be explicit about the object to do #instance_eval in for delegated dispatching,

clean up iterations to use #zip (bitsweat), 


git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@1090 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 204 insertions, 1 deletions

diff --git a/actionwebservice/lib/action_web_service/api.rb b/actionwebservice/lib/action_web_service/api.rb
index ab8b696ab4..4548856d86 100644
--- a/actionwebservice/lib/action_web_service/api.rb
+++ b/actionwebservice/lib/action_web_service/api.rb
@@ -1 +1,204 @@
-require 'action_web_service/api/base'
+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
+        include ActionWebService::SignatureTypes
+
+        # 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 |type|
+              type = type.element_type if type.is_a?(ArrayType)
+              if type.type_class.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)
+          method = Method.new(name, public_name, expects, returns)
+          write_inheritable_hash("api_methods", name => method)
+          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
+
+        # The Method instance for the given public API method name, if any
+        def public_api_method_instance(public_method_name)
+          api_method_instance(api_method_name(public_method_name))
+        end
+
+        # The Method instance for the given API method name, if any
+        def api_method_instance(method_name)
+          api_methods[method_name]
+        end
+
+        # The Method instance for the default API method, if any
+        def default_api_method_instance
+          return nil unless name = default_api_method
+          instance = read_inheritable_attribute("default_api_method_instance")
+          if instance && instance.name == name
+            return instance
+          end
+          instance = Method.new(name, public_api_method_name(name), nil, nil)
+          write_inheritable_attribute("default_api_method_instance", instance)
+          instance
+        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
+      end
+    end
+
+    # Represents an API method and its associated metadata, and provides functionality
+    # to assist in commonly performed API method tasks.
+    class Method
+      attr :name
+      attr :public_name
+      attr :expects
+      attr :returns
+
+      def initialize(name, public_name, expects, returns)
+        @name = name
+        @public_name = public_name
+        @expects = expects
+        @returns = returns
+        @caster = ActionWebService::Casting::BaseCaster.new(self)
+      end
+      
+      # The list of parameter names for this method
+      def param_names
+        return [] unless @expects
+        @expects.map{ |type| type.name }
+      end
+
+      # Casts a set of Ruby values into the expected Ruby values
+      def cast_expects(params)
+        @caster.cast_expects(params)
+      end
+
+      # Cast a Ruby return value into the expected Ruby value
+      def cast_returns(return_value)
+        @caster.cast_returns(return_value)
+      end
+
+      # String representation of this method
+      def to_s
+        fqn = ""
+        fqn << (@returns ? (friendly_param(@returns[0], false) + " ") : "void ")
+        fqn << "#{@public_name}("
+        fqn << @expects.map{ |p| friendly_param(p) }.join(", ") if @expects
+        fqn << ")"
+        fqn
+      end
+
+      private
+        def friendly_param(type, show_name=true)
+          name = type.name.to_s
+          type_type = type.array?? type.element_type.type.to_s : type.type.to_s
+          str = type.array?? (type_type + '[]') : type_type
+          show_name ? (str + " " + name) : str
+        end
+    end
+  end
+end