functions/Get-WUGDeviceCredential.ps1

<#
.SYNOPSIS
Retrieves credentials assigned to a device in WhatsUp Gold.
 
.DESCRIPTION
The Get-WUGDeviceCredential function retrieves credential assignments for a device using the REST API:
- List all assigned credentials: GET /api/v1/devices/{deviceId}/credentials/-
- Get a specific credential assignment: GET /api/v1/devices/{deviceId}/credentials/{credentialId}
 
.PARAMETER DeviceId
The ID of the device. Required.
 
.PARAMETER CredentialId
The ID of a specific credential to retrieve. Used with the ByCredentialId parameter set.
 
.PARAMETER View
Level of credential information to return. Valid values: id, basic, summary, details. Default: basic.
 
.PARAMETER Type
Filter by credential type. Valid values: all, snmp, windows, ado, telnet, ssh, vmware, jmx, smis, aws, azure, meraki, restapi, ubiquiti, redfish. Default: all.
 
.EXAMPLE
# Get all credentials assigned to a device
Get-WUGDeviceCredential -DeviceId "123"
 
.EXAMPLE
# Get a specific assigned credential
Get-WUGDeviceCredential -DeviceId "123" -CredentialId "abc-456"
 
.EXAMPLE
# Get only SNMP credentials for a device
Get-WUGDeviceCredential -DeviceId "123" -Type snmp
 
.NOTES
Author: Jason Alberino (jason@wug.ninja)
Reference: https://docs.ipswitch.com/NM/WhatsUpGold2024/02_Guides/rest_api/index.html#tag/Device
#>

function Get-WUGDeviceCredential {
    [CmdletBinding(DefaultParameterSetName = 'ListCredentials')]
    param(
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, ValueFromPipelineByPropertyName = $true)]
        [Alias('id')]
        [string]$DeviceId,

        [Parameter(Mandatory = $true, ParameterSetName = 'ByCredentialId')]
        [string]$CredentialId,

        [Parameter(ParameterSetName = 'ListCredentials')]
        [Parameter(ParameterSetName = 'ByCredentialId')]
        [ValidateSet('id', 'basic', 'summary', 'details')]
        [string]$View = 'basic',

        [Parameter(ParameterSetName = 'ListCredentials')]
        [ValidateSet('all', 'snmp', 'windows', 'ado', 'telnet', 'ssh', 'vmware', 'jmx', 'smis', 'aws', 'azure', 'meraki', 'restapi', 'ubiquiti', 'redfish')]
        [string]$Type = 'all'
    )

    begin {
        Write-Debug "Starting Get-WUGDeviceCredential function. ParameterSet: $($PSCmdlet.ParameterSetName)"
        $baseUri = "${global:WhatsUpServerBaseURI}/api/v1/devices"
        $finalOutput = @()
    }

    process {
        switch ($PSCmdlet.ParameterSetName) {

            'ByCredentialId' {
                $queryParams = @()
                if ($View) { $queryParams += "view=$View" }
                $query = if ($queryParams.Count -gt 0) { "?" + ($queryParams -join "&") } else { "" }
                $uri = "${baseUri}/${DeviceId}/credentials/${CredentialId}${query}"

                Write-Debug "Fetching credential from URI: $uri"
                try {
                    $result = Get-WUGAPIResponse -Uri $uri -Method 'GET'
                    if ($result.data) { $finalOutput += $result.data }
                }
                catch {
                    Write-Error "Error fetching credential ${CredentialId} for device ${DeviceId}: $_"
                }
            }

            'ListCredentials' {
                $queryParams = @()
                if ($View) { $queryParams += "view=$View" }
                if ($Type -and $Type -ne 'all') { $queryParams += "type=$Type" }
                $query = if ($queryParams.Count -gt 0) { "?" + ($queryParams -join "&") } else { "" }
                $uri = "${baseUri}/${DeviceId}/credentials/-${query}"

                Write-Debug "Listing credentials from URI: $uri"
                try {
                    $result = Get-WUGAPIResponse -Uri $uri -Method 'GET'
                    if ($result.data) { $finalOutput += $result.data }
                }
                catch {
                    Write-Error "Error listing credentials for device ${DeviceId}: $_"
                }
            }
        }
    }

    end {
        Write-Debug "Completed Get-WUGDeviceCredential function. Total results: $($finalOutput.Count)"
        return $finalOutput
    }
}

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