FEATURE: Show similar users when penalizing a user (#19334)

* FEATURE: Show similar users when penalizing a user

Moderators will be notified if other users with the same IP address
exist before penalizing a user.

* FEATURE: Allow staff to penalize multiple users

This allows staff members to suspend or silence multiple users belonging
to the same person.

spec/requests/admin/users_controller_spec.rb

@@ -103,6 +103,18 @@ RSpec.describe Admin::UsersController do
         expect(response.status).to eq(200)
         expect(response.parsed_body["id"]).to eq(user.id)
       end
+
+      it 'returns similar users' do
+        Fabricate(:user, ip_address: '88.88.88.88')
+        similar_user = Fabricate(:user, ip_address: user.ip_address)
+
+        get "/admin/users/#{user.id}.json"
+
+        expect(response.status).to eq(200)
+        expect(response.parsed_body["id"]).to eq(user.id)
+        expect(response.parsed_body["similar_users_count"]).to eq(1)
+        expect(response.parsed_body["similar_users"].map { |u| u["id"] }).to contain_exactly(similar_user.id)
+      end
     end
 
     context "when logged in as a non-staff user" do
@@ -229,6 +241,7 @@ RSpec.describe Admin::UsersController do
 
   describe '#suspend' do
     fab!(:created_post) { Fabricate(:post) }
+    fab!(:other_user) { Fabricate(:user) }
     let(:suspend_params) do
       { suspend_until: 5.hours.from_now,
         reason: "because of this post",
@@ -421,6 +434,18 @@ RSpec.describe Admin::UsersController do
         }, headers: { HTTP_API_KEY: api_key.key }
         expect(response.status).to eq(403)
       end
+
+      it "can silence multiple users" do
+        put "/admin/users/#{user.id}/suspend.json", params: {
+          suspend_until: 10.days.from_now,
+          reason: "short reason",
+          message: "long reason",
+          other_user_ids: [other_user.id],
+        }
+        expect(response.status).to eq(200)
+        expect(user.reload).to be_suspended
+        expect(other_user.reload).to be_suspended
+      end
     end
 
     context "when logged in as a moderator" do
@@ -1386,6 +1411,7 @@ RSpec.describe Admin::UsersController do
 
   describe '#silence' do
     fab!(:reg_user) { Fabricate(:user) }
+    fab!(:other_user) { Fabricate(:user) }
 
     context "when logged in as an admin" do
       before { sign_in(admin) }
@@ -1471,6 +1497,13 @@ RSpec.describe Admin::UsersController do
           )
         )
       end
+
+      it "can silence multiple users" do
+        put "/admin/users/#{reg_user.id}/silence.json", params: { other_user_ids: [other_user.id] }
+        expect(response.status).to eq(200)
+        expect(reg_user.reload).to be_silenced
+        expect(other_user.reload).to be_silenced
+      end
     end
 
     context "when logged in as a moderator" do