Execute bash command for all incoming mails (Postfix) - bash

Question

I want to execute a command on the body of every incoming postfix mail.
sed ':a;N;$!ba;s/=\n//g' /path-to/message-file | sed 's/</\n\</g' | sed -r '/'"$(sed -r 's/\\/\\\\/g;s/\//\\\//g;s/\^/\\^/g;s/\[/\\[/g;s/'\''/'\'"\\\\"\'\''/g;s/\]/\\]/g;s/\*/\\*/g;s/\$/\\$/g;s/\./\\./g' whitelist | paste -s -d '|')"'/! s/http/httx/g'
I think it could be possible with Postfix After-Queue Content Filter, but I don't know how to do it...
EDIT:
afterqueue.sh
#!/bin/sh
# Simple shell-based filter. It is meant to be invoked as follows:
# /path/to/script -f sender recipients...
# Localize these. The -G option does nothing before Postfix 2.3.
INSPECT_DIR=/var/spool/filter
SENDMAIL="/usr/sbin/sendmail -G -i" # NEVER NEVER NEVER use "-t" here.
# Exit codes from <sysexits.h>
EX_TEMPFAIL=75
EX_UNAVAILABLE=69
# Clean up when done or when aborting.
trap "rm -f in.$$" 0 1 2 3 15
# Start processing.
cd $INSPECT_DIR || {
echo $INSPECT_DIR does not exist; exit $EX_TEMPFAIL; }
cat >in.$$ || {
echo Cannot save mail to file; exit $EX_TEMPFAIL; }
# Specify your content filter here.
sh /path/to/remove_links.sh <in.$$
$SENDMAIL "$#" <in.$$
exit $?
remove_links.sh
#!/bin/bash
sed ':a;N;$!ba;s/=\n//g' $1 | sed 's/</\n\</g' | sed -r '/'"$(sed -r 's/\\/\\\\/g;s/\//\\\//g;s/\^/\\^/g;s/\[/\\[/g;s/'\''/'\'"\\\\"\'\''/g;s/\]/\\]/g;s/\*/\\*/g;s/\$/\\$/g;s/\./\\./g' /path/to/whitelist | paste -s -d '|')"'/! s/http/httx/g'
It is working, if I call it by hand, but if I add it to the /etc/postfix/master.cf like this:
# =============================================================
# service type private unpriv chroot wakeup maxproc command
# (yes) (yes) (yes) (never) (100)
# =============================================================
filter unix - n n - 10 pipe
flags=Rq user=filter null_sender=
argv=/path/to/afterqueue.sh -f ${sender} -- ${recipient}
there are no changes in the mail.
I get the following syslog:
Apr 13 15:14:08 rs211184 postfix/qmgr[7492]: 3FFDF23CB5F: from=<test#gmail.com>, size=4358, nrcpt=1 (queue active)
Apr 13 15:14:08 rs211184 postfix/pipe[7504]: 116E523CA8C: to=<example#example.de>, relay=filter, delay=0.2, delays=0.16/0/0/0.04, dsn=2.0.0, status=sent (delivered via filter service)
Apr 13 15:14:08 rs211184 postfix/qmgr[7492]: 116E523CA8C: removed
Apr 13 15:14:08 rs211184 postfix-local[7522]: postfix-local: from=test#gmail.com, to=example#example.de, dirname=/var/qmail/mailnames
Apr 13 15:14:08 rs211184 postfix/pipe[7521]: 3FFDF23CB5F: to=<dsehlhoff#lcdev1.de>, relay=plesk_virtual, delay=0.02, delays=0.01/0/0/0.01, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Apr 13 15:14:08 rs211184 postfix/qmgr[7492]: 3FFDF23CB5F: removed

Answer 1

You seem to expect the message in a file, and oddly a static file name, but that's not how it works. The message arrives on standard input. Minimally, just remove /path/to/message-file -- but really, piping sed to sed is very often a mistake; you should refactor this to a single sed script (or Awk, or Python, or what have you).
sed -e ':a;N;$!ba;s/=\n//g' -e 's/</\n\</g' |
# This is too convoluted, really!
sed -r '/'"$(sed -r 's/\\/\\\\/g;s/\//\\\//g;s/\^/\\^/g;s/\[/\\[/g;s/'\''/'\'"\\\\"\'\''/g;s/\]/\\]/g;s/\*/\\*/g;s/\$/\\$/g;s/\./\\./g' whitelist |
paste -s -d '|')"'/! s/http/httx/g'