From 583ff47c37bd41e695ac511af6330da3e02a5bf7 Mon Sep 17 00:00:00 2001 From: John Bowdre Date: Mon, 11 Sep 2023 17:40:19 -0500 Subject: [PATCH] update draft --- .../index.md | 179 +++++++++++++++++- 1 file changed, 177 insertions(+), 2 deletions(-) diff --git a/content/posts/easy-push-notifications-with-ntfy/index.md b/content/posts/easy-push-notifications-with-ntfy/index.md index 17aa78d..32e9eb3 100644 --- a/content/posts/easy-push-notifications-with-ntfy/index.md +++ b/content/posts/easy-push-notifications-with-ntfy/index.md @@ -3,7 +3,7 @@ title: "Easy Push Notifications With ntfy.sh" date: 2023-09-11 # lastmod: 2023-09-11 draft: true -description: "Deploying and configuring a self-hosted pub-sub notification handler, and getting another server to send a notifcation when it boots." +description: "Deploying and configuring a self-hosted pub-sub notification handler, getting another server to send a notifcation when it boots, and integrating the notification handler in Home Assistant." featured: false toc: true comment: true @@ -14,9 +14,184 @@ tags: - automation - containers - docker - - homelab + - homeassistant - linux - rest + - selfhosting - shell --- +Wouldn't it be great if there was a simple way to send a notification to your phone(s) with a simple `curl` call? Then you could get notified when a script completes, or a server reboots, a user logs in to a system, or a sensor connected to Home Assistant changes state. How great would that be?? + +[ntfy.sh](https://ntfy.sh) (pronounced *notify*) provides just that. It's an [open-source](https://github.com/binwiederhier/ntfy), easy-to-use, HTTP-based [pub-sub](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern) notification service, and it can notify using either mobile apps for Android ([Play](https://play.google.com/store/apps/details?id=io.heckel.ntfy) or [F-Droid](https://f-droid.org/en/packages/io.heckel.ntfy/)) or iOS ([App Store](https://apps.apple.com/us/app/ntfy/id1625396347)) or a [web app](https://ntfy.sh/app). I thought it sounded pretty compelling - and *then* I notice that [ntfy's docs](https://docs.ntfy.sh/install/) made it sound really easy to self-host the server component. + +So let's take it for a spin! + +## Installation +I'm going to use the [Docker setup](https://docs.ntfy.sh/install/#docker) on an existing cloud server and use [Caddy](https://caddyserver.com/) as a reverse proxy.[^caddy] + +So I'll start by creating a new directory at `/opt/ntfy/` to hold the goods, and create a compose config. +`/opt/ntfy/docker-compose.yml`: +```yaml +version: "2.3" + +services: + ntfy: + image: binwiederhier/ntfy + container_name: ntfy + command: + - serve + environment: + - TZ=UTC # optional: set desired timezone + volumes: + - ./cache/ntfy:/var/cache/ntfy + - ./etc/ntfy:/etc/ntfy + - ./lib/ntf:/var/lib/ntfy + ports: + - 8080:80 + healthcheck: # optional: remember to adapt the host:port to your environment + test: ["CMD-SHELL", "wget -q --tries=1 http://localhost:8080/v1/health -O - | grep -Eo '\"healthy\"\\s*:\\s*true' || exit 1"] + interval: 60s + timeout: 10s + retries: 3 + start_period: 40s + restart: unless-stopped +``` + +This config will create/mount folders in the working directory to store the ntfy cache and config + + +I can go ahead and bring it up: +```shell +sudo docker-compose up -d +``` + +I'll also want to add the following to my Caddy config: +`/etc/caddy/Caddyfile`: +``` +ntfy.example.com, http://ntfy.example.com { + reverse_proxy localhost:8080 + @httpget { + protocol http + method GET + path_regexp ^/([-_a-z0-9]{0,64}$|docs/|static/) + } + redir @httpget https://{host}{uri} +} +``` + +And I'll restart Caddy to apply the config: +```shell +sudo systemctl restart caddy +``` + +[^caddy]: I'm a big fan of Caddy. It may not be quite as capable/flexible as `nginx` but I love how simple it makes most configurations. Using Caddy in this will will not only enable HTTPS for the new web service but will also automatically obtain/renew LetsEncrypt certs so that I don't even have to think about it. + +## Configuration +`/opt/ntfy/etc/ntfy/server.yml`: +```yaml +auth-file: "/var/lib/ntfy/user.db" +auth-default-access: "deny-all" +base-url: "https://ntfy.example.com" +``` + +```shell +sudo docker-compose down && sudo docker-compose up -d +sudo docker exec -it ntfy /bin/sh +ntfy user add --role=admin admin_user +ntfy user add writer +ntfy token add writer +ntfy access writer ping write-only +``` + +## Usage + +```shell +curl \ + -u "writer:$password" \ + -d "My first notification" \ + https://ntfy.example.com/ping + +curl \ + -H "Authorization: Bearer $token" \ + -H "Title: Here's a Message Title" \ + -d "This is the message body" \ + https://ntfy.example.com/ping +``` + +### Notify on boot + +`/usr/local/bin/ntfy_push.sh`: +```shell +#!/usr/bin/env bash + +curl \ + -H "Authorization: Bearer $TOKEN" \ + -H "Title: $1" \ + -d "$2" \ + https://ntfy.example.com/ping +``` + +`/usr/local/bin/ntfy_boot_complete.sh`: +```shell +#!/usr/bin/env bash + +TITLE="$(hostname -s)" +MESSAGE="System boot complete" + +/usr/local/bin/ntfy_push.sh "$TITLE" "$MESSAGE" +``` + +`/etc/systemd/system/ntfy_boot_complete.service`: +``` +[Unit] +After=network.target + +[Service] +ExecStart=/usr/local/bin/ntfy_boot_complete.sh + +[Install] +WantedBy=default.target +``` + +```shell +sudo systemctl daemon-reload +sudo systemctl enable --now ntfy_boot_complete.service +``` + +### Home Assistant +`configuration.yaml`: +```yaml +notify: + - name: ntfy + platform: rest + method: POST_JSON + authentication: basic + username: writer + password: $PASSWORD + data: + topic: ping + title_param_name: title + message_param_name: message + resource: https://ntfy.example.com +``` + +`automations.yaml`: +```yaml +- alias: Water Leak Detection + description: '' + trigger: + - platform: state + entity_id: + - binary_sensor.water_6 + - binary_sensor.water_3 + - binary_sensor.water_5 + from: 'off' + to: 'on' + condition: [] + action: + - service: notify.ntfy + data: + title: Leak detected! + message: '{{ trigger.to_state.attributes.friendly_name }} detected.' +``` \ No newline at end of file