64 lines
2.2 KiB
Ruby
64 lines
2.2 KiB
Ruby
module Gitlab
|
|
module Git
|
|
module EncodingHelper
|
|
extend self
|
|
|
|
# This threshold is carefully tweaked to prevent usage of encodings detected
|
|
# by CharlockHolmes with low confidence. If CharlockHolmes confidence is low,
|
|
# we're better off sticking with utf8 encoding.
|
|
# Reason: git diff can return strings with invalid utf8 byte sequences if it
|
|
# truncates a diff in the middle of a multibyte character. In this case
|
|
# CharlockHolmes will try to guess the encoding and will likely suggest an
|
|
# obscure encoding with low confidence.
|
|
# There is a lot more info with this merge request:
|
|
# https://gitlab.com/gitlab-org/gitlab_git/merge_requests/77#note_4754193
|
|
ENCODING_CONFIDENCE_THRESHOLD = 40
|
|
|
|
def encode!(message)
|
|
return nil unless message.respond_to? :force_encoding
|
|
|
|
# if message is utf-8 encoding, just return it
|
|
message.force_encoding("UTF-8")
|
|
return message if message.valid_encoding?
|
|
|
|
# return message if message type is binary
|
|
detect = CharlockHolmes::EncodingDetector.detect(message)
|
|
return message.force_encoding("BINARY") if detect && detect[:type] == :binary
|
|
|
|
# force detected encoding if we have sufficient confidence.
|
|
if detect && detect[:encoding] && detect[:confidence] > ENCODING_CONFIDENCE_THRESHOLD
|
|
message.force_encoding(detect[:encoding])
|
|
end
|
|
|
|
# encode and clean the bad chars
|
|
message.replace clean(message)
|
|
rescue
|
|
encoding = detect ? detect[:encoding] : "unknown"
|
|
"--broken encoding: #{encoding}"
|
|
end
|
|
|
|
def encode_utf8(message)
|
|
detect = CharlockHolmes::EncodingDetector.detect(message)
|
|
if detect
|
|
begin
|
|
CharlockHolmes::Converter.convert(message, detect[:encoding], 'UTF-8')
|
|
rescue ArgumentError => e
|
|
Rails.logger.warn("Ignoring error converting #{detect[:encoding]} into UTF8: #{e.message}")
|
|
|
|
''
|
|
end
|
|
else
|
|
clean(message)
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def clean(message)
|
|
message.encode("UTF-16BE", undef: :replace, invalid: :replace, replace: "")
|
|
.encode("UTF-8")
|
|
.gsub("\0".encode("UTF-8"), "")
|
|
end
|
|
end
|
|
end
|
|
end
|