/usr/lib/ruby/vendor_ruby/action_mailer/quoting.rb is in ruby-actionmailer-2.3 2.3.14-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module ActionMailer
module Quoting #:nodoc:
# Convert the given text into quoted printable format, with an instruction
# that the text be eventually interpreted in the given charset.
def quoted_printable(text, charset)
text = text.gsub( /[^a-z ]/i ) { quoted_printable_encode($&) }.
gsub( / /, "_" )
"=?#{charset}?Q?#{text}?="
end
# Convert the given character to quoted printable format, taking into
# account multi-byte characters (if executing with $KCODE="u", for instance)
def quoted_printable_encode(character)
result = ""
character.each_byte { |b| result << "=%02X" % b }
result
end
# A quick-and-dirty regexp for determining whether a string contains any
# characters that need escaping.
if !defined?(CHARS_NEEDING_QUOTING)
CHARS_NEEDING_QUOTING = /[\000-\011\013\014\016-\037\177-\377]/
end
# Quote the given text if it contains any "illegal" characters
def quote_if_necessary(text, charset)
text = text.dup.force_encoding(Encoding::ASCII_8BIT) if text.respond_to?(:force_encoding)
(text =~ CHARS_NEEDING_QUOTING) ?
quoted_printable(text, charset) :
text
end
# Quote any of the given strings if they contain any "illegal" characters
def quote_any_if_necessary(charset, *args)
args.map { |v| quote_if_necessary(v, charset) }
end
# Quote the given address if it needs to be. The address may be a
# regular email address, or it can be a phrase followed by an address in
# brackets. The phrase is the only part that will be quoted, and only if
# it needs to be. This allows extended characters to be used in the
# "to", "from", "cc", "bcc" and "reply-to" headers.
def quote_address_if_necessary(address, charset)
if Array === address
address.map { |a| quote_address_if_necessary(a, charset) }
elsif address =~ /^(\S.*)\s+(<.*>)$/
address = $2
phrase = quote_if_necessary($1.gsub(/^['"](.*)['"]$/, '\1'), charset)
"\"#{phrase}\" #{address}"
else
address
end
end
# Quote any of the given addresses, if they need to be.
def quote_any_address_if_necessary(charset, *args)
args.map { |v| quote_address_if_necessary(v, charset) }
end
end
end
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