Truncate long richtext descriptions

[rails.git] / lib / rich_text.rb

diff --git a/lib/rich_text.rb b/lib/rich_text.rb
index 83eb235401c6f88cf0a0d6eab46b9ce781dcea2c..03800725ad98cc8af64c561288c4e0ff6269f39a 100644 (file)
--- a/lib/rich_text.rb
+++ b/lib/rich_text.rb
@@ -1,4 +1,10 @@
 module RichText
+  SPAMMY_PHRASES = [
+    "Business Description:", "Additional Keywords:"
+  ].freeze
+
+  MAX_DESCRIPTION_LENGTH = 500
+
   def self.new(format, text)
     case format
     when "html" then HTML.new(text || "")
@@ -11,7 +17,7 @@ module RichText
     include ActionView::Helpers::TextHelper
     include ActionView::Helpers::OutputSafetyHelper
 
-    def sanitize(text)
+    def sanitize(text, _options = {})
       Sanitize.clean(text, Sanitize::Config::OSM).html_safe
     end
   end
@@ -33,10 +39,28 @@ module RichText
           link_size += link.content.length
         end
 
-        link_proportion = link_size.to_f / doc.content.length.to_f
+        link_proportion = link_size.to_f / doc.content.length
       end
 
-      [link_proportion - 0.2, 0.0].max * 200 + link_count * 40
+      spammy_phrases = SPAMMY_PHRASES.count do |phrase|
+        doc.content.include?(phrase)
+      end
+
+      ([link_proportion - 0.2, 0.0].max * 200) +
+        (link_count * 40) +
+        (spammy_phrases * 40)
+    end
+
+    def image
+      nil
+    end
+
+    def image_alt
+      nil
+    end
+
+    def description
+      nil
     end
 
     protected
@@ -45,11 +69,15 @@ module RichText
       SimpleFormat.new.simple_format(text)
     end
 
-    def linkify(text)
+    def sanitize(text)
+      Sanitize.clean(text, Sanitize::Config::OSM).html_safe
+    end
+
+    def linkify(text, mode = :urls)
       if text.html_safe?
-        Rinku.auto_link(text, :urls, tag_options(:rel => "nofollow")).html_safe
+        Rinku.auto_link(text, mode, tag_builder.tag_options(:rel => "nofollow noopener noreferrer")).html_safe
       else
-        Rinku.auto_link(text, :urls, tag_options(:rel => "nofollow"))
+        Rinku.auto_link(text, mode, tag_builder.tag_options(:rel => "nofollow noopener noreferrer"))
       end
     end
   end
@@ -62,29 +90,80 @@ module RichText
     def to_text
       to_s
     end
-
-    private
-
-    def sanitize(text)
-      Sanitize.clean(text, Sanitize::Config::OSM).html_safe
-    end
   end
 
   class Markdown < Base
     def to_html
-      Markdown.html_parser.render(self).html_safe
+      linkify(sanitize(document.to_html), :all)
     end
 
     def to_text
       to_s
     end
 
-    def self.html_renderer
-      @html_renderer ||= Redcarpet::Render::XHTML.new(:filter_html => true, :safe_links_only => true, :link_attributes => { :rel => "nofollow" })
+    def image
+      @image_element = first_image_element(document.root) unless defined? @image_element
+      @image_element.attr["src"] if @image_element
+    end
+
+    def image_alt
+      @image_element = first_image_element(document.root) unless defined? @image_element
+      @image_element.attr["alt"] if @image_element
+    end
+
+    def description
+      @paragraph_element = first_paragraph_element(document.root) unless defined? @paragraph_element
+      truncated_text_content(@paragraph_element) if @paragraph_element
+    end
+
+    private
+
+    def document
+      @document ||= Kramdown::Document.new(self)
+    end
+
+    def first_image_element(element)
+      return element if image?(element) && element.attr["src"].present?
+
+      element.children.find do |child|
+        nested_image = first_image_element(child)
+        break nested_image if nested_image
+      end
+    end
+
+    def first_paragraph_element(element)
+      return element if paragraph?(element)
+
+      element.children.find do |child|
+        nested_paragraph = first_paragraph_element(child)
+        break nested_paragraph if nested_paragraph
+      end
+    end
+
+    def truncated_text_content(element)
+      text = ""
+
+      append_text = lambda do |child|
+        if child.type == :text
+          text << child.value
+        else
+          child.children.each do |c|
+            append_text.call(c)
+            break if text.length > MAX_DESCRIPTION_LENGTH
+          end
+        end
+      end
+      append_text.call(element)
+
+      text.truncate(MAX_DESCRIPTION_LENGTH)
+    end
+
+    def image?(element)
+      element.type == :img || (element.type == :html_element && element.value == "img")
     end
 
-    def self.html_parser
-      @html_parser ||= Redcarpet::Markdown.new(html_renderer, :no_intra_emphasis => true, :autolink => true, :space_after_headers => true)
+    def paragraph?(element)
+      element.type == :p || (element.type == :html_element && element.value == "p")
     end
   end