FEATURE: apply plugin modifier for answers controller rate limiting (#369)

Author: zhanfengzeng

app/controllers/discourse_solved/answer_controller.rb

@@ -35,6 +35,13 @@ def unaccept
 
   def limit_accepts
     return if current_user.staff?
+    run_rate_limiter =
+      DiscoursePluginRegistry.apply_modifier(
+        :solved_answers_controller_run_rate_limiter,
+        true,
+        current_user,
+      )
+    return if !run_rate_limiter
     RateLimiter.new(nil, "accept-hr-#{current_user.id}", 20, 1.hour).performed!
     RateLimiter.new(nil, "accept-min-#{current_user.id}", 4, 30.seconds).performed!
   end

spec/requests/answer_controller_spec.rb

@@ -0,0 +1,88 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe DiscourseSolved::AnswerController do
+  fab!(:user)
+  fab!(:staff_user) { Fabricate(:admin) }
+  fab!(:category)
+  fab!(:topic) { Fabricate(:topic, category: category) }
+  fab!(:p) { Fabricate(:post, topic: topic) }
+  fab!(:solution_post) { Fabricate(:post, topic: topic) }
+
+  before do
+    SiteSetting.solved_enabled = true
+    SiteSetting.allow_solved_on_all_topics = true
+    category.custom_fields[DiscourseSolved::ENABLE_ACCEPTED_ANSWERS_CUSTOM_FIELD] = "true"
+    category.save_custom_fields
+
+    # Give permission to accept solutions
+    user.update!(trust_level: 1)
+
+    # Make user the topic creator so they can accept answers
+    topic.update!(user_id: user.id)
+  end
+
+  describe "#accept" do
+    context "with default rate limiting" do
+      it "applies rate limits to regular users" do
+        sign_in(user)
+
+        # Should be rate limited
+        RateLimiter.any_instance.expects(:performed!).raises(RateLimiter::LimitExceeded.new(60))
+        post "/solution/accept.json", params: { id: solution_post.id }
+        expect(response.status).to eq(429)
+      end
+
+      it "does not apply rate limits to staff" do
+        sign_in(staff_user)
+
+        post "/solution/accept.json", params: { id: solution_post.id }
+        expect(response.status).to eq(200)
+      end
+    end
+
+    context "with plugin modifier" do
+      it "allows plugins to bypass rate limiting" do
+        sign_in(user)
+        # Create a plugin instance and register a modifier
+        plugin_instance = Plugin::Instance.new
+        modifier_block = Proc.new { |_, _| false }
+        plugin_instance.register_modifier(
+          :solved_answers_controller_run_rate_limiter,
+          &modifier_block
+        )
+
+        post "/solution/accept.json", params: { id: solution_post.id }
+        expect(response.status).to eq(200)
+        post "/solution/accept.json", params: { id: solution_post.id }
+        expect(response.status).to eq(200)
+
+        # Unregister the modifier using DiscoursePluginRegistry
+        DiscoursePluginRegistry.unregister_modifier(
+          plugin_instance,
+          :solved_answers_controller_run_rate_limiter,
+          &modifier_block
+        )
+      end
+    end
+  end
+  describe "#unaccept" do
+    before do
+      # Setup an accepted solution
+      sign_in(user)
+      post "/solution/accept.json", params: { id: solution_post.id }
+      expect(response.status).to eq(200)
+      sign_out
+    end
+
+    it "applies rate limits to regular users" do
+      sign_in(user)
+
+      # Should be rate limited
+      RateLimiter.any_instance.expects(:performed!).raises(RateLimiter::LimitExceeded.new(60))
+      post "/solution/unaccept.json", params: { id: solution_post.id }
+      expect(response.status).to eq(429)
+    end
+  end
+end