docker-minecraft-server/scripts/start-deployPaper

#!/bin/bash

. ${SCRIPTS:-/}start-utils
set -o pipefail
isDebugging && set -x

if [[ $PAPER_DOWNLOAD_URL ]]; then
  export SERVER=$(getFilenameFromUrl "${PAPER_DOWNLOAD_URL}")

  if [ -f "$SERVER" ]; then
    zarg=(-z "$SERVER")
  fi

  echo "Preparing custom PaperMC jar from $PAPER_DOWNLOAD_URL"

  curl -fsSL -o "$SERVER" "${zarg[@]}" "${PAPER_DOWNLOAD_URL}"
else
  # PaperMC API v2 docs : https://papermc.io/api/docs/swagger-ui/index.html?configUrl=/api/openapi/swagger-config

  build=${PAPERBUILD:=$(curl -fsSL "https://papermc.io/api/v2/projects/paper/versions/${VANILLA_VERSION}" -H  "accept: application/json" \
   | jq '.builds[-1]')}
  case $? in
    0)
      ;;
    22)
      versions=$(curl -fsSL "https://papermc.io/api/v2/projects/paper" -H  "accept: application/json")
      if [[ $VERSION = LATEST ]]; then
          VANILLA_VERSION=$(echo "$versions" | jq -r '.versions[-1]')
          log "WARN: using ${VANILLA_VERSION} since that's the latest provided by PaperMC"
          # re-execute the current script with the newly computed version
          exec "$0" "$@"
      fi
      log "ERROR: ${VANILLA_VERSION} is not published by PaperMC"
      log "       Set VERSION to one of the following: "
      log "       $(echo "$versions" | jq -r '.versions | join(", ")')"
      exit 1
      ;;
    *)
      echo "ERROR: unknown error while looking up PaperMC version=${VANILLA_VERSION}"
      exit 1
      ;;
  esac
  if [ $? != 0 ]; then
    echo "ERROR: failed to lookup PaperMC build from version ${VANILLA_VERSION}"
    exit 1
  fi

  export SERVER=$(curl -fsSL "https://papermc.io/api/v2/projects/paper/versions/${VANILLA_VERSION}/builds/${build}" -H  "accept: application/json" \
   | jq -r '.downloads.application.name')
  if [ $? != 0 ]; then
    echo "ERROR: failed to lookup PaperMC download file from version=${VANILLA_VERSION} build=${build}"
    exit 1
  fi

  if [ -f "$SERVER" ]; then
    zarg=(-z "$SERVER")
  fi

  log "Removing old PaperMC versions ..."
  shopt -s nullglob
  for f in paper-*.jar; do
    [[ $f != $SERVER ]] && rm $f
  done

  log "Downloading PaperMC $VANILLA_VERSION (build $build) ..."
  curl -fsSL -o "$SERVER" "${zarg[@]}" \
    "https://papermc.io/api/v2/projects/paper/versions/${VANILLA_VERSION}/builds/${build}/downloads/${SERVER}" \
    -H  "accept: application/java-archive"
  if [ $? != 0 ]; then
    echo "ERROR: failed to download PaperMC from version=${VANILLA_VERSION} build=${build} download=${SERVER}"
    exit 1
  fi
fi

# Normalize on Spigot for downstream operations
export FAMILY=SPIGOT

exec ${SCRIPTS:-/}start-spiget "$@"