Merge pull request #2797 from postalserver/rubocop

Code Quality Improvements

.rubocop.yml

@@ -1,35 +1,174 @@
-inherit_from:
-  - https://dev.k.io/rubocop/rubocop.rails.yml
+AllCops:
+  TargetRubyVersion: 3.0
+  NewCops: enable
+  Exclude:
+    - "bin/*"
+    - "db/schema.rb"
+    # Fixes missing gem exception when running Rubocop on GitHub Actions.
+    - "vendor/bundle/**/*"
 
+# Always use double quotes
 Style/StringLiterals:
   EnforcedStyle: double_quotes
 
-Style/WordArray:
+# We prefer arrays of symbols to look like an array of symbols.
+# For example: [:one, :two, :three] as opposed to %i[one two three]
+Style/SymbolArray:
   EnforcedStyle: brackets
 
-Layout/LineLength:
+# There should always be empty lines inside a class. For example
+#
+#    class MyExample
+#
+#      def some_method
+#      end
+#
+#    end
+Layout/EmptyLinesAroundClassBody:
+  EnforcedStyle: empty_lines
+
+# We want to keep attr_* definitions separated on their own lines, rather than
+# all of them collapsed into a single attr_* call. The collapsed/grouped variant
+# is harder to read, and harder to see what's been changed in diffs.
+Style/AccessorGrouping:
   Enabled: false
 
+# Blocks are slightly different to classes, in these cases there should
+# not be new lines around the contents of the block.
+#
+#    proc do
+#      # Do something
+#    end
+Layout/EmptyLinesAroundBlockBody:
+  EnforcedStyle: no_empty_lines
+
+# Modules are the same as classes unless they're being used for namespacing
+# purposes in which case there should not be new lines.
+Layout/EmptyLinesAroundModuleBody:
+  EnforcedStyle: empty_lines_except_namespace
+
+# Space is required following -> when writing a lambda:
+#
+#    somethign = -> (var) { block }
+Layout/SpaceInLambdaLiteral:
+  EnforcedStyle: require_space
+
+Layout/FirstHashElementIndentation:
+  Enabled: false
+
+# We don't mind setting assignments in conditions so this has been disabled to
+# allow `if something = something_else` without worrying about brackets.
+Lint/AssignmentInCondition:
+  Enabled: false
+
+# Top level documentation is quite rare...
+Style/Documentation:
+  Enabled: false
+
+# We want to allow inner slashes in a regexp to be used when using /xxx/ form.
+Style/RegexpLiteral:
+  AllowInnerSlashes: true
+
+# Blocks of if statements are perfectly fine and usually more readable than
+# putting everything onto a single line just because we can.
+Style/IfUnlessModifier:
+  Enabled: false
+
+# We prefer assignments to happen within the condition rather than setting a
+# variable to the result of a condition.
+Style/ConditionalAssignment:
+  EnforcedStyle: assign_inside_condition
+  IncludeTernaryExpressions: false
+
+# Empty methods should not be compacted onto a single line
+Style/EmptyMethod:
+  EnforcedStyle: expanded
+
+# As above, just flag them.
+Lint/UnusedBlockArgument:
+  AutoCorrect: false
+
+# While we don't want to make heavy use of get_ or set_ methods we do often need
+# to use these when we want to refer to actually getting or setting something
+# (usually from another API).
+Naming/AccessorMethodName:
+  Enabled: false
+
+# If we want a boolean called :true, we should be allowed that. These are likely
+# not mistakes.
+Lint/BooleanSymbol:
+  Enabled: false
+
+# Using block.map(&:upcase) is not always the neatest way to show something. For
+# example if you have a block that just calls one thing, you don't want it
+# collapsed.
+#
+#    action do |user|
+#      user.delete
+#    end
+#
+# This should be action(&:delete) because it is not clear what is actually
+# happening without the context of knowing what the inner variable should be
+# called.
+Style/SymbolProc:
+  Enabled: false
+
+# Allow a maxmium of 5 arguments and don't include keyword arguments
+Metrics/ParameterLists:
+  Max: 5
+  CountKeywordArgs: false
+
+# This cop checks for chaining of a block after another block that spans multiple lines.
+Style/MultilineBlockChain:
+  Exclude:
+    - "spec/**/*.rb"
+
 Metrics/AbcSize:
   Enabled: false
 
+Style/FrozenStringLiteralComment:
+  Enabled: true
+  SafeAutoCorrect: true
+
+Naming/PredicateName:
+  Enabled: false
+
+Layout/LineLength:
+  # We want to reduce this back down to 120 but there are a fair number of offences
+  # of this which need addressing individually and carefully. 
+  Max: 200
+
+Metrics/PerceivedComplexity:
+  # As above, we want to enable this again in the future, but for now we'll just 
+  # disable it entirely.
+  Enabled: false
+
+Metrics/CyclomaticComplexity:
+  # As above.
+  Enabled: false
+
+Metrics/MethodLength:
+  # As above.
+  Enabled: false
+
+Metrics/BlockNesting:
+  # As above.
+  Enabled: false
+
+Style/StringConcatenation:
+  Enabled: false
+
 Metrics/BlockLength:
   Enabled: false
 
 Metrics/ClassLength:
   Enabled: false
 
-Metrics/CyclomaticComplexity:
-  Enabled: false
-
-Metrics/MethodLength:
-  Enabled: false
-
 Metrics/ModuleLength:
   Enabled: false
 
-Metrics/PerceivedComplexity:
+Lint/UnusedMethodArgument:
   Enabled: false
 
-Lint/MissingSuper:
+Style/SpecialGlobalVars:
   Enabled: false

Gemfile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 gem "authie"
 gem "autoprefixer-rails"
@@ -10,12 +12,12 @@ gem "clockwork"
 gem "dotenv-rails"
 gem "dynamic_form"
 gem "encrypto_signo"
+gem "execjs", "~> 2.7", "< 2.8"
 gem "foreman"
 gem "gelf"
 gem "haml"
 gem "hashie"
 gem "highline", require: false
-gem "execjs", '~> 2.7', "< 2.8"
 gem "jwt"
 gem "kaminari"
 gem "mail"
@@ -28,8 +30,8 @@ gem "puma"
 gem "rails", "= 6.1.7.6"
 gem "resolv", "~> 0.2.1"
 gem "secure_headers"
-gem 'sentry-rails'
-gem 'sentry-ruby'
+gem "sentry-rails"
+gem "sentry-ruby"
 gem "turbolinks", "~> 5"
 
 group :development, :assets do

Rakefile

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 

api/authenticator.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 authenticator :server do
   friendly_name "Server Authenticator"
   header "X-Server-API-Key", "The API token for a server that you wish to authenticate with.", example: "f29a45f0d4e1744ebaee"

api/controllers/messages_api_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 controller :messages do
   friendly_name "Messages API"
   description "This API allows you to access message details"
@@ -12,7 +14,7 @@ controller :messages do
     action do
       begin
         message = identity.server.message(params.id)
-      rescue Postal::MessageDB::Message::NotFound => e
+      rescue Postal::MessageDB::Message::NotFound
         error "MessageNotFound", id: params.id
       end
       structure :message, message, return: true
@@ -28,7 +30,7 @@ controller :messages do
     action do
       begin
         message = identity.server.message(params.id)
-      rescue Postal::MessageDB::Message::NotFound => e
+      rescue Postal::MessageDB::Message::NotFound
         error "MessageNotFound", id: params.id
       end
       message.deliveries.map do |d|

api/controllers/send_api_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 controller :send do
   friendly_name "Send API"
   description "This API allows you to send messages"

api/structures/delivery_api_structure.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 structure :delivery do
   basic :id
   basic :status

api/structures/message_api_structure.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 structure :message do
   basic :id
   basic :token
@@ -5,9 +7,9 @@ structure :message do
   expansion(:status) do
     {
       status: o.status,
-      last_delivery_attempt: o.last_delivery_attempt ? o.last_delivery_attempt.to_f : nil,
+      last_delivery_attempt: o.last_delivery_attempt&.to_f,
       held: o.held,
-      hold_expiry: o.hold_expiry ? o.hold_expiry.to_f : nil
+      hold_expiry: o.hold_expiry&.to_f
     }
   end
 

app/controllers/address_endpoints_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddressEndpointsController < ApplicationController
 
   include WithinOrganization

app/controllers/application_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "authie/session"
 
 class ApplicationController < ActionController::Base
@@ -46,11 +48,7 @@ class ApplicationController < ActionController::Base
   helper_method :page_title
 
   def redirect_to_with_return_to(url, *args)
-    if params[:return_to].blank? || !params[:return_to].starts_with?("/")
-      redirect_to url_with_return_to(url), *args
-    else
-      redirect_to url_with_return_to(url), *args
-    end
+    redirect_to url_with_return_to(url), *args
   end
 
   def set_timezone

app/controllers/concerns/within_organization.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module WithinOrganization
 
   extend ActiveSupport::Concern

app/controllers/credentials_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CredentialsController < ApplicationController
 
   include WithinOrganization

app/controllers/domains_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class DomainsController < ApplicationController
 
   include WithinOrganization

app/controllers/help_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class HelpController < ApplicationController
 
   include WithinOrganization

app/controllers/http_endpoints_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class HTTPEndpointsController < ApplicationController
 
   include WithinOrganization

app/controllers/ip_addresses_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IPAddressesController < ApplicationController
 
   before_action :admin_required

app/controllers/ip_pool_rules_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IPPoolRulesController < ApplicationController
 
   include WithinOrganization

app/controllers/ip_pools_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IPPoolsController < ApplicationController
 
   before_action :admin_required
@@ -31,7 +33,7 @@ class IPPoolsController < ApplicationController
   def destroy
     @ip_pool.destroy
     redirect_to_with_json :ip_pools, notice: "IP pool has been removed successfully."
-  rescue ActiveRecord::DeleteRestrictionError => e
+  rescue ActiveRecord::DeleteRestrictionError
     redirect_to_with_json [:edit, @ip_pool], alert: "IP pool cannot be removed because it still has associated addresses or servers."
   end
 

app/controllers/messages_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class MessagesController < ApplicationController
 
   include WithinOrganization
@@ -186,7 +188,7 @@ class MessagesController < ApplicationController
             if qs[:before]
               begin
                 options[:where][:timestamp][:less_than] = get_time_from_string(qs[:before]).to_f
-              rescue TimeUndetermined => e
+              rescue TimeUndetermined
                 flash.now[:alert] = "Couldn't determine time for before from '#{qs[:before]}'"
               end
             end
@@ -194,7 +196,7 @@ class MessagesController < ApplicationController
             if qs[:after]
               begin
                 options[:where][:timestamp][:greater_than] = get_time_from_string(qs[:after]).to_f
-              rescue TimeUndetermined => e
+              rescue TimeUndetermined
                 flash.now[:alert] = "Couldn't determine time for after from '#{qs[:after]}'"
               end
             end
@@ -220,6 +222,7 @@ class MessagesController < ApplicationController
         time = Chronic.parse(string, context: :past)
       end
     rescue StandardError
+      time = nil
     end
 
     raise TimeUndetermined, "Couldn't determine a suitable time from '#{string}'" if time.nil?

app/controllers/organization_ip_pools_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class OrganizationIPPoolsController < ApplicationController
 
   include WithinOrganization

app/controllers/organizations_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class OrganizationsController < ApplicationController
 
   before_action :admin_required, only: [:new, :create, :delete, :destroy]

app/controllers/routes_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RoutesController < ApplicationController
 
   include WithinOrganization

app/controllers/servers_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ServersController < ApplicationController
 
   include WithinOrganization
@@ -41,7 +43,12 @@ class ServersController < ApplicationController
 
   def update
     extra_params = [:spam_threshold, :spam_failure_threshold, :postmaster_address]
-    extra_params += [:send_limit, :allow_sender, :privacy_mode, :log_smtp_data, :outbound_spam_threshold, :message_retention_days, :raw_message_retention_days, :raw_message_retention_size] if current_user.admin?
+
+    if current_user.admin?
+      extra_params += [:send_limit, :allow_sender, :privacy_mode, :log_smtp_data, :outbound_spam_threshold,
+                       :message_retention_days, :raw_message_retention_days, :raw_message_retention_size]
+    end
+
     if @server.update(safe_params(*extra_params))
       redirect_to_with_json organization_server_path(organization, @server), notice: "Server settings have been updated"
     else

app/controllers/sessions_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SessionsController < ApplicationController
 
   layout "sub"
@@ -8,7 +10,7 @@ class SessionsController < ApplicationController
     login(User.authenticate(params[:email_address], params[:password]))
     flash[:remember_login] = true
     redirect_to_with_return_to root_path
-  rescue Postal::Errors::AuthenticationError => e
+  rescue Postal::Errors::AuthenticationError
     flash.now[:alert] = "The credentials you've provided are incorrect. Please check and try again."
     render "new"
   end

app/controllers/smtp_endpoints_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SMTPEndpointsController < ApplicationController
 
   include WithinOrganization

app/controllers/track_domains_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TrackDomainsController < ApplicationController
 
   include WithinOrganization

app/controllers/user_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UserController < ApplicationController
 
   skip_before_action :login_required, only: [:new, :create, :join]
@@ -69,7 +71,9 @@ class UserController < ApplicationController
 
     if @user.save
       if email_changed
-        redirect_to_with_json verify_path(return_to: settings_path), notice: "Your settings have been updated successfully. As you've changed, your e-mail address you'll need to verify it before you can continue."
+        redirect_to_with_json verify_path(return_to: settings_path),
+                              notice: "Your settings have been updated successfully. As you've changed, your e-mail " \
+                                      "address you'll need to verify it before you can continue."
       else
         redirect_to_with_json settings_path, notice: "Your settings have been updated successfully."
       end

app/controllers/users_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class UsersController < ApplicationController
 
   before_action :admin_required

app/controllers/webhooks_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WebhooksController < ApplicationController
 
   include WithinOrganization

app/helpers/application_helper.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ApplicationHelper
 
   def format_delivery_details(server, text)
@@ -28,7 +30,7 @@ module ApplicationHelper
       server_domains = server.domains.verified.order(:name)
       unless server_domains.empty?
         s << "<optgroup label='Server Domains'>"
-        for domain in server_domains
+        server_domains.each do |domain|
           selected = domain == selected_domain ? "selected='selected'" : ""
           s << "<option value='#{domain.id}' #{selected}>#{domain.name}</option>"
         end
@@ -38,7 +40,7 @@ module ApplicationHelper
       organization_domains = server.organization.domains.verified.order(:name)
       unless organization_domains.empty?
         s << "<optgroup label='Organization Domains'>"
-        for domain in organization_domains
+        organization_domains.each do |domain|
           selected = domain == selected_domain ? "selected='selected'" : ""
           s << "<option value='#{domain.id}' #{selected}>#{domain.name}</option>"
         end
@@ -54,7 +56,7 @@ module ApplicationHelper
       http_endpoints = server.http_endpoints.order(:name).to_a
       if http_endpoints.present?
         s << "<optgroup label='HTTP Endpoints'>"
-        for endpoint in http_endpoints
+        http_endpoints.each do |endpoint|
           value = "#{endpoint.class}##{endpoint.uuid}"
           selected = value == selected_value ? "selected='selected'" : ""
           s << "<option value='#{value}' #{selected}>#{endpoint.description}</option>"
@@ -65,7 +67,7 @@ module ApplicationHelper
       smtp_endpoints = server.smtp_endpoints.order(:name).to_a
       if smtp_endpoints.present?
         s << "<optgroup label='SMTP Endpoints'>"
-        for endpoint in smtp_endpoints
+        smtp_endpoints.each do |endpoint|
           value = "#{endpoint.class}##{endpoint.uuid}"
           selected = value == selected_value ? "selected='selected'" : ""
           s << "<option value='#{value}' #{selected}>#{endpoint.description}</option>"
@@ -76,7 +78,7 @@ module ApplicationHelper
       address_endpoints = server.address_endpoints.order(:address).to_a
       if address_endpoints.present?
         s << "<optgroup label='Address Endpoints'>"
-        for endpoint in address_endpoints
+        address_endpoints.each do |endpoint|
           value = "#{endpoint.class}##{endpoint.uuid}"
           selected = value == selected_value ? "selected='selected'" : ""
           s << "<option value='#{value}' #{selected}>#{endpoint.address}</option>"

app/jobs/action_deletion_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ActionDeletionJob < Postal::Job
 
   def perform

app/jobs/action_deletions_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ActionDeletionsJob < Postal::Job
 
   def perform

app/jobs/check_all_dns_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CheckAllDNSJob < Postal::Job
 
   def perform

app/jobs/cleanup_authie_sessions_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "authie/session"
 
 class CleanupAuthieSessionsJob < Postal::Job

app/jobs/expire_held_messages_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ExpireHeldMessagesJob < Postal::Job
 
   def perform

app/jobs/process_message_retention_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ProcessMessageRetentionJob < Postal::Job
 
   def perform

app/jobs/prune_suppression_lists_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PruneSuppressionListsJob < Postal::Job
 
   def perform

app/jobs/prune_webhook_requests_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class PruneWebhookRequestsJob < Postal::Job
 
   def perform

app/jobs/requeue_webhooks_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class RequeueWebhooksJob < Postal::Job
 
   def perform

app/jobs/send_notifications_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SendNotificationsJob < Postal::Job
 
   def perform

app/jobs/send_webhook_job.rb

@@ -1,16 +1,17 @@
+# frozen_string_literal: true
+
 class SendWebhookJob < Postal::Job
 
   def perform
     if server = Server.find(params["server_id"])
       new_items = {}
-      if params["payload"]
-        for key, value in params["payload"]
-          next unless key.to_s =~ /\A_(\w+)/
+      params["payload"]&.each do |key, value|
+        next unless key.to_s =~ /\A_(\w+)/
 
-          begin
-            new_items[::Regexp.last_match(1)] = server.message_db.message(value.to_i).webhook_hash
-          rescue Postal::MessageDB::Message::NotFound
-          end
+        begin
+          new_items[::Regexp.last_match(1)] = server.message_db.message(value.to_i).webhook_hash
+        rescue Postal::MessageDB::Message::NotFound
+          # No message found, don't do any replacement
         end
       end
 

app/jobs/sleep_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class SleepJob < Postal::Job
 
   def perform

app/jobs/tidy_raw_messages_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class TidyRawMessagesJob < Postal::Job
 
   def perform

app/jobs/unqueue_message_job.rb

@@ -1,5 +1,8 @@
+# frozen_string_literal: true
+
 class UnqueueMessageJob < Postal::Job
 
+  # rubocop:disable Layout/LineLength
   def perform
     if original_message = QueuedMessage.find_by_id(params["id"])
       if original_message.acquire_lock
@@ -91,11 +94,11 @@ class UnqueueMessageJob < Postal::Job
                 log "#{log_prefix} Message is a bounce"
                 original_messages = queued_message.message.original_messages
                 unless original_messages.empty?
-                  for original_message in queued_message.message.original_messages
-                    queued_message.message.update(bounce_for_id: original_message.id, domain_id: original_message.domain_id)
-                    queued_message.message.create_delivery("Processed", details: "This has been detected as a bounce message for <msg:#{original_message.id}>.")
-                    original_message.bounce!(queued_message.message)
-                    log "#{log_prefix} Bounce linked with message #{original_message.id}"
+                  queued_message.message.original_messages.each do |orig_msg|
+                    queued_message.message.update(bounce_for_id: orig_msg.id, domain_id: orig_msg.domain_id)
+                    queued_message.message.create_delivery("Processed", details: "This has been detected as a bounce message for <msg:#{orig_msg.id}>.")
+                    orig_msg.bounce!(queued_message.message)
+                    log "#{log_prefix} Bounce linked with message #{orig_msg.id}"
                   end
                   queued_message.destroy
                   next
@@ -421,15 +424,17 @@ class UnqueueMessageJob < Postal::Job
             end
           rescue StandardError => e
             log "#{log_prefix} Internal error: #{e.class}: #{e.message}"
-            e.backtrace.each { |e| log("#{log_prefix} #{e}") }
+            e.backtrace.each { |line| log("#{log_prefix} #{line}") }
             queued_message.retry_later
             log "#{log_prefix} Queued message was unlocked"
             if defined?(Sentry)
               Sentry.capture_exception(e, extra: { job_id: self.id, server_id: queued_message.server_id, message_id: queued_message.message_id })
             end
-            if queued_message.message
-              queued_message.message.create_delivery("Error", details: "An internal error occurred while sending this message. This message will be retried automatically. If this persists, contact support for assistance.", output: "#{e.class}: #{e.message}", log_id: "J-#{self.id}")
-            end
+            queued_message.message&.create_delivery("Error",
+                                                    details: "An internal error occurred while sending " \
+                                                             "this message. This message will be retried " \
+                                                             "automatically.",
+                                                    output: "#{e.class}: #{e.message}", log_id: "J-#{self.id}")
           end
         end
 
@@ -446,9 +451,11 @@ class UnqueueMessageJob < Postal::Job
       nil
     end
   end
+  # rubocop:enable Layout/LineLength
 
   private
 
+  # rubocop:disable Naming/MemoizedInstanceVariableName
   def cached_sender(klass, *args)
     @sender ||= begin
       sender = klass.new(*args)
@@ -456,5 +463,6 @@ class UnqueueMessageJob < Postal::Job
       sender
     end
   end
+  # rubocop:enable Naming/MemoizedInstanceVariableName
 
 end

app/jobs/webhook_delivery_job.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class WebhookDeliveryJob < Postal::Job
 
   def perform

app/mailers/app_mailer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AppMailer < ApplicationMailer
 
   def verify_email_address(user)

app/mailers/application_mailer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationMailer < ActionMailer::Base
 
   default from: "#{Postal.smtp_from_name} <#{Postal.smtp_from_address}>"

app/models/additional_route_endpoint.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: additional_route_endpoints
@@ -35,9 +37,7 @@ class AdditionalRouteEndpoint < ApplicationRecord
   end
 
   def _endpoint=(value)
-    if value.blank?
-      self.endpoint = nil
-    elsif value =~ /\#/
+    if value && value =~ /\#/
       class_name, id = value.split("#", 2)
       unless Route::ENDPOINT_TYPES.include?(class_name)
         raise Postal::Error, "Invalid endpoint class name '#{class_name}'"

app/models/address_endpoint.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: address_endpoints

app/models/application_record.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ApplicationRecord < ActiveRecord::Base
 
   self.abstract_class = true

app/models/concerns/has_authentication.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module HasAuthentication
 
   extend ActiveSupport::Concern
@@ -42,18 +44,4 @@ module HasAuthentication
 
 end
 
-class Postal::Errors::AuthenticationError < Postal::Error
-
-  attr_reader :error
-
-  def initialize(error)
-    @error = error
-  end
-
-  def to_s
-    "Authentication Failed: #{@error}"
-  end
-
-end
-
 # -*- SkipSchemaAnnotations

app/models/concerns/has_dns_checks.rb

@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 require "resolv"
 
 module HasDNSChecks
 
   def dns_ok?
-    spf_status == "OK" && dkim_status == "OK" && ["OK", "Missing"].include?(mx_status) && ["OK", "Missing"].include?(return_path_status)
+    spf_status == "OK" && dkim_status == "OK" && %w[OK Missing].include?(mx_status) && %w[OK Missing].include?(return_path_status)
   end
 
   def dns_checked?
@@ -42,12 +44,12 @@ module HasDNSChecks
 
   def check_spf_record
     result = resolver.getresources(name, Resolv::DNS::Resource::IN::TXT)
-    spf_records = result.map(&:data).select { |d| d =~ /\Av=spf1/ }
+    spf_records = result.map(&:data).grep(/\Av=spf1/)
     if spf_records.empty?
       self.spf_status = "Missing"
       self.spf_error = "No SPF record exists for this domain"
     else
-      suitable_spf_records = spf_records.select { |d| d =~ /include:\s*#{Regexp.escape(Postal.config.dns.spf_include)}/ }
+      suitable_spf_records = spf_records.grep(/include:\s*#{Regexp.escape(Postal.config.dns.spf_include)}/)
       if suitable_spf_records.empty?
         self.spf_status = "Invalid"
         self.spf_error = "An SPF record exists but it doesn't include #{Postal.config.dns.spf_include}"

app/models/concerns/has_message.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module HasMessage
 
   def self.included(base)
@@ -18,7 +20,7 @@ module HasMessage
     def include_message
       queued_messages = all.to_a
       server_ids = queued_messages.map(&:server_id).uniq
-      if server_ids.size == 0
+      if server_ids.empty?
         return []
       elsif server_ids.size > 1
         raise Postal::Error, "'include_message' can only be used on collections of messages from the same server"

app/models/concerns/has_soft_destroy.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module HasSoftDestroy
 
   def self.included(base)

app/models/concerns/has_uuid.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module HasUUID
 
   def self.included(base)

app/models/credential.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: credentials
@@ -21,7 +23,7 @@ class Credential < ApplicationRecord
 
   belongs_to :server
 
-  TYPES = ["SMTP", "API", "SMTP-IP"]
+  TYPES = %w[SMTP API SMTP-IP].freeze
 
   validates :key, presence: true, uniqueness: { case_sensitive: false }
   validates :type, inclusion: { in: TYPES }

app/models/domain.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: domains
@@ -42,15 +44,14 @@ class Domain < ApplicationRecord
 
   include HasDNSChecks
 
-  VERIFICATION_EMAIL_ALIASES = ["webmaster", "postmaster", "admin", "administrator", "hostmaster"]
+  VERIFICATION_EMAIL_ALIASES = %w[webmaster postmaster admin administrator hostmaster].freeze
+  VERIFICATION_METHODS = %w[DNS Email].freeze
 
   belongs_to :server, optional: true
   belongs_to :owner, optional: true, polymorphic: true
   has_many :routes, dependent: :destroy
   has_many :track_domains, dependent: :destroy
 
-  VERIFICATION_METHODS = ["DNS", "Email"]
-
   validates :name, presence: true, format: { with: /\A[a-z0-9\-.]*\z/ }, uniqueness: { case_sensitive: false, scope: [:owner_type, :owner_id], message: "is already added" }
   validates :verification_method, inclusion: { in: VERIFICATION_METHODS }
 
@@ -83,8 +84,8 @@ class Domain < ApplicationRecord
 
   def parent_domains
     parts = name.split(".")
-    parts[0, parts.size - 1].each_with_index.map do |p, i|
-      parts[i..-1].join(".")
+    parts[0, parts.size - 1].each_with_index.map do |_, i|
+      parts[i..].join(".")
     end
   end
 

app/models/http_endpoint.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: http_endpoints
@@ -29,8 +31,8 @@ class HTTPEndpoint < ApplicationRecord
   has_many :routes, as: :endpoint
   has_many :additional_route_endpoints, dependent: :destroy, as: :endpoint
 
-  ENCODINGS = ["BodyAsJSON", "FormData"]
-  FORMATS = ["Hash", "RawMessage"]
+  ENCODINGS = %w[BodyAsJSON FormData].freeze
+  FORMATS = %w[Hash RawMessage].freeze
 
   before_destroy :update_routes
 

app/models/incoming_message_prototype.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class IncomingMessagePrototype
 
   attr_accessor :to
@@ -22,13 +24,14 @@ class IncomingMessagePrototype
   end
 
   def route
-    @routes ||= if @to.present?
-                  uname, domain = @to.split("@", 2)
-                  uname, tag = uname.split("+", 2)
-                  @server.routes.includes(:domain).where(domains: { name: domain }, name: uname).first
-                end
+    @route ||= if @to.present?
+                 uname, domain = @to.split("@", 2)
+                 uname, _tag = uname.split("+", 2)
+                 @server.routes.includes(:domain).where(domains: { name: domain }, name: uname).first
+               end
   end
 
+  # rubocop:disable Lint/DuplicateMethods
   def attachments
     (@attachments || []).map do |attachment|
       {
@@ -38,6 +41,7 @@ class IncomingMessagePrototype
       }
     end
   end
+  # rubocop:enable Lint/DuplicateMethods
 
   def create_messages
     if valid?

app/models/ip_address.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: ip_addresses

app/models/ip_pool.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: ip_pools

app/models/ip_pool_rule.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: ip_pool_rules
@@ -66,18 +68,22 @@ class IPPoolRule < ApplicationRecord
     errors.add :ip_pool_id, "must belong to the organization"
   end
 
-  def self.address_matches?(condition, address)
-    address = Postal::Helpers.strip_name_from_address(address)
-    if condition =~ /@/
-      parts = address.split("@")
-      domain = parts.pop
-      uname = parts.join("@")
-      uname, = uname.split("+", 2)
-      condition == "#{uname}@#{domain}"
-    else
-      # Match as a domain
-      condition == address.split("@").last
+  class << self
+
+    def address_matches?(condition, address)
+      address = Postal::Helpers.strip_name_from_address(address)
+      if condition =~ /@/
+        parts = address.split("@")
+        domain = parts.pop
+        uname = parts.join("@")
+        uname, = uname.split("+", 2)
+        condition == "#{uname}@#{domain}"
+      else
+        # Match as a domain
+        condition == address.split("@").last
+      end
     end
+
   end
 
 end

app/models/organization.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: organizations
@@ -23,7 +25,7 @@
 
 class Organization < ApplicationRecord
 
-  RESERVED_PERMALINKS = ["new", "edit", "remove", "delete", "destroy", "admin", "mail", "org", "server"]
+  RESERVED_PERMALINKS = %w[new edit remove delete destroy admin mail org server].freeze
 
   INITIAL_QUOTA = 10
   INITIAL_SUPER_QUOTA = 10_000
@@ -48,7 +50,7 @@ class Organization < ApplicationRecord
   has_many :ip_pool_rules, dependent: :destroy, as: :owner
 
   after_create do
-    if pool = IPPool.default
+    if IPPool.default
       ip_pools << IPPool.default
     end
   end

app/models/organization_ip_pool.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: organization_ip_pools

app/models/organization_user.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: organization_users

app/models/outgoing_message_prototype.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "resolv"
 
 class OutgoingMessagePrototype
@@ -47,13 +49,11 @@ class OutgoingMessagePrototype
   end
 
   def find_domain
-    @domain ||= begin
-      domain = @server.authenticated_domain_for_address(@from)
-      if @server.allow_sender? && domain.nil?
-        domain = @server.authenticated_domain_for_address(@sender)
-      end
-      domain || :none
+    domain = @server.authenticated_domain_for_address(@from)
+    if @server.allow_sender? && domain.nil?
+      domain = @server.authenticated_domain_for_address(@sender)
     end
+    domain || :none
   end
 
   def to_addresses
@@ -93,6 +93,7 @@ class OutgoingMessagePrototype
     @errors || {}
   end
 
+  # rubocop:disable Lint/DuplicateMethods
   def attachments
     (@attachments || []).map do |attachment|
       {
@@ -102,6 +103,7 @@ class OutgoingMessagePrototype
       }
     end
   end
+  # rubocop:enable Lint/DuplicateMethods
 
   def validate
     @errors = []
@@ -135,7 +137,7 @@ class OutgoingMessagePrototype
     end
 
     if attachments.present?
-      attachments.each_with_index do |attachment, index|
+      attachments.each do |attachment|
         if attachment[:name].blank?
           @errors << "AttachmentMissingName" unless @errors.include?("AttachmentMissingName")
         elsif attachment[:data].blank?

app/models/queued_message.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: queued_messages

app/models/route.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: routes
@@ -22,7 +24,9 @@
 
 class Route < ApplicationRecord
 
-  MODES = ["Endpoint", "Accept", "Hold", "Bounce", "Reject"]
+  MODES = %w[Endpoint Accept Hold Bounce Reject].freeze
+  SPAM_MODES = %w[Mark Quarantine Fail].freeze
+  ENDPOINT_TYPES = %w[SMTPEndpoint HTTPEndpoint AddressEndpoint].freeze
 
   include HasUUID
 
@@ -31,9 +35,6 @@ class Route < ApplicationRecord
   belongs_to :endpoint, polymorphic: true, optional: true
   has_many :additional_route_endpoints, dependent: :destroy
 
-  SPAM_MODES = ["Mark", "Quarantine", "Fail"]
-  ENDPOINT_TYPES = ["SMTPEndpoint", "HTTPEndpoint", "AddressEndpoint"]
-
   validates :name, presence: true, format: /\A(([a-z0-9\-.]*)|(\*)|(__returnpath__))\z/
   validates :spam_mode, inclusion: { in: SPAM_MODES }
   validates :endpoint, presence: { if: proc { mode == "Endpoint" } }
@@ -115,7 +116,7 @@ class Route < ApplicationRecord
         if route.save
           seen << route.id
         else
-          route.errors.each do |field, message|
+          route.errors.each do |_, message|
             errors.add :base, message
           end
           raise ActiveRecord::RecordInvalid
@@ -200,7 +201,7 @@ class Route < ApplicationRecord
       if route = Route.includes(:domain).where(domains: { name: domain.name }, name: name).where.not(id: id).first
         errors.add :name, "is configured on the #{route.server.full_permalink} mail server"
       end
-    elsif route = Route.where(name: "__returnpath__").where.not(id: id).exists?
+    elsif Route.where(name: "__returnpath__").where.not(id: id).exists?
       errors.add :base, "A return path route already exists for this server"
     end
   end
@@ -218,12 +219,16 @@ class Route < ApplicationRecord
     errors.add :base, "Additional routes are not permitted unless the primary route is an actual endpoint"
   end
 
-  def self.find_by_name_and_domain(name, domain)
-    route = Route.includes(:domain).where(name: name, domains: { name: domain }).first
-    if route.nil?
-      route = Route.includes(:domain).where(name: "*", domains: { name: domain }).first
+  class << self
+
+    def find_by_name_and_domain(name, domain)
+      route = Route.includes(:domain).where(name: name, domains: { name: domain }).first
+      if route.nil?
+        route = Route.includes(:domain).where(name: "*", domains: { name: domain }).first
+      end
+      route
     end
-    route
+
   end
 
 end

app/models/server.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: servers
@@ -41,7 +43,8 @@
 
 class Server < ApplicationRecord
 
-  RESERVED_PERMALINKS = ["new", "all", "search", "stats", "edit", "manage", "delete", "destroy", "remove"]
+  RESERVED_PERMALINKS = %w[new all search stats edit manage delete destroy remove].freeze
+  MODES = %w[Live Development].freeze
 
   include HasUUID
   include HasSoftDestroy
@@ -62,8 +65,6 @@ class Server < ApplicationRecord
   has_many :track_domains, dependent: :destroy
   has_many :ip_pool_rules, dependent: :destroy, as: :owner
 
-  MODES = ["Live", "Development"]
-
   random_string :token, type: :chars, length: 6, unique: true, upper_letters_only: true
   default_value :permalink, -> { name ? name.parameterize : nil }
   default_value :raw_message_retention_days, -> { 30 }
@@ -155,11 +156,11 @@ class Server < ApplicationRecord
       time = Time.now.utc
       total_outgoing = 0.0
       total_bounces = 0.0
-      message_db.statistics.get(:daily, [:outgoing, :bounces], time, 30).each do |date, stat|
+      message_db.statistics.get(:daily, [:outgoing, :bounces], time, 30).each do |_, stat|
         total_outgoing += stat[:outgoing]
         total_bounces += stat[:bounces]
       end
-      total_outgoing == 0 ? 0 : (total_bounces / total_outgoing) * 100
+      total_outgoing.zero? ? 0 : (total_bounces / total_outgoing) * 100
     end
   end
 
@@ -218,6 +219,10 @@ class Server < ApplicationRecord
     }
   end
 
+  # Return the domain which can be used to authenticate emails sent from the given e-mail address.
+  #
+  #  @param address [String] an e-mail address
+  # @return [Domain, nil] the domain to use for authentication
   def authenticated_domain_for_address(address)
     return nil if address.blank?
 
@@ -226,16 +231,24 @@ class Server < ApplicationRecord
     return nil unless uname
     return nil unless domain_name
 
-    uname, = uname.split("+", 2)
+    # Find a verified domain which directly matches the domain name for the given address.
+    domain = Domain.verified
+                   .order(owner_type: :desc)
+                   .where("(owner_type = 'Organization' AND owner_id = ?) OR " \
+                          "(owner_type = 'Server' AND owner_id = ?)", organization_id, id)
+                   .where(name: domain_name)
+                   .first
 
-    # Check the server's domain
-    if domain = Domain.verified.order(owner_type: :desc).where("(owner_type = 'Organization' AND owner_id = ?) OR (owner_type = 'Server' AND owner_id = ?)", organization_id, id).where(name: domain_name).first
-      return domain
-    end
+    # If there is a matching domain, return it
+    return domain if domain
 
-    return unless any_domain = domains.verified.where(use_for_any: true).order(:name).first
+    # Otherwise, we need to look to see if there is a domain configured which can be used as the authenticated
+    # domain for any domain. This will look for domains directly within the server and return that.
+    any_domain = domains.verified.where(use_for_any: true).order(:name).first
+    return any_domain if any_domain
 
-    any_domain
+    # Return nil if we can't find anything suitable
+    nil
   end
 
   def find_authenticated_domain_from_headers(headers)

app/models/smtp_endpoint.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: smtp_endpoints
@@ -24,7 +26,7 @@ class SMTPEndpoint < ApplicationRecord
   has_many :routes, as: :endpoint
   has_many :additional_route_endpoints, dependent: :destroy, as: :endpoint
 
-  SSL_MODES = ["None", "Auto", "STARTTLS", "TLS"]
+  SSL_MODES = %w[None Auto STARTTLS TLS].freeze
 
   before_destroy :update_routes
 

app/models/statistic.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: statistics

app/models/track_domain.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: track_domains

app/models/user.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: users

app/models/user_invite.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: user_invites

app/models/webhook.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: webhooks

app/models/webhook_event.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: webhook_events
@@ -14,16 +16,16 @@
 
 class WebhookEvent < ApplicationRecord
 
-  EVENTS = [
-    "MessageSent",
-    "MessageDelayed",
-    "MessageDeliveryFailed",
-    "MessageHeld",
-    "MessageBounced",
-    "MessageLinkClicked",
-    "MessageLoaded",
-    "DomainDNSError"
-  ]
+  EVENTS = %w[
+    MessageSent
+    MessageDelayed
+    MessageDeliveryFailed
+    MessageHeld
+    MessageBounced
+    MessageLinkClicked
+    MessageLoaded
+    DomainDNSError
+  ].freeze
 
   belongs_to :webhook
 

app/models/webhook_request.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # == Schema Information
 #
 # Table name: webhook_requests
@@ -19,7 +21,7 @@ class WebhookRequest < ApplicationRecord
 
   include HasUUID
 
-  RETRIES = { 1 => 2.minutes, 2 => 3.minutes, 3 => 6.minutes, 4 => 10.minutes, 5 => 15.minutes }
+  RETRIES = { 1 => 2.minutes, 2 => 3.minutes, 3 => 6.minutes, 4 => 10.minutes, 5 => 15.minutes }.freeze
 
   belongs_to :server
   belongs_to :webhook, optional: true

bin/rails

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
 APP_PATH = File.expand_path("../config/application", __dir__)
 require_relative "../config/boot"
 require "rails/commands"

bin/rake

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
 require_relative "../config/boot"
 require "rake"
 Rake.application.run

bin/setup

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
 require "pathname"
 require "fileutils"
 include FileUtils

bin/update

@@ -1,4 +1,6 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
 require "pathname"
 require "fileutils"
 include FileUtils

config.ru

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This file is used by Rack-based servers to start the application.
 
 require_relative "config/environment"

config/application.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require_relative "boot"
 
 require "rails"
@@ -30,7 +32,7 @@ module Postal
     config.eager_load_paths << Rails.root.join("lib")
 
     # Disable field_with_errors
-    config.action_view.field_error_proc = proc { |t, i| t }
+    config.action_view.field_error_proc = proc { |t, _| t }
 
     # Load the tracking server middleware
     require "postal/tracking_middleware"

config/boot.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
 $stdout.sync = true

config/cron.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Clockwork
 
   configure do |config|

config/environment.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Load the Rails application.
 require_relative "application"
 

config/environments/development.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 

config/environments/production.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
@@ -71,7 +73,7 @@ Rails.application.configure do
   # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
 
   if ENV["RAILS_LOG_TO_STDOUT"].present?
-    logger           = ActiveSupport::Logger.new(STDOUT)
+    logger           = ActiveSupport::Logger.new($stdout)
     logger.formatter = config.log_formatter
     config.logger = ActiveSupport::TaggedLogging.new(logger)
   end

config/environments/test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 

config/initializers/application_controller_renderer.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # ApplicationController.renderer.defaults.merge!(

config/initializers/assets.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Version of your assets, change this if you want to expire all your assets.

config/initializers/backtrace_silencers.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.

config/initializers/cookies_serializer.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Specify a serializer for the signed and encrypted cookie jars.

config/initializers/filter_parameter_logging.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Configure sensitive parameters which will be filtered from the log file.

config/initializers/inflections.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections
@@ -12,7 +14,6 @@
 
 # These inflection rules are supported but not enabled by default:
 ActiveSupport::Inflector.inflections(:en) do |inflect|
-
   inflect.acronym "DKIM"
   inflect.acronym "HTTP"
   inflect.acronym "SMTP"

config/initializers/mail_extensions.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "mail"
 module Mail
 
@@ -20,7 +22,7 @@ module Mail
 
     ## Extract plain text body of message
     def plain_body
-      if multipart? and text_part
+      if multipart? && text_part
         text_part.decoded
       elsif mime_type == "text/plain" || mime_type.nil?
         decoded
@@ -29,7 +31,7 @@ module Mail
 
     ## Extract HTML text body of message
     def html_body
-      if multipart? and html_part
+      if multipart? && html_part
         html_part.decoded
       elsif mime_type == "text/html"
         decoded
@@ -109,14 +111,16 @@ module Mail
   # Handle attached emails as attachments
   class AttachmentsList < Array
 
+    # rubocop:disable Lint/MissingSuper
     def initialize(parts_list)
       @parts_list = parts_list
       @content_disposition_type = "attachment"
-      parts_list.map do |p|
-        (p.parts.empty? and p.attachment?) ? p : p.attachments
-      end.flatten.compact.each { |a| self << a }
-      self
+      parts = parts_list.map do |p|
+        p.parts.empty? && p.attachment? ? p : p.attachments
+      end.flatten.compact
+      parts.each { |a| self << a }
     end
+    # rubocop:enable Lint/MissingSuper
 
   end
 

config/initializers/mime_types.rb

@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 # Be sure to restart your server when you modify this file.
 
 # Add new mime types for use in respond_to blocks:

config/initializers/new_framework_defaults.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 #
 # This file contains migration options to ease your Rails 5.0 upgrade.

config/initializers/postal.rb

@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "postal"

config/initializers/record_key_for_dom.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ActionView
   module RecordIdentifier