v0.2 of the code and initial README.md

README.md

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+A plugin to authenticate users with MD5 passwords from legacy systems
+

plugin.rb

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+# plugins/md5_authentication/plugin.rb
+
+# frozen_string_literal: true
+
+# name: md5_authentication
+# about: A plugin to authenticate users with MD5 passwords from legacy systems
+# version: 0.2
+# authors: saint
+# url: https://gitea.federated.computer/saint/discourse-md5_authentication.git
+
+# plugins/md5_authentication/plugin.rb
+
+after_initialize do
+  Rails.logger.info("MD5 Authentication Plugin: Initialized")
+  class ::User
+    module LegacyMd5Authentication
+      def self.included(base)
+        base.singleton_class.prepend(ClassMethods)
+      end
+
+      module ClassMethods
+        def authenticate(login, password)
+          Rails.logger.info("LegacyMd5Authentication: Trying to authenticate user with login #{login}")
+
+          user = nil
+          
+          if login.include?('@')
+            # Assume it's an email address
+            user_email = UserEmail.find_by(email: login.downcase.strip)
+            user = user_email ? User.find(user_email.user_id) : nil
+          else
+            # Assume it's a username
+            user = User.find_by(username: login.downcase.strip)
+          end
+
+          if user
+            Rails.logger.info("LegacyMd5Authentication: User found: #{user.username}")
+            if user.custom_fields['md5_password'] && user.custom_fields['md5_password'] == Digest::MD5.hexdigest(password)
+              Rails.logger.info("LegacyMd5Authentication: MD5 password match for user: #{user.username}")
+              user.update!(password: password)
+              user.custom_fields['md5_password'] = nil
+              user.save_custom_fields
+              return user
+            else
+              Rails.logger.info("LegacyMd5Authentication: MD5 password did not match for user: #{user.username}")
+            end
+          else
+            Rails.logger.info("LegacyMd5Authentication: No user found with login #{login}")
+          end
+
+          super(login, password)
+        end
+      end
+    end
+
+    include LegacyMd5Authentication
+  end
+end
+