Fix: eliminated hardcoded URL for custom versions

Old behavior: Custom versions used hardcoded download URL. this URL
should be dynamically sourced using the lookupVersion command instead.

New behavior: lookupVersion takes a second parameter, version, and
uses a simple sed replace to insert the version parameter into the
download URL dynamically, if it was successfully found.

Also, removed old bedrock version shortcuts. This can be restored and
modified to use the lookupVersion command to get the right URL if
needed. It's unclear whether there's any active servers still running
on legacy versions of bedrock (to this author).

Resolves #460

Author: thedhruvn

bedrock-entry.sh

@@ -10,8 +10,20 @@ function isTrue() {
   return 1
 }
 
+function replace_version_in_url() {
+  local original_url="$1"
+  local new_version="$2"
+
+  # Use sed to replace the version number in the URL
+  local modified_url
+  modified_url=$(echo "$original_url" | sed -E "s/(bedrock-server-)[^/]+(\.zip)/\1${new_version}\2/")
+
+  echo "$modified_url"
+}
+
 function lookupVersion() {
   platform=${1:?Missing required platform indicator}
+  customVersion=${2:-}
 
   # shellcheck disable=SC2034
   for i in {1..3}; do
@@ -23,6 +35,11 @@ function lookupVersion() {
     DOWNLOAD_URL=$(curl -s https://mc-bds-helper.vercel.app/api/latest)
   fi
 
+  if [[ -n "${customVersion}" && -n "${DOWNLOAD_URL}" ]]; then
+    DOWNLOAD_URL=$(replace_version_in_url "${DOWNLOAD_URL}" "${customVersion}")
+    return
+  fi
+
   # shellcheck disable=SC2012
   if [[ ${DOWNLOAD_URL} =~ http.*/.*-(.*)\.zip ]]; then
     VERSION=${BASH_REMATCH[1]}
@@ -65,27 +82,6 @@ if [[ ${EULA^^} != TRUE ]]; then
 fi
 
 case ${VERSION^^} in
-  1.12)
-    VERSION=1.12.0.28
-    ;;
-  1.13)
-    VERSION=1.13.0.34
-    ;;
-  1.14)
-    VERSION=1.14.60.5
-    ;;
-  1.16)
-    VERSION=1.16.20.03
-    ;;
-  1.17)
-    VERSION=1.17.41.01
-    ;;
-  1.17.41)
-    VERSION=1.17.41.01
-    ;;
-  1.18|PREVIOUS)
-    VERSION=1.18.33.02
-    ;;
   PREVIEW)
     echo "Looking up latest preview version..."
     lookupVersion serverBedrockPreviewLinux
@@ -96,17 +92,13 @@ case ${VERSION^^} in
     ;;
   *)
     # use the given version exactly
+    echo "Using given version ${VERSION}"
+    lookupVersion serverBedrockLinux "${VERSION}"
     ;;
 esac
 
 if [[ ! -f "bedrock_server-${VERSION}" ]]; then
 
-  if [[ -z "${DOWNLOAD_URL}" ]]; then
-    binPath=bin-linux
-    isTrue "${PREVIEW}" && binPath+="-preview"
-    DOWNLOAD_URL="https://minecraft.azureedge.net/${binPath}/bedrock-server-${VERSION}.zip"
-  fi
-
   [[ $TMP_DIR != /tmp ]] && mkdir -p "$TMP_DIR"
   TMP_ZIP="$TMP_DIR/$(basename "${DOWNLOAD_URL}")"