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@madwork
Last active Aug 29, 2015
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Utf8 Sanitizer Middleware
# Utf8Sanitizer
# Rack/Ruby on Rails: ArgumentError: invalid byte sequence in UTF-8
# raise 400 error
# http://dev.mensfeld.pl/2014/03/rack-argument-error-invalid-byte-sequence-in-utf-8/
class Utf8Sanitizer
SANITIZE_ENV_KEYS = %w(
HTTP_REFERER
PATH_INFO
REQUEST_URI
REQUEST_PATH
QUERY_STRING
)
def initialize(app)
@app = app
end
def call(env)
SANITIZE_ENV_KEYS.each do |key|
string = env[key].to_s
valid = URI.decode(string).force_encoding('UTF-8').valid_encoding?
# Don't accept requests with invalid byte sequence
return [ 400, { }, [ 'Bad request' ] ] unless valid
end
@app.call(env)
end
end
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