discourse/app/views/topics/show.html.erb

<% if @topic_view %>
  <div id="topic-title">
    <h1>
      <%= render_topic_title(@topic_view.topic) %>
    </h1>

    <% if @breadcrumbs.present? %>
      <div class="topic-category" itemscope itemtype="http://schema.org/BreadcrumbList">
        <% @breadcrumbs.each_with_index do |c, i| %>
          <span itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem">
            <a href="<%= c[:url] %>" class="badge-wrapper bullet" itemprop="item">
              <span class='badge-category-bg' style='background-color: #<%= c[:color] %>'></span>
              <span class='badge-category clear-badge'>
                <span class='category-name' itemprop='name'><%= c[:name] %></span>
              </span>
            </a>
            <meta itemprop="position" content="<%= i + 1 %>" />
          </span>
        <% end %>
      </div>
    <% end %>

    <% if @tags.present? %>
      <div class="topic-category">
        <div class='discourse-tags list-tags'>
          <% @tags.each_with_index do |tag, i| %>
            <a href='<%= "#{Discourse.base_url}/tag/#{tag.name}" %>' class='discourse-tag' rel="tag"><%= tag.name -%></a><% if i < @tags.size - 1 %>, <% end %>
          <% end %>
        </div>
      </div>
    <% end %>
  </div>

  <%= server_plugin_outlet "topic_header" %>

  <%- if include_crawler_content? %>
    <% main_entity_schema = crawler_topic_main_entity_schema(@topic_view.topic) %>
    <div <%= crawler_topic_container_schema(@topic_view.topic) %>>
      <meta itemprop='<%= main_entity_schema ? "name" : "headline" %>' content='<%= @topic_view.title %>'>
      <link itemprop='url' href='<%= @topic_view.absolute_url %>'>
      <meta itemprop='datePublished' content='<%= @topic_view.topic.created_at.to_formatted_s(:iso8601) %>'>
      <meta itemprop='keywords' content='<%= @tags.map(&:name).join(', ') %>'>
      <% unless main_entity_schema %>
        <% if @topic_view.topic.category.present? %>
          <meta itemprop='articleSection' content='<%= @topic_view.topic.category.name %>'>
        <% end %>
        <div itemprop='publisher' itemscope itemtype="http://schema.org/Organization">
          <meta itemprop='name' content='<%= SiteSetting.company_name.presence || SiteSetting.title %>'>
          <% if application_logo_url.present? %>
            <div itemprop='logo' itemscope itemtype="http://schema.org/ImageObject">
              <meta itemprop='url' content='<%= application_logo_url %>'>
            </div>
          <% end %>
        </div>
      <% end %>

      <% if main_entity_schema %>
        <div <%= main_entity_schema %>>
          <%= build_plugin_html 'server:topic-main-entity-meta-crawler' %>
      <% end %>

      <% if @topic_view.crawler_posts&.first && !@topic_view.crawler_posts.first.is_first_post? %>
        <% if @topic_view.topic.user.present? %>
          <span itemprop='author' itemscope itemtype="http://schema.org/Person">
            <meta itemprop='name' content='<%= @topic_view.topic.user.username %>'>
            <link itemprop='url' rel='nofollow' href='<%= Discourse.base_url %>/u/<%= @topic_view.topic.user.username %>'>
          </span>
        <% end %>
        <meta itemprop='text' content='<%= @topic_view.topic.plain_text_excerpt %>'>
      <% end %>

      <% @topic_view.crawler_posts.each do |post| %>
        <% next if crawler_post_schema_skip?(post, @topic_view.topic) %>
        <% if (u = post.user) && !post.hidden && post.cooked && !post.cooked.strip.empty? %>
          <% emit_md = crawler_post_emits_microdata?(post, @topic_view.topic) %>
          <div id='post_<%= post.post_number %>' <%= crawler_post_schema(post, @topic_view.topic) %> class='topic-body crawler-post'>
            <div class='crawler-post-meta'>
              <span class="creator" <%= tag.attributes(itemprop: "author", itemscope: true, itemtype: "http://schema.org/Person") if emit_md %>>
                <a rel='nofollow' href='<%= Discourse.base_url %>/u/<%= u.username %>'><span <%= tag.attributes(itemprop: "name") if emit_md %>><%= u.username %></span></a>
                <% if emit_md %>
                  <meta itemprop='url' content='<%= Discourse.base_url %>/u/<%= u.username %>'>
                <% end %>
                <%= "(#{u.name})" if (SiteSetting.display_name_on_posts && SiteSetting.enable_names? && !u.name.blank?) %>
                <%
                  post_custom_fields = @topic_view.post_custom_fields[post.id] || {}
                  who_username = post_custom_fields["action_code_who"] || ""
                  small_action_href = post_custom_fields["action_code_path"] || ""
                  if post.action_code
                %>
                  <%= t("js.action_codes.#{post.action_code}", when: "", who: who_username, href: small_action_href).html_safe %>
                <% end %>
              </span>

              <% if post.is_first_post? && !main_entity_schema %>
                <link itemprop="mainEntityOfPage" href="<%= post.topic.url %>">
              <% end %>

              <% if post.image_url && emit_md %>
                <link itemprop="image" href="<%= post.image_url %>">
              <% end %>

              <span class="crawler-post-infos">
                  <time <%= tag.attributes(itemprop: "datePublished") if emit_md && !post.is_first_post? %> datetime='<%= post.created_at.to_formatted_s(:iso8601) %>' class='post-time'>
                    <%= l post.created_at, format: :long %>
                  </time>
                <% if emit_md %>
                  <% modified_at = post.version > 1 ? post.last_version_at : post.created_at %>
                  <meta itemprop='dateModified' content='<%= modified_at.to_formatted_s(:iso8601) %>'>
                <% end %>
              <span <%= tag.attributes(itemprop: "position") if emit_md %>><%= post.post_number %></span>
              </span>
            </div>
            <div class='post' <%= tag.attributes(itemprop: "text") if emit_md %>>
              <%= post.hidden ? t('flagging.user_must_edit').html_safe : post.cooked.html_safe %>
            </div>

            <% unless crawler_post_schema_overridden?(post, @topic_view.topic) %>
              <div <%= tag.attributes(itemprop: "interactionStatistic", itemscope: true, itemtype: "http://schema.org/InteractionCounter") if emit_md %>>
                <% if emit_md %>
                  <meta itemprop="interactionType" content="http://schema.org/LikeAction"/>
                  <meta itemprop="userInteractionCount" content="<%= post.like_count %>" />
                <% end %>
                <span class='post-likes'><%= post.like_count > 0 ? t('post.has_likes', count: post.like_count) : '' %></span>
              </div>
            <% end %>

              <% if (linkbacks = @topic_view.linkbacks_for(post)).present? %>
                <div class='crawler-linkback-list'>
                  <% linkbacks.each do |link| %>
                    <div>
                      <a href="<%=link[:url]%>"><%=link[:title]%></a>
                    </div>
                  <% end %>
                </div>
              <% end %>

            <%= build_plugin_html "server:topic-show-crawler-post-end", post: post %>
          </div>
        <% end %>
      <% end %>

      <% if main_entity_schema %>
        </div>
      <% end %>
    </div>

    <% if @topic_view.single_post_request? || @topic_view.prev_page || @topic_view.next_page %>
      <div role='navigation' itemscope itemtype='http://schema.org/SiteNavigationElement' class="topic-body crawler-post">
        <% if @topic_view.single_post_request? %>
          <span itemprop='name'>
            <%= link_to t(:show_post_in_topic), "#{@topic_view.current_page_path}#post_#{@topic_view.crawler_posts.first&.post_number}", itemprop: 'url' %>
          </span>
        <% else %>
          <% if @topic_view.prev_page %>
            <span itemprop='name'><%= link_to t(:prev_page), @topic_view.prev_page_path, rel: 'prev', itemprop: 'url' %></span>
          <% end %>
          <% if @topic_view.next_page %>
            <span itemprop='name'><b><%= link_to t(:next_page), @topic_view.next_page_path, rel: 'next', itemprop: 'url' %></b></span>
          <% end %>
        <% end %>
      </div>
    <% end %>

    <%= build_plugin_html 'server:topic-show-after-posts-crawler' %>
  <% else %>
    <%= t(:crawler_content_hidden) %>
  <% end %>

  <% content_for :head do %>
    <%= auto_discovery_link_tag(@topic_view, {action: :feed, slug: @topic_view.topic.slug, topic_id: @topic_view.topic.id}, rel: 'alternate nofollow', title: t('rss_posts_in_topic', topic: @topic_view.title), type: 'application/rss+xml') %>
    <%= raw crawlable_meta_data(
      title: @topic_view.title,
      description: @topic_view.summary(strip_images: true),
      image: @topic_view.image_url,
      image_width: @topic_view.image_width,
      image_height: @topic_view.image_height,
      image_type: @topic_view.image_type,
      read_time: @topic_view.read_time,
      like_count: @topic_view.like_count,
      ignore_canonical: true,
      published_time: @topic_view.published_time,
      breadcrumbs: @breadcrumbs,
      tags: @tags.map(&:name),
    ) %>

    <% if !@topic_view.single_post_request? && (@topic_view.prev_page || @topic_view.next_page)  %>
      <% if @topic_view.prev_page %>
        <link rel="prev" href="<%= @topic_view.prev_page_path -%>">
      <% end %>
      <% if @topic_view.next_page %>
        <link rel="next" href="<%= @topic_view.next_page_path -%>">
      <% end %>
    <% end %>
  <% end %>

  <% content_for(:title) { @title || "#{gsub_emoji_to_unicode(@topic_view.page_title)} - #{SiteSetting.title}" } %>

  <% if @topic_view.print %>
    <% content_for :after_body do %>
        <%= preload_script('js/print-page') %>
    <% end %>
  <% end %>
<% end %>