💩🚧 More complete SASL error handling

lib/net/imap.rb

@@ -1255,14 +1255,28 @@ def authenticate(mechanism, *creds, sasl_ir: true, **props, &callback)
         response = authenticator.process(nil)
         cmdargs << sasl_encode_ir(response)
       end
-      result = send_command(*cmdargs) do |resp|
-        if resp.instance_of?(ContinuationRequest)
-          challenge = sasl_decode resp.data.text
-          response  = sasl_encode authenticator.process challenge
-          put_string(response + CRLF)
+      begin
+        error = false
+        result = send_command(*cmdargs) do |resp|
+          if resp.instance_of?(ContinuationRequest)
+            unless error
+              begin
+                challenge = sasl_decode resp.data.text
+                response  = sasl_encode authenticator.process(challenge)
+              rescue DataFormatError, ResponseParseError, SASL::Error => error
+              end
+            end
+            put_string(error ? "*\r\n" : response + CRLF)
+          end
         end
+      rescue ResponseError => ex
+        ex.cause ||= error if error
+        raise
       end
-      unless SASL.done?(authenticator)
+      if error
+        logout!
+        raise error
+      elsif !SASL.done?(authenticator)
         logout!
         raise SASL::AuthenticationFailed, "authentication ended prematurely"
       end