#!/bin/bash
#
# Fetch Service Provider metadata and save into entityid filename
#

error()
{
	echo "Error: $*" 1>&2
	exit 1
}

metadataurl=$1
if [ -z "$metadataurl" ] ; then
	cat <<EOF
Usage: `basename $0` <metadataurl>
Ex:    `basename $0` https://shibsp.mysite.com/Shibboleth.sso/Metadata
       `basename $0` https://shibidp.mysite.com/idp/profile/Metadata/SAML
       `basename $0` some-downloaded-metadata.xml
       `basename $0` reep:<entityid>
       `basename $0` mdq:<entityid>
       `basename $0` <hostname> (tries to pull from standard locations)
EOF
	exit 1
fi

script_cwd=`dirname "$0"`
if test -d md ; then
	echo "Moving into md/"
	cd md
	echo "$script_cwd" | grep -q ^/ || script_cwd=../$script_cwd
fi

if echo "$metadataurl" | grep -qE '^http://|^https://' ; then
	metadata=`curl -L -s -k -f "$metadataurl"`
elif echo "$metadataurl" | grep -qE '^reep:' ; then
	id=`echo -n "$metadataurl" | sed 's/^reep://' | sha1sum | awk '{print $1}'`
	metadataurl="http://md.reep.refeds.org/entities/%7Bsha1%7D$id"
	metadata=`curl -L -s -k -f "$metadataurl"`
elif echo "$metadataurl" | grep -qE '^mdq:' ; then
        id=`echo -n "$metadataurl" | sed 's/^mdq://' | sha1sum | awk '{print $1}'`
        metadataurl="$MDQ/%7Bsha1%7D$id"
        metadata=`curl -L -s -k -f "$metadataurl"`
else
	if [ -s "${metadataurl}" ]; then
		metadata=`cat "$metadataurl"`
	else
		urls="https://${metadataurl}/idp/shibboleth https://${metadataurl}/Shibboleth.sso/Metadata https://${metadataurl}/saml/index/sp-metadata https://${metadataurl}/saml/metadata"
		for i in ${urls}; do
			metadata=`curl -L -s -k -f "${i}"`
			[ -n "${metadata}" ] && break
		done
	fi
fi
[ -n "$metadata" ] || error "Failed to fetch metadata from $metadataurl"

entityid=`echo "$metadata" | sed -n 's/.*entityID=['\''"]\([^"]*\)['\''"].*/\1/p'`
[ -n "$entityid" ] || error "Failed to find entityID in metadata"
[ `echo "$entityid" | wc -l` = 1 ] || error "Multiple entityid:s found: `echo $entityid`"

entityidfn=`echo "$entityid" | sed 's;https*://;;' | tr 'A-Z' 'a-z' | sed 's;/$;;' | sed 's/[^a-z0-9_.-]/-/g' | sed 's/\.xml$//;s/$/.xml/'`
[ -n "$entityidfn" ] || error "Failed to generate filename from entityid $entityid"

[ -r "$entityidfn" ] && new=false || new=true
if $new ; then
	echo -n "Save metadata into $entityidfn [Y/n]? "
else
	echo -n "Replace $entityidfn with metadata [Y/n]? "
fi
read x
case $x in
	Y|y|"")
		echo "$metadata" > $entityidfn
		tmp=`mktemp`
		xsltproc $script_cwd/../xslt/clean-entitydescriptor.xsl ${entityidfn} > ${tmp} && mv ${tmp} ${entityidfn} 
		;;
	*)
		echo "Nothing done"
		;;
esac