Public/DirectorySchema/Get-R1DirectoryAttribute.ps1

# .ExternalHelp psRadiantOne-help.xml
function Get-R1DirectoryAttribute {
    [CmdletBinding(DefaultParameterSetName = 'All')]
    [OutputType('psRadiantOne.DirectorySchemaAttribute')]
    param(
        [parameter(
            Mandatory = $true,
            ValueFromPipelineByPropertyName = $true,
            ParameterSetName = 'Attribute'
        )]
        [ValidateLength(1, 500)]
        [string]$attribute,

        [parameter(
            Mandatory = $false,
            ParameterSetName = 'All'
        )]
        [bool]$includeAllProperties,

        [parameter(
            Mandatory = $false,
            ParameterSetName = 'All'
        )]
        [bool]$includeSuperior,

        [parameter(
            Mandatory = $false,
            ParameterSetName = 'All'
        )]
        [bool]$isUserDefined,

        [parameter(
            Mandatory = $false,
            ParameterSetName = 'All'
        )]
        [string[]]$attributeObjectClasses
    )

    Begin {

        Assert-R1Session -RequireToken

    }#begin

    Process {

        if ($PSCmdlet.ParameterSetName -eq 'Attribute') {

            $URI = Resolve-R1ServiceUrl -Service Schema -Path "attributes/$($attribute | Get-EscapedString)"

            $Result = Invoke-R1RestMethod -Uri $URI -Method GET

            if ($null -ne $Result) {

                $Result | Add-CustomType -Type psRadiantOne.DirectorySchemaAttribute

            }

        } else {

            $Query = $PSBoundParameters | Get-Parameter

            #The API expects the lowercase JSON spelling of a boolean, not PowerShell's
            foreach ($Flag in 'includeAllProperties', 'includeSuperior', 'isUserDefined') {

                if ($Query.ContainsKey($Flag)) {

                    $Query[$Flag] = "$($Query[$Flag])".ToLowerInvariant()

                }

            }

            $Path = 'attributes'

            $QueryString = $Query | ConvertTo-QueryString

            if (-not ([string]::IsNullOrEmpty($QueryString))) {

                $Path = "$Path`?$QueryString"

            }

            $URI = Resolve-R1ServiceUrl -Service Schema -Path $Path

            $Result = Invoke-R1RestMethod -Uri $URI -Method GET

            if ($null -ne $Result) {

                #meta reports which form the collection takes: the full attributes, or just their names
                if ($Result.meta) {

                    $Result.attributes | Add-CustomType -Type psRadiantOne.DirectorySchemaAttribute

                } else {

                    $Result.attributes

                }

            }

        }

    }#process

    End { }#end

}