functions/SPClientFile/Get-SPClientFile.ps1

#Requires -Version 3.0

# Get-SPClientFile.ps1
#
# Copyright (c) 2017 karamem0
#
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# SOFTWARE.

<#
.SYNOPSIS
  Gets one or more files.
.DESCRIPTION
  The Get-SPClientFile function lists all files or retrieve the specified file.
  If not specified filterable parameter, returns all files in the folder.
  Otherwise, returns a file which matches the parameter.
.PARAMETER ClientContext
  Indicates the client context. If not specified, uses default context.
.PARAMETER ParentFolder
  Indicates the folder which the files are contained.
.PARAMETER ParentWeb
  Indicates the web which the files are contained.
.PARAMETER Name
  Indicates the file name including the extension.
.PARAMETER Identity
  Indicates the file GUID.
.PARAMETER Url
  Indicates the file URL.
.PARAMETER Retrievals
  Indicates the data retrieval expression.
.EXAMPLE
  Get-SPClientFile $folder
.EXAMPLE
  Get-SPClientFile $folder -Name "CustomFile.xlsx"
.EXAMPLE
  Get-SPClientFile $web -Identity "185C6C6E-7E79-4C80-88D8-7392B4CA47CB"
.EXAMPLE
  Get-SPClientFile $web -Url "http://example.com/DocLib1/CustomFile.xlsx"
.EXAMPLE
  Get-SPClientFile $folder -Retrievals "ServerRelativeUrl"
#>


function Get-SPClientFile {

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

    process {
        if ($ClientContext -eq $null) {
            throw "Cannot bind argument to parameter 'ClientContext' because it is null."
        }
        if ($PSCmdlet.ParameterSetName -eq 'All') {
            $ClientObjectCollection = $ParentFolder.Files
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObjectCollection `
                -Retrievals $Retrievals
            Write-Output @(, $ClientObjectCollection)
        }
        if ($PSCmdlet.ParameterSetName -eq 'Identity') {
            $PathMethod = New-Object Microsoft.SharePoint.Client.ObjectPathMethod( `
                $ClientContext, `
                $ParentWeb.Path, `
                'GetFileById', `
                [object[]]$Identity)
            $ClientObject = New-Object Microsoft.SharePoint.Client.File($ClientContext, $PathMethod)
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObject `
                -Retrievals $Retrievals
            Write-Output $ClientObject
            trap {
                throw 'The specified file could not be found.'
            }
        }
        if ($PSCmdlet.ParameterSetName -eq 'Name') {
            $ClientObjectCollection = $ParentFolder.Files
            $PathMethod = New-Object Microsoft.SharePoint.Client.ObjectPathMethod( `
                $ClientContext, `
                $ClientObjectCollection.Path, `
                'GetByUrl', `
                [object[]]$Name)
            $ClientObject = New-Object Microsoft.SharePoint.Client.File($ClientContext, $PathMethod)
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObject `
                -Retrievals $Retrievals
            Write-Output $ClientObject
            trap {
                throw 'The specified file could not be found.'
            }
        }
        if ($PSCmdlet.ParameterSetName -eq 'Url') {
            $PathMethod = New-Object Microsoft.SharePoint.Client.ObjectPathMethod( `
                $ClientContext, `
                $ParentWeb.Path, `
                'GetFileByServerRelativeUrl', `
                [object[]]$Url)
            $ClientObject = New-Object Microsoft.SharePoint.Client.File($ClientContext, $PathMethod)
            Invoke-SPClientLoadQuery `
                -ClientContext $ClientContext `
                -ClientObject $ClientObject `
                -Retrievals $Retrievals
            Write-Output $ClientObject
            trap {
                throw 'The specified file could not be found.'
            }
        }
    }

}