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Advanced Features
Access control
Bashbot offers functions to check what Telegram capabilities like 'chat admin' or 'chat creator' the given user has:
# return true if user is admin/owner of the bot
# -> botadmin is stored in file './botadmin'
user_is_botadmin "user"
# return true if user is creator or admin of a chat
user_is_admin "chat" "user"
# return true if user is creator of a chat or it's a one to one chat
user_is_creator "chat" "user"
# examples:
user_is_botadmin "${USER[ID]}" && send_markdown_message "${CHAT[ID]}" "You are *BOTADMIN*."
user_is_admin "${CHAT[ID]}" "${USER[ID]}" && send_markdown_message "${CHAT[ID]}" "You are *CHATADMIN*."
In addition you can check individual capabilities of users as you must define in the file ./botacl:
# file: botacl
# a user not listed here, will return false from 'user_is_allowed'
#
# Format:
# user:resource:chat
# allow user 123456789 access to all resources in all chats
123456789:*:*
# allow user 12131415 to start bot in all chats
12131415:start:*
# allow user 987654321 only to start bot in chat 98979695
987654321:start:98979695
# * are only allowed on the right hand side and not for user!
# the following examples are NOT valid!
*:*:*
*:start:*
*:*:98979695
You must use the function user_is_allowed to check if a user has the capability to do something. Example: Check if user has capability to start bot.
case "$MESSAGE" in
################################################
# GLOBAL commands start here, only edit messages
'/start'*)
user_is_botadmin "${USER[ID]}" && send_markdown_message "${CHAT[ID]}" "You are *BOTADMIN*."
if user_is_allowed "${USER[ID]}" "start" "${CHAT[ID]}" ; then
bot_help "${CHAT[ID]}"
else
send_normal_message "${CHAT[ID]}" "You are not allowed to start Bot."
;;
esac
See also Bashbot User Access Control functions
Interactive Chats
Interactive chats are short running scripts, reading user input and echo data to the user.
To create a new interactive chat script copy 'scripts/interactive.sh.clean' to e.g. 'scripts/mynewinteractive.sh', make it executable and then use 'start_proc' function from your bot, it's possible to pass two arguments. You find more examples for interactive scripts in 'examples'
usage: start_proc chat_id script arg1 arg2
usage: kill_proc chat_id
usage: check_prog chat_id
Note: From Version 0.96 on scripts must read user input from '$3' instead of stdin!
#!/bin/bash
######
# parameters
# $1 $2 args as given to start_proc chat script arg1 arg2
# $3 path to named pipe
#######################
# place your commands here
#
INPUT="${3:-/dev/stdin}" # read from stdin if run in terminal
echo "Enter a message:"
read -r test <"${INPUT}"
echo -e "Your Message: ${test}\nbye!"
message formatting and keyboards
The output of the script will be processed by 'send_messages', so you can not only send text, but also keyboards, files, locations and more. Each newline in the output will start an new message to the user, to insert line breaks in your message you must insert ' mynewlinestartshere ' instead of a newline..
To open up a keyboard in an interactive script, print out the keyboard layout in the following way:
echo "Text that will appear in chat? mykeyboardstartshere [ \"Yep, sure\" , \"No, highly unlikely\" ]"
Same goes for files:
echo "Text that will appear in chat? myfilelocationstartshere /home/user/doge.jpg"
And buttons:
echo "Text that will appear in chat. mybtextstartshere Click me myburlstartshere https://dealz.rrr.de"
And locations:
echo "Text that will appear in chat. mylatstartshere 45 mylongstartshere 45"
And venues:
echo "Text that will appear in chat. mylatstartshere 45 mylongstartshere 45 mytitlestartshere my home myaddressstartshere Diagon Alley N. 37"
You can combine them:
echo "Text that will appear in chat? mykeyboardstartshere [ \"Yep, sure\" , \"No, highly unlikely\" ] myfilelocationstartshere /home/user/doge.jpg mylatstartshere 45 mylongstartshere 45"
Please note that you can either send a location or a venue, not both. To send a venue add the mytitlestartshere and the myaddressstartshere keywords.
New in v0.6: To insert a linebreak in your message you can insert mynewlinestartshere in your echo command:
echo "Text that will appear in one message mynewlinestartshere with this text on a new line"
New in v0.7: In case you must extend a message already containing a location, a file, a keyboard etc.,
with additionial text simply add mytextstartshere additional text at the end of the string:
out="Text that will appear mylatstartshere 45 mylongstartshere 45"
[[ "$out" != *'in chat'* ]] && out="$out mytextstartshere in chat."
echo "$out"
Background Jobs
A background job is similar to an interactive chat, but can be a long running job and does only output massages, user input is ignored. It's possible to run multiple background jobs from the same chat.
To create a new interactive chat script copy 'scripts/interactive.sh.clean' to e.g. 'scripts/mynewbackground.sh', make it executable and then use 'start_back' function from your bot, it's possible to pass two arguments. You find more examples for background scripts in 'examples'
usage: start_back chat_id script jobname arg1 arg2
usage: kill_back chat_id jobname
usage: check_back chat_id jobname
start_back "examples/notify.sh" "${CHAT[ID]}" "jobname"
All output of the script will be sent to the user, to stop a background job use:
kill_back "${CHAT[ID]}" "jobname"
You can also suspend and resume currently running background jobs from outside bashbot, e.g. in your startup schripts:
./bashbot.sh suspendback
./bashbot.sh resumeback
If you want to kill all background jobs permanently run:
./bashbot.sh killback
Note: Background jobs run independent from main bot and continue running until your script exits or you stop it. Background jobs will continue running if your Bot is stopped and must be terminated separately e.g. by bashbot.sh killback
Inline queries
Inline queries allow users to send commands to your bot from every chat without going to a private chat. An inline query is started if the user type the bots name, e.g. @myBot. Everything after @myBot is immediately send to the bot.
In order to enable inline mode, send /setinline command to @BotFather and provide the placeholder text that the user will see in the input field after typing your bot’s name.
The following commands allows you to send ansers to inline queries. To enable bashbot to process inline queries set INLINE="1" in 'mycommands.sh'.
To send messages or links through an inline query:
answer_inline_query "${iQUERY[ID]}" "article" "Title of the result" "Content of the message to be sent"
To send photos in jpeg format and less than 5MB, from a website through an inline query:
answer_inline_query "${iQUERY[ID]}" "photo" "A valid URL of the photo" "URL of the thumbnail"
To send standard gifs from a website (less than 1MB) through an inline query:
answer_inline_query "${iQUERY[ID]}" "gif" "gif url"
To send mpeg4 gifs from a website (less than 1MB) through an inline query:
answer_inline_query "${iQUERY[ID]}" "mpeg4_gif" "mpeg4 gif url"
To send videos from a website through an inline query:
answer_inline_query "${iQUERY[ID]}" "video" "valid video url" "Select one mime type: text/html or video/mp4" "URL of the thumbnail" "Title for the result"
To send photos stored in Telegram servers through an inline query:
answer_inline_query "${iQUERY[ID]}" "cached_photo" "identifier for the photo"
To send gifs stored in Telegram servers through an inline query:
answer_inline_query "${iQUERY[ID]}" "cached_gif" "identifier for the gif"
To send mpeg4 gifs stored in Telegram servers through an inline query:
answer_inline_query "${iQUERY[ID]}" "cached_mpeg4_gif" "identifier for the gif"
To send stickers through an inline query:
answer_inline_query "${iQUERY[ID]}" "cached_sticker" "identifier for the sticker"
See also answer_inline_multi, answer_inline_compose and mycommands.sh for more information.
Handle send message errors
Our examples usually do not care about errors happening while sending a message, this is OK as long your bot does not send an massive aoumnt of messages. By default bashbot detects if a message is not sent and try to recover when possible, e.g. resend on throttling. In addition every send error is logged in logs/ERROR.log
Transmission results
On every message send to telegram (transmission) the results are provided in bash variables, like its done when a new message is received.
Note: the values of the variables contains always the result of the LAST transmission to telegram, every send action will overwrite them!
$BOTSENT: This array contains the parsed results from the last transmission to telegram.${BOTSENT[OK]}: contains the stringtrue: after a successful transmission${BOTSENT[ERROR]}: Error code if an error occurred${BOTSENT[DESC]}: Description text for error${BOTSENT[RETRY]}: Seconds to wait if telegram requests throtteling.
$res: temporary variable containing the full transmission result, may be overwritten by any bashbot function.
By default you don't have to care about retry, as bashbot resend the message after the requested time automatically. Only if the retry fails also an error is returned. The downside is that send_message functions will wait until resend is done.
If you want to disable automatic error processing and handle all errors manually (or don't care)
set BASHBOT_RETRY to any no zero value.
Detect bot blocked
If the we can't connect to telegram, e.g. blocked from telegram server but also any other reason,
bashbot set BOTSENT[ERROR] to 999.
To get a notification on every connection problem create a function named bashbotBlockRecover and handle blocks there.
If the function returns true (0 or no value) bashbot will retry once and then return to the calling function.
In case you return any non 0 value bashbot will return to the calling function without retry.
Note: If you disable automatic retry, se above, you disable also connection problem notification.
# somewhere in myfunctions.sh ...
MYBLOCKED="0"
function bashbotBlockRecover() {
# ups, we are blocked!
(( MYBLOCKED++ ))
# log what we got
printf "%s: Blocked %d times: %s\n" "$(date)" "${MYBLOCKED}" "$*" >>"${ERRORLOG}"
if [ "${MYBLOCKED}" -gt 10 ]; then
printf "Permanent problem abort current command: %s\n" "${MESSAGE}">>"${ERRORLOG}"
exit
fi
if do_something_to_unblock; then
# may be we removed block, e.g. changed IP address, try again
return 0
fi
# do not retry if we can't recover
return 1
}