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c4ee09ef46
Improved English; original probably written by someone using second language which is far more impressive than me slightly tweaking it in my first language!
484 lines
15 KiB
Markdown
484 lines
15 KiB
Markdown
---
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title: RESTful
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description: Instructions on how to integrate REST sensors into Home Assistant.
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ha_category:
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- Sensor
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ha_release: 0.7.4
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ha_iot_class: Local Polling
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ha_domain: rest
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---
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The `rest` sensor platform is consuming a given endpoint which is exposed by a [RESTful API](https://en.wikipedia.org/wiki/Representational_state_transfer) of a device, an application, or a web service. The sensor has support for GET and POST requests.
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To enable this sensor, add the following lines to your `configuration.yaml` file for a GET request:
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```yaml
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# Example configuration.yaml entry
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sensor:
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- platform: rest
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resource: http://IP_ADDRESS/ENDPOINT
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```
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or for a POST request:
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```yaml
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# Example configuration.yaml entry
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sensor:
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- platform: rest
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resource: http://IP_ADDRESS/ENDPOINT
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method: POST
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payload: '{ "device" : "heater" }'
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```
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or a template based request:
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{% raw %}
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```yaml
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# Example configuration.yaml entry
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sensor:
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- platform: rest
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resource_template: http://IP_ADDRESS/{{ now().strftime('%Y-%m-%d') }}
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```
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{% endraw %}
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{% configuration %}
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resource:
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description: The resource or endpoint that contains the value.
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required: true
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type: string
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resource_template:
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description: The resource or endpoint that contains the value with template support.
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required: true
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type: template
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method:
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description: The method of the request. Either `POST` or `GET`.
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required: false
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type: string
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default: GET
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name:
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description: Name of the REST sensor.
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required: false
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type: string
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default: REST Sensor
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device_class:
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description: Sets the [class of the device](/integrations/sensor/), changing the device state and icon that is displayed on the frontend.
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required: false
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type: string
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value_template:
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description: "Defines a [template](/docs/configuration/templating/#processing-incoming-data) to extract the value."
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required: false
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type: template
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payload:
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description: The payload to send with a POST request. Depends on the service, but usually formed as JSON.
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required: false
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type: string
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verify_ssl:
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description: Verify the SSL certificate of the endpoint.
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required: false
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type: boolean
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default: True
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timeout:
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description: Defines max time to wait data from the endpoint.
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required: false
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type: integer
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default: 10
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unit_of_measurement:
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description: Defines the units of measurement of the sensor, if any.
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required: false
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type: string
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authentication:
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description: Type of the HTTP authentication. `basic` or `digest`.
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required: false
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type: string
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username:
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description: The username for accessing the REST endpoint.
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required: false
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type: string
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password:
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description: The password for accessing the REST endpoint.
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required: false
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type: string
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headers:
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description: The headers for the requests.
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required: false
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type: [string, list]
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json_attributes:
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description: A list of keys to extract values from a JSON dictionary result and then set as sensor attributes. If the endpoint returns XML with the "text/xml" or "application/xml" content type, it will automatically be converted to JSON according to this [specification](https://www.xml.com/pub/a/2006/05/31/converting-between-xml-and-json.html)
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required: false
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type: [string, list]
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json_attributes_path:
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description: A [JSONPath](https://goessner.net/articles/JsonPath/) that references the location of the `json_attributes` in the JSON content.
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required: false
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type: string
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force_update:
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description: Sends update events even if the value hasn't changed. Useful if you want to have meaningful value graphs in history.
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required: false
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type: boolean
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default: false
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{% endconfiguration %}
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<div class='note'>
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Use either `resource` or `resource_template`.
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</div>
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`curl` can help you identify the variable you want to display in your Home Assistant frontend. The example below shows the JSON response of a device that is running with [aREST](https://arest.io/).
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```bash
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$ curl -X GET http://192.168.1.31/temperature/
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{"temperature": 77, "id": "sensor02", "name": "livingroom", "connected": true}
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```
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The response is expected to be a dictionary or a list with a dictionary as its 0th element.
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## Examples
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In this section you find some real-life examples of how to use this sensor.
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### External IP address
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You can find your external IP address using the service [JSON Test](https://www.jsontest.com/) at their [http://ip.jsontest.com/](http://ip.jsontest.com/) URL.
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```yaml
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sensor:
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- platform: rest
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resource: http://ip.jsontest.com
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name: External IP
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value_template: '{% raw %}{{ value_json.ip }}{% endraw %}'
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```
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### Single value from a local Glances instance
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The [glances](/integrations/glances) sensor is doing the exact same thing for all exposed values.
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```yaml
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sensor:
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- platform: rest
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resource: http://IP_ADRRESS:61208/api/2/mem/used
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name: Used mem
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value_template: '{% raw %}{{ value_json.used| multiply(0.000000954) | round(0) }}{% endraw %}'
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unit_of_measurement: MB
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```
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### Value from another Home Assistant instance
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The Home Assistant [API](/developers/rest_api/) exposes the data from your attached sensors. If you are running multiple Home Assistant instances which are not [connected](/developers/architecture/#multiple-connected-instances) you can still get information from them.
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If the Home Assistant instance in the resource variable is protected by an API password, you can append `?api_password=YOUR_PASSWORD` to the resource URL to authenticate or use `headers:`.
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```yaml
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sensor:
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- platform: rest
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resource: http://IP_ADDRESS:8123/api/states/sensor.weather_temperature
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name: Temperature
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value_template: {% raw %}'{{ value_json.state }}'{% endraw %}
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unit_of_measurement: "°C"
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```
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### Accessing an HTTP authentication protected endpoint
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The REST sensor supports HTTP authentication and customized headers.
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```yaml
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sensor:
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- platform: rest
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resource: http://IP_ADDRESS:5000/sensor
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username: ha1
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password: test1
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authentication: basic
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headers:
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User-Agent: Home Assistant
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Content-Type: application/json
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```
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The headers will contain all relevant details. This will also give you the ability to access endpoints that are protected by tokens.
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```bash
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Content-Length: 1024
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Host: IP_ADDRESS1:5000
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Authorization: Basic aGExOnRlc3Qx
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Accept-Encoding: identity
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Content-Type: application/json
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User-Agent: Home Assistant
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```
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If you are accessing a resource protected by a `Bearer` token in an `Authorization` header, you can either put the token in the header field of the sensor configuration (not recommended) or store the token in your [`secrets.yaml`](/docs/configuration/secrets/) file. In that case, be sure to include the word `Bearer` in the `secrets` file.
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```yaml
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sensor:
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- platform: rest
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resource: http://IP_ADDRESS:5000/sensor
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headers:
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Authorization: !secret my_sensor_secret_token
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```
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Example entry for the `secrets.yaml` file:
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```yaml
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my_sensor_secret_token: Bearer gh_DHQIXKVf6Pr4H8Yqz8uhApk_mnV6Zje6Pr4H8Yqz8A8nCxz6SBghQdS51
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```
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### Use GitHub to get the latest release of Home Assistant
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This sample is very similar to the [`updater`](/integrations/updater/) integration but the information is received from GitHub.
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```yaml
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sensor:
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- platform: rest
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resource: https://api.github.com/repos/home-assistant/home-assistant/releases/latest
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username: YOUR_GITHUB_USERNAME
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password: YOUR_GITHUB_ACCESS_TOKEN
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authentication: basic
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value_template: '{% raw %}{{ value_json.tag_name }}{% endraw %}'
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headers:
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Accept: application/vnd.github.v3+json
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Content-Type: application/json
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User-Agent: Home Assistant REST sensor
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```
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### Fetch multiple JSON values and present them as attributes
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[JSON Test](https://www.jsontest.com/) returns the current time, date and milliseconds since epoch from [http://date.jsontest.com/](http://date.jsontest.com/).
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{% raw %}
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```yaml
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sensor:
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- platform: rest
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name: JSON time
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json_attributes:
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- date
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- milliseconds_since_epoch
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resource: http://date.jsontest.com/
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value_template: '{{ value_json.time }}'
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- platform: template
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sensors:
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date:
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friendly_name: 'Date'
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value_template: '{{ states.sensor.json_time.attributes["date"] }}'
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milliseconds:
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friendly_name: 'milliseconds'
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value_template: '{{ states.sensor.json_time.attributes["milliseconds_since_epoch"] }}'
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```
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{% endraw %}
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[JSONPlaceholder](https://jsonplaceholder.typicode.com/) provides sample JSON data for testing. In the below example, JSONPath locates the attributes in the JSON document. [JSONPath Online Evaluator](https://jsonpath.com/) provides a tool to test your JSONPath. If the endpoint returns XML, it will be converted to JSON using `xmltodict` before searching for attributes. You may find the [XMLtoDict debug tool](https://xmltodict-debugger.glitch.me/) helpful for testing how your XML converts to JSON.
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{% raw %}
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```yaml
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sensor:
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- platform: rest
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name: JSON users
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json_attributes_path: "$.[0].address"
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json_attributes:
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- street
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- suite
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- city
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- zipcode
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resource: https://jsonplaceholder.typicode.com/users
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value_template: '{{ value_json[0].name }}'
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```
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{% endraw %}
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This sample fetches a weather report from [OpenWeatherMap](https://openweathermap.org/), maps the resulting data into attributes of the RESTful sensor and then creates a set of [template](/integrations/template) sensors that monitor the attributes and present the values in a usable form.
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{% raw %}
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```yaml
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sensor:
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- platform: rest
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name: OWM_report
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json_attributes:
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- main
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- weather
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value_template: '{{ value_json["weather"][0]["description"].title() }}'
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resource: https://api.openweathermap.org/data/2.5/weather?zip=80302,us&APPID=VERYSECRETAPIKEY
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- platform: template
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sensors:
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owm_weather:
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value_template: '{{ state_attr('sensor.owm_report', 'weather')[0]["description"].title() }}'
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entity_picture_template: '{{ "https://openweathermap.org/img/w/"+state_attr('sensor.owm_report', 'weather')[0]["icon"].lower()+".png" }}'
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entity_id: sensor.owm_report
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owm_temp:
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friendly_name: 'Outside temp'
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value_template: '{{ state_attr('sensor.owm_report', 'main')["temp"]-273.15 }}'
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unit_of_measurement: "°C"
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entity_id: sensor.owm_report
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owm_pressure:
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friendly_name: 'Outside pressure'
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value_template: '{{ state_attr('sensor.owm_report', 'main')["pressure"] }}'
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unit_of_measurement: "hP"
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entity_id: sensor.owm_report
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owm_humidity:
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friendly_name: 'Outside humidity'
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value_template: '{{ state_attr('sensor.owm_report', 'main')["humidity"] }}'
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unit_of_measurement: "%"
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entity_id: sensor.owm_report
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```
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{% endraw %}
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This configuration shows how to extract multiple values from a dictionary with `json_attributes` and `template`. This avoids flooding the REST service by only requesting the result once, then creating multiple attributes from that single result using templates. By default, the sensor state would be set to the full JSON — here, that would exceed the 255-character maximum allowed length for the state, so we override that default by using `value_template` to set a static value of `OK`.
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{% raw %}
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```json
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{
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"bedroom1": {
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"temperature": 15.79,
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"humidity": 55.78,
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"battery": 5.26,
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"timestamp": "2019-02-27T22:21:37Z"
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},
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"bedroom2": {
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"temperature": 18.99,
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"humidity": 49.81,
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"battery": 5.08,
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"timestamp": "2019-02-27T22:23:44Z"
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},
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"bedroom3": {
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"temperature": 18.58,
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"humidity": 47.95,
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"battery": 5.15,
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"timestamp": "2019-02-27T22:21:22Z"
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}
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}
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```
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{% endraw %}
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{% raw %}
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```yaml
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sensor:
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- platform: rest
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name: room_sensors
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resource: http://<address_to_rest_service>
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json_attributes:
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- bedroom1
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- bedroom2
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- bedroom3
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value_template: 'OK'
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- platform: template
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sensors:
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bedroom1_temperature:
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value_template: '{{ states.sensor.room_sensors.attributes["bedroom1"]["temperature"] }}'
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device_class: temperature
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unit_of_measurement: '°C'
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bedroom1_humidity:
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value_template: '{{ states.sensor.room_sensors.attributes["bedroom1"]["humidity"] }}'
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device_class: humidity
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unit_of_measurement: '%'
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bedroom1_battery:
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value_template: '{{ states.sensor.room_sensors.attributes["bedroom1"]["battery"] }}'
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device_class: battery
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unit_of_measurement: 'V'
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bedroom2_temperature:
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value_template: '{{ states.sensor.room_sensors.attributes["bedroom2"]["temperature"] }}'
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device_class: temperature
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unit_of_measurement: '°C'
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```
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{% endraw %}
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The below example allows shows how to extract multiple values from a dictionary with `json_attributes` and `json_attributes_path` from the XML of a Steamist Steambath Wi-Fi interface and use them to create a switch and multiple sensors without having to poll the endpoint numerous times.
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In the below example `json_attributes_path` is set to `$.response` which is the location of the `usr0`, `pot0`, ... attributes used for `json_attributes`.
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{% raw %}
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```yaml
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sensor:
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# Steam Controller
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- platform: rest
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name: Steam System Data
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resource: http://192.168.1.105/status.xml
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json_attributes_path: "$.response"
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scan_interval: 15
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value_template: 'OK'
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json_attributes:
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- "usr0"
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- "pot0"
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- "temp0"
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- "time0"
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- platform: template
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sensors:
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steam_temp:
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friendly_name: Steam Temp
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value_template: '{{ states.sensor.steam_system_data.attributes["temp0"] | regex_findall_index("([0-9]+)XF") }}'
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unit_of_measurement: "°F"
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steam_time_remaining:
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friendly_name: "Steam Time Remaining"
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value_template: '{{ states.sensor.steam_system_data.attributes["time0"] }}'
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unit_of_measurement: "minutes"
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switch:
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- platform: template
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switches:
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steam:
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value_template: '{{ states.sensor.steam_system_data.attributes["usr0"] | int >= 1 }}'
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turn_on:
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- service: rest_command.set_steam_led
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data:
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led: 6
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- service: homeassistant.update_entity
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data:
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entity_id: sensor.steam_system_data
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- delay: 00:00:15
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- service: homeassistant.update_entity
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data:
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entity_id: sensor.steam_system_data
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turn_off:
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- service: rest_command.set_steam_led
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data:
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led: 7
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- service: homeassistant.update_entity
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data:
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entity_id: sensor.steam_system_data
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- delay: 00:00:15
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- service: homeassistant.update_entity
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data:
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entity_id: sensor.steam_system_data
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friendly_name: Steam
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rest_command:
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set_steam_led:
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url: http://192.168.1.105/leds.cgi?led={{ led }}
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```
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{% endraw %}
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For reference, the XML content of endpoint shown above example is below:
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```xml
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<?xml version="1.0" encoding="utf-8"?>
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<response>
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<scan>0</scan>
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<ver>12556</ver>
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<count>48</count>
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<ssid>alexander</ssid>
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<bss>
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<valid>0</valid>
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<name>0</name>
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<privacy>0</privacy>
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<wlan>0</wlan>
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<strength>0</strength>
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</bss>
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<led0>0</led0>
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<led1>0</led1>
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<led2>0</led2>
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<led3>0</led3>
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<led4>0</led4>
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<led5>0</led5>
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<led6>0</led6>
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<led7>0</led7>
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<btn0>up</btn0>
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<btn1>up</btn1>
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<btn2>up</btn2>
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<btn3>up</btn3>
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<pot0>0</pot0>
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<usr0>0</usr0>
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<temp0>0x73XF0x73XF</temp0>
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<time0> 0</time0>
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</response>
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```
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