Fix NoMethodError when "qop" is not present

Author: nobu

lib/net/imap/authenticators/digest_md5.rb

@@ -26,7 +26,7 @@ def process(challenge)
  sparams[k] = v
  end
 
- raise Net::IMAP::DataFormatError, "Bad Challenge: '#{challenge}'" unless c.eos?
+ raise Net::IMAP::DataFormatError, "Bad Challenge: '#{challenge}'" unless c.eos? and sparams['qop']
  raise Net::IMAP::Error, "Server does not support auth (qop = #{sparams['qop'].join(',')})" unless sparams['qop'].include?("auth")
 
  response = {

test/net/imap/test_imap_authenticators.rb

@@ -160,4 +160,11 @@ def test_digest_md5_authenticator_garbage
  auth.process('.')
  end
  end
+
+ def test_digest_md5_authenticator_no_qop
+ auth = digest_md5("user", "pass")
+ assert_raise(Net::IMAP::DataFormatError) do
+ auth.process('Qop=""')
+ end
+ end
 end