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module Gitlab
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
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