#!/bin/sh
# This script will check, if a given RSS feed is valid code.
# It uses an external online webservice to check validity
# Email is sent to admin if:
# Feed is invalid
# OR:
# Feed is valid, but interoperability to many feedreaders could be improved
# Send bugs to linuxnetzer-aet-netz10.de
#############################################################

# Here goes the feed you want to check.
FEED="http://netz10.de/feed"

# Here goes the service (external website) we use:
SERVICE="http://www.rssboard.org/rss-validator/check.cgi?url=$FEED"

# Here we dump the service output (Test results):
DUMP="/tmp/rss.dump"

# Here goes the email adress to receive the alert:
MAILALERT="root"

# Alert Header (Subject: ...)
ALERTSUBJECT="FEED might be NOT VALID"

# Alert Message
ALERTMESSAGE="$ALERTSUBJECT Details: $SERVICE"

# Here goes your installed textbrowser including argument for dumping
TEXTBR="w3m -dump"
#TEXTBR="links -dump"

###############################################################

# Get feed validation and dump output of result
$TEXTBR $SERVICE > $DUMP

# Checking $DUMP if $FEED is valid RSS"
if
# Valid?
	[ `grep "Congratulations" $DUMP | wc -l` -eq 0  ] || \

# OR: valid, but not 100%, so interoperability could be improved
	[ `grep "interoperability" $DUMP | wc -l` -gt 0  ] 

# If one of the two checks above failed, let's send an email ...
then
	echo "$ALERTMESSAGE"
	mail -s "$ALERTSUBJECT" $MAILALERT << EOF
	$ALERTMESSAGE
EOF

# Log invalid feed to syslogd
	logger "$ALERTMESSAGE"
else
# If valid, send good news to STDOUT and syslog
	echo "$FEED is a valid RSS feed"
	logger "Checked RSS feed $FEED :  VALID"
fi

# Keep your country tidy! So let's clean up a bit...
rm $DUMP

##############################################################
# written by linuxnetzer
# http://netz10.de
# Email: linuxnetzer-*at*-netz10.de