add default user signatures

lib/ability.rb

@@ -11,6 +11,7 @@ class Ability
     can :manage, User, account_id: user.account_id
     can :manage, EncryptedConfig, account_id: user.account_id
     can :manage, AccountConfig, account_id: user.account_id
+    can :manage, UserConfig, user_id: user.id
     can :manage, Account, id: user.account_id
     can :manage, AccessToken, user_id: user.id
   end

lib/submitters/maybe_update_default_values.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+module Submitters
+  module MaybeUpdateDefaultValues
+    module_function
+
+    def call(submitter, current_user)
+      user =
+        if current_user && current_user.email == submitter.email
+          current_user
+        else
+          submitter.account.users.find_by(email: submitter.email)
+        end
+
+      return if user.blank?
+
+      fields = submitter.submission.template_fields || submitter.submission.template.fields
+
+      fields.each do |field|
+        next if field['submitter_uuid'] != submitter.uuid
+
+        submitter.values[field['uuid']] ||= get_default_value_for_field(field, user, submitter)
+      end
+
+      submitter.save!
+    end
+
+    def get_default_value_for_field(field, user, submitter)
+      field_name = field['name'].to_s.downcase
+
+      if field_name.in?(['full name', 'legal name'])
+        user.full_name
+      elsif field_name == 'first name'
+        user.first_name
+      elsif field_name == 'last name'
+        user.last_name
+      elsif field['type'] == 'signature' && (signature = UserConfigs.load_signature(user))
+        attachment = ActiveStorage::Attachment.find_or_create_by!(
+          blob_id: signature.blob_id,
+          name: 'attachments',
+          record: submitter
+        )
+
+        attachment.uuid
+      end
+    end
+  end
+end

lib/user_configs.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+module UserConfigs
+  module_function
+
+  def load_signature(user)
+    return if user.blank?
+
+    uuid = user.user_configs.find_or_initialize_by(key: UserConfig::SIGNATURE_KEY).value
+
+    ActiveStorage::Attachment.find_by(uuid:, record: user, name: 'signature') if uuid.present?
+  end
+end