#!/usr/bin/env bash
# Writes log lines in Nginx Proxy Manager format, like NPM would.
#
#   ./fake-npm-logs.sh scan     <ip> [count] [host-id] [log|logs]   4xx on scanner paths
#   ./fake-npm-logs.sh wplogin  <ip> [count] [host-id] [log|logs]   POST /wp-login.php
#   ./fake-npm-logs.sh harmless <ip> [count] [host-id] [log|logs]   404 /favicon.ico, 200 /
#   ./fake-npm-logs.sh fallback <ip> [count]                        444 on the default host
#   ./fake-npm-logs.sh newhost  <host-id> [log|logs]                empty log of a new proxy host

set -euo pipefail
cd "$(dirname "$0")"

cmd=${1:?command missing}
now() { date -u '+%d/%b/%Y:%H:%M:%S +0000'; }
proxy_line() { # status method path ip
  printf '[%s] - %s %s - %s https test.example.com "%s" [Client %s] [Length 150] [Gzip -] [Sent-to 172.16.52.10] "curl/8.5.0" "-"\n' \
    "$(now)" "$1" "$1" "$2" "$3" "$4"
}

case "$cmd" in
  scan|wplogin|harmless)
    ip=${2:?ip missing}; count=${3:-3}; host=${4:-1}; dir=npm-logs/${5:-log}
    file="$dir/proxy-host-${host}_access.log"
    mkdir -p "$dir"
    paths=(/.env /.git/config /phpinfo.php /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php /actuator/env)
    for ((i = 0; i < count; i++)); do
      case "$cmd" in
        scan)     proxy_line 404 GET "${paths[i % ${#paths[@]}]}" "$ip" ;;
        wplogin)  proxy_line 200 POST /wp-login.php "$ip" ;;
        harmless) proxy_line 404 GET /favicon.ico "$ip"; proxy_line 200 GET / "$ip" ;;
      esac >> "$file"
      sleep 0.2
    done
    echo "$cmd: $count × $ip -> $file"
    ;;
  fallback)
    ip=${2:?ip missing}; count=${3:-3}
    mkdir -p npm-logs/log
    for ((i = 0; i < count; i++)); do
      printf '%s - - [%s] "GET / HTTP/1.1" 444 0 "-" "curl/8.5.0"\n' "$ip" "$(now)" >> npm-logs/log/default-host_access.log
      sleep 0.2
    done
    echo "fallback: $count × $ip -> npm-logs/log/default-host_access.log"
    ;;
  newhost)
    host=${2:?host-id missing}; dir=npm-logs/${3:-log}
    mkdir -p "$dir"
    touch "$dir/proxy-host-${host}_access.log"
    echo "newhost: $dir/proxy-host-${host}_access.log"
    ;;
  *)
    sed -n '2,9p' "$0"; exit 1 ;;
esac