Minecraft server installer for Linux (requires fzf and jq and probably curl and tac)

mcinstall.sh

#!/usr/bin/env bash

servers=(PurpurMC PaperMC Velocity Waterfall "PocketMine-MP")
DEFAULT_SERVER="${servers[0]}"
# Dependency programs
DEPS=(curl fzf tac jq)

for i in "${DEPS[@]}"; do
  if ! command -v "$i" > /dev/null 2>&1; then
    echo "Command '$i' is not found."
    exit 1
  fi
done

echo -e "Select the server you wanted to install"
for ((i=0; i<${#servers[@]}; i++)); do
  if [ "${DEFAULT_SERVER}" = "${servers[i]}" ]; then
    echo "$((i+1)). ${servers[i]} (Default)"
  else
    echo "$((i+1)). ${servers[i]}"
  fi
done
read -rp '> ' selectserver
# make case-insensitive.
case "${selectserver,,}" in
  1|purpur|purpurmc) selectedServer="${servers[0]}";;
  2|paper|papermc) selectedServer="${servers[1]}";;
  3|velocity) selectedServer="${servers[2]}";;
  4|waterfall) selectedServer="${servers[3]}";;
  5|pmmp|pocketmine-mp|pocketmine|pocketminemp) selectedServer="${servers[4]}";;
  '') selectedServer="${DEFAULT_SERVER}";;
  *) echo "Invalid selection."; exit 1;;
esac

function getPaper() {
  case "$1" in
    velocity) 
      endpoint="https://api.papermc.io/v2/projects/velocity"
      brand="Velocity"
      id="velocity";;
    waterfall) 
      endpoint="https://api.papermc.io/v2/projects/waterfall"
      brand="Waterfall"
      id="waterfall"
      echo "WARNING: Waterfall is depecreated, consider using Velocity over Waterfall, proceed with caution!";;
    *) endpoint="https://api.papermc.io/v2/projects/paper"; brand="PaperMC"; id="paper";;
  esac
  stty -echo
  echo "[$brand] Fetching available versions..."
  tmpversion=$(curl -s "$endpoint" | jq -r '.versions[]')
  stty -echo
  version=$(fzf --tac --prompt="[$brand] Version: " --exact <<< "$tmpversion")
  unset tmpvesion
  stty -echo
  if [ -z "$version" ]; then
    echo " ╰─ Please select the version"
    stty echo
    exit 1
  fi
  echo " ╰─ Version: $version"
  echo "[$brand] Fetching available builds..."
  tmpbuild=$(curl -s "$endpoint/versions/${version}" | jq -r '.builds[]')
  stty echo
  build=$(fzf --tac --prompt="[$brand $version] Build: " --exact <<< "$tmpbuild")
  unset tmpbuild
  stty -echo
  if [ -z "$build" ]; then
    echo " ╰─ Please select the build for $version"
    stty echo
    exit 1
  fi
  echo " ╰─ Build: $build"
  stty -echo
  result=$(curl -s "$endpoint/versions/${version}/builds/${build}")
  channel="$(jq -r '.channel' <<< "${result}")"
  date="$(jq -r '.time' <<< "${result}")"
  if [ "$channel" = 'experimental' ]; then
    echo "WARNING: This build may contains bug and not compatible with some plugins, proceed with caution!"
  fi
  echo "${brand} ${version} (build #${build})"
  echo " ├─ Released in: $(date -d "${date}" '+%A %B %d, %Y (%r)')"
  echo " ╰─ Channel: $channel"
  stty echo
  read -rp "> Proceed install this build? [Y/N] (default: Y): " yn
  echo
  case "${yn:0:1}" in
    [Yy]) 
      echo "[$brand] Running: curl -o \"${id}-${version}-${build}.jar\" \"${endpoint}/versions/${version}/builds/${build}/downloads/${id}-${version}-${build}.jar\""
      curl -o "${id}-${version}-${build}.jar" "${endpoint}/versions/${version}/builds/${build}/downloads/${id}-${version}-${build}.jar"
      ;;
    [Nn]) exit 2;;
    '') 
      echo "[$brand] Running: curl -o \"${id}-${version}-${build}.jar\" \"${endpoint}/versions/${version}/builds/${build}/downloads/${id}-${version}-${build}.jar\""
      curl -o "${id}-${version}-${build}.jar" "${endpoint}/versions/${version}/builds/${build}/downloads/${id}-${version}-${build}.jar"
      ;;
    *) exit 2;;
  esac
}

getPurpur () {
  brand="PurpurMC"
  id="purpur"
  endpoint="https://api.purpurmc.org/v2/${id}"
  stty -echo
  echo "[$brand] Fetching minecraft versions.."
  tmpversion=$(curl -s "$endpoint" | jq -r '.versions[]')
  stty echo
  version=$(fzf --tac --prompt="[$brand] Version: " --exact <<< "$tmpversion")
  unset tmpvesion
  stty -echo
  if [ -z "$version" ]; then
    echo "Please select the version"
    stty echo
    exit 1
  fi
  echo " ╰─ Version: $version"
  echo "[$brand] Fetching available builds..."
  tmpbuild=$(curl -s "$endpoint/${version}" | jq -r '.builds.all[]' | sort -n)
  stty echo
  build=$(fzf --tac --prompt="[$brand $version] Build: " --exact <<< "$tmpbuild")
  unset tmpbuild
  stty -echo
  if [ -z "$build" ]; then
    echo " ╰─ Please select the build for $version"
    stty echo
    exit 1
  fi
  echo " ╰─ Build: $build"
  stty -echo
  result=$(curl -s "$endpoint/${version}/${build}")
  channel=$(jq -r '.result' <<< "${result}")
  # Unix timestamp (in milliseconds)
  date=$(jq -r '.timestamp' <<< "${result}")

  echo "$brand $version (Build #${build})"
  echo " ╰─ Build date: $(date -d "@$(("${date}"/1000))" '+%A %B %d, %Y (%r)')"
  echo " ╰─ Channel: ${channel}"
  stty echo
  read -rp "> Proceed install this build? [Y/N] (default: Y): " yn
  echo 
  
  case "${yn:0:1}" in
    [Nn]) exit 2;;
    [Yy]) 
      echo "[$brand] Running: curl -o \"${id}-${version}-${build}.jar\" \"${endpoint}/${version}/${build}/download\""
      curl -o "${id}-${version}-${build}.jar" "${endpoint}/${version}/${build}/download"
      ;;
    '')
      echo "[$brand] Running: curl -o \"${id}-${version}-${build}.jar\" \"${endpoint}/${version}/${build}/download\""
      curl -o "${id}-${version}-${build}.jar" "${endpoint}/${version}/${build}/download"
      ;;
    *) exit 2;;
  esac
}

getPMMP (){
  url="https://get.pmmp.io"
  brand="PocketMine-MP"
  # id="pmmp"
  echo "NOTICE: $brand is a server software for Bedrock Edition"
  read -rp "Press [Enter] to proceed the action." yn
  case "${yn:0:1}" in
    '') echo;;
    *) exit 2;;
  esac
  echo "[${brand}] Running ${url}"
  curl -sL "${url}" | bash -s -
}

case "$selectedServer" in
  "${servers[0]}") getPurpur;;
  "${servers[1]}") getPaper;;
  "${servers[2]}") getPaper velocity;;
  "${servers[3]}") getPaper waterfall;;
  "${servers[4]}") getPMMP;;
esac