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# frozen_string_literal: true
module Net
class IMAP < Protocol
# Decode a string from modified UTF-7 format to UTF-8.
#
# UTF-7 is a 7-bit encoding of Unicode [UTF7]. IMAP uses a
# slightly modified version of this to encode mailbox names
# containing non-ASCII characters; see [IMAP] section 5.1.3.
#
# Net::IMAP does _not_ automatically encode and decode
# mailbox names to and from UTF-7.
def self.decode_utf7(s)
return s.gsub(/&([^-]+)?-/n) {
if $1
($1.tr(",", "/") + "===").unpack1("m").encode(Encoding::UTF_8, Encoding::UTF_16BE)
else
"&"
end
}
end
# Encode a string from UTF-8 format to modified UTF-7.
def self.encode_utf7(s)
return s.gsub(/(&)|[^\x20-\x7e]+/) {
if $1
"&-"
else
base64 = [$&.encode(Encoding::UTF_16BE)].pack("m0")
"&" + base64.delete("=").tr("/", ",") + "-"
end
}.force_encoding("ASCII-8BIT")
end
# Formats +time+ as an IMAP-style date.
def self.format_date(time)
return time.strftime('%d-%b-%Y')
end
# Formats +time+ as an IMAP-style date-time.
def self.format_datetime(time)
return time.strftime('%d-%b-%Y %H:%M %z')
end
end
end
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