Bash script to download the latest Paper Minecraft server jar through their API

download_paper.sh

#!/usr/bin/bash
#Author: bitrot_alpha
#This script will download the latest Paper jars from PaperMC's API and copy them to the
#   desired place(s)
#Programs required: curl, jq, wget, sha256sum

#cd wherever you want the script to run out of
cd ~/.ampdata/instances/
pwd
name=paper
version=1.19
api=https://api.papermc.io/v2

#location(s) of where you want the file copied to
#dirstmp=./minecraft_server/
dirstmp=$(ls | grep YC | grep -v YCP)

echo "Removing old Paper jars from current folder"
rm -Iv paper-*.jar
echo "Directories getting new Paper Jars: $dirstmp"
echo "Downloading new Paper jar"

#Get info about the latest build
latest_build="$(curl -sX GET "$api"/projects/"$name"/version_group/"$version"/builds -H 'accept: application/json' | jq '.builds [-1].build')"
revision="$(curl -sX GET "$api"/projects/"$name"/version_group/"$version"/builds -H 'accept: application/json' | jq -r '.builds [-1].version')"
filename="$(curl -sX GET "$api"/projects/"$name"/version_group/"$version"/builds -H 'accept: application/json' | jq -r '.builds [-1].downloads.application.name')"
checksum="$(curl -sX GET "$api"/projects/"$name"/version_group/"$version"/builds -H 'accept: application/json' | jq -r '.builds [-1].downloads.application.sha256')"

#cobble together the URL
download_url="$api"/projects/"$name"/versions/"$revision"/builds/"$latest_build"/downloads/"$filename"

#grab the jar
wget "$download_url"

#Verify jar checksum
echo "$checksum ./$filename" > check.tmp
sha256sum -cw check.tmp
filesum=$?
rm check.tmp

#Copy jar to destination folders
#for loop not necessary for one destination
if [[ $filesum -eq 0 ]]; then
    echo "Copying $filename to $dirstmp folders"
    for dirs in $dirstmp; do
        cp -v ./$filename $dirs/Minecraft/
    done
else
    echo "Downloaded jar did not match checksum. Try again maybe."
fi

echo "Finished! :))"

This Reddit post was helpful in making this script: How to download the latest version of Paper using the v2 API

would you mind if I use this in one of my scripts?

@silverace71 I know it's quite late, but sure, go ahead! If you already did, hope it was helpful.

Done a while back, sorry. Had to fix some things tho but it seems to be broken again so im going to fix it again in like an hour from now lol