How to make notification with Signal to work

Hi

I have attempted to follow this guide to install a 3rd party notification system using Signal, with signal-cli-rest-api

Thema

[GUIDE] Use Signal Messenger as a notification service

This guide was inspired by the [GUIDE] Use Telegram as notification service by subzero79. I used Telegram for a long time. But due to a more privacy and data protection approach of Signal, I switched to Signal Messenger.

What you need

• A free phone number
• curl
• Remote ssh access with sudo access
• Docker

Signal does not offer a bot service, so we need to have an extra number to act as the bot. There are a couple of service providers which offers free phone numbers. Should be easy to obtain an extra…

gadric

2. September 2021

I've done all changes in the file, but don't get it to work, and I cannot find the logs to be able to debug it.

Can anyone point me out on where/how to look for logs when a Notification is triggered with the "Test" button in the WebGUI in the section " System/Nofication/Settings" ?

I have setup a working server to send Signal messages, so the curl command works fine when used from the ssh shell. I use the command below:

curl -X POST -H "Content-Type: application/json" 'http://<internal IP>:<port>/v2/send'      -d '{"message": "Test via Signal API!", "number": "+12345", "recipients": [ "+12345" ]}'

However, when the sync.d command shown in the GUIDE is executed, nothing happens.

there's likely a syntax error in the command shown by the GUIDE, but I can't figure out where since I don't know how to use the command "sed".

nano /usr/share/openmediavault/notification/sink.d/10signal

#!/bin/bash

sender="+12345"
recipiant="+12345"
contenttype="Content-Type: application/json"
signal_msg_url="http://<internal IP>:<port>/v2/send"

# The message file needs to altered as the new line literals does not work directly. More, monit adds a \ to the hostname. This needs to changed, too.
sed -E -i -e ':a;N;$!ba;s/\r{0,1}\n/\\n/g' -e 's|\\'"${HOSTNAME}"'|'"${HOSTNAME}"'|g' "$OMV_NOTIFICATION_MESSAGE_FILE"

content=$(cat "$OMV_NOTIFICATION_MESSAGE_FILE")

# If you want to send the message to more than 1 person, then add the number of the repcipiants in [] separated by ","
generate_msg_data()
{
  cat <<EOF
{"message": "${content}", "number": "$sender", "recipients": ["$recipiant"]}
EOF
}

curl -X POST -H "$contenttype" -d "$(generate_msg_data)" "$signal_msg_url"

thanks.