Merge branch 'bugfix/html-only-mail' into 'master'

add parsing support for incoming html email ## What does this MR do? Fixes #18388 by adding support for parsing HTML email ## Are there points in the code the reviewer needs to double check? The new class, Gitlab::Email::HTMLParser, which needs to translate the HTML content to text and also delete replies, as they are not necessarily in the correct format to be caught by EmailReplyParser. The solution I found that should work for any HTML-formatted email is to remove all `<table>` and `<blockquote>` tags. Actual `<table>` elements (to be interpreted by markdown) should already be encoded with e.g. `<table>` - the only failure mode is if there is an *actual* HTML table in the content itself, which we wouldn't be able to support easily anyways. The gem `html2text` traverses the HTML tree and outputs text - and markdown in the case of HTML links or images. See merge request !7397

Merge branch 'bugfix/html-only-mail' into 'master'
add parsing support for incoming html email ## What does this MR do? Fixes #18388 by adding support for parsing HTML email ## Are there points in the code the reviewer needs to double check? The new class, Gitlab::Email::HTMLParser, which needs to translate the HTML content to text and also delete replies, as they are not necessarily in the correct format to be caught by EmailReplyParser. The solution I found that should work for any HTML-formatted email is to remove all `<table>` and `<blockquote>` tags. Actual `<table>` elements (to be interpreted by markdown) should already be encoded with e.g. `<table>` - the only failure mode is if there is an *actual* HTML table in the content itself, which we wouldn't be able to support easily anyways. The gem `html2text` traverses the HTML tree and outputs text - and markdown in the case of HTML links or images. See merge request !7397
2717675f · Douwe Maan · 88479f7f · e1b86830 · 2717675f · 2717675f
Commit 2717675f authored Nov 18, 2016 by Douwe Maan
7 changed files
--- a/Gemfile
+++ b/Gemfile
@@ -330,6 +330,7 @@ gem 'octokit', '~> 4.3.0'
 gem 'mail_room', '~> 0.9.0'

 gem 'email_reply_parser', '~> 0.5.8'
+gem 'html2text'

 gem 'ruby-prof', '~> 0.16.2'


--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -339,6 +339,8 @@ GEM
    html-pipeline (1.11.0)
      activesupport (>= 2)
      nokogiri (~> 1.4)
+    html2text (0.2.0)
+      nokogiri (~> 1.6)
    htmlentities (4.3.4)
    httparty (0.13.7)
      json (~> 1.8)
@@ -873,6 +875,7 @@ DEPENDENCIES
  health_check (~> 2.2.0)
  hipchat (~> 1.5.0)
  html-pipeline (~> 1.11.0)
+  html2text
  httparty (~> 0.13.3)
  influxdb (~> 0.2)
  jira-ruby (~> 1.1.2)

--- a/changelogs/unreleased/bugfix-html-only-mail.yml
+++ b/changelogs/unreleased/bugfix-html-only-mail.yml
+---
+title: Add support for reply-by-email when the email only contains HTML
+merge_request: 7397
+author:
--- a/lib/gitlab/email/html_parser.rb
+++ b/lib/gitlab/email/html_parser.rb
+module Gitlab
+  module Email
+    class HTMLParser
+      def self.parse_reply(raw_body)
+        new(raw_body).filtered_text
+      end
+
+      attr_reader :raw_body
+      def initialize(raw_body)
+        @raw_body = raw_body
+      end
+
+      def document
+        @document ||= Nokogiri::HTML.parse(raw_body)
+      end
+
+      def filter_replies!
+        document.xpath('//blockquote').each(&:remove)
+        document.xpath('//table').each(&:remove)
+      end
+
+      def filtered_html
+        @filtered_html ||= begin
+          filter_replies!
+          document.inner_html
+        end
+      end
+
+      def filtered_text
+        @filtered_text ||= Html2Text.convert(filtered_html)
+      end
+    end
+  end
+end
--- a/lib/gitlab/email/reply_parser.rb
+++ b/lib/gitlab/email/reply_parser.rb
@@ -23,19 +23,26 @@ module Gitlab
      private

      def select_body(message)
-        text    = message.text_part if message.multipart?
-        text  ||= message           if message.content_type !~ /text\/html/
+        if message.multipart?
+          part = message.text_part || message.html_part || message
+        else
+          part = message
+        end

-        return "" unless text
+        decoded = fix_charset(part)

-        text = fix_charset(text)
+        return "" unless decoded

        # Certain trigger phrases that means we didn't parse correctly
-        if text =~ /(Content\-Type\:|multipart\/alternative|text\/plain)/
+        if decoded =~ /(Content\-Type\:|multipart\/alternative|text\/plain)/
          return ""
        end

-        text
+        if (part.content_type || '').include? 'text/html'
+          HTMLParser.parse_reply(decoded)
+        else
+          decoded
+        end
      end

      # Force encoding to UTF-8 on a Mail::Message or Mail::Part

--- a/spec/fixtures/emails/outlook_html.eml
+++ b/spec/fixtures/emails/outlook_html.eml
+
+MIME-Version: 1.0
+Received: by 10.25.161.144 with HTTP; Tue, 7 Oct 2014 22:17:17 -0700 (PDT)
+X-Originating-IP: [117.207.85.84]
+In-Reply-To: <5434c8b52bb3a_623ff09fec70f049749@discourse-app.mail>
+References: <topic/35@discourse.techapj.com>
+  <5434c8b52bb3a_623ff09fec70f049749@discourse-app.mail>
+Date: Wed, 8 Oct 2014 10:47:17 +0530
+Delivered-To: arpit@techapj.com
+Message-ID: <CAOJeqne=SJ_LwN4sb-0Y95ejc2OpreVhdmcPn0TnmwSvTCYzzQ@mail.gmail.com>
+Subject: Re: [Discourse] [Meta] Welcome to techAPJ's Discourse!
+From: Arpit Jalan <arpit@techapj.com>
+To: Discourse <mail+e1c7f2a380e33840aeb654f075490bad@arpitjalan.com>Accept-Language: en-US
+Content-Language: en-US
+X-MS-Has-Attach:
+X-MS-TNEF-Correlator:
+x-originating-ip: [134.68.31.227]
+Content-Type: multipart/alternative;
+        boundary="_000_B0DFE1BEB3739743BC9B639D0E6BC8FF217A6341IUMSSGMBX104ads_"
+MIME-Version: 1.0
+
+--_000_B0DFE1BEB3739743BC9B639D0E6BC8FF217A6341IUMSSGMBX104ads_
+Content-Type: text/html; charset="utf-8"
+Content-Transfer-Encoding: base64
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+
+--_000_B0DFE1BEB3739743BC9B639D0E6BC8FF217A6341IUMSSGMBX104ads_--
--- a/spec/lib/gitlab/email/reply_parser_spec.rb
+++ b/spec/lib/gitlab/email/reply_parser_spec.rb
@@ -206,5 +206,9 @@ describe Gitlab::Email::ReplyParser, lib: true do
    it "properly renders email reply from MS Outlook client" do
      expect(test_parse_body(fixture_file("emails/outlook.eml"))).to eq("Microsoft Outlook 2010")
    end
+
+    it "properly renders html-only email from MS Outlook" do
+      expect(test_parse_body(fixture_file("emails/outlook_html.eml"))).to eq("Microsoft Outlook 2010")
+    end
  end
 end