_base
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##
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# Updates the method with the new base.
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#
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# @param [Addressable::URI, #to_str, String] new_base
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# The new base URI to use for the method.
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def method_base=(new_method_base)
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@method_base = Addressable::URI.parse(new_method_base)
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@uri_template = nil
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end
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##
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# Returns the method ID.
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#
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# @return [String] The method identifier.
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def id
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return @discovery_document['id']
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end
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##
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# Returns the HTTP method or 'GET' if none is specified.
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#
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# @return [String] The HTTP method that will be used in the request.
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def http_method
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return @discovery_document['httpMethod'] || 'GET'
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end
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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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def uri_template
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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.
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# This should be fixed soon.
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return @uri_template ||= Addressable::Template.new(
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self.method_base + @discovery_document['path']
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)
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end
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##
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# Normalizes parameters, converting to the appropriate types.
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#
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# @param [Hash, Array] parameters
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# The parameters to normalize.
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#
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# @return [Hash] The normalized parameters.
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def normalize_parameters(parameters={})
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# Convert keys to Strings when appropriate
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if parameters.kind_of?(Hash) || parameters.kind_of?(Array)
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# Is a Hash or an Array a better return type? Do we ever need to
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# worry about the same parameter being sent twice with different
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# values?
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parameters = parameters.inject({}) do |accu, (k, v)|
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k = k.to_s if k.kind_of?(Symbol)
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k = k.to_str if k.respond_to?(:to_str)
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unless k.kind_of?(String)
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raise TypeError, "Expected String, got #{k.class}."
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end
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accu[k] = v
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accu
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end
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else
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raise TypeError,
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"Expected Hash or Array, got #{parameters.class}."
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end
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return parameters
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end
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##
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# Expands the method's URI template using a parameter list.
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#
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# @param [Hash, Array] parameters
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# The parameter list to use.
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#
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# @return [Addressable::URI] The URI after expansion.
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def generate_uri(parameters={})
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parameters = self.normalize_parameters(parameters)
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self.validate_parameters(parameters)
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template_variables = self.uri_template.variables
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uri = self.uri_template.expand(parameters)
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query_parameters = parameters.reject do |k, v|
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template_variables.include?(k)
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end
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if query_parameters.size > 0
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uri.query_values = (uri.query_values || {}).merge(query_parameters)
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end
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# Normalization is necessary because of undesirable percent-escaping
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# during URI template expansion
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return uri.normalize
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end
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##
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# Generates an HTTP request for this method.
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#
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# @param [Hash, Array] parameters
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# The parameters to send.
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# @param [String, StringIO] body The body for the HTTP request.
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# @param [Hash, Array] headers The HTTP headers for the request.
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#
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# @return [Array] The generated HTTP request.
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def generate_request(parameters={}, body='', headers=[])
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if body.respond_to?(:string)
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body = body.string
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elsif body.respond_to?(:to_str)
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body = body.to_str
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else
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raise TypeError, "Expected String or StringIO, got #{body.class}."
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end
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if !headers.kind_of?(Array) && !headers.kind_of?(Hash)
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raise TypeError, "Expected Hash or Array, got #{headers.class}."
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end
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method = self.http_method
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uri = self.generate_uri(parameters)
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headers = headers.to_a if headers.kind_of?(Hash)
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return [method, uri.to_str, headers, [body]]
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end
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##
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# Returns a <code>Hash</code> of the parameter descriptions for
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# this method.
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#
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# @return [Hash] The parameter descriptions.
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def parameter_descriptions
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@parameter_descriptions ||= (
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@discovery_document['parameters'] || {}
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).inject({}) { |h,(k,v)| h[k]=v; h }
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end
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##
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# Returns an <code>Array</code> of the parameters for this method.
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#
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# @return [Array] The parameters.
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def parameters
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@parameters ||= ((
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@discovery_document['parameters'] || {}
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).inject({}) { |h,(k,v)| h[k]=v; h }).keys
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end
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##
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# Returns an <code>Array</code> of the required parameters for this
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# method.
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#
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# @return [Array] The required parameters.
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#
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# @example
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# # A list of all required parameters.
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# method.required_parameters
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def required_parameters
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@required_parameters ||= ((self.parameter_descriptions.select do |k, v|
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v['required']
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end).inject({}) { |h,(k,v)| h[k]=v; h }).keys
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end
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##
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# Returns an <code>Array</code> of the optional parameters for this
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# method.
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#
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# @return [Array] The optional parameters.
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#
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# @example
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# # A list of all optional parameters.
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# method.optional_parameters
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def optional_parameters
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@optional_parameters ||= ((self.parameter_descriptions.reject do |k, v|
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v['required']
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end).inject({}) { |h,(k,v)| h[k]=v; h }).keys
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end
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##
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# Verifies that the parameters are valid for this method. Raises an
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# exception if validation fails.
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#
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# @param [Hash, Array] parameters
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# The parameters to verify.
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#
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# @return [NilClass] <code>nil</code> if validation passes.
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def validate_parameters(parameters={})
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parameters = self.normalize_parameters(parameters)
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required_variables = ((self.parameter_descriptions.select do |k, v|
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v['required']
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end).inject({}) { |h,(k,v)| h[k]=v; h }).keys
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missing_variables = required_variables - parameters.keys
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if missing_variables.size > 0
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raise ArgumentError,
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"Missing required parameters: #{missing_variables.join(', ')}."
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end
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parameters.each do |k, v|
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if self.parameter_descriptions[k]
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enum = self.parameter_descriptions[k]['enum']
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if enum && !enum.include?(v)
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raise ArgumentError,
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"Parameter '#{k}' has an invalid value: #{v}. " +
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"Must be one of #{enum.inspect}."
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end
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pattern = self.parameter_descriptions[k]['pattern']
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if pattern
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regexp = Regexp.new("^#{pattern}$")
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if v !~ regexp
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raise ArgumentError,
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"Parameter '#{k}' has an invalid value: #{v}. " +
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"Must match: /^#{pattern}$/."
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end
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end
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end
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end
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return nil
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end
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##
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# Returns a <code>String</code> representation of the method's state.
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#
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# @return [String] The method's state, as a <code>String</code>.
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def inspect
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sprintf(
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"#<%s:%#0x ID:%s>",
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self.class.to_s, self.object_id, self.id
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)
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end
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end
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end
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end
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