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module ActionWebService # :nodoc:
module API # :nodoc:
# A web service API class specifies the methods that will be available for
# invocation for an API. It also contains metadata such as the method type
# signature hints.
#
# It is not intended to be instantiated.
#
# It is attached to web service implementation classes like
# ActionWebService::Base and ActionController::Base derivatives by using
# ClassMethods#web_service_api.
class Base
# Whether to transform the public API method names into camel-cased names
class_inheritable_option :inflect_names, true
# Whether to allow ActiveRecord::Base models in <tt>:expects</tt>.
# The default is +false+, you should be aware of the security implications
# of allowing this, and ensure that you don't allow remote callers to
# easily overwrite data they should not have access to.
class_inheritable_option :allow_active_record_expects, false
# If present, the name of a method to call when the remote caller
# tried to call a nonexistent method. Semantically equivalent to
# +method_missing+.
class_inheritable_option :default_api_method
# Disallow instantiation
private_class_method :new, :allocate
class << self
# API methods have a +name+, which must be the Ruby method name to use when
# performing the invocation on the web service object.
#
# The signatures for the method input parameters and return value can
# by specified in +options+.
#
# A signature is an array of one or more parameter specifiers.
# A parameter specifier can be one of the following:
#
# * A symbol or string of representing one of the Action Web Service base types.
# See ActionWebService::Signature for a canonical list of the base types.
# * The Class object of the parameter type
# * A single-element Array containing one of the two preceding items. This
# will cause Action Web Service to treat the parameter at that position
# as an array containing only values of the given type.
# * A Hash containing as key the name of the parameter, and as value
# one of the three preceding items
#
# If no method input parameter or method return value signatures are given,
# the method is assumed to take no parameters and/or return no values of
# interest, and any values that are received by the server will be
# discarded and ignored.
#
# Valid options:
# [<tt>:expects</tt>] Signature for the method input parameters
# [<tt>:returns</tt>] Signature for the method return value
# [<tt>:expects_and_returns</tt>] Signature for both input parameters and return value
def api_method(name, options={})
validate_options([:expects, :returns, :expects_and_returns], options.keys)
if options[:expects_and_returns]
expects = options[:expects_and_returns]
returns = options[:expects_and_returns]
else
expects = options[:expects]
returns = options[:returns]
end
expects = canonical_signature(expects)
returns = canonical_signature(returns)
if expects
expects.each do |param|
klass = WS::BaseTypes.canonical_param_type_class(param)
klass = klass[0] if klass.is_a?(Array)
if klass.ancestors.include?(ActiveRecord::Base) && !allow_active_record_expects
raise(ActionWebServiceError, "ActiveRecord model classes not allowed in :expects")
end
end
end
name = name.to_sym
public_name = public_api_method_name(name)
info = { :expects => expects, :returns => returns }
write_inheritable_hash("api_methods", name => info)
write_inheritable_hash("api_public_method_names", public_name => name)
end
# Whether the given method name is a service method on this API
def has_api_method?(name)
api_methods.has_key?(name)
end
# Whether the given public method name has a corresponding service method
# on this API
def has_public_api_method?(public_name)
api_public_method_names.has_key?(public_name)
end
# The corresponding public method name for the given service method name
def public_api_method_name(name)
if inflect_names
name.to_s.camelize
else
name.to_s
end
end
# The corresponding service method name for the given public method name
def api_method_name(public_name)
api_public_method_names[public_name]
end
# A Hash containing all service methods on this API, and their
# associated metadata.
def api_methods
read_inheritable_attribute("api_methods") || {}
end
private
def api_public_method_names
read_inheritable_attribute("api_public_method_names") || {}
end
def validate_options(valid_option_keys, supplied_option_keys)
unknown_option_keys = supplied_option_keys - valid_option_keys
unless unknown_option_keys.empty?
raise(ActionWebServiceError, "Unknown options: #{unknown_option_keys}")
end
end
def canonical_signature(signature)
return nil if signature.nil?
signature.map{|spec| WS::BaseTypes.canonical_param_type_spec(spec)}
end
end
end
end
end
|
