-#!/bin/zsh
+#!/bin/sh
-# Copyright 2014 Paul Hänsch
+# Copyright 2014, 2019, 2020 Paul Hänsch
#
# This file is part of Confetti.
#
# You should have received a copy of the GNU Affero General Public License
# along with Confetti. If not, see <http://www.gnu.org/licenses/>.
-course="${_GET[course]}"
+locktimeout=900
+. "$_EXEC"/session_lock.sh
-echo -n "Location: ?p=courses&edit=$course\n\n"
+course="$(GET course |PATH)"
+coursefile="$_DATA/ical/${course##*/}"
+
+if tempfile="$(SLOCK "$coursefile" "$locktimeout")"; then
+ REDIRECT "${_BASE}/courses/?e=${course}"
+elif [ -f "$tempfile" ]; then
+ SET_COOKIE session message="SESSLOCK"
+ REDIRECT "${_BASE}/courses/#${course}"
+else
+ SET_COOKIE session message="EDITLOCK"
+ REDIRECT "${_BASE}/courses/#${course}"
+fi