Accessing item via rest API via myopenhab

Apps & Services myopenHAB
1

Hi all,

to be able to render the location map (https://github.com/openhab/openhab/wiki/GoogleMap) also from remote in the native application I tried to access the location values via rest using https://user:password@my.openhab.org/rest … in the html; but it fails - I assume my.openHAB does not allow CORS (cross domain calls):

XMLHttpRequest cannot load https://my.openhab.org/rest/items/PatrikLocation/state/. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://haus:8080' is therefore not allowed access. The response had HTTP status code 401.

Would it make sense to enable such requests, or is this too much of a security risk? Is there another way I can make the map work in the native apps (unfortunately there’s no location widget)?

with kind regards,
Patrik

2

That is correct

I’d have to think about it but my first inclination is this would be a pretty big security risk if not done really well. Jetty may not support it also, which would be technical challenge.

3

It seems that myopenhab doesn’t support CORS neither.

Using this code:

var request = $.ajax
        ({
            type       : "POST",
            url        :  "https://mail%40mail.be:password@home.myopenhab.org/rest/items/Z1_001_Heater",
            data       : "ON",
            contentType: 'text/plain',
            headers    : { 'Access-Control-Allow-Origin':'*' }
        });

I get following error:

No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

Do you know how to bypass this? When posting the request using Postman I have no problem at all but I must say I am not familiar with CORS yet.

4

Is there a solution to the issue?

5

I was also interessted into this use case and tested it. For me it worked fine to access openHAB via REST via myopenhab.

I tried two use cases:

  1. Get the state of an item
  2. Set the state of an item

Two ways of connection I tried:

My system setup:

  • openhabian on an Raspberry Pi connected via LAN
  • openhabian connected via openHAB cloud connector to the myopenhab cloud
  • I have one Thing with one Item (switch) set up via the Modbus binding
  • For testing REST I’m using the Mac App “Insomnia Core” (https://insomnia.rest/download/#mac)

My Insomnia Core setup for GET STATE:

My Insomnia Core setup for POST STATE:

6

This setup doesn’t work for me. Does anyone have any idea how I can access the REST api via myopenhab?

<html>
    <head>
        <script src="https://code.jquery.com/jquery-latest.min.js"></script>
    </head>
    <body>  
        <button id="ajax">ajax call</button>
        <script type="text/javascript">
            $('#ajax').click(function(){         
                $.ajax({ 
                     type: "GET",
                     username: "xxx@xxx.com", 
                     password: "xxx",
                     url: "https://myopenhab.org:443/rest/items/Test_Item/state",
                     success: function(data){        
                         console.log(data); 
                     },             
                 });
             });
        </script>
    </body>
</html>

I get the same error as described in the first post. Is there any other way to access items from “outside”?