#!/usr/bin/env bash
## render-shared-ols-config.sh — assemble httpd_config.conf for the shared-ols
## tier from the per-site files the WHP panel drops into $SITES_ROOT.
##
## WHY THIS EXISTS: OpenLiteSpeed has NO top-level `include` directive (unlike
## Apache's IncludeOptional that shared-httpd relies on). So we cannot just drop
## per-vhost files in a dir and have OLS pick them up — the listener `map` lines
## and the vhost stanzas must live IN httpd_config.conf. This script is the
## "include" OLS lacks: it concatenates the panel's per-site pieces into one
## valid httpd_config.conf, then the caller issues `lswsctrl restart`.
## (Empirically established 2026-06-10 — see the OLS-tier PoC.)
##
## Per-site contract — the panel writes, for each site, a directory:
##   $SITES_ROOT/<vhname>/vhconf.conf   (rendered from configs/shared-ols/vhconf.tpl)
##   $SITES_ROOT/<vhname>/site.meta     (shell: VHNAME, VHROOT, DOMAINS="a.com,www.a.com")
## This script turns each into a `virtualhost {configFile}` stanza + a listener
## `map` line. A site dir missing either file is skipped (logged).
##
## Idempotent: always rebuilds from the stock config, so re-runs never compound.
set -euo pipefail

LSWS_CONF=/usr/local/lsws/conf
TPL_DIR=${TPL_DIR:-/etc/shared-ols-templates}
SITES_ROOT=${SITES_ROOT:-$LSWS_CONF/shared-sites}
LSCACHE_ROOT=${LSCACHE_ROOT:-/var/lscache}
CERT_FILE=${CERT_FILE:-$LSWS_CONF/cert/shared-ols.crt}
KEY_FILE=${KEY_FILE:-$LSWS_CONF/cert/shared-ols.key}
export LSCACHE_ROOT

OUT="$LSWS_CONF/httpd_config.conf"
STOCK="/usr/local/lsws/.conf/httpd_config.conf"

mkdir -p "$SITES_ROOT" "$LSCACHE_ROOT"

## --- 1. start from a pristine stock config (idempotent) ---
if [ ! -f "$STOCK" ]; then
  ## Some image builds keep the only copy at conf/; snapshot it once so future
  ## renders have a clean base to strip.
  mkdir -p "$(dirname "$STOCK")"
  cp "$OUT" "$STOCK"
fi

## --- 2. strip stock blocks that conflict or would run PHP LOCALLY ---
## extProcessor lsphp (autoStart 1, uds) + the server scriptHandler are removed
## so this server NEVER executes PHP itself — all PHP goes to remote sidecars.
## listener HTTP/HTTPS + vhTemplate docker are removed (we add our own).
awk '
  /^listener HTTP \{/      { skip=1; next }
  /^listener HTTPS \{/     { skip=1; next }
  /^vhTemplate docker ?\{/ { skip=1; next }
  /^extProcessor lsphp ?\{/{ skip=1; next }
  /^scriptHandler ?\{/     { skip=1; next }
  skip && /^\}/            { skip=0; next }
  !skip                    { print }
' "$STOCK" > "$OUT"

## --- 3. append our server-level base (real-IP, cache module, no local PHP) ---
{
  echo ""
  envsubst '${LSCACHE_ROOT}' < "$TPL_DIR/httpd_config_base.tpl"
} >> "$OUT"

## --- 4. emit per-site vhost stanzas + collect listener map lines ---
maps=""
site_count=0
for meta in "$SITES_ROOT"/*/site.meta; do
  [ -e "$meta" ] || continue
  sdir=$(dirname "$meta")
  VHNAME=""; VHROOT=""; DOMAINS=""
  # shellcheck source=/dev/null
  . "$meta"
  if [ -z "$VHNAME" ] || [ -z "$VHROOT" ] || [ -z "$DOMAINS" ] || [ ! -f "$sdir/vhconf.conf" ]; then
    echo "render-shared-ols: skipping $sdir (incomplete: VHNAME/VHROOT/DOMAINS/vhconf.conf)" >&2
    continue
  fi
  {
    echo ""
    echo "virtualhost ${VHNAME} {"
    echo "  vhRoot                  ${VHROOT}"
    echo "  configFile              ${sdir}/vhconf.conf"
    echo "  allowSymbolLink         1"
    echo "  enableScript            1"
    echo "  restrained              1"
    echo "}"
  } >> "$OUT"
  maps="${maps}  map ${VHNAME} ${DOMAINS}"$'\n'
  site_count=$((site_count + 1))
done

## --- 5. ALWAYS add a health vhost mapped to the catch-all so the server is
## valid with zero customer sites and HAProxy health checks (which hit by IP /
## unknown Host) get a 200. Exact-domain maps above win over this '*'. ---
{
  echo ""
  echo "virtualhost _health {"
  echo "  vhRoot                  /usr/local/lsws/shared-ols-health"
  echo "  configFile              /usr/local/lsws/shared-ols-health/vhconf.conf"
  echo "  allowSymbolLink         1"
  echo "  enableScript            0"
  echo "}"
} >> "$OUT"
maps="${maps}  map _health *"$'\n'

## --- 6. listeners (HTTP :80 + HTTPS :443 self-signed) carrying ALL maps.
## HAProxy terminates real TLS and connects to this tier on :443 ssl verify
## none (same as shared-httpd), so :443 needs a cert — self-signed is fine. ---
{
  echo ""
  echo "listener shared_http {"
  echo "  address                 *:80"
  echo "  secure                  0"
  printf '%s' "$maps"
  echo "}"
  echo ""
  echo "listener shared_https {"
  echo "  address                 *:443"
  echo "  secure                  1"
  echo "  keyFile                 ${KEY_FILE}"
  echo "  certFile                ${CERT_FILE}"
  printf '%s' "$maps"
  echo "}"
} >> "$OUT"

chown -R lsadm:nogroup "$LSWS_CONF" 2>/dev/null || true
echo "render-shared-ols: wrote $OUT ($site_count customer vhost(s) + health)"