module Net::IMAP::SASL::GS2Header

The RFC5801 §4 gs2-authzid header, when #authzid is not empty.

If #authzid is empty or nil, an empty string is returned.

# File net-imap-0.4.9.1/lib/net/imap/sasl/gs2_header.rb, line 59
def gs2_authzid
  return "" if authzid.nil? || authzid == ""
  "a=#{gs2_saslname_encode(authzid)}"
end

The RFC5801 §4 gs2-cb-flag:

“n”

The client doesn’t support channel binding.

“y”

The client does support channel binding but thinks the server does not.

“p”

The client requires channel binding. The selected channel binding follows “p=”.

The default always returns “n”. A mechanism that supports channel binding must override this method.

# File net-imap-0.4.9.1/lib/net/imap/sasl/gs2_header.rb, line 53
def gs2_cb_flag; "n" end

The RFC5801 §4 gs2-header, which prefixes the initial_client_response.

Note: the actual GS2 header includes an optional flag to indicate that the GSS mechanism is not “standard”, but since all of the SASL mechanisms using GS2 are “standard”, we don’t include that flag. A class for a nonstandard GSSAPI mechanism should prefix with “F,”.

# File net-imap-0.4.9.1/lib/net/imap/sasl/gs2_header.rb, line 37
def gs2_header
  "#{gs2_cb_flag},#{gs2_authzid},"
end

Encodes str to match RFC5801_SASLNAME.

# File net-imap-0.4.9.1/lib/net/imap/sasl/gs2_header.rb, line 67
def gs2_saslname_encode(str)
  str = str.encode("UTF-8")
  # Regexp#match raises "invalid byte sequence" for invalid UTF-8
  NO_NULL_CHARS.match str or
    raise ArgumentError, "invalid saslname: %p" % [str]
  str
    .gsub(?=, "=3D")
    .gsub(?,, "=2C")
end