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#!rsc by RouterOS
# RouterOS script: global-functions.d/notification-telegram
# Copyright (c) 2013-2021 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
:global FlushTelegramQueue;
:global NotificationFunctions;
:global SendTelegram;
:global SendTelegram2;
# flush telegram queue
:set FlushTelegramQueue do={
:global TelegramQueue;
:global LogPrintExit2;
:local AllDone true;
:local QueueLen [ :len $TelegramQueue ];
:if ([ :len [ / system scheduler find where name="FlushTelegramQueue" ] ] > 0 && $QueueLen = 0) do={
$LogPrintExit2 warning $0 ("Flushing Telegram messages from scheduler, but queue is empty.") false;
}
:foreach Id,Message in=$TelegramQueue do={
:if ([ :typeof $Message ] = "array" ) do={
:do {
/ tool fetch check-certificate=yes-without-crl output=none http-method=post \
("https://api.telegram.org/bot" . ($Message->"tokenid") . "/sendMessage") \
http-data=("chat_id=" . ($Message->"chatid") . \
"&disable_notification=" . ($Message->"silent") . \
"&disable_web_page_preview=true&parse_mode=" . ($Message->"parsemode") . \
"&text=" . ($Message->"text")) as-value;
:set ($TelegramQueue->$Id);
} on-error={
$LogPrintExit2 debug $0 ("Sending queued Telegram message failed.") false;
:set AllDone false;
}
}
}
:if ($AllDone = true && $QueueLen = [ :len $TelegramQueue ]) do={
/ system scheduler remove [ find where name="FlushTelegramQueue" ];
:set TelegramQueue;
}
}
# send notification via telegram - expects one array argument
:set ($NotificationFunctions->"telegram") do={
:local Notification $1;
:global Identity;
:global TelegramChatId;
:global TelegramChatIdOverride;
:global TelegramFixedWidthFont;
:global TelegramQueue;
:global TelegramTokenId;
:global TelegramTokenIdOverride;
:global CertificateAvailable;
:global CharacterReplace;
:global EitherOr;
:global IfThenElse;
:global LogPrintExit2;
:global SymbolForNotification;
:global UrlEncode;
:local EscapeMD do={
:global TelegramFixedWidthFont;
:global CharacterReplace;
:global IfThenElse;
:if ($TelegramFixedWidthFont != true) do={
:return ($1 . [ $IfThenElse ($2 = "body") "\n" "" ]);
}
:local Return $1;
:local Chars {
"body"={ "\\"; "`" };
"plain"={ "_"; "*"; "["; "]"; "("; ")"; "~"; "`"; ">";
"#"; "+"; "-"; "="; "|"; "{"; "}"; "."; "!" };
}
:foreach Char in=($Chars->$2) do={
:set Return [ $CharacterReplace $Return $Char ("\\" . $Char) ];
}
:if ($2 = "body") do={
:return ("```\n" . $Return . "\n```");
}
:return $Return;
}
:local ChatId [ $EitherOr ($TelegramChatIdOverride->($Notification->"origin")) $TelegramChatId ];
:local TokenId [ $EitherOr ($TelegramTokenIdOverride->($Notification->"origin")) $TelegramTokenId ];
:if ([ :len $TokenId ] = 0 || [ :len $ChatId ] = 0) do={
:return false;
}
:local Truncated false;
:local Text ("*__" . [ $EscapeMD ("[" . $Identity . "] " . ($Notification->"subject")) "plain" ] . "__*\n\n");
:local LenSubject [ :len $Text ];
:local LenMessage [ :len ($Notification->"message") ];
:local LenLink [ :len ($Notification->"link") ];
:if ($LenSubject + $LenMessage + $LenLink > 3968) do={
:set Text ($Text . [ $EscapeMD ([ :pick ($Notification->"message") 0 (3840 - $LenSubject - $LenLink) ] . "...") "body" ]);
:set Truncated true;
} else={
:set Text ($Text . [ $EscapeMD ($Notification->"message") "body" ]);
}
:if ($LenLink > 0) do={
:set Text ($Text . "\n" . [ $SymbolForNotification "link" ] . [ $EscapeMD ($Notification->"link") "plain" ]);
}
:if ($Truncated = true) do={
:set Text ($Text . "\n" . [ $SymbolForNotification "scissors" ] . \
[ $EscapeMD ("The Telegram message was too long and has been truncated, cut off " . \
(($LenText - [ :len $Text ]) * 100 / $LenText) . "%!") "plain" ]);
}
:set Text [ $UrlEncode $Text ];
:local ParseMode [ $IfThenElse ($TelegramFixedWidthFont = true) "MarkdownV2" "" ];
:do {
:if ([ $CertificateAvailable "Go Daddy Secure Certificate Authority - G2" ] = false) do={
$LogPrintExit2 warning $0 ("Downloading required certificate failed.") true;
}
/ tool fetch check-certificate=yes-without-crl output=none http-method=post \
("https://api.telegram.org/bot" . $TokenId . "/sendMessage") \
http-data=("chat_id=" . $ChatId . "&disable_notification=" . ($Notification->"silent") . \
"&disable_web_page_preview=true&parse_mode=" . $ParseMode . "&text=" . $Text) as-value;
} on-error={
$LogPrintExit2 info $0 ("Failed sending telegram notification! Queuing...") false;
:if ([ :typeof $TelegramQueue ] = "nothing") do={
:set TelegramQueue [ :toarray "" ];
}
:set Text ($Text . [ $UrlEncode ("\n" . [ $SymbolForNotification "alarm-clock" ] . \
[ $EscapeMD ("This message was queued since " . [ / system clock get date ] . \
" " . [ / system clock get time ] . " and may be obsolete.") "plain" ]) ]);
:set ($TelegramQueue->[ :len $TelegramQueue ]) { chatid=$ChatId; tokenid=$TokenId;
parsemode=$ParseMode; text=$Text; silent=($Notification->"silent") };
:if ([ :len [ / system scheduler find where name="FlushTelegramQueue" ] ] = 0) do={
/ system scheduler add name=FlushTelegramQueue interval=1m start-time=startup \
on-event=":global FlushTelegramQueue; \$FlushTelegramQueue;";
}
}
}
# send notification via telegram - expects at lease two string arguments
:set SendTelegram do={
:global SendTelegram2;
$SendTelegram2 ({ subject=$1; message=$2; link=$3; silent=$4 });
}
# send notification via telegram - expects one array argument
:set SendTelegram2 do={
:local Notification $1;
:global NotificationFunctions;
($NotificationFunctions->"telegram") ("\$NotificationFunctions->\"telegram\"") $Notification;
}