Switch to Rails 7

This drops the redirect_back_or_to method that Rails now natively
implements.

It also configures Foreman to raise errors on open redirects, similar to
what was implemented in 2517ba4. Rails
7.0 introduced this as a config option, but only enables it if you load
the 7.0 defaults while after this change it still loads the 6.1
defaults.

Gemfile

@@ -3,7 +3,7 @@ FOREMAN_GEMFILE = __FILE__ unless defined? FOREMAN_GEMFILE
 
 source 'https://rubygems.org'
 
-gem 'rails', '~> 6.1.6'
+gem 'rails', '~> 7.0.3'
 gem 'rest-client', '>= 2.0.0', '< 3', :require => 'rest_client'
 gem 'audited', '~> 5.0', '!= 5.1.0'
 gem 'will_paginate', '~> 3.3'

app/controllers/application_controller.rb

@@ -334,10 +334,6 @@ def process_ajax_error(exception, action = nil)
     render :partial => "common/ajax_error", :status => :internal_server_error, :locals => { :message => message }
   end
 
-  def redirect_back_or_to(url)
-    redirect_back(fallback_location: url, allow_other_host: false)
-  end
-
   def saved_redirect_url_or(default)
     session["redirect_to_url_#{controller_name}"] || default
   end

config/application.rb

@@ -99,8 +99,8 @@ class Application < Rails::Application
     config.active_support.use_authenticated_message_encryption = false
     config.action_dispatch.use_authenticated_cookie_encryption = false
 
-    # Rails 6.0 changed this to :zeitwerk
-    config.autoloader = :zeitwerk
+    # Match Rails 7.0 default
+    config.action_controller.raise_on_open_redirects = true
 
     # Rails 6.1 changed this to true, but apparently our codebase is not ready for bidirectional associations
     config.active_record.has_many_inversing = false

test/unit/foreman/renderer/renderers_shared_tests.rb

@@ -217,8 +217,8 @@ module RenderersSharedTests
       subject { renderer.render(source, @scope) }
 
       let(:source) { OpenStruct.new(content: '<%= foreman_server_ca_cert %>') }
-      let(:cert_path) { Rails.root.join('test/static_fixtures/certificates/example.com.crt') }
-      let(:cert_2_path) { Rails.root.join('test/static_fixtures/certificates/example2.com.crt') }
+      let(:cert_path) { Rails.root.join('test/static_fixtures/certificates/example.com.crt').to_s }
+      let(:cert_2_path) { Rails.root.join('test/static_fixtures/certificates/example2.com.crt').to_s }
       let(:cert_file_content) { File.read(cert_path) }
       let(:cert_2_file_content) { File.read(cert_2_path) }