Add option to obfuscate domain name in public list of domain blocks (#15355)

- Replace the middle of the domain with * characters (except for periods)
- Add SHA-256 digest of the domain name in tooltip

app/controllers/admin/domain_blocks_controller.rb

@@ -74,11 +74,11 @@ module Admin
     end
 
     def update_params
-      params.require(:domain_block).permit(:severity, :reject_media, :reject_reports, :private_comment, :public_comment)
+      params.require(:domain_block).permit(:severity, :reject_media, :reject_reports, :private_comment, :public_comment, :obfuscate)
     end
 
     def resource_params
-      params.require(:domain_block).permit(:domain, :severity, :reject_media, :reject_reports, :private_comment, :public_comment)
+      params.require(:domain_block).permit(:domain, :severity, :reject_media, :reject_reports, :private_comment, :public_comment, :obfuscate)
     end
   end
 end

app/models/domain_block.rb

@@ -12,6 +12,7 @@
 #  reject_reports  :boolean          default(FALSE), not null
 #  private_comment :text
 #  public_comment  :text
+#  obfuscate       :boolean          default(FALSE), not null
 #
 
 class DomainBlock < ApplicationRecord
@@ -73,4 +74,23 @@ class DomainBlock < ApplicationRecord
     scope = suspend? ? accounts.where(suspended_at: created_at) : accounts.where(silenced_at: created_at)
     scope.count
   end
+
+  def public_domain
+    return domain unless obfuscate?
+
+    length        = domain.size
+    visible_ratio = length / 4
+
+    domain.chars.map.with_index do |chr, i|
+      if i > visible_ratio && i < length - visible_ratio && chr != '.'
+        '*'
+      else
+        chr
+      end
+    end.join
+  end
+
+  def domain_digest
+    Digest::SHA256.hexdigest(domain)
+  end
 end

app/views/about/_domain_blocks.html.haml

@@ -7,6 +7,6 @@
     - domain_blocks.each do |domain_block|
       %tr
         %td.nowrap
-          %span{ title: domain_block.domain }= domain_block.domain
+          %span{ title: "SHA-256: #{domain_block.domain_digest}" }= domain_block.public_domain
         %td
           = domain_block.public_comment if display_blocks_rationale?

app/views/admin/domain_blocks/edit.html.haml

@@ -20,6 +20,9 @@
   .fields-group
     = f.input :reject_reports, as: :boolean, wrapper: :with_label, label: I18n.t('admin.domain_blocks.reject_reports'), hint: I18n.t('admin.domain_blocks.reject_reports_hint')
 
+  .fields-group
+    = f.input :obfuscate, as: :boolean, wrapper: :with_label, label: I18n.t('admin.domain_blocks.obfuscate'), hint: I18n.t('admin.domain_blocks.obfuscate_hint')
+
   .field-group
     = f.input :private_comment, wrapper: :with_label, label: I18n.t('admin.domain_blocks.private_comment'), hint: t('admin.domain_blocks.private_comment_hint'), rows: 6
 

app/views/admin/domain_blocks/new.html.haml

@@ -20,6 +20,9 @@
   .fields-group
     = f.input :reject_reports, as: :boolean, wrapper: :with_label, label: I18n.t('admin.domain_blocks.reject_reports'), hint: I18n.t('admin.domain_blocks.reject_reports_hint')
 
+  .fields-group
+    = f.input :obfuscate, as: :boolean, wrapper: :with_label, label: I18n.t('admin.domain_blocks.obfuscate'), hint: I18n.t('admin.domain_blocks.obfuscate_hint')
+
   .field-group
     = f.input :private_comment, wrapper: :with_label, label: I18n.t('admin.domain_blocks.private_comment'), hint: t('admin.domain_blocks.private_comment_hint'), rows: 6