X-Git-Url: https://git.njae.me.uk/?a=blobdiff_plain;f=vendor%2Frails%2Factionpack%2Flib%2Faction_controller%2Fmime_responds.rb;fp=vendor%2Frails%2Factionpack%2Flib%2Faction_controller%2Fmime_responds.rb;h=b755363873223db27aa6a6ea33282074bb35c65a;hb=437aa336c44c74a30aeea16a06743c32747ed661;hp=0000000000000000000000000000000000000000;hpb=97a0772b06264134cfe38e7494f9427efe0840a0;p=feedcatcher.git

diff --git a/vendor/rails/actionpack/lib/action_controller/mime_responds.rb b/vendor/rails/actionpack/lib/action_controller/mime_responds.rb
new file mode 100644
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+++ b/vendor/rails/actionpack/lib/action_controller/mime_responds.rb
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+module ActionController #:nodoc:
+  module MimeResponds #:nodoc:
+    def self.included(base)
+      base.module_eval do
+        include ActionController::MimeResponds::InstanceMethods
+      end
+    end
+
+    module InstanceMethods
+      # Without web-service support, an action which collects the data for displaying a list of people
+      # might look something like this:
+      #
+      #   def index
+      #     @people = Person.find(:all)
+      #   end
+      #
+      # Here's the same action, with web-service support baked in:
+      #
+      #   def index
+      #     @people = Person.find(:all)
+      #
+      #     respond_to do |format|
+      #       format.html
+      #       format.xml { render :xml => @people.to_xml }
+      #     end
+      #   end
+      #
+      # What that says is, "if the client wants HTML in response to this action, just respond as we
+      # would have before, but if the client wants XML, return them the list of people in XML format."
+      # (Rails determines the desired response format from the HTTP Accept header submitted by the client.)
+      #
+      # Supposing you have an action that adds a new person, optionally creating their company
+      # (by name) if it does not already exist, without web-services, it might look like this:
+      #
+      #   def create
+      #     @company = Company.find_or_create_by_name(params[:company][:name])
+      #     @person  = @company.people.create(params[:person])
+      #
+      #     redirect_to(person_list_url)
+      #   end
+      #
+      # Here's the same action, with web-service support baked in:
+      #
+      #   def create
+      #     company  = params[:person].delete(:company)
+      #     @company = Company.find_or_create_by_name(company[:name])
+      #     @person  = @company.people.create(params[:person])
+      #
+      #     respond_to do |format|
+      #       format.html { redirect_to(person_list_url) }
+      #       format.js
+      #       format.xml  { render :xml => @person.to_xml(:include => @company) }
+      #     end
+      #   end
+      #
+      # If the client wants HTML, we just redirect them back to the person list. If they want Javascript
+      # (format.js), then it is an RJS request and we render the RJS template associated with this action.
+      # Lastly, if the client wants XML, we render the created person as XML, but with a twist: we also
+      # include the person's company in the rendered XML, so you get something like this:
+      #
+      #   <person>
+      #     <id>...</id>
+      #     ...
+      #     <company>
+      #       <id>...</id>
+      #       <name>...</name>
+      #       ...
+      #     </company>
+      #   </person>
+      #
+      # Note, however, the extra bit at the top of that action:
+      #
+      #   company  = params[:person].delete(:company)
+      #   @company = Company.find_or_create_by_name(company[:name])
+      #
+      # This is because the incoming XML document (if a web-service request is in process) can only contain a
+      # single root-node. So, we have to rearrange things so that the request looks like this (url-encoded):
+      #
+      #   person[name]=...&person[company][name]=...&...
+      #
+      # And, like this (xml-encoded):
+      #
+      #   <person>
+      #     <name>...</name>
+      #     <company>
+      #       <name>...</name>
+      #     </company>
+      #   </person>
+      #
+      # In other words, we make the request so that it operates on a single entity's person. Then, in the action,
+      # we extract the company data from the request, find or create the company, and then create the new person
+      # with the remaining data.
+      #
+      # Note that you can define your own XML parameter parser which would allow you to describe multiple entities
+      # in a single request (i.e., by wrapping them all in a single root node), but if you just go with the flow
+      # and accept Rails' defaults, life will be much easier.
+      #
+      # If you need to use a MIME type which isn't supported by default, you can register your own handlers in
+      # environment.rb as follows.
+      #
+      #   Mime::Type.register "image/jpg", :jpg
+      def respond_to(*types, &block)
+        raise ArgumentError, "respond_to takes either types or a block, never both" unless types.any? ^ block
+        block ||= lambda { |responder| types.each { |type| responder.send(type) } }
+        responder = Responder.new(self)
+        block.call(responder)
+        responder.respond
+      end
+    end
+
+    class Responder #:nodoc:
+      def initialize(controller)
+        @controller = controller
+        @request    = controller.request
+        @response   = controller.response
+
+        if ActionController::Base.use_accept_header
+          @mime_type_priority = Array(Mime::Type.lookup_by_extension(@request.parameters[:format]) || @request.accepts)
+        else
+          @mime_type_priority = [@request.format]
+        end
+
+        @order     = []
+        @responses = {}
+      end
+
+      def custom(mime_type, &block)
+        mime_type = mime_type.is_a?(Mime::Type) ? mime_type : Mime::Type.lookup(mime_type.to_s)
+
+        @order << mime_type
+
+        @responses[mime_type] ||= Proc.new do
+          @response.template.template_format = mime_type.to_sym
+          @response.content_type = mime_type.to_s
+          block_given? ? block.call : @controller.send(:render, :action => @controller.action_name)
+        end
+      end
+
+      def any(*args, &block)
+        if args.any?
+          args.each { |type| send(type, &block) }
+        else
+          custom(@mime_type_priority.first, &block)
+        end
+      end
+      
+      def self.generate_method_for_mime(mime)
+        sym = mime.is_a?(Symbol) ? mime : mime.to_sym
+        const = sym.to_s.upcase
+        class_eval <<-RUBY, __FILE__, __LINE__ + 1
+          def #{sym}(&block)                # def html(&block)
+            custom(Mime::#{const}, &block)  #   custom(Mime::HTML, &block)
+          end                               # end
+        RUBY
+      end
+
+      Mime::SET.each do |mime|
+        generate_method_for_mime(mime)
+      end
+
+      def method_missing(symbol, &block)
+        mime_constant = Mime.const_get(symbol.to_s.upcase)
+      
+        if Mime::SET.include?(mime_constant)
+          self.class.generate_method_for_mime(mime_constant)
+          send(symbol, &block)
+        else
+          super
+        end
+      end
+
+      def respond
+        for priority in @mime_type_priority
+          if priority == Mime::ALL
+            @responses[@order.first].call
+            return
+          else
+            if @responses[priority]
+              @responses[priority].call
+              return # mime type match found, be happy and return
+            end
+          end
+        end
+
+        if @order.include?(Mime::ALL)
+          @responses[Mime::ALL].call
+        else
+          @controller.send :head, :not_acceptable
+        end
+      end
+    end
+  end
+end