#!/usr/bin/env ruby

#### Config begin

# Trigger Token, see Project -> Settings -> CI/CD -> Pipeline triggers
trigger_token="XXXXXXXX"

# Private Token, see User -> Access Tokens -> Personal Access Tokens
auth_token="XXXXXXXX"

# GitLab install
gitlab_url="https://gitlab.example.org/"

# Satis Project id (integer, not the project name)
satis_project_id="XX"

#### Config end

require 'json'
require 'tmpdir'

payload = JSON.parse(STDIN.read)

# Only run this code in case we are dealing with tag_push event
if payload['event_name'] == 'tag_push'

	temp = Dir.tmpdir()
	shaFile = "#{temp}/gitlab-trigger.sha"

	# Get refs to compare
	payloadCurrent = "#{payload['ref']}"
	payloadBefore = File.read(shaFile) if File.exist?(shaFile)

	# Save refs to compare on next run ...
	File.delete(shaFile) if File.exist?(shaFile)
	File.write(shaFile, "#{payload['ref']}")

	# Check if composer files exists in project
	project_id="#{payload['project_id']}"
	composerExists = `curl -o /dev/null -s -w \"%{http_code}\" --request GET --header 'PRIVATE-TOKEN: #{auth_token}' '#{gitlab_url}/api/v4/projects/#{project_id}/repository/files/composer%2Ejson/raw?ref=master'`

	# Trigger Pipeline
 	if payloadBefore != payloadCurrent && composerExists == '200'
 		exec("curl --request POST --form \"token=#{trigger_token}\" --form ref=master #{gitlab_url}/api/v4/projects/#{satis_project_id}/trigger/pipeline")
	end
			
end