#!/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` <hostname> (tries to pull from standard locations)
EOF
	exit 1
fi

xmldir=swamid-2.0
update_xml=true
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 "$metadataurl"`
else
	if [ -s "${metadataurl}" ]; then
		metadata=`cat "$metadataurl"`
	else
		case $metadataurl in
			[0-9][0-9]*)
				xmldir=$(curl -L -m 5 -s -k -f "https://metadata.swamid.se/?show=feed&id=${metadataurl}")
				urls="https://metadata.swamid.se/?rawXML=${metadataurl}"
				update_xml=false
				;;
			http*)
				urls="$metadataurl"
				;;
			*)
				urls="https://${metadataurl}/idp/shibboleth https://${metadataurl}/Shibboleth.sso/Metadata https://${metadataurl}/saml/index/sp-metadata https://${metadataurl}/saml/metadata https://${metadataurl}/federationmetadata/2007-06/federationmetadata.xml"
				;;
		esac
		for i in ${urls}; do
			metadata=`curl -L -m 5 -s -k -f "${i}"`
			[ -n "${metadata}" ] && break
		done
	fi
fi
[ -n "$metadata" ] || error "Failed to fetch metadata from $metadataurl"

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

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 "$entityid" | sed 's;.*://;;' | sed 's/[^a-zwA-ZW0-9_.-]/-/g' | sed 's/$/.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 $entityidfn [Y/n]? "
else
	regdate=$(sed -n 's;.*RegistrationInfo.*registrationInstant="\([^"]*\)".*;\1;p' < "$entityidfn" | head -n 1)
	echo -n "Replace $entityidfn with metadata [Y/n]? "
fi
[ -n "$regdate" ] || regdate=$(perl $script_cwd/../scripts/now_date.pl)

read x
case $x in
	Y|y|"")
		echo "$metadata" > $entityidfn
		tmp=`mktemp`
		if $update_xml ; then
			xsltproc --stringparam regDate "$regdate" $script_cwd/../xslt/add-rpi.xsl ${entityidfn} > ${tmp} && mv ${tmp} ${entityidfn}
		fi
		xsltproc $script_cwd/../xslt/clean-entitydescriptor.xsl ${entityidfn} > ${tmp} && mv ${tmp} ${entityidfn}

		if $new ; then
			echo -n "Add ${xmldir}/$entityidfn to git [Y/n]? "
			read x
			case $x in
				Y|y|"")
					git add $entityidfn
					;;
				*)
					echo "Not added"
					;;
			esac
		fi
		;;
	*)
		echo "Nothing done"
		;;
esac