Fetch a specific entity from edugain

edugain-entity.sh

#!/bin/sh
set -e
MDS=http://mds.edugain.org/
MDSCACHE=/tmp/edugain.mds.xml
MAXAGE=3600
ENTITY=$1


AGE=$(expr $MAXAGE + 1)
if [ -e $MDSCACHE ]; then
        AGE=$(expr $(date +%s) - $(stat -c %Y $MDSCACHE))
fi
if [ $AGE -gt $MAXAGE ]; then
        echo "Refreshing eduGAIN MDS (age: $AGE)"
        curl --silent -o $MDSCACHE $MDS 
fi

head -n2 $MDSCACHE
xpath -e "//md:EntityDescriptor[@entityID=\"$ENTITY\"]" < $MDSCACHE 2>/dev/null
tail -n1 $MDSCACHE
echo

exit 0