NewPostManager determines whether to queue a post or not

lib/new_post_manager.rb

@@ -0,0 +1,66 @@
+require_dependency 'post_creator'
+require_dependency 'new_post_result'
+require_dependency 'post_enqueuer'
+
+# Determines what actions should be taken with new posts.
+#
+# The default action is to create the post, but this can be extended
+# with `NewPostManager.add_handler` to take other approaches depending
+# on the user or input.
+class NewPostManager
+
+  attr_reader :user, :args
+
+  def self.handlers
+    @handlers ||= Set.new
+  end
+
+  def self.add_handler(&block)
+    handlers << block
+  end
+
+  def initialize(user, args)
+    @user = user
+    @args = args
+  end
+
+  def perform
+
+    # Perform handlers until one returns a result
+    handled = NewPostManager.handlers.any? do |handler|
+      result = handler.call(self)
+      return result if result
+
+      false
+    end
+
+    perform_create_post unless handled
+  end
+
+  # Enqueue this post in a queue
+  def enqueue(queue)
+    result = NewPostResult.new(:enqueued)
+    enqueuer = PostEnqueuer.new(@user, queue)
+    post = enqueuer.enqueue(@args)
+
+    result.check_errors_from(enqueuer)
+    result
+  end
+
+  def perform_create_post
+    result = NewPostResult.new(:create_post)
+
+    creator = PostCreator.new(@user, @args)
+    post = creator.create
+    result.check_errors_from(creator)
+
+    if result.success?
+      result.post = post
+    else
+      @user.flag_linked_posts_as_spam if creator.spam?
+    end
+
+    result
+  end
+
+end