Improvements to phpBB3 import script (#10999)

* FEATURE: Import attachments

* FEATURE: Add support for importing multiple forums in one

* FEATURE: Add support for category and tag mapping

* FEATURE: Import groups

* FIX: Add spaces around images

* FEATURE: Custom mapping of user rank to trust levels

* FIX: Do not fail import if it cannot import polls

* FIX: Optimize existing records lookup

Co-authored-by: Gerhard Schlager <mail@gerhard-schlager.at>
Co-authored-by: Jarek Radosz <jradosz@gmail.com>

script/import_scripts/phpbb3/support/settings.rb

@@ -1,14 +1,23 @@
 # frozen_string_literal: true
 
+require 'csv'
 require 'yaml'
+require_relative '../../base'
 
 module ImportScripts::PhpBB3
   class Settings
     def self.load(filename)
       yaml = YAML::load_file(filename)
-      Settings.new(yaml)
+      Settings.new(yaml.deep_stringify_keys.with_indifferent_access)
     end
 
+    attr_reader :site_name
+
+    attr_reader :new_categories
+    attr_reader :category_mappings
+    attr_reader :tag_mappings
+    attr_reader :rank_mapping
+
     attr_reader :import_anonymous_users
     attr_reader :import_attachments
     attr_reader :import_private_messages
@@ -34,6 +43,14 @@ module ImportScripts::PhpBB3
 
     def initialize(yaml)
       import_settings = yaml['import']
+
+      @site_name = import_settings['site_name']
+
+      @new_categories = import_settings['new_categories']
+      @category_mappings = import_settings['category_mappings']
+      @tag_mappings = import_settings['tag_mappings']
+      @rank_mapping = import_settings['rank_mapping']
+
       @import_anonymous_users = import_settings['anonymous_users']
       @import_attachments = import_settings['attachments']
       @import_private_messages = import_settings['private_messages']
@@ -58,6 +75,20 @@ module ImportScripts::PhpBB3
 
       @database = DatabaseSettings.new(yaml['database'])
     end
+
+    def prefix(val)
+      @site_name.present? && val.present? ? "#{@site_name}:#{val}" : val
+    end
+
+    def trust_level_for_posts(rank, trust_level: 0)
+      if @rank_mapping.present?
+        @rank_mapping.each do |key, value|
+          trust_level = [trust_level, key.gsub('trust_level_', '').to_i].max if rank >= value
+        end
+      end
+
+      trust_level
+    end
   end
 
   class DatabaseSettings