Get data from Home Assistant

If you want to get some data from Home Assistant, you can easily fetch them via the Home Assistant API:

Here is some go code that does this:

var haToken = "<yourHomeAssistantToken>"
var haUrl = "<yourHomeAssistantUrl>" // eg. https://my-homeassistant.com

type HomeAssistantStateEntity struct {
	EntityId    string                 `json:"entity_id"`
	State       string                 `json:"state"`
	Attributes  map[string]interface{} `json:"attributes"`
	LastChanged time.Time              `json:"last_changed"`
	LastUpdated time.Time              `json:"last_updated"`
	Context     struct {
		Id       string `json:"id"`
		ParentId string `json:"parent_id"`
		UserId   string `json:"user_id"`
	} `json:"context"`
}

func getHomeAssistantValue(entityId string) (string, error) {
	url := fmt.Sprintf("%s/api/states/%s", haUrl, entityId)

	req, err := http.NewRequestWithContext(context.Background(), http.MethodGet, url, nil)
	if err != nil {
		return "", err
	}
	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", haToken))

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	var data HomeAssistantStateEntity
	err = json.NewDecoder(resp.Body).Decode(&data)
	if err != nil {
		return "", err
	}

	return data.State, nil
}