a script to download software from Paper

download-paper.sh

help() {
  echo "Usage: ./$0 [project] [version] [output]"
  exit 0
}

check_command() {
  if ! [ -x "$(command -v $1)" ]; then
    echo "The $1 command is not available. Install the package related to it and run this script again."
    exit 1
  fi
}

if [ "$1" == "--help" ]; then
  help
fi

check_command jq
check_command curl

PROJECT="${1:-paper}"
VERSION="${2:-$(curl -s https://api.papermc.io/v2/projects/$PROJECT | jq -r '.versions[-1]')}"
OUT_JAR_NAME="${3:-server.jar}"

BASE_URL="https://api.papermc.io/v2/projects/$PROJECT/versions/$VERSION"

LATEST_BUILD=$(curl -s $BASE_URL/builds | jq -r '.builds[-1].build')

if [ "$LATEST_BUILD" == "null" ]; then
  echo "Error. Check if you specified a valid project and version. You tried to download the project $PROJECT $VERSION."
  exit 1
fi

JAR_NAME="$PROJECT-$VERSION-$LATEST_BUILD.jar"
DOWNLOAD_URL="$BASE_URL/builds/$LATEST_BUILD/downloads/$JAR_NAME"

echo "Downloading $PROJECT $VERSION build $LATEST_BUILD. Output file name: $JAR_NAME."

curl $DOWNLOAD_URL -o $OUT_JAR_NAME

love it