From 5564275a0b378298dc6281599cbfe71a937109ff Mon Sep 17 00:00:00 2001
From: GitLab Bot <gitlab-bot@gitlab.com>
Date: Thu, 6 Feb 2020 12:10:29 +0000
Subject: Add latest changes from gitlab-org/gitlab@master

---
 config/initializers/mail_encoding_patch.rb | 82 ++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 config/initializers/mail_encoding_patch.rb

(limited to 'config/initializers')

diff --git a/config/initializers/mail_encoding_patch.rb b/config/initializers/mail_encoding_patch.rb
new file mode 100644
index 00000000000..d53b058ba75
--- /dev/null
+++ b/config/initializers/mail_encoding_patch.rb
@@ -0,0 +1,82 @@
+# Monkey patch mail 2.7.1 to fix quoted-printable issues with newlines
+# The issues upstream invalidate SMIME signatures under some conditions
+# This was working properly in 2.6.6
+#
+# See https://gitlab.com/gitlab-org/gitlab/issues/197386
+# See https://github.com/mikel/mail/issues/1190
+
+module Mail
+  module Encodings
+    # PATCH
+    # This reverts https://github.com/mikel/mail/pull/1113, which solves some
+    # encoding issues with binary attachments encoded in quoted-printable, but
+    # unfortunately breaks re-encoding of messages
+    class QuotedPrintable < SevenBit
+      def self.decode(str)
+        ::Mail::Utilities.to_lf str.gsub(/(?:=0D=0A|=0D|=0A)\r\n/, "\r\n").unpack1("M*")
+      end
+
+      def self.encode(str)
+        ::Mail::Utilities.to_crlf([::Mail::Utilities.to_lf(str)].pack("M"))
+      end
+    end
+  end
+
+  class Body
+    def encoded(transfer_encoding = nil, charset = nil)
+      # PATCH
+      # Use provided parameter charset (from parent Message) if not nil,
+      # otherwise use own self.charset
+      # Required because the Message potentially has on its headers the charset
+      # that needs to be used (e.g. 'Content-Type: text/plain; charset=UTF-8')
+      charset = self.charset if charset.nil?
+
+      if multipart?
+        self.sort_parts!
+        encoded_parts = parts.map { |p| p.encoded }
+        ([preamble] + encoded_parts).join(crlf_boundary) + end_boundary + epilogue.to_s
+      else
+        dec = Mail::Encodings.get_encoding(encoding)
+        enc = if Utilities.blank?(transfer_encoding)
+                dec
+              else
+                negotiate_best_encoding(transfer_encoding)
+              end
+
+        if dec.nil?
+          # Cannot decode, so skip normalization
+          raw_source
+        else
+          # Decode then encode to normalize and allow transforming
+          # from base64 to Q-P and vice versa
+          decoded = dec.decode(raw_source)
+
+          if defined?(Encoding) && charset && charset != "US-ASCII"
+            # PATCH
+            # We need to force the encoding: in the case of quoted-printable
+            # this will throw an exception otherwise, because `decoded` will have
+            # an encoding of BINARY (or its equivalent ASCII-8BIT),
+            # coming from QuotedPrintable#decode, and inside it from String#unpack1
+            decoded = decoded.force_encoding(charset)
+            decoded.force_encoding('BINARY') unless Encoding.find(charset).ascii_compatible?
+          end
+
+          enc.encode(decoded)
+        end
+      end
+    end
+  end
+
+  class Message
+    def encoded
+      ready_to_send!
+      buffer = header.encoded
+      buffer << "\r\n"
+      # PATCH
+      # Pass the Message charset down to the contained Body, the headers
+      # potentially contain the charset needed to be applied
+      buffer << body.encoded(content_transfer_encoding, charset)
+      buffer
+    end
+  end
+end
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