From bc1a27bcfb4baef96e53eb30396588b310c6851f Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Sun, 10 Jan 2021 23:51:05 +0100
Subject: [PATCH] bug fix using tempfile, allow +-Buttons for add field

---
 courses/update_course.sh | 43 +++++++++++++++++++++-------------------
 1 file changed, 23 insertions(+), 20 deletions(-)

diff --git a/courses/update_course.sh b/courses/update_course.sh
index 3ddcc73..f2b4e18 100755
--- a/courses/update_course.sh
+++ b/courses/update_course.sh
@@ -27,14 +27,6 @@ course="$(POST course |PATH)"; course="${course##*/}"
 coursefile="$_DATA/ical/$course"
 attfile="$_DATA/mappings/attendance"
 
-action="$(POST action)"
-newfield="$(POST newfield |grep -m 1 -xE '[A-Z][A-Z0-9-]*')"
-
-if printf '%s\n' "$action" |grep -qxE 'addfield [A-Z][A-Z0-9]*'; then
-  newfield="${action##* }"
-  action=addfield
-fi
-
 if ! tempfile="$(CHECK_SLOCK "$coursefile")"; then
   SET_COOKIE 0 message="NO VALID FILE LOCK"
   REDIRECT "/courses/?e=${course}"
@@ -53,12 +45,12 @@ vcf_escape(){
   | sed -E ':X;$!{N;bX}; s;\n;\;;g'
 }
 
-course="$(pdi_load "$coursefile")"
+ics="$(pdi_load "$coursefile")"
 
 tzid=$(cat /etc/timezone)
 
-course="$(pdi_update_attrib "$course" DTSTAMP 1 "TZID=${tzid}")"
-course="$(pdi_update_value  "$course" DTSTAMP 1 "$(TZ="$tzid" date +%Y%m%dT%H%M%S)")"
+ics="$(pdi_update_attrib "$ics" DTSTAMP 1 "TZID=${tzid}")"
+ics="$(pdi_update_value  "$ics" DTSTAMP 1 "$(TZ="$tzid" date +%Y%m%dT%H%M%S)")"
 
 dts_year="$(  POST DTS_YEAR    |grep -m1 -xE '[0-9]{4}' || date +%Y)"
 dts_month="$( POST DTS_MONTH   |grep -m1 -xE '0[1-9]|1[012]' || date +%m)"
@@ -69,8 +61,8 @@ dts_minute="$(POST DTS_MINUTE  |grep -m1 -xE '[0-9]|[1-5][0-9]' || date +%M)"
 [ ${#dts_minute} -eq 1 ] && dts_minute="0$dts_minute"
 DTSTART="${dts_year}${dts_month}${dts_day}T${dts_hour}${dts_minute}00"
 
-course="$(pdi_update_attrib "$course" DTSTART 1 "TZID=${tzid}")"
-course="$(pdi_update_value  "$course" DTSTART 1 "$DTSTART")"
+ics="$(pdi_update_attrib "$ics" DTSTART 1 "TZID=${tzid}")"
+ics="$(pdi_update_value  "$ics" DTSTART 1 "$DTSTART")"
 
 rr_int=$(  POST RRULE_INTERVAL |grep -m1 -xE '[0-9]+' || printf 1)
 rr_count=$(POST RRULE_COUNT    |grep -m1 -xE '[0-9]+' || printf 1)
@@ -87,13 +79,13 @@ case $(POST RRULE_LIMIT) in
   ETERN|*) RRULE="FREQ=$rr_freq;INTERVAL=$rr_int";;
 esac
 
-course="$(pdi_update_value  "$course" RRULE 1 "$RRULE")"
+ics="$(pdi_update_value  "$ics" RRULE 1 "$RRULE")"
 
 for field in $(POST_KEYS |grep -xE '[A-Z][A-Z0-9-]*'); do
   for cnt in $(seq 1 $(POST_COUNT "$field")); do
     case "$field" in
       *)
-         course="$(pdi_update_value "$course" "$field" "$cnt" "$(vcf_escape "$(POST "$field" "$cnt")")")"
+         ics="$(pdi_update_value "$ics" "$field" "$cnt" "$(vcf_escape "$(POST "$field" "$cnt")")")"
         ;;
     esac
 done; done
@@ -104,14 +96,21 @@ done; done
 delete_key="$(randomid)"
 for delete in $(POST_KEYS |grep -xE '[A-Z][A-Z0-9-]*_delete_[0-9]+'); do
   f="${delete%%_*}"; c="${delete##*_}";
-  [ "$(POST "$delete")" = "true" ] && course="$(pdi_update_value "$course" "$f" "$c" "delete=${delete_key}")"
+  [ "$(POST "$delete")" = "true" ] && ics="$(pdi_update_value "$ics" "$f" "$c" "delete=${delete_key}")"
 done
-course="$(printf '%s\n' "$course" |sed -E "/^[^:]+:delete=${delete_key}\$/d")"
+ics="$(printf '%s\n' "$ics" |sed -E "/^[^:]+:delete=${delete_key}\$/d")"
 
 case "$(POST action)" in
   addfield)
-    course="$(pdi_update_value "$course" "$newfield" $(( $(pdi_count "$course" "$newfield") + 1 )) '')"
-    printf '%s' "$course" |grep -vx '' >"$tempfile"
+    newfield="$(POST newfield |grep -m 1 -xE '[A-Z][A-Z0-9-]*')"
+    ics="$(pdi_update_value "$ics" "$newfield" $(( $(pdi_count "$ics" "$newfield") + 1 )) '')"
+    printf '%s' "$ics" |grep -vx '' >"$tempfile"
+    REDIRECT "/courses/?e=${course}"
+    ;;
+  addfield\ [A-Z]*)
+    newfield="$(POST action |sed -rn '1s;^addfield ([A-Z][A-Z0-9-]*)$;\1;p')"
+    ics="$(pdi_update_value "$ics" "$newfield" $(( $(pdi_count "$ics" "$newfield") + 1 )) '')"
+    printf '%s' "$ics" |grep -vx '' >"$tempfile"
     REDIRECT "/courses/?e=${course}"
     ;;
   update)
@@ -131,7 +130,7 @@ case "$(POST action)" in
       SET_COOKIE 0 message="COULD NOT UPDATE COURSE MAPPINGS"
     fi
 
-    printf '%s' "$course" |grep -vx '' >"${tempfile}.cp"
+    printf '%s' "$ics" |grep -vx '' >"${tempfile}.cp"
     mv "${tempfile}.cp" "$coursefile"
     RELEASE_SLOCK "$coursefile"
     REDIRECT "/courses/#${course}"
@@ -147,4 +146,8 @@ case "$(POST action)" in
     RELEASE_SLOCK "$coursefile"
     REDIRECT "/courses/"
     ;;
+  *)
+    printf '%s' "$ics" |grep -vx '' >"$tempfile"
+    REDIRECT "/courses/?e=${course}"
+    ;;
 esac
-- 
2.39.2