slack-notify

#!/bin/bash

# Check we have a slack domain
if [ ! -n "$SLACK_DOMAIN" ]; then
  echo 'Please specify the domain'; exit 1
fi

# Check we have a slack token
if [ ! -n "$SLACK_TOKEN" ]; then
  echo 'Please specify a token'; exit 1
fi

# Check we have a valid channel (no # at the start)
if [ ! -n "$SLACK_CHANNEL" ]; then
  echo 'Please specify a channel'; exit 1
fi
if [[ $SLACK_CHANNEL == \#* ]]; then
  echo "Please specify the channel without the '#'"; exit 1
fi

# Read the message coming in from stdin
if [ -z "$INPUT" ]; then
  MESSAGE=$(cat)
fi

# Build the JSON message
# TODO: Support coloring and attachments
JSON="{\"channel\": \"#$SLACK_CHANNEL\", \"text\": \"$MESSAGE\", \"username\": \"$SLACK_USERNAME\"}"

# Send the message
RESULT=`curl -s -d "payload=$JSON" "https://$SLACK_DOMAIN.slack.com/services/hooks/incoming-webhook?token=$SLACK_TOKEN" -w "%{http_code}"`
echo $RESULT

# TODO: Add error handling