Make sc.txt.cgi slightly more paranoid

diff --git a/cgi-bin/sc.txt.cgi b/cgi-bin/sc.txt.cgi
index dc2c357a89db93bc8490bd7baac1fb68d07c4232..ebdbfbefc1f1e68abcbcd094b5bddbe9f166d97c 100755 (executable)
--- a/cgi-bin/sc.txt.cgi
+++ b/cgi-bin/sc.txt.cgi
@@ -5,7 +5,7 @@ echo
 QUERY_FILE="${PATH_TRANSLATED}"
 [[ "${QUERY_FILE}" == *.sc.txt ]] || echo "Invalid .sc.txt file" >/dev/stderr && exit 1
 QUERY_SC_FILE="$(echo "${QUERY_FILE} | sed -e 's/.txt$//')"
-echo "${QUERY_SC_FILE}" >/dev/stderr
+[ -f "${QUERY_SC_FILE}" ] || echo "Invalid .sc file" >/dev/stderr && exit 1
 
 echo "Source: https://za3k.com/${QUERY_SC_FILE}"
 echo