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#!/bin/sh
# (C) Tobias Wiese | GPLv2+
# This file is based on mail-host-notification.sh from Icinga used under GPLv2+ license
# Except of function urlencode which is Copyright (C) by Brian White (brian@aljex.com) used under MIT license
# Changes: The script was adapted to send Telegram Messages instead of mail.
PROG="$(basename $0)"
ICINGA2HOST="$(hostname)"
if [ -z "$(type curl)" ] ; then
echo "curl not found in \$PATH. Consider installing it." 2>&1
exit 1
fi
## Function helpers
urlencode() {
local LANG=C i=0 c e s="$1"
while [ $i -lt ${#1} ]; do
[ "$i" -eq 0 ] || s="${s#?}"
c=${s%"${s#?}"}
[ -z "${c#[[:alnum:].~_-]}" ] || c=$(printf '%%%02X' "'$c")
e="${e}${c}"
i=$((i + 1))
done
echo "$e"
}
## Keep formatting in sync with telegram-service-notification.sh
for P in DATE HOSTNAME HOSTDISPLAYNAME HOSTOUTPUT HOSTSTATE USERCHATID TYPE
do
eval "PAR=\$${P}"
if [ ! "$PAR" ] ; then
echo "Required parameter '$P' is missing." >&2
exit 1
fi
done
## Build the notification message
NOTIFICATION_MESSAGE=`cat << EOF
***** Host Monitoring on $ICINGA2HOST *****
$HOSTDISPLAYNAME is $HOSTSTATE!
Info: $HOSTOUTPUT
When: $DATE
Host: $HOSTNAME
EOF
`
## Check whether IPv4 was specified.
if [ -n "$ADDRESS" ] ; then
NOTIFICATION_MESSAGE="$NOTIFICATION_MESSAGE
IPv4: $ADDRESS"
fi
## Check whether IPv6 was specified.
if [ -n "$ADDRESS6" ] ; then
NOTIFICATION_MESSAGE="$NOTIFICATION_MESSAGE
IPv6: $ADDRESS6"
fi
## Check whether author and comment was specified.
if [ -n "$COMMENT" ] ; then
NOTIFICATION_MESSAGE="$NOTIFICATION_MESSAGE
Comment by $AUTHOR:
$COMMENT"
fi
## Check whether Icinga Web 2 URL was specified.
if [ -n "$ICINGAWEB2URL" ] ; then
NOTIFICATION_MESSAGE="$NOTIFICATION_MESSAGE
$ICINGAWEB2URL/monitoring/host/show?host=$(urlencode "$HOSTNAME")"
fi
## Check whether verbose mode was enabled and log to syslog.
if [ "$VERBOSE" = "true" ] ; then
logger "$PROG sends Telegram => $CHATID"
fi
## Send message via telegram
curl -X POST "https://api.telegram.org/bot${TOKEN}/sendMessage" \
--data-urlencode "chat_id=$USERCHATID" \
--data-urlencode "text=$NOTIFICATION_MESSAGE" \
--data-urlencode "disable_web_page_preview=true"
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