From 6c3cf46438ab49624004db8b614c261609328eec Mon Sep 17 00:00:00 2001
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Date: Mon, 21 Nov 2016 15:45:16 +0100
Subject: impressive-display: Validate PDF_URI before using it with curl.

---
 bin/impressive-display | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/bin/impressive-display b/bin/impressive-display
index f04f683..58411e7 100755
--- a/bin/impressive-display
+++ b/bin/impressive-display
@@ -157,6 +157,12 @@ else
 	RESOLUTION="$DEFAULT_RESOLUTION"
 fi
 
+if ! echo "$PDF_URI" | grep -E "^(file://|http://|https://).*"; then
+	$OUTPUT "ERROR: PDF_URI format not supported: $PDF_URI"
+	$OUTPUT "       Use file://<path>/<file>.pdf(.gz) or http(s)://<host>/<path>/<file>.pdf. Doing nothing."
+	exit -1
+fi
+
 if [ -n "${RESOLUTION}" ]; then
 	if type -p xrandr 1>/dev/null; then
 		xrandr -d :0 --output "$(echo $currentOutput)" --mode $RESOLUTION
-- 
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