main.sh

#!/usr/bin/env bash

export GITHUB_BRANCH="${GITHUB_REF##*heads/}"
export SLACK_ICON="${SLACK_ICON:-"https://avatars0.githubusercontent.com/u/43742164"}"
export SLACK_USERNAME="${SLACK_USERNAME:-"rtBot"}"
export CI_SCRIPT_OPTIONS="ci_script_options"
export SLACK_TITLE="${SLACK_TITLE:-"Message"}"
export GITHUB_ACTOR="${SLACK_MSG_AUTHOR:-"$GITHUB_ACTOR"}"

COMMIT_MESSAGE="$(cat "$GITHUB_EVENT_PATH" | jq -r '.commits[-1].message')"
export COMMIT_MESSAGE

hosts_file="$GITHUB_WORKSPACE/.github/hosts.yml"

if [[ -z "$SLACK_CHANNEL" ]]; then
	if [[ -f "$hosts_file" ]]; then
		user_slack_channel=$(cat "$hosts_file" | shyaml get-value "$CI_SCRIPT_OPTIONS.slack-channel" | tr '[:upper:]' '[:lower:]')
	fi
fi

if [[ -n "$user_slack_channel" ]]; then
	export SLACK_CHANNEL="$user_slack_channel"
fi

# Check vault only if SLACK_WEBHOOK is empty.
if [[ -z "$SLACK_WEBHOOK" ]]; then

	# Login to vault using GH Token
	if [[ -n "$VAULT_GITHUB_TOKEN" ]]; then
		unset VAULT_TOKEN
		vault login -method=github token="$VAULT_GITHUB_TOKEN" > /dev/null
	fi

	if [[ -n "$VAULT_GITHUB_TOKEN" ]] || [[ -n "$VAULT_TOKEN" ]]; then
		SLACK_WEBHOOK="$(vault read -field=webhook secret/slack)"
		export SLACK_WEBHOOK
	fi
fi

if [[ -z "$SLACK_WEBHOOK" ]]; then
  printf "[\e[0;31mERROR\e[0m] Secret \`SLACK_WEBHOOK\` is missing. Falling back to using \`SLACK_TOKEN\` and \`SLACK_CHANNEL\`.\n"
fi

if [[ -f "$hosts_file" ]]; then
	hostname=$(cat "$hosts_file" | shyaml get-value "$GITHUB_BRANCH.hostname")
	user=$(cat "$hosts_file" | shyaml get-value "$GITHUB_BRANCH.user")
	export HOST_NAME="\`$user@$hostname\`"
	DEPLOY_PATH="$(cat "$hosts_file" | shyaml get-value "$GITHUB_BRANCH.deploy_path")"
	export DEPLOY_PATH

	temp_url="${DEPLOY_PATH%%/app*}"
	export SITE_NAME="${temp_url##*sites/}"
    export HOST_TITLE="SSH Host"
fi

PR_SHA="$(cat "$GITHUB_EVENT_PATH" | jq -r .pull_request.head.sha)"
[[ 'null' != "$PR_SHA" ]] && export GITHUB_SHA="$PR_SHA"

if [[ -n "$SITE_NAME" ]]; then
    export SITE_TITLE="Site"
fi


if [[ -z "$SLACK_MESSAGE" && "null" != "$COMMIT_MESSAGE" ]]; then
	SLACK_MESSAGE="$COMMIT_MESSAGE"
fi

if [[ -z "$SLACK_MESSAGE" ]]; then
  SLACK_MESSAGE="Notification from action run \`$GITHUB_RUN_NUMBER\`, which ran against commit \`${GITHUB_SHA}\` from branch \`${GITHUB_BRANCH}\` of \`${GITHUB_REPOSITORY}\` repository."
fi

if [[ "true" == "$ENABLE_ESCAPES" ]]; then
  SLACK_MESSAGE="$(echo -e "$SLACK_MESSAGE")"
  SLACK_MESSAGE_ON_SUCCESS="$(echo -e "$SLACK_MESSAGE_ON_SUCCESS")"
  SLACK_MESSAGE_ON_FAILURE="$(echo -e "$SLACK_MESSAGE_ON_FAILURE")"
  SLACK_MESSAGE_ON_CANCEL="$(echo -e "$SLACK_MESSAGE_ON_CANCEL")"
fi

export SLACK_MESSAGE
export SLACK_MESSAGE_ON_SUCCESS
export SLACK_MESSAGE_ON_FAILURE
export SLACK_MESSAGE_ON_CANCEL

slack-notify "$@"