Add length validation for debate description

Fixes issue #4013.

app/components/debates/form_component.html.erb

@@ -18,6 +18,11 @@
         <%= translations_form.text_area :description,
               maxlength: Debate.description_max_length,
               class: "html-area" %>
+        <% if @debate.errors.present? && locale == translations_form.locale %>
+          <div class="form-error is-visible html-area ">
+            <%= @debate.errors[:description][0] %>
+          </div>
+        <% end %>
       </div>
     <% end %>
   </fieldset>

app/models/concerns/measurable.rb

@@ -17,5 +17,9 @@ module Measurable
     def description_max_length
       6000
     end
+
+    def description_min_length
+      10
+    end
   end
 end

app/models/debate.rb

@@ -29,7 +29,8 @@ class Debate < ApplicationRecord
   has_many :comments, as: :commentable, inverse_of: :commentable
 
   validates_translation :title, presence: true, length: { in: 4..Debate.title_max_length }
-  validates_translation :description, presence: true, length: { in: 10..Debate.description_max_length }
+  validates_translation :description, presence: true
+  validate :description_sanitized
   validates :author, presence: true
 
   validates :terms_of_service, acceptance: { allow_nil: false }, on: :create
@@ -162,4 +163,14 @@ class Debate < ApplicationRecord
     orders << "recommendations" if Setting["feature.user.recommendations_on_debates"] && user&.recommended_debates
     orders
   end
+
+  def description_sanitized
+    real_description_length = ActionView::Base.full_sanitizer.sanitize("#{description}").squish.length
+    if real_description_length < Debate.description_min_length
+      errors.add(:description, :too_short, count: Debate.description_min_length)
+    end
+    if real_description_length > Debate.description_max_length
+      errors.add(:description, :too_long, count: Debate.description_max_length)
+    end
+  end
 end

spec/models/concerns/globalizable.rb

@@ -66,7 +66,7 @@ shared_examples_for "globalizable" do |factory_name|
       record.reload
 
       record.update!(translations_attributes: [
-        { locale: :de }.merge(fields.map { |field| [field, "Deutsch"] }.to_h)
+        { locale: :de }.merge(fields.map { |field| [field, "Deutsche Sprache"] }.to_h)
       ])
 
       record.reload
@@ -105,7 +105,7 @@ shared_examples_for "globalizable" do |factory_name|
       record.reload
 
       record.update!(translations_attributes: [
-        { id: record.translations.first.id }.merge(fields.map { |field| [field, "Cambiado"] }.to_h)
+        { id: record.translations.first.id }.merge(fields.map { |field| [field, "Actualizado"] }.to_h)
       ])
 
       record.reload
@@ -158,8 +158,8 @@ shared_examples_for "globalizable" do |factory_name|
   describe "Fallbacks" do
     before do
       I18n.with_locale(:de) do
-        record.update!(required_fields.map { |field| [field, "Deutsch"] }.to_h)
+        record.update!(required_fields.map { |field| [field, "Deutsche Sprache"] }.to_h)
-        record.update!(attribute => "Deutsch")
+        record.update!(attribute => "Deutsche Sprache")
       end
     end
 
@@ -177,7 +177,7 @@ shared_examples_for "globalizable" do |factory_name|
       Globalize.set_fallbacks_to_all_available_locales
 
       I18n.with_locale(:fr) do
-        expect(record.send(attribute)).to eq "Deutsch"
+        expect(record.send(attribute)).to eq "Deutsche Sprache"
       end
     end
 
@@ -188,7 +188,7 @@ shared_examples_for "globalizable" do |factory_name|
         { id: record.translations.find_by(locale: :en).id, _destroy: true }
       ])
 
-      expect(record.send(attribute)).to eq "Deutsch"
+      expect(record.send(attribute)).to eq "Deutsche Sprache"
     end
   end
 end

spec/models/debate_spec.rb

@@ -45,10 +45,15 @@ describe Debate do
     end
 
     it "is not valid when very short" do
-      debate.description = "abc"
+      debate.description = "<a><h1><u>abc</u></h1></a>"
       expect(debate).not_to be_valid
     end
 
+    it "is valid when very long and sanitized" do
+      debate.description = "<a><h1>a</h1></a>" * 6000
+      expect(debate).to be_valid
+    end
+
     it "is not valid when very long" do
       debate.description = "a" * 6001
       expect(debate).not_to be_valid

spec/system/debates_spec.rb

@@ -259,14 +259,14 @@ describe "Debates" do
 
     visit new_debate_path
     fill_in "Debate title", with: "Testing an attack"
-    fill_in "Initial debate text", with: "<p>This is <script>alert('an attack');</script></p>"
+    fill_in "Initial debate text", with: "<p>This is a JS <script>alert('an attack');</script></p>"
     check "debate_terms_of_service"
 
     click_button "Start a debate"
 
     expect(page).to have_content "Debate created successfully."
     expect(page).to have_content "Testing an attack"
-    expect(page.html).to include "<p>This is alert('an attack');</p>"
+    expect(page.html).to include "<p>This is a JS alert('an attack');</p>"
     expect(page.html).not_to include "<script>alert('an attack');</script>"
     expect(page.html).not_to include "&lt;p&gt;This is"
   end