From da2ff92ca6ab63cb48655b84edc555d3f74c83ed Mon Sep 17 00:00:00 2001
From: Sjon Hortensius <sjon@parse.nl>
Date: Mon, 13 May 2019 10:41:16 +0200
Subject: [PATCH] Fix #6 - don't panic when len(Message)<2

---
 SystemdJournal2Gelf.go      |  2 +-
 SystemdJournal2Gelf_test.go | 14 ++++++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/SystemdJournal2Gelf.go b/SystemdJournal2Gelf.go
index 5b0cb9b..edd6e36 100644
--- a/SystemdJournal2Gelf.go
+++ b/SystemdJournal2Gelf.go
@@ -125,7 +125,7 @@ func (this *SystemdJournalEntry) send() {
 }
 
 func (this *SystemdJournalEntry) isJsonMessage() bool {
-	return this.Message[0:2] == `{"`
+	return len(this.Message) > 4 && this.Message[0:2] == `{"`
 }
 
 type pendingEntry struct {
diff --git a/SystemdJournal2Gelf_test.go b/SystemdJournal2Gelf_test.go
index c302414..8819df2 100644
--- a/SystemdJournal2Gelf_test.go
+++ b/SystemdJournal2Gelf_test.go
@@ -117,6 +117,20 @@ func TestDateStrippedFromMessage(t *testing.T) {
 	AssertEquals(t, 4, len(gelf.Extra))
 }
 
+func TestShortLinesDontTriggerPanic(t *testing.T) {
+	entry := SystemdJournalEntry{}
+
+	err := json.Unmarshal([]byte(`{
+        "MESSAGE" : ""
+	}`), &entry)
+
+	AssertNotError(t, err)
+
+	gelf := entry.toGelf()
+
+	AssertEquals(t, "", gelf.Short)
+}
+
 // asserts
 
 func AssertEquals(t *testing.T, expected, actual interface{}) {