Simple GitLab webhook using netcat & bash

handle.sh

#!/bin/bash
read request
TOKEN='secret token from gitlab' # from https://gitlab.com/{user}/{project}/settings/integrations
HAS_TOKEN=0
while /bin/true; do
  read header
  [[ "$header" =~ 'X-Gitlab-Token' ]] && [[ "$header" =~ $TOKEN ]] && HAS_TOKEN=1;
  [[ "$header" == $'\r' ]] && break;
done

[[ $HAS_TOKEN -eq 0 ]] && exit 0;

url="${request#POST }"
url="${url% HTTP/*}"

echo -e "HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\n\r\nOK\r\n\r\n"

([[ $url = "/optional/endpoint" ]] && $(cd /project && git checkout master && git pull)&>/dev/null) &

listen.sh

while [ 1 ]; do nc -l -p 9000 -q 5 -e ./handle.sh ; done