Better handle html-only emails (#16962).

git-svn-id: http://svn.redmine.org/redmine/trunk@14313 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/wiki_formatting/html_parser.rb

@@ -0,0 +1,54 @@
+# Redmine - project management software
+# Copyright (C) 2006-2015  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+require 'loofah/helpers'
+
+module Redmine
+  module WikiFormatting
+    class HtmlParser
+
+      class_attribute :tags
+      self.tags = {
+        'br' => {:post => "\n"}
+      }
+
+      def self.to_text(html)
+        html = html.gsub(/[\n\r]/, '').squeeze(' ')
+    
+        doc = Loofah.document(html)
+        doc.scrub!(WikiTags.new(tags))
+        doc.scrub!(:newline_block_elements)
+    
+        Loofah::Helpers.remove_extraneous_whitespace(doc.text).strip
+      end
+
+      class WikiTags < ::Loofah::Scrubber
+        def initialize(tags_to_text)
+          @direction = :bottom_up
+          @tags_to_text = tags_to_text || {}
+        end
+    
+        def scrub(node)
+          formatting = @tags_to_text[node.name]
+          return CONTINUE unless formatting
+          node.add_next_sibling Nokogiri::XML::Text.new("#{formatting[:pre]}#{node.content}#{formatting[:post]}", node.document)
+          node.remove
+        end
+      end
+    end
+  end
+end