internal/functions/resolve/Resolve-AccessPackageResource.ps1

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function Resolve-AccessPackageResource
{
    [CmdletBinding()]
    Param (
        [Parameter(Mandatory = $true)]
        [string] $InputReference,
        [Parameter(Mandatory = $true)]
        [string] $CatalogId,
        [switch] $DontFailIfNotExisting,
        [System.Management.Automation.PSCmdlet]
        $Cmdlet = $PSCmdlet
    )
    
    begin {
        $InputReference = Resolve-String -Text $InputReference
    }
    process
    {            
        try {
            if ($InputReference -match $script:guidRegex) {
                $resource = (Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/identityGovernance/entitlementManagement/accessPackageCatalogs/{0}/accessPackageResources?`$filter=originId eq '{1}'" -f $CatalogId, $InputReference)).Value
            }
            else {
                $resource = (Invoke-MgGraphRequest -Method GET -Uri ("$script:graphBaseUrl/identityGovernance/entitlementManagement/accessPackageCatalogs/{0}/accessPackageResources?`$filter=displayName eq '{1}'" -f $CatalogId, $InputReference)).Value
            }

            if (-Not $resource -and -Not $DontFailIfNotExisting){ throw "Cannot find accessPackageResource $InputReference" } 
            elseif (-Not $resource -and $DontFailIfNotExisting) { return }

            if ($resource.count -gt 1) { throw "Got multiple accessPackageResources for $InputReference" }
            return $resource.Id
        }
        catch {
            Write-PSFMessage -Level Warning -String 'TMF.CannotResolveResource' -StringValues "AccessPackageResource" -Tag 'failed' -ErrorRecord $_
            $Cmdlet.ThrowTerminatingError($_)                
        }            
    }
}