Netbox secrets with PowerShell - powershell

Question

I am trying to access secrets in Netbox like in this example
https://netbox.readthedocs.io/en/latest/api/working-with-secrets/
but using Powershell but I seem to have hit a brick wall.
Here is my code:
Add-Type -AssemblyName System.Web
$Hdrs = #{}
$Hdrs.Add("Authorization","Token fafcaea339cf926c0d79tokenf916aeec2d18bdd")
$Hdrs.Add("Accept","application/json; indent=4")
$body = Get-Content 'c:\key\private.txt'
$body = [System.Web.HttpUtility]::UrlEncode($body)
Invoke-RestMethod -Method post -Uri "http://netbox.et/api/secrets/get-session-key/" -Headers $Hdrs -body $body
I just get the error
Invoke-RestMethod : Private key was not provided.
I'm pretty sure the issue is with how I am forming the request, however, I don't know enough about curl to know what '--data' do and how that would look in Powershell. Any help would be most appreciated.

Answer 1

OK, there were multiple issues. The first that I need to pass the private key as an object with two clear fields like I am the header and the other was I had URL encoded it by defining it in the header and then used a function to URL encode it again, which in turn made the private key invalid.
This is the solution
Add-Type -AssemblyName System.Web
$Hdrs = #{}
$body = #{}
$Hdrs.Add("Authorization","Token fafcaea339cf926c0d7977e3ff916aeec2d18bdd")
$Hdrs.Add("Accept","application/json; indent=4")
$Hdrs.Add("Content-Type","application/x-www-form-urlencoded")
$Pkey = Get-Content -raw 'c:\key\private.txt'
$body.add("private_key",$PKey)
Invoke-RestMethod -Method post -Uri "http://netbox.net/api/secrets/get-session-key/" -Headers $Hdrs -Body $body