[Postfix, Web] Feature: Show last SMTP login

data/Dockerfiles/postfix/smtpd_last_login.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Do not attempt to write to slave
+if [[ ! -z ${REDIS_SLAVEOF_IP} ]]; then
+  REDIS_CMDLINE="redis-cli -h ${REDIS_SLAVEOF_IP} -p ${REDIS_SLAVEOF_PORT}"
+else
+  REDIS_CMDLINE="redis-cli -h redis -p 6379"
+fi
+
+while read QUERY; do
+  QUERY=($QUERY)
+  # If nothing matched, end here - Postfix last line will be empty
+  if [[ -z "$(echo ${QUERY[0]} | tr -d '\040\011\012\015')" ]]; then
+    echo -ne "action=dunno\n\n"
+  # We found a username, log and return
+  elif [[ "${QUERY[0]}" =~ sasl_username ]]; then
+    ${REDIS_CMDLINE} SET "last-login/smtp/$(echo ${QUERY[0]#sasl_username=})" "$(date +%s)"
+    echo -ne "action=dunno\n\n"
+  fi
+done