#!/usr/bin/env bash

# ---
# Nextcloud High Performance Backend für Dateien (notify_push) einrichten
# ---


# see:
#     https://github.com/nextcloud/notify_push
#     https://apfelcast.com/nextcloud-high-performance-backend-fuer-dateien-einrichten-schritt-fuer-schritt-anleitung/
#     https://www.youtube.com/watch?v=jMCI7hFAU1Y

HTTP_USER="www-data"

PHP_BIN="/usr/local/php/bin/php"

PHP_VERSION=8.3

# 0   Requirements
# ================
#
#     - Nextcloud auf LAMP/LEMP Stack
#       LAMP - (Linux Apache MySQL PHP)
#       LEMP - (Linux Nginx MySQL PHP)
#
#     - Redis Memory Caching Service

WEBSITE="cloud-test.oopen.de"
WEBSITE="cloud-02-test.oopen.de"
WEBSITE="cloud-01.oopen.de"
WEBSITE="cloud-test-01.oopen.de"

WEB_BASE_DIR="/var/www/${WEBSITE}"
NC_INSTALL_DIR="${WEB_BASE_DIR}/nextcloud"

IPv4="$(dig +short "${WEBSITE}" A)"
IPv6="$(dig +short "${WEBSITE}" AAAA)"

# 1   Install NC App 'Client Push"
# ================================
#
#     Instead of using the 'occ' command, the 'Client Push' APP 
#     can also be installed via the Nextcloud web interface (Nextcloud Appstore).
#
sudo -u ${HTTP_USER} ${PHP_BIN} ${WEB_BASE_DIR}/htdocs/occ app:install notify_push


# 2   Configure ReversProxy 
# =========================
#

# 2a  Apache
#
a2enmod proxy
a2enmod proxy_http
a2enmod proxy_wstunnel


# Add to your apache2 vhost configuration
#
#   ProxyPass /push/ws ws://127.0.0.1:7867/ws
#   ProxyPass /push/ http://127.0.0.1:7867/
#   ProxyPassReverse /push/ http://127.0.0.1:7867/


# restart apache2
#
systemctl restart apache2


# 2b  Nginx

# Add to your nginx vhost configuration
#
#   location ^~ /push/ {
#      proxy_pass http://127.0.0.1:7867/;
#      proxy_http_version 1.1;
#      proxy_set_header Upgrade $http_upgrade;
#      proxy_set_header Connection "Upgrade";
#      proxy_set_header Host $host;
#      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
   }

# reload nginx
#
nginx -s reload


# 3   Configure NC - add truzsted proxy (IPv4 AND if exists IPv6 address to trusted proxies)
# ==========================================================================================
#
#     'trusted_proxies' =>
#     array (
#        0 => '${IPv4}',
#        1 => '${IPv6}',
#     )
_parameter="trusted_proxies"
_type="string"
_value="${IPv4}"
sudo -u ${HTTP_USER} ${PHP_BIN} ${WEB_BASE_DIR}/htdocs/occ config:system:set ${_parameter} 0 \
   --value="${_value}" --type="${_type}"

_value="${IPv6}"
sudo -u ${HTTP_USER} ${PHP_BIN} ${WEB_BASE_DIR}/htdocs/occ config:system:set ${_parameter} 1 \
   --value="${_value}" --type="${_type}"

systemctl restart php-${PHP_VERSION}-fpm


# 4   Create Service 'notify_push'
# ================================
#
# Metrics
#
# The push server can expose some basic metrics about the number of connected clients and 
# the traffic flowing through the server by setting the METRICS_PORT environment variable.
#
# Once set the metrics are available in a prometheus compatible format at /metrics on the 
# configured port. Inside the service file set:
#
#     Environment=METRICS_PORT=7868
#
# Run 'curl http://localhost:7868/metrics
#
# Additionally you can manually check the metrics by running the occ notify_push:metrics 
# command, this will function even if you haven't setup METRICS_PORT.
#
cat <<EOF > /etc/systemd/system/notify_push.service
[Unit]
Description = Push daemon for Nextcloud clients
Documentation=https://github.com/nextcloud/notify_push

[Service]
# Change if you already have something running on this port
Environment=PORT=7867
# Run 'curl http://localhost:7868/metrics' to eee some metrivcs
Environment=METRICS_PORT=7868
Environment=NEXTCLOUD_URL=https://${WEBSITE}
ExecStart=${NC_INSTALL_DIR}/apps/notify_push/bin/x86_64/notify_push ${NC_INSTALL_DIR}/config/config.php
# requires the push server to have been build with the systemd feature (enabled by default)
Type=notify
User=${HTTP_USER}
Restart=always
RestartSec=60

[Install]
WantedBy = multi-user.target
EOF

# enable service at boot time
#
systemctl daemon-reload
systemctl enable --now notify_push
systemctl start notify_push


# 5.  Testing and final Nextcloud configuration
# =============================================
#
sudo -u ${HTTP_USER} ${PHP_BIN} ${WEB_BASE_DIR}/htdocs/occ notify_push:setup


systemctl restart php-8.3-fpm.service