#!/bin/sh
#
# s3curl needs Digest::HMAC. To install, run:
#   $ sudo perl -MCPAN -e shell
#   > install Digest::HMAC
#
# More information:
# http://docs.amazonwebservices.com/AmazonS3/latest/index.html?LoggingHowTo.html

if [ -z "${1}" ]; then
  echo "Usage: $(basename ${0}) logged_bucket [bucket_for_logs]"
  exit 1
fi

SRC="${1}"
test -n "${2}" && DST="${2}" || DST="${1}"
echo "Access to files inside s3://${SRC} will be logged in s3://${DST}/s3-logs/${SRC}/."

ID="personal"
LANG=en_US.UTF-8

TMP=$(mktemp)

# 1. Enable writing to the target bucket.
echo "** reading acl for ${DST}"
s3curl.pl --id ${ID} -- -s "http://${DST}.s3.amazonaws.com/?acl" | sed -e 's@</AccessControlList>@<Grant><Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Group"><URI>http://acs.amazonaws.com/groups/s3/LogDelivery</URI></Grantee><Permission>WRITE</Permission></Grant><Grant><Grantee xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="Group"><URI>http://acs.amazonaws.com/groups/s3/LogDelivery</URI></Grantee><Permission>READ_ACP</Permission></Grant></AccessControlList>@g' > "${TMP}"
if [ -n "${EDITOR}" ]; then
	echo "** have a editor, letting you review acl"
	if [ -n "$(which tidy)" ]; then
		tidy -utf8 -xml -w 1024 -i -c -q -asxml -m ${TMP}
	fi
	vim ${TMP}
fi
echo "** updating acl for ${DST}"
s3curl.pl --id ${ID} --put ${TMP} -- -s "http://${DST}.s3.amazonaws.com/?acl"

# 2. Enable logging the source bucket.
cat > $TMP << END
<!-- settings for ${SRC}: -->
<BucketLoggingStatus xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
	<LoggingEnabled>
		<TargetBucket>${DST}</TargetBucket>
		<TargetPrefix>logs/${SRC}/access_log-</TargetPrefix>
	</LoggingEnabled>
</BucketLoggingStatus>
END
echo "** enabling logging for ${SRC}"
s3curl.pl --id ${ID} --put ${TMP} -- -s "http://${SRC}.s3.amazonaws.com/?logging"

rm -f ${TMP}