flashserve

#!/bin/sh
set -e

export FILE_PATH="$1"
if [ "$FILE_PATH" = "" ]; then
  echo 'Usage: flashserve <file>'
  exit 1
fi

export FILE_NAME="$(basename "$FILE_PATH")"
export FILE_SIZE="$(stat --printf="%s" "$FILE_PATH")"

MY_IP="$(ip route get 1.1.1.1 | grep -oP 'src \K\S+')"
MY_PORT="$(shuf -i10000-50000 -n1)"
MY_ADDR="http://$MY_IP:$MY_PORT/"

echo "
Download '$FILE_NAME' from $MY_ADDR

or scan the following with your phone:
"
echo -n "http://$MY_IP:$MY_PORT/" | qrencode -o - -tutf8
echo 'Ctrl+C to exit'

function servefile {
  echo HTTP/1.0 200
  echo Content-Type: application/octet-stream
  echo "Content-Disposition: attachment; filename=\"$FILE_NAME\""
  echo Content-Length: $FILE_SIZE
  echo
  cat "$FILE_PATH"
}
export -f servefile

socat TCP-LISTEN:"$MY_PORT",fork,reuseaddr SYSTEM:servefile