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

db/migrate/20201218054746_add_obfuscate_to_domain_blocks.rb

@@ -0,0 +1,15 @@
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class AddObfuscateToDomainBlocks < ActiveRecord::Migration[5.2]
+  include Mastodon::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    safety_assured { add_column_with_default :domain_blocks, :obfuscate, :boolean, default: false, allow_null: false }
+  end
+
+  def down
+    remove_column :domain_blocks, :obfuscate
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_12_06_004238) do
+ActiveRecord::Schema.define(version: 2020_12_18_054746) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -360,6 +360,7 @@ ActiveRecord::Schema.define(version: 2020_12_06_004238) do
     t.boolean "reject_reports", default: false, null: false
     t.text "private_comment"
     t.text "public_comment"
+    t.boolean "obfuscate", default: false, null: false
     t.index ["domain"], name: "index_domain_blocks_on_domain", unique: true
   end