#!/bin/sh

usage() {
  cat <<__EOF__
usage: $(basename $0) [-hl] [-u user] [-X args] [-d args]
-h        print this help text
-l        print list of files to download
-u user   download as authenticated user
-X args   extra arguments to pass to xargs
-d args   extra arguments to pass to the download program

__EOF__
}

username=
xargsopts=
prompt=
list=
while getopts hlu:xX:d: option; do
  case $option in
  h)
    usage
    exit
    ;;
  l) list=yes ;;
  u)
    prompt=yes
    username="$OPTARG"
    ;;
  X) xargsopts="$OPTARG" ;;
  d) download_opts="$OPTARG" ;;
  ?)
    usage
    exit 2
    ;;
  esac
done

cat <<__EOF__
      Please note that running this script will result in the entire data collection to be downloaded, i.e. 2.13 GB in 31 files.

      To refine the selection and download, visit the following URL:

           https://archive.eso.org/scienceportal/home?data_collection=SHARKS

      and specify the relevant additional query constraints.

      Do you want to proceed with running this script (y/N)?
__EOF__

read continue_prompt

if [ "$continue_prompt" != "y" ]; then
  exit 0;
fi

if test -z "$xargsopts"; then
  #no xargs option speficied, we ensure that only one url
  #after the other will be used
  xargsopts='-L 1'
fi

if test -n "$prompt" -a -z "$list"; then
  trap 'stty echo 2>/dev/null; echo "Cancelled."; exit 1' INT HUP TERM
  stty -echo 2>/dev/null
  printf 'Password: '
  read password
  echo ''
  stty echo 2>/dev/null
fi

# use a tempfile to which only user has access
tempfile=$(mktemp /tmp/dl.XXXXXXXX 2>/dev/null)
test "$tempfile" -a -f $tempfile || {
  tempfile=/tmp/dl.$$
  (umask 077 && : >$tempfile)
}
trap 'rm -f $tempfile' EXIT INT HUP TERM

echo "auth_no_challenge=on" >$tempfile
# older OSs do not seem to include the required CA certificates for ESO
echo "check-certificate=off" >>$tempfile
if [ -n "$prompt" ]; then
  echo "--http-user=$username" >>$tempfile
  echo "--http-password=$password" >>$tempfile

fi
WGETRC=$tempfile
export WGETRC

unset password

if test -n "$list"; then
  cat
else
  xargs $xargsopts wget $download_opts
fi <<'__EOF__'
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.467
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.471
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.472
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.473
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.477
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.481
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.482
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.486
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.490
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.491
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.492
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.493
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.497
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.498
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.499
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.500
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.504
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.508
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.509
https://dataportal.eso.org/dataPortal/file/ADP.2022-01-31T13:43:47.513
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.624
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.625
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.626
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.627
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.628
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.629
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.630
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.631
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.632
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.633
https://dataportal.eso.org/dataPortal/file/ADP.2024-07-23T08:37:16.634
__EOF__