Issue subject may be broken if the subject field is split into multiple lines (#31365).

Patch by Yuichi HARADA.

git-svn-id: http://svn.redmine.org/redmine/trunk@18245 e93f8b46-1217-0410-a6f0-8f06a7374b81

3 files changed, 34 insertions, 0 deletions

diff --git a/config/initializers/10-patches.rb b/config/initializers/10-patches.rb
index e0559903b..06edc943a 100644
--- a/config/initializers/10-patches.rb
+++ b/config/initializers/10-patches.rb
@@ -107,6 +107,20 @@ end
 
 require 'mail'
 
+module Mail
+  class SubjectField
+    # Fixed that the issue subject may be broken if the subject field in the
+    # receiving email is split into multiple lines
+    def initialize(value = nil, charset = 'utf-8')
+      if mime_encode = /^(=\?\S+\?\S\?)/.match(value).to_a[1]
+        value.gsub!(/\?=\s+#{Regexp.escape(mime_encode)}/, '')
+      end
+      self.charset = charset
+      super(CAPITALIZED_FIELD, value, charset)
+    end
+  end
+end
+
 module DeliveryMethods
   class TmpFile
     def initialize(*args); end
diff --git a/test/fixtures/mail_handler/ticket_with_split_bytes_subject.eml b/test/fixtures/mail_handler/ticket_with_split_bytes_subject.eml
new file mode 100644
index 000000000..52b8099e9
--- /dev/null
+++ b/test/fixtures/mail_handler/ticket_with_split_bytes_subject.eml
@@ -0,0 +1,9 @@
+Date: Mon, 13 May 2019 13:39:29 +0900
+Message-ID: <CALXUZfgwpW-hizEabSAjjkykQGV6-V6bwKu693Cr7cDH6DR7pQ@mail.gmail.com>
+Subject: =?utf-8?B?zrHOss6zzrTOtc62zrfOuM65zrrOu868zr3Ovs6/z4DPgc+Cz4PPhM+Fz4bP?=
+        =?utf-8?B?h8+Iz4k=?=
+From: <foo@example.com>
+To: <baz@example.com>
+Content-Type: text/plain
+
+Split bytes subject.
diff --git a/test/unit/mail_handler_test.rb b/test/unit/mail_handler_test.rb
index 469722a37..ed064f6f7 100644
--- a/test/unit/mail_handler_test.rb
+++ b/test/unit/mail_handler_test.rb
@@ -1147,6 +1147,17 @@ class MailHandlerTest < ActiveSupport::TestCase
     assert_equal issue.subject, 'New ticket on a given project with a very long subject line which exceeds 255 chars and should not be ignored but chopped off. And if the subject line is still not long enough, we just add more text. And more text. Wow, this is really annoying. Especially, if you have nothing to say...'[0,255]
   end
 
+  def test_email_with_split_bytes_subject
+    issue = submit_email(
+              'ticket_with_split_bytes_subject.eml',
+              :issue => {:project => 'ecookbook'},
+              :no_permission_check => '1',
+              :unknown_user => 'accept'
+            )
+    assert issue.is_a?(Issue)
+    assert_equal 'αβγδεζηθικλμνξοπρςστυφχψω', issue.subject
+  end
+
   def test_first_keyword_should_be_matched
     issue = submit_email('ticket_with_duplicate_keyword.eml', :allow_override => 'priority')
     assert issue.is_a?(Issue)