Webhook payload runon Azure vs Hybrid worker

Ronald Foppen 5

I am working with azure automation, triggered by webhooks.

Typically this runs directly on Azure and works fine, the webhook data payload is received and handled as a PSCustomObject.

I now need to run the same on a Hybrid Worker because of a OnPrem requirement. When updating the webhook to run on a HW, and sending exactly the same payload, the web hook data is treated as a System.String.

This is obviously causing some challenges; I could look at parsing the string into individual elements again, but that is a PITA.

Any thoughts on why there is a difference on how the webhook data is treated? Or better, how to resolve it.

I've used the very simple example here: https://learn.microsoft.com/en-us/azure/automation/automation-webhooks?tabs=portal#use-a-webhook

1 answer

Stanislav Zhelyazkov 24,611 Reputation points MVP

2024-07-15T05:36:57.79+00:00

Hi,

I do not know why is different as I haven't used hybrid workers but the easiest way to solve it is to treat the input as json and convert it to PSObject (ConvertFrom-Json). In fact the example does that for the request body.

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Ronald Foppen 5 Reputation points

2024-07-15T15:26:08.5466667+00:00

Thanks for the suggestion; that's actually exactly the example I followed for my testing. I've added two webhooks, one running on Azure, the other one on a Hybrid Worker.

Sending the same JSON payload. Result is wildly different.

The Hybrid Worker one outputs the webhookdata as a System.String; which (obviously) won't work when doing the ConvertFrom-JSON

$Names = @( @{ Name="Hawaii"}, @{ Name="Seattle"}, @{ Name="Florida"} ) $body = ConvertTo-Json -InputObject $Names $testwebhookuriAZURE = "https://xxx.azure-automation.net/webhooks?token=xxx" $testwebhookuriHW = "https://xxx.azure-automation.net/webhooks?token=xxxx" Invoke-RestMethod -Method POST -Uri $testwebhookuriAZURE -Body $body Invoke-RestMethod -Method POST -Uri $testwebhookuriHW -Body $body

Running on Azure outputs as PSCustomobject, and everything works as expected

Stanislav Zhelyazkov 24,611 Reputation points MVP

2024-07-16T05:38:37.53+00:00

ok. As I have mentioned I do not know why there is a difference as I do not use it but shouldn't converting it from JSON to PS object workaround the issue for hybrid workers?

Ronald Foppen 5 Reputation points

2024-07-16T08:36:18.4866667+00:00

The data is when using the Hybrid Works is not valid a JSON; hence nothing to (easily) convert.

I am now experimenting with regex removing the parts I do not need, leaving only the requestbody in a format which I can do a ConvertFrom-Json

Main point still remains why the data becomes a string on the HW instead of staying a psobject

Anyways, thanks for thinking along!

{WebhookName:onpremhook,RequestBody:[\r\n {\r\n "Name": "Hawaii"\r\n },\r\n {\r\n "Name": "Seattle"\r\n },\r\n {\r\n "Name": "Florida"\r\n }\r\n],RequestHeader:{Accept-Encoding:gzip,Host:1f7b5302-3e30-4141-972a-91d03321e62d.webhook.eus.azure-automation.net,User-Agent:Mozilla/5.0,x-ms-request-id:7cadfc0f-5b36-47fd-bca4-470a3aad2567}}

Jan Wrage 5 Reputation points

2024-10-05T14:41:10.39+00:00

Hi!

I have excatly the same problem.

Have you found an easy solution for this bug?

Thanks, Jan

Jan Wrage 5 Reputation points

2024-10-05T14:54:20.6633333+00:00

Just found this:

https://learn.microsoft.com/en-us/azure/automation/automation-webhooks?tabs=portal#create-a-webhook

When you use the webhook with PowerShell 7 runbook, it auto-converts the webhook input parameter to an invalid JSON. For more information, see Known issues - PowerShell 7.1 (preview). We recommend that you use the webhook with PowerShell 5 runbook.

However, I'm using PS 7.2 and this limitation is not listed there...
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Webhook payload runon Azure vs Hybrid worker

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