From 3b13aaf844f3b61950f437cb339fb881312ecf7b Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Wed, 15 Jan 2020 15:52:12 +0100
Subject: respond with CORS headers for OPTIONS pre-flight request

---
 src/mhd/mhd_responses.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'src/mhd')

diff --git a/src/mhd/mhd_responses.c b/src/mhd/mhd_responses.c
index a8c159300..d26f533e7 100644
--- a/src/mhd/mhd_responses.c
+++ b/src/mhd/mhd_responses.c
@@ -267,6 +267,29 @@ TALER_MHD_reply_json (struct MHD_Connection *connection,
 }
 
 
+/**
+ * Send back a "204 No Content" response with headers
+ * for the CORS pre-flight request.
+ *
+ * @param connection the MHD connection
+ * @return MHD result code
+ */
+int
+TALER_MHD_reply_cors_preflight (struct MHD_Connection *connection)
+{
+  struct MHD_Response *resp;
+
+  GNUNET_assert (NULL != (resp = MHD_create_response_from_buffer (0, NULL,
+                                                                  MHD_RESPMEM_PERSISTENT)));
+  /* This adds the Access-Control-Allow-Origin header.
+   * All endpoints of the exchange allow CORS. */
+  TALER_MHD_add_global_headers (resp);
+  GNUNET_assert (MHD_YES == MHD_queue_response (connection, MHD_HTTP_NO_CONTENT,
+                                                resp));
+  return MHD_YES;
+}
+
+
 /**
  * Function to call to handle the request by building a JSON
  * reply from a format string and varargs.
-- 
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