v0.2 Brand new plugin

README.md

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+A custom Federated Computer plugin to redirect legacy Gossamer Forums URLs
+

plugin.rb

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+# plugins/discourse-legacy_links/plugin.rb
+
+# frozen_string_literal: true
+
+# name: discourse-legacy_links
+# about: A plugin to handle legacy Gossamer Forums URLs
+# version: 0.2
+# authors: saint@federated.computer
+# url: https://gitea.federated.computer/saint/discourse-legacy_links.git
+
+# require 'digest'
+
+# enabled_site_setting :discourse_legacy_routing_enabled
+
+# after_initialize do
+after_initialize do
+  module ::DiscourseCustomRouting
+    class Engine < ::Rails::Engine
+      engine_name "discourse_custom_routing"
+      isolate_namespace DiscourseCustomRouting
+    end
+
+    # Define the custom controller
+    class CustomPostController < ::ApplicationController
+      # Match URLs that include a post_id at the end or query parameter
+      def index
+        post_id = extract_post_id_from_request
+
+        if post_id
+          post = find_post_by_custom_field(post_id)
+          
+          if post
+            # Redirect to the post URL if found
+            redirect_to post_url(post)
+          else
+            # Return 404 if the post is not found
+            render plain: 'Post not found', status: 404
+          end
+        else
+          # Handle cases where the post_id cannot be extracted
+          render plain: 'Invalid URL', status: 400
+        end
+      end
+
+      private
+
+      def extract_post_id_from_request
+        # Extract post_id from various URL formats
+        if params[:post_id]
+          params[:post_id].to_i
+        elsif request.path.match(%r{/forum/[^/]+/P(\d+)/})
+          $1.to_i
+        elsif request.query_string.match(/post=(\d+)/)
+          $1.to_i
+        elsif request.query_string.match(/parent_post_id=(\d+)/)
+          $1.to_i
+        else
+          nil
+        end
+      end
+
+      def find_post_by_custom_field(post_id)
+        # Find the post with the specified custom field
+        Post.joins(:topic_custom_fields)
+            .where(topic_custom_fields: { name: 'original_gossamer_id', value: post_id.to_s })
+            .first
+      end
+    end
+
+    # Register custom routes
+    Discourse::Application.routes.append do
+      get '/forum/*path' => 'custom_post#index'
+    end
+  end
+end