From b244d0ec5895ff15d52f12704e5f336ad37b4473 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Thu, 13 Aug 2020 01:44:03 +0200
Subject: Refuse to write relative URIRefs to NTriples

---
 src/writer.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'src')

diff --git a/src/writer.c b/src/writer.c
index fe29563b..697d0e7c 100644
--- a/src/writer.c
+++ b/src/writer.c
@@ -165,6 +165,12 @@ supports_abbrev(const SerdWriter* writer)
 	return writer->syntax == SERD_TURTLE || writer->syntax == SERD_TRIG;
 }
 
+static bool
+supports_uriref(const SerdWriter* writer)
+{
+	return writer->syntax == SERD_TURTLE || writer->syntax == SERD_TRIG;
+}
+
 static SerdStatus
 free_context(SerdWriter* writer)
 {
@@ -674,6 +680,15 @@ write_uri_node(SerdWriter* const        writer,
 		}
 	}
 
+	if (!has_scheme && !supports_uriref(writer) &&
+	    !serd_env_base_uri(writer->env)) {
+		SERD_LOG_ERRORF(world,
+		                SERD_ERR_INVALID,
+		                "syntax does not support URI reference <%s>\n",
+		                serd_node_string(node));
+		return SERD_ERR_INVALID;
+	}
+
 	TRY(st, esink("<", 1, writer));
 	if (!(writer->flags & SERD_WRITE_UNRESOLVED) &&
 	    serd_env_base_uri(writer->env)) {
-- 
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