dns_gandi_livedns: delete the TXT record when rm removes its last value

rm PUT the remaining values back even when none were left, leaving an
empty TXT rrset behind. Use DELETE (204 on success) in that case; keep
PUT when other values remain, since the rrset can hold values from
other pending validations.

Refs #7347

dnsapi/dns_gandi_livedns.sh

@@ -87,6 +87,20 @@ dns_gandi_livedns_rm() {
   _new_rrset_values=$(echo "$_new_rrset_values" | sed "s/\[ *,/\[/g")
   _debug "New rrset_values" "$_new_rrset_values"
 
+  # Last value removed: delete the record instead of leaving an empty TXT rrset.
+  if [ "$(echo "$_new_rrset_values" | tr -d ' ')" = "[]" ]; then
+    if ! _gandi_livedns_rest DELETE "domains/$_domain/records/$_sub_domain/TXT"; then
+      return 1
+    fi
+    _gandi_livedns_code="$(grep "^HTTP" "$HTTP_HEADER" | _tail_n 1 | cut -d " " -f 2 | tr -d "\\r\\n")"
+    if [ "$_gandi_livedns_code" != "204" ]; then
+      _err "Error deleting record: $response"
+      return 1
+    fi
+    _info "Removing record $(__green "success")"
+    return 0
+  fi
+
   _gandi_livedns_rest PUT \
     "domains/$_domain/records/$_sub_domain/TXT" \
     "{\"rrset_ttl\": 300, \"rrset_values\": $_new_rrset_values}" &&