#!/bin/bash

RC=3
ERR="Unknown error."

WARN="86400" # 1 day
CRIT="259200" # 3 day

METAPATH="/opt/shibboleth-idp/metadata/"
METADATA=("DFN-AAI-Basic-metadata-backingFile.xml" "DFN-AAI-metadata-backingFile.xml")

CURTIME=$(date +%s)
MAX=0

for i in "${METADATA[@]}"
do
        FILE="$METAPATH$i"
        MODTIME=$(stat -c %Y "$FILE" 2>/dev/null)
        if [ -z "$MODTIME" ]; then
                echo "Metadata is missing!"
                exit 2
        else
                DUR=$(( $CURTIME - $MODTIME ))
                if [ $DUR -gt $MAX ]; then
                        MAX=$DUR
                fi
        fi
done

if [ $MAX -lt $WARN ]; then
        RC=0
        ERR="Metadata is up-to-date."
else
        if [ $MAX -gt $CRIT ]; then
                RC=2
        else
                RC=1
        fi
        ERR="Metadata is too old ($MAX sec(s))"
fi

echo "$ERR"
exit $RC