telegram-bot-bash/README.txt
Kay Marquardt (Gnadelwartz) 31c6c4b111 add test URL for getMe
2019-05-24 10:47:27 +02:00

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<h2><img align="middle"
src="https://raw.githubusercontent.com/odb/official-bash-logo/master/assets/Logo
s/Icons/PNG/64x64.png" >
Bashbot - A Telegram bot written in bash.
</h2>
Written by Drew (@topkecleon), Daniil Gentili (@danogentili), and Kay M
(@gnadelwartz).
Contributions by JuanPotato, BigNerd95, TiagoDanin, and iicc1.
Released to the public domain wherever applicable.
Elsewhere, consider it released under the
[WTFPLv2](http://www.wtfpl.net/txt/copying/).
## Prerequisites
Uses [JSON.sh](http://github.com/dominictarr/JSON.sh), but no more TMUX.
Even bashbot is written in bash, it depends on commands typically availible in
a Unix/Linux Environment.
More concret on the common commands provided by
[coreutils](https://en.wikipedia.org/wiki/List_of_GNU_Core_Utilities_commands),
[busybox](https://en.wikipedia.org/wiki/BusyBox#Commands) or
[toybox](https://landley.net/toybox/help.html), see [Developer
Notes](doc/7_develop.md#common-commands)
Bashbot [Documentation](https://github.com/topkecleon/telegram-bot-bash) and
[Downloads](https://github.com/topkecleon/telegram-bot-bash/releases) are
availible on www.github.com
## Documentation
* [Introdution to Telegram Bots](https://core.telegram.org/bots)
* [One Bot to rule them
all](https://core.telegram.org/bots#3-how-do-i-create-a-bot)
* [Bot commands](https://core.telegram.org/bots#commands)
* [Install Bashbot](doc/0_install.md)
* Install release
* Install from githup
* Update Bashbot
* Notes on Updates
* [Create a new Telegram Bot with botfather](doc/1_firstbot.md)
* [Getting Started](doc/2_usage.md)
* Managing your Bot
* Recieve data
* Send messages
* Send files, locations, keyboards
* [Advanced Features](doc/3_advanced.md)
* Access Control
* Interactive Chats
* Background Jobs
* Inline queries
* [Expert Use](doc/4_expert.md)
* Handling UTF-8 character sets
* Run as other user or system service
* Scedule bashbot from Cron
* [Best Practices](doc/5_practice.md)
* Customize commands.sh
* Seperate logic from commands
* Test your Bot with shellcheck
* [Function Reference](doc/6_reference.md)
* Sending Messages, Files, Keyboards
* User Access Control
* Inline Queries
* Background and Interactive Jobs
* [Deveoper Notess](doc/7_develop.md)
* Setup your environment
* Test, Add, Push changes
* Prepare a new version
* Bashbot testsuite
* [Expert Use](doc/8_custom.md)
* Use from CLI and Scripts
* Customize Bashbot Environment
* [Examples](examples/README.md)
## Security Considerations
Running a Telegram Bot means it is connected to the public and you never know
whats send to your Bot.
Bash scripts in general are not designed to be bullet proof, so consider this
Bot as a proof of concept. Bash programmers often struggle with 'quoting hell'
and globbing, see [Implications of wrong
quoting](https://unix.stackexchange.com/questions/171346/security-implications-o
f-forgetting-to-quote-a-variable-in-bash-posix-shells)
Whenever you are processing input from from untrusted sources (messages, files,
network) you must be as carefull as possible, e.g. set IFS appropriate, disable
globbing (set -f) and quote everthing. In addition delete unused scripts and
examples from your Bot, e.g. scripts 'notify', 'calc', 'question', and disable
all not used commands.
A powerful tool to improve your scripts is ```shellcheck```. You can [use it
online](https://www.shellcheck.net/) or [install shellcheck
locally](https://github.com/koalaman/shellcheck#installing). Shellcheck is used
extensive in bashbot development to enshure a high code quality, e.g. it's not
allowed to push changes without passing all shellcheck tests.
In addition bashbot has a [test suite](doc/7_develop.md) to check if important
functionality is working as expected.
### Run your Bot as a restricted user
**I recommend to run your bot as a user, with almost no access rights.**
All files your Bot have write access to are in danger to be overwritten/deleted
if your bot is hacked.
For the same reason ervery file your Bot can read is in danger to be disclosed.
Restict your Bots access rigths to the absolute minimum.
**Never run your Bot as root, this is the most dangerous you can do!** Usually
the user 'nobody' has almost no rights on Unix/Linux systems. See [Expert
use](doc/4_expert.md) on how to run your Bot as an other user.
### Secure your Bot installation
**Your Bot configuration must no be readable from other users.** Everyone who
can read your Bots token can act as your Bot and has access to all chats your
Bot is in!
Everyone with read access to your Bot files can extract your Bots data.
Especially your Bot Token in ```token``` must be protected against other users.
No one exept you must have write access to the Bot files. The Bot must be
restricted to have write access to ```count``` and ```tmp-bot-bash``` only,
all other files must be write protected.
To set access rights for your bashbot installation to a reasonable default run
```sudo ./bashbot.sh init``` after every update or change to your installation
directory.
## FAQ
### Is this Bot insecure?
Bashbot is not more (in)secure as any other Bot written in any other language,
we have done our best to make it as secure as possible. But YOU are responsible
for the bot commands you wrote and you should know about the risks ...
### Why Bash and not the much better xyz?
Well, thats a damn good question ... may be because I'm an Unix/Linux admin
from stone age. Nevertheless there are more reasons from my side:
- bashbot will run everywhere where bash is availible, from ebedded linux to
mainframe
- easy to integrate with other shell script, e.g. for sending system message /
health status
- no need to install or learn a new programming language, library or framework
- no database, not event driven, not OO ...
### Can I have the single bashbot.sh file back?
At the beginning bashbot was simply the file ```bashbot.sh``` you can copy
everywhere and run the bot. Now we have 'commands.sh', 'mycommands.sh',
'modules/*.sh' and much more.
Hey no Problem, if you are finished with your cool bot run
```dev/make-standalone.sh``` to create a stripped down Version of your bot
containing only
'bashbot.sh' and 'commands.sh'! For more information see [Create a stripped
down Version of your Bot](doc/7_develop.md)
### Why do I get "EXPECTED value GOT EOF" on start?
May be your IP is blocked by telegram. You can test this by running curl or
wget manually:
```bash
curl -m 10 https://api.telegram.org/bot
#curl: (28) Connection timed out after 10001 milliseconds
wget -t 1 -T 10 https://api.telegram.org/bot
#Connecting to api.telegram.org (api.telegram.org)|46.38.243.234|:443...
failed: Connection timed out.
```
This may happen if to many wrong requests are sent to api.telegram.org, e.g.
using a wrong token or not existing API calls. If you have a fixed IP you can
ask telegram service to unblock your ip or change your IP. If you are running a
tor proxy on your server you may uncomment the ```BASHBOT_CURL_ARGS``` line in
'mycommands.sh'
@Gnadelwartz
## That's it!
If you feel that there's something missing or if you found a bug, feel free to
submit a pull request!
#### $$VERSION$$ v0.90-dev-8-gf74e95d