FEATURE: Flarum import script (#13139)

script/import_scripts/flarum_import.rb

@@ -0,0 +1,162 @@
+# frozen_string_literal: true
+
+require "mysql2"
+require 'time'
+require 'date'
+
+require File.expand_path(File.dirname(__FILE__) + "/base.rb")
+
+class ImportScripts::FLARUM < ImportScripts::Base
+  #SET THE APPROPRIATE VALUES FOR YOUR MYSQL CONNECTION
+  FLARUM_HOST ||= ENV['FLARUM_HOST'] || "db_host"
+  FLARUM_DB ||= ENV['FLARUM_DB'] || "db_name"
+  BATCH_SIZE ||= 1000
+  FLARUM_USER ||= ENV['FLARUM_USER'] || "db_user"
+  FLARUM_PW ||= ENV['FLARUM_PW'] || "db_user_pass"
+
+  def initialize
+    super
+
+    @client = Mysql2::Client.new(
+      host: FLARUM_HOST,
+      username: FLARUM_USER,
+      password: FLARUM_PW,
+      database: FLARUM_DB
+    )
+  end
+
+  def execute
+
+    import_users
+    import_categories
+    import_posts
+
+  end
+
+  def import_users
+    puts '', "creating users"
+    total_count = mysql_query("SELECT count(*) count FROM users;").first['count']
+
+    batches(BATCH_SIZE) do |offset|
+      results = mysql_query(
+        "SELECT id, username, email, join_time created_at,last_seen_time last_visit_time, password
+         FROM users
+         LIMIT #{BATCH_SIZE}
+         OFFSET #{offset};")
+
+      break if results.size < 1
+
+      next if all_records_exist? :users, results.map { |u| u["id"].to_i }
+
+      create_users(results, total: total_count, offset: offset) do |user|
+        { id: user['id'],
+          email: user['email'],
+          username: user['username'],
+          name: user['username'],
+          created_at: user['created_at'],
+          last_seen_at: user['last_visit_time'],
+          password: user['password'] }
+      end
+    end
+  end
+
+  def import_categories
+    puts "", "importing top level categories..."
+
+    categories = mysql_query("
+                              SELECT id, name, description, position
+                              FROM tags
+                              ORDER BY position ASC
+                            ").to_a
+
+    create_categories(categories) do |category|
+      {
+        id: category["id"],
+        name: category["name"]
+      }
+    end
+
+    puts "", "importing children categories..."
+
+    children_categories = mysql_query("
+                                       SELECT id, name, description, position
+                                       FROM tags
+                                       ORDER BY position
+                                      ").to_a
+
+    create_categories(children_categories) do |category|
+      {
+        id: "child##{category['id']}",
+        name: category["name"],
+        description: category["description"],
+      }
+    end
+  end
+
+  def import_posts
+    puts "", "creating topics and posts"
+
+    total_count = mysql_query("SELECT count(*) count from posts").first["count"]
+
+    batches(BATCH_SIZE) do |offset|
+      results = mysql_query("
+        SELECT p.id id,
+               d.id topic_id,
+               d.title title,
+               d.first_post_id first_post_id,
+               p.user_id user_id,
+               p.content raw,
+               p.created_at created_at
+               t.tag_id category_id,
+        FROM posts p,
+             discussions d,
+             discussion_tag t,
+
+        WHERE p.discussion_id = d.id
+        ORDER BY p.created_at
+        LIMIT #{BATCH_SIZE}
+        OFFSET #{offset};
+      ").to_a
+
+      break if results.size < 1
+      next if all_records_exist? :posts, results.map { |m| m['id'].to_i }
+
+      create_posts(results, total: total_count, offset: offset) do |m|
+        skip = false
+        mapped = {}
+
+        mapped[:id] = m['id']
+        mapped[:user_id] = user_id_from_imported_user_id(m['user_id']) || -1
+        mapped[:raw] = process_FLARUM_post(m['raw'], m['id'])
+        mapped[:created_at] = Time.zone.at(m['created_at'])
+
+        if m['id'] == m['first_post_id']
+          mapped[:category] = category_id_from_imported_category_id("child##{m['category_id']}")
+          mapped[:title] = CGI.unescapeHTML(m['title'])
+        else
+          parent = topic_lookup_from_imported_post_id(m['first_post_id'])
+          if parent
+            mapped[:topic_id] = parent[:topic_id]
+          else
+            puts "Parent post #{m['first_post_id']} doesn't exist. Skipping #{m["id"]}: #{m["title"][0..40]}"
+            skip = true
+          end
+        end
+
+        skip ? nil : mapped
+      end
+    end
+  end
+
+  def process_FLARUM_post(raw, import_id)
+    s = raw.dup
+
+    s
+  end
+
+  def mysql_query(sql)
+    @client.query(sql, cache_rows: false)
+  end
+end
+
+ImportScripts::FLARUM.new.perform