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Shell/Bash script for sending slack messages.
#!/usr/bin/env bash
####################################################################################
# Slack Bash console script for sending messages.
####################################################################################
# Installation
# $ curl -s https://gist.githubusercontent.com/andkirby/67a774513215d7ba06384186dd441d9e/raw --output /usr/bin/slack
# $ chmod +x /usr/bin/slack
####################################################################################
# USAGE
# Send message to slack channel/user
# Send a message to the channel #ch-01
# $ slack '#ch-01' 'Some message here.'
#
# Send a message to the channel #ch-01 and user @me.
# $ slack '#ch-01,@me' MESSAGE
#
# Send a message to the default channel (it must be declared in APP_SLACK_CHANNEL).
# $ slack MESSAGE
#
# VARIABLES
#
# Please declare environment variables:
# - APP_SLACK_WEBHOOK
# - APP_SLACK_CHANNEL (optional)
# - APP_SLACK_USERNAME (optional)
# - APP_SLACK_ICON_EMOJI (optional)
# You may also declare them in ~/.slackrc file.
####################################################################################
set -o pipefail
set -o errexit
set -o nounset
#set -o xtrace
init_params() {
# you may declare ENV vars in /etc/profile.d/slack.sh
if [ -z "${APP_SLACK_WEBHOOK:-}" ]; then
echo 'error: Please configure Slack environment variable: ' > /dev/stderr
echo ' APP_SLACK_WEBHOOK' > /dev/stderr
exit 2
fi
APP_SLACK_USERNAME=${APP_SLACK_USERNAME:-$(hostname | cut --delimiter=. --fields=1)}
APP_SLACK_ICON_EMOJI=${APP_SLACK_ICON_EMOJI:-:slack:}
if [ -z "${1:-}" ]; then
echo 'error: Missed required arguments.' > /dev/stderr
echo 'note: Please follow this example:' > /dev/stderr
echo ' $ slack.sh "#CHANNEL1,CHANNEL2" Some message here. ' > /dev/stderr
exit 3
fi
slack_channels=(${APP_SLACK_CHANNEL:-})
if [ "${1::1}" == '#' ] || [ "${1::1}" == '@' ]; then
# explode by comma
IFS=',' read -r -a slack_channels <<< "${1}"
shift
fi
slack_message=${@}
}
send_message() {
local channel=${1}
echo 'Sending to '${channel}'...'
curl --silent --data-urlencode \
"$(printf 'payload={"text": "%s", "channel": "%s", "username": "%s", "as_user": "true", "link_names": "true", "icon_emoji": "%s" }' \
"${slack_message}" \
"${channel}" \
"${APP_SLACK_USERNAME}" \
"${APP_SLACK_ICON_EMOJI}" \
)" \
${APP_SLACK_WEBHOOK} || true
echo
}
send_message_to_channels() {
for channel in "${slack_channels[@]:-}"; do
send_message "${channel}"
done
}
slack() {
# Set magic variables for current file & dir
__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
__file="${__dir}/$(basename "${BASH_SOURCE[0]}")"
readonly __dir __file
cd ${__dir}
if [ -f $(cd; pwd)/.slackrc ]; then
. $(cd; pwd)/.slackrc
fi
declare -a slack_channels
init_params ${@}
send_message_to_channels
}
if [ "${BASH_SOURCE[0]:-}" != "${0}" ]; then
export -f slack
else
slack ${@}
exit $?
fi
@Mte90

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Mte90 commented Aug 23, 2017

I hacked a little bit the last part to:

if [ -f $HOME/.slackrc ]; then
    . $HOME/.slackrc
fi

In that way less code and not search in the folder. Also I removed the line 100 because I changed the script name to slack-message

@andkirby

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Owner Author

andkirby commented Sep 29, 2017

So, is there some patch to improve the script? :)

@dlorent

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dlorent commented Oct 25, 2017

You should consider implementing multiple types of posting. eg. as an attachment.

@rasperepodvipodvert

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rasperepodvipodvert commented Jan 27, 2018

how can i send file?

@andkirby

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andkirby commented Feb 15, 2018

@miradnan

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miradnan commented Dec 24, 2018

Fantastic

@miradnan

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miradnan commented Dec 24, 2018

how can i send file?

Maybe put a file on s3 and send it as link. Could be a quick solution :)

@siso

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siso commented Jan 23, 2019

On OS X the BSD version of cut complains:

cut: illegal option -- -

If you replace L43 with this one, then it would support both BSD and GNU cut:

APP_SLACK_USERNAME=${APP_SLACK_USERNAME:-$(hostname | cut -d '.' -f 1)}
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