Support for a new site setting: newuser_spam_host_threshold. If a new user posts a link

to the same host enough tiles, they will not be able to post the same link again.

Additionally, the site will flag all their previous posts with links as spam and they will
be instantly hidden via the auto hide workflow.

spec/models/user_spec.rb

@@ -266,7 +266,7 @@ describe User do
 
   describe "trust levels" do
 
-    # NOTE be sure to use build to avoid db calls 
+    # NOTE be sure to use build to avoid db calls
     let(:user) { Fabricate.build(:user, trust_level: TrustLevel.levels[:newuser]) }
 
     it "sets to the default trust level setting" do
@@ -770,6 +770,31 @@ describe User do
     end
   end
 
+  describe "flag_linked_posts_as_spam" do
+    let(:user) { Fabricate(:user) }
+    let!(:admin) { Fabricate(:admin) }
+    let!(:post) { PostCreator.new(user, title: "this topic contains spam", raw: "this post has a link: http://discourse.org").create }
+    let!(:another_post) { PostCreator.new(user, title: "this topic also contains spam", raw: "this post has a link: http://discourse.org/asdfa").create }
+    let!(:post_without_link) { PostCreator.new(user, title: "this topic shouldn't be spam", raw: "this post has no links in it.").create }
+
+    it "has flagged all the user's posts as spam" do
+      user.flag_linked_posts_as_spam
+
+      post.reload
+      post.spam_count.should == 1
+
+      another_post.reload
+      another_post.spam_count.should == 1
+
+      post_without_link.reload
+      post_without_link.spam_count.should == 0
+
+      # It doesn't raise an exception if called again
+      user.flag_linked_posts_as_spam
+
+    end
+
+  end
 
   describe 'update_time_read!' do
     let(:user) { Fabricate(:user) }