Add example on how to use Home Assistant to control Pi-hole enable and disable through automations

Signed-off-by: DL6ER <dl6er@dl6er.de>

docs/guides/misc/homeassistant.md

@@ -0,0 +1,135 @@
+# Automating your Pi-hole with Home Assistant
+
+Home Assistant is an open-source home automation platform. It is able to track and control all devices at home and offer a platform for automating control. This guide will show you some examples how to integrate Pi-hole's API with Home Assistant. Feel free to adapt the examples to your needs.
+
+## Prerequisites
+
+- A running Home Assistant instance
+- Pi-hole installed and running
+
+## Example 1: Use a boolean switch to enable/disable Pi-hole blocking
+<!-- markdownlint-disable MD032 MD031 -->
+1. Add to your [`secrets.yaml`](https://www.home-assistant.io/docs/configuration/secrets/):
+   ```yaml
+   pi_hole_password: "your_pihole_password"
+   pi_hole_api_url: "http://192.168.1.2/api"
+   ```
+2. Add to your [`configuration.yaml`](https://www.home-assistant.io/docs/configuration/):
+   ```yaml
+   rest_command:
+     pihole_login:
+       url: '{{ api_url }}/auth'
+       method: POST
+       payload: '{ "password" : "{{ password }}" }'
+       content_type:  'application/json; charset=utf-8'
+       verify_ssl: false
+     pihole_logout:
+       url: '{{ api_url }}/auth'
+       method: DELETE
+       verify_ssl: false
+       headers:
+         sid: "{{ sid }}"
+     pihole_set_blocking:
+       url: '{{ api_url }}/dns/blocking'
+       method: POST
+       payload: '{ "blocking" : {{ blocking }}, "timer" : {{ timer }} }'
+       content_type:  'application/json; charset=utf-8'
+       verify_ssl: false
+       headers:
+         sid: "{{ sid }}"
+
+   input_boolean:
+     pihole_blocking:
+       name: Pi-Hole Blocking
+       initial: on
+       icon: mdi:block-helper
+   ```
+3. Add to your [`scripts.yaml`](https://www.home-assistant.io/docs/scripts/):
+   ```yaml
+   pi_hole_disable:
+     sequence:
+       - action: rest_command.pihole_login
+         data:
+           api_url: !secret pi_hole_api_url
+           password: !secret pi_hole_password
+         response_variable: response
+       - condition: template
+         value_template: "{{ response['status'] == 200 }}"
+       - variables:
+           sid: "{{ response['content']['session']['sid'] }}"
+       - action: rest_command.pihole_set_blocking
+         data:
+           api_url: !secret pi_hole_api_url
+           sid: "{{ sid }}"
+           blocking: "false"
+           timer: "300" # can be "null" for permanent
+       - action: rest_command.pihole_logout
+         data:
+           api_url: !secret pi_hole_api_url
+           sid: "{{ sid }}"
+
+   pi_hole_enable:
+     sequence:
+       - action: rest_command.pihole_login
+         data:
+           password: !secret pi_hole_password
+           api_url: !secret pi_hole_api_url
+         response_variable: response
+       - condition: template
+         value_template: "{{ response['status'] == 200 }}"
+       - variables:
+           sid: "{{ response['content']['session']['sid'] }}"
+       - action: rest_command.pihole_set_blocking
+         data:
+           api_url: !secret pi_hole_api_url
+           sid: "{{ sid }}"
+           blocking: "true"
+           timer: "null"
+       - action: rest_command.pihole_logout
+         data:
+           api_url: !secret pi_hole_api_url
+           sid: "{{ sid }}"
+   ```
+4. Add to your [`automations.yaml`](https://www.home-assistant.io/docs/automation/):
+   ```yaml
+   - id: '1734339971405'
+     alias: Disable Pi-hole Blocking
+     description: ''
+     triggers:
+     - trigger: event
+       event_type: pi_hole_disable
+     - entity_id: input_boolean.pihole_blocking
+       to: 'off'
+       trigger: state
+     conditions: []
+     actions:
+     - action: script.pi_hole_disable
+       data: {}
+     mode: single
+   - id: '1734339971406'
+     alias: Enable Pi-hole Blocking
+     description: ''
+     triggers:
+     - trigger: event
+       event_type: pi_hole_enable
+     - entity_id: input_boolean.pihole_blocking
+       to: 'off'
+       trigger: state
+     conditions: []
+     actions:
+     - action: script.pi_hole_enable
+       data: {}
+     mode: single
+   ```
+
+You can use the created `input_boolean.pihole_blocking` to enable or disable Pi-hole blocking
+
+![Pi-hole Blocking](../../images/home-assistant/boolean.png)
+
+The `pi_hole_disable` script will disable Pi-hole blocking for 5 minutes, while the `pi_hole_enable` script will enable Pi-hole blocking permanently. We created two automations to trigger the scripts based on the state of the `input_boolean.pihole_blocking`, e.g., when the boolean is turned off, the `pi_hole_disable` script will be triggered:
+
+![Pi-hole Blocking Automation](../../images/home-assistant/automation.png)
+
+This automation may be enriched with additional triggers, e.g., automatically disable Pi-hole blocking when changing the color of a specific light to red and re-enable it when the light is turned back to green. You can also add a notification to inform you about the change.
+
+Note that this example does not check the status of Pi-hole before enabling or disabling blocking, i.e., in the mentioned example of a lamp changing color, the lamp will *not* change its color if Pi-hole's blocking state is changed elsewhere, e.g., from the web interface or the CLI.

mkdocs.yml

@@ -200,6 +200,7 @@ nav:
         - 'Optional: Dynamic DNS': guides/vpn/openvpn/dynDNS.md
         - 'Troubleshooting': guides/vpn/openvpn/troubleshooting.md
     - 'Misc':
+      - 'Home Assistant': guides/misc/homeassistant.md
       - 'Benchmarking': guides/misc/benchmark.md
       - 'Tor & Pi-hole':
         - 'Tor & Pi-hole': guides/misc/tor/index.md