Add Gitlab hook script

Gitlab-hook-script.md

@@ -0,0 +1,61 @@
+# Hook script to update a key in Gitlab pages
+
+The script pushes the challenge to the pages git defined in $REPO, waits for it to be deployed, receives the key, uploads it to Gitlab and cleans up the repo afterwads.
+
+## Code
+
+```bash
+#!/bin/sh -e
+#
+# dehydrated hook script to deploy a key to Gitlab.
+#
+# Add the following options to your config file:
+# TOKEN= API token, generate in Gitlab profile settings (select API access)
+# PROJECT= project ID on Gitlab (general project settings)
+# REPO= path to local git repo of your pages project
+
+. "$BASEDIR/$CONFIG"
+
+deploy_challenge() {
+  DOMAIN="$1"
+  TOKEN_FILENAME="$2"
+  cd "$REPO"
+  mkdir -p public/.well-known/acme-challenge
+  cp "$WELLKNOWN/$TOKEN_FILENAME" public/.well-known/acme-challenge/
+  git add public/.well-known/acme-challenge/"$TOKEN_FILENAME"
+  git commit -m "Let's Encrypt challenge"
+  git push
+  sleep 20
+  while ! curl --output /dev/null --silent --head --fail "http://$DOMAIN/.well-known/acme-challenge/$TOKEN_FILENAME"; do
+    echo sleeping
+    sleep 5
+  done
+}
+
+clean_challenge() {
+  TOKEN_FILENAME="$2"
+  cd "$REPO"
+  git reset --hard HEAD~
+  git push --force-with-lease
+}
+
+deploy_cert() {
+  DOMAIN="$1"
+  KEYFILE="$2"
+  FULLCHAINFILE="$4"
+  curl --request PUT --header "PRIVATE-TOKEN: $TOKEN" --form "certificate=@$FULLCHAINFILE" --form "key=@$KEYFILE" "https://gitlab.com/api/v4/projects/$PROJECT/pages/domains/$DOMAIN"
+}
+
+HANDLER="$1"; shift
+case "$HANDLER" in
+  deploy_challenge)
+    deploy_challenge "$@"
+  ;;
+  clean_challenge)
+    clean_challenge "$@"
+  ;;
+  deploy_cert)
+    deploy_cert "$@"
+  ;;
+esac
+```