Ensure url field validates properly and accepts empty inputs

lib/custom_wizard/validators/update.rb

@@ -1,3 +1,5 @@
+require 'addressable/uri'
+
 class ::CustomWizard::UpdateValidator
   attr_reader :updater
   
@@ -37,7 +39,7 @@ class ::CustomWizard::UpdateValidator
       @updater.errors.add(field_id, I18n.t('wizard.field.too_long', label: label, max: max_length.to_i))
     end
 
-    if is_url_type(field) && !check_if_url(value)
+    if is_url_type(field) && value.present? && !check_if_url(value)
       @updater.errors.add(field_id, I18n.t('wizard.field.not_url', label: label))
     end
 
@@ -110,9 +112,14 @@ class ::CustomWizard::UpdateValidator
   def is_url_type(field)
     ['url'].include? field.type
   end
-
-  def check_if_url(value)
-    value =~ URI::regexp
+  
+  SCHEMES ||= %w(http https)
+  
+  def check_if_url(url)
+    parsed = Addressable::URI.parse(url) or return false
+    SCHEMES.include?(parsed.scheme)
+  rescue Addressable::URI::InvalidURIError
+    false
   end
   
   def standardise_boolean(value)

spec/components/custom_wizard/update_validator_spec.rb

@@ -10,11 +10,7 @@ describe CustomWizard::UpdateValidator do
   }
   
   before do
-    CustomWizard::Template.save(
-      JSON.parse(File.open(
-        "#{Rails.root}/plugins/discourse-custom-wizard/spec/fixtures/wizard.json"
-      ).read),
-    skip_jobs: true)
+    CustomWizard::Template.save(template, skip_jobs: true)
     @template = CustomWizard::Template.find('super_mega_fun_wizard')
   end
   
@@ -114,4 +110,25 @@ describe CustomWizard::UpdateValidator do
       updater.errors.messages[:step_1_field_2].first
     ).to eq(I18n.t('wizard.field.required', label: 'Textarea')) 
   end
+  
+  it 'validates url fields' do
+    updater = perform_validation('step_2', step_2_field_6: 'https://discourse.com')
+    expect(
+      updater.errors.messages[:step_2_field_6].first
+    ).to eq(nil)
+  end
+  
+  it 'does not validate url fields with non-url inputs' do
+    updater = perform_validation('step_2', step_2_field_6: 'discourse')
+    expect(
+      updater.errors.messages[:step_2_field_6].first
+    ).to eq(I18n.t('wizard.field.not_url', label: 'Url'))
+  end
+  
+  it 'validates empty url fields' do
+    updater = perform_validation('step_2', step_2_field_6: '')
+    expect(
+      updater.errors.messages[:step_2_field_6].first
+    ).to eq(nil)
+  end
 end

spec/fixtures/wizard.json

@@ -81,6 +81,11 @@
           "label": "Checkbox",
           "type": "checkbox"
         },
+        {
+          "id": "step_2_field_6",
+          "label": "Url",
+          "type": "url"
+        },
         {
           "id": "step_2_field_7",
           "label": "Upload",