Save JPEG URL into item image

Setup, Configuration and Use Scripts & Rules
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1

Hi Community,

I’m trying to get a JPEG from an URL into an item type image and I’m not able to find the correct way to perform this.
I was thinking that this is quite standard but looks like it is not.

I receive for example the following if I try to postUpdate the URL into the image item.

Cannot convert 'http://<picture-url>' to a state type which item 'pic_jpeg' accepts: [RawType, UnDefType]

Looks like I have to convert the data in base64 or so before but any idea how to perform this?

Best regards
Timmi

2

Which scripting language? RulesDSL?
If RulesDSL, you’ll need to grab the image using HTTP action first. If you need further help let us know.

In jruby:

Image_Item.update_from_url "http://<picture-url>"
3

this is a good question.
I use the old fashion rule files.
I guess this is the RulesDS, right.

Any help is really welcome. :wink:

4 
import java.net.URL

rule "test1"
when
  // Time cron '* * * * * *'
then
  val imageUrl = "https://www.openhab.org/demo/openhab-logo-square.png"

  val url = new URL(imageUrl)
  val connection = url.openConnection()
  val contentType = connection.getContentType()
  val bytes = connection.getInputStream().readAllBytes()
  val image = new RawType(bytes, contentType)
  TestImage.postUpdate(image)
end
1 Like
5

Yes this might work. The only issue might be that I need to authenticate with the server. It is a basic authentication and it is not working if I just write user:password inside the URL.

Thank you already so much

6

I’m just googling this stuff :slight_smile:

import java.net.URL
import java.util.Base64

rule "test1"
when
  // Time cron '* * * * * *'
then
  val imageUrl = "https://www.openhab.org/demo/openhab-logo-square.png"
  val username = "username"
  val password = "12345"

  val url = new URL(imageUrl)
  val connection = url.openConnection()

  val userpass = username + ":" + password
  val basicAuth = "Basic " + new String(Base64.getEncoder().encode(userpass.getBytes()))
  connection.setRequestProperty("Authorization", basicAuth)

  val contentType = connection.getContentType()
  val bytes = connection.getInputStream().readAllBytes()
  val image = new RawType(bytes, contentType)
  TestImage.postUpdate(image)
end
1 Like
7

Thank you very much for your google help. :wink:

Best regards
Timmi