First stab at oneboxing of meta.discourse.org

app/helpers/application_helper.rb

@@ -36,7 +36,7 @@ module ApplicationHelper
   def crawlable_meta_data(opts=nil)
 
     opts ||= {}
-    opts[:image] ||= "#{Discourse.base_url}#{SiteSetting.logo_url}"
+    opts[:image] ||= "#{Discourse.base_url}#{SiteSetting.logo_small_url}"
     opts[:url] ||= "#{Discourse.base_url}#{request.fullpath}"
 
     # Add opengraph tags
@@ -45,8 +45,8 @@ module ApplicationHelper
     result << tag(:meta, property: 'twitter:card', content: "summary")
     [:image, :url, :title, :description].each do |property|
       if opts[property].present?
-        result << tag(:meta, property: "og:#{property}", content: opts[property]) << "\n"
-        result << tag(:meta, property: "twitter:#{property}", content: opts[property]) << "\n"
+        result << tag(:meta, {property: "og:#{property}", content: opts[property]}, nil, false) << "\n"
+        result << tag(:meta, {property: "twitter:#{property}", content: opts[property]}, nil, false) << "\n"
       end
     end
 

app/models/user.rb

@@ -320,6 +320,11 @@ class User < ActiveRecord::Base
     "https://www.gravatar.com/avatar/#{email_hash}.png?s={size}&r=pg&d=identicon"
   end
 
+  # Don't pass this up to the client - it's meant for server side use
+  def small_avatar_url
+    "https://www.gravatar.com/avatar/#{email_hash}.png?s=50&r=pg&d=identicon"
+  end
+
   # return null for local avatars, a template for gravatar
   def avatar_template
     User.avatar_template(email)

app/views/topics/show.html.erb

@@ -24,5 +24,7 @@
 
 <% content_for :head do %>
   <%= auto_discovery_link_tag(@topic_view, {action: :feed, format: :rss}, title: t('rss_posts_in_topic', topic: @topic_view.title), type: 'application/rss+xml') %>
-  <%= crawlable_meta_data(title: @topic_view.title, description: @topic_view.summary) %>
+  <%= crawlable_meta_data(title: @topic_view.title,
+                          description: @topic_view.summary,
+                          image: @topic_view.image_url) %>
 <% end %>

app/views/users/show.html.erb

@@ -5,5 +5,5 @@
 <p><%= t 'powered_by_html' %></p>
 
 <% content_for :head do %>
-  <%= crawlable_meta_data(title: @user.username, description: @user.bio_summary) %>
+  <%= crawlable_meta_data(title: @user.username, description: @user.bio_summary, image: @user.small_avatar_url) %>
 <% end %>

lib/oneboxer/discourse_local_onebox.rb

@@ -2,7 +2,7 @@ require_dependency 'oneboxer/oembed_onebox'
 require_dependency 'freedom_patches/rails4'
 
 module Oneboxer
-  class DiscourseOnebox < BaseOnebox
+  class DiscourseLocalOnebox < BaseOnebox
     include ActionView::Helpers::DateHelper
 
     matcher do

lib/oneboxer/discourse_remote_onebox.rb

@@ -0,0 +1,22 @@
+require_dependency 'oneboxer/oembed_onebox'
+require_dependency 'freedom_patches/rails4'
+
+module Oneboxer
+  class DiscourseRemoteOnebox < HandlebarsOnebox
+
+    matcher /^https?\:\/\/meta\.discourse\.org\/.*$/
+    favicon 'discourse.png'
+
+    def template
+      template_path('simple_onebox')
+    end
+
+    def parse(data)
+      doc = Nokogiri::HTML(data)
+      open_graph = Oneboxer.parse_open_graph(doc)
+      open_graph['text'] = open_graph['description']
+      open_graph
+    end
+
+  end
+end

lib/topic_view.rb

@@ -79,6 +79,11 @@ class TopicView
     Summarize.new(posts.first.cooked).summary
   end
 
+  def image_url
+    return nil if posts.blank?
+    posts.first.user.small_avatar_url
+  end
+
   def filter_posts(opts = {})
     if opts[:post_number].present?
       # Get posts near a post