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|
#!/bin/bash
set +e
verwendung() {
>&2 echo 'digest-mailer collects emails into digests before sending them.'
>&2 echo ''
>&2 echo 'Usage: digest-mailer [OPTIONS]'
>&2 echo ' -f:'
>&2 echo ' flush all pending emails'
>&2 echo ' -f $receiver:'
>&2 echo ' flush pending emails to $receiver (hash)'
>&2 echo \
'#HELPTEXT# #'
exit 1
}
extract_receiver_hash() {
sed -n '
/^$/q
s/^To:\s*//
T
p
' | \
sha224sum | \
awk '{print $1}'
}
if [ "x$1" = 'x--help' ]; then
verwendung
fi
if [ "x$1" = 'x--version' ]; then
echo '#VERSION#'
exit
fi
if [ "x$1" = 'x-f' ]; then
flush=true
shift
if [ $# -eq 0 ]; then
receiver=''
else
receiver="$1"
shift
fi
else
flush=false
fi
if [ $# -ne 0 ]; then
verwendung
fi
min_delay=3600
max_delay=3600
agressivity=0
mail_cmd='sendmail -t'
if [ -r '#ETCDIR#/digest-mailer.conf' ]
then
. '#ETCDIR#/digest-mailer.conf'
fi
sender=$(
whoami | \
sha224sum | \
awk '{print $1}'
)
if ${flush} && \
[ -z "${receiver}" ]; then
exec 9> '#LIBDIR#/digest-mailer/digest-mailer.flush.from.'"${sender}"'.lock'
if ! flock -n 9; then
# silently fail if lock is not available ("flush" is not _that_ important)
exit
fi
find '#LIBDIR#/digest-mailer' -regextype grep -maxdepth 1 -mindepth 1 \
-regex ".*/${sender}\.[0-9a-f]\+\.[0-9]\+\.[0-9a-f]\+\$" | \
while read -r file; do
extract_receiver_hash < "${file}"
done | \
sort -u | \
xargs -rn1 "$0" -f
exit
fi
time=$(
date +%s
)
if ! ${flush}; then
message=$(
cat
)
receiver=$(
printf '%s\n' "${message}" | \
extract_receiver_hash
)
hash=$(
printf '%s' "${message}" | \
sha224sum | \
awk '{print $1}'
)
exec 9> '#LIBDIR#/digest-mailer/digest-mailer.from.'"${sender}"'.to.'"${receiver}"'.lock'
flock 9
# we block if that lock is not available - the sender expects his mails delivered!
printf '%s' "${message}" > "#LIBDIR#/digest-mailer/${sender}.${receiver}.${time}.${hash}"
else
exec 9> '#LIBDIR#/digest-mailer/digest-mailer.from.'"${sender}"'.to.'"${receiver}"'.lock'
if ! flock -n 9; then
# silently fail if lock is not available ("flush" is not _that_ important)
exit
fi
fi
if [ -s "#LIBDIR#/digest-mailer/${sender}.${receiver}.last-sent" ]; then
last_sent=$(
cat "#LIBDIR#/digest-mailer/${sender}.${receiver}.last-sent"
)
else
last_sent='0'
fi
first_unsent=$(
find '#LIBDIR#/digest-mailer' -regextype grep -maxdepth 1 -mindepth 1 \
-regex ".*/${sender}\.${receiver}\.[0-9]\+\.[0-9a-f]\+\$" \
-printf '%f\n' | \
cut -d. -f3 | \
sort -nr | \
tail -n1
)
if ${flush} && \
[ -z "${first_unsent}" ]; then
# no pending emails at all
exit
fi
to_send=$(
find '#LIBDIR#/digest-mailer' -regextype grep -maxdepth 1 -mindepth 1 \
-regex ".*/${sender}\.${receiver}\.[0-9]\+\.[0-9a-f]\+\$" | \
sort
)
to_send_count=$(
printf '%s\n' "${to_send}" | \
wc -l
)
if [ $((last_sent + min_delay)) -gt ${time} ]; then
# last email was sent too close
exit
fi
if [ ${to_send_count} -gt 1 ] && \
printf '%s - (%s+%s)*%s - (%s+%s)*(1-%s)\n' \
"${time}" \
"${min_delay}" "${last_sent}" "${agressivity}" \
"${max_delay}" "${first_unsent}" "${agressivity}" | \
bc | \
grep -q '^-' && \
[ $((first_unsent + max_delay)) -ge ${time} ]; then
exit
fi
printf '%s' "${time}" > "#LIBDIR#/digest-mailer/${sender}.${receiver}.last-sent"
if [ ${to_send_count} -eq 1 ]; then
${mail_cmd} < "${to_send}"
rm "${to_send}"
exit
fi
{
sed -n '
/^$/q
s/^Subject:.*$/Subject: mail-digest/
' "$(
printf '%s' "${to_send}" | \
head -n1
)"
printf '\n'
printf '%s\n' "${to_send}" | \
while read -r file; do
cat "${file}"
printf '\n'
rm "${file}"
done
} | ${mail_cmd}
|
