Run given command as is with Custom AWS Lambda Runtime

function.sh

# Input is like {"command":"bHMgLWFsIHwgZ3JlcCBob2dlaG9nZQo="}
function handler () {
    EVENT_DATA="$1"
    local _cmd
    local _tmpdir
    _cmd="$(tr -d '[:space:]' <<<"$EVENT_DATA" | sed -E "s/\{[\"']command[\"']:[\"']([0-9A-Za-z+/=]*)[\"']\}/\1/" | base64 --decode)"
    _tmpdir="$(mktemp)"
    eval "$_cmd" 2> "$_tmpdir-stderr" > "$_tmpdir-stdout" || true
    echo "{\"stdout\": \"$(cat "$_tmpdir-stdout" | base64 | tr -d '\n')\", \"stderr\": \"$(cat "$_tmpdir-stderr" | base64 | tr -d '\n')\"}" || true
    rm -rf "$_tmpdir-stderr" "$_tmpdir-stdout" "$_tmpdir"
}