functions/roleManagement/roleDefinitions/Test-AzurePIMroleDefinition.ps1

function Test-AzurePIMroleDefinition {
    <#
        .SYNOPSIS
            Test desired configuration against a Tenant.
        .DESCRIPTION
            Compare current configuration of a resource type with the desired configuration.
            Return a result object with the required changes and actions.
    #>

    [CmdletBinding()]
    Param (
        [System.Management.Automation.PSCmdlet]
        $Cmdlet = $PSCmdlet
    )

    begin
    {
        $resourceName = "roleDefinitions"
        Test-AzureConnection
        $token = (Get-AzAccessToken -ResourceUrl $script:apiBaseUrl).Token
        $tenant = Get-AzTenant -TenantId (Get-AzContext).Tenant.Id
    }
    process 
    {
        $definitions = $script:desiredConfiguration[$resourceName]

        foreach ($definition in $definitions) {
            foreach ($property in $definition.Properties()) {
                if ($definition.$property.GetType().Name -eq "String") {
                    $definition.$property = Resolve-String -Text $definition.$property
                }
            }

            $result = @{
                Tenant = $tenant.Name
                TenantId = $tenant.Id
                ResourceType = 'roleDefinition'
                ResourceName = $definition.roleName
                DesiredConfiguration = $definition
            }


            foreach ($entry in $definition.assignableScopes) {
                switch (($entry.ToCharArray() | Where-Object {$_ -eq '/'}).count) {
                    2 {Get-AzSubscription -SubscriptionId $entry.Split("/")[-1] | Out-Null}
                    4 {Get-AzResourceGroup -Name $entry.split("/")[-1] | Out-Null}
                    6 {Get-AzResource -Name $entry.split("/")[-1] | Out-Null}
                    default {
                        Write-PSFMessage -Level Warning -String 'AzurePIM.Test.RelatedResourceResolveError' -StringValues "assignableScope", $result.ResourceType, $result.ResourceName  -Tag 'failed'
                        $exception = New-Object System.Data.DataException("Cannot resolve assignableScope $($entry)")
                        $errorID = 'RelatedResourceResolveError'
                        $category = [System.Management.Automation.ErrorCategory]::NotSpecified
                        $recordObject = New-Object System.Management.Automation.ErrorRecord($exception, $errorID, $category, $Cmdlet)
                        $cmdlet.ThrowTerminatingError($recordObject)
                    }
                }
            }

            $subscriptionId = Resolve-Subscription -InputReference $definition.subscriptionReference
            $resource = (Invoke-RestMethod -Method GET -Uri "$($script:apiBaseUrl)$($subscriptionId.trimStart("/"))/providers/Microsoft.Authorization/roleDefinitions?api-version=2018-01-01-preview&`$filter=roleName eq '$($definition.roleName)'" -Headers @{"Authorization"="Bearer $($token)"}).value

            switch ($resource.count) {
                0 {
                    if ($definition.present) {                    
                        $result = New-TestResult @result -ActionType "Create"
                    }
                    else {                    
                        $result = New-TestResult @result -ActionType "NoActionRequired"
                    }
                }

                1 {
                    $result["AzureResource"] = $resource

                    if ($resource.properties.type -eq "BuiltInRole") {
                        Write-PSFMessage -Level Warning -String 'AzurePIM.Test.BuiltInRoleDetected' -StringValues $definition.roleName -Tag 'failed'
                        $exception = New-Object System.Data.DataException("BuiltInRole detected.")
                        $errorID = 'BuiltInRoleDetected'
                        $category = [System.Management.Automation.ErrorCategory]::NotSpecified
                        $recordObject = New-Object System.Management.Automation.ErrorRecord($exception, $errorID, $category, $Cmdlet)
                        $cmdlet.ThrowTerminatingError($recordObject)
                    }

                    if ($definition.present) {
                        $changes = @()
                        foreach ($property in ($definition.Properties() | Where-Object {$_ -notin "present","subscriptionReference","sourceConfig"})) {
                            $change = [PSCustomObject] @{
                                Property = $property                                        
                                Actions = $null
                            }

                            switch ($property) {
                                "permissions" {
                                    foreach ($item in ($definition.permissions | Get-Member -Type "NoteProperty").Name) {
                                        if ($definition.permissions.$item -and $resource.properties.permissions.$item) {
                                            if (Compare-Object -ReferenceObject $definition.permissions.$item -DifferenceObject $resource.properties.permissions.$item) {
                                                $change.Actions = @{"Set" = $definition.$property}
                                            }
                                        }
                                        if (($definition.permissions.$item -and (-not ($resource.properties.permissions.$item))) -or ((-not ($definition.permissions.$item)) -and ($resource.properties.permissions.$item))) {
                                            $change.Actions = @{"Set" = $definition.$property}
                                        }
                                    }
                                }
                                "assignableScopes" {
                                    if (Compare-Object -ReferenceObject $definition.$property -DifferenceObject $resource.properties.$property) {
                                        $change.Actions = @{"Set" = $definition.$property}
                                    }
                                }
                                default {
                                    if ($definition.$property -ne $resource.properties.$property) {
                                        $change.Actions = @{"Set" = $definition.$property}
                                    }
                                }
                            }

                            if ($change.Actions) {$changes += $change}
                        }

                        if ($changes.count -gt 0) { $result = New-TestResult @result -Changes $changes -ActionType "Update"}
                        else { $result = New-TestResult @result -ActionType "NoActionRequired" }
                    }
                    else {
                        if ($resource.properties.type -eq "BuiltInRole") {
                            Write-PSFMessage -Level Warning -String 'AzurePIM.Test.BuiltInRoleDetected' -StringValues $definition.roleName -Tag 'failed'
                            $exception = New-Object System.Data.DataException("BuiltInRole detected.")
                            $errorID = 'BuiltInRoleDetected'
                            $category = [System.Management.Automation.ErrorCategory]::NotSpecified
                            $recordObject = New-Object System.Management.Automation.ErrorRecord($exception, $errorID, $category, $Cmdlet)
                            $cmdlet.ThrowTerminatingError($recordObject)
                        }
                        $result = New-TestResult @result -ActionType "Delete"
                    }
                }
                default {
                    Write-PSFMessage -Level Warning -String 'AzurePIM.Test.MultipleResourcesError' -StringValues $resourceName, $definition.roleName -Tag 'failed'
                    $exception = New-Object System.Data.DataException("Query returned multiple results. Cannot decide which resource to test.")
                    $errorID = 'MultipleResourcesError'
                    $category = [System.Management.Automation.ErrorCategory]::NotSpecified
                    $recordObject = New-Object System.Management.Automation.ErrorRecord($exception, $errorID, $category, $Cmdlet)
                    $cmdlet.ThrowTerminatingError($recordObject)
                }
            }
            $result
        }
    }
}