Rest API

Home Assistent runs a webserver accessible on port 8123.

• http://127.0.0.1:8123/ is an interface to control Home Assistant.
• http://localhost:8123/api/ is a Rest API.

In the package homeassistant.remote a Python API on top of the HTTP API can be found.

The API accepts and returns only JSON encoded objects. All API calls have to be accompanied by the header X-HA-Access: YOUR_PASSWORD (as specified in your home-assistant.conf).

Successful calls will return status code 200 or 201. Other status codes that can return are:

• 400 (Bad Request)
• 401 (Unauthorized)
• 404 (Not Found)
• 405 (Method not allowed)

The api supports the following actions:

/api - GET
Returns message if API is up and running.

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{
  "message": "API running."
}

/api/events - GET
Returns an array of event objects. Each event object contain event name and listener count.

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[
    {
      "event": "state_changed",
      "listener_count": 5
    },
    {
      "event": "time_changed",
      "listener_count": 2
    }
]

/api/services - GET
Returns an array of service objects. Each object contains the domain and which services it contains.

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[
    {
      "domain": "browser",
      "services": [
        "browse_url"
      ]
    },
    {
      "domain": "keyboard",
      "services": [
        "volume_up",
        "volume_down"
      ]
    }
]

/api/states - GET
Returns an array of state objects. Each state has the following attributes: entity_id, state, last_changed and attributes.

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[
    {
        "attributes": {
            "next_rising": "07:04:15 29-10-2013",
            "next_setting": "18:00:31 29-10-2013"
        },
        "entity_id": "sun.sun",
        "last_changed": "23:24:33 28-10-2013",
        "state": "below_horizon"
    },
    {
        "attributes": {},
        "entity_id": "process.Dropbox",
        "last_changed": "23:24:33 28-10-2013",
        "state": "on"
    }
]

/api/states/<entity_id> - GET
Returns a state object for specified entity_id. Returns 404 if not found.

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{
    "attributes": {
        "next_rising": "07:04:15 29-10-2013",
        "next_setting": "18:00:31 29-10-2013"
    },
    "entity_id": "sun.sun",
    "last_changed": "23:24:33 28-10-2013",
    "state": "below_horizon"
}

/api/states/<entity_id> - POST
Updates or creates the current state of an entity.

Return code is 200 if the entity existed, 201 if the state of a new entity was set. A location header will be returned with the url of the new resource. The response body will contain a JSON encoded State object.

parameter: state - string
optional parameter: attributes - JSON object

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{
    "attributes": {
        "next_rising": "07:04:15 29-10-2013",
        "next_setting": "18:00:31 29-10-2013"
    },
    "entity_id": "weather.sun",
    "last_changed": "23:24:33 28-10-2013",
    "state": "below_horizon"
}

/api/events/<event_type> - POST
Fires an event with event_type
optional body: JSON encoded object that represents event_data

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{
    "message": "Event download_file fired."
}

/api/services/<domain>/<service> - POST
Calls a service within a specific domain. Will return when the service has been executed or 10 seconds has past, whichever comes first.
optional body: JSON encoded object that represents service_data

Returns a list of states that have changed since the start of this service call.

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[
    {
        "attributes": {
            "next_rising": "07:04:15 29-10-2013",
            "next_setting": "18:00:31 29-10-2013"
        },
        "entity_id": "sun.sun",
        "last_changed": "23:24:33 28-10-2013",
        "state": "below_horizon"
    },
    {
        "attributes": {},
        "entity_id": "process.Dropbox",
        "last_changed": "23:24:33 28-10-2013",
        "state": "on"
    }
]

/api/event_forwarding - POST
Setup event forwarding to another Home Assistant instance.
parameter: host - string
parameter: api_password - string
optional parameter: port - int

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{
    "message": "Event forwarding setup."
}

/api/event_forwarding - DELETE
Cancel event forwarding to another Home Assistant instance.
parameter: host - string
optional parameter: port - int

If your client does not support DELETE HTTP requests you can add an optional attribute _METHOD and set its value to DELETE.

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{
    "message": "Event forwarding cancelled."
}