FIX: Add validation to disallow censored words in topic title.

app/models/topic.rb

@@ -54,6 +54,7 @@ class Topic < ActiveRecord::Base
   validates :title, :if => Proc.new { |t| t.new_record? || t.title_changed? },
                     :presence => true,
                     :topic_title_length => true,
+                    :censored_words => true,
                     :quality_title => { :unless => :private_message? },
                     :unique_among  => { :unless => Proc.new { |t| (SiteSetting.allow_duplicate_topic_titles? || t.private_message?) },
                                         :message => :has_already_been_used,

config/locales/server.en.yml

@@ -95,6 +95,8 @@ en:
       inclusion: is not included in the list
       invalid: is invalid
       is_invalid: "seems unclear, is it a complete sentence?"
+      contains_censored_words: "includes one or more of the censored words: %{censored_words}"
+      matches_censored_pattern: "matches the following censored Regex: %{censored_pattern}"
       less_than: must be less than %{count}
       less_than_or_equal_to: must be less than or equal to %{count}
       not_a_number: is not a number

lib/validators/censored_words_validator.rb

@@ -0,0 +1,15 @@
+class CensoredWordsValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    if value =~ /#{SiteSetting.censored_words}/i
+      record.errors.add(
+        attribute, :contains_censored_words,
+        censored_words: SiteSetting.censored_words
+      )
+    elsif value =~ /#{SiteSetting.censored_pattern}/i
+      record.errors.add(
+        attribute, :matches_censored_pattern,
+        censored_pattern: SiteSetting.censored_pattern
+      )
+    end
+  end
+end

spec/models/topic_spec.rb

@@ -4,12 +4,54 @@ require 'rails_helper'
 require_dependency 'post_destroyer'
 
 describe Topic do
-
   let(:now) { Time.zone.local(2013,11,20,8,0) }
   let(:user) { Fabricate(:user) }
 
+  context 'validations' do
+    let(:topic) { Fabricate.build(:topic) }
+
+    context "#title" do
       it { is_expected.to validate_presence_of :title }
 
+      describe 'censored words' do
+        site_setting(:censored_words, 'pineapple|pen')
+        site_setting(:censored_pattern, 'orange.*')
+
+        describe 'when title contains censored words' do
+          it 'should not be valid' do
+            topic.title = 'I have a Pineapple'
+
+            expect(topic).to_not be_valid
+
+            expect(topic.errors.full_messages.first).to include(I18n.t(
+              'errors.messages.contains_censored_words', censored_words: SiteSetting.censored_words
+            ))
+          end
+        end
+
+        describe 'when title matches censored pattern' do
+          it 'should not be valid' do
+            topic.title = 'I have orangEjuice'
+
+            expect(topic).to_not be_valid
+
+            expect(topic.errors.full_messages.first).to include(I18n.t(
+              'errors.messages.matches_censored_pattern', censored_pattern: SiteSetting.censored_pattern
+            ))
+          end
+        end
+
+        describe 'when title does not contain censored words' do
+          it 'should be valid' do
+            topic.title = 'The cake is a lie'
+
+            expect(topic).to be_valid
+          end
+        end
+      end
+    end
+  end
+
   it { is_expected.to rate_limit }
 
   context '#visible_post_types' do