FEATURE: Non-staff users can use shared drafts. (#11329)

You can let non-staff users use shared drafts by modifying the `shared_drafts_min_trust_level` site setting. These users must have access to the shared draft category.

spec/components/guardian/topic_guardian_spec.rb

@@ -0,0 +1,86 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe TopicGuardian do
+  fab!(:admin) { Fabricate(:admin) }
+  fab!(:tl3_user) { Fabricate(:leader) }
+  fab!(:moderator) { Fabricate(:moderator) }
+  fab!(:category) { Fabricate(:category) }
+
+  describe '#can_create_shared_draft?' do
+    it 'when shared_drafts are disabled' do
+      SiteSetting.shared_drafts_min_trust_level = 'admin'
+
+      expect(Guardian.new(admin).can_create_shared_draft?).to eq(false)
+    end
+
+    it 'when user is a moderator and access is set to admin' do
+      SiteSetting.shared_drafts_category = category.id
+      SiteSetting.shared_drafts_min_trust_level = 'admin'
+
+      expect(Guardian.new(moderator).can_create_shared_draft?).to eq(false)
+    end
+
+    it 'when user is a moderator and access is set to staff' do
+      SiteSetting.shared_drafts_category = category.id
+      SiteSetting.shared_drafts_min_trust_level = 'staff'
+
+      expect(Guardian.new(moderator).can_create_shared_draft?).to eq(true)
+    end
+
+    it 'when user is TL3 and access is set to TL2' do
+      SiteSetting.shared_drafts_category = category.id
+      SiteSetting.shared_drafts_min_trust_level = '2'
+
+      expect(Guardian.new(tl3_user).can_create_shared_draft?).to eq(true)
+    end
+  end
+
+  describe '#can_edit_topic?' do
+    context 'when the topic is a shared draft' do
+      let(:tl2_user) { Fabricate(:user, trust_level: TrustLevel[2])  }
+
+      before do
+        SiteSetting.shared_drafts_category = category.id
+        SiteSetting.shared_drafts_min_trust_level = '2'
+      end
+
+      it 'returns false if the topic is a PM' do
+        pm_with_draft = Fabricate(:private_message_topic, category: category)
+        Fabricate(:shared_draft, topic: pm_with_draft)
+
+        expect(Guardian.new(tl2_user).can_edit_topic?(pm_with_draft)).to eq(false)
+      end
+
+      it 'returns false if the topic is archived' do
+        archived_topic = Fabricate(:topic, archived: true, category: category)
+        Fabricate(:shared_draft, topic: archived_topic)
+
+        expect(Guardian.new(tl2_user).can_edit_topic?(archived_topic)).to eq(false)
+      end
+
+      it 'returns true if a shared draft exists' do
+        topic = Fabricate(:topic, category: category)
+        Fabricate(:shared_draft, topic: topic)
+
+        expect(Guardian.new(tl2_user).can_edit_topic?(topic)).to eq(true)
+      end
+
+      it 'returns false if the user has a lower trust level' do
+        tl1_user = Fabricate(:user, trust_level: TrustLevel[1])
+        topic = Fabricate(:topic, category: category)
+        Fabricate(:shared_draft, topic: topic)
+
+        expect(Guardian.new(tl1_user).can_edit_topic?(topic)).to eq(false)
+      end
+
+      it 'returns true if the shared_draft is from a different category' do
+        topic = Fabricate(:topic, category: Fabricate(:category))
+        Fabricate(:shared_draft, topic: topic)
+
+        expect(Guardian.new(tl2_user).can_edit_topic?(topic)).to eq(false)
+      end
+    end
+  end
+end

spec/components/guardian/user_guardian_spec.rb

@@ -456,4 +456,31 @@ describe UserGuardian do
     end
   end
 
+  describe '#can_edit_post?' do
+    fab!(:category) { Fabricate(:category) }
+
+    let(:topic) { Fabricate(:topic, category: category) }
+    let(:post_with_draft) { Fabricate(:post, topic: topic) }
+
+    before do
+      SiteSetting.shared_drafts_category = category.id
+      SiteSetting.shared_drafts_min_trust_level = '2'
+      Fabricate(:shared_draft, topic: topic)
+    end
+
+    it 'returns true if a shared draft exists' do
+      expect(Guardian.new(trust_level_2).can_edit_post?(post_with_draft)).to eq(true)
+    end
+
+    it 'returns false if the user has a lower trust level' do
+      expect(Guardian.new(trust_level_1).can_edit_post?(post_with_draft)).to eq(false)
+    end
+
+    it 'returns false if the draft is from a different category' do
+      topic.update!(category: Fabricate(:category))
+
+      expect(Guardian.new(trust_level_2).can_edit_post?(post_with_draft)).to eq(false)
+    end
+
+  end
 end