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#### [Examples](../README.md)
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## Bashbot webhook example
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### Webhook
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Bashbot default mode is to poll Telegram server for updates but Telegram offers webhook as a more efficient method to deliver updates.
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If your server is reachable from the Internet its possible to use the method described here.
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Prerequisite for receiving Telegram updates with webhook is a valid SSL certificate, a self signed certificate will not be sufficient.
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*Note:* You need at least sudo rights to setup webhook.
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2021-01-31 20:18:40 +00:00
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#### Setup Apache webhook
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Prerequisite: An Apache webserver with a valid SLL certificate chain and php enabled.\
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This should work with other webservers also but it's not testet.
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Setup webhook with Apache:
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- install bashbot as described in [Bashbot Installation](../../doc/0_install.md)
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- create file `data-bot-bash/webhook-fifo-<botname>` (_\<botname\> as in `botconfig.jssh`_)
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- run `sudo bashbot.sh init` to setup bashbot to run as same user as web server (_e.g. www_)
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- create a directory in web root: `telegram/<your_bot_token>` (_<your_bot_token> as `botconfig.jssh`_)
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- give web server access to directory (_e.g.`chown www:www -R telegram`_)
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- go into the new directory and copy all files from `examples/webhook` to it
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- edit file `BASHBOT_HOME` to contain ithe Bashbot installation directory as first line (_other lines are ignored_)
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- execute `php index.php` with user id of web server to test write access to `data-bot-bash/webhook-fifo-<botname>
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Calling `https://<yourservername>/telegram/<your_bot_token>/` will execute `index.php`
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thus append received data to the file `data-bot-bash/webhook-fifo-<botname>`.
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E.g. `https://<yourservername>/telegram/<your_bot_token>/?json={"test":"me"}` will append `{"test":"me"}`.
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Now your Server is ready to receive updates from Telegram.
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#### Default webhook processing
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This is the testet and supported default method for processing Telegram updates over webhook.
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To enable update processing delete the file `data-bot-bash/webhook-fifo-<botname>` if webhook is working as described above.
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Incoming Telegram updates are now forwarded to the script `bin/process_update.sh` for processing.
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On incoming Telegram updates the script is executed, it sources bashbot.sh and forward the update to Bashbot for processing.
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Even it seems overhead to source Bashbot for every update, it's more responsive and create less load than Bashbot polling mode.
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Nevertheles there are some limitations compared to polling mode:
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- no startup actions
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- no background* and interactive jobs
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- `addons` and `TIMER_EVENTS` are not working
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\* Workaround for background jobs is to execute `./bashbot.sh resumeback` if a new background job was started.
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#### Full webhook processing
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Full webhook processing use an external script to imitate Bashbot polling mode with webhook.
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*Warning:* This method is not much testet and may not work in all cases.
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1. Default webook method must work first!
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2. run `bashbot.sh init` to setup bashbot to run with your user id
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2. Create a named pipe: `mkfifo data-bot-bash/webhook-fifo-botname` and give the web server write access to it
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3. execute `php index.php` with user id of web server to test write access to `data-bot-bash/webhook-fifo-<botname>
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4. Start script for Bashbot webhook polling mode:\
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`bin/process-batch.sh --startbot --watch data-bot-bash/webhook-fifo-<botname>`
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The script read updates from given file line by line and forward updates to Bashbot update processing. `--startbot` will run the startup actions
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(_e.g. load addons, start TIMER, trigger first run_) and `--watch` will wait for new updates instead of exit on end of file.
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Short form: 'bin/process-batch.sh -s -w'
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If script works as expected, you may run Bashbot webook polling in background by using `./bachbot.rc starthook/stophook`.
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To switch back to default processing delete fifo `data-bot-bash/webhook-fifo-<botname>` and stop `bin/process-batch.sh`.
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#### Enable webhook on Telegram side
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To get updates via webhook your server must be reachable from the internet and you must
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instruct Telegram where to deliver updates, this is done by calling bashbot function `set_webhook`.
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*Example:*
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```bash
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bin/any_command.sh set_webhook "https://myserver.com/telegram"
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```
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instruct Telegram to use the URL `https://myserver.com/telegram/<your_bot_token>/` to deliver updates.
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After you enable webhook to deliver Telegram updates it's no more possible to poll updates with `bashbot.sh start`.
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To stop delivering of Telegram updates via webhook run `bin/any_command.sh delete_webhook`.
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**Important**: Telegram will refuse to deliver updates if your webhook has no valid SSL certificate chain.
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#### Bash webhook
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A pure bash webhook implementation is not possible without extra software because Telegram delivers
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webhook updates only over secure TLS connections with a valid SSL certificate chain.
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`socat` looks like a tool to listen for Telegram updates from bash scripts, let's see ...
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#### $$VERSION$$ v1.45-dev-77-g235f26a
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