From de59864f2d3fa6bc6b496405e2141da499257d3a Mon Sep 17 00:00:00 2001
From: Aki Tuomi <aki.tuomi@dovecot.fi>
Date: Tue, 6 Jun 2017 12:44:55 +0300
Subject: [PATCH] lib-oauth2: Accept empty responses

---
 src/lib-oauth2/oauth2.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/lib-oauth2/oauth2.c b/src/lib-oauth2/oauth2.c
index 83545b8e0d..a694dbf7ab 100644
--- a/src/lib-oauth2/oauth2.c
+++ b/src/lib-oauth2/oauth2.c
@@ -49,6 +49,12 @@ oauth2_parse_json(struct oauth2_request *req)
 		(void)json_parser_deinit(&req->parser, &error);
 		error = "Invalid response data";
 		success = FALSE;
+	} else if (i_stream_is_eof(req->is) &&
+		   req->is->v_offset == 0 && req->is->stream_errno == 0) {
+		/* discard error, empty response is OK. */
+		(void)json_parser_deinit(&req->parser, &error);
+		error = NULL;
+		success = TRUE;
 	} else {
 		ret = json_parser_deinit(&req->parser, &error);
 		success = (ret == 0);