1 # Copyright 2010 Google Inc.
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
16 require 'addressable/uri'
17 require 'addressable/template'
18 require 'extlib/inflection'
23 # An exception that is raised if a method is called with missing or
24 # invalid parameter values.
25 class ValidationError < StandardError
29 # A service that has been described by a discovery document.
33 # Creates a description of a particular version of a service.
35 # @param [String] service_name
36 # The identifier for the service. Note that while this frequently
37 # matches the first segment of all of the service's RPC names, this
38 # should not be assumed. There is no requirement that these match.
39 # @param [String] service_version
40 # The identifier for the service version.
41 # @param [Hash] service_description
42 # The section of the discovery document that applies to this service
45 # @return [Google::APIClient::Service] The constructed service object.
46 def initialize(service_name, service_version, service_description)
48 @version = service_version
49 @description = service_description
50 metaclass = (class <<self; self; end)
51 self.resources.each do |resource|
52 method_name = Extlib::Inflection.underscore(resource.name).to_sym
53 if !self.respond_to?(method_name)
54 metaclass.send(:define_method, method_name) { resource }
57 self.methods.each do |method|
58 method_name = Extlib::Inflection.underscore(method.name).to_sym
59 if !self.respond_to?(method_name)
60 metaclass.send(:define_method, method_name) { method }
66 # Returns the identifier for the service.
68 # @return [String] The service identifier.
72 # Returns the version of the service.
74 # @return [String] The service version.
78 # Returns the parsed section of the discovery document that applies to
79 # this version of the service.
81 # @return [Hash] The service description.
82 attr_reader :description
85 # Returns the base URI for this version of the service.
87 # @return [Addressable::URI] The base URI that methods are joined to.
89 return @base ||= Addressable::URI.parse(self.description['baseUrl'])
93 # A list of resources available at the root level of this version of the
96 # @return [Array] A list of {Google::APIClient::Resource} objects.
98 return @resources ||= (
99 (self.description['resources'] || []).inject([]) do |accu, (k, v)|
100 accu << ::Google::APIClient::Resource.new(self.base, k, v)
107 # A list of methods available at the root level of this version of the
110 # @return [Array] A list of {Google::APIClient::Method} objects.
112 return @methods ||= (
113 (self.description['methods'] || []).inject([]) do |accu, (k, v)|
114 accu << ::Google::APIClient::Method.new(self.base, k, v)
121 # Converts the service to a flat mapping of RPC names and method objects.
123 # @return [Hash] All methods available on the service.
125 return @hash ||= (begin
127 self.methods.each do |method|
128 methods_hash[method.rpc_name] = method
130 self.resources.each do |resource|
131 methods_hash.merge!(resource.to_h)
138 # Returns a <code>String</code> representation of the service's state.
140 # @return [String] The service's state, as a <code>String</code>.
143 # # Discover available methods
144 # method_names = client.discovered_service('buzz').to_h.keys
147 "#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.name
153 # A resource that has been described by a discovery document.
157 # Creates a description of a particular version of a resource.
159 # @param [Addressable::URI] base
160 # The base URI for the service.
161 # @param [String] resource_name
162 # The identifier for the resource.
163 # @param [Hash] resource_description
164 # The section of the discovery document that applies to this resource.
166 # @return [Google::APIClient::Resource] The constructed resource object.
167 def initialize(base, resource_name, resource_description)
169 @name = resource_name
170 @description = resource_description
171 metaclass = (class <<self; self; end)
172 self.resources.each do |resource|
173 method_name = Extlib::Inflection.underscore(resource.name).to_sym
174 if !self.respond_to?(method_name)
175 metaclass.send(:define_method, method_name) { resource }
178 self.methods.each do |method|
179 method_name = Extlib::Inflection.underscore(method.name).to_sym
180 if !self.respond_to?(method_name)
181 metaclass.send(:define_method, method_name) { method }
187 # Returns the identifier for the resource.
189 # @return [String] The resource identifier.
193 # Returns the parsed section of the discovery document that applies to
196 # @return [Hash] The resource description.
197 attr_reader :description
200 # Returns the base URI for this resource.
202 # @return [Addressable::URI] The base URI that methods are joined to.
206 # A list of sub-resources available on this resource.
208 # @return [Array] A list of {Google::APIClient::Resource} objects.
210 return @resources ||= (
211 (self.description['resources'] || []).inject([]) do |accu, (k, v)|
212 accu << ::Google::APIClient::Resource.new(self.base, k, v)
219 # A list of methods available on this resource.
221 # @return [Array] A list of {Google::APIClient::Method} objects.
223 return @methods ||= (
224 (self.description['methods'] || []).inject([]) do |accu, (k, v)|
225 accu << ::Google::APIClient::Method.new(self.base, k, v)
232 # Converts the resource to a flat mapping of RPC names and method
235 # @return [Hash] All methods available on the resource.
237 return @hash ||= (begin
239 self.methods.each do |method|
240 methods_hash[method.rpc_name] = method
242 self.resources.each do |resource|
243 methods_hash.merge!(resource.to_h)
250 # Returns a <code>String</code> representation of the resource's state.
252 # @return [String] The resource's state, as a <code>String</code>.
255 "#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.name
261 # A method that has been described by a discovery document.
265 # Creates a description of a particular method.
267 # @param [Addressable::URI] base
268 # The base URI for the service.
269 # @param [String] method_name
270 # The identifier for the method.
271 # @param [Hash] method_description
272 # The section of the discovery document that applies to this method.
274 # @return [Google::APIClient::Method] The constructed method object.
275 def initialize(base, method_name, method_description)
278 @description = method_description
282 # Returns the identifier for the method.
284 # @return [String] The method identifier.
288 # Returns the parsed section of the discovery document that applies to
291 # @return [Hash] The method description.
292 attr_reader :description
295 # Returns the base URI for the method.
297 # @return [Addressable::URI]
298 # The base URI that this method will be joined to.
302 # Returns the RPC name for the method.
304 # @return [String] The RPC name.
306 return self.description['rpcName']
310 # Returns the URI template for the method. A parameter list can be
311 # used to expand this into a URI.
313 # @return [Addressable::Template] The URI template.
315 # TODO(bobaman) We shouldn't be calling #to_s here, this should be
316 # a join operation on a URI, but we have to treat these as Strings
317 # because of the way the discovery document provides the URIs.
318 # This should be fixed soon.
319 return @uri_template ||=
320 Addressable::Template.new(base.to_s + self.description['pathUrl'])
324 # Normalizes parameters, converting to the appropriate types.
326 # @param [Hash, Array] parameters
327 # The parameters to normalize.
329 # @return [Hash] The normalized parameters.
330 def normalize_parameters(parameters={})
331 # Convert keys to Strings when appropriate
332 if parameters.kind_of?(Hash) || parameters.kind_of?(Array)
333 # Is a Hash or an Array a better return type? Do we ever need to
334 # worry about the same parameter being sent twice with different
336 parameters = parameters.inject({}) do |accu, (k, v)|
337 k = k.to_s if k.kind_of?(Symbol)
338 k = k.to_str if k.respond_to?(:to_str)
339 unless k.kind_of?(String)
340 raise TypeError, "Expected String, got #{k.class}."
347 "Expected Hash or Array, got #{parameters.class}."
353 # Expands the method's URI template using a parameter list.
355 # @param [Hash, Array] parameters
356 # The parameter list to use.
358 # @return [Addressable::URI] The URI after expansion.
359 def generate_uri(parameters={})
360 parameters = self.normalize_parameters(parameters)
361 self.validate_parameters(parameters)
362 template_variables = self.uri_template.variables
363 uri = self.uri_template.expand(parameters)
364 query_parameters = parameters.reject do |k, v|
365 template_variables.include?(k)
367 if query_parameters.size > 0
368 uri.query_values = (uri.query_values || {}).merge(query_parameters)
370 # Normalization is necessary because of undesirable percent-escaping
371 # during URI template expansion
376 # Generates an HTTP request for this method.
378 # @param [Hash, Array] parameters
379 # The parameters to send.
380 # @param [String] body The body for the HTTP request.
381 # @param [Hash, Array] headers The HTTP headers for the request.
383 # @return [Array] The generated HTTP request.
384 def generate_request(parameters={}, body='', headers=[])
385 method = self.description['httpMethod'] || 'GET'
386 uri = self.generate_uri(parameters)
387 return [method, uri.to_str, headers, [body]]
391 # Verifies that the parameters are valid for this method. Raises an
392 # exception if validation fails.
394 # @param [Hash, Array] parameters
395 # The parameters to verify.
397 # @return [NilClass] <code>nil</code> if validation passes.
398 def validate_parameters(parameters={})
399 parameters = self.normalize_parameters(parameters)
400 parameter_description = self.description['parameters'] || {}
401 required_variables = Hash[parameter_description.select do |k, v|
404 missing_variables = required_variables - parameters.keys
405 if missing_variables.size > 0
407 "Missing required parameters: #{missing_variables.join(', ')}."
409 parameters.each do |k, v|
410 if parameter_description[k]
411 pattern = parameter_description[k]['pattern']
413 regexp = Regexp.new("^#{pattern}$")
416 "Parameter '#{k}' has an invalid value: #{v}. " +
417 "Must match: /^#{pattern}$/."
426 # Returns a <code>String</code> representation of the method's state.
428 # @return [String] The method's state, as a <code>String</code>.
431 "#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.rpc_name