#!/bin/bash
set -e
TS=$(date +%s)
echo "=== backups ==="
cp /etc/postfix/master.cf /etc/postfix/master.cf.bak.$TS
cp /etc/postfix/main.cf   /etc/postfix/main.cf.bak.$TS
cp /etc/postfix/transport /etc/postfix/transport.bak.$TS
echo "backed up (.$TS)"

echo "=== master.cf: yahooslow bind .90 + add out02..out20 ==="
python3 - <<'PY'
mc = open('/etc/postfix/master.cf').read()
if 'smtp_bind_address=207.174.124.90' not in mc:
    out=[]; iny=False
    for ln in mc.split('\n'):
        out.append(ln)
        if ln.startswith('yahooslow '): iny=True
        elif iny and 'smtp_destination_recipient_limit=1' in ln:
            out.append('  -o smtp_bind_address=207.174.124.90')
            out.append('  -o smtp_helo_name=mta01.performancewest.net')
            iny=False
    mc='\n'.join(out)
if 'out02 unix' not in mc:
    b=['','# === Warmup rotation pool (.91-.109 / mta02-mta20) ===']
    for i in range(2,21):
        octet=89+i; name='out%02d'%i; helo='mta%02d.performancewest.net'%i
        b += ['%s unix - - n - - smtp'%name,
              '  -o smtp_bind_address=207.174.124.%d'%octet,
              '  -o smtp_helo_name=%s'%helo,
              '  -o syslog_name=postfix/%s'%name,
              '  -o smtp_destination_concurrency_limit=2',
              '  -o smtp_destination_rate_delay=2s',
              '  -o smtp_destination_recipient_limit=2']
    mc=mc.rstrip('\n')+'\n'+'\n'.join(b)+'\n'
open('/etc/postfix/master.cf','w').write(mc)
print('  master.cf updated')
PY

echo "=== transport: yahoo/aol/yahoo-ISPs -> yahooslow; gmail/outlook removed (rotate) ==="
cat > /etc/postfix/transport <<'EOF'
# Yahoo/AOL + Yahoo-hosted ISPs -> dedicated .90 trickle (yahooslow). Everything
# else falls through transport_maps to the randmap rotation pool.
yahoo.com       yahooslow:
ymail.com       yahooslow:
rocketmail.com  yahooslow:
aol.com         yahooslow:
att.net         yahooslow:
sbcglobal.net   yahooslow:
bellsouth.net   yahooslow:
verizon.net     yahooslow:
frontier.com    yahooslow:
frontiernet.net yahooslow:
EOF
/usr/sbin/postmap /etc/postfix/transport
echo "  transport rebuilt"

echo "=== install warmup scheduler + stamp start + set phase-1 pool ==="
cp /tmp/pw-mta-warmup.sh /usr/local/bin/pw-mta-warmup
chmod +x /usr/local/bin/pw-mta-warmup
/usr/local/bin/pw-mta-warmup --start

echo "=== postfix check (gate) ==="
if /usr/sbin/postfix check 2>&1; then
  echo "CHECK OK"; /usr/sbin/postfix reload && echo "RELOADED"
else
  echo "CHECK FAILED — rolling back"
  cp /etc/postfix/master.cf.bak.$TS /etc/postfix/master.cf
  cp /etc/postfix/main.cf.bak.$TS   /etc/postfix/main.cf
  cp /etc/postfix/transport.bak.$TS /etc/postfix/transport
  /usr/sbin/postmap /etc/postfix/transport
  /usr/sbin/postfix reload
  echo "ROLLED BACK"; exit 1
fi

echo "=== cron (daily warmup advance) ==="
echo '17 7 * * * root /usr/local/bin/pw-mta-warmup >> /var/log/pw-mta-warmup.log 2>&1' > /etc/cron.d/pw-mta-warmup
echo "=== final transport_maps ==="
/usr/sbin/postconf -h transport_maps
echo "=== out transport count ==="
grep -cE "^out[0-9]+ unix" /etc/postfix/master.cf