From 4e1c56a66129cc3b6d6a246f880836cfdbcece8e Mon Sep 17 00:00:00 2001
From: Bensuperpc <bensuperpc@gmail.com>
Date: Tue, 14 Jun 2022 00:39:19 +0200
Subject: [PATCH] Add custom download URL for Purpur

Add custom download URL for Purpur

Signed-off-by: Bensuperpc <bensuperpc@gmail.com>
---
 README.md                  |  1 +
 scripts/start-deployPurpur | 56 +++++++++++++++++++++++---------------
 2 files changed, 35 insertions(+), 22 deletions(-)

diff --git a/README.md b/README.md
index 37e7630d7a9..dc9e5d93669 100644
--- a/README.md
+++ b/README.md
@@ -460,6 +460,7 @@ Extra variables:
 - `PURPUR_BUILD=LATEST` : set a specific Purpur build to use
 - `FORCE_REDOWNLOAD=false` : set to true to force the located server jar to be re-downloaded
 - `USE_FLARE_FLAGS=false` : set to true to add appropriate flags for the built-in [Flare](https://blog.airplane.gg/flare) profiler
+- `PURPUR_DOWNLOAD_URL=<url>` : set URL to download Purpur from custom URL.
 
 ### Running a Magma server
 
diff --git a/scripts/start-deployPurpur b/scripts/start-deployPurpur
index 499253b1fdb..162da6c125c 100755
--- a/scripts/start-deployPurpur
+++ b/scripts/start-deployPurpur
@@ -6,33 +6,45 @@ IFS=$'\n\t'
 . "${SCRIPTS:-/}start-utils"
 isDebugging && set -x
 
-: "${VANILLA_VERSION:?}"
-: "${PURPUR_BUILD:=LATEST}"
-: "${FORCE_REDOWNLOAD:=false}"
-
-if [[ ${PURPUR_BUILD} == LATEST ]]; then
-  if ! PURPUR_BUILD=$(get --json-path=".builds.latest" "https://api.purpurmc.org/v2/purpur/${VANILLA_VERSION}"); then
-    log "ERROR: Failed to locate a Purpur build for ${VANILLA_VERSION}."
-    log "       Please check if a download is available at https://purpur.pl3x.net/downloads/"
-    exit 1
+if [[ $PURPUR_DOWNLOAD_URL ]]; then
+  export SERVER=$(getFilenameFromUrl "${PURPUR_DOWNLOAD_URL}")
+
+  if [ -f "$SERVER" ]; then
+    zarg=(-z "$SERVER")
   fi
-fi
 
-export SERVER="purpur-${VANILLA_VERSION}-${PURPUR_BUILD}.jar"
+  echo "Preparing custom Purpur jar from $PURPUR_DOWNLOAD_URL"
 
-log "Removing old Purpur versions ..."
-shopt -s nullglob
-for f in purpur-*.jar; do
-  [[ $f != "$SERVER" ]] && rm "$f"
-done
+  curl -fsSL -o "$SERVER" "${zarg[@]}" "${PURPUR_DOWNLOAD_URL}"
+else
+  : "${VANILLA_VERSION:?}"
+  : "${PURPUR_BUILD:=LATEST}"
+  : "${FORCE_REDOWNLOAD:=false}"
 
-if [ ! -f "$SERVER" ] || isTrue "$FORCE_REDOWNLOAD"; then
-    downloadUrl="https://api.purpurmc.org/v2/purpur/${VANILLA_VERSION}/${PURPUR_BUILD}/download"
-    log "Downloading Purpur from $downloadUrl ..."
-    if ! get -o "$SERVER" "$downloadUrl"; then
-      log "ERROR: failed to download from $downloadUrl (status=$?)"
-      exit 3
+  if [[ ${PURPUR_BUILD} == LATEST ]]; then
+    if ! PURPUR_BUILD=$(get --json-path=".builds.latest" "https://api.purpurmc.org/v2/purpur/${VANILLA_VERSION}"); then
+      log "ERROR: Failed to locate a Purpur build for ${VANILLA_VERSION}."
+      log "       Please check if a download is available at https://purpur.pl3x.net/downloads/"
+      exit 1
     fi
+  fi
+
+  export SERVER="purpur-${VANILLA_VERSION}-${PURPUR_BUILD}.jar"
+
+  log "Removing old Purpur versions ..."
+  shopt -s nullglob
+  for f in purpur-*.jar; do
+    [[ $f != "$SERVER" ]] && rm "$f"
+  done
+
+  if [ ! -f "$SERVER" ] || isTrue "$FORCE_REDOWNLOAD"; then
+      downloadUrl="https://api.purpurmc.org/v2/purpur/${VANILLA_VERSION}/${PURPUR_BUILD}/download"
+      log "Downloading Purpur from $downloadUrl ..."
+      if ! get -o "$SERVER" "$downloadUrl"; then
+        log "ERROR: failed to download from $downloadUrl (status=$?)"
+        exit 3
+      fi
+  fi
 fi
 
 # Normalize on Spigot for later operations