functions/SPClientContentType/Get-SPClientContentType.ps1

#Requires -Version 3.0

# Get-SPClientContentType.ps1
#
# Copyright (c) 2017 karamem0
#
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function Get-SPClientContentType {

<#
.SYNOPSIS
  Gets one or more content types.
.DESCRIPTION
  The Get-SPClientContentType function lists all content types or retrieves the
  specified content type. If not specified filterable parameter, returns all
  content types of the web. Otherwise, returns a content type which matches the
  parameter.
.PARAMETER ClientContext
  Indicates the client context. If not specified, uses default context.
.PARAMETER ParentWeb
  Indicates the web which the content types are contained.
.PARAMETER Identity
  Indicates the content type ID.
.PARAMETER Name
  Indicates the content type name.
.PARAMETER Retrievals
  Indicates the data retrieval expression.
.EXAMPLE
  Get-SPClientContentType $web
.EXAMPLE
  Get-SPClientContentType $web -Identity "0X01009BD26CA6BE114008A9D56E68022DD1A7"
.EXAMPLE
  Get-SPClientContentType $web -Name "Custom Content Type"
.EXAMPLE
  Get-SPClientContentType $web -Retrievals "Title"
#>


    [CmdletBinding(DefaultParameterSetName = 'All')]
    param (
        [Parameter(Mandatory = $false, ParameterSetName = 'All')]
        [Parameter(Mandatory = $false, ParameterSetName = 'Identity')]
        [Parameter(Mandatory = $false, ParameterSetName = 'Name')]
        [Microsoft.SharePoint.Client.ClientContext]
        $ClientContext = $SPClient.ClientContext,
        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true)]
        [Microsoft.SharePoint.Client.Web]
        $ParentWeb,
        [Parameter(Mandatory = $true, ParameterSetName = 'Identity')]
        [Alias('Id')]
        [string]
        $Identity,
        [Parameter(Mandatory = $true, ParameterSetName = 'Name')]
        [string]
        $Name,
        [Parameter(Mandatory = $false)]
        [string]
        $Retrievals
    )

    process {
        if ($ClientContext -eq $null) {
            throw "Cannot bind argument to parameter 'ClientContext' because it is null."
        }
        $ClientObjectCollection = $ParentWeb.ContentTypes
        if ($PSCmdlet.ParameterSetName -eq 'All') {
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObjectCollection `
                -Retrievals $Retrievals
            Write-Output @(, $ClientObjectCollection)
        }
        if ($PSCmdlet.ParameterSetName -eq 'Identity') {
            $PathMethod = New-Object Microsoft.SharePoint.Client.ObjectPathMethod( `
                $ClientContext, `
                $ClientObjectCollection.Path, `
                'GetById', `
                [object[]]$Identity)
            $ClientObject = New-Object Microsoft.SharePoint.Client.ContentType($ClientContext, $PathMethod)
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObject `
                -Retrievals $Retrievals
            if ($ClientObject.Id -eq $null) {
                throw 'The specified content type could not be found.'
            }
            Write-Output $ClientObject
        }
        if ($PSCmdlet.ParameterSetName -eq 'Name') {
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObjectCollection `
                -Retrievals 'Include(Name)'
            $ClientObject = $ClientObjectCollection | Where-Object { $_.Name -eq $Name }
            if ($ClientObject -eq $null) {
                throw 'The specified content type could not be found.'
            }
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObject `
                -Retrievals $Retrievals
            Write-Output $ClientObject
        }
    }

}