added meta tag mechanism for facebook

app/controllers/pages_controller.rb

@@ -34,6 +34,8 @@ class PagesController < ApplicationController
     params[:is_frontend_view] = "true"
     OrbitHelper.set_params params,current_user
     OrbitHelper.set_site_locale locale
+    OrbitHelper.set_request_object request
+    OrbitHelper.render_meta_tags []
     render :html => render_final_page("home",page,true).html_safe
   end
 
@@ -102,6 +104,7 @@ class PagesController < ApplicationController
           end
           @manifest = @key
           OrbitHelper.set_params params,current_user
+          OrbitHelper.set_request_object request
           OrbitHelper.set_site_locale locale
           OrbitHelper.set_this_module_app module_app.singularize
           OrbitHelper.set_page_categories categories || ["all"]
@@ -396,6 +399,7 @@ class PagesController < ApplicationController
             OrbitHelper.set_widget_data_count subpart.data_count
             OrbitHelper.set_widget_module_app subpart.module
             OrbitHelper.set_widget_item_url subpart
+            OrbitHelper.render_meta_tags []
             OrbitHelper.set_widget_title subpart.title
             OrbitHelper.set_widget_categories subpart.categories || ["all"]
             OrbitHelper.set_widget_tags subpart.tags || []
@@ -464,6 +468,7 @@ class PagesController < ApplicationController
       if original_view != "home"
         viewarea = doc.css("*[data-content='true']")[0]
         viewarea.inner_html = render_to_string(original_view) rescue "<div></div>"
+        head[0].inner_html = OrbitHelper.meta_tags_html + head.inner_html
       end
       link = doc.css("link")[0]
       link.attributes["href"].value = current_site.favicon.url.nil? ? "/assets/favicon.ico" : current_site.favicon.url

app/helpers/orbit_helper.rb

@@ -267,6 +267,14 @@ module OrbitHelper
     "#{request.host_with_port}/#{locale}#{url}"
   end
 
+  def self.set_request_object(request)
+    @site_request_object = request
+  end
+
+  def self.request
+    @site_request_object
+  end
+
   def self.set_site_locale(locale)
     @site_locale = locale
   end
@@ -351,6 +359,28 @@ module OrbitHelper
     return css_html
   end
 
+  def self.render_meta_tags(metas=[])
+    @page_meta_tags = metas
+  end
+
+  def self.meta_tags_html
+    html = ""
+    if !@page_meta_tags.nil?
+      @page_meta_tags.each do |meta|
+        html = html + "<meta "
+        meta.keys.each do |attrib|
+          html = html + "#{attrib}='#{self.strip_html_tags(meta[attrib])}' "
+        end
+        html = html + ">"
+      end
+    end
+    html
+  end
+
+  def self.strip_html_tags(string)
+    ActionView::Base.full_sanitizer.sanitize(string)
+  end
+
   # ===============================================================  
   # Breadcrumbs
   # ===============================================================