telegram-bot-bash/bashbot.sh

#!/bin/bash
# bashbot, the Telegram bot written in bash.
# Written by @topkecleon, Juan Potato (@awkward_potato) and Lorenzo Santina (BigNerd95)
# http://github.com/topkecleon/bashbot

# Depends on JSON.sh (http://github.com/dominictarr/JSON.sh),
# which is MIT/Apache-licensed.

# This file is public domain in the USA and all free countries.
# If you're in Europe, and public domain does not exist, then haha.


TOKEN=''
URL='https://api.telegram.org/bot'$TOKEN
MSG_URL=$URL'/sendMessage'
PHO_URL=$URL'/sendPhoto'
UPD_URL=$URL'/getUpdates?offset='
OFFSET=0

send_message() {
	res=$(curl "$MSG_URL" -F "chat_id=$1" -F "text=$2")
}

send_photo() {
	res=$(curl "$PHO_URL" -F "chat_id=$1" -F "photo=@$2")
}

readproc() {
	coproc="$1"
	msg2send="${@/$1/}"
	echo $msg2send >&${coproc["0"]}
}

sendproc() {
	coproc="$1"
	while true;do read msg <&${coproc["0"]}; [ "$?" != "0" ] && return || send_message "$TARGET" "$msg";done
}


process_client() {
	local MESSAGE=$1
	local TARGET=$2
	local msg=""
	local pid="coproc$TARGET"
	[ "$pid" = "" ] {
		case $MESSAGE in
			'/info') msg="This is bashbot, the Telegram bot written entirely in bash.";;
			'/question') coproc "$pid" { question; } &>&1; readproc $TARGET; return;;
			*) msg="$MESSAGE";;
		esac
		send_message "$TARGET" "$msg"&
	} || {
		
		case $MESSAGE in
			'/cancel') kill ${$pid};;
			*) sendproc "$pid" "$MESSAGE";;
		esac
}

while true; do {

	res=$(curl $UPD_URL$OFFSET)

	TARGET=$(echo $res | ./JSON.sh | egrep '\["result",0,"message","chat","id"\]' | cut -f 2)
	OFFSET=$(echo $res | ./JSON.sh | egrep '\["result",0,"update_id"\]' | cut -f 2)
	MESSAGE=$(echo $res | ./JSON.sh -s | egrep '\["result",0,"message","text"\]' | cut -f 2 | cut -d '"' -f 2)

	OFFSET=$((OFFSET+1))

	if [ $OFFSET != 1 ]; then
		process_client "$MESSAGE" "$TARGET"&
		
	fi

} &>/dev/null; done