#!/bin/bash

# site configuration
if [ -f ./js9config.cgi ]; then
  . ./js9config.cgi
fi

# we need wget or curl to retrieve the image
hash wget 1>/dev/null 2>&1
if [ $? = 0 ]; then
  URLGET="wget"
  URLGETARGS="-O- -q --save-headers"
else
  hash curl 1>/dev/null 2>&1
  if [ $? = 0 ]; then
    URLGET="curl"
    URLGETARGS="-i -s"
  else
    exit 1
  fi
fi

# allow query to be passed on command line for debugging
if [ "$QUERY_STRING" = "" ] ; then
    QUERY_STRING="$1"
fi

# ! and @ were the results of escape subsitutions in the archive.js plugin
url=`echo "$QUERY_STRING" | awk '{
	sub("Q=", "");
	gsub("!", "\\\\&");
	gsub("@", "?");
	print $1
}'`

# sanity check on known archives
case "$url" in
    *//archive.eso.org/dss/dss*)					;;
    *//www.cfa.harvard.edu/archive/dss*)				;;
    *//www.cfa.harvard.edu/catalog/scat*)				;;
    *//stdatu.stsci.edu/cgi-bin/dss_search*)			        ;;
    *//irsa.ipac.caltech.edu/cgi-bin/Oasis/2MASSImg/nph-2massimg*)      ;;
    *//vizier.u-strasbg.fr/viz-bin/asu-tsv*)			        ;;

    *) exit 1;;
esac

# retrieve data and send back CORS header with the data
$URLGET $URLGETARGS $url | (
 while read LINE; do
    case "$LINE" in
	""|"
")
	    echo "Access-Control-Allow-Origin: *"
	    echo
	    cat
	    exit 0
	    ;;
	[Cc]ontent-[Ee]ncoding*)
	    case $LINE in
		*gzip*)
		    echo "Content-Encoding: gzip"
		    Encoding=1
		    ;;
	    esac
	    ;;
	[Cc]ontent-[Tt]ype*)
	    case $LINE in
		*gfits*)
		    if [ "$Encoding" = "" ] ; then 
			echo "Content-Encoding: gzip"
		    fi
		    ;;
	    esac
	    echo $LINE
	    ;;
    esac
 done
)