google-api-ruby-client/lib/google/api_client/discovery.rb

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# Copyright 2010 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
require 'json'
require 'addressable/uri'
require 'addressable/template'
require 'extlib/inflection'
module Google #:nodoc:
class APIClient #:nodoc:
class ValidationError < StandardError
end
class Service
def initialize(service_name, service_version, service_description)
@name = service_name
@version = service_version
@description = service_description
metaclass = (class <<self; self; end)
self.resources.each do |resource|
method_name = Extlib::Inflection.underscore(resource.name).to_sym
if !self.respond_to?(method_name)
metaclass.send(:define_method, method_name) { resource }
end
end
self.methods.each do |method|
method_name = Extlib::Inflection.underscore(method.name).to_sym
if !self.respond_to?(method_name)
metaclass.send(:define_method, method_name) { method }
end
end
end
attr_reader :name, :version, :description
def base
return @base ||= Addressable::URI.parse(self.description['baseUrl'])
end
def resources
return @resources ||= (
(self.description['resources'] || []).inject([]) do |accu, (k, v)|
accu << ::Google::APIClient::Resource.new(self.base, k, v)
accu
end
)
end
def methods
return @methods ||= (
(self.description['methods'] || []).inject([]) do |accu, (k, v)|
accu << ::Google::APIClient::Method.new(self.base, k, v)
accu
end
)
end
def to_h
return @hash ||= (begin
methods_hash = {}
self.methods.each do |method|
methods_hash[method.rpc_name] = method
end
self.resources.each do |resource|
methods_hash.merge!(resource.to_h)
end
methods_hash
end)
end
##
# Returns a <code>String</code> representation of the service's state.
#
# @return [String] The service's state, as a <code>String</code>.
def inspect
sprintf(
"#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.name
)
end
end
class Resource
def initialize(base, resource_name, resource_description)
@base = base
@name = resource_name
@description = resource_description
metaclass = (class <<self; self; end)
self.resources.each do |resource|
method_name = Extlib::Inflection.underscore(resource.name).to_sym
if !self.respond_to?(method_name)
metaclass.send(:define_method, method_name) { resource }
end
end
self.methods.each do |method|
method_name = Extlib::Inflection.underscore(method.name).to_sym
if !self.respond_to?(method_name)
metaclass.send(:define_method, method_name) { method }
end
end
end
attr_reader :name, :description, :base
def resources
return @resources ||= (
(self.description['resources'] || []).inject([]) do |accu, (k, v)|
accu << ::Google::APIClient::Resource.new(self.base, k, v)
accu
end
)
end
def methods
return @methods ||= (
(self.description['methods'] || []).inject([]) do |accu, (k, v)|
accu << ::Google::APIClient::Method.new(self.base, k, v)
accu
end
)
end
def to_h
return @hash ||= (begin
methods_hash = {}
self.methods.each do |method|
methods_hash[method.rpc_name] = method
end
self.resources.each do |resource|
methods_hash.merge!(resource.to_h)
end
methods_hash
end)
end
##
# Returns a <code>String</code> representation of the resource's state.
#
# @return [String] The resource's state, as a <code>String</code>.
def inspect
sprintf(
"#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.name
)
end
end
class Method
def initialize(base, method_name, method_description)
@base = base
@name = method_name
@description = method_description
end
attr_reader :name, :description, :base
def rpc_name
return self.description['rpcName']
end
def uri_template
# TODO(bobaman) We shouldn't be calling #to_s here, this should be
# a join operation on a URI, but we have to treat these as Strings
# because of the way the discovery document provides the URIs.
return @uri_template ||=
Addressable::Template.new(base.to_s + self.description['pathUrl'])
end
def normalize_parameters(parameters={})
# Convert keys to Strings when appropriate
if parameters.kind_of?(Hash) || parameters.kind_of?(Array)
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
end
else
raise TypeError,
"Expected Hash or Array, got #{parameters.class}."
end
return parameters
end
def generate_uri(parameters={})
parameters = self.normalize_parameters(parameters)
self.validate_parameters(parameters)
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
def generate_request(parameters={}, body='', headers=[])
method = self.description['httpMethod'] || 'GET'
uri = self.generate_uri(parameters)
return [method, uri.to_str, headers, [body]]
end
def validate_parameters(parameters={})
parameters = self.normalize_parameters(parameters)
parameter_description = self.description['parameters'] || {}
required_variables = Hash[parameter_description.select do |k, v|
v['required']
end].keys
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|
if parameter_description[k]
pattern = parameter_description[k]['pattern']
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
##
# 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(
"#<%s:%#0x NAME:%s>", self.class.to_s, self.object_id, self.rpc_name
)
end
end
end
end