Added support of html emails.

app/models/channel/email_build.rb

@@ -4,6 +4,17 @@ require 'mail'
 
 class Channel::EmailBuild
 
+=begin
+
+  backend = Channel::EmailBuild.new
+  mail = backend.send(
+    :from => 'sender@example.com',
+    :to   => 'recipient@example.com',
+    :body => 'somebody with some text',
+  )
+
+=end
+
   def build(attr, notification = false)
     mail = Mail.new
 
@@ -20,18 +31,31 @@ class Channel::EmailBuild
       attr['Auto-Submitted'] = 'auto-generated'
     end
 
-    attr['X-Powered-BY'] = 'OTRS - Open Ticket Request System (http://otrs.org/)'
-    attr['X-Mailer'] = 'OTRS Mail Service (3.x)'
+    #attr['X-Powered-BY'] = 'Zammad - Support/Helpdesk (http://www.zammad.org/)'
+    attr['X-Mailer'] = 'Zammad Mail Service (1.x)'
 
     # set headers
-    attr.each do |key, v|
-      if key.to_s != 'attachments' && key.to_s != 'body'
-        mail[key.to_s] = v.to_s
-      end
+    attr.each do |key, value|
+      next if key.to_s == 'attachments'
+      next if key.to_s == 'body'
+      next if key.to_s == 'content_type'
+      mail[key.to_s] = value.to_s
     end
 
-    # add body
+    # add html part
+    if attr[:content_type] && attr[:content_type] == 'text/html'
+      mail.html_part = Mail::Part.new do
+        content_type 'text/html; charset=UTF-8'
+        body attr[:body]
+      end
+
+      # generate plain part
+      attr[:body] = html2text( attr[:body] )
+    end
+
+    # add plain text part
     mail.text_part = Mail::Part.new do
+      content_type 'text/plain; charset=UTF-8'
       body attr[:body]
     end
 
@@ -47,4 +71,38 @@ class Channel::EmailBuild
     end
     mail
   end
+
+  private
+
+    # from https://gist.github.com/petrblaho/657856
+    def html2text(html)
+      text = html.
+        gsub(/( |\n|\s)+/im, ' ').squeeze(' ').strip.
+        gsub(/<([^\s]+)[^>]*(src|href)=\s*(.?)([^>\s]*)\3[^>]*>\4<\/\1>/i, '\4')
+
+      links = []
+      linkregex = /<[^>]*(src|href)=\s*(.?)([^>\s]*)\2[^>]*>\s*/i
+      while linkregex.match(text)
+        links << $~[3]
+        text.sub!(linkregex, "[#{links.size}]")
+      end
+
+      text = CGI.unescapeHTML(
+        text.
+          gsub(/<(script|style)[^>]*>.*<\/\1>/im, '').
+          gsub(/<!--.*-->/m, '').
+          gsub(/<hr(| [^>]*)>/i, "___\n").
+          gsub(/<li(| [^>]*)>/i, "\n* ").
+          gsub(/<blockquote(| [^>]*)>/i, '> ').
+          gsub(/<(br)(| [^>]*)>/i, "\n").
+          gsub(/<(\/h[\d]+|p)(| [^>]*)>/i, "\n\n").
+          gsub(/<[^>]*>/, '')
+      ).lstrip.gsub(/\n[ ]+/, "\n") + "\n"
+
+      for i in (0...links.size).to_a
+        text = text + "\n  [#{i+1}] <#{CGI.unescapeHTML(links[i])}>" unless links[i].nil?
+      end
+      links = nil
+      text
+    end
 end

app/models/observer/ticket/article/communicate_email/background_job.rb

@@ -19,6 +19,7 @@ class Observer::Ticket::Article::CommunicateEmail::BackgroundJob
         :to           => record.to,
         :cc           => record.cc,
         :subject      => subject,
+        :content_type => record.content_type,
         :body         => record.body,
         :attachments  => record.attachments
       }