discourse/spec/lib/post_revisor_spec.rb

# frozen_string_literal: true

require 'post_revisor'

RSpec.describe PostRevisor do
  fab!(:topic) { Fabricate(:topic) }
  fab!(:newuser) { Fabricate(:newuser, last_seen_at: Date.today) }
  fab!(:user) { Fabricate(:user) }
  fab!(:coding_horror) { Fabricate(:coding_horror) }
  fab!(:admin) { Fabricate(:admin) }
  fab!(:moderator) { Fabricate(:moderator) }
  let(:post_args) { { user: newuser, topic: topic } }

  describe 'TopicChanges' do
    let(:tc) {
      topic.reload
      PostRevisor::TopicChanges.new(topic, topic.user)
    }

    it 'provides a guardian' do
      expect(tc.guardian).to be_an_instance_of Guardian
    end

    it 'tracks changes properly' do
      expect(tc.diff).to eq({})

      # it remembers changes we tell it to
      tc.record_change('height', '180cm', '170cm')
      expect(tc.diff['height']).to eq(['180cm', '170cm'])

      # it works with arrays of values
      tc.record_change('colors', nil, ['red', 'blue'])
      expect(tc.diff['colors']).to eq([nil, ['red', 'blue']])

      # it does not record changes to the same val
      tc.record_change('wat', 'js', 'js')
      expect(tc.diff['wat']).to be_nil

      tc.record_change('tags', ['a', 'b'], ['a', 'b'])
      expect(tc.diff['tags']).to be_nil

    end
  end

  describe 'editing category' do
    it "triggers the :post_edited event with topic_changed?" do
      category = Fabricate(:category)
      category.set_permissions(everyone: :full)
      category.save!
      post = create_post
      events = DiscourseEvent.track_events do
        post.revise(post.user, category_id: category.id)
      end

      event = events.find { |e| e[:event_name] == :post_edited }

      expect(event[:params].first).to eq(post)
      expect(event[:params].second).to eq(true)
      expect(event[:params].third).to be_kind_of(PostRevisor)
      expect(event[:params].third.topic_diff).to eq({ "category_id" => [SiteSetting.uncategorized_category_id, category.id] })
    end

    it 'does not revise category when no permission to create a topic in category' do
      category = Fabricate(:category)
      category.set_permissions(staff: :full)
      category.save!

      post = create_post
      old_id = post.topic.category_id

      post.revise(post.user, category_id: category.id)

      post.reload
      expect(post.topic.category_id).to eq(old_id)

      category.set_permissions(everyone: :full)
      category.save!

      post.revise(post.user, category_id: category.id)

      post.reload
      expect(post.topic.category_id).to eq(category.id)
    end

    it 'does not revise category when the destination category requires topic approval' do
      new_category = Fabricate(:category)
      new_category.custom_fields[Category::REQUIRE_TOPIC_APPROVAL] = true
      new_category.save!

      post = create_post
      old_category_id = post.topic.category_id

      post.revise(post.user, category_id: new_category.id)
      expect(post.reload.topic.category_id).to eq(old_category_id)

      new_category.custom_fields[Category::REQUIRE_TOPIC_APPROVAL] = false
      new_category.save!

      post.revise(post.user, category_id: new_category.id)
      expect(post.reload.topic.category_id).to eq(new_category.id)
    end

    it 'does not revise category if incorrect amount of tags' do
      SiteSetting.min_trust_to_create_tag = 0
      SiteSetting.min_trust_level_to_tag_topics = 0

      new_category = Fabricate(:category, minimum_required_tags: 1)

      post = create_post
      old_category_id = post.topic.category_id

      post.revise(post.user, category_id: new_category.id)
      expect(post.reload.topic.category_id).to eq(old_category_id)

      tag = Fabricate(:tag)
      topic_tag = Fabricate(:topic_tag, topic: post.topic, tag: tag)
      post.revise(post.user, category_id: new_category.id)
      expect(post.reload.topic.category_id).to eq(new_category.id)
      topic_tag.destroy

      post.revise(post.user, category_id: new_category.id, tags: ['test_tag'])
      expect(post.reload.topic.category_id).to eq(new_category.id)
    end
  end

  describe 'editing tags' do
    fab!(:post) { Fabricate(:post) }

    subject { PostRevisor.new(post) }

    before do
      Jobs.run_immediately!

      TopicUser.change(
        newuser.id,
        post.topic_id,
        notification_level: TopicUser.notification_levels[:watching]
      )
    end

    it 'creates notifications' do
      expect { subject.revise!(admin, tags: ['new-tag']) }
        .to change { Notification.count }.by(1)
    end

    it 'skips notifications if disable_tags_edit_notifications' do
      SiteSetting.disable_tags_edit_notifications = true

      expect { subject.revise!(admin, tags: ['new-tag']) }
        .not_to change { Notification.count }
    end
  end

  describe 'revise wiki' do
    before do
      # There used to be a bug where wiki changes were considered posting "too similar"
      # so this is enabled and checked
      Discourse.redis.delete_prefixed('unique-post')
      SiteSetting.unique_posts_mins = 10
    end

    it 'allows the user to change it to a wiki' do
      pc = PostCreator.new(newuser, topic_id: topic.id, raw: 'this is a post that will become a wiki')
      post = pc.create
      expect(post.revise(post.user, wiki: true)).to be_truthy
      post.reload
      expect(post.wiki).to be_truthy
    end
  end

  describe 'revise' do
    let(:post) { Fabricate(:post, post_args) }
    let(:first_version_at) { post.last_version_at }

    subject { PostRevisor.new(post) }

    it 'destroys last revision if edit is undone' do
      old_raw = post.raw

      subject.revise!(admin, raw: 'new post body', tags: ['new-tag'])
      expect(post.topic.reload.tags.map(&:name)).to contain_exactly('new-tag')
      expect(post.post_revisions.reload.size).to eq(1)

      subject.revise!(admin, raw: old_raw, tags: [])
      expect(post.topic.reload.tags.map(&:name)).to be_empty
      expect(post.post_revisions.reload.size).to eq(0)

      subject.revise!(admin, raw: 'next post body', tags: ['new-tag'])
      expect(post.topic.reload.tags.map(&:name)).to contain_exactly('new-tag')
      expect(post.post_revisions.reload.size).to eq(1)
    end

    describe 'with the same body' do
      it "doesn't change version" do
        expect {
          expect(subject.revise!(post.user, raw: post.raw)).to eq(false)
          post.reload
        }.not_to change(post, :version)
      end
    end

    describe 'with nil raw contents' do
      it "doesn't change version" do
        expect {
          expect(subject.revise!(post.user, raw: nil)).to eq(false)
          post.reload
        }.not_to change(post, :version)
      end
    end

    describe 'topic is in slow mode' do
      before do
        topic.update!(slow_mode_seconds: 1000)
      end

      it 'regular edits are not allowed by default' do
        subject.revise!(
          post.user,
          { raw: 'updated body' },
          revised_at: post.updated_at + 1000.minutes
        )

        post.reload
        expect(post.errors.present?).to eq(true)
        expect(post.errors.messages[:base].first).to be I18n.t("cannot_edit_on_slow_mode")
      end

      it 'grace period editing is allowed' do
        SiteSetting.editing_grace_period = 1.minute

        subject.revise!(
          post.user,
          { raw: 'updated body' },
          revised_at: post.updated_at + 10.seconds
        )

        post.reload
        expect(post.errors).to be_empty
      end

      it 'regular edits are allowed if it was turned on in settings' do
        SiteSetting.slow_mode_prevents_editing = false

        subject.revise!(
          post.user,
          { raw: 'updated body' },
          revised_at: post.updated_at + 10.minutes
        )

        post.reload
        expect(post.errors).to be_empty
      end

      it 'staff is allowed to edit posts even if the topic is in slow mode' do
        admin = Fabricate(:admin)
        subject.revise!(
          admin,
          { raw: 'updated body' },
          revised_at: post.updated_at + 10.minutes
        )

        post.reload
        expect(post.errors).to be_empty
      end
    end

    describe 'grace period editing' do
      it 'correctly applies edits' do
        SiteSetting.editing_grace_period = 1.minute

        subject.revise!(post.user, { raw: 'updated body' }, revised_at: post.updated_at + 10.seconds)
        post.reload

        expect(post.version).to eq(1)
        expect(post.public_version).to eq(1)
        expect(post.revisions.size).to eq(0)
        expect(post.last_version_at).to eq_time(first_version_at)
        expect(subject.category_changed).to be_blank
      end

      it "does create a new version if a large diff happens" do
        SiteSetting.editing_grace_period_max_diff = 10

        post = Fabricate(:post, raw: 'hello world')
        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world123456789' }, revised_at: post.updated_at + 1.second)

        post.reload

        expect(post.version).to eq(1)

        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world12345678901' }, revised_at: post.updated_at + 1.second)

        post.reload
        expect(post.version).to eq(2)

        expect(post.revisions.first.modifications["raw"][0]).to eq("hello world")
        expect(post.revisions.first.modifications["cooked"][0]).to eq("<p>hello world</p>")

        SiteSetting.editing_grace_period_max_diff_high_trust = 100

        post.user.update_columns(trust_level: 2)

        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world12345678901 123456789012' }, revised_at: post.updated_at + 1.second)

        post.reload
        expect(post.version).to eq(2)
        expect(post.revisions.count).to eq(1)

      end

      it "doesn't create a new version" do
        SiteSetting.editing_grace_period = 1.minute
        SiteSetting.editing_grace_period_max_diff = 100

        # making a revision
        subject.revise!(post.user, { raw: 'updated body' }, revised_at: post.updated_at + SiteSetting.editing_grace_period + 1.seconds)
        # "roll back"
        subject.revise!(post.user, { raw: 'Hello world' }, revised_at: post.updated_at + SiteSetting.editing_grace_period + 2.seconds)

        post.reload

        expect(post.version).to eq(1)
        expect(post.public_version).to eq(1)
        expect(post.revisions.size).to eq(0)
      end

      it "should bump the topic" do
        expect {
          subject.revise!(post.user, { raw: 'updated body' }, revised_at: post.updated_at + SiteSetting.editing_grace_period + 1.seconds)
        }.to change { post.topic.bumped_at }
      end

      it "should send muted and latest message" do
        TopicUser.create!(topic: post.topic, user: post.user, notification_level: 0)
        messages = MessageBus.track_publish("/latest") do
          subject.revise!(post.user, { raw: 'updated body' }, revised_at: post.updated_at + SiteSetting.editing_grace_period + 1.seconds)
        end

        muted_message = messages.find { |message| message.data["message_type"] == "muted" }
        latest_message = messages.find { |message| message.data["message_type"] == "latest" }

        expect(muted_message.data["topic_id"]).to eq(topic.id)
        expect(latest_message.data["topic_id"]).to eq(topic.id)
      end
    end

    describe 'edit reasons' do
      it "does create a new version if an edit reason is provided" do
        post = Fabricate(:post, raw: 'hello world')
        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world123456789', edit_reason: 'this is my reason' }, revised_at: post.updated_at + 1.second)
        post.reload
        expect(post.version).to eq(2)
        expect(post.revisions.count).to eq(1)
      end

      it "resets the edit_reason attribute in post model" do
        freeze_time
        SiteSetting.editing_grace_period = 5.seconds
        post = Fabricate(:post, raw: 'hello world')
        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world123456789', edit_reason: 'this is my reason' }, revised_at: post.updated_at + 1.second)
        post.reload
        expect(post.edit_reason).to eq('this is my reason')

        revisor.revise!(post.user, { raw: 'hello world4321' }, revised_at: post.updated_at + 7.seconds)
        post.reload
        expect(post.edit_reason).not_to be_present
      end

      it "does not create a new version if an edit reason is provided and its the same as the current edit reason" do
        post = Fabricate(:post, raw: 'hello world', edit_reason: 'this is my reason')
        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world123456789', edit_reason: 'this is my reason' }, revised_at: post.updated_at + 1.second)
        post.reload
        expect(post.version).to eq(1)
        expect(post.revisions.count).to eq(0)
      end

      it "does not clobber the existing edit reason for a revision if it is not provided in a subsequent revision" do
        post = Fabricate(:post, raw: 'hello world')
        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world123456789', edit_reason: 'this is my reason' }, revised_at: post.updated_at + 1.second)
        post.reload
        revisor.revise!(post.user, { raw: 'hello some other thing' }, revised_at: post.updated_at + 1.second)
        expect(post.revisions.first.modifications[:edit_reason]).to eq([nil, 'this is my reason'])
      end
    end

    describe 'hidden post' do
      it "correctly stores the modification value" do
        post.update(hidden: true, hidden_reason_id: Post.hidden_reasons[:flag_threshold_reached])
        revisor = PostRevisor.new(post)
        revisor.revise!(post.user, { raw: 'hello world' }, revised_at: post.updated_at + 11.minutes)
        expect(post.revisions.first.modifications.symbolize_keys).to eq(
          cooked: ["<p>Hello world</p>", "<p>hello world</p>"],
          raw: ["Hello world", "hello world"]
        )
      end
    end

    describe 'revision much later' do

      let!(:revised_at) { post.updated_at + 2.minutes }

      before do
        SiteSetting.editing_grace_period = 1.minute
        subject.revise!(post.user, { raw: 'updated body' }, revised_at: revised_at)
        post.reload
      end

      it "doesn't update a category" do
        expect(subject.category_changed).to be_blank
      end

      it 'updates the versions' do
        expect(post.version).to eq(2)
        expect(post.public_version).to eq(2)
      end

      it 'creates a new revision' do
        expect(post.revisions.size).to eq(1)
      end

      it "updates the last_version_at" do
        expect(post.last_version_at.to_i).to eq(revised_at.to_i)
      end

      describe "new edit window" do

        before do
          subject.revise!(post.user, { raw: 'yet another updated body' }, revised_at: revised_at)
          post.reload
        end

        it "doesn't create a new version if you do another" do
          expect(post.version).to eq(2)
          expect(post.public_version).to eq(2)
        end

        it "doesn't change last_version_at" do
          expect(post.last_version_at.to_i).to eq(revised_at.to_i)
        end

        it "doesn't update a category" do
          expect(subject.category_changed).to be_blank
        end

        context "after second window" do

          let!(:new_revised_at) { revised_at + 2.minutes }

          before do
            subject.revise!(post.user, { raw: 'yet another, another updated body' }, revised_at: new_revised_at)
            post.reload
          end

          it "does create a new version after the edit window" do
            expect(post.version).to eq(3)
            expect(post.public_version).to eq(3)
          end

          it "does create a new version after the edit window" do
            expect(post.last_version_at.to_i).to eq(new_revised_at.to_i)
          end
        end
      end
    end

    describe 'category topic' do
      let!(:category) do
        category = Fabricate(:category)
        category.update_column(:topic_id, topic.id)
        category
      end

      let(:new_description) { "this is my new description." }

      it "should have no description by default" do
        expect(category.description).to be_blank
      end

      context "with one paragraph description" do
        before do
          subject.revise!(post.user, raw: new_description)
          category.reload
        end

        it "returns the changed category info" do
          expect(subject.category_changed).to eq(category)
        end

        it "updates the description of the category" do
          expect(category.description).to eq(new_description)
        end
      end

      context "with multiple paragraph description" do
        before do
          subject.revise!(post.user, raw: "#{new_description}\n\nOther content goes here.")
          category.reload
        end

        it "returns the changed category info" do
          expect(subject.category_changed).to eq(category)
        end

        it "updates the description of the category" do
          expect(category.description).to eq(new_description)
        end
      end

      context "with invalid description without paragraphs" do
        before do
          subject.revise!(post.user, raw: "# This is a title")
          category.reload
        end

        it "returns a error for the user" do
          expect(post.errors.present?).to eq(true)
          expect(post.errors.messages[:base].first).to be I18n.t("category.errors.description_incomplete")
        end

        it "doesn't update the description of the category" do
          expect(category.description).to eq(nil)
        end
      end

      context 'when updating back to the original paragraph' do
        before do
          category.update_column(:description, 'this is my description')
          subject.revise!(post.user, raw: Category.post_template)
          category.reload
        end

        it "puts the description back to nothing" do
          expect(category.description).to be_blank
        end

        it "returns the changed category info" do
          expect(subject.category_changed).to eq(category)
        end
      end

    end

    describe 'rate limiter' do
      fab!(:changed_by) { coding_horror }

      before do
        RateLimiter.enable
        RateLimiter.clear_all!
        SiteSetting.editing_grace_period = 0
      end

      it "triggers a rate limiter" do
        EditRateLimiter.any_instance.expects(:performed!)
        subject.revise!(changed_by, raw: 'updated body')
      end

      it "raises error when a user gets rate limited" do
        SiteSetting.max_edits_per_day = 1
        user = Fabricate(:user, trust_level: 1)

        subject.revise!(user, raw: 'body (edited)')

        expect do
          subject.revise!(user, raw: 'body (edited twice) ')
        end.to raise_error(RateLimiter::LimitExceeded)
      end

      it "edit limits scale up depending on user's trust level" do
        SiteSetting.max_edits_per_day = 1
        SiteSetting.tl2_additional_edits_per_day_multiplier = 2
        SiteSetting.tl3_additional_edits_per_day_multiplier = 3
        SiteSetting.tl4_additional_edits_per_day_multiplier = 4

        user = Fabricate(:user, trust_level: 2)
        expect { subject.revise!(user, raw: 'body (edited)') }.to_not raise_error
        expect { subject.revise!(user, raw: 'body (edited twice)') }.to_not raise_error
        expect do
          subject.revise!(user, raw: 'body (edited three times) ')
        end.to raise_error(RateLimiter::LimitExceeded)

        user = Fabricate(:user, trust_level: 3)
        expect { subject.revise!(user, raw: 'body (edited)') }.to_not raise_error
        expect { subject.revise!(user, raw: 'body (edited twice)') }.to_not raise_error
        expect { subject.revise!(user, raw: 'body (edited three times)') }.to_not raise_error
        expect do
          subject.revise!(user, raw: 'body (edited four times) ')
        end.to raise_error(RateLimiter::LimitExceeded)

        user = Fabricate(:user, trust_level: 4)
        expect { subject.revise!(user, raw: 'body (edited)') }.to_not raise_error
        expect { subject.revise!(user, raw: 'body (edited twice)') }.to_not raise_error
        expect { subject.revise!(user, raw: 'body (edited three times)') }.to_not raise_error
        expect { subject.revise!(user, raw: 'body (edited four times)') }.to_not raise_error
        expect do
          subject.revise!(user, raw: 'body (edited five times) ')
        end.to raise_error(RateLimiter::LimitExceeded)
      end
    end

    describe "admin editing a new user's post" do
      fab!(:changed_by) { Fabricate(:admin) }

      before do
        SiteSetting.newuser_max_embedded_media = 0
        url = "http://i.imgur.com/wfn7rgU.jpg"
        Oneboxer.stubs(:onebox).with(url, anything).returns("<img src='#{url}'>")
        subject.revise!(changed_by, raw: "So, post them here!\n#{url}")
      end

      it "allows an admin to insert images into a new user's post" do
        expect(post.errors).to be_blank
      end

      it "marks the admin as the last updater" do
        expect(post.last_editor_id).to eq(changed_by.id)
      end

    end

    describe "new user editing their own post" do
      before do
        SiteSetting.newuser_max_embedded_media = 0
        url = "http://i.imgur.com/FGg7Vzu.gif"
        Oneboxer.stubs(:cached_onebox).with(url, anything).returns("<img src='#{url}'>")
        subject.revise!(post.user, raw: "So, post them here!\n#{url}")
      end

      it "doesn't allow images to be inserted" do
        expect(post.errors).to be_present
      end

    end

    describe 'with a new body' do
      before do
        SiteSetting.editing_grace_period_max_diff = 1000
      end

      fab!(:changed_by) { coding_horror }
      let!(:result) { subject.revise!(changed_by, raw: "lets update the body. Здравствуйте") }

      it 'correctly updates raw' do
        expect(result).to eq(true)
        expect(post.raw).to eq("lets update the body. Здравствуйте")
        expect(post.invalidate_oneboxes).to eq(true)
        expect(post.version).to eq(2)
        expect(post.public_version).to eq(2)
        expect(post.revisions.size).to eq(1)
        expect(post.revisions.first.user_id).to eq(changed_by.id)

        # updates word count
        expect(post.word_count).to eq(5)
        post.topic.reload
        expect(post.topic.word_count).to eq(5)
      end

      it 'increases the post_edits stat count' do
        expect do
          subject.revise!(post.user, { raw: "This is a new revision" })
        end.to change { post.user.user_stat.post_edits_count.to_i }.by(1)
      end

      context 'when second poster posts again quickly' do
        it 'is a grace period edit, because the second poster posted again quickly' do
          SiteSetting.editing_grace_period = 1.minute
          subject.revise!(changed_by, { raw: 'yet another updated body' }, revised_at: post.updated_at + 10.seconds)
          post.reload
          expect(post.version).to eq(2)
          expect(post.public_version).to eq(2)
          expect(post.revisions.size).to eq(1)
        end
      end

      context 'when passing skip_revision as true' do
        before do
          SiteSetting.editing_grace_period = 1.minute
          subject.revise!(changed_by, { raw: 'yet another updated body' }, revised_at: post.updated_at + 10.hours, skip_revision: true)
          post.reload
        end

        it 'does not create new revision ' do
          expect(post.version).to eq(2)
          expect(post.public_version).to eq(2)
          expect(post.revisions.size).to eq(1)
        end
      end

      context 'when editing the before_edit_post event signature' do
        it 'contains post and params' do
          params = { raw: 'body (edited)' }
          events = DiscourseEvent.track_events { subject.revise!(user, params) }
          expect(events).to include(
            event_name: :before_edit_post,
            params: [post, params]
          )
        end
      end
    end

    describe "topic excerpt" do
      it "topic excerpt is updated only if first post is revised" do
        revisor = PostRevisor.new(post)
        first_post = topic.first_post
        expect {
          revisor.revise!(first_post.user, { raw: 'Edit the first post' }, revised_at: first_post.updated_at + 10.seconds)
          topic.reload
        }.to change { topic.excerpt }
        second_post = Fabricate(:post, post_args.merge(post_number: 2, topic_id: topic.id))
        expect {
          PostRevisor.new(second_post).revise!(second_post.user, raw: 'Edit the 2nd post')
          topic.reload
        }.to_not change { topic.excerpt }
      end
    end

    describe "welcome topic" do
      before do
        SiteSetting.welcome_topic_id = topic.id
      end

      it "should publish welcome topic edit message" do
        revisor = PostRevisor.new(post)
        first_post = topic.first_post
        UserAuthToken.generate!(user_id: admin.id)
        Discourse.cache.write(Site.welcome_topic_banner_cache_key(admin.id), true)

        messages = MessageBus.track_publish("/site/welcome-topic-banner") do
          revisor.revise!(admin, { raw: 'updated welcome topic body' })
        end
        welcome_topic_banner_message = messages.find { |message| message.channel == "/site/welcome-topic-banner" }
        expect(welcome_topic_banner_message).to be_present
        expect(welcome_topic_banner_message.data).to eq(false)
      end
    end

    it "doesn't strip starting whitespaces" do
      subject.revise!(post.user, raw: "    <-- whitespaces -->    ")
      post.reload
      expect(post.raw).to eq("    <-- whitespaces -->")
    end

    it "revises and tracks changes of topic titles" do
      new_title = "New topic title"
      result = subject.revise!(
        post.user,
        { title: new_title },
        revised_at: post.updated_at + 10.minutes
      )

      expect(result).to eq(true)
      post.reload
      expect(post.topic.title).to eq(new_title)
      expect(post.revisions.first.modifications["title"][1]).to eq(new_title)
    end

    it "revises and tracks changes of topic archetypes" do
      new_archetype = Archetype.banner
      result = subject.revise!(
        post.user,
        { archetype: new_archetype },
        revised_at: post.updated_at + 10.minutes
      )

      expect(result).to eq(true)
      post.reload
      expect(post.topic.archetype).to eq(new_archetype)
      expect(post.revisions.first.modifications["archetype"][1]).to eq(new_archetype)
    end

    it "revises and tracks changes of topic tags" do
      subject.revise!(admin, tags: ['new-tag'])
      expect(post.post_revisions.last.modifications).to eq('tags' => [[], ['new-tag']])

      subject.revise!(admin, tags: ['new-tag', 'new-tag-2'])
      expect(post.post_revisions.last.modifications).to eq('tags' => [[], ['new-tag', 'new-tag-2']])

      subject.revise!(admin, tags: ['new-tag-3'])
      expect(post.post_revisions.last.modifications).to eq('tags' => [[], ['new-tag-3']])
    end

    describe "#publish_changes" do
      let!(:post) { Fabricate(:post, topic: topic) }

      it "should publish topic changes to clients" do
        revisor = PostRevisor.new(topic.ordered_posts.first, topic)

        message = MessageBus.track_publish("/topic/#{topic.id}") do
          revisor.revise!(newuser, title: 'this is a test topic')
        end.first

        payload = message.data
        expect(payload[:reload_topic]).to eq(true)
      end
    end

    context "when logging staff edits" do
      it "doesn't log when a regular user revises a post" do
        subject.revise!(
          post.user,
          raw: "lets totally update the body"
        )
        log = UserHistory.where(
          acting_user_id: post.user.id,
          action: UserHistory.actions[:post_edit]
        )
        expect(log).to be_blank
      end

      it "logs an edit when a staff member revises a post" do
        subject.revise!(
          moderator,
          raw: "lets totally update the body"
        )
        log = UserHistory.where(
          acting_user_id: moderator.id,
          action: UserHistory.actions[:post_edit]
        ).first
        expect(log).to be_present
        expect(log.details).to eq("Hello world\n\n---\n\nlets totally update the body")
      end

      it "doesn't log an edit when skip_staff_log is true" do
        subject.revise!(
          moderator,
          { raw: "lets totally update the body" },
          skip_staff_log: true
        )
        log = UserHistory.where(
          acting_user_id: moderator.id,
          action: UserHistory.actions[:post_edit]
        ).first
        expect(log).to be_blank
      end

      it "doesn't log an edit when a staff member edits their own post" do
        revisor = PostRevisor.new(
          Fabricate(:post, user: moderator)
        )
        revisor.revise!(
          moderator,
          raw: "my own edit to my own thing"
        )

        log = UserHistory.where(
          acting_user_id: moderator.id,
          action: UserHistory.actions[:post_edit]
        )
        expect(log).to be_blank
      end
    end

    context "when logging group moderator edits" do
      fab!(:group_user) { Fabricate(:group_user) }
      fab!(:category) { Fabricate(:category, reviewable_by_group_id: group_user.group.id, topic: topic) }

      before do
        SiteSetting.enable_category_group_moderation = true
        topic.update!(category: category)
        post.update!(topic: topic)
      end

      it "logs an edit when a group moderator revises the category description" do
        PostRevisor.new(post).revise!(group_user.user, raw: "a group moderator can update the description")

        log = UserHistory.where(
          acting_user_id: group_user.user.id,
          action: UserHistory.actions[:post_edit]
        ).first
        expect(log).to be_present
        expect(log.details).to eq("Hello world\n\n---\n\na group moderator can update the description")
      end
    end

    context "with staff_edit_locks_post" do
      context "when disabled" do
        before do
          SiteSetting.staff_edit_locks_post = false
        end

        it "does not lock the post when revised" do
          result = subject.revise!(
            moderator,
            raw: "lets totally update the body"
          )
          expect(result).to eq(true)
          post.reload
          expect(post).not_to be_locked

        end
      end

      context "when enabled" do
        before do
          SiteSetting.staff_edit_locks_post = true
        end

        it "locks the post when revised by staff" do
          result = subject.revise!(
            moderator,
            raw: "lets totally update the body"
          )
          expect(result).to eq(true)
          post.reload
          expect(post).to be_locked
        end

        it "doesn't lock the wiki posts" do
          post.wiki = true
          result = subject.revise!(
            moderator,
            raw: "some new raw content"
          )
          expect(result).to eq(true)
          post.reload
          expect(post).not_to be_locked
        end

        it "doesn't lock the post when the raw did not change" do
          result = subject.revise!(
            moderator,
            title: "New topic title, cool!"
          )
          expect(result).to eq(true)
          post.reload
          expect(post.topic.title).to eq("New topic title, cool!")
          expect(post).not_to be_locked
        end

        it "doesn't lock the post when revised by a regular user" do
          result = subject.revise!(
            user,
            raw: "lets totally update the body"
          )
          expect(result).to eq(true)
          post.reload
          expect(post).not_to be_locked
        end

        it "doesn't lock the post when revised by system user" do
          result = subject.revise!(
            Discourse.system_user,
            raw: "I usually replace hotlinked images"
          )
          expect(result).to eq(true)
          post.reload
          expect(post).not_to be_locked
        end

        it "doesn't lock a staff member's post" do
          staff_post = Fabricate(:post, user: moderator)
          revisor = PostRevisor.new(staff_post)

          result = revisor.revise!(
            moderator,
            raw: "lets totally update the body"
          )
          expect(result).to eq(true)
          staff_post.reload
          expect(staff_post).not_to be_locked
        end
      end
    end

    context "with alerts" do
      fab!(:mentioned_user) { Fabricate(:user) }

      before do
        Jobs.run_immediately!
      end

      it "generates a notification for a mention" do
        expect {
          subject.revise!(user, raw: "Random user is mentioning @#{mentioned_user.username_lower}")
        }.to change { Notification.where(notification_type: Notification.types[:mentioned]).count }
      end

      it "never generates a notification for a mention when the System user revise a post" do
        expect {
          subject.revise!(Discourse.system_user, raw: "System user is mentioning @#{mentioned_user.username_lower}")
        }.not_to change { Notification.where(notification_type: Notification.types[:mentioned]).count }
      end

    end

    context "with tagging" do
      context "with tagging disabled" do
        before do
          SiteSetting.tagging_enabled = false
        end

        it "doesn't add the tags" do
          result = subject.revise!(user, raw: "lets totally update the body", tags: ['totally', 'update'])
          expect(result).to eq(true)
          post.reload
          expect(post.topic.tags.size).to eq(0)
        end
      end

      context "with tagging enabled" do
        before do
          SiteSetting.tagging_enabled = true
        end

        context "when can create tags" do
          before do
            SiteSetting.min_trust_to_create_tag = 0
            SiteSetting.min_trust_level_to_tag_topics = 0
          end

          it "can create all tags if none exist" do
            expect {
              @result = subject.revise!(user, raw: "lets totally update the body", tags: ['totally', 'update'])
            }.to change { Tag.count }.by(2)
            expect(@result).to eq(true)
            post.reload
            expect(post.topic.tags.map(&:name).sort).to eq(['totally', 'update'])
          end

          it "creates missing tags if some exist" do
            Fabricate(:tag, name: 'totally')
            expect {
              @result = subject.revise!(user, raw: "lets totally update the body", tags: ['totally', 'update'])
            }.to change { Tag.count }.by(1)
            expect(@result).to eq(true)
            post.reload
            expect(post.topic.tags.map(&:name).sort).to eq(['totally', 'update'])
          end

          it "can remove all tags" do
            topic.tags = [Fabricate(:tag, name: "super"), Fabricate(:tag, name: "stuff")]
            result = subject.revise!(user, raw: "lets totally update the body", tags: [])
            expect(result).to eq(true)
            post.reload
            expect(post.topic.tags.size).to eq(0)
          end

          it "can't add staff-only tags" do
            create_staff_only_tags(['important'])
            result = subject.revise!(user, raw: "lets totally update the body", tags: ['important', 'stuff'])
            expect(result).to eq(false)
            expect(post.topic.errors.present?).to eq(true)
          end

          it "staff can add staff-only tags" do
            create_staff_only_tags(['important'])
            result = subject.revise!(admin, raw: "lets totally update the body", tags: ['important', 'stuff'])
            expect(result).to eq(true)
            post.reload
            expect(post.topic.tags.map(&:name).sort).to eq(['important', 'stuff'])
          end

          it "triggers the :post_edited event with topic_changed?" do
            topic.tags = [Fabricate(:tag, name: "super"), Fabricate(:tag, name: "stuff")]

            events = DiscourseEvent.track_events do
              subject.revise!(user, raw: "lets totally update the body", tags: [])
            end

            event = events.find { |e| e[:event_name] == :post_edited }

            expect(event[:params].first).to eq(post)
            expect(event[:params].second).to eq(true)
            expect(event[:params].third).to be_kind_of(PostRevisor)
            expect(event[:params].third.topic_diff).to eq({ "tags" => [["super", "stuff"], []] })
          end

          context "with staff-only tags" do
            before do
              create_staff_only_tags(['important'])
              topic = post.topic
              topic.tags = [Fabricate(:tag, name: "super"), Tag.where(name: "important").first, Fabricate(:tag, name: "stuff")]
            end

            it "staff-only tags can't be removed" do
              result = subject.revise!(user, raw: "lets totally update the body", tags: ['stuff'])
              expect(result).to eq(false)
              expect(post.topic.errors.present?).to eq(true)
              post.reload
              expect(post.topic.tags.map(&:name).sort).to eq(['important', 'stuff', 'super'])
            end

            it "can't remove all tags if some are staff-only" do
              result = subject.revise!(user, raw: "lets totally update the body", tags: [])
              expect(result).to eq(false)
              expect(post.topic.errors.present?).to eq(true)
              post.reload
              expect(post.topic.tags.map(&:name).sort).to eq(['important', 'stuff', 'super'])
            end

            it "staff-only tags can be removed by staff" do
              result = subject.revise!(admin, raw: "lets totally update the body", tags: ['stuff'])
              expect(result).to eq(true)
              post.reload
              expect(post.topic.tags.map(&:name)).to eq(['stuff'])
            end

            it "staff can remove all tags" do
              result = subject.revise!(admin, raw: "lets totally update the body", tags: [])
              expect(result).to eq(true)
              post.reload
              expect(post.topic.tags.size).to eq(0)
            end
          end

          context "with hidden tags" do
            let(:bumped_at) { 1.day.ago }

            before do
              topic.update!(bumped_at: bumped_at)
              create_hidden_tags(['important', 'secret'])
              topic = post.topic
              topic.tags = [Fabricate(:tag, name: "super"), Tag.where(name: "important").first, Fabricate(:tag, name: "stuff")]
            end

            it "doesn't bump topic if only staff-only tags are added" do
              expect {
                result = subject.revise!(Fabricate(:admin), raw: post.raw, tags: topic.tags.map(&:name) + ['secret'])
                expect(result).to eq(true)
              }.to_not change { topic.reload.bumped_at }
            end

            it "doesn't bump topic if only staff-only tags are removed" do
              expect {
                result = subject.revise!(Fabricate(:admin), raw: post.raw, tags: topic.tags.map(&:name) - ['important', 'secret'])
                expect(result).to eq(true)
              }.to_not change { topic.reload.bumped_at }
            end

            it "doesn't bump topic if only staff-only tags are removed and there are no tags left" do
              topic.tags = Tag.where(name: ['important', 'secret']).to_a
              expect {
                result = subject.revise!(Fabricate(:admin), raw: post.raw, tags: [])
                expect(result).to eq(true)
              }.to_not change { topic.reload.bumped_at }
            end

            it "doesn't bump topic if empty string is given" do
              topic.tags = Tag.where(name: ['important', 'secret']).to_a
              expect {
                result = subject.revise!(Fabricate(:admin), raw: post.raw, tags: [""])
                expect(result).to eq(true)
              }.to_not change { topic.reload.bumped_at }
            end

            it "should bump topic if non staff-only tags are added" do
              expect {
                result = subject.revise!(Fabricate(:admin), raw: post.raw, tags: topic.tags.map(&:name) + [Fabricate(:tag).name])
                expect(result).to eq(true)
              }.to change { topic.reload.bumped_at }
            end

            it "creates a hidden revision" do
              subject.revise!(Fabricate(:admin), raw: post.raw, tags: topic.tags.map(&:name) + ['secret'])
              expect(post.reload.revisions.first.hidden).to eq(true)
            end

            it "doesn't notify topic owner about hidden tags" do
              PostActionNotifier.enable
              Jobs.run_immediately!
              expect {
                subject.revise!(Fabricate(:admin), raw: post.raw, tags: topic.tags.map(&:name) + ['secret'])
              }.not_to change { Notification.where(notification_type: Notification.types[:edited]).count }
            end
          end

          context "with required tag group" do
            fab!(:tag1) { Fabricate(:tag) }
            fab!(:tag2) { Fabricate(:tag) }
            fab!(:tag3) { Fabricate(:tag) }
            fab!(:tag_group) { Fabricate(:tag_group, tags: [tag1, tag2]) }
            fab!(:category) { Fabricate(:category, name: "beta", category_required_tag_groups: [CategoryRequiredTagGroup.new(tag_group: tag_group, min_count: 1)]) }

            before do
              post.topic.update(category: category)
            end

            it "doesn't allow removing all tags from the group" do
              post.topic.tags = [tag1, tag2]
              result = subject.revise!(user, raw: "lets totally update the body", tags: [])
              expect(result).to eq(false)
            end

            it "allows removing some tags" do
              post.topic.tags = [tag1, tag2, tag3]
              result = subject.revise!(user, raw: "lets totally update the body", tags: [tag1.name])
              expect(result).to eq(true)
              expect(post.reload.topic.tags.map(&:name)).to eq([tag1.name])
            end

            it "allows admins to remove the tags" do
              post.topic.tags = [tag1, tag2, tag3]
              result = subject.revise!(admin, raw: "lets totally update the body", tags: [])
              expect(result).to eq(true)
              expect(post.reload.topic.tags.size).to eq(0)
            end
          end
        end

        context "when cannot create tags" do
          before do
            SiteSetting.min_trust_to_create_tag = 4
            SiteSetting.min_trust_level_to_tag_topics = 0
          end

          it "only uses existing tags" do
            Fabricate(:tag, name: 'totally')
            expect {
              @result = subject.revise!(user, raw: "lets totally update the body", tags: ['totally', 'update'])
            }.to_not change { Tag.count }
            expect(@result).to eq(true)
            post.reload
            expect(post.topic.tags.map(&:name)).to eq(['totally'])
          end
        end
      end
    end

    context "with uploads" do
      let(:image1) { Fabricate(:upload) }
      let(:image2) { Fabricate(:upload) }
      let(:image3) { Fabricate(:upload) }
      let(:image4) { Fabricate(:upload) }
      let(:post_args) do
        {
          user: user,
          topic: topic,
          raw: <<~RAW
            This is a post with multiple uploads
            ![image1](#{image1.short_url})
            ![image2](#{image2.short_url})
          RAW
        }
      end

      it "updates linked post uploads" do
        post.link_post_uploads
        expect(post.upload_references.pluck(:upload_id)).to contain_exactly(image1.id, image2.id)

        subject.revise!(user, raw: <<~RAW)
            This is a post with multiple uploads
            ![image2](#{image2.short_url})
            ![image3](#{image3.short_url})
            ![image4](#{image4.short_url})
        RAW

        expect(post.reload.upload_references.pluck(:upload_id)).to contain_exactly(image2.id, image3.id, image4.id)
      end

      context "with secure uploads uploads" do
        let!(:image5) { Fabricate(:secure_upload) }
        before do
          Jobs.run_immediately!
          setup_s3
          SiteSetting.authorized_extensions = "png|jpg|gif|mp4"
          SiteSetting.secure_uploads = true
          stub_upload(image5)
        end

        it "updates the upload secure status, which is secure by default from the composer. set to false for a public topic" do
          stub_image_size
          subject.revise!(user, raw: <<~RAW)
              This is a post with a secure upload
              ![image5](#{image5.short_url})
          RAW

          expect(image5.reload.secure).to eq(false)
          expect(image5.security_last_changed_reason).to eq("access control post dictates security | source: post revisor")
        end

        it "does not update the upload secure status, which is secure by default from the composer for a private" do
          post.topic.update(category: Fabricate(:private_category,  group: Fabricate(:group)))
          stub_image_size
          subject.revise!(user, raw: <<~RAW)
              This is a post with a secure upload
              ![image5](#{image5.short_url})
          RAW

          expect(image5.reload.secure).to eq(true)
          expect(image5.security_last_changed_reason).to eq("access control post dictates security | source: post revisor")
        end
      end
    end

    context 'with drafts' do
      it "does not advance draft sequence if keep_existing_draft option is true" do
        post = Fabricate(:post, user: user)
        topic = post.topic
        draft_key = "topic_#{topic.id}"
        data = { reply: "test 12222" }.to_json
        Draft.set(user, draft_key, 0, data)
        Draft.set(user, draft_key, 0, data)
        expect {
          PostRevisor.new(post).revise!(
            post.user,
            { title: "updated title for my topic" },
            keep_existing_draft: true
          )
        }.to not_change { Draft.where(user: user, draft_key: draft_key).first.sequence }
          .and not_change { DraftSequence.where(user_id: user.id, draft_key: draft_key).first.sequence }

        expect {
          PostRevisor.new(post).revise!(
            post.user,
            { title: "updated title for my topic" },
          )
        }.to change { Draft.where(user: user, draft_key: draft_key).count }.from(1).to(0)
          .and change { DraftSequence.where(user_id: user.id, draft_key: draft_key).first.sequence }.by(1)
      end
    end

    context 'when skipping validations' do
      fab!(:post) { Fabricate(:post, raw: 'aaa', skip_validation: true) }

      it 'can revise multiple times and remove unnecessary revisions' do
        subject.revise!(admin, { raw: 'bbb' }, skip_validations: true)
        expect(post.errors).to be_empty

        # Revert to old version which was invalid to destroy previously created
        # post revision and trigger another post save.
        subject.revise!(admin, { raw: 'aaa' }, skip_validations: true)
        expect(post.errors).to be_empty
      end
    end
  end

  context 'when the review_every_post setting is enabled' do
    let(:post) { Fabricate(:post, post_args) }
    let(:revisor) { PostRevisor.new(post) }

    before { SiteSetting.review_every_post = true }

    it 'queues the post when a regular user edits it' do
      expect {
        revisor.revise!(post.user, { raw: 'updated body' }, revised_at: post.updated_at + 10.minutes)
      }.to change(ReviewablePost, :count).by(1)
    end

    it 'does nothing when a staff member edits a post' do
      admin = Fabricate(:admin)

      expect { revisor.revise!(admin, { raw: 'updated body' }) }.not_to change(ReviewablePost, :count)
    end

    it 'skips grace period edits' do
      SiteSetting.editing_grace_period = 1.minute

      expect {
        revisor.revise!(post.user, { raw: 'updated body' }, revised_at: post.updated_at + 10.seconds)
      }.not_to change(ReviewablePost, :count)
    end
  end
end