post message to slack

slackpost.sh

#!bash -e

TOKEN= # slack token is generate from: https://api.slack.com/web
CHANNEL= # name of channels or group
MESSAGE= # message
NICK= # bot name
IS_PRIVATE= # 1 or 0

if [ $IS_PRIVATE -eq 1 ]; then
    API_TYPE=groups
else
    API_TYPE=channels
fi

# channel info

CHANNELS_RESPONSE=$(curl "https://slack.com/api/$API_TYPE.list?token=$TOKEN")
CHANNEL_ID=$(echo $CHANNELS_RESPONSE | jq ".${API_TYPE}[]" | jq "if .name == \"$CHANNEL\" then .id else null end" -M -c -r | grep -v null)

# post message

curl -X POST \
    -F token=$TOKEN \
    -F channel=$CHANNEL_ID \
    -F "text=$MESSAGE" \
    -F username=$NICK \
    https://slack.com/api/chat.postMessage