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#!rsc by RouterOS
# RouterOS script: mod/notification-telegram
# Copyright (c) 2013-2024 Christian Hesse <mail@eworm.de>
# https://git.eworm.de/cgit/routeros-scripts/about/COPYING.md
#
# send notifications via Telegram
# https://git.eworm.de/cgit/routeros-scripts/about/doc/mod/notification-telegram.md
:global FlushTelegramQueue;
:global NotificationFunctions;
:global PurgeTelegramQueue;
:global SendTelegram;
:global SendTelegram2;
# flush telegram queue
:set FlushTelegramQueue do={
:global TelegramQueue;
:global TelegramMessageIDs;
:global IsFullyConnected;
:global LogPrintExit2;
:global ParseJson;
:if ([ $IsFullyConnected ] = false) do={
$LogPrintExit2 debug $0 ("System is not fully connected, not flushing.") false;
:return false;
}
: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 $Message ] = "array" ) do={
:do {
:local Data ([ /tool/fetch check-certificate=yes-without-crl output=user http-method=post \
("https://api.telegram.org/bot" . ($Message->"tokenid") . "/sendMessage") \
http-data=("chat_id=" . ($Message->"chatid") . "&disable_notification=" . ($Message->"silent") . \
"&reply_to_message_id=" . ($Message->"replyto") . "&disable_web_page_preview=true" . \
"&parse_mode=MarkdownV2&text=" . ($Message->"text")) as-value ]->"data");
:set ($TelegramQueue->$Id);
:set ($TelegramMessageIDs->([ $ParseJson ([ $ParseJson $Data ]->"result") ]->"message_id")) 1;
} 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 IdentityExtra;
:global TelegramChatId;
:global TelegramChatIdOverride;
:global TelegramMessageIDs;
:global TelegramQueue;
:global TelegramTokenId;
:global TelegramTokenIdOverride;
:global CertificateAvailable;
:global CharacterReplace;
:global EitherOr;
:global IfThenElse;
:global LogPrintExit2;
:global ParseJson;
:global SymbolForNotification;
:global UrlEncode;
:local EscapeMD do={
:global CharacterReplace;
:global IfThenElse;
: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 [ $EitherOr ($Notification->"chatid") \
[ $EitherOr ($TelegramChatIdOverride->($Notification->"origin")) $TelegramChatId ] ];
:local TokenId [ $EitherOr ($TelegramTokenIdOverride->($Notification->"origin")) $TelegramTokenId ];
:if ([ :len $TokenId ] = 0 || [ :len $ChatId ] = 0) do={
:return false;
}
:if ([ :typeof $TelegramMessageIDs ] = "nothing") do={
:set TelegramMessageIDs ({});
}
:local Truncated false;
:local Text ("*__" . [ $EscapeMD ("[" . $IdentityExtra . $Identity . "] " . \
($Notification->"subject")) "plain" ] . "__*\n\n");
:local LenSubject [ :len $Text ];
:local LenMessage [ :len ($Notification->"message") ];
:local LenLink [ :len ($Notification->"link") ];
:local LenSum ($LenSubject + $LenMessage + $LenLink);
:if ($LenSum > 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" ] . \
[ $EscapeMD ("The message was too long and has been truncated, cut off " . \
(($LenSum - [ :len $Text ]) * 100 / $LenSum) . "%!") "plain" ]);
}
:set Text [ $UrlEncode $Text ];
:do {
:if ([ $CertificateAvailable "Go Daddy Secure Certificate Authority - G2" ] = false) do={
$LogPrintExit2 warning $0 ("Downloading required certificate failed.") true;
}
:local Data ([ /tool/fetch check-certificate=yes-without-crl output=user http-method=post \
("https://api.telegram.org/bot" . $TokenId . "/sendMessage") \
http-data=("chat_id=" . $ChatId . "&disable_notification=" . ($Notification->"silent") . \
"&reply_to_message_id=" . ($Notification->"replyto") . "&disable_web_page_preview=true" . \
"&parse_mode=MarkdownV2&text=" . $Text) as-value ]->"data");
:set ($TelegramMessageIDs->([ $ParseJson ([ $ParseJson $Data ]->"result") ]->"message_id")) 1;
} on-error={
$LogPrintExit2 info $0 ("Failed sending telegram notification! Queuing...") false;
:if ([ :typeof $TelegramQueue ] = "nothing") do={
:set TelegramQueue ({});
}
:set Text ($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=$TokenId;
text=$Text; silent=($Notification->"silent"); replyto=($Notification->"replyto") };
: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;");
}
}
}
# purge the Telegram queue
:set PurgeTelegramQueue do={
:global TelegramQueue;
/system/scheduler/remove [ find where name="_FlushTelegramQueue" ];
:set TelegramQueue;
}
# send notification via telegram - expects at least 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;
}
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