#!/bin/sh
usage="Usage: $0 bsburl

bsburl: The book index page, e.g.
        https://reader.digitale-sammlungen.de/de/fs1/object/display/bsb11274872_00005.html

Downloads all pages from a book on digitale-sammlungen.de

Note that some books may initially fail in downloading the book index
page. The reasons for this are not exactly clear, but try again in a
few minutes and it may well work. It is probably to do with some
strange caching issue."

test $# -ne 1 && echo "$usage" && exit 1

bookid=`echo "$1" | awk -F / '{printf("%s\n", $8)}'|sed 's/_.*//g'`

xml=`curl -f -s "http://daten.digitale-sammlungen.de/~db/mets/${bookid}_mets.xml"`

if test $? -ne 0 ; then
	echo "Error downloading book index page: http://daten.digitale-sammlungen.de/~db/mets/${bookid}_mets.xml"
	exit 1
fi

urls=`echo "$xml" | grep mets:FLocat | grep 'images/150' | awk -F '"' '{print $2}'`

mkdir -p "$bookid"
if test $? -ne 0 ; then
	echo "Failed to mkdir $bookname"
	exit 1
fi

echo "$urls" | while read i; do
	pgnum=`echo "$i" | awk -F '_' '{print $2}'`
	echo "Downloading page $pgnum to $bookid/$pgnum.jpg"
	curl -f -s "$i" > "${bookid}/${pgnum}.jpg"
	if test $? -ne 0 ; then
		echo "Download failed for page ${pgnum}: $i"
		rm -f "${bookid}/${pgnum}.jpg"
	fi
done