discourse/spec/components/post_creator_spec.rb

# frozen_string_literal: true

require 'rails_helper'
require 'post_creator'
require 'topic_subtype'

describe PostCreator do

  fab!(:user) { Fabricate(:user) }
  let(:topic) { Fabricate(:topic, user: user) }

  context "new topic" do
    fab!(:category) { Fabricate(:category, user: user) }
    let(:basic_topic_params) { { title: "hello world topic", raw: "my name is fred", archetype_id: 1 } }
    let(:image_sizes) { { 'http://an.image.host/image.jpg' => { "width" => 111, "height" => 222 } } }

    let(:creator) { PostCreator.new(user, basic_topic_params) }
    let(:creator_with_category) { PostCreator.new(user, basic_topic_params.merge(category: category.id)) }
    let(:creator_with_meta_data) { PostCreator.new(user, basic_topic_params.merge(meta_data: { hello: "world" })) }
    let(:creator_with_image_sizes) { PostCreator.new(user, basic_topic_params.merge(image_sizes: image_sizes)) }
    let(:creator_with_featured_link) { PostCreator.new(user, title: "featured link topic", archetype_id: 1, featured_link: "http://www.discourse.org", raw: "http://www.discourse.org") }

    it "can create a topic with null byte central" do
      post = PostCreator.create(user, title: "hello\u0000world this is title", raw: "this is my\u0000 first topic")
      expect(post.raw).to eq 'this is my first topic'
      expect(post.topic.title).to eq 'Helloworld this is title'
    end

    it "can be created with auto tracking disabled" do
      p = PostCreator.create(user, basic_topic_params.merge(auto_track: false))
      # must be 0 otherwise it will think we read the topic which is clearly untrue
      expect(TopicUser.where(user_id: p.user_id, topic_id: p.topic_id).count).to eq(0)
    end

    it "can be created with first post as wiki" do
      cat = Fabricate(:category)
      cat.all_topics_wiki = true
      cat.save
      post = PostCreator.create(user, basic_topic_params.merge(category: cat.id))
      expect(post.wiki).to eq(true)
    end

    it "can be created with a hidden reason" do
      hri = Post.hidden_reasons[:flag_threshold_reached]
      post = PostCreator.create(user, basic_topic_params.merge(hidden_reason_id: hri))
      expect(post.hidden).to eq(true)
      expect(post.hidden_at).to be_present
      expect(post.hidden_reason_id).to eq(hri)
      expect(post.topic.visible).to eq(false)
    end

    it "ensures the user can create the topic" do
      Guardian.any_instance.expects(:can_create?).with(Topic, nil).returns(false)
      expect { creator.create }.to raise_error(Discourse::InvalidAccess)
    end

    it "can be created with custom fields" do
      post = PostCreator.create(user, basic_topic_params.merge(topic_opts: { custom_fields: { hello: "world" } }))
      expect(post.topic.custom_fields).to eq("hello" => "world")
    end

    context "reply to post number" do
      it "omits reply to post number if received on a new topic" do
        p = PostCreator.new(user, basic_topic_params.merge(reply_to_post_number: 3)).create
        expect(p.reply_to_post_number).to be_nil
      end
    end

    context "invalid title" do
      let(:creator_invalid_title) { PostCreator.new(user, basic_topic_params.merge(title: 'a')) }

      it "has errors" do
        creator_invalid_title.create
        expect(creator_invalid_title.errors).to be_present
      end
    end

    context "invalid raw" do
      let(:creator_invalid_raw) { PostCreator.new(user, basic_topic_params.merge(raw: '')) }

      it "has errors" do
        creator_invalid_raw.create
        expect(creator_invalid_raw.errors).to be_present
      end
    end

    context "success" do
      before { creator }

      it "is not hidden" do
        p = creator.create
        expect(p.hidden).to eq(false)
        expect(p.hidden_at).not_to be_present
        expect(p.hidden_reason_id).to eq(nil)
        expect(p.topic.visible).to eq(true)
      end

      it "doesn't return true for spam" do
        creator.create
        expect(creator.spam?).to eq(false)
      end

      it "triggers extensibility events" do
        events = DiscourseEvent.track_events { creator.create }

        expect(events.map { |event| event[:event_name] }).to include(
          :before_create_post,
          :validate_post,
          :topic_created,
          :post_created,
          :after_validate_topic,
          :before_create_topic,
          :after_trigger_post_process,
          :markdown_context,
          :topic_notification_level_changed,
        )
      end

      it "does not notify on system messages" do
        admin = Fabricate(:admin)
        messages = MessageBus.track_publish do
          p = PostCreator.create(admin, basic_topic_params.merge(post_type: Post.types[:moderator_action]))
          PostCreator.create(admin, basic_topic_params.merge(topic_id: p.topic_id, post_type: Post.types[:moderator_action]))
        end
        # don't notify on system messages they introduce too much noise
        channels = messages.map(&:channel)
        expect(channels.find { |s| s =~ /unread/ }).to eq(nil)
        expect(channels.find { |s| s =~ /new/ }).to eq(nil)
      end

      it "generates the correct messages for a secure topic" do

        UserActionManager.enable

        admin = Fabricate(:admin)

        cat = Fabricate(:category)
        cat.set_permissions(admins: :full)
        cat.save

        created_post = nil
        reply = nil

        messages = MessageBus.track_publish do
          created_post = PostCreator.new(admin, basic_topic_params.merge(category: cat.id)).create
          reply = PostCreator.new(admin, raw: "this is my test reply 123 testing", topic_id: created_post.topic_id).create
        end

        # 2 for topic, one to notify of new topic another for tracking state
        expect(messages.map { |m| m.channel }.sort).to eq([ "/new",
                                                     "/u/#{admin.username}",
                                                     "/u/#{admin.username}",
                                                     "/unread/#{admin.id}",
                                                     "/unread/#{admin.id}",
                                                     "/latest",
                                                     "/latest",
                                                     "/topic/#{created_post.topic_id}",
                                                     "/topic/#{created_post.topic_id}"
                                                   ].sort)
        admin_ids = [Group[:admins].id]

        expect(messages.any? { |m| m.group_ids != admin_ids && m.user_ids != [admin.id] }).to eq(false)
      end

      it 'generates the correct messages for a normal topic' do

        UserActionManager.enable

        p = nil
        messages = MessageBus.track_publish do
          p = creator.create
        end

        latest = messages.find { |m| m.channel == "/latest" }
        expect(latest).not_to eq(nil)

        latest = messages.find { |m| m.channel == "/new" }
        expect(latest).not_to eq(nil)

        read = messages.find { |m| m.channel == "/unread/#{p.user_id}" }
        expect(read).not_to eq(nil)

        user_action = messages.find { |m| m.channel == "/u/#{p.user.username}" }
        expect(user_action).not_to eq(nil)

        expect(messages.filter { |m| m.channel != "/distributed_hash" }.length).to eq(5)
      end

      it 'extracts links from the post' do
        create_post(raw: "this is a link to the best site at https://google.com")
        creator.create
        expect(TopicLink.count).to eq(1)
      end

      it 'queues up post processing job when saved' do
        creator.create

        post = Post.last
        post_id = post.id
        topic_id = post.topic_id

        process_post_args = Jobs::ProcessPost.jobs.first["args"].first
        expect(process_post_args["post_id"]).to eq(post_id)

        feature_topic_users_args = Jobs::FeatureTopicUsers.jobs.first["args"].first
        expect(feature_topic_users_args["topic_id"]).to eq(topic_id)

        post_alert_args = Jobs::PostAlert.jobs.first["args"].first
        expect(post_alert_args["post_id"]).to eq(post_id)

        notify_mailing_list_subscribers_args =
          Jobs::NotifyMailingListSubscribers.jobs.first["args"].first

        expect(notify_mailing_list_subscribers_args["post_id"]).to eq(post_id)
      end

      it 'passes the invalidate_oneboxes along to the job if present' do
        Jobs.stubs(:enqueue).with(:feature_topic_users, has_key(:topic_id))
        Jobs.expects(:enqueue).with(:notify_mailing_list_subscribers, has_key(:post_id))
        Jobs.expects(:enqueue).with(:post_alert, has_key(:post_id))
        Jobs.expects(:enqueue).with(:process_post, has_key(:invalidate_oneboxes))
        creator.opts[:invalidate_oneboxes] = true
        creator.create
      end

      it 'passes the image_sizes along to the job if present' do
        Jobs.stubs(:enqueue).with(:feature_topic_users, has_key(:topic_id))
        Jobs.expects(:enqueue).with(:notify_mailing_list_subscribers, has_key(:post_id))
        Jobs.expects(:enqueue).with(:post_alert, has_key(:post_id))
        Jobs.expects(:enqueue).with(:process_post, has_key(:image_sizes))
        creator.opts[:image_sizes] = { 'http://an.image.host/image.jpg' => { 'width' => 17, 'height' => 31 } }
        creator.create
      end

      it 'assigns a category when supplied' do
        expect(creator_with_category.create.topic.category).to eq(category)
      end

      it 'adds  meta data from the post' do
        expect(creator_with_meta_data.create.topic.meta_data['hello']).to eq('world')
      end

      it 'passes the image sizes through' do
        Post.any_instance.expects(:image_sizes=).with(image_sizes)
        creator_with_image_sizes.create
      end

      it 'increases topic response counts' do
        first_post = creator.create

        # ensure topic user is correct
        topic_user = first_post.user.topic_users.find_by(topic_id: first_post.topic_id)
        expect(topic_user).to be_present
        expect(topic_user).to be_posted
        expect(topic_user.last_read_post_number).to eq(first_post.post_number)
        expect(topic_user.highest_seen_post_number).to eq(first_post.post_number)

        user2 = Fabricate(:coding_horror)
        expect(user2.user_stat.topic_reply_count).to eq(0)

        expect(first_post.user.user_stat.reload.topic_reply_count).to eq(0)

        PostCreator.new(user2, topic_id: first_post.topic_id, raw: "this is my test post 123").create

        expect(first_post.user.user_stat.reload.topic_reply_count).to eq(0)

        expect(user2.user_stat.reload.topic_reply_count).to eq(1)
      end

      it 'sets topic excerpt if first post, but not second post' do
        first_post = creator.create
        topic = first_post.topic.reload
        expect(topic.excerpt).to be_present
        expect {
          PostCreator.new(first_post.user, topic_id: first_post.topic_id, raw: "this is the second post").create
          topic.reload
        }.to_not change { topic.excerpt }
      end

      it 'supports custom excerpts' do
        raw = <<~MD
          <div class='excerpt'>
          I am

          a custom excerpt
          </div>

          testing
        MD
        post = create_post(raw: raw)

        expect(post.excerpt).to eq("I am\na custom excerpt")
      end

      it 'creates post stats' do

        Draft.set(user, 'new_topic', 0, "test")
        Draft.set(user, 'new_topic', 0, "test1")

        begin
          PostCreator.track_post_stats = true
          post = creator.create
          expect(post.post_stat.typing_duration_msecs).to eq(0)
          expect(post.post_stat.drafts_saved).to eq(2)
        ensure
          PostCreator.track_post_stats = false
        end
      end

      it "updates topic stats" do
        first_post = creator.create
        topic = first_post.topic.reload

        expect(topic.last_posted_at).to be_within(1.seconds).of(first_post.created_at)
        expect(topic.last_post_user_id).to eq(first_post.user_id)
        expect(topic.word_count).to eq(4)
      end

      it 'creates a post with featured link' do
        SiteSetting.topic_featured_link_enabled = true
        SiteSetting.min_first_post_length = 100

        post = creator_with_featured_link.create
        expect(post.topic.featured_link).to eq('http://www.discourse.org')
        expect(post.valid?).to eq(true)
      end

      it 'allows notification email to be skipped' do
        user_2 = Fabricate(:user)

        creator = PostCreator.new(user,
          title: 'hi there welcome to my topic',
          raw: "this is my awesome message @#{user_2.username_lower}",
          archetype: Archetype.private_message,
          target_usernames: [user_2.username],
          post_alert_options: { skip_send_email: true }
        )

        NotificationEmailer.expects(:process_notification).never

        creator.create
      end

      describe "topic's auto close" do
        it "doesn't update topic's auto close when it's not based on last post" do
          freeze_time

          topic = Fabricate(:topic).set_or_create_timer(TopicTimer.types[:close], 12)
          PostCreator.new(topic.user, topic_id: topic.id, raw: "this is a second post").create
          topic.reload

          topic_status_update = TopicTimer.last
          expect(topic_status_update.execute_at).to be_within(1.second).of(Time.zone.now + 12.hours)
          expect(topic_status_update.created_at).to be_within(1.second).of(Time.zone.now)
        end

        describe "topic's auto close based on last post" do
          fab!(:topic_timer) do
            Fabricate(:topic_timer,
              based_on_last_post: true,
              execute_at: Time.zone.now - 12.hours,
              created_at: Time.zone.now - 24.hours
            )
          end

          let(:topic) { topic_timer.topic }

          fab!(:post) do
            Fabricate(:post, topic: topic_timer.topic)
          end

          it "updates topic's auto close date" do
            freeze_time
            post

            PostCreator.new(
              topic.user,
              topic_id: topic.id,
              raw: "this is a second post"
            ).create

            topic_timer.reload

            expect(topic_timer.execute_at).to eq_time(Time.zone.now + 12.hours)
            expect(topic_timer.created_at).to eq_time(Time.zone.now)
          end

          describe "when auto_close_topics_post_count has been reached" do
            before do
              SiteSetting.auto_close_topics_post_count = 2
            end

            it "closes the topic and deletes the topic timer" do
              freeze_time
              post

              PostCreator.new(
                topic.user,
                topic_id: topic.id,
                raw: "this is a second post"
              ).create

              topic.reload

              expect(topic.posts.last.raw).to eq(I18n.t(
                'topic_statuses.autoclosed_topic_max_posts',
                count: SiteSetting.auto_close_topics_post_count
              ))

              expect(topic.closed).to eq(true)
              expect(topic_timer.reload.deleted_at).to eq_time(Time.zone.now)
            end
          end
        end
      end

      context "tags" do
        let(:tag_names) { ['art', 'science', 'dance'] }
        let(:creator_with_tags) { PostCreator.new(user, basic_topic_params.merge(tags: tag_names)) }

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

          it "doesn't create tags" do
            expect { @post = creator_with_tags.create }.to change { Tag.count }.by(0)
            expect(@post.topic.tags.size).to eq(0)
          end
        end

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

          context "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 { @post = creator_with_tags.create }.to change { Tag.count }.by(tag_names.size)
              expect(@post.topic.tags.map(&:name).sort).to eq(tag_names.sort)
            end

            it "creates missing tags if some exist" do
              existing_tag1 = Fabricate(:tag, name: tag_names[0])
              existing_tag1 = Fabricate(:tag, name: tag_names[1])
              expect { @post = creator_with_tags.create }.to change { Tag.count }.by(tag_names.size - 2)
              expect(@post.topic.tags.map(&:name).sort).to eq(tag_names.sort)
            end
          end

          context "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
              existing_tag1 = Fabricate(:tag, name: tag_names[1])
              expect { @post = creator_with_tags.create }.to change { Tag.count }.by(0)
              expect(@post.topic.tags.map(&:name)).to eq([existing_tag1.name])
            end
          end
        end
      end
    end

    context 'when auto-close param is given' do
      it 'ensures the user can auto-close the topic, but ignores auto-close param silently' do
        Guardian.any_instance.stubs(:can_moderate?).returns(false)
        expect {
          PostCreator.new(user, basic_topic_params.merge(auto_close_time: 2)).create!
        }.to_not change { TopicTimer.count }
      end
    end
  end

  context 'whisper' do
    fab!(:topic) { Fabricate(:topic, user: user) }

    it 'whispers do not mess up the public view' do
      first = PostCreator.new(user,
        topic_id: topic.id,
        raw: 'this is the first post').create

      user_stat = user.user_stat

      whisper = PostCreator.new(user,
        topic_id: topic.id,
        reply_to_post_number: 1,
        post_type: Post.types[:whisper],
        raw: 'this is a whispered reply').create

      # don't count whispers in user stats
      expect(user_stat.reload.post_count).to eq(0)

      expect(whisper).to be_present
      expect(whisper.post_type).to eq(Post.types[:whisper])

      whisper_reply = PostCreator.new(user,
        topic_id: topic.id,
        reply_to_post_number: whisper.post_number,
        post_type: Post.types[:regular],
        raw: 'replying to a whisper this time').create

      expect(whisper_reply).to be_present
      expect(whisper_reply.post_type).to eq(Post.types[:whisper])

      expect(user_stat.reload.post_count).to eq(0)

      # date is not precise enough in db
      whisper_reply.reload

      first.reload
      # does not leak into the OP
      expect(first.reply_count).to eq(0)

      topic.reload

      # cause whispers should not muck up that number
      expect(topic.highest_post_number).to eq(1)
      expect(topic.reply_count).to eq(0)
      expect(topic.posts_count).to eq(1)
      expect(topic.highest_staff_post_number).to eq(3)
      expect(topic.last_posted_at).to be_within(1.seconds).of(first.created_at)
      expect(topic.last_post_user_id).to eq(first.user_id)
      expect(topic.word_count).to eq(5)

      topic.update_columns(
        highest_staff_post_number: 0,
        highest_post_number: 0,
        posts_count: 0,
        last_posted_at: 1.year.ago
      )

      Topic.reset_highest(topic.id)

      topic.reload
      expect(topic.highest_post_number).to eq(1)
      expect(topic.posts_count).to eq(1)
      expect(topic.last_posted_at).to eq(first.created_at)
      expect(topic.highest_staff_post_number).to eq(3)
    end
  end

  context 'uniqueness' do

    fab!(:topic) { Fabricate(:topic, user: user) }
    let(:basic_topic_params) { { raw: 'test reply', topic_id: topic.id, reply_to_post_number: 4 } }
    let(:creator) { PostCreator.new(user, basic_topic_params) }

    context "disabled" do
      before do
        SiteSetting.unique_posts_mins = 0
        creator.create
      end

      it "returns true for another post with the same content" do
        new_creator = PostCreator.new(user, basic_topic_params)
        expect(new_creator.create).to be_present
      end
    end

    context 'enabled' do
      let(:new_post_creator) { PostCreator.new(user, basic_topic_params) }

      before do
        SiteSetting.unique_posts_mins = 10
      end

      it "fails for dupe post accross topic" do
        first = create_post(raw: "this is a test #{SecureRandom.hex}")
        second = create_post(raw: "this is a test #{SecureRandom.hex}")

        dupe = "hello 123 test #{SecureRandom.hex}"

        response_1 = PostCreator.create(first.user, raw: dupe, topic_id: first.topic_id)
        response_2 = PostCreator.create(first.user, raw: dupe, topic_id: second.topic_id)

        expect(response_1.errors.count).to eq(0)
        expect(response_2.errors.count).to eq(1)
      end

      it "returns blank for another post with the same content" do
        creator.create
        post = new_post_creator.create

        expect(post.errors[:raw]).to include(I18n.t(:just_posted_that))
      end

      it "returns a post for admins" do
        creator.create
        user.admin = true
        new_post_creator.create
        expect(new_post_creator.errors).to be_blank
      end

      it "returns a post for moderators" do
        creator.create
        user.moderator = true
        new_post_creator.create
        expect(new_post_creator.errors).to be_blank
      end
    end

  end

  context "host spam" do

    fab!(:topic) { Fabricate(:topic, user: user) }
    let(:basic_topic_params) { { raw: 'test reply', topic_id: topic.id, reply_to_post_number: 4 } }
    let(:creator) { PostCreator.new(user, basic_topic_params) }

    before do
      Post.any_instance.expects(:has_host_spam?).returns(true)
    end

    it "does not create the post" do
      GroupMessage.stubs(:create)
      _post = creator.create

      expect(creator.errors).to be_present
      expect(creator.spam?).to eq(true)
    end

    it "sends a message to moderators" do
      GroupMessage.expects(:create).with do |group_name, msg_type, params|
        group_name == (Group[:moderators].name) && msg_type == (:spam_post_blocked) && params[:user].id == (user.id)
      end
      creator.create
    end

  end

  # more integration testing ... maximise our testing
  context 'existing topic' do
    fab!(:topic) { Fabricate(:topic, user: user, title: 'topic title with 25 chars') }
    let(:creator) { PostCreator.new(user, raw: 'test reply', topic_id: topic.id, reply_to_post_number: 4) }

    it 'ensures the user can create the post' do
      Guardian.any_instance.expects(:can_create?).with(Post, topic).returns(false)
      post = creator.create
      expect(post).to be_blank
      expect(creator.errors.count).to eq 1
      expect(creator.errors.messages[:base][0]).to match I18n.t(:topic_not_found)
    end

    context 'success' do
      it 'create correctly' do
        post = creator.create
        expect(Post.count).to eq(1)
        expect(Topic.count).to eq(1)
        expect(post.reply_to_post_number).to eq(4)
      end
    end

    context "topic stats" do
      before do
        PostCreator.new(
          Fabricate(:coding_horror),
          raw: 'first post in topic',
          topic_id: topic.id,
          created_at: Time.zone.now - 24.hours
        ).create
      end

      it "updates topic stats" do
        post = creator.create
        topic.reload

        expect(topic.last_posted_at).to be_within(1.seconds).of(post.created_at)
        expect(topic.last_post_user_id).to eq(post.user_id)
        expect(topic.word_count).to eq(6)
      end

      it "updates topic stats even when topic fails validation" do
        topic.update_columns(title: 'below 15 chars')

        post = creator.create
        topic.reload

        expect(topic.last_posted_at).to be_within(1.seconds).of(post.created_at)
        expect(topic.last_post_user_id).to eq(post.user_id)
        expect(topic.word_count).to eq(6)
      end
    end
  end

  context 'closed topic' do
    fab!(:topic) { Fabricate(:topic, user: user, closed: true) }
    let(:creator) { PostCreator.new(user, raw: 'test reply', topic_id: topic.id, reply_to_post_number: 4) }

    it 'responds with an error message' do
      post = creator.create
      expect(post).to be_blank
      expect(creator.errors.count).to eq 1
      expect(creator.errors.messages[:base][0]).to match I18n.t(:topic_not_found)
    end
  end

  context 'missing topic' do
    let(:topic) { Fabricate(:topic, user: user, deleted_at: 5.minutes.ago) }
    let(:creator) { PostCreator.new(user, raw: 'test reply', topic_id: topic.id, reply_to_post_number: 4) }

    it 'responds with an error message' do
      post = creator.create
      expect(post).to be_blank
      expect(creator.errors.count).to eq 1
      expect(creator.errors.messages[:base][0]).to match I18n.t(:topic_not_found)
    end
  end

  context "cooking options" do
    let(:raw) { "this is my awesome message body hello world" }

    it "passes the cooking options through correctly" do
      creator = PostCreator.new(user,
                                title: 'hi there welcome to my topic',
                                raw: raw,
                                cooking_options: { traditional_markdown_linebreaks: true })

      Post.any_instance.expects(:cook).with(raw, has_key(:traditional_markdown_linebreaks)).returns(raw)
      creator.create
    end
  end

  # integration test ... minimise db work
  context 'private message' do
    let(:target_user1) { Fabricate(:coding_horror) }
    fab!(:target_user2) { Fabricate(:moderator) }
    fab!(:unrelated) { Fabricate(:user) }
    let(:post) do
      PostCreator.create(user, title: 'hi there welcome to my topic',
                               raw: "this is my awesome message @#{unrelated.username_lower}",
                               archetype: Archetype.private_message,
                               target_usernames: [target_user1.username, target_user2.username].join(','),
                               category: 1)
    end

    it 'acts correctly' do
      # It's not a warning
      expect(post.topic.user_warning).to be_blank

      expect(post.topic.archetype).to eq(Archetype.private_message)
      expect(post.topic.subtype).to eq(TopicSubtype.user_to_user)
      expect(post.topic.topic_allowed_users.count).to eq(3)

      # PMs can't have a category
      expect(post.topic.category).to eq(nil)

      # does not notify an unrelated user
      expect(unrelated.notifications.count).to eq(0)
      expect(post.topic.subtype).to eq(TopicSubtype.user_to_user)

      # PMs do not increase post count or topic count
      expect(post.user.user_stat.post_count).to eq(0)
      expect(post.user.user_stat.topic_count).to eq(0)

      # archive this message and ensure archive is cleared for all users on reply
      UserArchivedMessage.create(user_id: target_user2.id, topic_id: post.topic_id)

      # if an admin replies they should be added to the allowed user list
      admin = Fabricate(:admin)
      PostCreator.create(admin, raw: 'hi there welcome topic, I am a mod',
                                topic_id: post.topic_id)

      post.topic.reload
      expect(post.topic.topic_allowed_users.where(user_id: admin.id).count).to eq(1)

      expect(UserArchivedMessage.where(user_id: target_user2.id, topic_id: post.topic_id).count).to eq(0)

      # if another admin replies and is already member of the group, don't add them to topic_allowed_users
      group = Fabricate(:group)
      post.topic.topic_allowed_groups.create!(group: group)
      admin2 = Fabricate(:admin)
      group.add(admin2)

      PostCreator.create(admin2, raw: 'I am also an admin, and a mod', topic_id: post.topic_id)

      expect(post.topic.topic_allowed_users.where(user_id: admin2.id).count).to eq(0)
    end

    it 'does not increase posts count for small actions' do
      topic = Fabricate(:private_message_topic, user: Fabricate(:user))

      Fabricate(:post, topic: topic)

      1.upto(3) do |i|
        user = Fabricate(:user)
        topic.invite(topic.user, user.username)
        topic.reload
        expect(topic.posts_count).to eq(1)
        expect(topic.posts.where(post_type: Post.types[:small_action]).count).to eq(i)
      end

      Fabricate(:post, topic: topic)
      Topic.reset_highest(topic.id)
      expect(topic.reload.posts_count).to eq(2)

      Fabricate(:post, topic: topic)
      Topic.reset_all_highest!
      expect(topic.reload.posts_count).to eq(3)
    end
  end

  context "warnings" do
    let(:target_user1) { Fabricate(:coding_horror) }
    fab!(:target_user2) { Fabricate(:moderator) }
    let(:base_args) do
      { title: 'you need a warning buddy!',
        raw: "you did something bad and I'm telling you about it!",
        is_warning: true,
        target_usernames: target_user1.username,
        category: 1 }
    end

    it "works as expected" do
      # Invalid archetype
      creator = PostCreator.new(user, base_args)
      creator.create
      expect(creator.errors).to be_present

      # Too many users
      creator = PostCreator.new(user, base_args.merge(archetype: Archetype.private_message,
                                                      target_usernames: [target_user1.username, target_user2.username].join(',')))
      creator.create
      expect(creator.errors).to be_present

      # Success
      creator = PostCreator.new(user, base_args.merge(archetype: Archetype.private_message))
      post = creator.create
      expect(creator.errors).to be_blank

      topic = post.topic
      expect(topic).to be_present
      expect(topic.user_warning).to be_present
      expect(topic.subtype).to eq(TopicSubtype.moderator_warning)
      expect(topic.user_warning.user).to eq(target_user1)
      expect(topic.user_warning.created_by).to eq(user)
      expect(target_user1.user_warnings.count).to eq(1)
    end
  end

  context 'auto closing' do
    it 'closes private messages that have more than N posts' do
      SiteSetting.auto_close_messages_post_count = 2

      admin = Fabricate(:admin)

      post1 = create_post(archetype: Archetype.private_message,
                          target_usernames: [admin.username])

      expect do
        create_post(user: post1.user, topic_id: post1.topic_id)
      end.to change { Post.count }.by(2)

      post1.topic.reload

      expect(post1.topic.posts.last.raw).to eq(I18n.t(
        'topic_statuses.autoclosed_message_max_posts',
        count: SiteSetting.auto_close_messages_post_count
      ))

      expect(post1.topic.closed).to eq(true)
    end

    it 'closes topics that have more than N posts' do
      SiteSetting.auto_close_topics_post_count = 2

      post1 = create_post

      expect do
        create_post(user: post1.user, topic_id: post1.topic_id)
      end.to change { Post.count }.by(2)

      post1.topic.reload

      expect(post1.topic.posts.last.raw).to eq(I18n.t(
        'topic_statuses.autoclosed_topic_max_posts',
        count: SiteSetting.auto_close_topics_post_count
      ))

      expect(post1.topic.closed).to eq(true)
    end
  end

  context 'private message to group' do
    let(:target_user1) { Fabricate(:coding_horror) }
    fab!(:target_user2) { Fabricate(:moderator) }
    let(:group) do
      g = Fabricate.build(:group, messageable_level: Group::ALIAS_LEVELS[:everyone])
      g.add(target_user1)
      g.add(target_user2)
      g.save
      g
    end
    fab!(:unrelated) { Fabricate(:user) }
    let(:post) do
      PostCreator.create!(user,
        title: 'hi there welcome to my topic',
        raw: "this is my awesome message @#{unrelated.username_lower}",
        archetype: Archetype.private_message,
        target_group_names: group.name
      )
    end

    it 'can post to a group correctly' do
      Jobs.run_immediately!

      expect(post.topic.archetype).to eq(Archetype.private_message)
      expect(post.topic.topic_allowed_users.count).to eq(1)
      expect(post.topic.topic_allowed_groups.count).to eq(1)

      # does not notify an unrelated user
      expect(unrelated.notifications.count).to eq(0)
      expect(post.topic.subtype).to eq(TopicSubtype.user_to_user)

      expect(target_user1.notifications.count).to eq(1)
      expect(target_user2.notifications.count).to eq(1)
    end
  end

  context 'setting created_at' do
    created_at = 1.week.ago
    let(:topic) do
      PostCreator.create(user,
                         raw: 'This is very interesting test post content',
                         title: 'This is a very interesting test post title',
                         created_at: created_at)
    end

    let(:post) do
      PostCreator.create(user,
                         raw: 'This is very interesting test post content',
                         topic_id: Topic.last,
                         created_at: created_at)
    end

    it 'acts correctly' do
      expect(topic.created_at).to be_within(10.seconds).of(created_at)
      expect(post.created_at).to be_within(10.seconds).of(created_at)
    end
  end

  context 'disable validations' do
    it 'can save a post' do
      creator = PostCreator.new(user, raw: 'q', title: 'q', skip_validations: true)
      creator.create
      expect(creator.errors).to be_blank
    end
  end

  describe "word_count" do
    it "has a word count" do
      creator = PostCreator.new(user, title: 'some inspired poetry for a rainy day', raw: 'mary had a little lamb, little lamb, little lamb. mary had a little lamb. Здравствуйте')
      post = creator.create
      expect(post.word_count).to eq(15)

      post.topic.reload
      expect(post.topic.word_count).to eq(15)
    end
  end

  describe "embed_url" do

    let(:embed_url) { "http://eviltrout.com/stupid-url" }

    it "creates the topic_embed record" do
      creator = PostCreator.new(user,
                                embed_url: embed_url,
                                title: 'Reviews of Science Ovens',
                                raw: 'Did you know that you can use microwaves to cook your dinner? Science!')
      creator.create
      expect(creator.errors).to be_blank
      expect(TopicEmbed.where(embed_url: embed_url).exists?).to eq(true)

      # If we try to create another topic with the embed url, should fail
      creator = PostCreator.new(user,
                                embed_url: embed_url,
                                title: 'More Reviews of Science Ovens',
                                raw: 'As if anyone ever wanted to learn more about them!')
      result = creator.create
      expect(result).to be_present
      expect(creator.errors).to be_present
    end
  end

  describe "read credit for creator" do
    it "should give credit to creator" do
      post = create_post
      expect(PostTiming.find_by(topic_id: post.topic_id,
                                post_number: post.post_number,
                                user_id: post.user_id).msecs).to be > 0

      expect(TopicUser.find_by(topic_id: post.topic_id,
                               user_id: post.user_id).last_read_post_number).to eq(1)
    end
  end

  describe "suspended users" do
    it "does not allow suspended users to create topics" do
      user = Fabricate(:user, suspended_at: 1.month.ago, suspended_till: 1.month.from_now)

      creator = PostCreator.new(user, title: "my test title 123", raw: "I should not be allowed to post")
      creator.create
      expect(creator.errors.count).to be > 0
    end
  end

  it "doesn't strip starting whitespaces" do
    pc = PostCreator.new(user, title: "testing whitespace stripping", raw: "    <-- whitespaces -->    ")
    post = pc.create
    expect(post.raw).to eq("    <-- whitespaces -->")
  end

  context "events" do
    before do
      @posts_created = 0
      @topics_created = 0

      @increase_posts = -> (post, opts, user) { @posts_created += 1 }
      @increase_topics = -> (topic, opts, user) { @topics_created += 1 }
      DiscourseEvent.on(:post_created, &@increase_posts)
      DiscourseEvent.on(:topic_created, &@increase_topics)
    end

    after do
      DiscourseEvent.off(:post_created, &@increase_posts)
      DiscourseEvent.off(:topic_created, &@increase_topics)
    end

    it "fires boths event when creating a topic" do
      pc = PostCreator.new(user, raw: 'this is the new content for my topic', title: 'this is my new topic title')
      _post = pc.create
      expect(@posts_created).to eq(1)
      expect(@topics_created).to eq(1)
    end

    it "fires only the post event when creating a post" do
      pc = PostCreator.new(user, topic_id: topic.id, raw: 'this is the new content for my post')
      _post = pc.create
      expect(@posts_created).to eq(1)
      expect(@topics_created).to eq(0)
    end
  end

  context "staged users" do
    fab!(:staged) { Fabricate(:staged) }

    it "automatically watches all messages it participates in" do
      post = PostCreator.create(staged,
        title: "this is the title of a topic created by a staged user",
        raw: "this is the content of a topic created by a staged user ;)"
      )
      topic_user = TopicUser.find_by(user_id: staged.id, topic_id: post.topic_id)
      expect(topic_user.notification_level).to eq(TopicUser.notification_levels[:watching])
      expect(topic_user.notifications_reason_id).to eq(TopicUser.notification_reasons[:auto_watch])
    end
  end

  context "topic tracking" do
    it "automatically watches topic based on preference" do
      user.user_option.notification_level_when_replying = 3

      admin = Fabricate(:admin)
      topic = PostCreator.create(admin,
                                 title: "this is the title of a topic created by an admin for watching notification",
                                 raw: "this is the content of a topic created by an admin for keeping a watching notification state on a topic ;)"
      )

      post = PostCreator.create(user,
                                topic_id: topic.topic_id,
                                raw: "this is a reply to set the tracking state to watching ;)"
      )
      topic_user = TopicUser.find_by(user_id: user.id, topic_id: post.topic_id)
      expect(topic_user.notification_level).to eq(TopicUser.notification_levels[:watching])
    end

    it "topic notification level remains tracking based on preference" do
      user.user_option.notification_level_when_replying = 2

      admin = Fabricate(:admin)
      topic = PostCreator.create(admin,
                                 title: "this is the title of a topic created by an admin for tracking notification",
                                 raw: "this is the content of a topic created by an admin for keeping a tracking notification state on a topic ;)"
      )

      post = PostCreator.create(user,
                                topic_id: topic.topic_id,
                                raw: "this is a reply to set the tracking state to tracking ;)"
      )
      topic_user = TopicUser.find_by(user_id: user.id, topic_id: post.topic_id)
      expect(topic_user.notification_level).to eq(TopicUser.notification_levels[:tracking])
    end

    it "topic notification level is normal based on preference" do
      user.user_option.notification_level_when_replying = 1

      admin = Fabricate(:admin)
      topic = PostCreator.create(admin,
                                 title: "this is the title of a topic created by an admin for tracking notification",
                                 raw: "this is the content of a topic created by an admin for keeping a tracking notification state on a topic ;)"
      )

      post = PostCreator.create(user,
                                topic_id: topic.topic_id,
                                raw: "this is a reply to set the tracking state to normal ;)"
      )
      topic_user = TopicUser.find_by(user_id: user.id, topic_id: post.topic_id)
      expect(topic_user.notification_level).to eq(TopicUser.notification_levels[:regular])
    end

    it "user preferences for notification level when replying doesn't affect PMs" do
      user.user_option.update!(notification_level_when_replying: 1)

      admin = Fabricate(:admin)
      pm = Fabricate(:private_message_topic, user: admin)

      pm.invite(admin, user.username)
      PostCreator.create(
        user,
        topic_id: pm.id,
        raw: "this is a test reply 123 123 ;)"
      )
      topic_user = TopicUser.find_by(user_id: user.id, topic_id: pm.id)
      expect(topic_user.notification_level).to eq(3)
    end
  end

  describe '#create!' do
    it "should return the post if it was successfully created" do
      title = "This is a valid title"
      raw = "This is a really awesome post"

      post_creator = PostCreator.new(user, title: title, raw: raw)
      post = post_creator.create

      expect(post).to eq(Post.last)
      expect(post.topic.title).to eq(title)
      expect(post.raw).to eq(raw)
    end

    it "should raise an error when post fails to be created" do
      post_creator = PostCreator.new(user, title: '', raw: '')
      expect { post_creator.create! }.to raise_error(ActiveRecord::RecordNotSaved)
    end

    it "does not generate an alert for empty posts" do
      Jobs.run_immediately!

      user2 = Fabricate(:user)
      topic = Fabricate(:private_message_topic,
        topic_allowed_users: [
          Fabricate.build(:topic_allowed_user, user: user),
          Fabricate.build(:topic_allowed_user, user: user2)
        ],
      )
      Fabricate(:topic_user,
        topic: topic,
        user: user2,
        notification_level: TopicUser.notification_levels[:watching]
      )

      expect {
        PostCreator.create!(user, raw: "", topic_id: topic.id, skip_validations: true)
      }.to change { user2.notifications.count }.by(0)

      expect {
        PostCreator.create!(user, raw: "hello world", topic_id: topic.id, skip_validations: true)
      }.to change { user2.notifications.count }.by(1)
    end
  end

  context 'private message to a user that has disabled private messages' do
    fab!(:another_user) { Fabricate(:user) }

    before do
      another_user.user_option.update!(allow_private_messages: false)
    end

    it 'should not be valid' do
      post_creator = PostCreator.new(
        user,
        title: 'this message is to someone who muted me!',
        raw: "you will have to see this even if you muted me!",
        archetype: Archetype.private_message,
        target_usernames: "#{another_user.username}"
      )

      expect(post_creator).to_not be_valid

      expect(post_creator.errors.full_messages).to include(I18n.t(
        "not_accepting_pms", username: another_user.username
      ))
    end
  end

  context "private message to a muted user" do
    fab!(:muted_me) { Fabricate(:evil_trout) }
    fab!(:another_user) { Fabricate(:user) }

    it 'should fail' do
      updater = UserUpdater.new(muted_me, muted_me)
      updater.update_muted_users("#{user.username}")

      pc = PostCreator.new(
        user,
        title: 'this message is to someone who muted me!',
        raw: "you will have to see this even if you muted me!",
        archetype: Archetype.private_message,
        target_usernames: "#{muted_me.username},#{another_user.username}"
      )

      expect(pc).not_to be_valid

      expect(pc.errors.full_messages).to contain_exactly(
        I18n.t(:not_accepting_pms, username: muted_me.username)
      )
    end

    fab!(:staff_user) { Fabricate(:admin) }

    it 'succeeds if the user is staff' do
      updater = UserUpdater.new(muted_me, muted_me)
      updater.update_muted_users("#{staff_user.username}")

      pc = PostCreator.new(
        staff_user,
        title: 'this message is to someone who muted me!',
        raw: "you will have to see this even if you muted me!",
        archetype: Archetype.private_message,
        target_usernames: "#{muted_me.username}"
      )
      expect(pc).to be_valid
      expect(pc.errors).to be_blank
    end
  end

  context "private message to an ignored user" do
    fab!(:ignorer) { Fabricate(:evil_trout) }
    fab!(:another_user) { Fabricate(:user) }

    context "when post author is ignored" do
      let!(:ignored_user) { Fabricate(:ignored_user, user: ignorer, ignored_user: user) }

      it 'should fail' do
        pc = PostCreator.new(
          user,
          title: 'this message is to someone who ignored me!',
          raw: "you will have to see this even if you ignored me!",
          archetype: Archetype.private_message,
          target_usernames: "#{ignorer.username},#{another_user.username}"
        )

        expect(pc).not_to be_valid
        expect(pc.errors.full_messages).to contain_exactly(
                                             I18n.t(:not_accepting_pms, username: ignorer.username)
                                           )
      end
    end

    context "when post author is admin who is ignored" do
      fab!(:staff_user) { Fabricate(:admin) }
      fab!(:ignored_user) { Fabricate(:ignored_user, user: ignorer, ignored_user: staff_user) }

      it 'succeeds if the user is staff' do
        pc = PostCreator.new(
          staff_user,
          title: 'this message is to someone who ignored me!',
          raw: "you will have to see this even if you ignored me!",
          archetype: Archetype.private_message,
          target_usernames: "#{ignorer.username}"
        )
        expect(pc).to be_valid
        expect(pc.errors).to be_blank
      end
    end

  end

  context "private message recipients limit (max_allowed_message_recipients) reached" do
    fab!(:target_user1) { Fabricate(:coding_horror) }
    fab!(:target_user2) { Fabricate(:evil_trout) }
    fab!(:target_user3) { Fabricate(:walter_white) }

    before do
      SiteSetting.max_allowed_message_recipients = 2
    end

    context "for normal user" do
      it 'fails when sending message to multiple recipients' do
        pc = PostCreator.new(
          user,
          title: 'this message is for multiple recipients!',
          raw: "Lorem ipsum dolor sit amet, id elitr praesent mea, ut ius facilis fierent.",
          archetype: Archetype.private_message,
          target_usernames: [target_user1.username, target_user2.username, target_user3.username].join(',')
        )
        expect(pc).not_to be_valid
        expect(pc.errors).to be_present
      end

      it 'succeeds when sending message to multiple recipients if skip_validations is true' do
        pc = PostCreator.new(
          user,
          title: 'this message is for multiple recipients!',
          raw: "Lorem ipsum dolor sit amet, id elitr praesent mea, ut ius facilis fierent.",
          archetype: Archetype.private_message,
          target_usernames: [target_user1.username, target_user2.username, target_user3.username].join(','),
          skip_validations: true
        )
        expect(pc).to be_valid
        expect(pc.errors).to be_blank
      end
    end

    context "always succeeds if the user is staff" do
      fab!(:staff_user) { Fabricate(:admin) }

      it 'when sending message to multiple recipients' do
        pc = PostCreator.new(
          staff_user,
          title: 'this message is for multiple recipients!',
          raw: "Lorem ipsum dolor sit amet, id elitr praesent mea, ut ius facilis fierent.",
          archetype: Archetype.private_message,
          target_usernames: [target_user1.username, target_user2.username, target_user3.username].join(',')
        )
        expect(pc).to be_valid
        expect(pc.errors).to be_blank
      end
    end
  end

  context "#create_post_notice" do
    fab!(:user) { Fabricate(:user) }
    fab!(:staged) { Fabricate(:staged) }
    fab!(:anonymous) { Fabricate(:anonymous) }

    it "generates post notices for new users" do
      post = PostCreator.create!(user, title: "one of my first topics", raw: "one of my first posts")
      expect(post.custom_fields["notice_type"]).to eq("new_user")

      post = PostCreator.create!(user, title: "another one of my first topics", raw: "another one of my first posts")
      expect(post.custom_fields["notice_type"]).to eq(nil)
    end

    it "generates post notices for returning users" do
      SiteSetting.returning_users_days = 30
      old_post = Fabricate(:post, user: user, created_at: 31.days.ago)

      post = PostCreator.create!(user, title: "this is a returning topic", raw: "this is a post")
      expect(post.custom_fields["notice_type"]).to eq(Post.notices[:returning_user])
      expect(post.custom_fields["notice_args"]).to eq(old_post.created_at.iso8601)

      post = PostCreator.create!(user, title: "this is another topic", raw: "this is my another post")
      expect(post.custom_fields["notice_type"]).to eq(nil)
      expect(post.custom_fields["notice_args"]).to eq(nil)
    end

    it "does not generate for non-human, staged or anonymous users" do
      SiteSetting.allow_anonymous_posting = true

      [anonymous, Discourse.system_user, staged].each do |user|
        expect(user.posts.size).to eq(0)
        post = PostCreator.create!(user, title: "#{user.username}'s first topic", raw: "#{user.name}'s first post")
        expect(post.custom_fields["notice_type"]).to eq(nil)
        expect(post.custom_fields["notice_args"]).to eq(nil)
      end
    end
  end
end